diff options
Diffstat (limited to 'synapse/rest/media/v1/_base.py')
| -rw-r--r-- | synapse/rest/media/v1/_base.py | 133 |
1 files changed, 106 insertions, 27 deletions
diff --git a/synapse/rest/media/v1/_base.py b/synapse/rest/media/v1/_base.py index 76e479afa3..d16a30acd8 100644 --- a/synapse/rest/media/v1/_base.py +++ b/synapse/rest/media/v1/_base.py @@ -16,6 +16,7 @@ import logging import os +from six import PY3 from six.moves import urllib from twisted.internet import defer @@ -48,26 +49,21 @@ def parse_media_id(request): return server_name, media_id, file_name except Exception: raise SynapseError( - 404, - "Invalid media id token %r" % (request.postpath,), - Codes.UNKNOWN, + 404, "Invalid media id token %r" % (request.postpath,), Codes.UNKNOWN ) def respond_404(request): respond_with_json( - request, 404, - cs_error( - "Not found %r" % (request.postpath,), - code=Codes.NOT_FOUND, - ), - send_cors=True + request, + 404, + cs_error("Not found %r" % (request.postpath,), code=Codes.NOT_FOUND), + send_cors=True, ) @defer.inlineCallbacks -def respond_with_file(request, media_type, file_path, - file_size=None, upload_name=None): +def respond_with_file(request, media_type, file_path, file_size=None, upload_name=None): logger.debug("Responding with %r", file_path) if os.path.isfile(file_path): @@ -97,31 +93,26 @@ def add_file_headers(request, media_type, file_size, upload_name): file_size (int): Size in bytes of the media, if known. upload_name (str): The name of the requested file, if any. """ + def _quote(x): return urllib.parse.quote(x.encode("utf-8")) request.setHeader(b"Content-Type", media_type.encode("UTF-8")) if upload_name: if is_ascii(upload_name): - disposition = ("inline; filename=%s" % (_quote(upload_name),)).encode("ascii") + disposition = "inline; filename=%s" % (_quote(upload_name),) else: - disposition = ( - "inline; filename*=utf-8''%s" % (_quote(upload_name),)).encode("ascii") + disposition = "inline; filename*=utf-8''%s" % (_quote(upload_name),) - request.setHeader(b"Content-Disposition", disposition) + request.setHeader(b"Content-Disposition", disposition.encode('ascii')) # cache for at least a day. # XXX: we might want to turn this off for data we don't want to # recommend caching as it's sensitive or private - or at least # select private. don't bother setting Expires as all our # clients are smart enough to be happy with Cache-Control - request.setHeader( - b"Cache-Control", b"public,max-age=86400,s-maxage=86400" - ) - - request.setHeader( - b"Content-Length", b"%d" % (file_size,) - ) + request.setHeader(b"Cache-Control", b"public,max-age=86400,s-maxage=86400") + request.setHeader(b"Content-Length", b"%d" % (file_size,)) @defer.inlineCallbacks @@ -142,8 +133,15 @@ def respond_with_responder(request, responder, media_type, file_size, upload_nam logger.debug("Responding to media request with responder %s") add_file_headers(request, media_type, file_size, upload_name) - with responder: - yield responder.write_to_consumer(request) + try: + with responder: + yield responder.write_to_consumer(request) + except Exception as e: + # The majority of the time this will be due to the client having gone + # away. Unfortunately, Twisted simply throws a generic exception at us + # in that case. + logger.warning("Failed to write to consumer: %s %s", type(e), e) + finish_request(request) @@ -153,6 +151,7 @@ class Responder(object): Responder is a context manager which *must* be used, so that any resources held can be cleaned up. """ + def write_to_consumer(self, consumer): """Stream response into consumer @@ -186,9 +185,18 @@ class FileInfo(object): thumbnail_method (str) thumbnail_type (str): Content type of thumbnail, e.g. image/png """ - def __init__(self, server_name, file_id, url_cache=False, - thumbnail=False, thumbnail_width=None, thumbnail_height=None, - thumbnail_method=None, thumbnail_type=None): + + def __init__( + self, + server_name, + file_id, + url_cache=False, + thumbnail=False, + thumbnail_width=None, + thumbnail_height=None, + thumbnail_method=None, + thumbnail_type=None, + ): self.server_name = server_name self.file_id = file_id self.url_cache = url_cache @@ -197,3 +205,74 @@ class FileInfo(object): self.thumbnail_height = thumbnail_height self.thumbnail_method = thumbnail_method self.thumbnail_type = thumbnail_type + + +def get_filename_from_headers(headers): + """ + Get the filename of the downloaded file by inspecting the + Content-Disposition HTTP header. + + Args: + headers (twisted.web.http_headers.Headers): The HTTP + request headers. + + Returns: + A Unicode string of the filename, or None. + """ + content_disposition = headers.get(b"Content-Disposition", [b'']) + + # No header, bail out. + if not content_disposition[0]: + return + + # dict of unicode: bytes, corresponding to the key value sections of the + # Content-Disposition header. + params = {} + parts = content_disposition[0].split(b";") + for i in parts: + # Split into key-value pairs, if able + # We don't care about things like `inline`, so throw it out + if b"=" not in i: + continue + + key, value = i.strip().split(b"=") + params[key.decode('ascii')] = value + + upload_name = None + + # First check if there is a valid UTF-8 filename + upload_name_utf8 = params.get("filename*", None) + if upload_name_utf8: + if upload_name_utf8.lower().startswith(b"utf-8''"): + upload_name_utf8 = upload_name_utf8[7:] + # We have a filename*= section. This MUST be ASCII, and any UTF-8 + # bytes are %-quoted. + if PY3: + try: + # Once it is decoded, we can then unquote the %-encoded + # parts strictly into a unicode string. + upload_name = urllib.parse.unquote( + upload_name_utf8.decode('ascii'), errors="strict" + ) + except UnicodeDecodeError: + # Incorrect UTF-8. + pass + else: + # On Python 2, we first unquote the %-encoded parts and then + # decode it strictly using UTF-8. + try: + upload_name = urllib.parse.unquote(upload_name_utf8).decode('utf8') + except UnicodeDecodeError: + pass + + # If there isn't check for an ascii name. + if not upload_name: + upload_name_ascii = params.get("filename", None) + if upload_name_ascii and is_ascii(upload_name_ascii): + # Make sure there's no %-quoted bytes. If there is, reject it as + # non-valid ASCII. + if b"%" not in upload_name_ascii: + upload_name = upload_name_ascii.decode('ascii') + + # This may be None here, indicating we did not find a matching name. + return upload_name |