$schema: https://element-hq.github.io/synapse/latest/schema/v1/meta.schema.json
$id: https://element-hq.github.io/synapse/schema/synapse/v1.152/synapse-config.schema.json
type: object
properties:
  modules:
    type: array
    description: >-
      Use the `module` sub-option to add modules under this option to extend
      functionality. The `module` setting then has a sub-option, `config`, which
      can be used to define some configuration for the `module`.
    items:
      type: object
      properties:
        module:
          type: string
          description: Path to the Python class of the module.
        config:
          type: object
          description: Configuration options for the module.
    default: []
    examples:
      - - module: my_super_module.MySuperClass
          config:
            do_thing: true
        - module: my_other_super_module.SomeClass
          config: {}
  server_name:
    type: string
    description: >-
      This sets the public-facing domain of the server.


      The `server_name` name will appear at the end of usernames and room
      addresses created on your server. For example if the `server_name` was
      example.com, usernames on your server would be in the format
      `@user:example.com`.


      In most cases you should avoid using a matrix specific subdomain such as
      matrix.example.com or synapse.example.com as the `server_name` for the
      same reasons you wouldn't use user@email.example.com as your email
      address. See [here](../../delegate.md) for information on how to host
      Synapse on a subdomain while preserving a clean `server_name`.


      The `server_name` cannot be changed later so it is important to configure
      this correctly before you start Synapse. It should be all lowercase and
      may contain an explicit port.
    examples:
      - matrix.org
      - localhost:8080
  pid_file:
    type: ["string", "null"]
    description: When running Synapse as a daemon, the file to store the pid in.
    default: null
    examples:
      - DATADIR/homeserver.pid
  daemonize:
    type: boolean
    description: >-
      Specifies whether Synapse should be started as a daemon process. If
      Synapse is being managed by [systemd](../../systemd-with-workers/), this
      option must be omitted or set to `false`.


      This can also be set by the `--daemonize` (`-D`) argument when starting
      Synapse.


      See `worker_daemonize` for more information on daemonizing workers.
    default: false
    examples:
      - true
  print_pidfile:
    type: boolean
    description: >-
      Print the path to the pidfile just before daemonizing.


      This can also be set by the `--print-pidfile` argument when starting Synapse.
    default: false
    examples:
      - true
  user_agent_suffix:
    type: ["string", "null"]
    description: >-
      A suffix that is appended to the Synapse user-agent (ex. `Synapse/v1.123.0`).
    default: null
    examples:
      - " (I'm a teapot; Linux x86_64)"
  use_frozen_dicts:
    type: boolean
    description: >-
      Determines whether we should freeze the internal dict object in
      `FrozenEvent`. Freezing prevents bugs where we accidentally share e.g.
      signature dicts. However, freezing a dict is expensive.
    default: false
    examples:
      - true
  web_client_location:
    type: ["string", "null"]
    description: The absolute URL to the web client which `/` will redirect to.
    default: null
    examples:
      - "https://riot.example.com/"
  public_baseurl:
    type: ["string", "null"]
    description: >-
      The public-facing base URL that clients use to access this Homeserver (not
      including _matrix/...). This is the same URL a user might enter into the
      "Custom Homeserver URL" field on their client. If you use Synapse with a
      reverse proxy, this should be the URL to reach Synapse via the proxy.
      Otherwise, it should be the URL to reach Synapse's client HTTP listener
      (see [`listeners`](#listeners) below).


      If unset or null, `https://<server_name>/` is used.
    default: null
    examples:
      - "https://example.com/"
  serve_server_wellknown:
    type: boolean
    description: >-
      By default, other servers will try to reach our server on port 8448, which
      can be inconvenient in some environments.


      Provided `https://<server_name>/` on port 443 is routed to Synapse, this
      option configures Synapse to serve a file at
      `https://<server_name>/.well-known/matrix/server`. This will tell other
      servers to send traffic to port 443 instead.


      This option currently defaults to false.


      See [Delegation of incoming federation traffic](../../delegate.md) for
      more information.
    default: false
    examples:
      - true
  extra_well_known_client_content:
    type: object
    description: >-
      This option allows server runners to add arbitrary key-value pairs to the
      [client-facing `.well-known`
      response](https://spec.matrix.org/latest/client-server-api/#well-known-uri).
      Note that the `public_baseurl` config option must be provided for Synapse
      to serve a response to `/.well-known/matrix/client` at all.


      If this option is provided, it parses the given yaml to json and serves it
      on `/.well-known/matrix/client` endpoint alongside the standard
      properties.


      *Added in Synapse 1.62.0.*
    examples:
      - option1: value1
        option2: value2
  soft_file_limit:
    type: integer
    description: >-
      Set the soft limit on the number of file descriptors synapse can use. Zero
      is used to indicate synapse should set the soft limit to the hard limit.
    default: 0
    examples:
      - 3
  presence:
    type: object
    description: >-
      Presence tracking allows users to see the state (e.g online/offline) of
      other local and remote users. This option replaces the previous top-level
      `use_presence` option.
    properties:
      enabled:
        type: ["boolean", "string"]
        description: >-
          Set to false to disable presence tracking on this homeserver.


          Can also be set to a special value of "untracked" which ignores
          updates received via clients and federation, while still accepting
          updates from the [module API](../../modules/index.md).


          *The "untracked" option was added in Synapse 1.96.0.*
        oneOf:
          - type: boolean
          - type: string
            const: untracked
        default: true
      include_offline_users_on_sync:
        type: boolean
        description: >-
          When clients perform an initial or `full_state` sync, presence results
          for offline users are not included by default. Setting
          `include_offline_users_on_sync` to `true` will always include offline
          users in the results.
        default: false
    examples:
      - enabled: false
        include_offline_users_on_sync: false
  require_auth_for_profile_requests:
    type: boolean
    description: >-
      Whether to require authentication to retrieve profile data (avatars,
      display names) of other users through the client API. Note that profile
      data is also available via the federation API, unless
      `allow_profile_lookup_over_federation` is set to false.
    default: false
    examples:
      - true
  limit_profile_requests_to_users_who_share_rooms:
    type: boolean
    description: >-
      Use this option to require a user to share a room with another user in
      order to retrieve their profile information. Only checked on Client-Server
      requests. Profile requests from other servers should be checked by the
      requesting server.
    default: false
    examples:
      - true
  include_profile_data_on_invite:
    type: boolean
    description: >-
      Use this option to prevent a user's profile data from being retrieved and
      displayed in a room until they have joined it. By default, a user's
      profile data is included in an invite event, regardless of the values of
      the above two settings, and whether or not the users share a server.
    default: true
    examples:
      - false
  allow_public_rooms_without_auth:
    type: boolean
    description:
      If set to true, removes the need for authentication to access the server's
      public rooms directory through the client API, meaning that anyone can
      query the room directory.
    default: false
    examples:
      - true
  allow_public_rooms_over_federation:
    type: boolean
    description: >-
      If set to true, allows any other homeserver to fetch the server's public
      rooms directory via federation.
    default: false
    examples:
      - true
  default_room_version:
    type: string
    description: >-
      The default room version for newly created rooms on this server.


      Known room versions are listed
      [here](https://spec.matrix.org/latest/rooms/#complete-list-of-room-versions)


      For example, for room version 1, `default_room_version` should be set to
      "1".


      _Changed in Synapse 1.76:_ the default version room version was increased
      from [9](https://spec.matrix.org/v1.5/rooms/v9/) to
      [10](https://spec.matrix.org/v1.5/rooms/v10/).
    default: "10"
    examples:
      - "8"
  gc_thresholds:
    type: ["array", "null"]
    description: >-
      The garbage collection threshold parameters to pass to `gc.set_threshold`,
      if defined.
    default: null
    examples:
      - - 700
        - 10
        - 10
  gc_min_interval:
    type: array
    description: >-
      The minimum time in seconds between each GC for a generation, regardless
      of the GC thresholds. This ensures that we don't do GC too frequently. A
      value of `[1s, 10s, 30s]` indicates that a second must pass between
      consecutive generation 0 GCs, etc.
    default:
      - 1s
      - 10s
      - 30s
    examples:
      - - 0.5s
        - 30s
        - 1m
  filter_timeline_limit:
    type: integer
    description: >-
      Set the limit on the returned events in the timeline in the get and sync
      operations. A value of -1 means no upper limit.
    default: 100
    examples:
      - 5000
  block_non_admin_invites:
    type: boolean
    description: >-
      Whether room invites to users on this server should be blocked (except
      those sent by local server admins).
    default: false
    examples:
      - true
  enable_search:
    type: boolean
    description: >-
      If set to false, new messages will not be indexed for searching and users
      will receive errors when searching for messages.
    default: true
    examples:
      - false
  ip_range_blacklist:
    type: array
    description: >-
      This option prevents outgoing requests from being sent to the specified
      blacklisted IP address CIDR ranges. If this option is not specified then
      it defaults to private IP address ranges (see the example below).


      The blacklist applies to the outbound requests for federation, identity
      servers, push servers, and for checking key validity for third-party
      invite events.


      (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
      listed here, since they correspond to unroutable addresses.)


      This option replaces `federation_ip_range_blacklist` in Synapse v1.25.0.


      Note: The value is ignored when an HTTP proxy is in use.
    items:
      type: string
    default:
      - 127.0.0.0/8
      - 10.0.0.0/8
      - 172.16.0.0/12
      - 192.168.0.0/16
      - 100.64.0.0/10
      - 192.0.0.0/24
      - 169.254.0.0/16
      - 192.88.99.0/24
      - 198.18.0.0/15
      - 192.0.2.0/24
      - 198.51.100.0/24
      - 203.0.113.0/24
      - 224.0.0.0/4
      - "::1/128"
      - "fe80::/10"
      - "fc00::/7"
      - "2001:db8::/32"
      - "ff00::/8"
      - "fec0::/10"
  ip_range_whitelist:
    type: array
    description: >-
      List of IP address CIDR ranges that should be allowed for federation,
      identity servers, push servers, and for checking key validity for
      third-party invite events. This is useful for specifying exceptions to
      wide-ranging blacklisted target IP ranges – e.g. for communication with a
      push server only visible in your network.


      This whitelist overrides `ip_range_blacklist`.
    items:
      type: string
    default: []
    examples:
      - - 192.168.1.1
  listeners:
    type: array
    description: >-
      List of ports that Synapse should listen on, their purpose and their
      configuration.


      Valid resource names are:


      * `client`: the client-server API (/_matrix/client). Also implies `media`
      and `static`. If configuring the main process, the Synapse Admin API
      (/_synapse/admin) is also implied.


      * `consent`: user consent forms (/_matrix/consent). See
      [here](../../consent_tracking.md) for more.


      * `federation`: the server-server API (/_matrix/federation). Also implies
      `media`, `keys`, `openid`


      * `keys`: the key discovery API (/_matrix/key).


      * `media`: the media API (/_matrix/media).


      * `metrics`: the metrics interface. See [here](../../metrics-howto.md).
      (Not compatible with Unix sockets)


      * `openid`: OpenID authentication. See [here](../../openid.md).


      * `replication`: the HTTP replication API (/_synapse/replication). See
      [here](../../workers.md).


      * `static`: static resources under synapse/static (/_matrix/static).
      (Mostly useful for "fallback authentication".)


      * `health`: the [health check
      endpoint](../../reverse_proxy.md#health-check-endpoint). This endpoint is
      by default active for all other resources and does not have to be
      activated separately. This is only useful if you want to use the health
      endpoint explicitly on a dedicated port or for [workers](../../workers.md)
      and containers without listener e.g. [application
      services](../../workers.md#notifying-application-services).
    items:
      type: object
      properties:
        port:
          type: integer
          description: The TCP port to bind to.
        tag:
          type: ["string", "null"]
          description: >-
            An alias for the port in the logger name. If set the tag is logged
            instead of the port. Default to `None`, is optional and only valid
            for listener with `type: http`. See the docs [request log
            format](../administration/request_log.md).
        bind_addresses:
          type: ["array", "null"]
          description: >-
            A list of local addresses to listen on. The default is "all local
            interfaces".
          items:
            type: string
        type:
          type: string
          description: >-
            The type of listener. Normally `http`, but other valid options are
            [`manhole`](../../manhole.md) and
            [`metrics`](../../metrics-howto.md).
          enum:
            - http
            - manhole
            - metrics
        tls:
          type: boolean
          description: >-
            Set to true to enable TLS for this listener. Will use the TLS
            key/cert specified in tls_private_key_path/tls_certificate_path.
        x_forwarded:
          type: boolean
          description: >-
            Only valid for an `http` listener. Set to true to use the
            X-Forwarded-For header as the client IP. Useful when Synapse is
            behind a [reverse-proxy](../../reverse_proxy.md).
        request_id_header:
          type: ["string", "null"]
          description: >-
            The header extracted from each incoming request that is used as the
            basis for the request ID. The request ID is used in
            [logs](../administration/request_log.md#request-log-format) and
            tracing to correlate and match up requests. When unset, Synapse will
            automatically generate sequential request IDs. This option is useful
            when Synapse is behind a [reverse-proxy](../../reverse_proxy.md).


            _Added in Synapse 1.68.0._
        resources:
          type: array
          description: >-
            Only valid for an `http` listener. A list of resources to host on this port.
          items:
            type: object
            properties:
              names:
                type: array
                description: >-
                  A list of names of HTTP resources. See below for a list of
                  valid resource names.
                items:
                  type: string
                  enum:
                    - client
                    - consent
                    - federation
                    - keys
                    - media
                    - metrics
                    - openid
                    - replication
                    - static
                    - health
              compress:
                type: boolean
                description: >-
                  Set to true to enable gzip compression on HTTP bodies for this
                  resource. This is currently only supported with the `client`,
                  `consent`, `metrics` and `federation` resources.
        additional_resources:
          type: object
          description: >-
            Only valid for an `http` listener. A map of additional endpoints
            which should be loaded via dynamic modules.
          additionalProperties:
            type: object
            properties:
              module:
                type: string
              config:
                type: object
        path:
          type: string
          description: >-
            A path and filename for a Unix socket. Make sure it is located in a
            directory with read and write permissions, and that it already
            exists (the directory will not be created). Defaults to `None`.

            * **Note**: The use of both `path` and `port` options for the same
            `listener` is not compatible.

            * The `x_forwarded` option defaults to true  when using Unix sockets
            and can be omitted.

            * Other options that would not make sense to use with a UNIX socket,
            such as `bind_addresses` and `tls` will be ignored and can be
            removed.


            _Added in Synapse 1.89.0_: Unix socket support
        mode:
          type: ["integer", "null"]
          description: >-
            The file permissions to set on the UNIX socket. Defaults to `666` if
            unset or null.


            **Note:** Must be set as `type: http` (does not support `metrics`
            and `manhole`). Also make sure that `metrics` is not included in
            `resources` -> `names`


            _Added in Synapse 1.89.0_: Unix socket support
    default: []
    examples:
      - - port: 8448
          type: http
          tls: true
          resources:
            - names:
                - client
                - federation
      - - port: 8008
          tls: false
          type: http
          x_forwarded: true
          bind_addresses:
            - "::1"
            - 127.0.0.1
          resources:
            - names:
                - client
                - federation
              compress: false
          additional_resources:
            /_matrix/my/custom/endpoint:
              module: my_module.CustomRequestHandler
              config: {}
        - port: 9000
          bind_addresses:
            - "::1"
            - 127.0.0.1
          type: manhole
      - - path: /run/synapse/main_public.sock
          type: http
          resources:
            - names:
                - client
                - federation
  manhole:
    type: ["integer", "null"]
    description: >-
      Turn on the Twisted telnet manhole service on the given port.


      This can also be set by the `--manhole` argument when starting Synapse.
    default: null
    examples:
      - 1234
  manhole_settings:
    type: object
    description: >-
      Connection settings for the manhole. You can find more information on the
      manhole [here](../../manhole.md).
    properties:
      username:
        type: ["string", "null"]
        description: The username for the manhole. This defaults to "matrix".
      password:
        type: ["string", "null"]
        description: The password for the manhole. This defaults to "rabbithole".
      ssh_priv_key_path:
        type: ["string", "null"]
        description: >-
          The private SSH key used to encrypt the manhole traffic. If left
          unset, then hardcoded and non-secret keys are used, which could allow
          traffic to be intercepted if sent over a public network.
      ssh_pub_key_path:
        type: ["string", "null"]
        description: >-
          The public SSH key corresponsing to `ssh_priv_key_path`. If left
          unset, a hardcoded key is used.
    examples:
      - username: manhole
        password: mypassword
        ssh_priv_key_path: CONFDIR/id_rsa
        ssh_pub_key_path: CONFDIR/id_rsa.pub
  http_proxy:
    type: ["string", "null"]
    description: >-
      Proxy server to use for HTTP requests.

      For more details, see the [forward proxy documentation](../../setup/forward_proxy.md).
    examples:
      - "http://USERNAME:PASSWORD@10.0.1.1:8080/"
  https_proxy:
    type: ["string", "null"]
    description: >-
      Proxy server to use for HTTPS requests.

      For more details, see the [forward proxy documentation](../../setup/forward_proxy.md).
    examples:
      - "http://USERNAME:PASSWORD@proxy.example.com:8080/"
  no_proxy_hosts:
    type: array
    description: >-
      List of hosts, IP addresses, or IP ranges in CIDR format which should not use the
      proxy. Synapse will directly connect to these hosts.

      For more details, see the [forward proxy documentation](../../setup/forward_proxy.md).
    examples:
      - - master.hostname.example.com
        - 10.1.0.0/16
        - 172.30.0.0/16
  matrix_authentication_service:
    type: object
    description: >-
      The `matrix_authentication_service` setting configures integration with
      [Matrix Authentication Service (MAS)](https://github.com/element-hq/matrix-authentication-service).
    properties:
      enabled:
        type: boolean
        description: >-
          Whether or not to enable the MAS integration. If this is set to
          `false`, Synapse will use its legacy internal authentication API.
        default: false

      endpoint:
        type: string
        format: uri
        description: >-
          The URL where Synapse can reach MAS. This *must* have the `discovery`
          and `oauth` resources mounted.
        default: http://localhost:8080

      force_http2:
        type: boolean
        description: >-
          Force HTTP/2 over plaintext (H2C) when connecting to MAS. MAS supports
          this natively, but a reverse proxy between Synapse and MAS may not.
        default: false

      secret:
        type: ["string", "null"]
        description: >-
          A shared secret that will be used to authenticate requests from and to MAS.

      secret_path:
        type: ["string", "null"]
        description: >-
          Alternative to `secret`, reading the shared secret from a file.
          The file should be a plain text file, containing only the secret.
          Synapse reads the secret from the given file once at startup.

    examples:
      - enabled: true
        secret: someverysecuresecret
        endpoint: http://localhost:8080
  dummy_events_threshold:
    type: integer
    description: >-
      Forward extremities can build up in a room due to networking delays
      between homeservers. Once this happens in a large room, calculation of the
      state of that room can become quite expensive. To mitigate this, once the
      number of forward extremities reaches a given threshold, Synapse will send
      an `org.matrix.dummy_event` event, which will reduce the forward
      extremities in the room.


      This setting defines the threshold (i.e. number of forward extremities in
      the room) at which dummy events are sent.
    default: 10
    examples:
      - 5
  delete_stale_devices_after:
    oneOf:
      - $ref: "#/$defs/duration"
      - type: "null"
    description: >-
      An optional duration. If set, Synapse will run a daily background task to
      log out and delete any device that hasn't been accessed for more than the
      specified amount of time.


      A value of null means devices are never pruned.


      **Note:** This task will always run on the main process, regardless of the
      value of `run_background_tasks_on`. This is due to workers currently not
      having the ability to delete devices.
    default: null
    examples:
      - 1y
  email:
    type: object
    description: >-
      Configuration for sending emails from Synapse.


      Server admins can configure custom templates for email content. See
      [here](../../templates.md) for more information.
    properties:
      smtp_host:
        type: string
        description: The hostname of the outgoing SMTP server to use.
        default: localhost
      smtp_port:
        type: ["string", "null"]
        description: >-
          The port on the mail server for outgoing SMTP. If null or unset, 465
          is used if `force_tls` is true, else 25.


          _Changed in Synapse 1.64.0:_ the default port is now aware of
          `force_tls`.
        default: null
      smtp_user:
        type: ["string", "null"]
        description: Username for authentication to the SMTP server.
        default: null
      smtp_pass:
        type: ["string", "null"]
        description: Password for authentication to the SMTP server.
        default: null
      force_tls:
        type: boolean
        description: >-
          By default, Synapse connects over plain text and then optionally
          upgrades to TLS via STARTTLS. If this option is set to true, TLS is
          used from the start (Implicit TLS), and the option
          `require_transport_security` is ignored. It is recommended to enable
          this if supported by your mail server.


