mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-09-21 11:29:01 +03:00
272 lines
9.5 KiB
Python
272 lines
9.5 KiB
Python
"""
|
|
The :mod:`views` module provides the Views you will most probably
|
|
be subclassing in your implementation.
|
|
|
|
By setting or modifying class attributes on your view, you change it's predefined behaviour.
|
|
"""
|
|
|
|
import re
|
|
from django.core.exceptions import PermissionDenied
|
|
from django.http import Http404
|
|
from django.utils.html import escape
|
|
from django.utils.safestring import mark_safe
|
|
from django.views.decorators.csrf import csrf_exempt
|
|
from rest_framework import status, exceptions
|
|
from rest_framework.compat import View, apply_markdown
|
|
from rest_framework.response import Response
|
|
from rest_framework.request import Request
|
|
from rest_framework.settings import api_settings
|
|
|
|
|
|
def _remove_trailing_string(content, trailing):
|
|
"""
|
|
Strip trailing component `trailing` from `content` if it exists.
|
|
Used when generating names from view classes.
|
|
"""
|
|
if content.endswith(trailing) and content != trailing:
|
|
return content[:-len(trailing)]
|
|
return content
|
|
|
|
|
|
def _remove_leading_indent(content):
|
|
"""
|
|
Remove leading indent from a block of text.
|
|
Used when generating descriptions from docstrings.
|
|
"""
|
|
whitespace_counts = [len(line) - len(line.lstrip(' '))
|
|
for line in content.splitlines()[1:] if line.lstrip()]
|
|
|
|
# unindent the content if needed
|
|
if whitespace_counts:
|
|
whitespace_pattern = '^' + (' ' * min(whitespace_counts))
|
|
content = re.sub(re.compile(whitespace_pattern, re.MULTILINE), '', content)
|
|
content = content.strip('\n')
|
|
return content
|
|
|
|
|
|
def _camelcase_to_spaces(content):
|
|
"""
|
|
Translate 'CamelCaseNames' to 'Camel Case Names'.
|
|
Used when generating names from view classes.
|
|
"""
|
|
camelcase_boundry = '(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|$)))'
|
|
return re.sub(camelcase_boundry, ' \\1', content).strip()
|
|
|
|
|
|
class APIView(View):
|
|
settings = api_settings
|
|
|
|
renderer_classes = api_settings.DEFAULT_RENDERERS
|
|
parser_classes = api_settings.DEFAULT_PARSERS
|
|
authentication_classes = api_settings.DEFAULT_AUTHENTICATION
|
|
throttle_classes = api_settings.DEFAULT_THROTTLES
|
|
permission_classes = api_settings.DEFAULT_PERMISSIONS
|
|
content_negotiation_class = api_settings.DEFAULT_CONTENT_NEGOTIATION
|
|
|
|
@classmethod
|
|
def as_view(cls, **initkwargs):
|
|
"""
|
|
Override the default :meth:`as_view` to store an instance of the view
|
|
as an attribute on the callable function. This allows us to discover
|
|
information about the view when we do URL reverse lookups.
|
|
"""
|
|
view = super(APIView, cls).as_view(**initkwargs)
|
|
view.cls_instance = cls(**initkwargs)
|
|
return view
|
|
|
|
@property
|
|
def allowed_methods(self):
|
|
"""
|
|
Return the list of allowed HTTP methods, uppercased.
|
|
"""
|
|
return [method.upper() for method in self.http_method_names
|
|
if hasattr(self, method)]
|
|
|
|
@property
|
|
def default_response_headers(self):
|
|
return {
|
|
'Allow': ', '.join(self.allowed_methods),
|
|
'Vary': 'Accept'
|
|
}
|
|
|
|
def get_name(self):
|
|
"""
|
|
Return the resource or view class name for use as this view's name.
|
|
Override to customize.
|
|
"""
|
|
name = self.__class__.__name__
|
|
name = _remove_trailing_string(name, 'View')
|
|
return _camelcase_to_spaces(name)
|
|
|
|
def get_description(self, html=False):
|
|
"""
|
|
Return the resource or view docstring for use as this view's description.
|
|
Override to customize.
|
|
"""
|
|
description = self.__doc__ or ''
|
|
description = _remove_leading_indent(description)
|
|
if html:
|
|
return self.markup_description(description)
|
|
return description
|
|
|
|
def markup_description(self, description):
|
|
"""
|
|
Apply HTML markup to the description of this view.
|
|
"""
|
|
if apply_markdown:
|
|
description = apply_markdown(description)
|
|
else:
|
|
description = escape(description).replace('\n', '<br />')
|
|
return mark_safe(description)
|
|
|
|
def http_method_not_allowed(self, request, *args, **kwargs):
|
|
"""
|
|
Called if `request.method` does not corrospond to a handler method.
|
|
"""
|
|
raise exceptions.MethodNotAllowed(request.method)
|
|
|
|
def permission_denied(self, request):
|
|
"""
|
|
If request is not permitted, determine what kind of exception to raise.
|
|
"""
|
|
raise exceptions.PermissionDenied()
|
|
|
|
def throttled(self, request, wait):
|
|
"""
|
|
If request is throttled, determine what kind of exception to raise.
