Issue 402 - Use a redirector script for downloads, not a direct link

sitescripts/extensions/web/downloads.py

Index: sitescripts/extensions/web/downloads.py
===================================================================
new file mode 100644
--- /dev/null
+++ b/sitescripts/extensions/web/downloads.py
@@ -0,0 +1,67 @@
+# coding: utf-8
+
+# This file is part of the Adblock Plus web scripts,
+# Copyright (C) 2006-2014 Eyeo GmbH
+#
+# Adblock Plus is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# Adblock Plus 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 Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+
+import re
+import time
+import posixpath
+import urlparse
+import multiprocessing
+from ConfigParser import SafeConfigParser
+from sitescripts.web import url_handler
+from sitescripts.extensions.utils import getDownloadLinks
+
+links = {}
+
+@url_handler('/latest/')
+def handle_request(environ, start_response):
+  global links
+  update_links()
+
+  request = urlparse.urlparse(environ.get('REQUEST_URI', ''))
+  basename = posixpath.splitext(posixpath.basename(request.path))[0]
+  if basename in links:
+    start_response('302 Found', [('Location', links[basename])])
+  else:
+    start_response('404 Not Found', [])
+  return []
+
+UPDATE_INTERVAL = 10 * 60   # 10 minutes
+update_queue = multiprocessing.Queue()
+last_update = -float('Inf')
+
+def update_links():
+  global UPDATE_INTERVAL, update_queue, links, last_update
+  while not update_queue.empty():
+    links = update_queue.get()
+
+  now = time.clock()
+  if now - last_update > UPDATE_INTERVAL:
+    last_update = now
+
+    process = multiprocessing.Process(target=_update_links, args=(update_queue,))
+    process.daemon = True
+    process.start()
+
+def _update_links(queue):
+  parser = SafeConfigParser()
+  getDownloadLinks(parser)
+  result = {}
+  for section in parser.sections():
+    result[section] = parser.get(section, "downloadURL")
+  queue.put(result)
+
+update_links()