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Diffstat (limited to 'synapse/media/v0/content_repository.py')
| -rw-r--r-- | synapse/media/v0/content_repository.py | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/synapse/media/v0/content_repository.py b/synapse/media/v0/content_repository.py new file mode 100644 index 0000000000..64ecb5346e --- /dev/null +++ b/synapse/media/v0/content_repository.py @@ -0,0 +1,212 @@ +# -*- coding: utf-8 -*- +# Copyright 2014 OpenMarket Ltd +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +from .server import respond_with_json_bytes + +from synapse.util.stringutils import random_string +from synapse.api.errors import ( + cs_exception, SynapseError, CodeMessageException, Codes, cs_error +) + +from twisted.protocols.basic import FileSender +from twisted.web import server, resource +from twisted.internet import defer + +import base64 +import json +import logging +import os +import re + +logger = logging.getLogger(__name__) + + +class ContentRepoResource(resource.Resource): + """Provides file uploading and downloading. + + Uploads are POSTed to wherever this Resource is linked to. This resource + returns a "content token" which can be used to GET this content again. The + token is typically a path, but it may not be. Tokens can expire, be + one-time uses, etc. + + In this case, the token is a path to the file and contains 3 interesting + sections: + - User ID base64d (for namespacing content to each user) + - random 24 char string + - Content type base64d (so we can return it when clients GET it) + + """ + isLeaf = True + + def __init__(self, hs, directory, auth, external_addr): + resource.Resource.__init__(self) + self.hs = hs + self.directory = directory + self.auth = auth + self.external_addr = external_addr.rstrip('/') + self.max_upload_size = hs.config.max_upload_size + + if not os.path.isdir(self.directory): + os.mkdir(self.directory) + logger.info("ContentRepoResource : Created %s directory.", + self.directory) + + @defer.inlineCallbacks + def map_request_to_name(self, request): + # auth the user + auth_user = yield self.auth.get_user_by_req(request) + + # namespace all file uploads on the user + prefix = base64.urlsafe_b64encode( + auth_user.to_string() + ).replace('=', '') + + # use a random string for the main portion + main_part = random_string(24) + + # suffix with a file extension if we can make one. This is nice to + # provide a hint to clients on the file information. We will also reuse + # this info to spit back the content type to the client. + suffix = "" + if request.requestHeaders.hasHeader("Content-Type"): + content_type = request.requestHeaders.getRawHeaders( + "Content-Type")[0] + suffix = "." + base64.urlsafe_b64encode(content_type) + if (content_type.split("/")[0].lower() in + ["image", "video", "audio"]): + file_ext = content_type.split("/")[-1] + # be a little paranoid and only allow a-z + file_ext = re.sub("[^a-z]", "", file_ext) + suffix += "." + file_ext + + file_name = prefix + main_part + suffix + file_path = os.path.join(self.directory, file_name) + logger.info("User %s is uploading a file to path %s", + auth_user.to_string(), + file_path) + + # keep trying to make a non-clashing file, with a sensible max attempts + attempts = 0 + while os.path.exists(file_path): + main_part = random_string(24) + file_name = prefix + main_part + suffix + file_path = os.path.join(self.directory, file_name) + attempts += 1 + if attempts > 25: # really? Really? + raise SynapseError(500, "Unable to create file.") + + defer.returnValue(file_path) + + def render_GET(self, request): + # no auth here on purpose, to allow anyone to view, even across home + # servers. + + # TODO: A little crude here, we could do this better. + filename = request.path.split('/')[-1] + # be paranoid + filename = re.sub("[^0-9A-z.-_]", "", filename) + + file_path = self.directory + "/" + filename + + logger.debug("Searching for %s", file_path) + + if os.path.isfile(file_path): + # filename has the content type + base64_contentype = filename.split(".")[1] + content_type = base64.urlsafe_b64decode(base64_contentype) + logger.info("Sending file %s", file_path) + f = open(file_path, 'rb') + request.setHeader('Content-Type', content_type) + + # 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 matrix + # clients are smart enough to be happy with Cache-Control (right?) + request.setHeader( + "Cache-Control", "public,max-age=86400,s-maxage=86400" + ) + + d = FileSender().beginFileTransfer(f, request) + + # after the file has been sent, clean up and finish the request + def cbFinished(ignored): + f.close() + request.finish() + d.addCallback(cbFinished) + else: + respond_with_json_bytes( + request, + 404, + json.dumps(cs_error("Not found", code=Codes.NOT_FOUND)), + send_cors=True) + + return server.NOT_DONE_YET + + def render_POST(self, request): + self._async_render(request) + return server.NOT_DONE_YET + + def render_OPTIONS(self, request): + respond_with_json_bytes(request, 200, {}, send_cors=True) + return server.NOT_DONE_YET + + @defer.inlineCallbacks + def _async_render(self, request): + try: + # TODO: The checks here are a bit late. The content will have + # already been uploaded to a tmp file at this point + content_length = request.getHeader("Content-Length") + if content_length is None: + raise SynapseError( + msg="Request must specify a Content-Length", code=400 + ) + if int(content_length) > self.max_upload_size: + raise SynapseError( + msg="Upload request body is too large", + code=413, + ) + + fname = yield self.map_request_to_name(request) + + # TODO I have a suspicious feeling this is just going to block + with open(fname, "wb") as f: + f.write(request.content.read()) + + # FIXME (erikj): These should use constants. + file_name = os.path.basename(fname) + # FIXME: we can't assume what the repo's public mounted path is + # ...plus self-signed SSL won't work to remote clients anyway + # ...and we can't assume that it's SSL anyway, as we might want to + # serve it via the non-SSL listener... + url = "%s/_matrix/content/%s" % ( + self.external_addr, file_name + ) + + respond_with_json_bytes(request, 200, + json.dumps({"content_token": url}), + send_cors=True) + + except CodeMessageException as e: + logger.exception(e) + respond_with_json_bytes(request, e.code, + json.dumps(cs_exception(e))) + except Exception as e: + logger.error("Failed to store file: %s" % e) + respond_with_json_bytes( + request, + 500, + json.dumps({"error": "Internal server error"}), + send_cors=True) |