285 lines
9.0 KiB
Python
285 lines
9.0 KiB
Python
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import asyncio
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import logging
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from django.core.exceptions import ImproperlyConfigured
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from django.http import (
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HttpResponse,
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HttpResponseGone,
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HttpResponseNotAllowed,
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HttpResponsePermanentRedirect,
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HttpResponseRedirect,
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)
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from django.template.response import TemplateResponse
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from django.urls import reverse
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from django.utils.decorators import classonlymethod
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from django.utils.functional import classproperty
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logger = logging.getLogger("django.request")
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class ContextMixin:
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"""
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A default context mixin that passes the keyword arguments received by
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get_context_data() as the template context.
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"""
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extra_context = None
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def get_context_data(self, **kwargs):
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kwargs.setdefault("view", self)
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if self.extra_context is not None:
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kwargs.update(self.extra_context)
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return kwargs
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class View:
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"""
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Intentionally simple parent class for all views. Only implements
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dispatch-by-method and simple sanity checking.
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"""
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http_method_names = [
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"get",
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"post",
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"put",
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"patch",
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"delete",
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"head",
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"options",
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"trace",
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]
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def __init__(self, **kwargs):
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"""
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Constructor. Called in the URLconf; can contain helpful extra
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keyword arguments, and other things.
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"""
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# Go through keyword arguments, and either save their values to our
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# instance, or raise an error.
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for key, value in kwargs.items():
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setattr(self, key, value)
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@classproperty
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def view_is_async(cls):
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handlers = [
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getattr(cls, method)
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for method in cls.http_method_names
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if (method != "options" and hasattr(cls, method))
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]
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if not handlers:
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return False
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is_async = asyncio.iscoroutinefunction(handlers[0])
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if not all(asyncio.iscoroutinefunction(h) == is_async for h in handlers[1:]):
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raise ImproperlyConfigured(
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f"{cls.__qualname__} HTTP handlers must either be all sync or all "
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"async."
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)
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return is_async
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@classonlymethod
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def as_view(cls, **initkwargs):
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"""Main entry point for a request-response process."""
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for key in initkwargs:
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if key in cls.http_method_names:
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raise TypeError(
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"The method name %s is not accepted as a keyword argument "
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"to %s()." % (key, cls.__name__)
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)
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if not hasattr(cls, key):
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raise TypeError(
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"%s() received an invalid keyword %r. as_view "
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"only accepts arguments that are already "
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"attributes of the class." % (cls.__name__, key)
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)
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def view(request, *args, **kwargs):
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self = cls(**initkwargs)
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self.setup(request, *args, **kwargs)
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if not hasattr(self, "request"):
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raise AttributeError(
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"%s instance has no 'request' attribute. Did you override "
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"setup() and forget to call super()?" % cls.__name__
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)
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return self.dispatch(request, *args, **kwargs)
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view.view_class = cls
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view.view_initkwargs = initkwargs
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# __name__ and __qualname__ are intentionally left unchanged as
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# view_class should be used to robustly determine the name of the view
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# instead.
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view.__doc__ = cls.__doc__
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view.__module__ = cls.__module__
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view.__annotations__ = cls.dispatch.__annotations__
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# Copy possible attributes set by decorators, e.g. @csrf_exempt, from
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# the dispatch method.
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view.__dict__.update(cls.dispatch.__dict__)
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# Mark the callback if the view class is async.
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if cls.view_is_async:
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view._is_coroutine = asyncio.coroutines._is_coroutine
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return view
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def setup(self, request, *args, **kwargs):
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"""Initialize attributes shared by all view methods."""
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if hasattr(self, "get") and not hasattr(self, "head"):
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self.head = self.get
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self.request = request
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self.args = args
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self.kwargs = kwargs
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def dispatch(self, request, *args, **kwargs):
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# Try to dispatch to the right method; if a method doesn't exist,
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# defer to the error handler. Also defer to the error handler if the
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# request method isn't on the approved list.
