# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import json
import os
import urllib.parse
from binascii import unhexlify
from unittest.mock import Mock

from twisted.internet.defer import Deferred

import synapse.rest.admin
from synapse.http.server import JsonResource
from synapse.logging.context import make_deferred_yieldable
from synapse.rest.admin import VersionServlet
from synapse.rest.client import groups, login, room

from tests import unittest
from tests.server import FakeSite, make_request


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

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

    def test_version_string(self):
        channel = self.make_request("GET", self.url, shorthand=False)

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(
            {"server_version", "python_version"}, set(channel.json_body.keys())
        )


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

    def prepare(self, reactor, clock, hs):
        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_token = self.login("user", "pass")

    def test_delete_group(self):
        # Create a new group
        channel = self.make_request(
            "POST",
            b"/create_group",
            access_token=self.admin_user_tok,
            content={"localpart": "test"},
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])

        group_id = channel.json_body["group_id"]

        self._check_group(group_id, expect_code=200)

        # Invite/join another user

        url = "/groups/%s/admin/users/invite/%s" % (group_id, self.other_user)
        channel = self.make_request(
            "PUT", url.encode("ascii"), access_token=self.admin_user_tok, content={}
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])

        url = "/groups/%s/self/accept_invite" % (group_id,)
        channel = self.make_request(
            "PUT", url.encode("ascii"), access_token=self.other_user_token, content={}
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])

        # Check other user knows they're in the group
        self.assertIn(group_id, self._get_groups_user_is_in(self.admin_user_tok))
        self.assertIn(group_id, self._get_groups_user_is_in(self.other_user_token))

        # Now delete the group
        url = "/_synapse/admin/v1/delete_group/" + group_id
        channel = self.make_request(
            "POST",
            url.encode("ascii"),
            access_token=self.admin_user_tok,
            content={"localpart": "test"},
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])

        # Check group returns 404
        self._check_group(group_id, expect_code=404)

        # Check users don't think they're in the group
        self.assertNotIn(group_id, self._get_groups_user_is_in(self.admin_user_tok))
        self.assertNotIn(group_id, self._get_groups_user_is_in(self.other_user_token))

    def _check_group(self, group_id, expect_code):
        """Assert that trying to fetch the given group results in the given
        HTTP status code
        """

        url = "/groups/%s/profile" % (group_id,)
        channel = self.make_request(
            "GET", url.encode("ascii"), access_token=self.admin_user_tok
        )

        self.assertEqual(
            expect_code, int(channel.result["code"]), msg=channel.result["body"]
        )

    def _get_groups_user_is_in(self, access_token):
        """Returns the list of groups the user is in (given their access token)"""
        channel = self.make_request("GET", b"/joined_groups", access_token=access_token)

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])

        return channel.json_body["groups"]


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,
        room.register_servlets,
    ]

    def prepare(self, reactor, clock, hs):
        # Allow for uploading and downloading to/from the media repo
        self.media_repo = hs.get_media_repository_resource()
        self.download_resource = self.media_repo.children[b"download"]
        self.upload_resource = self.media_repo.children[b"upload"]
        self.image_data = unhexlify(
            b"89504e470d0a1a0a0000000d4948445200000001000000010806"
            b"0000001f15c4890000000a49444154789c63000100000500010d"
            b"0a2db40000000049454e44ae426082"
        )

    def make_homeserver(self, reactor, clock):

        self.fetches = []

        async def get_file(destination, path, output_stream, args=None, max_size=None):
            """
            Returns tuple[int,dict,str,int] of file length, response headers,
            absolute URI, and response code.
            """

            def write_to(r):
                data, response = r
                output_stream.write(data)
                return response

            d = Deferred()
            d.addCallback(write_to)
            self.fetches.append((d, destination, path, args))
            return await make_deferred_yieldable(d)

        client = Mock()
        client.get_file = get_file

        self.storage_path = self.mktemp()
        self.media_store_path = self.mktemp()
        os.mkdir(self.storage_path)
        os.mkdir(self.media_store_path)

        config = self.default_config()
        config["media_store_path"] = self.media_store_path
        config["thumbnail_requirements"] = {}
        config["max_image_pixels"] = 2000000

        provider_config = {
            "module": "synapse.rest.media.v1.storage_provider.FileStorageProviderBackend",
            "store_local": True,
            "store_synchronous": False,
            "store_remote": True,
            "config": {"directory": self.storage_path},
        }
        config["media_storage_providers"] = [provider_config]

        hs = self.setup_test_homeserver(config=config, federation_http_client=client)

        return hs

    def _ensure_quarantined(self, admin_user_tok, server_and_media_id):
        """Ensure a piece of media is quarantined when trying to access it."""
        channel = make_request(
            self.reactor,
            FakeSite(self.download_resource),
            "GET",
            server_and_media_id,
            shorthand=False,
            access_token=admin_user_tok,
        )

