Fixed #7177 -- Added extra robustness to the escapejs filter so that all

invalid characters are correctly escaped. This avoids any chance to inject raw
HTML inside <script> tags. Thanks to Mike Wiacek for the patch and Collin Grady
for the tests.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8577 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/defaultfilters.py

@@ -62,20 +62,24 @@ def capfirst(value):
 capfirst.is_safe=True
 capfirst = stringfilter(capfirst)
 
-_js_escapes = (
+_base_js_escapes = (
-    ('\\', '\\\\'),
+    ('\\', r'\x5C'),
-    ('"', '\\"'),
+    ('\'', r'\x27'),
-    ("'", "\\'"),
+    ('"', r'\x22'),
-    ('\n', '\\n'),
+    ('>', r'\x3E'),
-    ('\r', '\\r'),
+    ('<', r'\x3C'),
-    ('\b', '\\b'),
+    ('&', r'\x26'),
-    ('\f', '\\f'),
+    ('=', r'\x3D'),
-    ('\t', '\\t'),
+    ('-', r'\x2D'),
-    ('\v', '\\v'),
+    (';', r'\x3B')
-    ('</', '<\\/'),
 )
+
+# Escape every ASCII character with a value less than 32.
+_js_escapes = (_base_js_escapes +
+               tuple([('%c' % z, '\\x%02X' % z) for z in range(32)]))
+
 def escapejs(value):
-    """Backslash-escapes characters for use in JavaScript strings."""
+    """Hex encodes characters for use in JavaScript strings."""
     for bad, good in _js_escapes:
         value = value.replace(bad, good)
     return value

tests/regressiontests/templates/filters.py

@@ -262,5 +262,8 @@ def get_filter_tests():
         'autoescape-stringfilter02': (r'{% autoescape off %}{{ unsafe|capfirst }}{% endautoescape %}', {'unsafe': UnsafeClass()}, 'You & me'),
         'autoescape-stringfilter03': (r'{{ safe|capfirst }}', {'safe': SafeClass()}, 'You > me'),
         'autoescape-stringfilter04': (r'{% autoescape off %}{{ safe|capfirst }}{% endautoescape %}', {'safe': SafeClass()}, 'You > me'),
+
+        'escapejs01': (r'{{ a|escapejs }}', {'a': 'testing\r\njavascript \'string" <b>escaping</b>'}, 'testing\\x0D\\x0Ajavascript \\x27string\\x22 \\x3Cb\\x3Eescaping\\x3C/b\\x3E'),
+        'escapejs02': (r'{% autoescape off %}{{ a|escapejs }}{% endautoescape %}', {'a': 'testing\r\njavascript \'string" <b>escaping</b>'}, 'testing\\x0D\\x0Ajavascript \\x27string\\x22 \\x3Cb\\x3Eescaping\\x3C/b\\x3E'),
     }