          _New in Synapse 1.64.0._
        default: false
      require_transport_security:
        type: boolean
        description: >-
          Set to true to require TLS transport security for SMTP. By default,
          Synapse will connect over plain text, and will then switch to TLS via
          STARTTLS *if the SMTP server supports it*. If this option is set,
          Synapse will refuse to connect unless the server supports STARTTLS.
        default: false
      enable_tls:
        type: boolean
        description: >-
          By default, if the server supports TLS, it will be used, and the
          server must present a certificate that is valid for `tlsname`. If this
          option is set to false, TLS will not be used.
        default: true
      tlsname:
        type: string
        description: >-
          The domain name the SMTP server's TLS certificate must be valid for,
          defaulting to `smtp_host`.
      notif_from:
        type: ["string", "null"]
        description: >-
          Defines the "From" address to use when sending emails. It must be set
          if email sending is enabled. The placeholder `%(app)s` will be
          replaced by the application name, which is normally set in `app_name`,
          but may be overridden by the Matrix client application. Note that the
          placeholder must be written `%(app)s`, including the trailing 's'.
        default: null
      app_name:
        type: string
        description: >-
          Defines the default value for `%(app)s` in `notif_from` and email subjects.
        default: Matrix
      enable_notifs:
        type: boolean
        description: >-
          Set to true to allow users to receive e-mail notifications. If this is
          not set, users can configure e-mail notifications but will not receive
          them.
        default: false
      notif_for_new_users:
        type: boolean
        description: >-
          Set to false to disable automatic subscription to email notifications
          for new users.
        default: true
      notif_delay_before_mail:
        $ref: "#/$defs/duration"
        description: >-
          The time to wait before emailing about a notification. This gives the
          user a chance to view the message via push or an open client.


          _New in Synapse 1.99.0._
        default: 10m
      client_base_url:
        type: string
        description: >-
          Custom URL for client links within the email notifications. (This
          setting used to be called `riot_base_url`; the old name is still
          supported for backwards-compatibility but is now deprecated.)
        default: "https://matrix.to"
      validation_token_lifetime:
        $ref: "#/$defs/duration"
        description: >-
          Configures the time that a validation email will expire after sending.
        default: 1h
      invite_client_location:
        type: ["string", "null"]
        description: >-
          The web client location to direct users to during an invite. This is
          passed to the identity server as the `org.matrix.web_client_location`
          key. If null or unset no guidance is given to the identity server.
        default: null
      subjects:
        type: object
        description: >-
          Subjects to use when sending emails from Synapse. The placeholder
          `%(app)s` will be replaced with the value of the `app_name` setting,
          or by a value dictated by the Matrix client application. In addition,
          each subject can use the following placeholders: `%(person)s`, which
          will be replaced by the displayname of the user(s) that sent the
          message(s), e.g. "Alice and Bob", and `%(room)s`, which will be
          replaced by the name of the room the message(s) have been sent to,
          e.g. "My super room". In addition, emails related to account
          administration will can use the `%(server_name)s` placeholder, which
          will be replaced by the value of the `server_name` setting in your
          Synapse configuration.
        properties:
          message_from_person_in_room:
            type: string
            description: >-
              Subject to use to notify about one message from one or more
              user(s) in a room which has a name.
            default: >-
              [%(app)s] You have a message on %(app)s from %(person)s in the
              %(room)s room...
          message_from_person:
            type: string
            description: >-
              Subject to use to notify about one message from one or more
              user(s) in a room which doesn't have a name.
            default: "[%(app)s] You have a message on %(app)s from %(person)s..."
          messages_from_person:
            type: string
            description: >-
              Subject to use to notify about multiple messages from one or more
              users in a room which doesn't have a name.
            default: "[%(app)s] You have messages on %(app)s from %(person)s..."
          messages_in_room:
            type: string
            description: >-
              Subject to use to notify about multiple messages in a room which
              has a name.
            default: "[%(app)s] You have messages on %(app)s in the %(room)s room..."
          messages_in_room_and_others:
            type: string
            description: >-
              Subject to use to notify about multiple messages in multiple rooms.
            default: >-
              [%(app)s] You have messages on %(app)s in the %(room)s room and others...
          messages_from_person_and_others:
            type: string
            description: >-
              Subject to use to notify about multiple messages from multiple
              persons in multiple rooms. This is similar to the setting above
              except it's used when the room in which the notification was
              triggered has no name.
            default: >-
              [%(app)s] You have messages on %(app)s from %(person)s and others...
          invite_from_person_to_room:
            type: string
            description: >-
              Subject to use to notify about an invite to a room which has a name.
            default: >-
              [%(app)s] %(person)s has invited you to join the %(room)s room on
              %(app)s...
          invite_from_person:
            type: string
            description: >-
              Subject to use to notify about an invite to a room which doesn't
              have a name.
            default: "[%(app)s] %(person)s has invited you to chat on %(app)s..."
          password_reset:
            type: string
            description: Subject to use when sending a password reset email.
            default: "[%(server_name)s] Password reset"
          email_validation:
            type: string
            description: >-
              Subject to use when sending a verification email to assert an
              address's ownership.
            default: "[%(server_name)s] Validate your email"
    examples:
      - smtp_host: mail.server
        smtp_port: 587
        smtp_user: exampleusername
        smtp_pass: examplepassword
        force_tls: true
        require_transport_security: true
        enable_tls: false
        tlsname: mail.server.example.com
        notif_from: "Your Friendly %(app)s homeserver <noreply@example.com>"
        app_name: my_branded_matrix_server
        enable_notifs: true
        notif_for_new_users: false
        client_base_url: "http://localhost/riot"
        validation_token_lifetime: 15m
        invite_client_location: "https://app.element.io"
        subjects:
          message_from_person_in_room: >-
            [%(app)s] You have a message on %(app)s from %(person)s in the
            %(room)s room...
          message_from_person: >-
            [%(app)s] You have a message on %(app)s from %(person)s...
          messages_from_person: >-
            [%(app)s] You have messages on %(app)s from %(person)s...
          messages_in_room: >-
            [%(app)s] You have messages on %(app)s in the %(room)s room...
          messages_in_room_and_others: >-
            [%(app)s] You have messages on %(app)s in the %(room)s room and others...
          messages_from_person_and_others: >-
            [%(app)s] You have messages on %(app)s from %(person)s and others...
          invite_from_person_to_room: >-
            [%(app)s] %(person)s has invited you to join the %(room)s room on %(app)s...
          invite_from_person: >-
            [%(app)s] %(person)s has invited you to chat on %(app)s...
          password_reset: "[%(server_name)s] Password reset"
          email_validation: "[%(server_name)s] Validate your email"
  max_event_delay_duration:
    oneOf:
      - $ref: "#/$defs/duration"
      - type: "null"
    description: >-
      The maximum allowed duration by which sent events can be delayed, as
      per
      [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140).
      Must be a positive value if set.


      If null or unset, sending of delayed events is disallowed.
    default: null
    examples:
      - 24h
  user_types:
    type: object
    description: >-
      Configuration settings related to the user types feature.
    properties:
      default_user_type:
        type: ["string", "null"]
        description: "The default user type to use for registering new users when no value has been specified. Defaults to none."
        default: null
      extra_user_types:
        type: array
        description: "Array of additional user types to allow. These are treated as real users."
        items:
          type: string
        default: []
    examples:
      - default_user_type: "custom"
        extra_user_types: ["custom", "custom2"]
  admin_contact:
    type: ["string", "null"]
    description: How to reach the server admin, used in `ResourceLimitError`.
    default: null
    examples:
      - "mailto:admin@server.com"
  hs_disabled:
    type: boolean
    description: >-
      Blocks users from connecting to the homeserver and provides the
      human-readable reason given in `hs_disabled_message`.
    default: false
    examples:
      - true
  hs_disabled_message:
    type: string
    description: Human-readable reason why the connection was blocked.
    default: Homeserver is currently blocked
    examples:
      - Reason for why the HS is blocked
  limit_usage_by_mau:
    type: boolean
    description: >-
      This option disables/enables monthly active user blocking. Used in cases
      where the admin or server owner wants to limit to the number of monthly
      active users. When enabled and a limit is reached the server returns a
      `ResourceLimitError` with error type `Codes.RESOURCE_LIMIT_EXCEEDED`. If
      this is enabled, a value for `max_mau_value` must also be set.


      See [Monthly Active Users](../administration/monthly_active_users.md) for
      details on how to configure MAU.
    default: false
    examples:
      - true
  max_mau_value:
    type: integer
    description: >-
      This option sets the hard limit of monthly active users above which the
      server will start blocking user actions if `limit_usage_by_mau` is
      enabled.
    default: 0
    examples:
      - 50
  mau_trial_days:
    type: integer
    description: >-
      The option `mau_trial_days` is a means to add a grace period for active
      users. It means that users must be active for the specified number of days
      before they can be considered active and guards against the case where
      lots of users sign up in a short space of time never to return after their
      initial session.
    default: 0
    examples:
      - 5
  mau_appservice_trial_days:
    type: object
    description: >-
      The option `mau_appservice_trial_days` is similar to `mau_trial_days`, but
      applies a different trial number if the user was registered by an
      appservice. A value of 0 means no trial days are applied. Appservices not
      listed in this dictionary use the value of `mau_trial_days` instead.
    additionalProperties:
      type: integer
    default: {}
    examples:
      - my_appservice_id: 3
        another_appservice_id: 6
  mau_limit_alerting:
    type: boolean
    description: >-
      Limit client-side alerting should the mau limit be reached. This is useful
      for small instances where the admin has 5 mau seats (say) for 5 specific
      people and no interest increasing the mau limit further.
    default: true
    examples:
      - false
  mau_stats_only:
    type: boolean
    description: >-
      If enabled, the metrics for the number of monthly active users will be
      populated, however no one will be limited based on these numbers. If
      `limit_usage_by_mau` is true, this is implied to be true.
    default: false
    examples:
      - true
  mau_limit_reserved_threepids:
    type: array
    description: >-
      Sometimes the server admin will want to ensure certain accounts are never
      blocked by mau checking. These accounts are specified by this option. Add
      accounts by specifying the `medium` and `address` of the reserved threepid
      (3rd party identifier).
    items:
      type: object
      properties:
        medium:
          type: string
          description: Medium of the account threepid.
        address:
          type: string
          description: Address of the account threepid.
    default: []
    examples:
      - - medium: email
          address: reserved_user@example.com
  server_context:
    type: ["string", "null"]
    description: >-
      This option is used by phonehome stats to group together related servers.
    default: null
    examples:
      - context
  limit_remote_rooms:
    type: object
    description: >-
      When this option is enabled, the room "complexity" will be checked before
      a user joins a new remote room. If it is above the complexity limit, the
      server will disallow joining, or will instantly leave. This is useful for
      homeservers that are resource-constrained. In Synapse, the complexity of a
      room is measured by the number of current state events in a room, divided
      by 500. "Current" here means the latest state, i.e. if a user joins, then
      leaves, then joins, that will count as 1 current `m.room.member` state
      event.
    properties:
      enabled:
        type: boolean
        description: Whether this check is enabled.
        default: false
      complexity:
        type: number
        description: The limit above which rooms cannot be joined.
        default: 1.0
      complexity_error:
        type: string
        description: >-
          Override the error which is returned when the room is too complex with
          a custom message.
        default: >-
          Your homeserver is unable to join rooms this large or complex. Please
          speak to your server administrator, or upgrade your instance to join
          this room.
      admins_can_join:
        type: boolean
        description: Allow server admins to join complex rooms.
        default: false
    examples:
      - enabled: true
        complexity: 0.5
        complexity_error: I can't let you do that, Dave.
        admins_can_join: true
  require_membership_for_aliases:
    type: boolean
    description: Whether to require a user to be in the room to add an alias to it.
    default: true
    examples:
      - false
  allow_per_room_profiles:
    type: boolean
    description: >-
      Whether to allow per-room membership profiles through the sending of
      membership events with profile information that differs from the target's
      global profile.
    default: true
    examples:
      - false
  max_avatar_size:
    oneOf:
      - $ref: "#/$defs/bytes"
      - type: "null"
    description: >-
      The largest permissible file size in bytes for a user avatar. Defaults to
      no restriction. Use M for MB and K for KB.


      Note that user avatar changes will not work if this is set without using
      Synapse's media repository.
    default: null
    examples:
      - 10M
  allowed_avatar_mimetypes:
    type: ["array", "null"]
    description: >-
      The MIME types allowed for user avatars. Defaults to no restriction.


      Note that user avatar changes will not work if this is set without using
      Synapse's media repository.
    items:
      type: string
    default: null
    examples:
      - - image/png
        - image/jpeg
        - image/gif
  redaction_retention_period:
    oneOf:
      - $ref: "#/$defs/duration"
      - type: "null"
    description: >-
      How long to keep redacted events in unredacted form in the database. After
      this period redacted events get replaced with their redacted form in the
      DB.


      Synapse will check whether the rentention period has concluded for
      redacted events every 5 minutes. Thus, even if this option is set to `0`,
      Synapse may still take up to 5 minutes to purge redacted events from the
      database. Set to `null` to disable.
    default: 7d
    examples:
      - 28d
  forgotten_room_retention_period:
    oneOf:
      - $ref: "#/$defs/duration"
      - type: "null"
    description: >-
      How long to keep locally forgotten rooms before purging them from the DB.
      A value of `null` means it's disabled.
    default: null
    examples:
      - 28d
  user_ips_max_age:
    oneOf:
      - $ref: "#/$defs/duration"
      - type: "null"
    description: >-
      How long to track users' last seen time and IPs in the database. Set to
      `null` to disable clearing out of old rows.
    default: 28d
    examples:
      - 14d
  request_token_inhibit_3pid_errors:
    type: boolean
    description: >-
      Inhibits the `/requestToken` endpoints from returning an error that might
      leak information about whether an e-mail address is in use or not on this
      homeserver. Note that for some endpoints the error situation is the e-mail
      already being used, and for others the error is entering the e-mail being
      unused. If this option is enabled, instead of returning an error, these
      endpoints will act as if no error happened and return a fake session ID
      (`sid`) to clients.
    default: false
    examples:
      - true
  next_link_domain_whitelist:
    type: ["array", "null"]
    description: >-
      A list of domains that the domain portion of `next_link` parameters must
      match.


      This parameter is optionally provided by clients while requesting
      validation of an email or phone number, and maps to a link that users will
      be automatically redirected to after validation succeeds. Clients can make
      use this parameter to aid the validation process.


      The whitelist is applied whether the homeserver or an identity server is
      handling validation.


      The default value is no whitelist functionality; all domains are allowed.
      Setting this value to an empty list will instead disallow all domains.
    default: null
    examples:
      - matrix.org
  templates:
    type: object
    description: >-
      These options define templates to use when generating email or HTML page
      contents.


      See [here](../../templates.md) for more information about using custom
      templates.
    properties:
      custom_template_directory:
        type: ["string", "null"]
        description: >-
          Determines which directory Synapse will try to find template files in
          to use to generate email or HTML page contents. If not set, or a file
          is not found within the template directory, a default template from
          within the Synapse package will be used.
        default: null
    examples:
      - custom_template_directory: /path/to/custom/templates/
  retention:
    type: object
    description: >-
      This option and the associated options determine message retention policy
      at the server level.


      Room admins and mods can define a retention period for their rooms using
      the `m.room.retention` state event, and server admins can cap this period
      by setting the `allowed_lifetime_min` and `allowed_lifetime_max` config
      options.


      If this feature is enabled, Synapse will regularly look for and purge
      events which are older than the room's maximum retention period. Synapse
      will also filter events received over federation so that events that
      should have been purged are ignored and not stored again.


      The message retention policies feature is disabled by default. You can
      read more about this feature [here](../../message_retention_policies.md).
    properties:
      enabled:
        type: boolean
        description: Enforce message retention policies
        default: false
      default_policy:
        type: object
        description: >-
          Default message retention policy. If set, Synapse will apply it to
          rooms that lack the `m.room.retention` state event.
        properties:
          min_lifetime:
            oneOf:
              - $ref: "#/$defs/duration"
              - type: "null"
            description: >-
              Minimum message retention time of the default message retention
              policy. Synapse doesn't take this option into account yet.
            default: null
          max_lifetime:
            oneOf:
              - $ref: "#/$defs/duration"
              - type: "null"
            description: >-
              Maximum message retention time of the default message retention policy.
            default: null
      allowed_lifetime_min:
        oneOf:
          - $ref: "#/$defs/duration"
          - type: "null"
        description: >-
          Retention policy limit. If set, and the state of a room contains a
          `m.room.retention` event in its state which contains a `min_lifetime`
          that's beyond this bound, Synapse will cap the room's policy to these
          limits when running purge jobs.
        default: null
      allowed_lifetime_max:
        oneOf:
          - $ref: "#/$defs/duration"
          - type: "null"
        description: >-
          Retention policy limit. If set, and the state of a room contains a
          `m.room.retention` event in its state which contains a `max_lifetime`
          that's beyond this bound, Synapse will cap the room's policy to these
          limits when running purge jobs.
        default: null
      purge_jobs:
        type: ["array", "null"]
        description: >-
          Server admins can define the settings of the background jobs purging
          the events whose lifetime has expired under the `purge_jobs` section.


          If no configuration is provided for this option, a single job will be
          set up to delete expired events in every room daily.


          Each job's configuration defines which range of message lifetimes the
          job takes care of. For example, if `shortest_max_lifetime` is "2d" and
          `longest_max_lifetime` is "3d", the job will handle purging expired
          events in rooms whose state defines a `max_lifetime` that's both
          higher than 2 days, and lower than or equal to 3 days. Both the
          minimum and the maximum value of a range are optional, e.g. a job with
          no `shortest_max_lifetime` and a `longest_max_lifetime` of "3d" will
          handle every room with a retention policy whose `max_lifetime` is
          lower than or equal to three days.


          The rationale for this per-job configuration is that some rooms might
          have a retention policy with a low `max_lifetime`, where history needs
          to be purged of outdated messages on a more frequent basis than for
          the rest of the rooms (e.g. every 12h), but not want that purge to be
          performed by a job that's iterating over every room it knows, which
          could be heavy on the server.


          If any purge job is configured, it is strongly recommended to have at
          least a single job with neither `shortest_max_lifetime` nor
          `longest_max_lifetime` set, or one job without `shortest_max_lifetime`
          and one job without `longest_max_lifetime` set. Otherwise some rooms
          might be ignored, even if `allowed_lifetime_min` and
          `allowed_lifetime_max` are set, because capping a room's policy to
          these values is done after the policies are retrieved from Synapse's
          database (which is done using the range specified in a purge job's
          configuration).
        items:
          type: object
          properties:
            shortest_max_lifetime:
              oneOf:
                - $ref: "#/$defs/duration"
                - type: "null"
              description: >-
                Apply job to rooms that have a `max_lifetime` higher than
                `shortest_max_lifetime`. A value of `null` never excludes any
                room.
            longest_max_lifetime:
              oneOf:
                - $ref: "#/$defs/duration"
                - type: "null"
              description: >-
                Apply job to rooms that have a `max_lifetime` lower than or
                equal to `shortest_max_lifetime`. A value of `null` never
                excludes any room.
            interval:
              $ref: "#/$defs/duration"
              description: How often to run the job.
        default: null
    examples:
      - enabled: true
        default_policy:
          min_lifetime: 1d
          max_lifetime: 1y
        allowed_lifetime_min: 1d
        allowed_lifetime_max: 1y
        purge_jobs:
          - longest_max_lifetime: 3d
            interval: 12h
          - shortest_max_lifetime: 3d
            interval: 1d
  tls_certificate_path:
    type: ["string", "null"]
    description: >-
      This option specifies a PEM-encoded X509 certificate for TLS. This
      certificate, as of Synapse 1.0, will need to be a valid and verifiable
      certificate, signed by a recognised Certificate Authority.


      Be sure to use a `.pem` file that includes the full certificate chain
      including any intermediate certificates (for instance, if using certbot,
      use `fullchain.pem` as your certificate, not `cert.pem`).
    default: null
    examples:
      - CONFDIR/SERVERNAME.tls.crt
  tls_private_key_path:
    type: ["string", "null"]
    description: PEM-encoded private key for TLS.
    default: null
    examples:
      - CONFDIR/SERVERNAME.tls.key
  federation_verify_certificates:
    type: boolean
    description: >-
      Whether to verify TLS server certificates for outbound federation
      requests. To disable certificate verification, set the option to false.
    default: true
    examples:
      - false
  federation_client_minimum_tls_version:
    type: string
    description: >-
      The minimum TLS version that will be used for outbound federation
      requests.


      Configurable to `"1"`, `"1.1"`, `"1.2"`, or `"1.3"`. Note that setting
      this value higher than `"1.2"` will prevent federation to most of the
      public Matrix network: only configure it to `"1.3"` if you have an
      entirely private federation setup and you can ensure TLS 1.3 support.
    default: "1"
    examples:
      - "1.2"
  federation_certificate_verification_whitelist:
    type: array
    description: >-
      Skip federation certificate verification on a given whitelist of domains.


      This setting should only be used in very specific cases, such as
      federation over Tor hidden services and similar. For private networks of
      homeservers, you likely want to use a private CA instead.


