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from __future__ import annotations
import typing
from collections import OrderedDict
from collections.abc import Iterator, MutableMapping
from pprint import pprint # pylint: disable=unused-import
from typing import Any, Tuple, Union, cast
__all__ = ["HttpHeaderStorage"]
# pylint: disable=deprecated-typing-alias,consider-alternative-union-syntax
HttpHeaderStream = Union[
typing.Mapping[str, str],
typing.Iterable[Tuple[str, str]],
]
# pylint: enable=deprecated-typing-alias,consider-alternative-union-syntax
class HttpHeaderStorage:
"""Storage for HTTP Headers.
The storage maps string keys to one or multiple string values.
Keys are case insensitive though the original case is stored.
"""
def __init__(
self, data: None | HttpHeaderStream = None, charset: str = "utf-8"
) -> None:
self._store: MutableMapping[str, list[str]] = OrderedDict()
self._charset = charset
if data is not None:
self.extend(data)
# Public Interface
def set(self, key: str, value: str) -> None:
# Store original case of key
self._store[key.lower()] = [key, value]
def get(self, key: str) -> str:
return self._store[key.lower()][1]
def getlist(self, key: str) -> list[str]:
return self._store[key.lower()][1:]
def remove(self, key: str) -> None:
del self._store[key.lower()]
def add(self, key: str, value: str) -> None:
box = self._store.setdefault(key.lower(), [key])
box.append(value)
def extend(self, data: HttpHeaderStream) -> None:
seq = (
data.items()
if isinstance(data, MutableMapping)
# pylint: disable=deprecated-typing-alias
else cast(typing.Iterable[Tuple[str, str]], data)
# pylint: enable=deprecated-typing-alias
)
for key, val in seq:
self.add(key, val)
def __contains__(self, key: str) -> bool:
return key.lower() in self._store
def count_keys(self) -> int:
return len(self._store.keys())
def count_items(self) -> int:
return sum(1 for _ in self.items())
def items(self) -> Iterator[tuple[str, Any]]:
for items in self._store.values():
original_key = items[0]
for idx, item in enumerate(items):
if idx > 0:
yield original_key, item
def __repr__(self) -> str:
return str(list(self.items()))
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