Open Source Monorail

appengine/monorail/framework/alerts.py

+# 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
+
+"""Helpers for showing alerts at the top of the page.
+
+These alerts are then displayed by alerts.ezt.
+"""
+
+import time
+
+from third_party import ezt
+
+# Expiration time for special features of timestamped links.
+# This is not for security, just for informational messages that
+# make sense in the context of a user session, but that should
+# not appear days later if the user follows a bookmarked link.
+_LINK_EXPIRATION_SEC = 8
+
+
+class AlertsView(object):
+  """EZT object for showing alerts at the top of the page."""
+
+  def __init__(self, mr):
+    # Used to show message confirming item was updated
+    self.updated = mr.GetIntParam('updated')
+
+    # Used to show message confirming item was moved and the location of the new
+    # item.
+    self.moved_to_project = mr.GetParam('moved_to_project')
+    self.moved_to_id = mr.GetIntParam('moved_to_id')
+    self.moved = self.moved_to_project and self.moved_to_id
+
+    # Used to show message confirming item was copied and the location of the
+    # new item.
+    self.copied_from_id = mr.GetIntParam('copied_from_id')
+    self.copied_to_project = mr.GetParam('copied_to_project')
+    self.copied_to_id = mr.GetIntParam('copied_to_id')
+    self.copied = self.copied_to_project and self.copied_to_id
+
+    # Used to show message confirming items deleted
+    self.deleted = mr.GetParam('deleted')
+
+    # If present, we will show message confirming that data was saved
+    self.saved = mr.GetParam('saved')
+
+    link_generation_timestamp = mr.GetIntParam('ts', default_value=0)
+    now = int(time.time())
+    ts_links_are_valid = now - link_generation_timestamp < _LINK_EXPIRATION_SEC
+
+    show_alert = ts_links_are_valid and (
+        self.updated or self.moved or self.copied or self.deleted or self.saved)
+    self.show = ezt.boolean(show_alert)