      Only effective if `federation_verify_certificates` is `true`.
    items:
      type: string
    default: []
    examples:
      - - lon.example.com
        - "*.domain.com"
        - "*.onion"
  federation_custom_ca_list:
    type: array
    description: >-
      List of custom certificate authorities for federation traffic.


      This setting should only normally be used within a private network of
      homeservers.


      Note that this list will replace those that are provided by your operating
      environment. Certificates must be in PEM format.
    items:
      type: string
    default: []
    examples:
      - - myCA1.pem
        - myCA2.pem
        - myCA3.pem
  federation_domain_whitelist:
    type: array
    description: >-
      Restrict federation to the given whitelist of domains. N.B. we recommend
      also firewalling your federation listener to limit inbound federation
      traffic as early as possible, rather than relying purely on this
      application-layer restriction. If not specified, the default is to
      whitelist everything.


      Note: this does not stop a server from joining rooms that servers not on
      the whitelist are in. As such, this option is really only useful to
      establish a "private federation", where a group of servers all whitelist
      each other and have the same whitelist.
    items:
      type: string
    default: []
    examples:
      - - lon.example.com
        - nyc.example.com
        - syd.example.com
  federation_whitelist_endpoint_enabled:
    type: boolean
    description: >-
      Enables an endpoint for fetching the federation whitelist config.


      The request method and path is `GET
      /_synapse/client/v1/config/federation_whitelist`, and the response format
      is:


      ```json

      {
          "whitelist_enabled": true,  // Whether the federation whitelist is being enforced
          "whitelist": [  // Which server names are allowed by the whitelist
              "example.com"
          ]
      }

      ```


      If `whitelist_enabled` is `false` then the server is permitted to federate
      with all others.


      The endpoint requires authentication.
    default: false
    examples:
      - true
  federation_metrics_domains:
    type: array
    description: >-
      Report prometheus metrics on the age of PDUs being sent to and received
      from the given domains. This can be used to give an idea of "delay" on
      inbound and outbound federation, though be aware that any delay can be due
      to problems at either end or with the intermediate network.
    items:
      type: string
    default: []
    examples:
      - - matrix.org
        - example.com
  allow_profile_lookup_over_federation:
    type: boolean
    description: >-
      Set to false to disable profile lookup over federation. By default, the
      Federation API allows other homeservers to obtain profile data of any user
      on this homeserver.
    default: true
    examples:
      - false
  allow_device_name_lookup_over_federation:
    type: boolean
    description: >-
      Set this option to true to allow device display name lookup over
      federation. By default, the Federation API prevents other homeservers from
      obtaining the display names of any user devices on this homeserver.
    default: false
    examples:
      - true
  federation:
    type: object
    description: >-
      The federation section defines some sub-options related to federation.


      The following options are related to configuring timeout and retry logic
      for one request, independently of the others. Short retry algorithm is
      used when something or someone will wait for the request to have an
      answer, while long retry is used for requests that happen in the
      background, like sending a federation transaction.


      `destination_*` options control the retry logic when communicating with a
      specific homeserver destination. Unlike the previous configuration
      options, these values apply across all requests for a given destination
      and the state of the backoff is stored in the database.
    properties:
      client_timeout:
        $ref: "#/$defs/duration"
        description: Timeout for the federation requests.
        default: 60s
      max_short_retry_delay:
        $ref: "#/$defs/duration"
        description: Maximum delay to be used for the short retry algo.
        default: 2s
      max_long_retry_delay:
        $ref: "#/$defs/duration"
        description: Maximum delay to be used for the long retry algo.
        default: 60s
      max_short_retries:
        type: integer
        description: Maximum number of retries for the short retry algo.
        default: 3
      max_long_retries:
        type: integer
        description: Maximum number of retries for the long retry algo.
        default: 10
      destination_min_retry_interval:
        $ref: "#/$defs/duration"
        description: "The initial backoff, after the first request fails."
        default: 10m
      destination_retry_multiplier:
        type: integer
        description: >-
          How much we multiply the backoff by after each subsequent fail.
        default: 2
      destination_max_retry_interval:
        $ref: "#/$defs/duration"
        description: A cap on the backoff.
        default: 1w
    examples:
      - client_timeout: 180s
        max_short_retry_delay: 7s
        max_long_retry_delay: 100s
        max_short_retries: 5
        max_long_retries: 20
        destination_min_retry_interval: 30s
        destination_retry_multiplier: 5
        destination_max_retry_interval: 12h
  event_cache_size:
    $ref: "#/$defs/size"
    description: >-
      The number of events to cache in memory. Defaults to 10K. Like other
      caches, this is affected by `caches.global_factor` (see below).


      For example, the default is 10K and the global_factor default is 0.5.


      Since 10K * 0.5 is 5K then the event cache size will be 5K.


      The cache affected by this configuration is named as "\*getEvent\*".


      Note that this option is not part of the `caches` section.
    default: 10K
    examples:
      - 15K
  caches:
    type: object
    description: >-
      A cache "factor" is a multiplier that can be applied to each of Synapse's
      caches in order to increase or decrease the maximum number of entries that
      can be stored.
    io.element.post_description: >-
      ### Reloading cache factors


      The cache factors (i.e. `caches.global_factor` and
      `caches.per_cache_factors`)  may be reloaded at any time by sending a
      [`SIGHUP`](https://en.wikipedia.org/wiki/SIGHUP) signal to Synapse
      using e.g.


      ```commandline

      kill -HUP [PID_OF_SYNAPSE_PROCESS]

      ```


      If you are running multiple workers, you must individually update the
      worker config file and send this signal to each worker process.


      If you're using the [example systemd
      service](https://github.com/element-hq/synapse/blob/develop/contrib/systemd/matrix-synapse.service)
      file in Synapse's `contrib` directory, you can send a `SIGHUP` signal by
      using `systemctl reload matrix-synapse`.
    properties:
      global_factor:
        type: number
        description: >-
          Controls the global cache factor, which is the default cache factor
          for all caches if a specific factor for that cache is not otherwise
          set.


          This can also be set by the `SYNAPSE_CACHE_FACTOR` environment
          variable. Setting by environment variable takes priority over setting
          through the config file.


          Defaults to 0.5, which will halve the size of all caches.


          Note that changing this value also affects the HTTP connection pool.
        default: 0.5
      per_cache_factors:
        type: object
        description: >-
          A dictionary of cache name to cache factor for that individual cache.
          Overrides the global cache factor for a given cache.


          These can also be set through environment variables comprised of
          `SYNAPSE_CACHE_FACTOR_` + the name of the cache in capital letters and
          underscores. Setting by environment variable takes priority over
          setting through the config file. Ex.
          `SYNAPSE_CACHE_FACTOR_GET_USERS_WHO_SHARE_ROOM_WITH_USER=2.0`


          Some caches have '*' and other characters that are not alphanumeric or
          underscores. These caches can be named with or without the special
          characters stripped. For example, to specify the cache factor for
          `*stateGroupCache*` via an environment variable would be
          `SYNAPSE_CACHE_FACTOR_STATEGROUPCACHE=2.0`.
        additionalProperties:
          type: number
        default: {}
      expire_caches:
        type: boolean
        description: >-
          Controls whether cache entries are evicted after a specified time
          period. Set to false to disable this feature. Note that never expiring
          caches may result in excessive memory usage.
        default: true
      cache_entry_ttl:
        $ref: "#/$defs/duration"
        description: >-
          If `expire_caches` is enabled, this flag controls how long an entry
          can be in a cache without having been accessed before being evicted.
        default: 30m
      sync_response_cache_duration:
        $ref: "#/$defs/duration"
        description: >-
          Controls how long the results of a /sync request are cached for after
          a successful response is returned. A higher duration can help clients
          with intermittent connections, at the cost of higher memory usage. A
          value of zero means that sync responses are not cached.


          *Changed in Synapse 1.62.0*: The default was changed from 0 to 2m.
        default: 2m
      cache_autotuning:
        type: object
        description: >-
          `cache_autotuning` and its sub-options `max_cache_memory_usage`,
          `target_cache_memory_usage`, and `min_cache_ttl` work in conjunction
          with each other to maintain a balance between cache memory usage and
          cache entry availability. You must be using
          [jemalloc](../administration/admin_faq.md#help-synapse-is-slow-and-eats-all-my-ramcpu)
          to utilize this option, and all three of the options must be specified
          for this feature to work. This option defaults to off, enable it by
          providing values for the sub-options listed below. Please note that
          the feature will not work and may cause unstable behavior (such as
          excessive emptying of caches or exceptions) if all of the values are
          not provided. Please see the [Config Conventions](#config-conventions)
          for information on how to specify memory size and cache expiry
          durations.
        properties:
          max_cache_memory_usage:
            oneOf:
              - $ref: "#/$defs/duration"
              - type: "null"
            description: >-
              Sets a ceiling on how much memory the cache can use before caches
              begin to be continuously evicted. They will continue to be evicted
              until the memory usage drops below the
              `target_cache_memory_usage`, set in the setting below, or until
              the `min_cache_ttl` is hit.
            default: null
          target_cache_memory_usage:
            oneOf:
              - $ref: "#/$defs/bytes"
              - type: "null"
            description: Sets a rough target for the desired memory usage of the caches.
            default: null
          min_cache_ttl:
            oneOf:
              - $ref: "#/$defs/duration"
              - type: "null"
            description: >-
              Sets a limit under which newer cache entries are not evicted and
              is only applied when caches are actively being
              evicted/`max_cache_memory_usage` has been exceeded. This is to
              protect hot caches from being emptied while Synapse is evicting
              due to memory.
            default: null
    examples:
      - global_factor: 1.0
        per_cache_factors:
          get_users_who_share_room_with_user: 2.0
        sync_response_cache_duration: 2m
        cache_autotuning:
          max_cache_memory_usage: 1024M
          target_cache_memory_usage: 758M
          min_cache_ttl: 5m
  database:
    $ref: "#/$defs/database"
    examples:
      - name: sqlite3
        args:
          database: /path/to/homeserver.db
      - name: psycopg2
        txn_limit: 10000
        args:
          user: synapse_user
          password: secretpassword
          dbname: synapse
          host: localhost
          port: 5432
          cp_min: 5
          cp_max: 10
  databases:
    type: object
    description: >-
      The `databases` option allows specifying a mapping between certain
      database tables and database host details, spreading the load of a single
      Synapse instance across multiple database backends. This is often referred
      to as "database sharding". This option is only supported for PostgreSQL
      database backends.


      **Important note:** This is a supported option, but is not currently used
      in production by the Matrix.org Foundation. Proceed with caution and
      always make backups.


      `databases` is a dictionary of arbitrarily-named database entries. Each
      entry is equivalent to the value of the `database` homeserver config
      option (see above), with the addition of a `data_stores` key.
      `data_stores` is an array of strings that specifies the data store(s) (a
      defined label for a set of tables) that should be stored on the associated
      database backend entry.


      The currently defined values for `data_stores` are:


      * `"state"`: Database that relates to state groups will be stored in this
      database.

        Specifically, that means the following tables:
        * `state_groups`
        * `state_group_edges`
        * `state_groups_state`

        And the following sequences:
        * `state_groups_seq_id`

      * `"main"`: All other database tables and sequences.


      All databases will end up with additional tables used for tracking
      database schema migrations and any pending background updates. Synapse
      will create these automatically on startup when checking for and/or
      performing database schema migrations.


      To migrate an existing database configuration (e.g. all tables on a single
      database) to a different configuration (e.g. the "main" data store on one
      database, and "state" on another), do the following:


      1. Take a backup of your existing database. Things can and do go wrong and
      database corruption is no joke!

      2. Ensure all pending database migrations have been applied and background
      updates have run. The simplest way to do this is to use the
      `update_synapse_database` script supplied with your Synapse installation.

         ```sh
         update_synapse_database --database-config homeserver.yaml --run-background-updates
         ```

      3. Copy over the necessary tables and sequences from one database to the
      other. Tables relating to database migrations, schemas, schema versions
      and background updates should **not** be copied.

         As an example, say that you'd like to split out the "state" data store from an existing database which currently contains all data stores.

         Simply copy the tables and sequences defined above for the "state" datastore from the existing database to the secondary database. As noted above, additional tables will be created in the secondary database when Synapse is started.

      4. Modify/create the `databases` option in your `homeserver.yaml` to match
      the desired database configuration.

      5. Start Synapse. Check that it starts up successfully and that things
      generally seem to be working.

      6. Drop the old tables that were copied in step 3.


      Only one of the options `database` or `databases` may be specified in your
      config, but not both.
    additionalProperties:
      $ref: "#/$defs/database"
      properties:
        data_stores:
          type: array
          items:
            type: string
            enum:
              - state
              - main
    default: {}
    examples:
      - basement_box:
          name: psycopg2
          txn_limit: 10000
          data_stores:
            - main
          args:
            user: synapse_user
            password: secretpassword
            dbname: synapse_main
            host: localhost
            port: 5432
            cp_min: 5
            cp_max: 10
        my_other_database:
          name: psycopg2
          txn_limit: 10000
          data_stores:
            - state
          args:
            user: synapse_user
            password: secretpassword
            dbname: synapse_state
            host: localhost
            port: 5432
            cp_min: 5
            cp_max: 10
  log_config:
    type: ["string", "null"]
    description: >-
      This option specifies a yaml python logging config file as described
      [here](https://docs.python.org/3/library/logging.config.html#configuration-dictionary-schema).
    default: null
    examples:
      - CONFDIR/SERVERNAME.log.config
  rc_message:
    $ref: "#/$defs/rc"
    description: >-
      Ratelimiting settings for client messaging.


      This is a ratelimiting option for messages that ratelimits sending based
      on the account the client is using.
    default:
      per_second: 0.2
      burst_count: 10.0
    examples:
      - per_second: 0.5
        burst_count: 15.0
  rc_registration:
    $ref: "#/$defs/rc"
    description: >-
      This option ratelimits registration requests based on the client's IP address.
    default:
      per_second: 0.17
      burst_count: 3.0
    examples:
      - per_second: 0.15
        burst_count: 2.0
  rc_registration_token_validity:
    $ref: "#/$defs/rc"
    description: >-
      This option checks the validity of registration tokens that ratelimits
      requests based on the client's IP address.
    default:
      per_second: 0.1
      burst_count: 5.0
    examples:
      - per_second: 0.3
        burst_count: 6.0
  rc_login:
    type: object
    description: This option specifies several limits for login.
    properties:
      address:
        $ref: "#/$defs/rc"
        description: Ratelimits login requests based on the client's IP address.
        default:
          per_second: 0.003
          burst_count: 5.0
      account:
        $ref: "#/$defs/rc"
        description: >-
          Ratelimits login requests based on the account the client is
          attempting to log into.
        default:
          per_second: 0.003
          burst_count: 5.0
      failed_attempts:
        $ref: "#/$defs/rc"
        description: >-
          Ratelimits login requests based on the account the client is
          attempting to log into, based on the amount of failed login attempts
          for this account.
        default:
          per_second: 0.17
          burst_count: 3.0
    examples:
      - address:
          per_second: 0.15
          burst_count: 5.0
        account:
          per_second: 0.18
          burst_count: 4.0
        failed_attempts:
          per_second: 0.19
          burst_count: 7.0
  rc_admin_redaction:
    $ref: "#/$defs/rc"
    description: >-
      This option sets ratelimiting redactions by room admins. If this is not
      explicitly set then it uses the same ratelimiting as per `rc_message`.
      This is useful to allow room admins to deal with abuse quickly.
    examples:
      - per_second: 1.0
        burst_count: 50.0
  rc_joins:
    type: object
    description: This option allows for ratelimiting number of rooms a user can join.
    properties:
      local:
        $ref: "#/$defs/rc"
        description: Ratelimits when users are joining rooms the server is already in.
        default:
          per_second: 0.1
          burst_count: 10.0
      remote:
        $ref: "#/$defs/rc"
        description: >-
          Ratelimits when users are trying to join rooms not on the server
          (which can be more computationally expensive than restricting
          locally).
        default:
          per_second: 0.01
          burst_count: 10.0
    examples:
      - local:
          per_second: 0.2
          burst_count: 15.0
        remote:
          per_second: 0.03
          burst_count: 12.0
  rc_joins_per_room:
    $ref: "#/$defs/rc"
    description: >-
      This option allows admins to ratelimit joins to a room based on the number
      of recent joins (local or remote) to that room. It is intended to mitigate
      mass-join spam waves which target multiple homeservers.


      _Added in Synapse 1.64.0._
    default:
      per_second: 1.0
      burst_count: 10.0
    examples:
      - per_second: 1.0
        burst_count: 10.0
  rc_3pid_validation:
    $ref: "#/$defs/rc"
    description: >-
      This option ratelimits how often a user or IP can attempt to validate a 3PID.
    default:
      per_second: 0.003
      burst_count: 5.0
    examples:
      - per_second: 0.003
        burst_count: 5.0
  rc_invites:
    type: object
    description: >-
      This option sets ratelimiting how often invites can be sent in a room or
      to a specific user.


      Client requests that invite user(s) when [creating a
      room](https://spec.matrix.org/v1.2/client-server-api/#post_matrixclientv3createroom)
      will count against the `rc_invites.per_room` limit, whereas client
      requests to [invite a single user to a
      room](https://spec.matrix.org/v1.2/client-server-api/#post_matrixclientv3roomsroomidinvite)
      will count against both the `rc_invites.per_user` and
      `rc_invites.per_room` limits.


      Federation requests to invite a user will count against the
      `rc_invites.per_user` limit only, as Synapse presumes ratelimiting by room
      will be done by the sending server.


      _Changed in version 1.63:_ added the `per_issuer` limit.
    properties:
      per_room:
        $ref: "#/$defs/rc"
        description: Applies to the room of the invitation.
        default:
          per_second: 0.3
          burst_count: 10.0
      per_user:
        $ref: "#/$defs/rc"
        description: >-
          Applies to the *receiver* of the invite, rather than the sender,
          meaning that a `rc_invite.per_user.burst_count` of 5 mandates that a
          single user cannot *receive* more than a burst of 5 invites at a
          time.
        default:
          per_second: 0.003
          burst_count: 5.0
      per_issuer:
        $ref: "#/$defs/rc"
        description: >-
          Applies to the *issuer* of the invite, meaning that a
          `rc_invite.per_issuer.burst_count` of 5 mandates that single user
          cannot *send* more than a burst of 5 invites at a time.
        default:
          per_second: 0.3
          burst_count: 10.0
    examples:
      - per_room:
          per_second: 0.5
          burst_count: 5.0
        per_user:
          per_second: 0.004
          burst_count: 3.0
        per_issuer:
          per_second: 0.5
          burst_count: 5.0
  rc_third_party_invite:
    $ref: "#/$defs/rc"
    description: >-
      This option ratelimits 3PID invites (i.e. invites sent to a third-party ID
      such as an email address or a phone number) based on the account that's
      sending the invite.
    default:
      per_second: 0.2
      burst_count: 10.0
  rc_media_create:
    $ref: "#/$defs/rc"
    description: >-
      This option ratelimits creation of MXC URIs via the
      `/_matrix/media/v1/create` endpoint based on the account that's creating
      the media.
    default:
      per_second: 10.0
      burst_count: 50.0
  rc_federation:
    type: object
    description: Defines limits on federation requests.
    properties:
      window_size:
        type: integer
        description: Window size in milliseconds.
        default: 1000
      sleep_limit:
        type: integer
        description: >-
          Number of federation requests from a single server in a window before
          the server will delay processing the request.
        default: 10
      sleep_delay:
        type: integer
        description: >-
          Duration in milliseconds to delay processing events from remote
          servers by if they go over the sleep limit.
        default: 500
      reject_limit:
        type: integer
        description: >-
          Maximum number of concurrent federation requests allowed from a single server.
        default: 50
      concurrent:
        type: integer
        description: >-
          Number of federation requests to concurrently process from a single server.
        default: 3
    examples:
      - window_size: 750
        sleep_limit: 15
        sleep_delay: 400
        reject_limit: 40
        concurrent: 5
  rc_presence:
    type: object
    description: This option sets ratelimiting for presence.
    properties:
      per_user:
        $ref: "#/$defs/rc"
        description: >-
          Sets rate limits on how often a specific users' presence updates are
          evaluated. Ratelimited presence updates sent via sync are ignored, and
          no error is returned to the client. This option also sets the rate
          limit for the [`PUT /_matrix/client/v3/presence/{userId}/status`]
          endpoint.


          [`PUT /_matrix/client/v3/presence/{userId}/status`]:
            <https://spec.matrix.org/latest/client-server-api/#put_matrixclientv3presenceuseridstatus>
    default:
      per_user:
        per_second: 0.1
        burst_count: 1.0
    examples:
      - per_user:
          per_second: 0.05
          burst_count: 1.0
  rc_delayed_event_mgmt:
    $ref: "#/$defs/rc"
    description: >-
      Ratelimiting settings for delayed event management.