|
|
"""
|
|
raise exceptions.Throttled(wait)
|
|
|
|
def get_format_suffix(self, **kwargs):
|
|
"""
|
|
Determine if the request includes a '.json' style format suffix
|
|
"""
|
|
if self.settings.FORMAT_SUFFIX_KWARG:
|
|
return kwargs.get(self.settings.FORMAT_SUFFIX_KWARG)
|
|
|
|
def get_renderers(self, format=None):
|
|
"""
|
|
Instantiates and returns the list of renderers that this view can use.
|
|
"""
|
|
return [renderer(self) for renderer in self.renderer_classes]
|
|
|
|
def get_permissions(self):
|
|
"""
|
|
Instantiates and returns the list of permissions that this view requires.
|
|
"""
|
|
return [permission(self) for permission in self.permission_classes]
|
|
|
|
def get_throttles(self):
|
|
"""
|
|
Instantiates and returns the list of thottles that this view uses.
|
|
"""
|
|
return [throttle(self) for throttle in self.throttle_classes]
|
|
|
|
def perform_content_negotiation(self, request, force=False):
|
|
"""
|
|
Determine which renderer and media type to use render the response.
|
|
"""
|
|
renderers = self.get_renderers()
|
|
conneg = self.content_negotiation_class()
|
|
return conneg.negotiate(request, renderers, self.format, force)
|
|
|
|
def has_permission(self, request, obj=None):
|
|
"""
|
|
Return `True` if the request should be permitted.
|
|
"""
|
|
for permission in self.get_permissions():
|
|
if not permission.has_permission(request, obj):
|
|
return False
|
|
return True
|
|
|
|
def check_throttles(self, request):
|
|
"""
|
|
Check if request should be throttled.
|
|
"""
|
|
for throttle in self.get_throttles():
|
|
if not throttle.allow_request(request):
|
|
self.throttled(request, throttle.wait())
|
|
|
|
def initialize_request(self, request, *args, **kargs):
|
|
"""
|
|
Returns the initial request object.
|
|
"""
|
|
return Request(request, parser_classes=self.parser_classes,
|
|
authentication_classes=self.authentication_classes)
|
|
|
|
def initial(self, request, *args, **kwargs):
|
|
"""
|
|
Runs anything that needs to occur prior to calling the method handlers.
|
|
"""
|
|
self.format = self.get_format_suffix(**kwargs)
|
|
if not self.has_permission(request):
|
|
self.permission_denied(request)
|
|
self.check_throttles(request)
|
|
self.renderer, self.accepted_media_type = self.perform_content_negotiation(request)
|
|
|
|
def finalize_response(self, request, response, *args, **kwargs):
|
|
"""
|
|
Returns the final response object.
|
|
"""
|
|
if isinstance(response, Response):
|
|
if not getattr(self, 'renderer', None):
|
|
self.renderer, self.accepted_media_type = self.perform_content_negotiation(request, force=True)
|
|
response.renderer = self.renderer
|
|
response.accepted_media_type = self.accepted_media_type
|
|
|
|
for key, value in self.headers.items():
|
|
response[key] = value
|
|
|
|
return response
|
|
|
|
def handle_exception(self, exc):
|
|
"""
|
|
Handle any exception that occurs, by returning an appropriate response,
|
|
or re-raising the error.
|
|
"""
|
|
if isinstance(exc, exceptions.Throttled):
|
|
# Throttle wait header
|
|
self.headers['X-Throttle-Wait-Seconds'] = '%d' % exc.wait
|
|
|
|
if isinstance(exc, exceptions.APIException):
|
|
return Response({'detail': exc.detail}, status=exc.status_code)
|
|
elif isinstance(exc, Http404):
|
|
return Response({'detail': 'Not found'},
|
|
status=status.HTTP_404_NOT_FOUND)
|
|
elif isinstance(exc, PermissionDenied):
|
|
return Response({'detail': 'Permission denied'},
|
|
status=status.HTTP_403_FORBIDDEN)
|
|
raise
|
|
|
|
# Note: session based authentication is explicitly CSRF validated,
|
|
# all other authentication is CSRF exempt.
|
|
@csrf_exempt
|
|
def dispatch(self, request, *args, **kwargs):
|
|
"""
|
|
`.dispatch()` is pretty much the same as Django's regular dispatch,
|
|
but with extra hooks for startup, finalize, and exception handling.
|
|
"""
|
|
request = self.initialize_request(request, *args, **kwargs)
|
|
self.request = request
|
|
self.args = args
|
|
self.kwargs = kwargs
|
|
self.headers = self.default_response_headers
|
|
|
|
try:
|
|
self.initial(request, *args, **kwargs)
|
|
|
|
# Get the appropriate handler method
|
|
if request.method.lower() in self.http_method_names:
|
|
handler = getattr(self, request.method.lower(),
|
|
self.http_method_not_allowed)
|
|
else:
|
|
handler = self.http_method_not_allowed
|
|
|
|
response = handler(request, *args, **kwargs)
|
|
|
|
except Exception as exc:
|
|
response = self.handle_exception(exc)
|
|
|
|
self.response = self.finalize_response(request, response, *args, **kwargs)
|
|
return self.response
|