updates

Backend/venv/lib/python3.12/site-packages/authlib/jose/util.py

@@ -0,0 +1,46 @@
+import binascii
+
+from authlib.common.encoding import json_loads
+from authlib.common.encoding import to_unicode
+from authlib.common.encoding import urlsafe_b64decode
+from authlib.jose.errors import DecodeError
+
+
+def extract_header(header_segment, error_cls):
+    if len(header_segment) > 256000:
+        raise ValueError("Value of header is too long")
+
+    header_data = extract_segment(header_segment, error_cls, "header")
+
+    try:
+        header = json_loads(header_data.decode("utf-8"))
+    except ValueError as e:
+        raise error_cls(f"Invalid header string: {e}") from e
+
+    if not isinstance(header, dict):
+        raise error_cls("Header must be a json object")
+    return header
+
+
+def extract_segment(segment, error_cls, name="payload"):
+    if len(segment) > 256000:
+        raise ValueError(f"Value of {name} is too long")
+
+    try:
+        return urlsafe_b64decode(segment)
+    except (TypeError, binascii.Error) as exc:
+        msg = f"Invalid {name} padding"
+        raise error_cls(msg) from exc
+
+
+def ensure_dict(s, structure_name):
+    if not isinstance(s, dict):
+        try:
+            s = json_loads(to_unicode(s))
+        except (ValueError, TypeError) as exc:
+            raise DecodeError(f"Invalid {structure_name}") from exc
+
+    if not isinstance(s, dict):
+        raise DecodeError(f"Invalid {structure_name}")
+
+    return s