From 985ac016373403e8ad41f8d563c4355ffa8d49ff Mon Sep 17 00:00:00 2001
From: Senthil Kumaran <senthil@uthcode.com>
Date: Wed, 5 May 2021 15:50:05 -0700
Subject: [PATCH] bpo-43882 Remove the newline, and tab early. From query and
 fragments. (GH-25921)

---
 Lib/test/test_urlparse.py | 24 ++++++++++++++++--------
 Lib/urllib/parse.py       |  8 +++++---
 2 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/Lib/test/test_urlparse.py b/Lib/test/test_urlparse.py
index 67341fecef9..31943f357f4 100644
--- a/Lib/test/test_urlparse.py
+++ b/Lib/test/test_urlparse.py
@@ -614,32 +614,40 @@ class UrlParseTestCase(unittest.TestCase):
 
     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\n.org\t/java\nscript:\talert('msg\r\n')/?query\n=\tsomething#frag\nment"
         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\n.org\t/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, scheme=scheme)
+            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."""
diff --git a/Lib/urllib/parse.py b/Lib/urllib/parse.py
index 4249163f0ed..b35997bc00c 100644
--- a/Lib/urllib/parse.py
+++ b/Lib/urllib/parse.py
@@ -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, "")
+
     allow_fragments = bool(allow_fragments)
     key = url, scheme, allow_fragments, type(url), type(scheme)
     cached = _parse_cache.get(key, None)
@@ -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