Open Source Monorail

appengine/monorail/sitewide/moved.py

Index: appengine/monorail/sitewide/moved.py
diff --git a/appengine/monorail/sitewide/moved.py b/appengine/monorail/sitewide/moved.py
new file mode 100644
index 0000000000000000000000000000000000000000..b5eef52641b7416713b0d96f26321991097fb0d6
--- /dev/null
+++ b/appengine/monorail/sitewide/moved.py
@@ -0,0 +1,57 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is govered by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+"""A class to display a message explaining that a project has moved.
+
+When a project moves, we just display a link to the new location.
+"""
+
+import logging
+
+from framework import framework_bizobj
+from framework import framework_helpers
+from framework import monorailrequest
+from framework import servlet
+
+
+class ProjectMoved(servlet.Servlet):
+  """The ProjectMoved page explains that the project has moved."""
+
+  _PAGE_TEMPLATE = 'sitewide/moved-page.ezt'
+
+  def GatherPageData(self, mr):
+    """Build up a dictionary of data values to use when rendering the page."""
+
+    # We are not actually in /p/PROJECTNAME, so mr.project_name is None.
+    # Putting the ProjectMoved page inside a moved project would make
+    # the redirect logic much more complicated.
+    if not mr.specified_project:
+      raise monorailrequest.InputException('No project specified')
+
+    project = self.services.project.GetProjectByName(
+        mr.cnxn, mr.specified_project)
+    if not project:
+      self.abort(404, 'project not found')
+
+    if not project.moved_to:
+      # Only show this page for projects that are actually moved.
+      # Don't allow hackers to construct misleading links to this servlet.
+      logging.info('attempt to view ProjectMoved for non-moved project: %s',
+                   mr.specified_project)
+      self.abort(400, 'This project has not been moved')
+
+    if framework_bizobj.RE_PROJECT_NAME.match(project.moved_to):
+      moved_to_url = framework_helpers.FormatMovedProjectURL(
+          mr, project.moved_to)
+    elif project.moved_to.startswith('http'):
+      moved_to_url = project.moved_to
+    else:
+      # Prevent users from using javascript: or any other tricky URL scheme.
+      moved_to_url = '#invalid-destination-url'
+
+    return {
+        'project_name': mr.specified_project,
+        'moved_to_url': moved_to_url,
+        }