376 lines
13 KiB
Python
376 lines
13 KiB
Python
# Copyright 2018-2021 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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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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Awaitable,
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BinaryIO,
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Callable,
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Generator,
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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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import synapse
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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.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.server import HomeServer
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from .storage_provider import StorageProviderWrapper
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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["StorageProviderWrapper"],
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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 = hs.get_spam_checker()
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self.clock = hs.get_clock()
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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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with self.store_into_file(file_info) as (f, fname, finish_cb):
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# Write to the main repository
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await self.write_to_file(source, f)
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await finish_cb()
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return fname
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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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@contextlib.contextmanager
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def store_into_file(
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self, file_info: FileInfo
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) -> Generator[Tuple[BinaryIO, str, Callable[[], Awaitable[None]]], None, None]:
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"""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 3-tuple (file, fname, finish_cb), where file is a file
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like object that can be written to, fname is the absolute path of file
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on disk, and finish_cb is a function that returns an awaitable.
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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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finish_cb must be called and waited on after the file has been
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successfully been written to. Should not be called if there was an
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error.
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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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with media_storage.store_into_file(info) as (f, fname, finish_cb):
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# .. write into f ...
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await finish_cb()
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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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finished_called = [False]
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try:
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with open(fname, "wb") as f:
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async def finish() -> None:
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# Ensure that all writes have been flushed and close the
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# file.
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f.flush()
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f.close()
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spam_check = await self.spam_checker.check_media_file_for_spam(
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ReadableFileWrapper(self.clock, fname), file_info
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)
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if spam_check != synapse.module_api.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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await provider.store_file(path, file_info)
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finished_called[0] = True
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yield f, fname, finish
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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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if not finished_called:
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raise Exception("Finished callback not called")
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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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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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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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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], None]) -> 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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