      This is a ratelimiting option that ratelimits attempts to restart, cancel,
      or view delayed events based on the sending client's account and device
      ID.


      Attempts to create or send delayed events are ratelimited not by this
      setting, but by `rc_message`.


      Setting this to a high value allows clients to make delayed event
      management requests often (such as repeatedly restarting a delayed event
      with a short timeout, or restarting several different delayed events all
      at once) without the risk of being ratelimited.
    default:
      per_second: 1.0
      burst_count: 5.0
    examples:
      - per_second: 2.0
        burst_count: 20.0
  rc_reports:
    $ref: "#/$defs/rc"
    description: >-
      Ratelimiting settings for reporting content.

      This is a ratelimiting option that ratelimits reports made by users
      about content they see.

      Setting this to a high value allows users to report content quickly, possibly in
      duplicate. This can result in higher database usage.
    default:
      per_second: 1.0
      burst_count: 5.0
    examples:
      - per_second: 2.0
        burst_count: 20.0
  rc_room_creation:
    $ref: "#/$defs/rc"
    description: >-
      Sets rate limits for how often users are able to create rooms.
    default:
      per_second: 0.016
      burst_count: 10.0
    examples:
      - per_second: 1.0
        burst_count: 5.0
  rc_user_directory:
    $ref: "#/$defs/rc"
    description: >-
      This option allows admins to ratelimit searches in the user directory.


      _Added in Synapse 1.145.0._
    default:
      per_second: 0.016
      burst_count: 200.0
  federation_rr_transactions_per_room_per_second:
    type: integer
    description: >-
      Sets outgoing federation transaction frequency for sending read-receipts,
      per-room.


      If we end up trying to send out more read-receipts, they will get buffered
      up into fewer transactions.
    default: 50
    examples:
      - 40
  enable_authenticated_media:
    type: boolean
    description: >-
      When set to true, all subsequent media uploads will be marked as
      authenticated, and will not be available over legacy unauthenticated media
      endpoints (`/_matrix/media/(r0|v3|v1)/download` and
      `/_matrix/media/(r0|v3|v1)/thumbnail`) – requests for authenticated media
      over these endpoints will result in a 404. All media, including
      authenticated media, will be available over the authenticated media
      endpoints `_matrix/client/v1/media/download` and
      `_matrix/client/v1/media/thumbnail`. Media uploaded prior to setting this
      option to true will still be available over the legacy endpoints. Note if
      the setting is switched to false after enabling, media marked as
      authenticated will be available over legacy endpoints. Defaults to true
      (previously false). In a future release of Synapse, this option will be
      removed and become always-on.


      In all cases, authenticated requests to download media will succeed, but
      for unauthenticated requests, this case-by-case breakdown describes
      whether media downloads are permitted:


      * `enable_authenticated_media = False`:
        * unauthenticated client or homeserver requesting local media: allowed
        * unauthenticated client or homeserver requesting remote media: allowed as long as the media is in the cache, or as long as the remote homeserver does not require authentication to retrieve the media
      * `enable_authenticated_media = True`:
        * unauthenticated client or homeserver requesting local media: allowed if the media was stored on the server whilst `enable_authenticated_media` was `False` (or in a previous Synapse version where this option did not exist); otherwise denied.
        * unauthenticated client or homeserver requesting remote media: the same as for local media; allowed if the media was stored on the server whilst `enable_authenticated_media` was `False` (or in a previous Synapse version where this option did not exist); otherwise denied.

      It is especially notable that media downloaded before this option existed
      (in older Synapse versions), or whilst this option was set to `False`,
      will perpetually be available over the legacy, unauthenticated endpoint,
      even after this option is set to `True`. This is for backwards
      compatibility with older clients and homeservers that do not yet support
      requesting authenticated media; those older clients or homeservers will
      not be cut off from media they can already see.


      _Changed in Synapse 1.120:_ This option now defaults to `True` when not
      set, whereas before this version it defaulted to `False`.
    default: true
    examples:
      - false
  enable_media_repo:
    type: boolean
    description: >-
      Enable the media store service in the Synapse master. Set to false if you
      are using a separate media store worker.
    default: true
    examples:
      - false
  enable_local_media_storage:
    type: boolean
    description: >-
      Enable the local on-disk media storage provider. When disabled, media is
      stored only in configured `media_storage_providers` and temporary files are
      used for processing.
      
      **Warning:** If this option is set to `false` and no `media_storage_providers`
      are configured, all media requests will return 404 errors as there will be
      no storage backend available.
    default: true
    examples:
      - false
  media_store_path:
    type: string
    description: Directory where uploaded images and attachments are stored.
    default: media_store
    examples:
      - DATADIR/media_store
  max_pending_media_uploads:
    type: integer
    description: >-
      How many *pending media uploads* can a given user have? A pending media
      upload is a created MXC URI that (a) is not expired (the
      `unused_expires_at` timestamp has not passed) and (b) the media has not
      yet been uploaded for.
    default: 5
    examples:
      - 5
  unused_expiration_time:
    $ref: "#/$defs/duration"
    description: How long to wait in milliseconds before expiring created media IDs.
    default: 24h
    examples:
      - 1h
  media_storage_providers:
    type: array
    description: >-
      Media storage providers allow media to be stored in different locations.
    items:
      type: object
      properties:
        module:
          type: string
          description: "Type of resource, e.g. `file_system`."
        store_local:
          type: boolean
          description: Whether to store newly uploaded local files.
        store_remote:
          type: boolean
          description: Whether to store newly downloaded local files.
        store_synchronous:
          type: boolean
          description: Whether to wait for successful storage for local uploads.
        config:
          type: object
          description: Sets a path to the resource through the `directory` option.
          properties:
            directory:
              type: string
              description: Path to the resource.
    default: []
    examples:
      - - module: file_system
          store_local: false
          store_remote: false
          store_synchronous: false
          config:
            directory: /mnt/some/other/directory
  max_upload_size:
    $ref: "#/$defs/bytes"
    description: >-
      The largest allowed upload size in bytes.


      If you are using a reverse proxy you may also need to set this value in
      your reverse proxy's config. Notably Nginx has a small max body size by
      default. See [here](../../reverse_proxy.md) for more on using a reverse
      proxy with Synapse.
    default: 50M
    examples:
      - 60M
  media_upload_limits:
    type: array
    description: >-
      A list of media upload limits defining how much data a given user can
      upload in a given time period.

      These limits are applied in addition to the `max_upload_size` limit above
      (which applies to individual uploads).


      An empty list means no limits are applied.


      These settings can be overridden using the `get_media_upload_limits_for_user`
      module API [callback](../../modules/media_repository_callbacks.md#get_media_upload_limits_for_user).
    default: []
    items:
      time_period:
        type: "#/$defs/duration"
        description: >-
          The time period over which the limit applies. Required.
      max_size:
        type: "#/$defs/bytes"
        description: >-
          Amount of data that can be uploaded in the time period by the user.
          Required.
    examples:
      - - time_period: 1h
          max_size: 100M
        - time_period: 1w
          max_size: 500M
  max_image_pixels:
    $ref: "#/$defs/bytes"
    description: Maximum number of pixels that will be thumbnailed.
    default: 32M
    examples:
      - 35M
  remote_media_download_burst_count:
    $ref: "#/$defs/bytes"
    description: >-
      Remote media downloads are ratelimited using a [leaky bucket
      algorithm](https://en.wikipedia.org/wiki/Leaky_bucket), where a given
      "bucket" is keyed to the IP address of the requester when requesting
      remote media downloads. This configuration option sets the size of the
      bucket against which the size in bytes of downloads are penalized – if the
      bucket is full, i.e. a given number of bytes have already been downloaded,
      further downloads will be denied until the bucket drains. See also
      `remote_media_download_per_second` which determines the rate at which the
      "bucket" is emptied and thus has available space to authorize new
      requests.
    default: 500MiB
    examples:
      - 200M
  remote_media_download_per_second:
    $ref: "#/$defs/bytes"
    description: >-
      Works in conjunction with `remote_media_download_burst_count` to ratelimit
      remote media downloads – this configuration option determines the rate at
      which the "bucket" (see above) leaks in bytes per second. As requests are
      made to download remote media, the size of those requests in bytes is
      added to the bucket, and once the bucket has reached it's capacity, no
      more requests will be allowed until a number of bytes has "drained" from
      the bucket. This setting determines the rate at which bytes drain from the
      bucket, with the practical effect that the larger the number, the faster
      the bucket leaks, allowing for more bytes downloaded over a shorter period
      of time. Defaults to 87KiB per second. See also
      `remote_media_download_burst_count`.
    default: 87KiB
    examples:
      - 40K
  prevent_media_downloads_from:
    type: array
    description: >-
      A list of domains to never download media from. Media from these domains
      that is already downloaded will not be deleted, but will be inaccessible
      to users. This option does not affect admin APIs trying to
      download/operate on media.


      This will not prevent the listed domains from accessing media themselves.
      It simply prevents users on this server from downloading media originating
      from the listed servers.


      This will have no effect on media originating from the local server. This
      only affects media downloaded from other Matrix servers, to control URL
      previews see
      [`url_preview_ip_range_blacklist`](#url_preview_ip_range_blacklist) or
      [`url_preview_url_blacklist`](#url_preview_url_blacklist).
    items:
      type: string
    default: []
    examples:
      - - evil.example.org
        - evil2.example.org
  dynamic_thumbnails:
    type: boolean
    description: >-
      Whether to generate new thumbnails on the fly to precisely match the
      resolution requested by the client. If true then whenever a new resolution
      is requested by the client the server will generate a new thumbnail. If
      false the server will pick a thumbnail from a precalculated list.
    default: false
    examples:
      - true
  thumbnail_sizes:
    type: array
    description: List of thumbnails to precalculate when an image is uploaded.
    items:
      type: object
      properties:
        width:
          type: integer
          description: Width of the generated thumbnail.
        height:
          type: integer
          description: Height of the generated thumbnail.
        method:
          type: string
          enum:
            - crop
            - scale
          description: >-
            Method to fit the thumbnail dimensions. Current options are `crop`
            and `scale`.
    default:
      - width: 32
        height: 32
        method: crop
      - width: 96
        height: 96
        method: crop
      - width: 320
        height: 240
        method: scale
      - width: 640
        height: 480
        method: scale
      - width: 800
        height: 600
        method: scale
  media_retention:
    type: object
    description: >-
      Controls whether local media and entries in the remote media cache (media
      that is downloaded from other homeservers) should be removed under certain
      conditions, typically for the purpose of saving space.


      Purging media files will be the carried out by the media worker (that is,
      the worker that has the `enable_media_repo` homeserver config option set
      to `true`). This may be the main process.


      The `media_retention.local_media_lifetime` and
      `media_retention.remote_media_lifetime` config options control whether
      media will be purged if it has not been accessed in a given amount of
      time. Note that media is "accessed" when loaded in a room in a client, or
      otherwise downloaded by a local or remote user. If the media has never
      been accessed, the media's creation time is used instead. Both thumbnails
      and the original media will be removed. If either of these options are
      unset, then media of that type will not be purged.


      Local or cached remote media that has been
      [quarantined](../../admin_api/media_admin_api.md#quarantining-media-in-a-room)
      will not be deleted. Similarly, local media that has been marked as
      [protected from
      quarantine](../../admin_api/media_admin_api.md#protecting-media-from-being-quarantined)
      will not be deleted.
    properties:
      local_media_lifetime:
        description: >-
          Duration without access to a local media resource after which it will
          be purged. If the media has never been accessed, the media's creation
          time is used instead. Both thumbnails and the original media will be
          removed. If unset or null, local media will not be purged.
        oneOf:
          - $ref: "#/$defs/duration"
          - type: "null"
        default: null
      remote_media_lifetime:
        description: >-
          Duration without access to a remote media resource after which it will
          be purged. If the media has never been accessed, the media's creation
          time is used instead. Both thumbnails and the original media will be
          removed. If unset or null, remote media will not be purged.
        oneOf:
          - $ref: "#/$defs/duration"
          - type: "null"
        default: null
    examples:
      - local_media_lifetime: 90d
        remote_media_lifetime: 14d
  url_preview_enabled:
    type: boolean
    description: >-
      This setting determines whether the preview URL API is enabled. Set to
      true to enable. If enabled you must specify a
      `url_preview_ip_range_blacklist` blacklist.
    default: false
    examples:
      - true
  url_preview_ip_range_blacklist:
    type: ["array", "null"]
    description: >-
      List of IP address CIDR ranges that the URL preview spider is denied from
      accessing. There are no defaults: you must explicitly specify a list for
      URL previewing to work. You should specify any internal services in your
      network that you do not want synapse to try to connect to, otherwise
      anyone in any Matrix room could cause your synapse to issue arbitrary GET
      requests to your internal services, causing serious security issues.


      (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
      listed here, since they correspond to unroutable addresses.)


      This must be specified if `url_preview_enabled` is set. It is recommended
      that you use the following example list as a starting point.


      Note: The value is ignored when an HTTP proxy is in use.
    items:
      type: string
    default: null
    examples:
      - - 127.0.0.0/8
        - 10.0.0.0/8
        - 172.16.0.0/12
        - 192.168.0.0/16
        - 100.64.0.0/10
        - 192.0.0.0/24
        - 169.254.0.0/16
        - 192.88.99.0/24
        - 198.18.0.0/15
        - 192.0.2.0/24
        - 198.51.100.0/24
        - 203.0.113.0/24
        - 224.0.0.0/4
        - "::1/128"
        - "fe80::/10"
        - "fc00::/7"
        - "2001:db8::/32"
        - "ff00::/8"
        - "fec0::/10"
  url_preview_ip_range_whitelist:
    type: array
    description: >-
      This option sets a list of IP address CIDR ranges that the URL preview
      spider is allowed to access even if they are specified in
      `url_preview_ip_range_blacklist`. This is useful for specifying exceptions
      to wide-ranging blacklisted target IP ranges – e.g. for enabling URL
      previews for a specific private website only visible in your network.
    items:
      type: string
    default: []
    examples:
      - - 192.168.1.1
  url_preview_url_blacklist:
    type: array
    description: >-
      Optional list of URL matches that the URL preview spider is denied from
      accessing. This is a usability feature, not a security one. You should use
      `url_preview_ip_range_blacklist` in preference to this, otherwise someone
      could define a public DNS entry that points to a private IP address and
      circumvent the blacklist. Applications that perform redirects or serve
      different content when detecting that Synapse is accessing them can also
      bypass the blacklist. This is more useful if you know there is an entire
      shape of URL that you know that you do not want Synapse to preview.


      Each list entry is a dictionary of url component attributes as returned by
      urlparse.urlsplit as applied to the absolute form of the URL. See
      [here](https://docs.python.org/2/library/urlparse.html#urlparse.urlsplit)
      for more information. Some examples are:


      * `username`

      * `netloc`

      * `scheme`

      * `path`


      The values of the dictionary are treated as a filename match pattern
      applied to that component of URLs, unless they start with a ^ in which
      case they are treated as a regular expression match. If all the specified
      component matches for a given list item succeed, the URL is blacklisted.
    items:
      type: object
    default: []
    examples:
      - - username: "*"
        - netloc: google.com
        - netloc: "*.google.com"
        - scheme: http
        - netloc: www.acme.com
          path: /foo
        - netloc: "^[0-9]+.[0-9]+.[0-9]+.[0-9]+$"
  max_spider_size:
    $ref: "#/$defs/bytes"
    description: The largest allowed URL preview spidering size in bytes.
    default: 10M
    examples:
      - 8M
  url_preview_accept_language:
    type: array
    description: >-
      A list of values for the Accept-Language HTTP header used when downloading
      webpages during URL preview generation. This allows Synapse to specify the
      preferred languages that URL previews should be in when communicating with
      remote servers.


      Each value is a IETF language tag; a 2-3 letter identifier for a language,
      optionally followed by subtags separated by `-`, specifying a country or
      region variant.


      Multiple values can be provided, and a weight can be added to each by
      using quality value syntax (;q=). `*` translates to any language.
    items:
      type: string
    default:
      - en
    examples:
      - - en-UK
        - en-US;q=0.9
        - fr;q=0.8
        - "*;q=0.7"
  oembed:
    type: object
    description: >-
      oEmbed allows for easier embedding content from a website. It can be used
      for generating URLs previews of services which support it. A default list
      of oEmbed providers is included with Synapse.
    properties:
      disable_default_providers:
        type: boolean
        description: Do not use Synapse's default list of oEmbed providers.
        default: false
      additional_providers:
        type: array
        description: >-
          Additional files with oEmbed configuration (each should be in the form
          of providers.json).
        items:
          type: string
        default: []
    examples:
      - disable_default_providers: true
        additional_providers:
          - oembed/my_providers.json
  recaptcha_public_key:
    type: ["string", "null"]
    description: >-
      This homeserver's ReCAPTCHA public key. Must be specified if
      [`enable_registration_captcha`](#enable_registration_captcha) is enabled.
    default: null
    examples:
      - YOUR_PUBLIC_KEY
  recaptcha_public_key_path:
    type: ["string", "null"]
    description: >-
      An alternative to [`recaptcha_public_key`](#recaptcha_public_key): allows
      the public key to be specified in an external file.


      The file should be a plain text file, containing only the public key.
      Synapse reads the public key from the given file once at startup.


      _Added in Synapse 1.135.0._
    default: null
    examples:
      - /path/to/key/file
  recaptcha_private_key:
    type: ["string", "null"]
    description: >-
      This homeserver's ReCAPTCHA private key. Must be specified if
      [`enable_registration_captcha`](#enable_registration_captcha) is enabled.
    default: null
    examples:
      - YOUR_PRIVATE_KEY
  recaptcha_private_key_path:
    type: ["string", "null"]
    description: >-
      An alternative to [`recaptcha_private_key`](#recaptcha_private_key):
      allows the private key to be specified in an external file.


      The file should be a plain text file, containing only the private key.
      Synapse reads the private key from the given file once at startup.


      _Added in Synapse 1.135.0._
    default: null
    examples:
      - /path/to/key/file
  enable_registration_captcha:
    type: boolean
    description: >-
      Set to `true` to require users to complete a CAPTCHA test when registering
      an account. Requires a valid ReCaptcha public/private key.


      Note that [`enable_registration`](#enable_registration) must also be set
      to allow account registration.
    default: false
    examples:
      - true
  recaptcha_siteverify_api:
    type: string
    description: The API endpoint to use for verifying `m.login.recaptcha` responses.
    default: "https://www.recaptcha.net/recaptcha/api/siteverify"
    examples:
      - "https://my.recaptcha.site"
  turn_uris:
    type: array
    description: The public URIs of the TURN server to give to clients.
    items:
      type: string
    default: []
    examples:
      - - "turn:example.org"
  turn_shared_secret:
    type: ["string", "null"]
    description: The shared secret used to compute passwords for the TURN server.
    default: null
    examples:
      - YOUR_SHARED_SECRET
  turn_shared_secret_path:
    type: ["string", "null"]
    description: >-
      An alternative to [`turn_shared_secret`](#turn_shared_secret): allows the
      shared secret to be specified in an external file.


      The file should be a plain text file, containing only the shared secret.
      Synapse reads the shared secret from the given file once at startup.


      _Added in Synapse 1.116.0._
    default: null
    examples:
      - /path/to/secrets/file
  turn_username:
    type: ["string", "null"]
    description: TURN server username if not using a token.
    default: null
    examples:
      - TURNSERVER_USERNAME
  turn_password:
    type: ["string", "null"]
    description: TURN server password if not using a token.
    default: null
    examples:
      - TURNSERVER_PASSWORD
  turn_user_lifetime:
    $ref: "#/$defs/duration"
    description: How long generated TURN credentials last.
    default: 1h
    examples:
      - 2h
  turn_allow_guests:
    type: boolean
    description: >-
      Whether guests should be allowed to use the TURN server. If false, VoIP
      will be unreliable for guests. However, it does introduce a slight
      security risk as it allows users to connect to arbitrary endpoints without
      having first signed up for a valid account (e.g. by passing a CAPTCHA).
    default: true
    examples:
      - false
  matrix_rtc:
    type: object 
    description: >-
      Options related to MatrixRTC.
    properties:
      transports:
        type: array
        items:
          type: object
          required:
            - type
          properties:
            type:
              type: string
              description: The type of transport to use to connect to the selective forwarding unit (SFU).
              example: livekit
            livekit_service_url:
              type: string
              description: >-
                The base URL of the LiveKit service. Should only be used with LiveKit-based transports.
              example: https://matrix-rtc.example.com/livekit/jwt
        description:
          A list of transport types and arguments to use for MatrixRTC connections.
        default: []
    default: {}
    examples:
      - transports:
        - type: livekit
          livekit_service_url: https://matrix-rtc.example.com/livekit/jwt
  enable_registration:
    type: boolean
    description: >-
      Enable registration for new users.


