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[3.9] bpo-43882 Remove the newline, and tab early. From query and fragments. #25853

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May 3, 2021
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[3.9] bpo-43882 Remove the newline, and tab early. From query and fragments. #25853

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7a44060
Remove the newline, and tab early. From query and fragments.
orsenthil May 3, 2021
f184bef
Address Review Comments.
orsenthil May 3, 2021
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24 changes: 16 additions & 8 deletions Lib/test/test_urlparse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -614,32 +614,40 @@ def test_urlsplit_attributes(self):

def test_urlsplit_remove_unsafe_bytes(self):
# Remove ASCII tabs and newlines from input
url = "http://www.python.org/java\nscript:\talert('msg\r\n')/#frag"
url = "http\t://www.python.org/java\nscript:\talert('msg\r\n')/?query\n=\tsomething#frag\nment"
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i suggest also adding a \r in the middle of the netloc for good measure. www.python\r.org perhaps?

p = urllib.parse.urlsplit(url)
self.assertEqual(p.scheme, "http")
self.assertEqual(p.netloc, "www.python.org")
self.assertEqual(p.path, "/javascript:alert('msg')/")
self.assertEqual(p.query, "")
self.assertEqual(p.fragment, "frag")
self.assertEqual(p.query, "query=something")
self.assertEqual(p.fragment, "fragment")
self.assertEqual(p.username, None)
self.assertEqual(p.password, None)
self.assertEqual(p.hostname, "www.python.org")
self.assertEqual(p.port, None)
self.assertEqual(p.geturl(), "http://www.python.org/javascript:alert('msg')/#frag")
self.assertEqual(p.geturl(), "http://www.python.org/javascript:alert('msg')/?query=something#fragment")

# Remove ASCII tabs and newlines from input as bytes.
url = b"http://www.python.org/java\nscript:\talert('msg\r\n')/#frag"
url = b"http\t://www.python.org/java\nscript:\talert('msg\r\n')/?query\n=\tsomething#frag\nment"
p = urllib.parse.urlsplit(url)
self.assertEqual(p.scheme, b"http")
self.assertEqual(p.netloc, b"www.python.org")
self.assertEqual(p.path, b"/javascript:alert('msg')/")
self.assertEqual(p.query, b"")
self.assertEqual(p.fragment, b"frag")
self.assertEqual(p.query, b"query=something")
self.assertEqual(p.fragment, b"fragment")
self.assertEqual(p.username, None)
self.assertEqual(p.password, None)
self.assertEqual(p.hostname, b"www.python.org")
self.assertEqual(p.port, None)
self.assertEqual(p.geturl(), b"http://www.python.org/javascript:alert('msg')/#frag")
self.assertEqual(p.geturl(), b"http://www.python.org/javascript:alert('msg')/?query=something#fragment")

# with scheme as cache-key
url = "http://www.python.org/java\nscript:\talert('msg\r\n')/?query\n=\tsomething#frag\nment"
scheme = "ht\ntp"
for _ in range(2):
p = urllib.parse.urlsplit(url)
self.assertEqual(p.scheme, "http")
self.assertEqual(p.geturl(), "http://www.python.org/javascript:alert('msg')/?query=something#fragment")

def test_attributes_bad_port(self):
"""Check handling of invalid ports."""
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8 changes: 5 additions & 3 deletions Lib/urllib/parse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -456,6 +456,11 @@ def urlsplit(url, scheme='', allow_fragments=True):
"""

url, scheme, _coerce_result = _coerce_args(url, scheme)

for b in _UNSAFE_URL_BYTES_TO_REMOVE:
url = url.replace(b, "")
scheme = scheme.replace(b, "")
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According to the typeshed, the scheme argument to urlparse is Optional. However, with this change, a value of None will result in an error like:

AttributeError: 'NoneType' object has no attribute 'replace'

I'm not sure whether the typeshed is wrong or if this line should be guarded with if scheme is not None, but we should definitely fix one or the other and perhaps improve the documentation on this option.

Thanks to @branchvincent for doing the digging and reporting this issue to me.


allow_fragments = bool(allow_fragments)
key = url, scheme, allow_fragments, type(url), type(scheme)
cached = _parse_cache.get(key, None)
Expand All @@ -472,9 +477,6 @@ def urlsplit(url, scheme='', allow_fragments=True):
else:
scheme, url = url[:i].lower(), url[i+1:]

for b in _UNSAFE_URL_BYTES_TO_REMOVE:
url = url.replace(b, "")

if url[:2] == '//':
netloc, url = _splitnetloc(url, 2)
if (('[' in netloc and ']' not in netloc) or
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