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![Erik Johnston](/assets/img/avatar_default.png)
Fixes up #17239 We need to keep the spam check within the `try/except` block. Also makes it so that we don't enter the top span twice. Also also ensures that we get the right thumbnail length.
373 lines
13 KiB
Python
373 lines
13 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2018-2021 The Matrix.org Foundation C.I.C.
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import contextlib
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import logging
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import os
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import shutil
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from types import TracebackType
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from typing import (
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IO,
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TYPE_CHECKING,
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Any,
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AsyncIterator,
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BinaryIO,
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Callable,
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Optional,
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Sequence,
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Tuple,
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Type,
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)
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import attr
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from twisted.internet.defer import Deferred
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from twisted.internet.interfaces import IConsumer
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from twisted.protocols.basic import FileSender
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from synapse.api.errors import NotFoundError
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from synapse.logging.context import defer_to_thread, make_deferred_yieldable
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from synapse.logging.opentracing import start_active_span, trace, trace_with_opname
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from synapse.util import Clock
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from synapse.util.file_consumer import BackgroundFileConsumer
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from ._base import FileInfo, Responder
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from .filepath import MediaFilePaths
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if TYPE_CHECKING:
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from synapse.media.storage_provider import StorageProvider
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class MediaStorage:
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"""Responsible for storing/fetching files from local sources.
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Args:
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hs
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local_media_directory: Base path where we store media on disk
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filepaths
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storage_providers: List of StorageProvider that are used to fetch and store files.
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"""
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def __init__(
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self,
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hs: "HomeServer",
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local_media_directory: str,
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filepaths: MediaFilePaths,
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storage_providers: Sequence["StorageProvider"],
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):
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self.hs = hs
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self.reactor = hs.get_reactor()
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self.local_media_directory = local_media_directory
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self.filepaths = filepaths
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self.storage_providers = storage_providers
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self._spam_checker_module_callbacks = hs.get_module_api_callbacks().spam_checker
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self.clock = hs.get_clock()
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@trace_with_opname("MediaStorage.store_file")
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async def store_file(self, source: IO, file_info: FileInfo) -> str:
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"""Write `source` to the on disk media store, and also any other
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configured storage providers
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Args:
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source: A file like object that should be written
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file_info: Info about the file to store
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Returns:
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the file path written to in the primary media store
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"""
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async with self.store_into_file(file_info) as (f, fname):
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# Write to the main media repository
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await self.write_to_file(source, f)
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return fname
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@trace_with_opname("MediaStorage.write_to_file")
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async def write_to_file(self, source: IO, output: IO) -> None:
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"""Asynchronously write the `source` to `output`."""
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await defer_to_thread(self.reactor, _write_file_synchronously, source, output)
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@trace_with_opname("MediaStorage.store_into_file")
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@contextlib.asynccontextmanager
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async def store_into_file(
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self, file_info: FileInfo
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) -> AsyncIterator[Tuple[BinaryIO, str]]:
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"""Async Context manager used to get a file like object to write into, as
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described by file_info.
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Actually yields a 2-tuple (file, fname,), where file is a file
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like object that can be written to and fname is the absolute path of file
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on disk.
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fname can be used to read the contents from after upload, e.g. to
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generate thumbnails.
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Args:
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file_info: Info about the file to store
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Example:
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async with media_storage.store_into_file(info) as (f, fname,):
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# .. write into f ...
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"""
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path = self._file_info_to_path(file_info)
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fname = os.path.join(self.local_media_directory, path)
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dirname = os.path.dirname(fname)
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os.makedirs(dirname, exist_ok=True)
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try:
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with start_active_span("writing to main media repo"):
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with open(fname, "wb") as f:
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yield f, fname
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with start_active_span("writing to other storage providers"):
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spam_check = (
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await self._spam_checker_module_callbacks.check_media_file_for_spam(
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ReadableFileWrapper(self.clock, fname), file_info
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)
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)
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if spam_check != self._spam_checker_module_callbacks.NOT_SPAM:
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logger.info("Blocking media due to spam checker")
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# Note that we'll delete the stored media, due to the
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# try/except below. The media also won't be stored in
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# the DB.
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# We currently ignore any additional field returned by
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# the spam-check API.
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raise SpamMediaException(errcode=spam_check[0])
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for provider in self.storage_providers:
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with start_active_span(str(provider)):
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await provider.store_file(path, file_info)
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except Exception as e:
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try:
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os.remove(fname)
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except Exception:
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pass
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raise e from None
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async def fetch_media(self, file_info: FileInfo) -> Optional[Responder]:
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"""Attempts to fetch media described by file_info from the local cache
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and configured storage providers.
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Args:
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file_info
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Returns:
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Returns a Responder if the file was found, otherwise None.
