#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2018-2021 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
from __future__ import annotations

import urllib.parse
from typing import Any, cast
from unittest.mock import Mock

from parameterized import parameterized

from twisted.internet.defer import Deferred
from twisted.internet.testing import MemoryReactor
from twisted.web.resource import Resource

import synapse.rest.admin
from synapse.http.server import JsonResource
from synapse.rest.admin import VersionServlet
from synapse.rest.client import login, media, room
from synapse.server import HomeServer
from synapse.types import UserID
from synapse.util.clock import Clock

from tests import unittest
from tests.test_utils import SMALL_PNG


class VersionTestCase(unittest.HomeserverTestCase):
    url = "/_synapse/admin/v1/server_version"

    def create_test_resource(self) -> JsonResource:
        resource = JsonResource(self.hs)
        VersionServlet(self.hs).register(resource)
        return resource

    def test_version_string(self) -> None:
        channel = self.make_request("GET", self.url, shorthand=False)

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual({"server_version"}, set(channel.json_body.keys()))


class QuarantineMediaTestCase(unittest.HomeserverTestCase):
    """Test /quarantine_media admin API."""

    servlets = [
        synapse.rest.admin.register_servlets,
        synapse.rest.admin.register_servlets_for_media_repo,
        login.register_servlets,
        media.register_servlets,
        room.register_servlets,
    ]

    def create_resource_dict(self) -> dict[str, Resource]:
        resources = super().create_resource_dict()
        resources["/_matrix/media"] = self.hs.get_media_repository_resource()
        return resources

    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
        self.fetches: list[tuple[tuple[Any, ...], dict[str, Any]]] = []

        # A remote fetch of media that was not intentional.
        # Used to check that remote media fetches do NOT happen.
        def unexpected_remote_fetch(*args: Any, **kwargs: Any) -> Deferred[Any]:
            self.fetches.append((args, kwargs))
            return Deferred()

        client = Mock()
        client.federation_get_file = unexpected_remote_fetch
        client.get_file = unexpected_remote_fetch

        return self.setup_test_homeserver(
            clock=clock,
            federation_http_client=client,
        )

    def _ensure_quarantined(
        self,
        user_tok: str,
        server_and_media_id: str,
        include_bypass_param: bool = False,
    ) -> None:
        """Ensure a piece of media is quarantined when trying to access it.

        The include_bypass_param flag enables the presence of the
        admin_unsafely_bypass_quarantine query parameter, but still expects that the
        request will fail to download the media.
        """
        if include_bypass_param:
            query_string = "?admin_unsafely_bypass_quarantine=true"
            channel = self.make_request(
                "GET",
                f"/_matrix/client/v1/media/download/{server_and_media_id}{query_string}",
                shorthand=False,
                access_token=user_tok,
            )

            # Non-admins can't bypass, so this should fail regardless of whether the
            # media is actually quarantined.
            self.assertEqual(
                400,
                channel.code,
                msg=(
                    "Expected to receive a 400 when bypassing quarantined media: %s"
                    % server_and_media_id
                ),
            )

        # Repeat the request, this time without the bypass parameter.
        channel = self.make_request(
            "GET",
            f"/_matrix/client/v1/media/download/{server_and_media_id}",
            shorthand=False,
            access_token=user_tok,
        )

        # Should be quarantined
        self.assertEqual(
            404,
            channel.code,
            msg=(
                "Expected to receive a 404 on accessing quarantined media: %s"
                % server_and_media_id
            ),
        )

    def test_admin_can_bypass_quarantine(self) -> None:
        self.register_user("admin", "pass", admin=True)
        admin_user_tok = self.login("admin", "pass")

        # Upload some media
        response = self.helper.upload_media(SMALL_PNG, tok=admin_user_tok)

        # Extract media ID from the response
        server_name_and_media_id = response["content_uri"][6:]  # Cut off 'mxc://'
        server_name, media_id = server_name_and_media_id.split("/")

