Source code for molten.http.query_params

# This file is a part of molten.
# Copyright (C) 2018 CLEARTYPE SRL <[email protected]>
# molten is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
# molten is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# License for more details.
# You should have received a copy of the GNU Lesser General Public License
# along with this program.  If not, see <>.

from typing import Dict, List, Optional, Union
from urllib.parse import parse_qsl

from ..common import MultiDict
from ..errors import ParamMissing
from ..typing import Environ

ParamsDict = Dict[str, Union[str, List[str]]]

[docs]class QueryParams(MultiDict[str, str]): """A mapping from param names to lists of values. Once constructed, these instances cannot be modified. """
[docs] @classmethod def from_environ(cls, environ: Environ) -> "QueryParams": """Construct a QueryParams instance from a WSGI environ. """ return cls.parse(environ.get("QUERY_STRING", ""))
[docs] @classmethod def parse(cls, query_string: str) -> "QueryParams": """Construct a QueryParams instance from a query string. """ return cls(parse_qsl(query_string))
[docs] def get(self, name: str, default: Optional[str] = None) -> Optional[str]: """Get the last value for a given key. """ try: return self[name] except ParamMissing: return default
def __getitem__(self, name: str) -> str: """Get the last value for a given key. Raises: ParamMissing: When the key is missing. """ try: return self._data[name][-1] except IndexError: raise ParamMissing(name)