213 lines
7.9 KiB
Python
213 lines
7.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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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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from synapse.http.server import respond_with_json_bytes
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from synapse.util.stringutils import random_string
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from synapse.api.errors import (
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cs_exception, SynapseError, CodeMessageException, Codes, cs_error
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)
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from twisted.protocols.basic import FileSender
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from twisted.web import server, resource
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from twisted.internet import defer
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import base64
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import simplejson as json
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import logging
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import os
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import re
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logger = logging.getLogger(__name__)
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class ContentRepoResource(resource.Resource):
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"""Provides file uploading and downloading.
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Uploads are POSTed to wherever this Resource is linked to. This resource
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returns a "content token" which can be used to GET this content again. The
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token is typically a path, but it may not be. Tokens can expire, be
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one-time uses, etc.
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In this case, the token is a path to the file and contains 3 interesting
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sections:
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- User ID base64d (for namespacing content to each user)
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- random 24 char string
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- Content type base64d (so we can return it when clients GET it)
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"""
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isLeaf = True
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def __init__(self, hs, directory, auth, external_addr):
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resource.Resource.__init__(self)
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self.hs = hs
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self.directory = directory
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self.auth = auth
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self.external_addr = external_addr.rstrip('/')
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self.max_upload_size = hs.config.max_upload_size
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if not os.path.isdir(self.directory):
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os.mkdir(self.directory)
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logger.info("ContentRepoResource : Created %s directory.",
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self.directory)
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@defer.inlineCallbacks
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def map_request_to_name(self, request):
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# auth the user
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requester = yield self.auth.get_user_by_req(request)
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# namespace all file uploads on the user
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prefix = base64.urlsafe_b64encode(
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requester.user.to_string()
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).replace('=', '')
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# use a random string for the main portion
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main_part = random_string(24)
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# suffix with a file extension if we can make one. This is nice to
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# provide a hint to clients on the file information. We will also reuse
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# this info to spit back the content type to the client.
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suffix = ""
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if request.requestHeaders.hasHeader("Content-Type"):
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content_type = request.requestHeaders.getRawHeaders(
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"Content-Type")[0]
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suffix = "." + base64.urlsafe_b64encode(content_type)
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if (content_type.split("/")[0].lower() in
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["image", "video", "audio"]):
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file_ext = content_type.split("/")[-1]
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# be a little paranoid and only allow a-z
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file_ext = re.sub("[^a-z]", "", file_ext)
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suffix += "." + file_ext
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file_name = prefix + main_part + suffix
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file_path = os.path.join(self.directory, file_name)
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logger.info("User %s is uploading a file to path %s",
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request.user.user_id.to_string(),
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file_path)
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# keep trying to make a non-clashing file, with a sensible max attempts
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attempts = 0
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while os.path.exists(file_path):
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main_part = random_string(24)
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file_name = prefix + main_part + suffix
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file_path = os.path.join(self.directory, file_name)
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attempts += 1
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if attempts > 25: # really? Really?
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raise SynapseError(500, "Unable to create file.")
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defer.returnValue(file_path)
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def render_GET(self, request):
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# no auth here on purpose, to allow anyone to view, even across home
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# servers.
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# TODO: A little crude here, we could do this better.
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filename = request.path.split('/')[-1]
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# be paranoid
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filename = re.sub("[^0-9A-z.-_]", "", filename)
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file_path = self.directory + "/" + filename
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logger.debug("Searching for %s", file_path)
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if os.path.isfile(file_path):
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# filename has the content type
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base64_contentype = filename.split(".")[1]
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content_type = base64.urlsafe_b64decode(base64_contentype)
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logger.info("Sending file %s", file_path)
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f = open(file_path, 'rb')
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request.setHeader('Content-Type', content_type)
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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 matrix
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# clients are smart enough to be happy with Cache-Control (right?)
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request.setHeader(
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"Cache-Control", "public,max-age=86400,s-maxage=86400"
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)
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d = FileSender().beginFileTransfer(f, request)
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# after the file has been sent, clean up and finish the request
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def cbFinished(ignored):
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f.close()
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request.finish()
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d.addCallback(cbFinished)
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else:
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respond_with_json_bytes(
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request,
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404,
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json.dumps(cs_error("Not found", code=Codes.NOT_FOUND)),
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send_cors=True)
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return server.NOT_DONE_YET
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def render_POST(self, request):
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self._async_render(request)
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return server.NOT_DONE_YET
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def render_OPTIONS(self, request):
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respond_with_json_bytes(request, 200, {}, send_cors=True)
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return server.NOT_DONE_YET
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@defer.inlineCallbacks
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def _async_render(self, request):
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try:
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# TODO: The checks here are a bit late. The content will have
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# already been uploaded to a tmp file at this point
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content_length = request.getHeader("Content-Length")
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if content_length is None:
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raise SynapseError(
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msg="Request must specify a Content-Length", code=400
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)
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if int(content_length) > self.max_upload_size:
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raise SynapseError(
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msg="Upload request body is too large",
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code=413,
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)
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fname = yield self.map_request_to_name(request)
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# TODO I have a suspicious feeling this is just going to block
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with open(fname, "wb") as f:
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f.write(request.content.read())
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# FIXME (erikj): These should use constants.
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file_name = os.path.basename(fname)
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# FIXME: we can't assume what the repo's public mounted path is
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# ...plus self-signed SSL won't work to remote clients anyway
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# ...and we can't assume that it's SSL anyway, as we might want to
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# serve it via the non-SSL listener...
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url = "%s/_matrix/content/%s" % (
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self.external_addr, file_name
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)
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respond_with_json_bytes(request, 200,
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json.dumps({"content_token": url}),
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send_cors=True)
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except CodeMessageException as e:
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logger.exception(e)
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respond_with_json_bytes(request, e.code,
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json.dumps(cs_exception(e)))
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except Exception as e:
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logger.error("Failed to store file: %s" % e)
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respond_with_json_bytes(
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request,
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500,
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json.dumps({"error": "Internal server error"}),
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send_cors=True)
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