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if request.method.lower() in self.http_method_names:
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handler = getattr(
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self, request.method.lower(), self.http_method_not_allowed
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)
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else:
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handler = self.http_method_not_allowed
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return handler(request, *args, **kwargs)
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def http_method_not_allowed(self, request, *args, **kwargs):
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logger.warning(
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"Method Not Allowed (%s): %s",
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request.method,
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request.path,
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extra={"status_code": 405, "request": request},
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)
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response = HttpResponseNotAllowed(self._allowed_methods())
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if self.view_is_async:
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async def func():
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return response
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return func()
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else:
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return response
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def options(self, request, *args, **kwargs):
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"""Handle responding to requests for the OPTIONS HTTP verb."""
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response = HttpResponse()
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response.headers["Allow"] = ", ".join(self._allowed_methods())
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response.headers["Content-Length"] = "0"
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if self.view_is_async:
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async def func():
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return response
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return func()
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else:
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return response
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def _allowed_methods(self):
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return [m.upper() for m in self.http_method_names if hasattr(self, m)]
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class TemplateResponseMixin:
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"""A mixin that can be used to render a template."""
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template_name = None
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template_engine = None
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response_class = TemplateResponse
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content_type = None
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def render_to_response(self, context, **response_kwargs):
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"""
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Return a response, using the `response_class` for this view, with a
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template rendered with the given context.
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Pass response_kwargs to the constructor of the response class.
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"""
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response_kwargs.setdefault("content_type", self.content_type)
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return self.response_class(
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request=self.request,
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template=self.get_template_names(),
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context=context,
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using=self.template_engine,
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**response_kwargs,
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)
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def get_template_names(self):
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"""
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Return a list of template names to be used for the request. Must return
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a list. May not be called if render_to_response() is overridden.
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"""
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if self.template_name is None:
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raise ImproperlyConfigured(
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"TemplateResponseMixin requires either a definition of "
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"'template_name' or an implementation of 'get_template_names()'"
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)
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else:
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return [self.template_name]
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class TemplateView(TemplateResponseMixin, ContextMixin, View):
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"""
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Render a template. Pass keyword arguments from the URLconf to the context.
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"""
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def get(self, request, *args, **kwargs):
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context = self.get_context_data(**kwargs)
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return self.render_to_response(context)
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class RedirectView(View):
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"""Provide a redirect on any GET request."""
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permanent = False
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url = None
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pattern_name = None
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query_string = False
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def get_redirect_url(self, *args, **kwargs):
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"""
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Return the URL redirect to. Keyword arguments from the URL pattern
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match generating the redirect request are provided as kwargs to this
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method.
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"""
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if self.url:
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url = self.url % kwargs
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elif self.pattern_name:
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url = reverse(self.pattern_name, args=args, kwargs=kwargs)
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else:
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return None
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args = self.request.META.get("QUERY_STRING", "")
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if args and self.query_string:
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url = "%s?%s" % (url, args)
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return url
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def get(self, request, *args, **kwargs):
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url = self.get_redirect_url(*args, **kwargs)
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if url:
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if self.permanent:
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return HttpResponsePermanentRedirect(url)
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else:
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return HttpResponseRedirect(url)
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else:
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logger.warning(
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"Gone: %s", request.path, extra={"status_code": 410, "request": request}
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)
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return HttpResponseGone()
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def head(self, request, *args, **kwargs):
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return self.get(request, *args, **kwargs)
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def post(self, request, *args, **kwargs):
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return self.get(request, *args, **kwargs)
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def options(self, request, *args, **kwargs):
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return self.get(request, *args, **kwargs)
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def delete(self, request, *args, **kwargs):
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return self.get(request, *args, **kwargs)
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def put(self, request, *args, **kwargs):
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return self.get(request, *args, **kwargs)
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def patch(self, request, *args, **kwargs):
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return self.get(request, *args, **kwargs)
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