        # Attempt to access the media
        channel = self.make_request(
            "GET",
            f"/_matrix/client/v1/media/download/{server_name_and_media_id}",
            shorthand=False,
            access_token=admin_user_tok,
        )

        # Should be successful
        self.assertEqual(200, channel.code)

        # Quarantine the media
        url = "/_synapse/admin/v1/media/quarantine/%s/%s" % (
            urllib.parse.quote(server_name),
            urllib.parse.quote(media_id),
        )
        channel = self.make_request(
            "POST",
            url,
            access_token=admin_user_tok,
        )
        self.pump(1.0)
        self.assertEqual(200, channel.code, msg=channel.json_body)

        # Now access it *without* the bypass parameter - this should fail (as expected).
        self._ensure_quarantined(
            admin_user_tok, server_name_and_media_id, include_bypass_param=False
        )

        # Now access it *with* the bypass parameter - this should work
        channel = self.make_request(
            "GET",
            f"/_matrix/client/v1/media/download/{server_name_and_media_id}?admin_unsafely_bypass_quarantine=true",
            shorthand=False,
            access_token=admin_user_tok,
        )
        self.assertEqual(
            200,
            channel.code,
            msg=(
                "Expected to receive a 200 on accessing (with bypass) quarantined media: %s"
                % server_name_and_media_id
            ),
        )

    def test_non_admin_bypass_does_not_fetch_remote_media(self) -> None:
        self.register_user("nonadmin", "pass", admin=False)
        non_admin_user_tok = self.login("nonadmin", "pass")

        channel = self.make_request(
            "GET",
            "/_matrix/client/v1/media/download/example.com/remote_media"
            "?admin_unsafely_bypass_quarantine=true",
            shorthand=False,
            access_token=non_admin_user_tok,
            await_result=False,
        )
        self.pump()

        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(
            channel.json_body["error"],
            "Must be a server admin to bypass quarantine",
        )
        # Check that a remote fetch attempt did not occur.
        self.assertEqual(self.fetches, [])

    @parameterized.expand(
        [
            # Attempt quarantine media APIs as non-admin
            "/_synapse/admin/v1/media/quarantine/example.org/abcde12345",
            # And the roomID/userID endpoint
            "/_synapse/admin/v1/room/!room%3Aexample.com/media/quarantine",
        ]
    )
    def test_quarantine_media_requires_admin(self, url: str) -> None:
        self.register_user("nonadmin", "pass", admin=False)
        non_admin_user_tok = self.login("nonadmin", "pass")

        channel = self.make_request(
            "POST",
            url.encode("ascii"),
            access_token=non_admin_user_tok,
        )

        # Expect a forbidden error
        self.assertEqual(
            403,
            channel.code,
            msg="Expected forbidden on quarantining media as a non-admin",
        )

    def test_quarantine_media_by_id(self) -> None:
        self.register_user("id_admin", "pass", admin=True)
        admin_user_tok = self.login("id_admin", "pass")

        self.register_user("id_nonadmin", "pass", admin=False)
        non_admin_user_tok = self.login("id_nonadmin", "pass")

        # Upload some media into the room
        response = self.helper.upload_media(SMALL_PNG, tok=admin_user_tok)

        # Extract media ID from the response
        server_name_and_media_id = response["content_uri"][6:]  # Cut off 'mxc://'
        server_name, media_id = server_name_and_media_id.split("/")

        # Attempt to access the media
        channel = self.make_request(
            "GET",
            f"/_matrix/client/v1/media/download/{server_name_and_media_id}",
            shorthand=False,
            access_token=non_admin_user_tok,
        )

        # Should be successful
        self.assertEqual(200, channel.code)

        # Quarantine the media
        url = "/_synapse/admin/v1/media/quarantine/%s/%s" % (
            urllib.parse.quote(server_name),
            urllib.parse.quote(media_id),
        )
        channel = self.make_request(
            "POST",
            url,
            access_token=admin_user_tok,
        )
        self.pump(1.0)
        self.assertEqual(200, channel.code, msg=channel.json_body)

