Issue 2571 - Add the Adblock Browser devbuild update handler from servercontent

sitescripts/extensions/web/adblockbrowserUpdates.py

Index: sitescripts/extensions/web/adblockbrowserUpdates.py
===================================================================
new file mode 100644
--- /dev/null
+++ b/sitescripts/extensions/web/adblockbrowserUpdates.py
@@ -0,0 +1,98 @@
+# coding: utf-8
+
+# This file is part of the Adblock Plus web scripts,
+# Copyright (C) 2006-2015 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 hashlib
+import os
+import re
+from urlparse import parse_qs
+
+from jinja2 import Template
+
+from sitescripts.utils import get_config
+from sitescripts.web import url_handler
+
+_MANIFEST_TEMPLATE = Template("""<?xml version="1.0"?>
+<updates>
+{% if build %}
+    <update buildID="{{ build.build_id }}">
+        <patch
+          URL="{{ build.url }}"
+          hashFunction="{{ build.hash_function }}"
+          hashValue="{{ build.hash_value }}"
+          size="{{ build.size }}"/>
+    </update>
+{% endif %}
+</updates>
+
+""", autoescape=True)
+
+def _get_latest_build(builds_dir):
+  latest_build = {"id": 0}
+  for file in os.listdir(builds_dir):
+    match = re.search(r"^adblockbrowser-.*?(\d+)-\w+\.apk$", file)
+    if match:
+      build_id = int(match.group(1))
+      if build_id > latest_build["id"]:
+        latest_build["id"] = build_id
+        latest_build["path"] = os.path.join(builds_dir, file)
+  if latest_build["id"] == 0:
+    return {}
+  return latest_build
+
+def _render_manifest(build=None):
+  if not build:
+    return _MANIFEST_TEMPLATE.render()
+
+  nightlies_url = get_config().get("extensions", "nightliesURL")
+  build_url = "%s/adblockbrowser/%s?update" % (nightlies_url.rstrip("/"),
+                                               os.path.basename(build["path"]))
+  with open(build["path"], "rb") as build_file:
+    build_content = build_file.read()
+  return _MANIFEST_TEMPLATE.render({
+    "build": {
+      "build_id": build["id"],
+      "url": build_url,
+      "hash_function": "SHA512",
+      "hash_value": hashlib.sha512(build_content).hexdigest(),
+      "size": len(build_content)
+    }
+  })
+
+def _get_update_manifest(current_build_id):
+  nightlies_dir = get_config().get("extensions", "nightliesDirectory")
+  builds_dir = os.path.join(nightlies_dir, "adblockbrowser")
+  if not os.path.isdir(builds_dir):
+    return _render_manifest()
+
+  latest_build = _get_latest_build(builds_dir)
+  if not latest_build or current_build_id >= latest_build["id"]:
+    return _render_manifest()
+  return _render_manifest(latest_build)
+
+@url_handler("/devbuilds/adblockbrowser/updates.xml")
+def adblockbrowser_updates(environ, start_response):
+  params = parse_qs(environ.get("QUERY_STRING", ""))
+  try:
+    version = params.get("addonVersion", [""])[0]
+    build_id = int(re.search(r"(\d+)$", version).group(1))
+  except:
+    start_response("400 Processing Error", [("Content-Type", "text/plain")])
+    return ["Failed to parse addonVersion."]
+  manifest = _get_update_manifest(build_id)
+  response = manifest.encode("utf-8")
+  start_response("200 OK", [("Content-Type", "application/xml; charset=utf-8")])
+  return [response]