If the web client is enabled, automatically redirect root '/' to the web client path.

synapse/http/server.py

@@ -22,6 +22,7 @@ from synapse.api.errors import cs_exception, CodeMessageException
 from twisted.internet import defer, reactor
 from twisted.web import server, resource
 from twisted.web.server import NOT_DONE_YET
+from twisted.web.util import redirectTo
 
 import collections
 import logging
@@ -159,6 +160,22 @@ class JsonResource(HttpServer, resource.Resource):
         return False
 
 
+class RootRedirect(resource.Resource):
+    """Redirects the root '/' path to another path."""
+
+    def __init__(self, path):
+        resource.Resource.__init__(self)
+        self.url = path
+
+    def render_GET(self, request):
+        return redirectTo(self.url, request)
+
+    def getChild(self, name, request):
+        if len(name) == 0:
+            return self  # select ourselves as the child to render
+        return resource.Resource.getChild(self, name, request)
+
+
 def respond_with_json_bytes(request, code, json_bytes, send_cors=False):
     """Sends encoded JSON in response to the given request.