        # Attempt to access the media (and ensure non-admins can't download it, even
        # with a bypass parameter). Admins cannot download it without the bypass param.
        self._ensure_quarantined(
            non_admin_user_tok, server_name_and_media_id, include_bypass_param=True
        )
        self._ensure_quarantined(
            admin_user_tok, server_name_and_media_id, include_bypass_param=False
        )

    @parameterized.expand(
        [
            # regular API path
            "/_synapse/admin/v1/room/%s/media/quarantine",
            # deprecated API path
            "/_synapse/admin/v1/quarantine_media/%s",
        ]
    )
    def test_quarantine_all_media_in_room(self, url: str) -> None:
        self.register_user("room_admin", "pass", admin=True)
        admin_user_tok = self.login("room_admin", "pass")

        non_admin_user = self.register_user("room_nonadmin", "pass", admin=False)
        non_admin_user_tok = self.login("room_nonadmin", "pass")

        room_id = self.helper.create_room_as(non_admin_user, tok=admin_user_tok)
        self.helper.join(room_id, non_admin_user, tok=non_admin_user_tok)

        # Upload some media
        response_1 = self.helper.upload_media(SMALL_PNG, tok=non_admin_user_tok)
        response_2 = self.helper.upload_media(SMALL_PNG, tok=non_admin_user_tok)

        # Extract mxcs
        mxc_1 = response_1["content_uri"]
        mxc_2 = response_2["content_uri"]

        # Send it into the room
        self.helper.send_event(
            room_id,
            "m.room.message",
            content={"body": "image-1", "msgtype": "m.image", "url": mxc_1},
            txn_id="111",
            tok=non_admin_user_tok,
        )
        self.helper.send_event(
            room_id,
            "m.room.message",
            content={"body": "image-2", "msgtype": "m.image", "url": mxc_2},
            txn_id="222",
            tok=non_admin_user_tok,
        )

        channel = self.make_request(
            "POST",
            url % urllib.parse.quote(room_id),
            access_token=admin_user_tok,
        )
        self.pump(1.0)
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(
            channel.json_body, {"num_quarantined": 2}, "Expected 2 quarantined items"
        )

        # Convert mxc URLs to server/media_id strings
        server_and_media_id_1 = mxc_1[6:]
        server_and_media_id_2 = mxc_2[6:]

        # Test that we cannot download any of the media anymore, especially with the
        # bypass parameter set. Admins cannot download the media without supplying the
        # bypass parameter, so we check that too.
        self._ensure_quarantined(
            non_admin_user_tok, server_and_media_id_1, include_bypass_param=True
        )
        self._ensure_quarantined(
            non_admin_user_tok, server_and_media_id_2, include_bypass_param=True
        )
        self._ensure_quarantined(
            admin_user_tok, server_and_media_id_1, include_bypass_param=False
        )
        self._ensure_quarantined(
            admin_user_tok, server_and_media_id_2, include_bypass_param=False
        )

    def test_quarantine_all_media_by_user(self) -> None:
        self.register_user("user_admin", "pass", admin=True)
        admin_user_tok = self.login("user_admin", "pass")

        non_admin_user = self.register_user("user_nonadmin", "pass", admin=False)
        non_admin_user_tok = self.login("user_nonadmin", "pass")

        # Upload some media
        response_1 = self.helper.upload_media(SMALL_PNG, tok=non_admin_user_tok)
        response_2 = self.helper.upload_media(SMALL_PNG, tok=non_admin_user_tok)
        response_3 = self.helper.upload_media(SMALL_PNG, tok=non_admin_user_tok)

        # Extract media IDs
        server_and_media_id_1 = response_1["content_uri"][6:]
        server_and_media_id_2 = response_2["content_uri"][6:]
        server_and_media_id_3 = response_3["content_uri"][6:]