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"""
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paths = [self._file_info_to_path(file_info)]
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# fallback for remote thumbnails with no method in the filename
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if file_info.thumbnail and file_info.server_name:
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paths.append(
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self.filepaths.remote_media_thumbnail_rel_legacy(
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server_name=file_info.server_name,
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file_id=file_info.file_id,
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width=file_info.thumbnail.width,
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height=file_info.thumbnail.height,
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content_type=file_info.thumbnail.type,
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)
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)
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for path in paths:
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local_path = os.path.join(self.local_media_directory, path)
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if os.path.exists(local_path):
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logger.debug("responding with local file %s", local_path)
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return FileResponder(open(local_path, "rb"))
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logger.debug("local file %s did not exist", local_path)
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for provider in self.storage_providers:
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for path in paths:
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res: Any = await provider.fetch(path, file_info)
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if res:
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logger.debug("Streaming %s from %s", path, provider)
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return res
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logger.debug("%s not found on %s", path, provider)
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return None
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@trace
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async def ensure_media_is_in_local_cache(self, file_info: FileInfo) -> str:
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"""Ensures that the given file is in the local cache. Attempts to
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download it from storage providers if it isn't.
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Args:
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file_info
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Returns:
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Full path to local file
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"""
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path = self._file_info_to_path(file_info)
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local_path = os.path.join(self.local_media_directory, path)
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if os.path.exists(local_path):
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return local_path
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# Fallback for paths without method names
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# Should be removed in the future
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if file_info.thumbnail and file_info.server_name:
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legacy_path = self.filepaths.remote_media_thumbnail_rel_legacy(
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server_name=file_info.server_name,
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file_id=file_info.file_id,
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width=file_info.thumbnail.width,
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height=file_info.thumbnail.height,
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content_type=file_info.thumbnail.type,
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)
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legacy_local_path = os.path.join(self.local_media_directory, legacy_path)
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if os.path.exists(legacy_local_path):
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return legacy_local_path
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dirname = os.path.dirname(local_path)
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os.makedirs(dirname, exist_ok=True)
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for provider in self.storage_providers:
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res: Any = await provider.fetch(path, file_info)
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if res:
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with res:
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consumer = BackgroundFileConsumer(
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open(local_path, "wb"), self.reactor
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)
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await res.write_to_consumer(consumer)
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await consumer.wait()
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return local_path
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raise NotFoundError()
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@trace
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def _file_info_to_path(self, file_info: FileInfo) -> str:
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"""Converts file_info into a relative path.
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The path is suitable for storing files under a directory, e.g. used to
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store files on local FS under the base media repository directory.
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"""
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if file_info.url_cache:
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if file_info.thumbnail:
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return self.filepaths.url_cache_thumbnail_rel(
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media_id=file_info.file_id,
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width=file_info.thumbnail.width,
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height=file_info.thumbnail.height,
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content_type=file_info.thumbnail.type,
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method=file_info.thumbnail.method,
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)
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return self.filepaths.url_cache_filepath_rel(file_info.file_id)
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if file_info.server_name:
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if file_info.thumbnail:
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return self.filepaths.remote_media_thumbnail_rel(
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server_name=file_info.server_name,
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file_id=file_info.file_id,
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width=file_info.thumbnail.width,
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height=file_info.thumbnail.height,
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content_type=file_info.thumbnail.type,
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method=file_info.thumbnail.method,
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)
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return self.filepaths.remote_media_filepath_rel(
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file_info.server_name, file_info.file_id
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)
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if file_info.thumbnail:
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return self.filepaths.local_media_thumbnail_rel(
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media_id=file_info.file_id,
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width=file_info.thumbnail.width,
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height=file_info.thumbnail.height,
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content_type=file_info.thumbnail.type,
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method=file_info.thumbnail.method,
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)
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return self.filepaths.local_media_filepath_rel(file_info.file_id)
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@trace
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def _write_file_synchronously(source: IO, dest: IO) -> None:
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"""Write `source` to the file like `dest` synchronously. Should be called
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from a thread.
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Args:
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source: A file like object that's to be written
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dest: A file like object to be written to
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"""
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source.seek(0) # Ensure we read from the start of the file
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shutil.copyfileobj(source, dest)
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class FileResponder(Responder):
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"""Wraps an open file that can be sent to a request.
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Args:
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open_file: A file like object to be streamed ot the client,
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is closed when finished streaming.
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"""
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def __init__(self, open_file: IO):
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self.open_file = open_file
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def write_to_consumer(self, consumer: IConsumer) -> Deferred:
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return make_deferred_yieldable(
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FileSender().beginFileTransfer(self.open_file, consumer)
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)
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def __exit__(
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self,
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exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType],
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) -> None:
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self.open_file.close()
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class SpamMediaException(NotFoundError):
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"""The media was blocked by a spam checker, so we simply 404 the request (in
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the same way as if it was quarantined).
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"""
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@attr.s(slots=True, auto_attribs=True)
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class ReadableFileWrapper:
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"""Wrapper that allows reading a file in chunks, yielding to the reactor,
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and writing to a callback.
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This is simplified `FileSender` that takes an IO object rather than an
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`IConsumer`.
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"""
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CHUNK_SIZE = 2**14
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clock: Clock
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path: str
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async def write_chunks_to(self, callback: Callable[[bytes], object]) -> None:
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"""Reads the file in chunks and calls the callback with each chunk."""
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with open(self.path, "rb") as file:
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while True:
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chunk = file.read(self.CHUNK_SIZE)
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if not chunk:
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break
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callback(chunk)
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# We yield to the reactor by sleeping for 0 seconds.
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await self.clock.sleep(0)
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