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

    def test_quarantine_media_requires_admin(self):
        self.register_user("nonadmin", "pass", admin=False)
        non_admin_user_tok = self.login("nonadmin", "pass")

        # Attempt quarantine media APIs as non-admin
        url = "/_synapse/admin/v1/media/quarantine/example.org/abcde12345"
        channel = self.make_request(
            "POST",
            url.encode("ascii"),
            access_token=non_admin_user_tok,
        )

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

        # And the roomID/userID endpoint
        url = "/_synapse/admin/v1/room/!room%3Aexample.com/media/quarantine"
        channel = self.make_request(
            "POST",
            url.encode("ascii"),
            access_token=non_admin_user_tok,
        )

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

    def test_quarantine_media_by_id(self):
        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(
            self.upload_resource, self.image_data, 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 = make_request(
            self.reactor,
            FakeSite(self.download_resource),
            "GET",
            server_name_and_media_id,
            shorthand=False,
            access_token=non_admin_user_tok,
        )

        # Should be successful
        self.assertEqual(200, int(channel.code), msg=channel.result["body"])

        # 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, int(channel.code), msg=channel.result["body"])

        # Attempt to access the media
        self._ensure_quarantined(admin_user_tok, server_name_and_media_id)

    def test_quarantine_all_media_in_room(self, override_url_template=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(
            self.upload_resource, self.image_data, tok=non_admin_user_tok
        )
        response_2 = self.helper.upload_media(
            self.upload_resource, self.image_data, 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,
        )

        # Quarantine all media in the room
        if override_url_template:
            url = override_url_template % urllib.parse.quote(room_id)
        else:
            url = "/_synapse/admin/v1/room/%s/media/quarantine" % urllib.parse.quote(
                room_id
            )
        channel = self.make_request(
            "POST",
            url,
            access_token=admin_user_tok,
        )
        self.pump(1.0)
        self.assertEqual(200, int(channel.code), msg=channel.result["body"])
        self.assertEqual(
            json.loads(channel.result["body"].decode("utf-8")),
            {"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
        self._ensure_quarantined(admin_user_tok, server_and_media_id_1)
        self._ensure_quarantined(admin_user_tok, server_and_media_id_2)

    def test_quarantine_all_media_in_room_deprecated_api_path(self):
        # Perform the above test with the deprecated API path
        self.test_quarantine_all_media_in_room("/_synapse/admin/v1/quarantine_media/%s")

    def test_quarantine_all_media_by_user(self):
        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(
            self.upload_resource, self.image_data, tok=non_admin_user_tok
        )
        response_2 = self.helper.upload_media(
            self.upload_resource, self.image_data, 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:]

        # 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, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(
            json.loads(channel.result["body"].decode("utf-8")),
            {"num_quarantined": 2},
            "Expected 2 quarantined items",
        )

        # Attempt to access each piece of media
        self._ensure_quarantined(admin_user_tok, server_and_media_id_1)
        self._ensure_quarantined(admin_user_tok, server_and_media_id_2)

    def test_cannot_quarantine_safe_media(self):
        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(
            self.upload_resource, self.image_data, tok=non_admin_user_tok
        )
        response_2 = self.helper.upload_media(
            self.upload_resource, self.image_data, 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, int(channel.code), msg=channel.result["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, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(
            json.loads(channel.result["body"].decode("utf-8")),
            {"num_quarantined": 1},
            "Expected 1 quarantined item",
        )

        # Attempt to access each piece of media, the first should fail, the
        # second should succeed.
        self._ensure_quarantined(admin_user_tok, server_and_media_id_1)

        # Attempt to access each piece of media
        channel = make_request(
            self.reactor,
            FakeSite(self.download_resource),
            "GET",
            server_and_media_id_2,
            shorthand=False,
            access_token=non_admin_user_tok,
        )

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