From ff93ffb858db15ec70ba57b7850cb9cb01d531c8 Mon Sep 17 00:00:00 2001
From: starlet-dx <15929766099@163.com>
Date: Tue, 15 Aug 2023 09:56:10 +0800
Subject: [PATCH 1/1] don't strip leading = when parsing cookie

Origin:
https://github.com/pallets/werkzeug/commit/8c2b4b82d0cade0d37e6a88e2cd2413878e8ebd4
---
 src/werkzeug/_internal.py | 13 +++++++++----
 tests/test_http.py        |  2 ++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/werkzeug/_internal.py b/src/werkzeug/_internal.py
index 1d2eaf5..fe69ccb 100644
--- a/src/werkzeug/_internal.py
+++ b/src/werkzeug/_internal.py
@@ -40,7 +40,7 @@ _quote_re = re.compile(br"[\\].")
 _legal_cookie_chars_re = br"[\w\d!#%&\'~_`><@,:/\$\*\+\-\.\^\|\)\(\?\}\{\=]"
 _cookie_re = re.compile(
     br"""
-    (?P<key>[^=;]+)
+    (?P<key>[^=;]*)
     (?:\s*=\s*
         (?P<val>
             "(?:[^\\"]|\\.)*" |
@@ -316,16 +316,21 @@ def _cookie_parse_impl(b):
     """Lowlevel cookie parsing facility that operates on bytes."""
     i = 0
     n = len(b)
+    b += b";"
 
     while i < n:
-        match = _cookie_re.search(b + b";", i)
+        match = _cookie_re.match(b, i)
+
         if not match:
             break
 
-        key = match.group("key").strip()
-        value = match.group("val") or b""
         i = match.end(0)
+        key = match.group("key").strip()
+
+        if not key:
+            continue
 
+        value = match.group("val") or b""
         yield _cookie_unquote(key), _cookie_unquote(value)
 
 
diff --git a/tests/test_http.py b/tests/test_http.py
index 5725170..58042c0 100644
--- a/tests/test_http.py
+++ b/tests/test_http.py
@@ -446,6 +446,7 @@ class TestHTTPUtility(object):
         cookies = http.parse_cookie(
             "dismiss-top=6; CP=null*; PHPSESSID=0a539d42abc001cdc762809248d4beed;"
             ' a=42; b="\\";"; ; fo234{=bar;blub=Blah;'
+            "==__Host-eq=bad;__Host-eq=good;"
         )
         assert cookies.to_dict() == {
             "CP": u"null*",
@@ -455,6 +456,7 @@ class TestHTTPUtility(object):
             "b": u'";',
             "fo234{": u"bar",
             "blub": u"Blah",
+            "__Host-eq": "good",
         }
 
     def test_dump_cookie(self):
-- 
2.30.0