      It is highly recommended that if you enable registration, you set one or
      more or the following options, to avoid abuse of your server by "bots":


      * [`enable_registration_captcha`](#enable_registration_captcha)

      * [`registrations_require_3pid`](#registrations_require_3pid)

      * [`registration_requires_token`](#registration_requires_token)


      (In order to enable registration without any verification, you must also
      set
      [`enable_registration_without_verification`](#enable_registration_without_verification).)


      Note that even if this setting is disabled, new accounts can still be
      created via the admin API if
      [`registration_shared_secret`](#registration_shared_secret) is set.
    default: false
    examples:
      - true
  enable_registration_without_verification:
    type: boolean
    description: >-
      Enable registration without email or captcha verification. Note: this
      option is *not* recommended, as registration without verification is a
      known vector for spam and abuse. Has no effect unless
      [`enable_registration`](#enable_registration) is also enabled.
    default: false
    examples:
      - true
  registrations_require_3pid:
    type: array
    description: >-
      If this is set, users must provide all of the specified types of
      [3PID](https://spec.matrix.org/latest/appendices/#3pid-types) when
      registering an account.


      Note that [`enable_registration`](#enable_registration) must also be set
      to allow account registration.
    items:
      type: string
    default: []
    examples:
      - - email
        - msisdn
  disable_msisdn_registration:
    type: boolean
    description: >-
      Explicitly disable asking for MSISDNs from the registration flow
      (overrides `registrations_require_3pid` if MSISDNs are set as required).
    default: false
    examples:
      - true
  allowed_local_3pids:
    type: ["array", "null"]
    description: >-
      Mandate that users are only allowed to associate certain formats of 3PIDs
      with accounts on this server, as specified by the `medium` and `pattern`
      sub-options. `pattern` is a [Perl-like regular
      expression](https://docs.python.org/3/library/re.html#module-re).


      More information about 3PIDs, allowed `medium` types and their `address`
      syntax can be found [in the Matrix
      spec](https://spec.matrix.org/latest/appendices/#3pid-types).
    items:
      type: object
      description: Item allowing a given pattern for the specified 3PID medium.
      properties:
        medium:
          $ref: "#/$defs/3pidmedium"
          description: The medium for which to allow 3PID association.
        pattern:
          type: string
          description: >-
            A [Perl-like regular
            expression](https://docs.python.org/3/library/re.html#module-re)
            allowing association of a 3PID to a local account if it matches the
            given format.
    default: null
    examples:
      - - medium: email
          pattern: "^[^@]+@matrix\\.org$"
        - medium: email
          pattern: "^[^@]+@vector\\.im$"
        - medium: msisdn
          pattern: "^44\\d{10}$"
  enable_3pid_lookup:
    type: boolean
    description: Enable 3PIDs lookup requests to identity servers from this server.
    default: true
    examples:
      - false
  registration_requires_token:
    type: boolean
    description: >-
      Require users to submit a token during registration. Tokens can be managed
      using the admin [API](../administration/admin_api/registration_tokens.md).
      Disabling this option will not delete any tokens previously generated.


      Note that [`enable_registration`](#enable_registration) must also be set
      to allow account registration.
    default: false
    examples:
      - true
  registration_shared_secret:
    type: ["string", "null"]
    description: >-
      If set, allows registration of standard or admin accounts by anyone who
      has the shared secret, even if
      [`enable_registration`](#enable_registration) is not set.


      This is primarily intended for use with the `register_new_matrix_user`
      script (see [Registering a
      user](../../setup/installation.md#registering-a-user)); however, the
      interface is [documented](../../admin_api/register_api.html).


      Replacing an existing `registration_shared_secret` with a new one requires
      users of the [Shared-Secret Registration
      API](../../admin_api/register_api.html) to start using the new secret for
      requesting any further one-time nonces.


      > ⚠️ **Warning** – The additional consequences of replacing
      [`macaroon_secret_key`](#macaroon_secret_key) will apply in case it
      delegates to `registration_shared_secret`.


      See also
      [`registration_shared_secret_path`](#registration_shared_secret_path).
    default: null
    examples:
      - "<PRIVATE STRING>"
  registration_shared_secret_path:
    type: ["string", "null"]
    description: >-
      An alternative to
      [`registration_shared_secret`](#registration_shared_secret): allows the
      shared secret to be specified in an external file.


      The file should be a plain text file, containing only the shared secret.


      If this file does not exist, Synapse will create a new shared secret on
      startup and store it in this file.


      _Added in Synapse 1.67.0._
    default: null
    examples:
      - /path/to/secrets/file
  bcrypt_rounds:
    type: integer
    description: >-
      Set the number of bcrypt rounds used to generate password hash. Larger
      numbers increase the work factor needed to generate the hash. The default
      number is 12 (which equates to 2^12 rounds). N.B. that increasing this
      will exponentially increase the time required to register or login - e.g.
      24 => 2^24 rounds which will take >20 mins.
    default: 12
    examples:
      - 14
  allow_guest_access:
    type: boolean
    description: >-
      Allows users to register as guests without a password/email/etc, and
      participate in rooms hosted on this server which have been made accessible
      to anonymous users.
    default: false
    examples:
      - true
  default_identity_server:
    type: ["string", "null"]
    description: >-
      The identity server which we suggest that clients should use when users
      log in on this server.


      (By default, no suggestion is made, so it is left up to the client. This
      setting is ignored unless `public_baseurl` is also explicitly set.)
    default: null
    examples:
      - "https://matrix.org"
  account_threepid_delegates:
    type: object
    properties:
      msisdn:
        type: ["string", "null"]
        description: Identity server base URI for MSISDN (phone numbers). See above.
    description: >-
      Delegate verification of phone numbers to an identity server.


      When a user wishes to add a phone number to their account, we need to
      verify that they actually own that phone number, which requires sending
      them a text message (SMS). Currently Synapse does not support sending
      those texts itself and instead delegates the task to an identity server.
      The base URI for the identity server to be used is specified by the
      `account_threepid_delegates.msisdn` option.


      If this is left unspecified, Synapse will not allow users to add phone
      numbers to their account.


      (Servers handling the these requests must answer the `/requestToken`
      endpoints defined by the Matrix Identity Service API
      [specification](https://matrix.org/docs/spec/identity_service/latest).)


      *Deprecated in Synapse 1.64.0*: The `email` option is deprecated.


      *Removed in Synapse 1.66.0*: The `email` option has been removed. If
      present, Synapse will report a configuration error on startup.
    default: {}
    examples:
      - msisdn: "http://localhost:8090"
  enable_set_displayname:
    type: boolean
    description: >-
      Whether users are allowed to change their displayname after it has been
      initially set. Useful when provisioning users based on the contents of a
      third-party directory.


      Does not apply to server administrators.
    default: true
    examples:
      - false
  enable_set_avatar_url:
    type: boolean
    description: >-
      Whether users are allowed to change their avatar after it has been
      initially set. Useful when provisioning users based on the contents of a
      third-party directory.


      Does not apply to server administrators.
    default: true
    examples:
      - false
  enable_3pid_changes:
    type: boolean
    description: >-
      Whether users can change the third-party IDs associated with their
      accounts (email address and msisdn).
    default: true
    examples:
      - false
  auto_join_rooms:
    type: array
    description: >-
      Users who register on this homeserver will automatically be joined to the
      rooms listed under this option.


      By default, any room aliases included in this list will be created as a
      publicly joinable room when the first user registers for the homeserver.
      If the room already exists, make certain it is a publicly joinable room,
      i.e. the join rule of the room must be set to `public`. You can find more
      options relating to auto-joining rooms below.


      As Spaces are just rooms under the hood, Space aliases may also be used.
    items:
      type: string
    default: []
    examples:
      - - "#exampleroom:example.com"
        - "#anotherexampleroom:example.com"
  autocreate_auto_join_rooms:
    type: boolean
    description: >-
      Where `auto_join_rooms` are specified, setting this flag ensures that the
      rooms exist by creating them when the first user on the homeserver
      registers. This option will not create Spaces.


      By default the auto-created rooms are publicly joinable from any federated
      server. Use the `autocreate_auto_join_rooms_federated` and
      `autocreate_auto_join_room_preset` settings to customise this behaviour.


      Setting to false means that if the rooms are not manually created, users
      cannot be auto-joined since they do not exist.
    default: true
    examples:
      - false
  autocreate_auto_join_rooms_federated:
    type: boolean
    description: >-
      Whether the rooms listed in `auto_join_rooms` that are auto-created are
      available via federation. Only has an effect if
      `autocreate_auto_join_rooms` is true.


      Note that whether a room is federated cannot be modified after creation.


      If true, the room will be joinable from other servers. If false, users
      from other homeservers are prevented from joining these rooms.
    default: true
    examples:
      - false
  autocreate_auto_join_room_preset:
    type: string
    description: >-
      The room preset to use when auto-creating one of `auto_join_rooms`. Only
      has an effect if `autocreate_auto_join_rooms` is true.


      Possible values for this option are:

      * "public_chat": the room is joinable by anyone, including federated
      servers if `autocreate_auto_join_rooms_federated` is true (the default).

      * "private_chat": an invitation is required to join these rooms.

      * "trusted_private_chat": an invitation is required to join this room and
      the invitee is assigned a power level of 100 upon joining the room.


      Each preset will set up a room in the same manner as if it were provided
      as the `preset` parameter when calling the [`POST
      /_matrix/client/v3/createRoom`](https://spec.matrix.org/latest/client-server-api/#post_matrixclientv3createroom)
      Client-Server API endpoint.


      If a value of "private_chat" or "trusted_private_chat" is used then
      `auto_join_mxid_localpart` must also be configured.
    enum:
      - public_chat
      - private_chat
      - trusted_private_chat
    default: public_chat
    examples:
      - private_chat
  auto_join_mxid_localpart:
    type: ["string", "null"]
    description: >-
      The local part of the user id which is used to create `auto_join_rooms` if
      `autocreate_auto_join_rooms` is true. If this is not provided then the
      initial user account that registers will be used to create the rooms.


      The user id is also used to invite new users to any auto-join rooms which
      are set to invite-only.


      It *must* be configured if `autocreate_auto_join_room_preset` is set to
      "private_chat" or "trusted_private_chat".


      Note that this must be specified in order for new users to be correctly
      invited to any auto-join rooms which have been set to invite-only (either
      at the time of creation or subsequently).


      Note that, if the room already exists, this user must be joined and have
      the appropriate permissions to invite new members.
    default: null
    examples:
      - system
  auto_join_rooms_for_guests:
    type: boolean
    description: >-
      When `auto_join_rooms` is specified, setting this flag to false prevents
      guest accounts from being automatically joined to the rooms.
    default: true
    examples:
      - false
  inhibit_user_in_use_error:
    type: boolean
    description: >-
      Whether to inhibit errors raised when registering a new account if the
      user ID already exists. If turned on, requests to `/register/available`
      will always show a user ID as available, and Synapse won't raise an error
      when starting a registration with a user ID that already exists. However,
      Synapse will still raise an error if the registration completes and the
      username conflicts.
    default: false
    examples:
      - true
  allow_underscore_prefixed_registration:
    type: boolean
    description: >-
      Whether users are allowed to register with a underscore-prefixed
      localpart. By default, AppServices use prefixes like `_example` to
      namespace their associated ghost users. If turned on, this may result in
      clashes or confusion. Useful when provisioning users from an external
      identity provider.
    default: false
    examples:
      - true
  session_lifetime:
    $ref: "#/$defs/duration"
    description: >-
      Time that a user's session remains valid for, after they log in.


      Note that this is not currently compatible with guest logins.


      Note also that this is calculated at login time: changes are not applied
      retrospectively to users who have already logged in.
    default: infinity
    examples:
      - 24h
  refreshable_access_token_lifetime:
    $ref: "#/$defs/duration"
    description: >-
      Time that an access token remains valid for, if the session is using
      refresh tokens.


      For more information about refresh tokens, please see the
      [manual](user_authentication/refresh_tokens.md).


      Note that this only applies to clients which advertise support for refresh
      tokens.


      Note also that this is calculated at login time and refresh time: changes
      are not applied to existing sessions until they are refreshed.
    default: 5m
    examples:
      - 10m
  refresh_token_lifetime:
    $ref: "#/$defs/duration"
    description: >-
      Time that a refresh token remains valid for (provided that it is not
      exchanged for another one first). This option can be used to automatically
      log-out inactive sessions. Please see the manual for more information.


      Note also that this is calculated at login time and refresh time: changes
      are not applied to existing sessions until they are refreshed.
    default: infinity
    examples:
      - 24h
  nonrefreshable_access_token_lifetime:
    $ref: "#/$defs/duration"
    description: >-
      Time that an access token remains valid for, if the session is NOT using
      refresh tokens.


      Please note that not all clients support refresh tokens, so setting this
      to a short value may be inconvenient for some users who will then be
      logged out frequently.


      Note also that this is calculated at login time: changes are not applied
      retrospectively to existing sessions for users that have already logged
      in.
    default: infinity
    examples:
      - 24h
  ui_auth:
    oneOf:
      - $ref: "#/$defs/duration"
      - type: object
        properties:
          session_timeout:
            $ref: "#/$defs/duration"
    description: >-
      The amount of time to allow a user-interactive authentication session to
      be active.


      This defaults to 0, meaning the user is queried for their credentials
      before every action, but this can be overridden to allow a single
      validation to be re-used. This weakens the protections afforded by the
      user-interactive authentication process, by allowing for multiple (and
      potentially different) operations to use the same validation session.


      This is ignored for potentially "dangerous" operations (including
      deactivating an account, modifying an account password, adding a 3PID, and
      minting additional login tokens).


      Use the `session_timeout` sub-option here to change the time allowed for
      credential validation.
    default: 0
    examples:
      - session_timeout: 15s
  login_via_existing_session:
    type: object
    description: >-
      Matrix supports the ability of an existing session to mint a login token
      for another client.


      Synapse disables this by default as it has security ramifications – a
      malicious client could use the mechanism to spawn more than one session.
    properties:
      enabled:
        type: boolean
        description: "Enable login via existing session."
        default: false
      require_ui_auth:
        type: boolean
        description: Require user-interactive authentication.
        default: true
      token_timeout:
        $ref: "#/$defs/duration"
        description: Duration of time the generated token is valid.
        default: 5m
    examples:
      - enabled: true
        require_ui_auth: false
        token_timeout: 5m
  enable_metrics:
    type: boolean
    description: Set to true to enable collection and rendering of performance metrics.
    default: false
    examples:
      - true
  sentry:
    type: object
    description: >-
      Use this option to enable sentry integration. Provide the DSN assigned to
      you by sentry with the `dsn` setting.


      An optional `environment` field can be used to specify an environment.
      This allows for log maintenance based on different environments, ensuring
      better organization and analysis.


      NOTE: While attempts are made to ensure that the logs don't contain any
      sensitive information, this cannot be guaranteed. By enabling this option
      the sentry server may therefore receive sensitive information, and it in
      turn may then disseminate sensitive information through insecure
      notification channels if so configured.
    properties:
      dsn:
        type: ["string", "null"]
        description: >-
          The DSN assigned by sentry. If unset or null, sentry integration is
          disabled.
        default: null
      environment:
        type: ["string", "null"]
        description: Sentry environment.
        default: null
    examples:
      - environment: production
        dsn: ...
  metrics_flags:
    type: object
    description: >-
      Flags to enable Prometheus metrics which are not suitable to be enabled by
      default, either for performance reasons or limited use. Currently the only
      option is `known_servers`.
    properties:
      known_servers:
        type: boolean
        description: >-
          Publishes `synapse_federation_known_servers`, a gauge of the number of
          servers this homeserver knows about, including itself. May cause
          performance problems on large homeservers.
        default: false
    examples:
      - known_servers: true
  report_stats:
    type: boolean
    description: >-
      Whether or not to report homeserver usage statistics. This is originally
      set when generating the config. Set this option to true or false to change
      the current behavior. See [Reporting Homeserver Usage
      Statistics](../administration/monitoring/reporting_homeserver_usage_statistics.md)
      for information on what data is reported.


      Statistics will be reported 5 minutes after Synapse starts, and then every
      3 hours after that.
    default: false
    examples:
      - true
  report_stats_endpoint:
    type: string
    description: The endpoint to report homeserver usage statistics to.
    default: https://matrix.org/report-usage-stats/push
    examples:
      - https://example.com/report-usage-stats/push
  room_prejoin_state:
    type: object
    description: >-
      This setting controls the state that is shared with users upon receiving
      an invite to a room, or in reply to a knock on a room. By default, the
      following state events are shared with users:


      - `m.room.join_rules`

      - `m.room.canonical_alias`

      - `m.room.avatar`

      - `m.room.encryption`

      - `m.room.name`

      - `m.room.create`

      - `m.room.topic`


      *Changed in Synapse 1.74:* admins can filter the events in prejoin state
      based on their state key.
    properties:
      disable_default_event_types:
        type: boolean
        description: >-
          Set to `true` to disable the above defaults. If this is enabled, only
          the event types listed in `additional_event_types` are shared.
        default: false
      additional_event_types:
        type: array
        description: >-
          A list of additional state events to include in the events to be
          shared. By default, this list is empty (so only the default event
          types are shared).


          Each entry in this list should be either a single string or a list of
          two strings.

          * A standalone string `t` represents all events with type `t` (i.e.
          with no restrictions on state keys).

          * A pair of strings `[t, s]` represents a single event with type `t`
          and state key `s`. The same type can appear in two entries with
          different state keys: in this situation, both state keys are included
          in prejoin state.
        items:
          type: ["string", "array"]
          items:
            type: string
        default: []
    examples:
      - disable_default_event_types: false
        additional_event_types:
          - org.example.custom.event.typeA
          - - org.example.custom.event.typeB
            - foo
          - - org.example.custom.event.typeC
            - bar
          - - org.example.custom.event.typeC
            - baz
  track_puppeted_user_ips:
    type: boolean
    description: >-
      We record the IP address of clients used to access the API for various
      reasons, including displaying it to the user in the "Where you're signed
      in" dialog.


      By default, when puppeting another user via the admin API, the client IP
      address is recorded against the user who created the access token (ie, the
      admin user), and *not* the puppeted user.


      Set this option to true to also record the IP address against the puppeted
      user. (This also means that the puppeted user will count as an "active"
      user for the purpose of monthly active user tracking – see
      `limit_usage_by_mau` etc above.)
    default: false
    examples:
      - true
  app_service_config_files:
    type: array
    description: A list of application service config files to use.
    items:
      type: string
    default: []
    examples:
      - - app_service_1.yaml
        - app_service_2.yaml
  track_appservice_user_ips:
    type: boolean
    description: >-
      Set to true to enable tracking of application service IP addresses.
      Implicitly enables MAU tracking for application service users.
    default: false
    examples:
      - true
  use_appservice_legacy_authorization:
    type: boolean
    description: >-
      Whether to send the application service access tokens via the
      `access_token` query parameter per older versions of the Matrix
      specification. Defaults to false. Set to true to enable sending access
      tokens via a query parameter.


      **Enabling this option is considered insecure and is not recommended.**
    default: false
    examples:
      - true
  macaroon_secret_key:
    type: ["string", "null"]
    description: >-
      A secret which is used to sign

      - access token for guest users,

      - short-term login token used during SSO logins (OIDC or SAML2) and

      - token used for unsubscribing from email notifications.


      If none is specified, the `registration_shared_secret` is used, if one is
      given; otherwise, a secret key is derived from the signing key.


      > ⚠️ **Warning** – Replacing an existing `macaroon_secret_key` with a new
      one will lead to invalidation of access tokens for all guest users. It
      will also break unsubscribe links in emails sent before the change. An
      unlucky user might encounter a broken SSO login flow and would have to
      start again.
    default: null
    examples:
      - "<PRIVATE STRING>"
  macaroon_secret_key_path:
    type: ["string", "null"]
    description: >-
      An alternative to [`macaroon_secret_key`](#macaroon_secret_key): allows
      the secret key to be specified in an external file.


      The file should be a plain text file, containing only the secret key.
      Synapse reads the secret key from the given file once at startup.


      _Added in Synapse 1.121.0._
    default: null
    examples:
      - /path/to/secrets/file
  form_secret:
    type: ["string", "null"]
    description: >-
      A secret which is used to calculate HMACs for form values, to stop
      falsification of values. Must be specified for the User Consent forms to
      work.


      Replacing an existing `form_secret` with a new one might break the user
      consent page for an unlucky user and require them to reopen the page from
      a new link.
    default: null
    examples:
      - "<PRIVATE STRING>"
  form_secret_path:
    type: ["string", "null"]
    description: >-
      An alternative to [`form_secret`](#form_secret): allows the secret to be
      specified in an external file.


      The file should be a plain text file, containing only the secret. Synapse
      reads the secret from the given file once at startup.


      _Added in Synapse 1.126.0._
    default: null
    examples:
      - /path/to/secrets/file
  signing_key_path:
    type: ["string", "null"]
    description: >-
      Path to the signing key to sign events and federation requests with.


