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![Erik Johnston](/assets/img/avatar_default.png)
During the migration the automated script to update the copyright headers accidentally got rid of some of the existing copyright lines. Reinstate them.
502 lines
15 KiB
Python
502 lines
15 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 2019-2021 The Matrix.org Foundation C.I.C.
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# Copyright 2014-2016 OpenMarket Ltd
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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 logging
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import os
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import urllib
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from abc import ABC, abstractmethod
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from types import TracebackType
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from typing import Awaitable, Dict, Generator, List, Optional, Tuple, Type
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import attr
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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 twisted.web.server import Request
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from synapse.api.errors import Codes, cs_error
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from synapse.http.server import finish_request, respond_with_json
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from synapse.http.site import SynapseRequest
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from synapse.logging.context import make_deferred_yieldable
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from synapse.util.stringutils import is_ascii
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logger = logging.getLogger(__name__)
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# list all text content types that will have the charset default to UTF-8 when
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# none is given
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TEXT_CONTENT_TYPES = [
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"text/css",
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"text/csv",
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"text/html",
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"text/calendar",
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"text/plain",
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"text/javascript",
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"application/json",
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"application/ld+json",
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"application/rtf",
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"image/svg+xml",
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"text/xml",
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]
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# A list of all content types that are "safe" to be rendered inline in a browser.
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INLINE_CONTENT_TYPES = [
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"text/css",
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"text/plain",
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"text/csv",
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"application/json",
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"application/ld+json",
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# We allow some media files deemed as safe, which comes from the matrix-react-sdk.
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# https://github.com/matrix-org/matrix-react-sdk/blob/a70fcfd0bcf7f8c85986da18001ea11597989a7c/src/utils/blobs.ts#L51
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# SVGs are *intentionally* omitted.
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"image/jpeg",
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"image/gif",
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"image/png",
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"image/apng",
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"image/webp",
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"image/avif",
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"video/mp4",
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"video/webm",
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"video/ogg",
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"video/quicktime",
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"audio/mp4",
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"audio/webm",
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"audio/aac",
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"audio/mpeg",
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"audio/ogg",
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"audio/wave",
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"audio/wav",
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"audio/x-wav",
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"audio/x-pn-wav",
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"audio/flac",
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"audio/x-flac",
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]
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# Default timeout_ms for download and thumbnail requests
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DEFAULT_MAX_TIMEOUT_MS = 20_000
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# Maximum allowed timeout_ms for download and thumbnail requests
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MAXIMUM_ALLOWED_MAX_TIMEOUT_MS = 60_000
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def respond_404(request: SynapseRequest) -> None:
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assert request.path is not None
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respond_with_json(
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request,
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404,
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cs_error("Not found '%s'" % (request.path.decode(),), code=Codes.NOT_FOUND),
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send_cors=True,
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)
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async def respond_with_file(
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request: SynapseRequest,
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media_type: str,
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file_path: str,
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file_size: Optional[int] = None,
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upload_name: Optional[str] = None,
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) -> None:
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logger.debug("Responding with %r", file_path)
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if os.path.isfile(file_path):
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if file_size is None:
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stat = os.stat(file_path)
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file_size = stat.st_size
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add_file_headers(request, media_type, file_size, upload_name)
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with open(file_path, "rb") as f:
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await make_deferred_yieldable(FileSender().beginFileTransfer(f, request))
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finish_request(request)
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else:
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respond_404(request)
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def add_file_headers(
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request: Request,
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media_type: str,
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file_size: Optional[int],
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upload_name: Optional[str],
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) -> None:
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"""Adds the correct response headers in preparation for responding with the
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media.
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Args:
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request
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media_type: The media/content type.
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file_size: Size in bytes of the media, if known.
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upload_name: The name of the requested file, if any.
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"""
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def _quote(x: str) -> str:
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return urllib.parse.quote(x.encode("utf-8"))
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# Default to a UTF-8 charset for text content types.
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# ex, uses UTF-8 for 'text/css' but not 'text/css; charset=UTF-16'
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if media_type.lower() in TEXT_CONTENT_TYPES:
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content_type = media_type + "; charset=UTF-8"
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else:
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content_type = media_type
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request.setHeader(b"Content-Type", content_type.encode("UTF-8"))
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# A strict subset of content types is allowed to be inlined so that they may
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# be viewed directly in a browser. Other file types are forced to be downloads.
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#
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# Only the type & subtype are important, parameters can be ignored.
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if media_type.lower().split(";", 1)[0] in INLINE_CONTENT_TYPES:
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disposition = "inline"
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else:
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disposition = "attachment"
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if upload_name:
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# RFC6266 section 4.1 [1] defines both `filename` and `filename*`.
