| import binascii |
| from authlib.common.encoding import urlsafe_b64decode, json_loads, to_unicode |
| from authlib.jose.errors import DecodeError |
|
|
|
|
| def extract_header(header_segment, error_cls): |
| 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}') |
|
|
| if not isinstance(header, dict): |
| raise error_cls('Header must be a json object') |
| return header |
|
|
|
|
| def extract_segment(segment, error_cls, name='payload'): |
| try: |
| return urlsafe_b64decode(segment) |
| except (TypeError, binascii.Error): |
| msg = f'Invalid {name} padding' |
| raise error_cls(msg) |
|
|
|
|
| def ensure_dict(s, structure_name): |
| if not isinstance(s, dict): |
| try: |
| s = json_loads(to_unicode(s)) |
| except (ValueError, TypeError): |
| raise DecodeError(f'Invalid {structure_name}') |
|
|
| if not isinstance(s, dict): |
| raise DecodeError(f'Invalid {structure_name}') |
|
|
| return s |
|
|