      *New in Synapse 1.67*: If this file does not exist, Synapse will create a
      new signing key on startup and store it in this file.
    default: null
    examples:
      - CONFDIR/SERVERNAME.signing.key
  old_signing_keys:
    type: object
    description: >-
      The keys that the server used to sign messages with but won't use to sign
      new messages.


      It is possible to build an entry from an old `signing.key` file using the
      `export_signing_key` script which is provided with synapse.


      If you have lost the private key file, you can ask another server you
      trust to tell you the public keys it has seen from your server. To fetch
      the keys from `matrix.org`, try something like:


      ```

      curl https://matrix-federation.matrix.org/_matrix/key/v2/query/myserver.example.com |
        jq '.server_keys | map(.verify_keys) | add'
      ```
    additionalProperties:
      type: object
      properties:
        key:
          type: string
          description: The base64-encoded public key.
        expired_ts:
          type: integer
          description: >-
            Time, in milliseconds since the unix epoch, that the key was last used.
    default: {}
    examples:
      - "ed25519:id":
          key: base64string
          expired_ts: 123456789123
  key_refresh_interval:
    $ref: "#/$defs/duration"
    description: >-
      How long key response published by this server is valid for. Used to set the
      `valid_until_ts` in `/key/v2` APIs. Determines how quickly servers will query to
      check which keys are still valid.
    default: 1d
    examples:
      - 2d
  trusted_key_servers:
    type: array
    description: >-
      The trusted servers to download signing keys from.


      When we need to fetch a signing key, each server is tried in parallel.


      Normally, the connection to the key server is validated via TLS
      certificates. Additional security can be provided by configuring a `verify
      key`, which will make synapse check that the response is signed by that
      key.


      This setting supersedes an older setting named `perspectives`. The old
      format is still supported for backwards-compatibility, but it is
      deprecated.


      `trusted_key_servers` defaults to matrix.org, but using it will generate a
      warning on start-up. To suppress this warning, set
      `suppress_key_server_warning` to true.


      If the use of a trusted key server has to be deactivated, e.g. in a
      private federation or for privacy reasons, this can be realised by setting
      an empty array (`trusted_key_servers: []`). Then Synapse will request the
      keys directly from the server that owns the keys. If Synapse does not get
      keys directly from the server, the events of this server will be rejected.
    items:
      server_name:
        type: string
        description: The name of the server. Required.
      verify_keys:
        type: ["object", "null"]
        description: >-
          An optional map from key id to base64-encoded public key. If
          specified, we will check that the response is signed by at least one
          of the given keys.
        additionalProperties:
          type: string
      accept_keys_insecurely:
        type: boolean
        description: >-
          Normally, if `verify_keys` is unset, and
          `federation_verify_certificates` is not `true`, synapse will refuse to
          start, because this would allow anyone who can spoof DNS responses to
          masquerade as the trusted key server. If you know what you are doing
          and are sure that your network environment provides a secure
          connection to the key server, you can set this to `true` to override
          this behaviour.
    default:
      - server_name: matrix.org
    examples:
      - - server_name: my_trusted_server.example.com
          verify_keys:
            "ed25519:auto": abcdefghijklmnopqrstuvwxyzabcdefghijklmopqr
        - server_name: my_other_trusted_server.example.com
      - - server_name: matrix.org
  suppress_key_server_warning:
    type: boolean
    description: >-
      Set the following to true to disable the warning that is emitted when the
      `trusted_key_servers` include "matrix.org". See above.
    default: false
    examples:
      - true
  key_server_signing_keys_path:
    type: ["string", "null"]
    description: >-
      The signing keys to use when acting as a trusted key server. If not
      specified defaults to the server signing key.


      Can contain multiple keys, one per line.
    default: null
    examples:
      - key_server_signing_keys.key
  saml2_config:
    type: object
    description: >-
      Enable SAML2 for registration and login. Uses pysaml2. To learn more about
      pysaml and to find a full list options for configuring pysaml, read the
      docs [here](https://pysaml2.readthedocs.io/en/latest/).


      At least one of `sp_config` or `config_path` must be set in this section
      to enable SAML login. You can either put your entire pysaml config inline
      using the `sp_config` option, or you can specify a path to a psyaml config
      file with the sub-option `config_path`.


      Once SAML support is enabled, a metadata file will be exposed at
      `https://<server>:<port>/_synapse/client/saml2/metadata.xml`, which you
      may be able to use to configure your SAML IdP with. Alternatively, you can
      manually configure the IdP to use an ACS location of
      `https://<server>:<port>/_synapse/client/saml2/authn_response`.
    properties:
      idp_name:
        type: string
        description: >-
          A user-facing name for this identity provider, which is used to offer
          the user a choice of login mechanisms.
      idp_icon:
        type: ["string", "null"]
        description: >-
          An optional icon for this identity provider, which is presented by
          clients and Synapse's own IdP picker page. If given, must be an MXC
          URI of the format `mxc://<server-name>/<media-id>`. (An easy way to
          obtain such an MXC URI is to upload an image to an (unencrypted) room
          and then copy the URL from the source of the event.)
      idp_brand:
        description: >-
          An optional brand for this identity provider, allowing clients to
          style the login flow according to the identity provider in question.
          See the [spec](https://spec.matrix.org/latest/) for possible options
          here.
      sp_config:
        type: ["object", "null"]
        description: >-
          Configuration for the pysaml2 Service Provider. See pysaml2 docs for
          format of config. Default values will be used for the `entityid` and
          `service` settings, so it is not normally necessary to specify them
          unless you need to override them. Here are a few useful sub-options
          for configuring pysaml:

          * `metadata`: Point this to the IdP's metadata. You must provide
          either a local file via the `local` attribute or (preferably) a URL
          via the `remote` attribute.

          * `accepted_time_diff: 3`: Allowed clock difference in seconds between
          the homeserver and IdP. Defaults to 0.

          * `service`: By default, the user has to go to our login page first.
          If you'd like to allow IdP-initiated login, set `allow_unsolicited` to
          true under `sp` in the `service` section.
        default: null
      config_path:
        type: ["string", "null"]
        description: Specify a separate pysaml2 configuration file.
        default: null
      saml_session_lifetime:
        $ref: "#/$defs/duration"
        description: >-
          The lifetime of a SAML session. This defines how long a user has to
          complete the authentication process, if `allow_unsolicited` is unset.
        default: 15m
      user_mapping_provider:
        type: object
        description: >-
          Using this option, an external module can be provided as a custom
          solution to mapping attributes returned from a saml provider onto a
          matrix user.
        properties:
          module:
            type: string
            description: The custom module's class.
          config:
            type: object
            description: >-
              Custom configuration values for the module. Use the values
              provided in the example if you are using the built-in
              user_mapping_provider, or provide your own config values for a
              custom class if you are using one. This section will be passed as
              a Python dictionary to the module's `parse_config` method. The
              built-in provider takes the following two options:

              * `mxid_source_attribute`: The SAML attribute (after mapping via
              the attribute maps) to use to derive the Matrix ID from. It is
              "uid" by default. Note: This used to be configured by the
              `saml2_config.mxid_source_attribute option`. If that is still
              defined, its value will be used instead.

              * `mxid_mapping`: The mapping system to use for mapping the saml
              attribute onto a matrix ID. Options include: `hexencode` (which
              maps unpermitted characters to `=xx`) and `dotreplace` (which
              replaces unpermitted characters with `.`). The default is
              `hexencode`. Note: This used to be configured by the
              `saml2_config.mxid_mapping option`. If that is still defined, its
              value will be used instead.
      grandfathered_mxid_source_attribute:
        type: string
        description: >-
          In previous versions of synapse, the mapping from SAML attribute to
          MXID was always calculated dynamically rather than stored in a table.
          For backwards-compatibility, we will look for `user_ids` matching such
          a pattern before creating a new account. This setting controls the
          SAML attribute which will be used for this backwards-compatibility
          lookup. Typically it should be "uid", but if the attribute maps are
          changed, it may be necessary to change it.
        default: uid
      attribute_requirements:
        type: array
        description: >-
          It is possible to configure Synapse to only allow logins if SAML
          attributes match particular values. The requirements can be listed
          under `attribute_requirements` as shown in the example. All of the
          listed attributes must match for the login to be permitted. Values can
          be specified in a `one_of` list to allow multiple values for an
          attribute.
        items:
          type: object
          description: Item allowing a specific SAML attribute.
          properties:
            attribute:
              type: string
              description: SAML attribute for which to allow logins.
            value:
              type: string
              description: Value the SAML attribute must match.
            one_of:
              type: array
              description: List of values the SAML attribute must all match.
              items:
                type: string
          required:
            - attribute
      idp_entityid:
        type: ["string", "null"]
        description: >-
          If the metadata XML contains multiple IdP entities then the
          `idp_entityid` option must be set to the entity to redirect users to.
          Most deployments only have a single IdP entity and so should omit this
          option.
        default: null
    examples:
      - sp_config:
          metadata:
            local:
              - saml2/idp.xml
            remote:
              - url: "https://our_idp/metadata.xml"
          accepted_time_diff: 3
          service:
            sp:
              allow_unsolicited: true
          description:
            - My awesome SP
            - en
          name:
            - Test SP
            - en
          ui_info:
            display_name:
              - lang: en
                text: Display Name is the descriptive name of your service.
            description:
              - lang: en
                text: >-
                  Description should be a short paragraph explaining the purpose
                  of the service.
            information_url:
              - lang: en
                text: "https://example.com/terms-of-service"
            privacy_statement_url:
              - lang: en
                text: "https://example.com/privacy-policy"
            keywords:
              - lang: en
                text:
                  - Matrix
                  - Element
            logo:
              - lang: en
                text: "https://example.com/logo.svg"
                width: "200"
                height: "80"
          organization:
            name: Example com
            display_name:
              - - Example co
                - en
            url: "http://example.com"
          contact_person:
            - given_name: Bob
              sur_name: the Sysadmin
              email_address:
                - admin@example.com
              contact_type: technical
        saml_session_lifetime: 5m
        user_mapping_provider:
          config:
            mxid_source_attribute: displayName
            mxid_mapping: dotreplace
        grandfathered_mxid_source_attribute: upn
        attribute_requirements:
          - attribute: userGroup
            value: staff
          - attribute: department
            one_of:
              - sales
              - admins
        idp_entityid: "https://our_idp/entityid"
  oidc_providers:
    type: array
    description: >-
      List of OpenID Connect (OIDC) / OAuth 2.0 identity providers, for
      registration and login. See [here](../../openid.md) for information on how
      to configure these options.


      For backwards compatibility, it is also possible to configure a single
      OIDC provider via an `oidc_config` setting. This is now deprecated and
      admins are advised to migrate to the `oidc_providers` format. (When doing
      that migration, use `oidc` for the `idp_id` to ensure that existing users
      continue to be recognised.)


      It is possible to configure Synapse to only allow logins if certain
      attributes match particular values in the OIDC userinfo. The requirements
      can be listed under `attribute_requirements` as shown here:

      ```yaml

      attribute_requirements:
        - attribute: family_name
          one_of: ["Stephensson", "Smith"]
        - attribute: groups
          value: "admin"
        # If `value` or `one_of` are not specified, the attribute only needs
        # to exist, regardless of value.
        - attribute: picture
      ```


      `attribute` is a required field, while `value` and `one_of` are optional.


      All of the listed attributes must match for the login to be permitted.
      Additional attributes can be added to userinfo by expanding the `scopes`
      section of the OIDC config to retrieve additional information from the
      OIDC provider.


      If the OIDC claim is a list, then the attribute must match any value in
      the list. Otherwise, it must exactly match the value of the claim. Using
      the example above, the `family_name` claim MUST be either "Stephensson" or
      "Smith", but the `groups` claim MUST contain "admin".
    items:
      type: object
      properties:
        idp_id:
          type: string
          description: >-
            A unique identifier for this identity provider. Used internally by
            Synapse; should be a single word such as "github". Note that, if
            this is changed, users authenticating via that provider will no
            longer be recognised as the same user! (Use "oidc" here if you are
            migrating from an old `oidc_config` configuration.)
        idp_name:
          type: string
          description: >-
            A user-facing name for this identity provider, which is used to
            offer the user a choice of login mechanisms.
        idp_icon:
          type: string
          description: >-
            An optional icon for this identity provider, which is presented by
            clients and Synapse's own IdP picker page. If given, must be an MXC
            URI of the format `mxc://<server-name>/<media-id>`. (An easy way to
            obtain such an MXC URI is to upload an image to an (unencrypted)
            room and then copy the URL from the source of the event.)
        idp_brand:
          type: string
          description: >-
            An optional brand for this identity provider, allowing clients to
            style the login flow according to the identity provider in question.
            See the [spec](https://spec.matrix.org/latest/) for possible options
            here.
        discover:
          type: boolean
          description: >-
            Set to false to disable the use of the OIDC discovery mechanism to
            discover endpoints. Defaults to true.
        issuer:
          type: string
          description: >-
            Required. The OIDC issuer. Used to validate tokens and (if discovery
            is enabled) to discover the provider's endpoints.
        client_id:
          type: string
          description: Required. OAuth2 client id to use.
        client_secret:
          type: ["string", "null"]
          description: >-
            OAuth2 client secret to use. May be omitted if
            `client_secret_jwt_key` is given, or if `client_auth_method` is
            `none`. Must be omitted if `client_secret_path` is specified.
        client_secret_path:
          type: ["string", "null"]
          description: >-
            Path to the OAuth2 client secret to use. With that it's not
            necessary to leak secrets into the config file itself. Mutually
            exclusive with `client_secret`. Can be omitted if
            `client_secret_jwt_key` is specified.


            *Added in Synapse 1.91.0.*
        client_secret_jwt_key:
          type: ["object", "null"]
          description: >-
            Alternative to client_secret: details of a key used to create a JSON
            Web Token to be used as an OAuth2 client secret.
          properties:
            key:
              type: ["string", "null"]
              description: >-
                A pem-encoded signing key. Must be a suitable key for the
                algorithm specified. Required unless `key_file` is given.
            key_file:
              type: ["string", "null"]
              description: >-
                Path to the file containing a pem-encoded signing key. Required
                unless `key` is given.
            jwt_header:
              type: object
              description: >-
                Dictionary giving properties to include in the JWT header. Must
                include the key `alg`.
              properties:
                alg:
                  type: string
                  description: >-
                    Algorithm used to sign the JWT, such as ES256, using the JWA
                    identifiers in RFC7518.
            jwt_payload:
              type: object
              description: >-
                Optional dictionary giving properties to include in the JWT
                payload. Normally this should include an `iss` key.
        client_auth_method:
          type: ["string", "null"]
          enum:
            - client_secret_basic
            - client_secret_post
            - none
            - null
          description: >-
            Auth method to use when exchanging the token. Valid values are
            `client_secret_basic` (default), `client_secret_post` and `none`.
        pkce_method:
          type: ["string", "null"]
          enum:
            - auto
            - always
            - never
            - null
          description: >-
            Whether to use proof key for code exchange when requesting and
            exchanging the token. Valid values are: `auto`, `always`, or
            `never`. Defaults to `auto`, which uses PKCE if supported during
            metadata discovery. Set to `always` to force enable PKCE or `never`
            to force disable PKCE.
        id_token_signing_alg_values_supported:
          type: array
          description: >-
            List of the JWS signing algorithms (`alg` values) that are supported
            for signing the `id_token`.


            This is *not* required if `discovery` is disabled. We default to
            supporting `RS256` in the downstream usage if no algorithms are
            configured here or in the discovery document.


            According to the spec, the algorithm `"RS256"` MUST be included. The
            absolute rigid approach would be to reject this provider as
            non-compliant if it's not included but we simply allow whatever and
            see what happens (you're the one that configured the value and
            cooperating with the identity provider).


            The `alg` value `"none"` MAY be supported but can only be used if
            the Authorization Endpoint does not include `id_token` in the
            `response_type` (ex. `/authorize?response_type=code` where `none`
            can apply, `/authorize?response_type=code%20id_token` where `none`
            can't apply) (such as when using the Authorization Code Flow).
          items:
            type: string
        scopes:
          type: ["array", "null"]
          description: >-
            List of scopes to request. This should normally include the "openid"
            scope. Defaults to `["openid"]`.
          items:
            type: string
        authorization_endpoint:
          type: string
          description: >-
            The OAuth2 authorization endpoint. Required if provider discovery is
            disabled.
        token_endpoint:
          type: string
          description: >-
            The OAuth2 token endpoint. Required if provider discovery is disabled.
        userinfo_endpoint:
          type: string
          description: >-
            The OIDC userinfo endpoint. Required if discovery is disabled and
            the "openid" scope is not requested.
        jwks_uri:
          type: string
          description: >-
            URI where to fetch the JWKS. Required if discovery is disabled and
            the "openid" scope is used.
        skip_verification:
          type: boolean
          description: >-
            Set to `true` to skip metadata verification. Use this if you are
            connecting to a provider that is not OpenID Connect compliant.
            Defaults to false. Avoid this in production.
        user_profile_method:
          type: ["string", "null"]
          enum:
            - auto
            - userinfo_endpoint
            - null
          description: >-
            Whether to fetch the user profile from the userinfo endpoint, or to
            rely on the data returned in the id_token from the `token_endpoint`.
            Valid values are: `auto` or `userinfo_endpoint`. Defaults to `auto`,
            which uses the userinfo endpoint if `openid` is not included in
            `scopes`. Set to `userinfo_endpoint` to always use the userinfo
            endpoint.
        redirect_uri:
          type: ["string", "null"]
          description: >-
            An optional string, that if set will override the `redirect_uri`
            parameter sent in the requests to the authorization and token
            endpoints. Useful if you want to redirect the client to another
            endpoint as part of the OIDC login. Be aware that the client must
            then call Synapse's OIDC callback URL
            (`<public_baseurl>/_synapse/client/oidc/callback`) manually
            afterwards. Must be a valid URL including scheme and path.
        additional_authorization_parameters:
          type: object
          description: >-
            String to string dictionary that will be passed as additional
            parameters to the authorization grant URL.
          additionalProperties:
            type: string
        passthrough_authorization_parameters:
          type: array
          description: >-
            List of parameters that will be passed through from the redirect
            endpoint to the authorization grant URL.
          items:
            type: string
        allow_existing_users:
          type: boolean
          description: >-
            Set to true to allow a user logging in via OIDC to match a
            pre-existing account instead of failing. This could be used if
            switching from password logins to OIDC. Defaults to false.
        enable_registration:
          type: boolean
          description: >-
            Set to `false` to disable automatic registration of new users. This
            allows the OIDC SSO flow to be limited to sign in only, rather than
            automatically registering users that have a valid SSO login but do
            not have a pre-registered account. Defaults to true.
        user_mapping_provider:
          type: object
          description: >-
            Configuration for how attributes returned from a OIDC provider are
            mapped onto a matrix user.


            When rendering, the Jinja2 templates are given a `user` variable,
            which is set to the claims returned by the UserInfo Endpoint and/or
            in the ID Token.
          properties:
            module:
              type: string
              description: >-
                The class name of a custom mapping module. Default is
                `synapse.handlers.oidc.JinjaOidcMappingProvider`. See [OpenID
                Mapping
                Providers](../../sso_mapping_providers.md#openid-mapping-providers)
                for information on implementing a custom mapping provider.
            config:
              type: object
              description: >-
                Configuration for the mapping provider module. This section will
                be passed as a Python dictionary to the user mapping provider
                module's `parse_config` method.


                For the default provider, the following settings are available:


                * `subject_template`: Jinja2 template for a unique identifier
                for the user. Defaults to `{{ user.sub }}`, which OpenID Connect
                compliant providers should provide.

                  This replaces and overrides `subject_claim`.

                * `subject_claim`: name of the claim containing a unique
                identifier for the user. Defaults to `sub`, which OpenID Connect
                compliant providers should provide.

                  *Deprecated in Synapse v1.75.0.*

                * `picture_template`: Jinja2 template for an url for the user's
                profile picture. Defaults to `{{ user.picture }}`, which OpenID
                Connect compliant providers should provide and has to refer to a
                direct image file such as PNG, JPEG, or GIF image file.

                  This replaces and overrides `picture_claim`.

                  Currently only supported in monolithic (single-process) server configurations where the media repository runs within the Synapse process.

                * `picture_claim`: name of the claim containing an url for the
                user's profile picture. Defaults to "picture", which OpenID
                Connect compliant providers should provide and has to refer to a
                direct image file such as PNG, JPEG, or GIF image file.

                  Currently only supported in monolithic (single-process) server configurations where the media repository runs within the Synapse process.

                  *Deprecated in Synapse v1.75.0.*

                * `localpart_template`: Jinja2 template for the localpart of the
                MXID. If this is not set, the user will be prompted to choose
                their own username (see the documentation for the
                `sso_auth_account_details.html` template). This template can use
                the `localpart_from_email` filter.


                * `confirm_localpart`: Whether to prompt the user to validate
                (or change) the generated localpart (see the documentation for
                the "sso_auth_account_details.html" template), instead of
                registering the account right away.


