mirror of
https://github.com/encode/django-rest-framework.git
synced 2025-10-30 23:47:53 +03:00
293 lines
9.7 KiB
Python
293 lines
9.7 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.http import HttpResponse
|
|
from django.utils.html import escape
|
|
from django.utils.safestring import mark_safe
|
|
from django.views.decorators.csrf import csrf_exempt
|
|
|
|
from djangorestframework.compat import View as DjangoView, apply_markdown
|
|
from djangorestframework.response import Response, ErrorResponse
|
|
from djangorestframework.mixins import *
|
|
from djangorestframework import resources, renderers, parsers, authentication, permissions, status
|
|
|
|
|
|
__all__ = (
|
|
'View',
|
|
'ModelView',
|
|
'InstanceModelView',
|
|
'ListModelView',
|
|
'ListOrCreateModelView'
|
|
)
|
|
|
|
|
|
def _remove_trailing_string(content, trailing):
|
|
"""
|
|
Strip trailing component `trailing` from `content` if it exists.
|
|
Used when generating names from view/resource 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))
|
|
return re.sub(re.compile(whitespace_pattern, re.MULTILINE), '', content)
|
|
return content
|
|
|
|
|
|
def _camelcase_to_spaces(content):
|
|
"""
|
|
Translate 'CamelCaseNames' to 'Camel Case Names'.
|
|
Used when generating names from view/resource classes.
|
|
"""
|
|
camelcase_boundry = '(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|$)))'
|
|
return re.sub(camelcase_boundry, ' \\1', content).strip()
|
|
|
|
|
|
_resource_classes = (
|
|
None,
|
|
resources.Resource,
|
|
resources.FormResource,
|
|
resources.ModelResource
|
|
)
|
|
|
|
|
|
class View(ResourceMixin, RequestMixin, ResponseMixin, AuthMixin, DjangoView):
|
|
"""
|
|
Handles incoming requests and maps them to REST operations.
|
|
Performs request deserialization, response serialization, authentication and input validation.
|
|
"""
|
|
|
|
resource = None
|
|
"""
|
|
The resource to use when validating requests and filtering responses,
|
|
or `None` to use default behaviour.
|
|
"""
|
|
|
|
renderers = renderers.DEFAULT_RENDERERS
|
|
"""
|
|
List of renderers the resource can serialize the response with, ordered by preference.
|
|
"""
|
|
|
|
parsers = parsers.DEFAULT_PARSERS
|
|
"""
|
|
List of parsers the resource can parse the request with.
|
|
"""
|
|
|
|
authentication = (authentication.UserLoggedInAuthentication,
|
|
authentication.BasicAuthentication)
|
|
"""
|
|
List of all authenticating methods to attempt.
|
|
"""
|
|
|
|
permissions = (permissions.FullAnonAccess,)
|
|
"""
|
|
List of all permissions that must be checked.
|
|
"""
|
|
|
|
@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(View, 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)]
|
|
|
|
def get_name(self):
|
|
"""
|
|
Return the resource or view class name for use as this view's name.
|
|
Override to customize.
|
|
"""
|
|
# If this view has a resource that's been overridden, then use that resource for the name
|
|
if getattr(self, 'resource', None) not in _resource_classes:
|
|
name = self.resource.__name__
|
|
name = _remove_trailing_string(name, 'Resource')
|
|
name += getattr(self, '_suffix', '')
|
|
|
|
# If it's a view class with no resource then grok the name from the class name
|
|
else:
|
|
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 = None
|
|
|
|
# If this view has a resource that's been overridden,
|
|
# then try to use the resource's docstring
|
|
if getattr(self, 'resource', None) not in _resource_classes:
|
|
description = self.resource.__doc__
|
|
|
|
# Otherwise use the view docstring
|
|
if not description:
|
|
description = self.__doc__ or ''
|
|
|
|
description = _remove_leading_indent(description)
|
|
|
|
if not isinstance(description, unicode):
|
|
description = description.decode('UTF-8')
|
|
|
|
if html:
|
|
return self.markup_description(description)
|
|
return description
|
|
|
|
def markup_description(self, description):
|
|
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):
|
|
"""
|
|
Return an HTTP 405 error if an operation is called which does not have a handler method.
