From 24f36469bc5c634ff49c87e49e32579d6ac43d7c Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 5 Aug 2016 16:36:07 +0100
Subject: [PATCH] Add federation /version API

---
 synapse/app/federation_reader.py       |  2 +-
 synapse/app/homeserver.py              |  2 +-
 synapse/app/pusher.py                  |  2 +-
 synapse/app/synchrotron.py             |  2 +-
 synapse/federation/transport/server.py | 18 +++++++++++++++++-
 synapse/util/versionstring.py          |  8 ++++----
 6 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/synapse/app/federation_reader.py b/synapse/app/federation_reader.py
index 58d425f9ac..7355499ae2 100644
--- a/synapse/app/federation_reader.py
+++ b/synapse/app/federation_reader.py
@@ -165,7 +165,7 @@ def start(config_options):
         db_config=config.database_config,
         tls_server_context_factory=tls_server_context_factory,
         config=config,
-        version_string=get_version_string("Synapse", synapse),
+        version_string="Synapse/" + get_version_string(synapse),
         database_engine=database_engine,
     )
 
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index fe68ceb07c..40e6f65236 100755
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -285,7 +285,7 @@ def setup(config_options):
     # check any extra requirements we have now we have a config
     check_requirements(config)
 
-    version_string = get_version_string("Synapse", synapse)
+    version_string = "Synapse/" + get_version_string(synapse)
 
     logger.info("Server hostname: %s", config.server_name)
     logger.info("Server version: %s", version_string)
diff --git a/synapse/app/pusher.py b/synapse/app/pusher.py
index 4f1d18ab5f..c8dde0fcb8 100644
--- a/synapse/app/pusher.py
+++ b/synapse/app/pusher.py
@@ -273,7 +273,7 @@ def start(config_options):
         config.server_name,
         db_config=config.database_config,
         config=config,
-        version_string=get_version_string("Synapse", synapse),
+        version_string="Synapse/" + get_version_string(synapse),
         database_engine=database_engine,
     )
 
diff --git a/synapse/app/synchrotron.py b/synapse/app/synchrotron.py
index 8cf5bbbb6d..215ccfd522 100644
--- a/synapse/app/synchrotron.py
+++ b/synapse/app/synchrotron.py
@@ -424,7 +424,7 @@ def start(config_options):
         config.server_name,
         db_config=config.database_config,
         config=config,
-        version_string=get_version_string("Synapse", synapse),
+        version_string="Synapse/" + get_version_string(synapse),
         database_engine=database_engine,
         application_service_handler=SynchrotronApplicationService(),
     )
diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py
index ee8f94e340..37c0d4fbc4 100644
--- a/synapse/federation/transport/server.py
+++ b/synapse/federation/transport/server.py
@@ -20,11 +20,12 @@ from synapse.api.errors import Codes, SynapseError
 from synapse.http.server import JsonResource
 from synapse.http.servlet import parse_json_object_from_request
 from synapse.util.ratelimitutils import FederationRateLimiter
+from synapse.util.versionstring import get_version_string
 
 import functools
 import logging
-import simplejson as json
 import re
+import synapse
 
 
 logger = logging.getLogger(__name__)
@@ -557,6 +558,20 @@ class PublicRoomList(BaseFederationServlet):
         defer.returnValue((200, data))
 
 
+class FederationVersionServlet(BaseFederationServlet):
+    PATH = "/version"
+
+    REQUIRE_AUTH = False
+
+    def on_GET(self, origin, content, query):
+        return defer.succeed((200, {
+            "server": {
+                "name": "Synapse",
+                "version": get_version_string(synapse)
+            },
+        }))
+
+
 SERVLET_CLASSES = (
     FederationSendServlet,
     FederationPullServlet,
@@ -580,6 +595,7 @@ SERVLET_CLASSES = (
     On3pidBindServlet,
     OpenIdUserInfo,
     PublicRoomList,
+    FederationVersionServlet,
 )
 
 
diff --git a/synapse/util/versionstring.py b/synapse/util/versionstring.py
index a4f156cb3b..52086df465 100644
--- a/synapse/util/versionstring.py
+++ b/synapse/util/versionstring.py
@@ -21,7 +21,7 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-def get_version_string(name, module):
+def get_version_string(module):
     try:
         null = open(os.devnull, 'w')
         cwd = os.path.dirname(os.path.abspath(module.__file__))
@@ -74,11 +74,11 @@ def get_version_string(name, module):
             )
 
             return (
-                "%s/%s (%s)" % (
-                    name, module.__version__, git_version,
+                "%s (%s)" % (
+                    module.__version__, git_version,
                 )
             ).encode("ascii")
     except Exception as e:
         logger.info("Failed to check for git repository: %s", e)
 
-    return ("%s/%s" % (name, module.__version__,)).encode("ascii")
+    return module.__version__.encode("ascii")