213 lines
7.9 KiB
Python
213 lines
7.9 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014, 2015 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 synapse.http.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)
|