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gh-149144: Use decodeURIComponent() for UTF-8 support in js_output() #149157

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gh-149144: Use decodeURIComponent() for UTF-8 support in js_output() #149157

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gh-149144: Use decodeURIComponent() for UTF-8 support in js_output()
sethmlarson Apr 29, 2026
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sethmlarson Apr 29, 2026
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6 changes: 3 additions & 3 deletions Lib/http/cookies.py
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Original file line number Diff line number Diff line change
Expand Up @@ -391,18 +391,18 @@ def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self.OutputString())

def js_output(self, attrs=None):
import base64
import urllib.parse
# Print javascript
output_string = self.OutputString(attrs)
if _has_control_character(output_string):
raise CookieError("Control characters are not allowed in cookies")
# Base64-encode value to avoid template
# injection in cookie values.
output_encoded = base64.b64encode(output_string.encode('utf-8')).decode("ascii")
output_encoded = urllib.parse.quote(output_string, safe='', encoding='utf-8')
return """
<script type="text/javascript">
<!-- begin hiding
document.cookie = atob(\"%s\");
document.cookie = decodeURIComponent(\"%s\");
// end hiding -->
</script>
""" % (output_encoded,)
Expand Down
28 changes: 15 additions & 13 deletions Lib/test/test_http_cookies.py
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Original file line number Diff line number Diff line change
@@ -1,11 +1,11 @@
# Simple test suite for http/cookies.py
import base64
import copy
import unittest
import doctest
from http import cookies
import pickle
from test import support
import urllib.parse


class CookieTests(unittest.TestCase):
Expand Down Expand Up @@ -175,19 +175,20 @@ def test_load(self):

self.assertEqual(C.output(['path']),
'Set-Cookie: Customer="WILE_E_COYOTE"; Path=/acme')
cookie_encoded = base64.b64encode(b'Customer="WILE_E_COYOTE"; Path=/acme; Version=1').decode('ascii')
cookie_encoded = urllib.parse.quote('Customer="WILE_E_COYOTE"; Path=/acme; Version=1', safe='', encoding='utf-8')
self.assertNotIn('/', cookie_encoded)
self.assertEqual(C.js_output(), fr"""
<script type="text/javascript">
<!-- begin hiding
document.cookie = atob("{cookie_encoded}");
document.cookie = decodeURIComponent("{cookie_encoded}");
// end hiding -->
</script>
""")
cookie_encoded = base64.b64encode(b'Customer="WILE_E_COYOTE"; Path=/acme').decode('ascii')
cookie_encoded = urllib.parse.quote('Customer="WILE_E_COYOTE"; Path=/acme', safe='', encoding='utf-8')
self.assertEqual(C.js_output(['path']), fr"""
<script type="text/javascript">
<!-- begin hiding
document.cookie = atob("{cookie_encoded}");
document.cookie = decodeURIComponent("{cookie_encoded}");
// end hiding -->
</script>
""")
Expand Down Expand Up @@ -292,19 +293,19 @@ def test_quoted_meta(self):

self.assertEqual(C.output(['path']),
'Set-Cookie: Customer="WILE_E_COYOTE"; Path=/acme')
expected_encoded_cookie = base64.b64encode(b'Customer=\"WILE_E_COYOTE\"; Path=/acme; Version=1').decode('ascii')
expected_encoded_cookie = urllib.parse.quote('Customer=\"WILE_E_COYOTE\"; Path=/acme; Version=1', safe='', encoding='utf-8')
self.assertEqual(C.js_output(), fr"""
<script type="text/javascript">
<!-- begin hiding
document.cookie = atob("{expected_encoded_cookie}");
document.cookie = decodeURIComponent("{expected_encoded_cookie}");
// end hiding -->
</script>
""")
expected_encoded_cookie = base64.b64encode(b'Customer=\"WILE_E_COYOTE\"; Path=/acme').decode('ascii')
expected_encoded_cookie = urllib.parse.quote('Customer=\"WILE_E_COYOTE\"; Path=/acme', safe='', encoding='utf-8')
self.assertEqual(C.js_output(['path']), fr"""
<script type="text/javascript">
<!-- begin hiding
document.cookie = atob("{expected_encoded_cookie}");
document.cookie = decodeURIComponent("{expected_encoded_cookie}");
// end hiding -->
</script>
""")
Expand Down Expand Up @@ -395,13 +396,14 @@ def test_setter(self):
self.assertEqual(
M.output(),
"Set-Cookie: %s=%s; Path=/foo" % (i, "%s_coded_val" % i))
expected_encoded_cookie = base64.b64encode(
("%s=%s; Path=/foo" % (i, "%s_coded_val" % i)).encode("ascii")
).decode('ascii')
expected_encoded_cookie = urllib.parse.quote(
"%s=%s; Path=/foo" % (i, "%s_coded_val" % i),
safe='', encoding='utf-8',
)
expected_js_output = """
<script type="text/javascript">
<!-- begin hiding
document.cookie = atob("%s");
document.cookie = decodeURIComponent("%s");
// end hiding -->
</script>
""" % (expected_encoded_cookie,)
Expand Down
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