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#
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# `filename` is defined to be a `value`, which is defined by RFC2616
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# section 3.6 [2] to be a `token` or a `quoted-string`, where a `token`
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# is (essentially) a single US-ASCII word, and a `quoted-string` is a
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# US-ASCII string surrounded by double-quotes, using backslash as an
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# escape character. Note that %-encoding is *not* permitted.
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#
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# `filename*` is defined to be an `ext-value`, which is defined in
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# RFC5987 section 3.2.1 [3] to be `charset "'" [ language ] "'" value-chars`,
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# where `value-chars` is essentially a %-encoded string in the given charset.
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#
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# [1]: https://tools.ietf.org/html/rfc6266#section-4.1
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# [2]: https://tools.ietf.org/html/rfc2616#section-3.6
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# [3]: https://tools.ietf.org/html/rfc5987#section-3.2.1
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# We avoid the quoted-string version of `filename`, because (a) synapse didn't
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# correctly interpret those as of 0.99.2 and (b) they are a bit of a pain and we
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# may as well just do the filename* version.
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if _can_encode_filename_as_token(upload_name):
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disposition = "%s; filename=%s" % (
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disposition,
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upload_name,
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)
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else:
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disposition = "%s; filename*=utf-8''%s" % (
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disposition,
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_quote(upload_name),
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)
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request.setHeader(b"Content-Disposition", disposition.encode("ascii"))
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# cache for at least a day.
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# XXX: we might want to turn this off for data we don't want to
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# recommend caching as it's sensitive or private - or at least
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# select private. don't bother setting Expires as all our
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# clients are smart enough to be happy with Cache-Control
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request.setHeader(b"Cache-Control", b"public,max-age=86400,s-maxage=86400")
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if file_size is not None:
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request.setHeader(b"Content-Length", b"%d" % (file_size,))
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# Tell web crawlers to not index, archive, or follow links in media. This
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# should help to prevent things in the media repo from showing up in web
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# search results.
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request.setHeader(b"X-Robots-Tag", "noindex, nofollow, noarchive, noimageindex")
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# separators as defined in RFC2616. SP and HT are handled separately.
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# see _can_encode_filename_as_token.
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_FILENAME_SEPARATOR_CHARS = {
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"(",
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")",
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"<",
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">",
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"@",
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",",
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";",
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":",
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"\\",
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'"',
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"/",
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"[",
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"]",
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"?",
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"=",
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"{",
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"}",
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}
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def _can_encode_filename_as_token(x: str) -> bool:
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for c in x:
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# from RFC2616:
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#
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# token = 1*<any CHAR except CTLs or separators>
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#
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# separators = "(" | ")" | "<" | ">" | "@"
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# | "," | ";" | ":" | "\" | <">
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# | "/" | "[" | "]" | "?" | "="
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# | "{" | "}" | SP | HT
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#
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# CHAR = <any US-ASCII character (octets 0 - 127)>
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#
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# CTL = <any US-ASCII control character
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# (octets 0 - 31) and DEL (127)>
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#
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if ord(c) >= 127 or ord(c) <= 32 or c in _FILENAME_SEPARATOR_CHARS:
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return False
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return True
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async def respond_with_responder(
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request: SynapseRequest,
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responder: "Optional[Responder]",
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media_type: str,
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file_size: Optional[int],
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upload_name: Optional[str] = None,
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) -> None:
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"""Responds to the request with given responder. If responder is None then
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returns 404.
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Args:
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request
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responder
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media_type: The media/content type.
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file_size: Size in bytes of the media. If not known it should be None
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upload_name: The name of the requested file, if any.
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"""
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if not responder:
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respond_404(request)
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return
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# If we have a responder we *must* use it as a context manager.
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with responder:
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if request._disconnected:
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logger.warning(
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"Not sending response to request %s, already disconnected.", request
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)
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return
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logger.debug("Responding to media request with responder %s", responder)
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add_file_headers(request, media_type, file_size, upload_name)
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try:
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await responder.write_to_consumer(request)
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except Exception as e:
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# The majority of the time this will be due to the client having gone
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# away. Unfortunately, Twisted simply throws a generic exception at us
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# in that case.
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logger.warning("Failed to write to consumer: %s %s", type(e), e)
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# Unregister the producer, if it has one, so Twisted doesn't complain
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if request.producer:
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request.unregisterProducer()
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finish_request(request)
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class Responder(ABC):
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"""Represents a response that can be streamed to the requester.
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Responder is a context manager which *must* be used, so that any resources
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held can be cleaned up.
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"""
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@abstractmethod
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def write_to_consumer(self, consumer: IConsumer) -> Awaitable:
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"""Stream response into consumer
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Args:
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consumer: The consumer to stream into.