        # Remove the hash from the media to simulate historic media.
        self.get_success(
            self.hs.get_datastores().main.update_local_media(
                media_id=server_and_media_id_3.split("/")[1],
                media_type="image/png",
                upload_name=None,
                media_length=123,
                user_id=UserID.from_string(non_admin_user),
                # Hack to force some media to have no hash.
                sha256=cast(str, None),
            )
        )

        # Quarantine all media by this user
        url = "/_synapse/admin/v1/user/%s/media/quarantine" % urllib.parse.quote(
            non_admin_user
        )
        channel = self.make_request(
            "POST",
            url.encode("ascii"),
            access_token=admin_user_tok,
        )
        self.pump(1.0)
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(
            channel.json_body, {"num_quarantined": 3}, "Expected 3 quarantined items"
        )

        # Attempt to access each piece of media, ensuring that it can't be downloaded
        # even with a bypass parameter. Admins should not be able to download the media
        # either when not supplying the bypass parameter, so we check that too.
        self._ensure_quarantined(
            non_admin_user_tok, server_and_media_id_1, include_bypass_param=True
        )
        self._ensure_quarantined(
            non_admin_user_tok, server_and_media_id_2, include_bypass_param=True
        )
        self._ensure_quarantined(
            non_admin_user_tok, server_and_media_id_3, include_bypass_param=True
        )
        self._ensure_quarantined(
            admin_user_tok, server_and_media_id_1, include_bypass_param=False
        )
        self._ensure_quarantined(
            admin_user_tok, server_and_media_id_2, include_bypass_param=False
        )
        self._ensure_quarantined(
            admin_user_tok, server_and_media_id_3, include_bypass_param=False
        )

    def test_cannot_quarantine_safe_media(self) -> None:
        self.register_user("user_admin", "pass", admin=True)
        admin_user_tok = self.login("user_admin", "pass")

        non_admin_user = self.register_user("user_nonadmin", "pass", admin=False)
        non_admin_user_tok = self.login("user_nonadmin", "pass")

        # Upload some media
        response_1 = self.helper.upload_media(SMALL_PNG, tok=non_admin_user_tok)
        response_2 = self.helper.upload_media(SMALL_PNG, tok=non_admin_user_tok)

        # Extract media IDs
        server_and_media_id_1 = response_1["content_uri"][6:]
        server_and_media_id_2 = response_2["content_uri"][6:]

        # Mark the second item as safe from quarantine.
        _, media_id_2 = server_and_media_id_2.split("/")
        # Quarantine the media
        url = "/_synapse/admin/v1/media/protect/%s" % (urllib.parse.quote(media_id_2),)
        channel = self.make_request("POST", url, access_token=admin_user_tok)
        self.pump(1.0)
        self.assertEqual(200, channel.code, msg=channel.json_body)

        # Quarantine all media by this user
        url = "/_synapse/admin/v1/user/%s/media/quarantine" % urllib.parse.quote(
            non_admin_user
        )
        channel = self.make_request(
            "POST",
            url.encode("ascii"),
            access_token=admin_user_tok,
        )
        self.pump(1.0)
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(
            channel.json_body, {"num_quarantined": 1}, "Expected 1 quarantined item"
        )

        # Attempt to access each piece of media, the first should fail, the
        # second should succeed. We check both the non-admin user with a bypass
        # parameter, and the admin user without.
        self._ensure_quarantined(
            non_admin_user_tok, server_and_media_id_1, include_bypass_param=True
        )
        self._ensure_quarantined(
            admin_user_tok, server_and_media_id_1, include_bypass_param=False
        )

        # Attempt to access each piece of media
        channel = self.make_request(
            "GET",
            f"/_matrix/client/v1/media/download/{server_and_media_id_2}",
            shorthand=False,
            access_token=non_admin_user_tok,
        )

        # Shouldn't be quarantined
        self.assertEqual(
            200,
            channel.code,
            msg=(
                "Expected to receive a 200 on accessing not-quarantined media: %s"
                % server_and_media_id_2
            ),
        )


class PurgeHistoryTestCase(unittest.HomeserverTestCase):
    servlets = [
        synapse.rest.admin.register_servlets,
        login.register_servlets,
        room.register_servlets,
    ]

