diff options
| -rw-r--r-- | changelog.d/17256.feature | 1 | ||||
| -rw-r--r-- | docs/usage/configuration/config_documentation.md | 18 | ||||
| -rw-r--r-- | synapse/config/ratelimiting.py | 10 | ||||
| -rw-r--r-- | synapse/federation/federation_client.py | 7 | ||||
| -rw-r--r-- | synapse/federation/transport/client.py | 9 | ||||
| -rw-r--r-- | synapse/http/matrixfederationclient.py | 55 | ||||
| -rw-r--r-- | synapse/media/media_repository.py | 43 | ||||
| -rw-r--r-- | synapse/media/thumbnailer.py | 6 | ||||
| -rw-r--r-- | synapse/rest/client/media.py | 2 | ||||
| -rw-r--r-- | synapse/rest/media/download_resource.py | 8 | ||||
| -rw-r--r-- | synapse/rest/media/thumbnail_resource.py | 2 | ||||
| -rw-r--r-- | tests/media/test_media_storage.py | 225 |
12 files changed, 372 insertions, 14 deletions
diff --git a/changelog.d/17256.feature b/changelog.d/17256.feature new file mode 100644 index 0000000000..6ec4cb7a31 --- /dev/null +++ b/changelog.d/17256.feature @@ -0,0 +1 @@ + Improve ratelimiting in Synapse (#17256). \ No newline at end of file diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md index 2c917d1f8e..d23f8c4c4f 100644 --- a/docs/usage/configuration/config_documentation.md +++ b/docs/usage/configuration/config_documentation.md @@ -1946,6 +1946,24 @@ Example configuration: max_image_pixels: 35M ``` --- +### `remote_media_download_burst_count` + +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, ie a given number of bytes have already been downloaded, further downloads will be denied until the bucket drains. Defaults to 500MiB. 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. + +Example configuration: +```yaml +remote_media_download_burst_count: 200M +``` +--- +### `remote_media_download_per_second` + +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`. + +Example configuration: +```yaml +remote_media_download_per_second: 40K +``` +--- ### `prevent_media_downloads_from` A list of domains to never download media from. Media from these diff --git a/synapse/config/ratelimiting.py b/synapse/config/ratelimiting.py index d2cb4576df..3fa33f5373 100644 --- a/synapse/config/ratelimiting.py +++ b/synapse/config/ratelimiting.py @@ -218,3 +218,13 @@ class RatelimitConfig(Config): "rc_media_create", defaults={"per_second": 10, "burst_count": 50}, ) + + self.remote_media_downloads = RatelimitSettings( + key="rc_remote_media_downloads", + per_second=self.parse_size( + config.get("remote_media_download_per_second", "87K") + ), + burst_count=self.parse_size( + config.get("remote_media_download_burst_count", "500M") + ), + ) diff --git a/synapse/federation/federation_client.py b/synapse/federation/federation_client.py index e613eb87a6..f0f5a37a57 100644 --- a/synapse/federation/federation_client.py +++ b/synapse/federation/federation_client.py @@ -56,6 +56,7 @@ from synapse.api.errors import ( SynapseError, UnsupportedRoomVersionError, ) +from synapse.api.ratelimiting import Ratelimiter from synapse.api.room_versions import ( KNOWN_ROOM_VERSIONS, EventFormatVersions, @@ -1877,6 +1878,8 @@ class FederationClient(FederationBase): output_stream: BinaryIO, max_size: int, max_timeout_ms: int, + download_ratelimiter: Ratelimiter, + ip_address: str, ) -> Tuple[int, Dict[bytes, List[bytes]]]: try: return await self.transport_layer.download_media_v3( @@ -1885,6 +1888,8 @@ class FederationClient(FederationBase): output_stream=output_stream, max_size=max_size, max_timeout_ms=max_timeout_ms, + download_ratelimiter=download_ratelimiter, + ip_address=ip_address, ) except HttpResponseException as e: # If an error is received that is due to an unrecognised endpoint, @@ -1905,6 +1910,8 @@ class FederationClient(FederationBase): output_stream=output_stream, max_size=max_size, max_timeout_ms=max_timeout_ms, + download_ratelimiter=download_ratelimiter, + ip_address=ip_address, ) diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py index de408f7f8d..af1336fe5f 100644 --- a/synapse/federation/transport/client.py +++ b/synapse/federation/transport/client.py @@ -43,6 +43,7 @@ import ijson from synapse.api.constants import