                * `display_name_template`: Jinja2 template for the display name
                to set on first login. If unset, no displayname will be set.


                * `email_template`: Jinja2 template for the email address of the
                user. If unset, no email address will be added to the account.


                * `extra_attributes`: a map of Jinja2 templates for extra
                attributes to send back to the client during login. Note that
                these are non-standard and clients will ignore them without
                modifications.
        backchannel_logout_enabled:
          type: boolean
          description: >-
            Set to `true` to process OIDC Back-Channel Logout notifications.
            Those notifications are expected to be received on
            `/_synapse/client/oidc/backchannel_logout`. Defaults to `false`.
        backchannel_logout_ignore_sub:
          type: boolean
          description: >-
            By default, the OIDC Back-Channel Logout feature checks that the
            `sub` claim matches the subject claim received during login. This
            check can be disabled by setting this to `true`. Defaults to
            `false`.


            You might want to disable this if the `subject_claim` returned by
            the mapping provider is not `sub`.
    default: []
    examples:
      - - idp_id: my_idp
          idp_name: My OpenID provider
          idp_icon: "mxc://example.com/mediaid"
          discover: false
          issuer: "https://accounts.example.com/"
          client_id: provided-by-your-issuer
          client_secret: provided-by-your-issuer
          client_auth_method: client_secret_post
          scopes:
            - openid
            - profile
          authorization_endpoint: "https://accounts.example.com/oauth2/auth"
          token_endpoint: "https://accounts.example.com/oauth2/token"
          userinfo_endpoint: "https://accounts.example.com/userinfo"
          jwks_uri: "https://accounts.example.com/.well-known/jwks.json"
          additional_authorization_parameters:
            acr_values: 2fa
          passthrough_authorization_parameters:
            - login_hint
          skip_verification: true
          enable_registration: true
          user_mapping_provider:
            config:
              subject_claim: id
              localpart_template: "{{ user.login }}"
              display_name_template: "{{ user.name }}"
              email_template: "{{ user.email }}"
          attribute_requirements:
            - attribute: userGroup
              value: synapseUsers
  cas_config:
    type: object
    description: Enable Central Authentication Service (CAS) for registration and login.
    properties:
      enabled:
        type: boolean
        description: Set this to true to enable authorization against a CAS server.
        default: false
      idp_name:
        type: string
        description: >-
          A user-facing name for this identity provider, which is used to offer
          the user a choice of login mechanisms.
      idp_icon:
        type: ["string", "null"]
        description: >-
          An optional icon for this identity provider, which is presented by
          clients and Synapse's own IdP picker page. If given, must be an MXC
          URI of the format `mxc://<server-name>/<media-id>`. (An easy way to
          obtain such an MXC URI is to upload an image to an (unencrypted) room
          and then copy the URL from the source of the event.)
        default: null
      idp_brand:
        type: ["string", "null"]
        description: >-
          An optional brand for this identity provider, allowing clients to
          style the login flow according to the identity provider in question.
          See the [spec](https://spec.matrix.org/latest/) for possible options
          here.
        default: null
      server_url:
        type: string
        description: The URL of the CAS authorization endpoint.
      protocol_version:
        type: ["integer", "null"]
        description: >-
          The CAS protocol version. (Version 3 is required if you want to use
          `required_attributes`).
        default: null
      displayname_attribute:
        type: ["string", "null"]
        description: >-
          The attribute of the CAS response to use as the display name. If no
          name is given here, no displayname will be set.
        default: null
      required_attributes:
        type: object
        description: >-
          It is possible to configure Synapse to only allow logins if CAS
          attributes match particular values. All of the keys given below must
          exist and the values must match the given value. Alternately if the
          given value is `None` then any value is allowed (the attribute just
          must exist). All of the listed attributes must match for the login to
          be permitted.
        additionalProperties:
          type: ["string", "null"]
        default: {}
      enable_registration:
        type: boolean
        description: >-
          Set to `false` to disable automatic registration of new users. This
          allows the CAS SSO flow to be limited to sign in only, rather than
          automatically registering users that have a valid SSO login but do not
          have a pre-registered account.
        default: true
      allow_numeric_ids:
        type: boolean
        description: >-
          Set to `true` allow numeric user IDs. This allows CAS SSO flow to
          provide user IDs composed of numbers only. These identifiers will be
          prefixed by the letter "u" by default. The prefix can be configured
          using the `numeric_ids_prefix` option. Be careful to choose the prefix
          correctly to avoid any possible conflicts (e.g. user 1234 becomes
          u1234 when a user u1234 already exists).
        default: false
      numeric_ids_prefix:
        type: string
        description: >-
          The prefix you wish to add in front of a numeric user ID when the
          `allow_numeric_ids` option is set to `true`. Only alphanumeric
          characters are allowed.


          *Added in Synapse 1.93.0.*
        default: u
    examples:
      - enabled: true
        server_url: "https://cas-server.com"
        protocol_version: 3
        displayname_attribute: name
        required_attributes:
          userGroup: staff
          department: None
        enable_registration: true
        allow_numeric_ids: true
        numeric_ids_prefix: numericuser
  sso:
    type: object
    description: >-
      Additional settings to use with single-sign on systems such as OpenID
      Connect, SAML2 and CAS.


      Server admins can configure custom templates for pages related to SSO. See
      [here](../../templates.md) for more information.
    properties:
      client_whitelist:
        type: ["array", "null"]
        description: >-
          A list of client URLs which are whitelisted so that the user does not
          have to confirm giving access to their account to the URL. Any client
          whose URL starts with an entry in the following list will not be
          subject to an additional confirmation step after the SSO login is
          completed.


          WARNING: An entry such as "https://my.client" is insecure, because it
          will also match "https://my.client.evil.site", exposing your users to
          phishing attacks from evil.site. To avoid this, include a slash after
          the hostname: "https://my.client/".


          The login fallback page (used by clients that don't natively support
          the required login flows) is whitelisted in addition to any URLs in
          this list. By default, this list contains only the login fallback
          page.
        items:
          type: string
        default: null
      update_profile_information:
        type: boolean
        description: >-
          Use this setting to keep a user's profile fields in sync with
          information from the identity provider. Currently only syncing the
          displayname is supported. Fields are checked on every SSO login, and
          are updated if necessary. Note that enabling this option will override
          user profile information, regardless of whether users have opted-out
          of syncing that information when first signing in.
        default: false
    examples:
      - client_whitelist:
          - "https://riot.im/develop"
          - "https://my.custom.client/"
        update_profile_information: true
  jwt_config:
    type: object
    description: >-
      JSON web token integration. The following settings can be used to make
      Synapse JSON web tokens for authentication, instead of its internal
      password database.


      Each JSON Web Token needs to contain a "sub" (subject) claim, which is
      used as the localpart of the mxid.


      Additionally, the expiration time ("exp"), not before time ("nbf"), and
      issued at ("iat") claims are validated if present.


      Note that this is a non-standard login type and client support is expected
      to be non-existent.


      See [here](../../jwt.md) for more.
    properties:
      enabled:
        type: boolean
        description: Set to true to enable authorization using JSON web tokens.
        default: false
      secret:
        type: string
        description: >-
          This is either the private shared secret or the public key used to
          decode the contents of the JSON web token. Required if `enabled` is
          set to true.
      algorithm:
        type: string
        description: >-
          The algorithm used to sign (or HMAC) the JSON web token. Supported
          algorithms are listed [here (section
          JWS)](https://docs.authlib.org/en/latest/specs/rfc7518.html). Required
          if `enabled` is set to true.
      subject_claim:
        type: ["string", "null"]
        description: Name of the claim containing a unique identifier for the user.
        default: sub
      display_name_claim:
        type: ["string", "null"]
        description: >-
          Name of the claim containing the display name for the user. If
          provided, the display name will be set to the value of this claim upon
          first login.
        default: null
      issuer:
        type: ["string", "null"]
        description: >-
          The issuer to validate the "iss" claim against. If provided the "iss"
          claim will be required and validated for all JSON web tokens.
        default: null
      audiences:
        type: ["array", "null"]
        description: >-
          A list of audiences to validate the "aud" claim against. If provided
          the "aud" claim will be required and validated for all JSON web
          tokens. Note that if the "aud" claim is included in a JSON web token
          then validation will fail without configuring audiences.
        items:
          type: string
        default: null
    examples:
      - enabled: true
        secret: provided-by-your-issuer
        algorithm: provided-by-your-issuer
        subject_claim: name_of_claim
        display_name_claim: name_of_claim
        issuer: provided-by-your-issuer
        audiences:
          - provided-by-your-issuer
  password_config:
    type: object
    description: Use this setting to enable password-based logins.
    properties:
      enabled:
        type: ["boolean", "string"]
        enum:
          - true
          - false
          - only_for_reauth
        description: >-
          Set to false to disable password authentication. Set to
          `only_for_reauth` to allow users with existing passwords to use them
          to reauthenticate (not log in), whilst preventing new users from
          setting passwords.
        default: true
      localdb_enabled:
        type: boolean
        description: >-
          Set to false to disable authentication against the local password
          database. This is ignored if `enabled` is false, and is only useful if
          you have other `password_providers`.
        default: true
      pepper:
        type: ["string", "null"]
        description: >-
          A secret random string that will be appended to user's passwords
          before they are hashed. This improves the security of short passwords.
          DO NOT CHANGE THIS AFTER INITIAL SETUP!
        default: null
      policy:
        type: object
        description: >-
          Define and enforce a password policy, such as minimum lengths for
          passwords, etc. This is an implementation of MSC2000.
        properties:
          enabled:
            type: boolean
            description: Set to true to enable.
            default: false
          minimum_length:
            type: integer
            description: Minimum accepted length for a password.
            default: 0
          require_digit:
            type: boolean
            description: Whether a password must contain at least one digit.
            default: false
          require_symbol:
            type: boolean
            description: >-
              Whether a password must contain at least one symbol. A symbol is
              any character that's not a number or a letter.
            default: false
          require_lowercase:
            type: boolean
            description: Whether a password must contain at least one lowercase letter.
            default: false
          require_uppercase:
            type: boolean
            description: Whether a password must contain at least one uppercase letter.
            default: false
    examples:
      - enabled: false
        localdb_enabled: false
        pepper: EVEN_MORE_SECRET
        policy:
          enabled: true
          minimum_length: 15
          require_digit: true
          require_symbol: true
          require_lowercase: true
          require_uppercase: true
  push:
    type: object
    description: This setting defines options for push notifications.
    properties:
      enabled:
        type: boolean
        description: >-
          Enables or disables push notification calculation. Note, disabling
          this will also stop unread counts being calculated for rooms. This
          mode of operation is intended for homeservers which may only have bots
          or appservice users connected, or are otherwise not interested in
          push/unread counters.
        default: true
      include_content:
        type: boolean
        description: >-
          Clients requesting push notifications can either have the body of the
          message sent in the notification poke along with other details like
          the sender, or just the event ID and room ID (`event_id_only`). If
          clients choose to have the body sent, this option controls whether the
          notification request includes the content of the event (other details
          like the sender are still included). If `event_id_only` is enabled, it
          has no effect. For modern Android devices the notification content
          will still appear because it is loaded by the app. iPhone, however
          will send a notification saying only that a message arrived and who it
          came from. Set to false to only include the event ID and room ID in
          push notification payloads.
        default: true
      group_unread_count_by_room:
        type: boolean
        description: >-
          When a push notification is received, an unread count is also sent.
          This number can either be calculated as the number of unread messages
          for the user, or the number of *rooms* the user has unread messages
          in. If true, push clients will see the number of rooms with unread
          messages in them. Set to false to instead send the number of unread
          messages.
        default: true
      jitter_delay:
        $ref: "#/$defs/duration"
        description: >-
          Delays push notifications by a random amount up to the given duration.
          Useful for mitigating timing attacks. Optional.


          _Added in Synapse 1.84.0._
        default: 0s
    examples:
      - enabled: true
        include_content: false
        group_unread_count_by_room: false
        jitter_delay: 10s
  encryption_enabled_by_default_for_room_type:
    type: string
    description: >-
      Controls whether locally-created rooms should be end-to-end encrypted by
      default.


      Possible options are "all", "invite", and "off". They are defined as:


      * "all": any locally-created room

      * "invite": any room created with the `private_chat` or
      `trusted_private_chat` room creation presets

      * "off": this option will take no effect


      Note that this option will only affect rooms created after it is set. It
      will also not affect rooms created by other servers.
    enum:
      - all
      - invite
      - "off"
    default: "off"
    examples:
      - invite
  user_directory:
    type: object
    description: This setting defines options related to the user directory.
    properties:
      enabled:
        type: boolean
        description: >-
          Defines whether users can search the user directory. If `false` then
          empty responses are returned to all queries.


          *Warning: While the homeserver may determine which subset of users are
          searched, the Matrix specification requires homeservers to include (at
          minimum) users visible in public rooms and users sharing a room with
          the requester. Using `false` improves performance but violates this
          requirement.*
        default: true
      search_all_users:
        type: boolean
        description: >-
          Defines whether to search all users visible to your homeserver at the
          time the search is performed. If set to true, will return all users
          known to the homeserver matching the search query. If false, search
          results will only contain users visible in public rooms and users
          sharing a room with the requester.


          NB. If you set this to true, and the last time the user_directory
          search indexes were (re)built was before Synapse 1.44, you'll have to
          rebuild the indexes in order to search through all known users.


          These indexes are built the first time Synapse starts; admins can
          manually trigger a rebuild via the API following the instructions [for
          running background
          updates](../administration/admin_api/background_updates.md#run), set
          to true to return search results containing all known users, even if
          that user does not share a room with the requester.
        default: false
      prefer_local_users:
        type: boolean
        description: >-
          Defines whether to prefer local users in search query results. If set
          to true, local users are more likely to appear above remote users when
          searching the user directory.
        default: false
      exclude_remote_users:
        type: boolean
        description: If set to true, the search will only return local users.
        default: false
      show_locked_users:
        type: boolean
        description: Defines whether to show locked users in search query results.
        default: false
    examples:
      - enabled: false
        search_all_users: true
        prefer_local_users: true
        exclude_remote_users: false
        show_locked_users: true
  user_consent:
    type: object
    description: >-
      For detailed instructions on user consent configuration, see
      [here](../../consent_tracking.md).


      Parts of this section are required if enabling the `consent` resource
      under [`listeners`](#listeners), in particular `template_dir` and
      `version`.
    properties:
      template_dir:
        type: string
        description: >-
          Gives the location of the templates for the HTML forms. This directory
          should contain one subdirectory per language (eg, `en`, `fr`), and
          each language directory should contain the policy document (named as
          <version>.html) and a success page (success.html).
      version:
        type: number
        description: >-
          Specifies the "current" version of the policy document. It defines the
          version to be served by the consent resource if there is no `v`
          parameter.
      server_notice_content:
        type: object
        description: >-
          If enabled, will send a user a "Server Notice" asking them to consent
          to the privacy policy. The [`server_notices` section](#server_notices)
          must also be configured for this to work. Notices will *not* be sent
          to guest users unless `send_server_notice_to_guests` is set to true.
        properties:
          msgtype:
            type: string
            description: Message type of the notice event.
          body:
            type: string
            description: Message template for the server notice event body.
      send_server_notice_to_guests:
        type: boolean
        description: Send server notices to guest users, too.
        default: false
      block_events_error:
        type: ["string", "null"]
        description: >-
          If set, will block any attempts to send events until the user consents
          to the privacy policy. The value of the setting is used as the text of
          the error.
        default: null
      require_at_registration:
        type: boolean
        description: >-
          If enabled, will add a step to the registration process, similar to
          how captcha works. Users will be required to accept the policy before
          their account is created.
      policy_name:
        type: string
        description: Human-readable name of the privacy policy.
        default: Privacy Policy
    examples:
      - template_dir: res/templates/privacy
        version: 1.0
        server_notice_content:
          msgtype: m.text
          body: >-
            To continue using this homeserver you must review and agree to the
            terms and conditions at %(consent_uri)s
        send_server_notice_to_guests: true
        block_events_error: >-
          To continue using this homeserver you must review and agree to the
          terms and conditions at %(consent_uri)s
        require_at_registration: false
        policy_name: Privacy Policy
  stats:
    type: object
    description: >-
      Settings for local room and user statistics collection. See
      [here](../../room_and_user_statistics.md) for more.
    properties:
      enabled:
        type: boolean
        description: >-
          Set to false to disable room and user statistics. Note that doing so
          may cause certain features (such as the room directory) not to work
          correctly.
        default: true
    examples:
      - enabled: false
  server_notices:
    type: object
    description: >-
      Use this setting to enable a room which can be used to send notices from
      the server to users. It is a special room which users cannot leave;
      notices in the room come from a special "notices" user id.


      If you use this setting, you *must* define the `system_mxid_localpart`
      sub-setting, which defines the id of the user which will be used to send
      the notices.


      Note that the name, topic and avatar of existing server notice rooms will
      only be updated when a new notice event is sent.
    properties:
      system_mxid_display_name:
        type: string
        description: Display name of the "notices" user.
        default: Notices
      system_mxid_avatar_url:
        type: ["string", "null"]
        description: Avatar for the "notices" user.
        default: null
      room_name:
        type: string
        description: Room name of the server notices room.
        default: Server Notices
      room_avatar_url:
        type: ["string", "null"]
        description: >-
          Room avatar to use for server notice rooms. If set to the empty string
          `""`, notice rooms will not be given an avatar.


          _Added in Synapse 1.99.0._
        default: null
      room_topic:
        type: ["string", "null"]
        description: >-
          Topic to use for server notice rooms. If set to the empty string `""`,
          notice rooms will not be given a topic. Defaults to the empty string.


          _Added in Synapse 1.99.0._
        default: null
      auto_join:
        type: boolean
        description: >-
          If true, the user will be automatically joined to the room instead of
          being invited.


          _Added in Synapse 1.98.0._
        default: false
    examples:
      - system_mxid_localpart: notices
        system_mxid_display_name: Server Notices
        system_mxid_avatar_url: "mxc://example.com/oumMVlgDnLYFaPVkExemNVVZ"
        room_name: Server Notices
        room_avatar_url: "mxc://example.com/oumMVlgDnLYFaPVkExemNVVZ"
        room_topic: >-
          Room used by your server admin to notice you of important information
        auto_join: true
  enable_room_list_search:
    type: boolean
    description: >-
      Set to false to disable searching the public room list. When disabled
      blocks searching local and remote room lists for local and remote users by
      always returning an empty list for all queries.
    default: true
    examples:
      - false
  alias_creation_rules:
    type: ["array", "null"]
    description: >-
      The `alias_creation_rules` option allows server admins to prevent unwanted
      alias creation on this server.


      This setting is an optional list of 0 or more rules. By default, no list
      is provided, meaning that all alias creations are permitted.


      Otherwise, requests to create aliases are matched against each rule in
      order. The first rule that matches decides if the request is allowed or
      denied. If no rule matches, the request is denied. In particular, this
      means that configuring an empty list of rules will deny every alias
      creation request.


      Each of the glob patterns is optional, defaulting to `*` ("match
      anything"). Note that the patterns match against fully qualified IDs, e.g.
      against `@alice:example.com`, `#room:example.com` and
      `!abcdefghijk:example.com` instead of `alice`, `room` and `abcedgghijk`.


      Each rule is a YAML object containing four fields, each of which is an
      optional string
    items:
      type: object
      properties:
        user_id:
          type: ["string", "null"]
          description: Glob pattern that matches against the creator of the alias.
        alias:
          type: ["string", "null"]
          description: Glob pattern that matches against the alias being created.
        room_id:
          type: ["string", "null"]
          description: >-
            Glob pattern that matches against the room ID the alias is being pointed at.
        action:
          type: string
          enum:
            - allow
            - deny
          description: >-
            Either `allow` or `deny`. What to do with the request if the rule
            matches. Defaults to `allow`.
    default: null
    examples:
      - null
      - - action: allow
      - []
      - - action: deny
      - - user_id: "@bad_user:example.com"
          action: deny
        - action: allow
      - - room_id: "!forbiddenRoom:example.com"
          action: deny
        - action: allow
  room_list_publication_rules:
    type: ["array", "null"]
    description: >-
      The `room_list_publication_rules` option allows server admins to prevent
      unwanted entries from being published in the public room list.


      The format of this option is the same as that for
      [`alias_creation_rules`](#alias_creation_rules): an optional list of 0 or
      more rules. By default, no list is provided, meaning that no one may
      publish to the room list (except server admins).


      Otherwise, requests to publish a room are matched against each rule in
      order. The first rule that matches decides if the request is allowed or
      denied. If no rule matches, the request is denied. In particular, this
      means that configuring an empty list of rules will deny every alias
      creation request.


      Requests to create a public (public as in published to the room directory)
      room which violates the configured rules will result in the room being
      created but not published to the room directory.


      Each of the glob patterns is optional, defaulting to `*` ("match
      anything"). Note that the patterns match against fully qualified IDs, e.g.
      against `@alice:example.com`, `#room:example.com` and
      `!abcdefghijk:example.com` instead of `alice`, `room` and `abcedgghijk`.


