mirror of
https://github.com/enpaul/kodak.git
synced 2024-11-23 15:07:13 +00:00
111 lines
4.1 KiB
Python
111 lines
4.1 KiB
Python
"""Shared resource base with common functionality"""
|
|
import logging
|
|
from typing import Any
|
|
from typing import Dict
|
|
from typing import List
|
|
from typing import NamedTuple
|
|
from typing import Optional
|
|
from typing import Tuple
|
|
from typing import Union
|
|
|
|
import flask
|
|
import flask_restful
|
|
|
|
|
|
ResponseBody = Optional[Union[Dict[str, Any], List[Dict[str, Any]], List[str]]]
|
|
|
|
|
|
ResponseHeaders = Dict[str, str]
|
|
|
|
|
|
class ResponseTuple(NamedTuple):
|
|
"""Namedtuple representing the format of a flask-restful response tuple
|
|
|
|
:param body: Response body; must be comprised only of JSON-friendly primative types
|
|
:param code: HTTP response code
|
|
:param headers: Dictionary of headers
|
|
"""
|
|
|
|
body: ResponseBody
|
|
code: int
|
|
headers: ResponseHeaders
|
|
|
|
|
|
class FresnelResource(flask_restful.Resource):
|
|
"""Extension of the default :class:`flask_restful.Resource` class
|
|
|
|
Add a couple of useful things to the default resource class:
|
|
|
|
* Adds the :meth:`options` method to respond to HTTP OPTION requests
|
|
* Adds the :meth:`_head` method as a stub helper for responding to HTTP HEAD requests
|
|
* Adds the :meth:`make_response` method which handles response formatting boilerplate
|
|
* Type hints the :attr:`routes` attribute for usage in subclasses
|
|
* Adds an instance logger
|
|
|
|
.. warning:: This class is a stub and should not be directly attached to an application
|
|
|
|
:attribute routes: Tuple of route paths that this resource should handle; can be unpacked into
|
|
``flask_restful.Api().add_route()``
|
|
"""
|
|
|
|
routes: Tuple[str, ...]
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self.logger = logging.getLogger()
|
|
|
|
def options(
|
|
self, *args, **kwargs
|
|
) -> ResponseTuple: # pylint: disable=unused-argument
|
|
"""Implement HTTP ``OPTIONS`` support
|
|
|
|
`Reference documentation <https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS>`_
|
|
"""
|
|
|
|
verbs = ",".join([verb.upper() for verb in flask.request.url_rule.methods])
|
|
|
|
return self.make_response(None, 204, {"Allowed": verbs})
|
|
|
|
def _head(self, response: ResponseTuple) -> ResponseTuple:
|
|
"""Wrapper to implement HTTP ``HEAD`` support
|
|
|
|
`Reference documentation <https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/HEAD>`_
|
|
|
|
.. note:: The ``head`` method cannot be implemented directly as an alias of ``get`` because
|
|
that would require a uniform signature for ``get`` across all resources; or some
|
|
hacky nonsense that wouldn't be worth it. This stub instead lets child resources
|
|
implement ``head`` as a oneliner.
|
|
"""
|
|
return self.make_response(None, response.code, response.headers)
|
|
|
|
def make_response(
|
|
self,
|
|
data: ResponseBody,
|
|
code: int = 200,
|
|
headers: Optional[ResponseHeaders] = None,
|
|
):
|
|
"""Create a response tuple from the current context
|
|
|
|
Helper function for generating defaults, parsing common data, and formatting the response.
|
|
|
|
:param data: Response data to return from the request
|
|
:param code: Response code to return; defaults to `200: Ok <https://httpstatuses.com/200>`_
|
|
:param headers: Additional headers to return with the request; the default headers will
|
|
be added automatically and do not need to be passed.
|
|
:returns: Response tuple ready to be returned out of a resource method
|
|
|
|
.. note:: This function will handle pagination and header assembly internally. The response
|
|
data passed to the ``data`` parameter should be unpaginated.
|
|
"""
|
|
|
|
headers = headers or {}
|
|
headers = {**headers, **flask.request.make_response_headers()}
|
|
|
|
# 204 code specifies that it must never include a response body. Most clients will ignore
|
|
# any response body when a 204 is given, but that's no reason to abandon best practices here
|
|
# on the server side
|
|
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/204
|
|
return ResponseTuple(
|
|
body=data if code != 204 else None, code=code, headers=headers
|
|
)
|