Direction, Membership from synapse.api.errors import Codes, HttpResponseException, SynapseError +from synapse.api.ratelimiting import Ratelimiter from synapse.api.room_versions import RoomVersion from synapse.api.urls import ( FEDERATION_UNSTABLE_PREFIX, @@ -819,6 +820,8 @@ class TransportLayerClient: output_stream: BinaryIO, max_size: int, max_timeout_ms: int, + download_ratelimiter: Ratelimiter, + ip_address: str, ) -> Tuple[int, Dict[bytes, List[bytes]]]: path = f"/_matrix/media/r0/download/{destination}/{media_id}" @@ -834,6 +837,8 @@ class TransportLayerClient: "allow_remote": "false", "timeout_ms": str(max_timeout_ms), }, + download_ratelimiter=download_ratelimiter, + ip_address=ip_address, ) async def download_media_v3( @@ -843,6 +848,8 @@ class TransportLayerClient: output_stream: BinaryIO, max_size: int, max_timeout_ms: int, + download_ratelimiter: Ratelimiter, + ip_address: str, ) -> Tuple[int, Dict[bytes, List[bytes]]]: path = f"/_matrix/media/v3/download/{destination}/{media_id}" @@ -862,6 +869,8 @@ class TransportLayerClient: "allow_redirect": "true", }, follow_redirects=True, + download_ratelimiter=download_ratelimiter, + ip_address=ip_address, ) diff --git a/synapse/http/matrixfederationclient.py b/synapse/http/matrixfederationclient.py index c73a589e6c..104b803b0f 100644 --- a/synapse/http/matrixfederationclient.py +++ b/synapse/http/matrixfederationclient.py @@ -57,7 +57,7 @@ from twisted.internet.interfaces import IReactorTime from twisted.internet.task import Cooperator from twisted.web.client import ResponseFailed from twisted.web.http_headers import Headers -from twisted.web.iweb import IAgent, IBodyProducer, IResponse +from twisted.web.iweb import UNKNOWN_LENGTH, IAgent, IBodyProducer, IResponse import synapse.metrics import synapse.util.retryutils @@ -68,6 +68,7 @@ from synapse.api.errors import ( RequestSendFailed, SynapseError, ) +from synapse.api.ratelimiting import Ratelimiter from synapse.crypto.context_factory import FederationPolicyForHTTPS from synapse.http import QuieterFileBodyProducer from synapse.http.client import ( @@ -1411,9 +1412,11 @@ class MatrixFederationHttpClient: destination: str, path: str, output_stream: BinaryIO, + download_ratelimiter: Ratelimiter, + ip_address: str, + max_size: int, args: Optional[QueryParams] = None, retry_on_dns_fail: bool = True, - max_size: Optional[int] = None, ignore_backoff: bool = False, follow_redirects: bool = False, ) -> Tuple[int, Dict[bytes, List[bytes]]]: @@ -1422,6 +1425,10 @@ class MatrixFederationHttpClient: destination: The remote server to send the HTTP request to. path: The HTTP path to GET. output_stream: File to write the response body to. + download_ratelimiter: a ratelimiter to limit remote media downloads, keyed to + requester IP + ip_address: IP address of the requester + max_size: maximum allowable size in bytes of the file args: Optional dictionary used to create the query string. ignore_backoff: true to ignore the historical backoff data and try the request anyway. @@ -1441,11 +1448,27 @@ class MatrixFederationHttpClient: federation whitelist RequestSendFailed: If there were problems connecting to the remote, due to e.g. DNS failures, connection timeouts etc. + SynapseError: If the requested file exceeds ratelimits """ request = MatrixFederationRequest( method="GET", destination=destination, path=path, query=args ) + # check for a minimum balance of 1MiB in ratelimiter before initiating request + send_req, _ = await download_ratelimiter.can_do_action( + requester=None, key=ip_address, n_actions=1048576, update=False + ) + + if not send_req: + msg = "Requested file size exceeds ratelimits" + logger.warning( + "{%s} [%s] %s", + request.txn_id, + request.destination, + msg, + ) + raise SynapseError(HTTPStatus.TOO_MANY_REQUESTS, msg, Codes.LIMIT_EXCEEDED) + response = await self._send_request( request, retry_on_dns_fail=retry_on_dns_fail, @@ -1455,12 +1478,36 @@ class MatrixFederationHttpClient: headers = dict(response.headers.getAllRawHeaders()) + expected_size = response.length + # if we don't get an expected length then use the max