      Each rule is a YAML object containing four fields, each of which is an
      optional string.


      _Changed in Synapse 1.126.0: The default was changed to deny publishing to
      the room list by default_
    items:
      type: object
      properties:
        user_id:
          type: ["string", "null"]
          description: Glob pattern that matches against the user publishing the room.
        alias:
          type: ["string", "null"]
          description: >-
            Glob pattern that matches against one of published room's aliases.

            - If the room has no aliases, the alias match fails unless `alias`
            is unspecified or `*`.

            - If the room has exactly one alias, the alias match succeeds if the
            `alias` pattern matches that alias.

            - If the room has two or more aliases, the alias match succeeds if
            the pattern matches at least one of the aliases.
        room_id:
          type: ["string", "null"]
          description: >-
            Glob pattern that matches against the room ID of the room being published.
        action:
          type: string
          enum:
            - allow
            - deny
          description: >-
            Either `allow` or `deny`. What to do with the request if the rule
            matches. Defaults to `allow`.
    default: null
    examples:
      - null
      - - action: deny
      - []
      - - action: allow
      - - user_id: "@bad_user:example.com"
          action: deny
        - action: allow
      - - room_id: "!forbiddenRoom:example.com"
          action: deny
        - action: allow
      - - alias: "#*potato*:example.com"
          action: deny
        - action: allow
  default_power_level_content_override:
    type: object
    description: >-
      The `default_power_level_content_override` option controls the default
      power levels for rooms.


      Useful if you know that your users need special permissions in rooms that
      they create (e.g. to send particular types of state events without needing
      an elevated power level).  This takes the same shape as the
      `power_level_content_override` parameter in the /createRoom API, but is
      applied before that parameter.


      Note that each key provided inside a preset (for example `events` in the
      example below) will overwrite all existing defaults inside that key. So in
      Example #1, newly-created private_chat rooms will have no rules for any
      event types except `com.example.foo`.


      The default power levels for each preset are:


      ```yaml

      "m.room.name": 50

      "m.room.power_levels": 100

      "m.room.history_visibility": 100

      "m.room.canonical_alias": 50

      "m.room.avatar": 50

      "m.room.tombstone": 100 (150 if MSC4289 is used)

      "m.room.server_acl": 100

      "m.room.encryption": 100

      ```


      In Example #2 the default power-levels for a preset are maintained, but
      the power level for a new key is set.
    default: {}
    examples:
      - private_chat:
          events:
            com.example.foo: 0
        trusted_private_chat: null
        public_chat: null
      - private_chat:
          events:
            com.example.foo: 0
            m.room.name: 50
            m.room.power_levels: 100
            m.room.history_visibility: 100
            m.room.canonical_alias: 50
            m.room.avatar: 50
            m.room.tombstone: 100
            m.room.server_acl: 100
            m.room.encryption: 100
        trusted_private_chat: null
        public_chat: null
  forget_rooms_on_leave:
    type: boolean
    description: >-
      Set to true to automatically forget rooms for users when they leave them,
      either normally or via a kick or ban.
    default: false
    examples:
      - true
  exclude_rooms_from_sync:
    type: array
    description: >-
      A list of rooms to exclude from sync responses. This is useful for server
      administrators wishing to group users into a room without these users
      being able to see it from their client.
    items:
      type: string
    default: []
    examples:
      - - "!foo:example.com"
  opentracing:
    type: object
    description: >-
      These settings enable and configure opentracing, which implements
      distributed tracing. This allows you to observe the causal chains of
      events across servers including requests, key lookups etc., across any
      server running synapse or any other services which support opentracing
      (specifically those implemented with Jaeger).
    properties:
      enabled:
        type: boolean
        description: Whether tracing is enabled. Set to true to enable.
        default: false
      homeserver_whitelist:
        type: array
        description: >-
          The list of homeservers we wish to send and receive span contexts and
          span baggage. See [here](../../opentracing.md) for more. This is a
          list of regexes which are matched against the `server_name` of the
          homeserver. If the list is empty, no servers are matched.
        items:
          type: string
        default: []
      force_tracing_for_users:
        type: array
        description: >-
          A list of the matrix IDs of users whose requests will always be
          traced, even if the tracing system would otherwise drop the traces due
          to probabilistic sampling.
        items:
          type: string
        default: []
      jaeger_config:
        type: object
        description: >-
          Jaeger can be configured to sample traces at different rates. All
          configuration options provided by Jaeger can be set here. Jaeger's
          configuration is mostly related to trace sampling which is documented
          [here](https://www.jaegertracing.io/docs/latest/sampling/).
        default: {}
    examples:
      - enabled: true
        homeserver_whitelist:
          - ".*"
        force_tracing_for_users:
          - "@user1:server_name"
          - "@user2:server_name"
        jaeger_config:
          sampler:
            type: const
            param: 1
          logging: false
  worker_replication_secret:
    type: ["string", "null"]
    description: >-
      A shared secret used by the replication APIs on the main process to
      authenticate HTTP requests from workers.


      If unset or null, traffic between the workers and the main process is not
      authenticated.


      Replacing an existing `worker_replication_secret` with a new one will
      break communication with all workers that have not yet updated their
      secret.
    default: null
    examples:
      - secret_secret
  worker_replication_secret_path:
    type: ["string", "null"]
    description: >-
      An alternative to
      [`worker_replication_secret`](#worker_replication_secret): allows the
      secret to be specified in an external file.


      The file should be a plain text file, containing only the secret. Synapse
      reads the secret from the given file once at startup.


      _Added in Synapse 1.126.0._
    default: null
    examples:
      - /path/to/secrets/file
  start_pushers:
    type: boolean
    description: >-
      Unnecessary to set if using [`pusher_instances`](#pusher_instances) with
      [`generic_workers`](../../workers.md#synapseappgeneric_worker).


      Controls sending of push notifications on the main process. Set to `false`
      if using a [pusher worker](../../workers.md#synapseapppusher).
    default: true
    examples:
      - false
  pusher_instances:
    type: array
    description: >-
      It is possible to scale the processes that handle sending push
      notifications to [sygnal](https://github.com/matrix-org/sygnal) and email
      by running a [`generic_worker`](../../workers.md#synapseappgeneric_worker)
      and adding it's [`worker_name`](#worker_name) to a `pusher_instances` map.
      Doing so will remove handling of this function from the main process.
      Multiple workers can be added to this map, in which case the work is
      balanced across them. Ensure the main process and all pusher workers are
      restarted after changing this option.
    items:
      type: string
    default: []
    examples:
      - - pusher_worker1
      - - pusher_worker1
        - pusher_worker2
  send_federation:
    type: boolean
    description: >-
      Unnecessary to set if using
      [`federation_sender_instances`](#federation_sender_instances) with
      [`generic_workers`](../../workers.md#synapseappgeneric_worker).


      Controls sending of outbound federation transactions on the main process.
      Set to `false` if using a [federation sender
      worker](../../workers.md#synapseappfederation_sender).
    default: true
    examples:
      - false
  federation_sender_instances:
    type: array
    description: >-
      It is possible to scale the processes that handle sending outbound
      federation requests by running a
      [`generic_worker`](../../workers.md#synapseappgeneric_worker) and adding
      it's [`worker_name`](#worker_name) to a `federation_sender_instances` map.
      Doing so will remove handling of this function from the main process.
      Multiple workers can be added to this map, in which case the work is
      balanced across them.


      The way that the load balancing works is any outbound federation request
      will be assigned to a federation sender worker based on the hash of the
      destination server name. This means that all requests being sent to the
      same destination will be processed by the same worker instance. Multiple
      `federation_sender_instances` are useful if there is a federation with
      multiple servers.


      This configuration setting must be shared between all workers handling
      federation sending, and if changed all federation sender workers must be
      stopped at the same time and then started, to ensure that all instances
      are running with the same config (otherwise events may be dropped).
    items:
      type: string
    default: []
    examples:
      - - federation_sender1
      - - federation_sender1
        - federation_sender2
  instance_map:
    type: object
    description: >-
      When using workers this should be a map from [`worker_name`](#worker_name)
      to the HTTP replication listener of the worker, if configured, and to the
      main process. Each worker declared under
      [`stream_writers`](../../workers.md#stream-writers) and
      [`outbound_federation_restricted_to`](#outbound_federation_restricted_to)
      needs a HTTP replication listener, and that listener should be included in
      the `instance_map`. The main process also needs an entry on the
      `instance_map`, and it should be listed under `main` **if even one other
      worker exists**. Ensure the port matches with what is declared inside the
      `listener` block for a `replication` listener.
    additionalProperties:
      type: object
    default: {}
    examples:
      - main:
          host: localhost
          port: 8030
        worker1:
          host: localhost
          port: 8034
        other:
          host: localhost
          port: 8035
          tls: true
      - main:
          path: /run/synapse/main_replication.sock
        worker1:
          path: /run/synapse/worker1_replication.sock
  stream_writers:
    type: object
    description: >-
      Experimental: When using workers you can define which workers should
      handle writing to streams such as event persistence and typing
      notifications. Any worker specified here must also be in the
      [`instance_map`](#instance_map).


      See the list of available streams in the [worker
      documentation](../../workers.md#stream-writers).
    properties:
      events:
        type: string
        description: Name of a worker assigned to the `events` stream.
      typing:
        type: string
        description: Name of a worker assigned to the `typing` stream.
      to_device:
        type: string
        description: Name of a worker assigned to the `to_device` stream.
      account_data:
        type: string
        description: Name of a worker assigned to the `account_data` stream.
      receipts:
        type: string
        description: Name of a worker assigned to the `receipts` stream.
      presence:
        type: string
        description: Name of a worker assigned to the `presence` stream.
      push_rules:
        type: string
        description: Name of a worker assigned to the `push_rules` stream.
      device_lists:
        type: string
        description: Name of a worker assigned to the `device_lists` stream.
    default: {}
    examples:
      - events: worker1
        typing: worker1
  outbound_federation_restricted_to:
    type: array
    description: >-
      You can restrict outbound federation traffic to only go through a specific subset
      of workers including the [Secure Border Gateway
      (SBG)](https://element.io/en/server-suite/secure-border-gateways). Any worker
      specified here (including the SBG) must also be in the
      [`instance_map`](#instance_map).
      [`worker_replication_secret`](#worker_replication_secret) must also be configured
      to authorize inter-worker communication.


      Also see the [worker
      documentation](../../workers.md#restrict-outbound-federation-traffic-to-a-specific-set-of-workers)
      for more info.


      _Added in Synapse 1.89.0._
    items:
      type: string
    default: []
    examples:
      - - federation_sender1
        - federation_sender2
  run_background_tasks_on:
    type: ["string", "null"]
    description: >-
      The [worker](../../workers.md#background-tasks) that is used to run
      background tasks (e.g. cleaning up expired data). If not provided this
      defaults to the main process.
    default: null
    examples:
      - worker1
  update_user_directory_from_worker:
    type: ["string", "null"]
    description: >-
      The [worker](../../workers.md#updating-the-user-directory) that is used to
      update the user directory. If not provided this defaults to the main
      process.


      _Added in Synapse 1.59.0._
    default: null
    examples:
      - worker1
  notify_appservices_from_worker:
    type: ["string", "null"]
    description: >-
      The [worker](../../workers.md#notifying-application-services) that is used
      to send output traffic to Application Services. If not provided this
      defaults to the main process.


      _Added in Synapse 1.59.0._
    default: null
    examples:
      - worker1
  media_instance_running_background_jobs:
    type: ["string", "null"]
    description: >-
      The [worker](../../workers.md#synapseappmedia_repository) that is used to
      run background tasks for media repository. If running multiple media
      repositories you must configure a single instance to run the background
      tasks. If not provided this defaults to the main process or your single
      `media_repository` worker.


      _Added in Synapse 1.16.0._
    default: null
    examples:
      - worker1
  redis:
    type: object
    description: >-
      Configuration for Redis when using workers. This *must* be enabled when
      using workers.


      _Added in Synapse 1.78.0._


      _Changed in Synapse 1.84.0: Added use\_tls, certificate\_file,
      private\_key\_file, ca\_file and ca\_path attributes_


      _Changed in Synapse 1.85.0: Added path option to use a local Unix socket_


      _Changed in Synapse 1.116.0: Added password\_path_
    properties:
      enabled:
        type: boolean
        description: Whether to use Redis support.
        default: false
      host:
        type: string
        description: Optional host to use to connect to Redis.
        default: localhost
      port:
        type: integer
        description: Optional port to use to connect to Redis.
        default: 6379
      path:
        type: string
        description: >-
          The full path to a local Unix socket file. **If this is used, `host`
          and `port` are ignored.**
        default: /tmp/redis.sock
      password:
        type: ["string", "null"]
        description: Optional password if configured on the Redis instance.
        default: null
      password_path:
        type: ["string", "null"]
        description: >-
          Alternative to `password`, reading the password from an external file.
          The file should be a plain text file, containing only the password.
          Synapse reads the password from the given file once at startup.
        default: null
      dbid:
        type: ["string", "null"]
        description: >-
          Optional redis dbid if needs to connect to specific redis logical db.
        default: null
      use_tls:
        type: boolean
        description: Whether to use a TLS connection.
        default: false
      certificate_file:
        type: ["string", "null"]
        description: Optional path to the certificate file.
        default: null
      private_key_file:
        type: ["string", "null"]
        description: Optional path to the private key file.
        default: null
      ca_file:
        type: ["string", "null"]
        description: >-
          Optional path to the CA certificate file. Use this one or `ca_path`
        default: null
      ca_path:
        type: ["string", "null"]
        description: >-
          Optional path to the folder containing the CA certificate file. Use
          this one or `ca_file`
        default: null
    examples:
      - enabled: true
        host: localhost
        port: 6379
        password_path: "<path_to_the_password_file>"
        dbid: "<dbid>"
  worker_app:
    type: string
    description: >-
      The type of worker. The currently available worker applications are listed
      in [worker documentation](../../workers.md#available-worker-applications).


      The most common worker is the
      [`synapse.app.generic_worker`](../../workers.md#synapseappgeneric_worker).
    examples:
      - synapse.app.generic_worker
  worker_name:
    type: string
    description: >-
      A unique name for the worker. The worker needs a name to be addressed in
      further parameters and identification in log files. We strongly recommend
      giving each worker a unique `worker_name`.
    examples:
      - generic_worker1
  worker_listeners:
    type: array
    description: >-
      A worker can handle HTTP requests. To do so, a `worker_listeners` option
      must be declared, in the same way as the [`listeners` option](#listeners)
      in the shared config.


      Workers declared in [`stream_writers`](#stream_writers) and
      [`instance_map`](#instance_map) will need to include a `replication`
      listener here, in order to accept internal HTTP requests from other
      workers.


      Example #2 is using UNIX sockets with a `replication` listener.
    default: []
    examples:
      - - type: http
          port: 8083
          resources:
            - names:
                - client
                - federation
      - - type: http
          path: /run/synapse/worker_replication.sock
          resources:
            - names:
                - replication
        - type: http
          path: /run/synapse/worker_public.sock
          resources:
            - names:
                - client
                - federation
  worker_manhole:
    type: ["integer", "null"]
    description: >-
      A worker may have a listener for [`manhole`](../../manhole.md). It allows
      server administrators to access a Python shell on the worker.


      The example below is a short form for

      ```yaml

      worker_listeners:
        - port: 9000
          bind_addresses: ['127.0.0.1']
          type: manhole
      ```


      It needs also an additional [`manhole_settings`](#manhole_settings)
      configuration.
    default: null
    examples:
      - 9000
  worker_daemonize:
    type: boolean
    description: >-
      Specifies whether the worker should be started as a daemon process. If
      Synapse is being managed by [systemd](../../systemd-with-workers/), this
      option must be omitted or set to `false`.
    default: false
    examples:
      - true
  worker_pid_file:
    type: ["string", "null"]
    description: >-
      When running a worker as a daemon, we need a place to store the
      [PID](https://en.wikipedia.org/wiki/Process_identifier) of the worker.
      This option defines the location of that "pid file".


      This option is required if `worker_daemonize` is `true` and ignored
      otherwise.


      See also the [`pid_file` option](#pid_file) option for the main Synapse
      process.
    default: null
    examples:
      - DATADIR/generic_worker1.pid
  worker_log_config:
    type: ["string", "null"]
    description: >-
      This option specifies a yaml python logging config file as described
      [here](https://docs.python.org/3/library/logging.config.html#configuration-dictionary-schema).
      See also the [`log_config` option](#log_config) option for the main
      Synapse process.
    default: null
    examples:
      - /etc/matrix-synapse/generic-worker-log.yaml
  background_updates:
    type: object
    description: >-
      Background updates are database updates that are run in the background in
      batches. The duration, minimum batch size, default batch size, whether to
      sleep between batches and if so, how long to sleep can all be configured.
      This is helpful to speed up or slow down the updates.
    properties:
      background_update_duration_ms:
        type: integer
        description: How long in milliseconds to run a batch of background updates for.
        default: 100
      sleep_enabled:
        type: boolean
        description: Whether to sleep between updates.
        default: true
      sleep_duration_ms:
        type: integer
        description: If sleeping between updates, how long in milliseconds to sleep for.
        default: 1000
      min_batch_size:
        type: integer
        description: >-
          Minimum size a batch of background updates can be. Must be greater than 0.
        default: 1
      default_batch_size:
        type: integer
        description: >-
          The batch size to use for the first iteration of a new background update.
        default: 100
    examples:
      - background_update_duration_ms: 500
        sleep_enabled: false
        sleep_duration_ms: 300
        min_batch_size: 10
        default_batch_size: 50
  auto_accept_invites:
    type: object
    description: >-
      Automatically accepting invites controls whether users are presented with
      an invite request or if they are instead automatically joined to a room
      when receiving an invite. Set the `enabled` sub-option to true to enable
      auto-accepting invites.


      NOTE: Care should be taken not to enable this setting if the
      `synapse_auto_accept_invite` module is enabled and installed. The two
      modules will compete to perform the same task and may result in undesired
      behaviour. For example, multiple join events could be generated from a
      single invite.
    properties:
      enabled:
        type: boolean
        description: Whether to run the auto-accept invites logic.
        default: false
      only_for_direct_messages:
        type: boolean
        description: >-
          Whether invites should be automatically accepted for all room types,
          or only for direct messages.
        default: false
      only_from_local_users:
        type: boolean
        description: >-
          Whether to only automatically accept invites from users on this homeserver.
        default: false
      worker_to_run_on:
        type: ["string", "null"]
        description: >-
          Which worker to run this module on. This must match the "worker_name".
          If not set or `null`, invites will be accepted on the main process.
        default: null
    examples:
      - enabled: true
        only_for_direct_messages: true
        only_from_local_users: true
        worker_to_run_on: worker_1
$defs:
  bytes:
    type: ["string", "integer"]
    io.element.type_name: byte size
  duration:
    type: ["string", "integer"]
    io.element.type_name: duration
  size:
    type: ["string", "integer"]
    io.element.type_name: size
  3pidmedium:
    type: string
    enum:
      - email
      - msisdn
  rc:
    type: object
    properties:
      per_second:
        type: number
        description: Maximum number of requests a client can send per second.
      burst_count:
        type: number
        description: >-
          Maximum number of requests a client can send before being throttled.
  database:
    type: object
    description: >-
      The `database` setting defines the database that synapse uses to store all
      of its data.


      For more information on using Synapse with Postgres, see
      [here](../../postgres.md).
    properties:
      name:
        type: string
        enum:
          - sqlite3
          - psycopg2
        description: >-
          This option specifies the database engine to use: either `sqlite3`
          (for SQLite) or `psycopg2` (for PostgreSQL). If no name is specified
          Synapse will default to SQLite.
        default: sqlite3
      txn_limit:
        type: integer
        description: >-
          Gives the maximum number of transactions to run per connection before
          reconnecting. 0 means no limit.
        default: 0
      allow_unsafe_locale:
        type: boolean
        description: >-
          This option is specific to Postgres. Under the default behavior,
          Synapse will refuse to start if the postgres db is set to a non-C
          locale. You can override this behavior (which is *not* recommended) by
          setting `allow_unsafe_locale` to true. Note that doing so may corrupt
          your database. You can find more information
          [here](../../postgres.md#fixing-incorrect-collate-or-ctype) and
          [here](https://wiki.postgresql.org/wiki/Locale_data_changes).
        default: false
      args:
        type: object
        description: >-
          Gives options which are passed through to the database engine, except
          for options starting with `cp_`, which are used to configure the
          Twisted connection pool. For a reference to valid arguments, see:

          * for
          [sqlite](https://docs.python.org/3/library/sqlite3.html#sqlite3.connect)

          * for
          [postgres](https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-PARAMKEYWORDS)

          * for [the connection
          pool](https://docs.twistedmatrix.com/en/stable/api/twisted.enterprise.adbapi.ConnectionPool.html#__init__)
