cherrypy update

fixes #3348

lib/cherrypy/_private_api/compat/headers.py

@@ -0,0 +1,39 @@
+"""HTTP header parsing helpers."""
+
+
+def _parse_param(s):
+    while s[:1] == ';':
+        s = s[1:]
+        end = s.find(';')
+        while end > 0 and (s.count('"', 0, end) - s.count('\\"', 0, end)) % 2:
+            end = s.find(';', end + 1)
+        if end < 0:
+            end = len(s)
+        f = s[:end]
+        yield f.strip()
+        s = s[end:]
+
+
+def parse_header(line):
+    """Parse a ``Content-Type`` like header.
+
+    Return the main ``Content-Type`` and a dictionary of options.
+
+    Copied from removed stdlib :mod:`cgi` module. See
+    `cherrypy/cherrypy#2014 (comment)
+    <https://github.com/cherrypy/cherrypy/issues/2014#issuecomment-1883774891>`_
+    for background.
+    """
+    parts = _parse_param(';' + line)
+    key = parts.__next__()
+    pdict = {}
+    for p in parts:
+        i = p.find('=')
+        if i >= 0:
+            name = p[:i].strip().lower()
+            value = p[i + 1:].strip()
+            if len(value) >= 2 and value[0] == value[-1] == '"':
+                value = value[1:-1]
+                value = value.replace('\\\\', '\\').replace('\\"', '"')
+            pdict[name] = value
+    return key, pdict