length + if expected_size == UNKNOWN_LENGTH: + expected_size = max_size + logger.debug( + f"File size unknown, assuming file is max allowable size: {max_size}" + ) + + read_body, _ = await download_ratelimiter.can_do_action( + requester=None, + key=ip_address, + n_actions=expected_size, + ) + if not read_body: + msg = "Requested file size exceeds ratelimits" + logger.warning( + "{%s} [%s] %s", + request.txn_id, + request.destination, + msg, + ) + raise SynapseError(HTTPStatus.TOO_MANY_REQUESTS, msg, Codes.LIMIT_EXCEEDED) + try: - d = read_body_with_max_size(response, output_stream, max_size) + # add a byte of headroom to max size as function errs at >= + d = read_body_with_max_size(response, output_stream, expected_size + 1) d.addTimeout(self.default_timeout_seconds, self.reactor) length = await make_deferred_yieldable(d) except BodyExceededMaxSize: - msg = "Requested file is too large > %r bytes" % (max_size,) + msg = "Requested file is too large > %r bytes" % (expected_size,) logger.warning( "{%s} [%s] %s", request.txn_id, diff --git a/synapse/media/media_repository.py b/synapse/media/media_repository.py index 9c29e09653..6ed56099ca 100644 --- a/synapse/media/media_repository.py +++ b/synapse/media/media_repository.py @@ -42,6 +42,7 @@ from synapse.api.errors import ( SynapseError, cs_error, ) +from synapse.api.ratelimiting import Ratelimiter from synapse.config.repository import ThumbnailRequirement from synapse.http.server import respond_with_json from synapse.http.site import SynapseRequest @@ -111,6 +112,12 @@ class MediaRepository: ) self.prevent_media_downloads_from = hs.config.media.prevent_media_downloads_from + self.download_ratelimiter = Ratelimiter( + store=hs.get_storage_controllers().main, + clock=hs.get_clock(), + cfg=hs.config.ratelimiting.remote_media_downloads, + ) + # List of StorageProviders where we should search for media and # potentially upload to. storage_providers = [] @@ -464,6 +471,7 @@ class MediaRepository: media_id: str, name: Optional[str], max_timeout_ms: int, + ip_address: str, ) -> None: """Respond to requests for remote media. @@ -475,6 +483,7 @@ class MediaRepository: the filename in the Content-Disposition header of the response. max_timeout_ms: the maximum number of milliseconds to wait for the media to be uploaded. + ip_address: the IP address of the requester Returns: Resolves once a response has successfully been written to request @@ -500,7 +509,11 @@ class MediaRepository: key = (server_name, media_id) async with self.remote_media_linearizer.queue(key): responder, media_info = await self._get_remote_media_impl( - server_name, media_id, max_timeout_ms + server_name, + media_id, + max_timeout_ms, + self.download_ratelimiter, + ip_address, ) # We deliberately stream the file outside the lock @@ -517,7 +530,7 @@ class MediaRepository: respond_404(request) async def get_remote_media_info( - self, server_name: str, media_id: str, max_timeout_ms: int + self, server_name: str, media_id: str, max_timeout_ms: int, ip_address: str ) -> RemoteMedia: """Gets the media info associated with the remote file, downloading if necessary. @@ -527,6 +540,7 @@ class MediaRepository: media_id: The media ID of the content (as defined by the remote server). max_timeout_ms: the maximum number of milliseconds to wait for the media to be uploaded. + ip_address: IP address of the requester Returns: The media info of the file @@ -542,7 +556,11 @@ class MediaRepository: key = (server_name, media_id) async with self.remote_media_linearizer.queue(key): responder, media_info = await self._get_remote_media_impl( - server_name, media_id, max_timeout_ms + server_name, + media_id, + max_timeout_ms, + self.download_ratelimiter, + ip_address, ) # Ensure we actually use the responder so that it releases resources @@ -553,7 +571,12 @@ class MediaRepository: return media_info async def _get_remote_media_impl( - self, server_name: str, media_id: str, max_timeout_ms: int + self, + server_name: str, + media_id: str, + max_timeout_ms: int, + download_ratelimiter: Ratelimiter, + ip_address: str, ) -> Tuple[Optional[Responder], RemoteMedia]: """Looks for media in local cache, if not there then attempt to download from remote server. @@ -564,6 +587,9 @@ class MediaRepository: remote server). max_timeout_ms: the maximum number of milliseconds to wait for the media to be uploaded. + download_ratelimiter: a ratelimiter limiting remote media downloads, keyed to + requester IP. + ip_address: the IP address of the requester Returns: A tuple of responder and the media info of the file. @@ -596,7 +622,7 @@ class MediaRepository: try: media_info = await self._download_remote_file( - server_name, media_id, max_timeout_ms + server_name, media_id, max_timeout_ms, download_ratelimiter, ip_address ) except SynapseError: raise @@ -630,6 +656,8 @@ class MediaRepository: server_name: str, media_id: str, max_timeout_ms: int, + download_ratelimiter: Ratelimiter, + ip_address: str, ) -> RemoteMedia: """Attempt to download the remote file from the given server name, using the given file_id as the local id. @@ -641,6 +669,9 @@ class MediaRepository: locally generated. max_timeout_ms: the maximum number of milliseconds to wait for the media to be uploaded. + download_ratelimiter: a ratelimiter limiting remote media downloads, keyed to + requester IP + ip_address: the IP address of the requester Returns: The media info of the file. @@ -658,6 +689,8 @@ class MediaRepository: output_stream=f, max_size=self.max_upload_size, max_timeout_ms=max_timeout_ms, + download_ratelimiter=download_ratelimiter, + ip_address=ip_address, ) except RequestSendFailed as e: logger.warning( diff --git a/synapse/media/thumbnailer.py b/synapse/media/thumbnailer.py index cc3acf51e1..f8a9560784 100644 --- a/synapse/media/thumbnailer.py +++ b/synapse/media/thumbnailer.py @@ -359,9 +359,10 @@ class ThumbnailProvider: desired_method: str, desired_type: str, max_timeout_ms: int, + ip_address: str, ) -> None: media_info = await self.media_repo.get_remote_media_info( - server_name, media_id, max_timeout_ms + server_name, media_id, max_timeout_ms, ip_address ) if not media_info: respond_404(request) @@ -422,12 +423,13 @@ class ThumbnailProvider: method: str, m_type: str, max_timeout_ms: int, + ip_address: str, ) -> None: # TODO: Don't download the whole remote file # We should proxy the thumbnail from the remote server instead of # downloading the remote file and generating our own thumbnails. media_info = await self.media_repo.get_remote_media_info( - server_name, media_id, max_timeout_ms + server_name, media_id, max_timeout_ms, ip_address ) if not media_info: return diff --git a/synapse/rest/client/media.py b/synapse/rest/client/media.py index 172d240783..0c089163c1 100644 --- a/synapse/rest/client/media.py +++ b/synapse/rest/client/media.py @@ -174,6 +174,7 @@ class UnstableThumbnailResource(RestServlet): respond_404(request) return + ip_address = request.getClientAddress().host remote_resp_function = ( self.thumbnailer.select_or_generate_remote_thumbnail if self.dynamic_thumbnails @@ -188,6 +189,7 @@ class UnstableThumbnailResource(RestServlet): method, m_type, max_timeout_ms, + ip_address, ) self.media_repo.mark_recently_accessed(server_name, media_id) diff --git a/synapse/rest/media/download_resource.py b/synapse/rest/media/download_resource.py index 8ba723c8d4..1628d58926 100644 --- a/synapse/rest/media/download_resource.py +++ b/synapse/rest/media/download_resource.py @@ -97,6 +97,12 @@ class DownloadResource(RestServlet): respond_404(request) return + ip_address = request.getClientAddress().host await self.media_repo.get_remote_media( - request, server_name, media_id, file_name, max_timeout_ms + request, + server_name, + media_id, + file_name, + max_timeout_ms, + ip_address, ) diff --git a/synapse/rest/media/thumbnail_resource.py b/synapse/rest/media/thumbnail_resource.py index fe8fbb06e4..ce511c6dce 100644 --- a/synapse/rest/media/thumbnail_resource.py +++ b/synapse/rest/media/thumbnail_resource.py @@ -104,6 +104,7 @@ class ThumbnailResource(RestServlet): respond_404(request) return + ip_address = request.getClientAddress().host remote_resp_function = ( self.thumbnail_provider.select_or_generate_remote_thumbnail