From 678858255bb046f4dd5cbdb51ce9820ce9f651a0 Mon Sep 17 00:00:00 2001
From: Kali Kaneko <kali@leap.se>
Date: Fri, 13 Dec 2013 07:00:45 -0400
Subject: enable gzip compression

---
 server/changes/feature_enable-gzip         |  1 +
 server/src/leap/soledad/server/__init__.py |  7 ++-
 server/src/leap/soledad/server/gzip.py     | 69 ++++++++++++++++++++++++++++++
 3 files changed, 75 insertions(+), 2 deletions(-)
 create mode 100644 server/changes/feature_enable-gzip
 create mode 100644 server/src/leap/soledad/server/gzip.py

diff --git a/server/changes/feature_enable-gzip b/server/changes/feature_enable-gzip
new file mode 100644
index 00000000..5cc1597c
--- /dev/null
+++ b/server/changes/feature_enable-gzip
@@ -0,0 +1 @@
+  o Enable Gzip compression on the soledad wsgi app.
diff --git a/server/src/leap/soledad/server/__init__.py b/server/src/leap/soledad/server/__init__.py
index 9cad6093..de5daf62 100644
--- a/server/src/leap/soledad/server/__init__.py
+++ b/server/src/leap/soledad/server/__init__.py
@@ -110,6 +110,8 @@ if version.base() == "12.0.0":
     sys.modules['OpenSSL.tsafe'] = old_tsafe
 
 from leap.soledad.server.auth import SoledadTokenAuthMiddleware
+from leap.soledad.server.gzip import GzipMiddleware
+
 from leap.soledad.common import (
     SHARED_DB_NAME,
     SHARED_DB_LOCK_DOC_ID_PREFIX,
@@ -378,8 +380,9 @@ def application(environ, start_response):
         SoledadApp.SHARED_DB_NAME,
         SoledadTokenAuthMiddleware.TOKENS_DB)
     # WSGI application that may be used by `twistd -web`
-    application = SoledadTokenAuthMiddleware(SoledadApp(state))
-    resource = WSGIResource(reactor, reactor.getThreadPool(), application)
+    application = GzipMiddleware(
+        SoledadTokenAuthMiddleware(SoledadApp(state)))
+
     return application(environ, start_response)
 
 
diff --git a/server/src/leap/soledad/server/gzip.py b/server/src/leap/soledad/server/gzip.py
new file mode 100644
index 00000000..92906513
--- /dev/null
+++ b/server/src/leap/soledad/server/gzip.py
@@ -0,0 +1,69 @@
+# -*- coding: utf-8 -*-
+# gzip.py
+# Copyright (C) 2013 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Gzip middleware for WSGI apps.
+"""
+import gzip
+import StringIO
+
+
+class GzipMiddleware(object):
+    """
+    GzipMiddleware class for WSGI.
+    """
+    def __init__(self, app, compresslevel=9):
+        self.app = app
+        self.compresslevel = compresslevel
+
+    def __call__(self, environ, start_response):
+        if 'gzip' not in environ.get('HTTP_ACCEPT_ENCODING', ''):
+            return self.app(environ, start_response)
+        if (environ['PATH_INFO'][-3:] != '.js' and environ[
+                'PATH_INFO'][-4:] != '.css'):
+            return self.app(environ, start_response)
+        buffer = StringIO.StringIO()
+        output = gzip.GzipFile(
+            mode='wb',
+            compresslevel=self.compresslevel,
+            fileobj=buffer
+        )
+
+        start_response_args = []
+
+        def dummy_start_response(status, headers, exc_info=None):
+            start_response_args.append(status)
+            start_response_args.append(headers)
+            start_response_args.append(exc_info)
+            return output.write
+
+        app_iter = self.app(environ, dummy_start_response)
+        for line in app_iter:
+            output.write(line)
+        if hasattr(app_iter, 'close'):
+            app_iter.close()
+        output.close()
+        buffer.seek(0)
+        result = buffer.getvalue()
+        headers = []
+        for name, value in start_response_args[1]:
+            if name.lower() != 'content-length':
+                headers.append((name, value))
+        headers.append(('Content-Length', str(len(result))))
+        headers.append(('Content-Encoding', 'gzip'))
+        start_response(start_response_args[0], headers, start_response_args[2])
+        buffer.close()
+        return [result]
-- 
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