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Returns:
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Resolves once the response has finished being written
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"""
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raise NotImplementedError()
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def __enter__(self) -> None: # noqa: B027
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pass
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def __exit__( # noqa: B027
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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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pass
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class ThumbnailInfo:
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"""Details about a generated thumbnail."""
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width: int
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height: int
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method: str
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# Content type of thumbnail, e.g. image/png
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type: str
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# The size of the media file, in bytes.
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length: int
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class FileInfo:
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"""Details about a requested/uploaded file."""
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# The server name where the media originated from, or None if local.
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server_name: Optional[str]
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# The local ID of the file. For local files this is the same as the media_id
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file_id: str
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# If the file is for the url preview cache
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url_cache: bool = False
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# Whether the file is a thumbnail or not.
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thumbnail: Optional[ThumbnailInfo] = None
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# The below properties exist to maintain compatibility with third-party modules.
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@property
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def thumbnail_width(self) -> Optional[int]:
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if not self.thumbnail:
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return None
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return self.thumbnail.width
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@property
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def thumbnail_height(self) -> Optional[int]:
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if not self.thumbnail:
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return None
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return self.thumbnail.height
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@property
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def thumbnail_method(self) -> Optional[str]:
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if not self.thumbnail:
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return None
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return self.thumbnail.method
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@property
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def thumbnail_type(self) -> Optional[str]:
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if not self.thumbnail:
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return None
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return self.thumbnail.type
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@property
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def thumbnail_length(self) -> Optional[int]:
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if not self.thumbnail:
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return None
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return self.thumbnail.length
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def get_filename_from_headers(headers: Dict[bytes, List[bytes]]) -> Optional[str]:
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"""
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Get the filename of the downloaded file by inspecting the
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Content-Disposition HTTP header.
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Args:
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headers: The HTTP request headers.
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Returns:
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The filename, or None.
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"""
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content_disposition = headers.get(b"Content-Disposition", [b""])
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# No header, bail out.
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if not content_disposition[0]:
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return None
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_, params = _parse_header(content_disposition[0])
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upload_name = None
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# First check if there is a valid UTF-8 filename
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upload_name_utf8 = params.get(b"filename*", None)
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if upload_name_utf8:
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if upload_name_utf8.lower().startswith(b"utf-8''"):
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upload_name_utf8 = upload_name_utf8[7:]
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# We have a filename*= section. This MUST be ASCII, and any UTF-8
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# bytes are %-quoted.
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try:
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# Once it is decoded, we can then unquote the %-encoded
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# parts strictly into a unicode string.
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upload_name = urllib.parse.unquote(
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upload_name_utf8.decode("ascii"), errors="strict"
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)
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except UnicodeDecodeError:
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# Incorrect UTF-8.
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pass
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# If there isn't check for an ascii name.
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if not upload_name:
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upload_name_ascii = params.get(b"filename", None)
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if upload_name_ascii and is_ascii(upload_name_ascii):
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upload_name = upload_name_ascii.decode("ascii")
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# This may be None here, indicating we did not find a matching name.
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return upload_name
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def _parse_header(line: bytes) -> Tuple[bytes, Dict[bytes, bytes]]:
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"""Parse a Content-type like header.
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Cargo-culted from `cgi`, but works on bytes rather than strings.
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Args:
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line: header to be parsed
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Returns:
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The main content-type, followed by the parameter dictionary
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"""
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parts = _parseparam(b";" + line)
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key = next(parts)
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pdict = {}
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for p in parts:
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i = p.find(b"=")
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if i >= 0:
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name = p[:i].strip().lower()
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value = p[i + 1 :].strip()
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# strip double-quotes
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if len(value) >= 2 and value[0:1] == value[-1:] == b'"':
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value = value[1:-1]
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value = value.replace(b"\\\\", b"\\").replace(b'\\"', b'"')
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pdict[name] = value
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return key, pdict
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def _parseparam(s: bytes) -> Generator[bytes, None, None]:
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"""Generator which splits the input on ;, respecting double-quoted sequences
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Cargo-culted from `cgi`, but works on bytes rather than strings.
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Args:
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s: header to be parsed
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Returns:
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The split input
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"""
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while s[:1] == b";":
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s = s[1:]
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# look for the next ;
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end = s.find(b";")
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# if there is an odd number of " marks between here and the next ;, skip to the
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# next ; instead
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while end > 0 and (s.count(b'"', 0, end) - s.count(b'\\"', 0, end)) % 2:
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end = s.find(b";", end + 1)
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if end < 0:
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end = len(s)
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f = s[:end]
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yield f.strip()
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s = s[end:]
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