if self.dynamic_thumbnails @@ -118,5 +119,6 @@ class ThumbnailResource(RestServlet): method, m_type, max_timeout_ms, + ip_address, ) self.media_repo.mark_recently_accessed(server_name, media_id) diff --git a/tests/media/test_media_storage.py b/tests/media/test_media_storage.py index 1bd51ceba2..46d20ce775 100644 --- a/tests/media/test_media_storage.py +++ b/tests/media/test_media_storage.py @@ -25,7 +25,7 @@ import tempfile from binascii import unhexlify from io import BytesIO from typing import Any, BinaryIO, ClassVar, Dict, List, Optional, Tuple, Union -from unittest.mock import Mock +from unittest.mock import MagicMock, Mock, patch from urllib import parse import attr @@ -37,9 +37,12 @@ from twisted.internet import defer from twisted.internet.defer import Deferred from twisted.python.failure import Failure from twisted.test.proto_helpers import MemoryReactor +from twisted.web.http_headers import Headers +from twisted.web.iweb import UNKNOWN_LENGTH, IResponse from twisted.web.resource import Resource from synapse.api.errors import Codes, HttpResponseException +from synapse.api.ratelimiting import Ratelimiter from synapse.events import EventBase from synapse.http.types import QueryParams from synapse.logging.context import make_deferred_yieldable @@ -59,6 +62,7 @@ from synapse.util import Clock from tests import unittest from tests.server import FakeChannel from tests.test_utils import SMALL_PNG +from tests.unittest import override_config from tests.utils import default_config @@ -251,9 +255,11 @@ class MediaRepoTests(unittest.HomeserverTestCase): destination: str, path: str, output_stream: BinaryIO, + download_ratelimiter: Ratelimiter, + ip_address: Any, + max_size: int, args: Optional[QueryParams] = None, retry_on_dns_fail: bool = True, - max_size: Optional[int] = None, ignore_backoff: bool = False, follow_redirects: bool = False, ) -> "Deferred[Tuple[int, Dict[bytes, List[bytes]]]]": @@ -878,3 +884,218 @@ class SpamCheckerTestCase(unittest.HomeserverTestCase): tok=self.tok, expect_code=400, ) + + +class RemoteDownloadLimiterTestCase(unittest.HomeserverTestCase): + def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer: + config = self.default_config() + + self.storage_path = self.mktemp() + self.media_store_path = self.mktemp() + os.mkdir(self.storage_path) + os.mkdir(self.media_store_path) + config["media_store_path"] = self.media_store_path + + provider_config = { + "module": "synapse.media.storage_provider.FileStorageProviderBackend", + "store_local": True, + "store_synchronous": False, + "store_remote": True, + "config": {"directory": self.storage_path}, + } + + config["media_storage_providers"] = [provider_config] + + return self.setup_test_homeserver(config=config) + + def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None: + self.repo = hs.get_media_repository() + self.client = hs.get_federation_http_client() + self.store = hs.get_datastores().main + + def create_resource_dict(self) -> Dict[str, Resource]: + # We need to manually set the resource tree to include media, the + # default only does `/_matrix/client` APIs. + return {"/_matrix/media": self.hs.get_media_repository_resource()} + + # mock actually reading file body + def read_body_with_max_size_30MiB(*args: Any, **kwargs: Any) -> Deferred: + d: Deferred = defer.Deferred() + d.callback(31457280) + return d + + def read_body_with_max_size_50MiB(*args: Any, **kwargs: Any) -> Deferred: + d: Deferred = defer.Deferred() + d.callback(52428800) + return d + + @patch( + "synapse.http.matrixfederationclient.read_body_with_max_size", + read_body_with_max_size_30MiB, + ) + def test_download_ratelimit_default(self) -> None: + """ + Test remote media download ratelimiting against default configuration - 500MB bucket + and 87kb/second drain rate + """ + + # mock out actually sending the request, returns a 30MiB response + async def _send_request(*args: Any, **kwargs: Any) -> IResponse: + resp = MagicMock(spec=IResponse) + resp.code = 200 + resp.length = 31457280 + resp.headers = Headers({"Content-Type": ["application/octet-stream"]}) + resp.phrase = b"OK" + return resp + + self.client._send_request = _send_request # type: ignore + + # first request should go through + channel = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxyz", + shorthand=False, + ) + assert channel.code == 200 + + # next 15 should go through + for i in range(15): + channel2 = self.make_request( + "GET", + f"/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxy{i}", + shorthand=False, + ) + assert channel2.code == 200 + + # 17th will hit ratelimit + channel3 = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxyx", + shorthand=False, + ) + assert channel3.code == 429 + + # however, a request from a different IP will go through + channel4 = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxyz", + shorthand=False, + client_ip="187.233.230.159", + ) + assert channel4.code == 200 + + # at 87Kib/s it should take about 2 minutes for enough to drain from bucket that another + # 30MiB download is authorized - The last download was blocked at 503,316,480. + # The next download will be authorized when bucket hits 492,830,720 + # (524,288,000 total capacity - 31,457,280 download size) so 503,316,480 - 492,830,720 ~= 10,485,760 + # needs to drain before another download will be authorized, that will take ~= + # 2 minutes (10,485,760/89,088/60) + self.reactor.pump([2.0 * 60.0]) + + # enough has drained and next request goes through + channel5 = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxyb", + shorthand=False, + ) + assert channel5.code == 200 + + @override_config( + { + "remote_media_download_per_second": "50M", + "remote_media_download_burst_count": "50M", + } + ) + @patch( + "synapse.http.matrixfederationclient.read_body_with_max_size", + read_body_with_max_size_50MiB, + ) + def test_download_rate_limit_config(self) -> None: + """ + Test that download rate limit config options are correctly picked up and applied + """ + + async def _send_request(*args: Any, **kwargs: Any) -> IResponse: + resp = MagicMock(spec=IResponse) + resp.code = 200 + resp.length = 52428800 + resp.headers = Headers({"Content-Type": ["application/octet-stream"]}) + resp.phrase = b"OK" + return resp + + self.client._send_request = _send_request # type: ignore + + # first request should go through + channel = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxyz", + shorthand=False, + ) + assert channel.code == 200 + + # immediate second request should fail + channel = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxy1", + shorthand=False, + ) + assert channel.code == 429 + + # advance half a second + self.reactor.pump([0.5]) + + # request still fails + channel = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxy2", + shorthand=False, + ) + assert channel.code == 429 + + # advance another half second + self.reactor.pump([0.5]) + + # enough has drained from bucket and request is successful + channel = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxy3", + shorthand=False, + ) + assert channel.code == 200 + + @patch( + "synapse.http.matrixfederationclient.read_body_with_max_size", + read_body_with_max_size_30MiB, + ) + def test_download_ratelimit_max_size_sub(self) -> None: + """ + Test that if no content-length is provided, the default max size is applied instead + """ + + # mock out actually sending the request + async def _send_request(*args: Any, **kwargs: Any) -> IResponse: + resp = MagicMock(spec=IResponse) + resp.code = 200 + resp.length = UNKNOWN_LENGTH + resp.headers = Headers({"Content-Type": ["application/octet-stream"]}) + resp.phrase = b"OK" + return resp + + self.client._send_request = _send_request # type: ignore + + # ten requests should go through using the max size (500MB/50MB) + for i in range(10): + channel2 = self.make_request( + "GET", + f"/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxy{i}", + shorthand=False, + ) + assert channel2.code == 200 + + # eleventh will hit ratelimit + channel3 = self.make_request( + "GET", + "/_matrix/media/v3/download/remote.org/abcdefghijklmnopqrstuvwxyx", + shorthand=False, + ) + assert channel3.code == 429 |