|
|
"""
|
|
raise ErrorResponse(status.HTTP_405_METHOD_NOT_ALLOWED,
|
|
{'detail': 'Method \'%s\' not allowed on this resource.' % self.method})
|
|
|
|
def initial(self, request, *args, **kargs):
|
|
"""
|
|
Hook for any code that needs to run prior to anything else.
|
|
Required if you want to do things like set `request.upload_handlers` before
|
|
the authentication and dispatch handling is run.
|
|
"""
|
|
pass
|
|
|
|
def final(self, request, response, *args, **kargs):
|
|
"""
|
|
Hook for any code that needs to run after everything else in the view.
|
|
"""
|
|
# Always add these headers.
|
|
response.headers['Allow'] = ', '.join(self.allowed_methods)
|
|
# sample to allow caching using Vary http header
|
|
response.headers['Vary'] = 'Authenticate, Accept'
|
|
|
|
# merge with headers possibly set at some point in the view
|
|
response.headers.update(self.headers)
|
|
return self.render(response)
|
|
|
|
def add_header(self, field, value):
|
|
"""
|
|
Add *field* and *value* to the :attr:`headers` attribute of the :class:`View` class.
|
|
"""
|
|
self.headers[field] = value
|
|
|
|
# Note: session based authentication is explicitly CSRF validated,
|
|
# all other authentication is CSRF exempt.
|
|
@csrf_exempt
|
|
def dispatch(self, request, *args, **kwargs):
|
|
self.request = request
|
|
self.args = args
|
|
self.kwargs = kwargs
|
|
self.headers = {}
|
|
|
|
try:
|
|
self.initial(request, *args, **kwargs)
|
|
|
|
# Authenticate and check request has the relevant permissions
|
|
self._check_permissions()
|
|
|
|
# Get the appropriate handler method
|
|
if self.method.lower() in self.http_method_names:
|
|
handler = getattr(self, self.method.lower(), self.http_method_not_allowed)
|
|
else:
|
|
handler = self.http_method_not_allowed
|
|
|
|
response_obj = handler(request, *args, **kwargs)
|
|
|
|
# Allow return value to be either HttpResponse, Response, or an object, or None
|
|
if isinstance(response_obj, HttpResponse):
|
|
return response_obj
|
|
elif isinstance(response_obj, Response):
|
|
response = response_obj
|
|
elif response_obj is not None:
|
|
response = Response(status.HTTP_200_OK, response_obj)
|
|
else:
|
|
response = Response(status.HTTP_204_NO_CONTENT)
|
|
|
|
# Pre-serialize filtering (eg filter complex objects into natively serializable types)
|
|
response.cleaned_content = self.filter_response(response.raw_content)
|
|
|
|
except ErrorResponse, exc:
|
|
response = exc.response
|
|
|
|
return self.final(request, response, *args, **kwargs)
|
|
|
|
def options(self, request, *args, **kwargs):
|
|
response_obj = {
|
|
'name': self.get_name(),
|
|
'description': self.get_description(),
|
|
'renders': self._rendered_media_types,
|
|
'parses': self._parsed_media_types,
|
|
}
|
|
form = self.get_bound_form()
|
|
if form is not None:
|
|
field_name_types = {}
|
|
for name, field in form.fields.iteritems():
|
|
field_name_types[name] = field.__class__.__name__
|
|
response_obj['fields'] = field_name_types
|
|
# Note 'ErrorResponse' is misleading, it's just any response
|
|
# that should be rendered and returned immediately, without any
|
|
# response filtering.
|
|
raise ErrorResponse(status.HTTP_200_OK, response_obj)
|
|
|
|
|
|
class ModelView(View):
|
|
"""
|
|
A RESTful view that maps to a model in the database.
|
|
"""
|
|
resource = resources.ModelResource
|
|
|
|
|
|
class InstanceModelView(ReadModelMixin, UpdateModelMixin, DeleteModelMixin, ModelView):
|
|
"""
|
|
A view which provides default operations for read/update/delete against a model instance.
|
|
"""
|
|
_suffix = 'Instance'
|
|
|
|
|
|
class ListModelView(ListModelMixin, ModelView):
|
|
"""
|
|
A view which provides default operations for list, against a model in the database.
|
|
"""
|
|
_suffix = 'List'
|
|
|
|
|
|
class ListOrCreateModelView(ListModelMixin, CreateModelMixin, ModelView):
|
|
"""
|
|
A view which provides default operations for list and create, against a model in the database.
|
|
"""
|
|
_suffix = 'List'
|