diff --git a/synapse/http/client.py b/synapse/http/client.py
index cbd45b2bbe..442b4bb73d 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -15,17 +15,22 @@
from OpenSSL import SSL
from OpenSSL.SSL import VERIFY_NONE
-from synapse.api.errors import CodeMessageException
+from synapse.api.errors import (
+ CodeMessageException, SynapseError, Codes,
+)
from synapse.util.logcontext import preserve_context_over_fn
import synapse.metrics
from canonicaljson import encode_canonical_json
-from twisted.internet import defer, reactor, ssl
+from twisted.internet import defer, reactor, ssl, protocol
from twisted.web.client import (
- Agent, readBody, FileBodyProducer, PartialDownloadError,
+ BrowserLikeRedirectAgent, ContentDecoderAgent, GzipDecoder, Agent,
+ readBody, FileBodyProducer, PartialDownloadError,
)
+from twisted.web.http import PotentialDataLoss
from twisted.web.http_headers import Headers
+from twisted.web._newclient import ResponseDone
from StringIO import StringIO
@@ -238,6 +243,96 @@ class SimpleHttpClient(object):
else:
raise CodeMessageException(response.code, body)
+ # XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
+ # The two should be factored out.
+
+ @defer.inlineCallbacks
+ def get_file(self, url, output_stream, max_size=None):
+ """GETs a file from a given URL
+ Args:
+ url (str): The URL to GET
+ output_stream (file): File to write the response body to.
+ Returns:
+ A (int,dict,string,int) tuple of the file length, dict of the response
+ headers, absolute URI of the response and HTTP response code.
+ """
+
+ response = yield self.request(
+ "GET",
+ url.encode("ascii"),
+ headers=Headers({
+ b"User-Agent": [self.user_agent],
+ })
+ )
+
+ headers = dict(response.headers.getAllRawHeaders())
+
+ if 'Content-Length' in headers and headers['Content-Length'] > max_size:
+ logger.warn("Requested URL is too large > %r bytes" % (self.max_size,))
+ # XXX: do we want to explicitly drop the connection here somehow? if so, how?
+ raise # what should we be raising here?
+
+ if response.code > 299:
+ logger.warn("Got %d when downloading %s" % (response.code, url))
+ raise
+
+ # TODO: if our Content-Type is HTML or something, just read the first
+ # N bytes into RAM rather than saving it all to disk only to read it
+ # straight back in again
+
+ try:
+ length = yield preserve_context_over_fn(
+ _readBodyToFile,
+ response, output_stream, max_size
+ )
+ except:
+ logger.exception("Failed to download body")
+ raise
+
+ defer.returnValue((length, headers, response.request.absoluteURI, response.code))
+
+
+# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
+# The two should be factored out.
+
+class _ReadBodyToFileProtocol(protocol.Protocol):
+ def __init__(self, stream, deferred, max_size):
+ self.stream = stream
+ self.deferred = deferred
+ self.length = 0
+ self.max_size = max_size
+
+ def dataReceived(self, data):
+ self.stream.write(data)
+ self.length += len(data)
+ if self.max_size is not None and self.length >= self.max_size:
+ self.deferred.errback(SynapseError(
+ 502,
+ "Requested file is too large > %r bytes" % (self.max_size,),
+ Codes.TOO_LARGE,
+ ))
+ self.deferred = defer.Deferred()
+ self.transport.loseConnection()
+
+ def connectionLost(self, reason):
+ if reason.check(ResponseDone):
+ self.deferred.callback(self.length)
+ elif reason.check(PotentialDataLoss):
+ # stolen from https://github.com/twisted/treq/pull/49/files
+ # http://twistedmatrix.com/trac/ticket/4840
+ self.deferred.callback(self.length)
+ else:
+ self.deferred.errback(reason)
+
+
+# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
+# The two should be factored out.
+
+def _readBodyToFile(response, stream, max_size):
+ d = defer.Deferred()
+ response.deliverBody(_ReadBodyToFileProtocol(stream, d, max_size))
+ return d
+
class CaptchaServerHttpClient(SimpleHttpClient):
"""
@@ -269,6 +364,27 @@ class CaptchaServerHttpClient(SimpleHttpClient):
defer.returnValue(e.response)
+class SpiderHttpClient(SimpleHttpClient):
+ """
+ Separate HTTP client for spidering arbitrary URLs.
+ Special in that it follows retries and has a UA that looks
+ like a browser.
+
+ used by the preview_url endpoint in the content repo.
+ """
+ def __init__(self, hs):
+ SimpleHttpClient.__init__(self, hs)
+ # clobber the base class's agent and UA:
+ self.agent = ContentDecoderAgent(BrowserLikeRedirectAgent(Agent(
+ reactor,
+ connectTimeout=15,
+ contextFactory=hs.get_http_client_context_factory()
+ )), [('gzip', GzipDecoder)])
+ # We could look like Chrome:
+ # self.user_agent = ("Mozilla/5.0 (%s) (KHTML, like Gecko)
+ # Chrome Safari" % hs.version_string)
+
+
def encode_urlencode_args(args):
return {k: encode_urlencode_arg(v) for k, v in args.items()}
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