Adding escapejs filter for Jinja templates

scripts/master/master_utils.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import collections
 import os
 import random
 import re
 import sys
 
@@ skipping 234 matching lines @@
     if not '@' in result:
       log.msg('Invalid blame email address "%s"' % result)
       return None
     if self.permitted_domains:
       for p in self.permitted_domains:
         if result.endswith(p):
           return result
       return None
     return result
 
+# Based on django.utils.html.escapejs from the Django project
+def EscapeJs(t):
+  """Replaces javascript special characters in the supplied string.
+
+  Characters are replaced with a textual representation of their integer
+  ordinal."""
+  js_escapes = {
+    '\\': '\\u005C',
+    '\'': '\\u0027',
+    '"': '\\u0022',
+    '>': '\\u003E',
+    '<': '\\u003C',
+    '&': '\\u0026',
+    '=': '\\u003D',
+    '-': '\\u002D',
+    ';': '\\u003B',
+    u'\u2028': '\\u2028',
+    u'\u2029': '\\u2029',
+  }
+  for k, v in js_escapes.items():
+    t = t.replace(k, v)
+  return t
 
 def CreateWebStatus(port, templates=None, tagComparator=None,
                     customEndpoints=None, console_repo_filter=None,
                     console_builder_filter=None, web_template_globals=None,
                     **kwargs):
   webstatus = WebStatus(port, **kwargs)
+  webstatus.templates.filters.update({"escapejs": EscapeJs})
   if templates:
     # Manipulate the search path for jinja templates
     # pylint: disable=F0401
     import jinja2
     # pylint: disable=E1101
     old_loaders = webstatus.templates.loader.loaders
     # pylint: disable=E1101
     new_loaders = old_loaders[:1]
     new_loaders.extend([jinja2.FileSystemLoader(x) for x in templates])
     new_loaders.extend(old_loaders[1:])
@@ skipping 446 matching lines @@
     return result
 
 
 def SetMasterProcessName():
   """Sets the name of this process to the name of the master.  Linux only."""
 
   if sys.platform != 'linux2':
     return
 
   command_line.set_command_line("master: %s" % GetMastername())