    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
        self.admin_user = self.register_user("admin", "pass", admin=True)
        self.admin_user_tok = self.login("admin", "pass")

        self.other_user = self.register_user("user", "pass")
        self.other_user_tok = self.login("user", "pass")

        self.room_id = self.helper.create_room_as(
            self.other_user, tok=self.other_user_tok
        )
        self.url = f"/_synapse/admin/v1/purge_history/{self.room_id}"
        self.url_status = "/_synapse/admin/v1/purge_history_status/"

    def test_purge_history(self) -> None:
        """
        Simple test of purge history API.
        Test only that is is possible to call, get status 200 and purge_id.
        """

        channel = self.make_request(
            "POST",
            self.url,
            content={"delete_local_events": True, "purge_up_to_ts": 0},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertIn("purge_id", channel.json_body)
        purge_id = channel.json_body["purge_id"]

        # get status
        channel = self.make_request(
            "GET",
            self.url_status + purge_id,
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual("complete", channel.json_body["status"])


class ExperimentalFeaturesTestCase(unittest.HomeserverTestCase):
    servlets = [
        synapse.rest.admin.register_servlets,
        login.register_servlets,
    ]

    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
        self.admin_user = self.register_user("admin", "pass", admin=True)
        self.admin_user_tok = self.login("admin", "pass")

        self.other_user = self.register_user("user", "pass")
        self.other_user_tok = self.login("user", "pass")

        self.url = "/_synapse/admin/v1/experimental_features"

    def test_enable_and_disable(self) -> None:
        """
        Test basic functionality of ExperimentalFeatures endpoint
        """
        # test enabling features works
        url = f"{self.url}/{self.other_user}"
        channel = self.make_request(
            "PUT",
            url,
            content={
                "features": {"msc3881": True},
            },
            access_token=self.admin_user_tok,
        )
        self.assertEqual(channel.code, 200)

        # list which features are enabled and ensure the ones we enabled are listed
        self.assertEqual(channel.code, 200)
        url = f"{self.url}/{self.other_user}"
        channel = self.make_request(
            "GET",
            url,
            access_token=self.admin_user_tok,
        )
        self.assertEqual(channel.code, 200)
        self.assertEqual(
            True,
            channel.json_body["features"]["msc3881"],
        )

        # test disabling a feature works
        url = f"{self.url}/{self.other_user}"
        channel = self.make_request(
            "PUT",
            url,
            content={"features": {"msc3881": False}},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(channel.code, 200)

        # list the features enabled/disabled and ensure they are still are correct
        self.assertEqual(channel.code, 200)
        url = f"{self.url}/{self.other_user}"
        channel = self.make_request(
            "GET",
            url,
            access_token=self.admin_user_tok,
        )
        self.assertEqual(channel.code, 200)
        self.assertEqual(
            False,
            channel.json_body["features"]["msc3881"],
        )

        # test nothing blows up if you try to disable a feature that isn't already enabled
        url = f"{self.url}/{self.other_user}"
        channel = self.make_request(
            "PUT",
            url,
            content={"features": {"msc3881": False}},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(channel.code, 200)

        # test trying to enable a feature without an admin access token is denied
        url = f"{self.url}/f{self.other_user}"
        channel = self.make_request(
            "PUT",
            url,
            content={"features": {"msc3881": True}},
            access_token=self.other_user_tok,
        )
        self.assertEqual(channel.code, 403)
        self.assertEqual(
            channel.json_body,
            {"errcode": "M_FORBIDDEN", "error": "You are not a server admin"},
        )

        # test trying to enable a bogus msc is denied
        url = f"{self.url}/{self.other_user}"
        channel = self.make_request(
            "PUT",
            url,
            content={"features": {"msc6666": True}},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(channel.code, 400)
        self.assertEqual(
            channel.json_body,
            {
                "errcode": "M_UNKNOWN",
                "error": "'msc6666' is not recognised as a valid experimental feature.",
            },
        )
