Refactoring some basics

djangorestframework/authentication.py

@@ -39,13 +39,14 @@ class BaseAuthentication(object):
 
 class BasicAuthentication(BaseAuthentication):
     """
-    Use HTTP Basic authentication.
+    Base class for HTTP Basic authentication.
+    Subclasses should implement `.authenticate_credentials()`.
     """
 
     def authenticate(self, request):
         """
-        Returns a :obj:`User` if a correct username and password have been supplied
-        using HTTP Basic authentication.  Otherwise returns :const:`None`.
+        Returns a `User` if a correct username and password have been supplied
+        using HTTP Basic authentication.  Otherwise returns `None`.
         """
         from django.utils.encoding import smart_unicode, DjangoUnicodeDecodeError
 
@@ -58,15 +59,30 @@ class BasicAuthentication(BaseAuthentication):
                     return None
 
                 try:
-                    uname, passwd = smart_unicode(auth_parts[0]), smart_unicode(auth_parts[2])
+                    userid, password = smart_unicode(auth_parts[0]), smart_unicode(auth_parts[2])
                 except DjangoUnicodeDecodeError:
                     return None
 
-                user = authenticate(username=uname, password=passwd)
-                if user is not None and user.is_active:
-                    return user
+                return self.authenticate_credentials(userid, password)
         return None
 
+    def authenticate_credentials(self, userid, password):
+        """
+        Given the Basic authentication userid and password, authenticate
+        and return a user instance.
+        """
+        raise NotImplementedError('.authenticate_credentials() must be overridden')
+
+
+class UserBasicAuthentication(BasicAuthentication):
+    def authenticate_credentials(self, userid, password):
+        """
+        Authenticate the userid and password against username and password.
+        """
+        user = authenticate(username=userid, password=password)
+        if user is not None and user.is_active:
+            return user
+
 
 class SessionAuthentication(BaseAuthentication):
     """

djangorestframework/exceptions.py

@@ -25,7 +25,7 @@ class ParseError(APIException):
 
 class PermissionDenied(APIException):
     status_code = status.HTTP_403_FORBIDDEN
-    default_detail = 'You do not have permission to access this resource.'
+    default_detail = 'You do not have permission to perform this action.'
 
     def __init__(self, detail=None):
         self.detail = detail or self.default_detail

djangorestframework/permissions.py

@@ -52,7 +52,7 @@ class IsAdminUser(BasePermission):
     """
 
     def check_permission(self, request, obj=None):
-        if request.user and request.user.is_staff():
+        if request.user and request.user.is_staff:
             return True
         return False
 
@@ -82,7 +82,7 @@ class DjangoModelPermissions(BasePermission):
     """
 
     # Map methods into required permission codes.
-    # Override this if you need to also provide 'read' permissions,
+    # Override this if you need to also provide 'view' permissions,
     # or if you want to provide custom permission codes.
     perms_map = {
         'GET': [],

djangorestframework/response.py

@@ -144,9 +144,9 @@ class Response(SimpleTemplateResponse):
         # attempting more specific media types first
         # NB. The inner loop here isn't as bad as it first looks :)
         #     Worst case is we're looping over len(accept_list) * len(self.renderers)
-        for media_type_list in order_by_precedence(accepts):
+        for media_type_set in order_by_precedence(accepts):
             for renderer in renderers:
-                for media_type in media_type_list:
+                for media_type in media_type_set:
                     if renderer.can_handle_response(media_type):
                         return renderer, media_type
 

djangorestframework/tests/renderers.py

@@ -246,9 +246,9 @@ class JSONPRendererTests(TestCase):
         Test JSONP rendering with View JSON Renderer.
         """
         resp = self.client.get('/jsonp/jsonrenderer',
-                               HTTP_ACCEPT='application/json-p')
+                               HTTP_ACCEPT='application/javascript')
         self.assertEquals(resp.status_code, 200)
-        self.assertEquals(resp['Content-Type'], 'application/json-p')
+        self.assertEquals(resp['Content-Type'], 'application/javascript')
         self.assertEquals(resp.content, 'callback(%s);' % _flat_repr)
 
     def test_without_callback_without_json_renderer(self):
@@ -256,9 +256,9 @@ class JSONPRendererTests(TestCase):
         Test JSONP rendering without View JSON Renderer.
         """
         resp = self.client.get('/jsonp/nojsonrenderer',
-                               HTTP_ACCEPT='application/json-p')
+                               HTTP_ACCEPT='application/javascript')
         self.assertEquals(resp.status_code, 200)
-        self.assertEquals(resp['Content-Type'], 'application/json-p')
+        self.assertEquals(resp['Content-Type'], 'application/javascript')
         self.assertEquals(resp.content, 'callback(%s);' % _flat_repr)
 
     def test_with_callback(self):
@@ -267,9 +267,9 @@ class JSONPRendererTests(TestCase):
         """
         callback_func = 'myjsonpcallback'
         resp = self.client.get('/jsonp/nojsonrenderer?callback=' + callback_func,
-                               HTTP_ACCEPT='application/json-p')
+                               HTTP_ACCEPT='application/javascript')
         self.assertEquals(resp.status_code, 200)
-        self.assertEquals(resp['Content-Type'], 'application/json-p')
+        self.assertEquals(resp['Content-Type'], 'application/javascript')
         self.assertEquals(resp.content, '%s(%s);' % (callback_func, _flat_repr))
 
 

djangorestframework/views.py

@@ -21,15 +21,6 @@ from djangorestframework.settings import api_settings
 from djangorestframework import parsers, authentication, status, exceptions, mixins
 
 
-__all__ = (
-    'View',
-    'ModelView',
-    'InstanceModelView',
-    'ListModelView',
-    'ListOrCreateModelView'
-)
-
-
 def _remove_trailing_string(content, trailing):
     """
     Strip trailing component `trailing` from `content` if it exists.
@@ -65,11 +56,6 @@ def _camelcase_to_spaces(content):
 
 
 class APIView(_View):
-    """
-    Handles incoming requests and maps them to REST operations.
-    Performs request deserialization, response serialization, authentication and input validation.
-    """
-
     renderers = api_settings.DEFAULT_RENDERERS
     """
     List of renderer classes the view can serialize the response with, ordered by preference.
@@ -81,7 +67,7 @@ class APIView(_View):
     """
 
     authentication = (authentication.SessionAuthentication,
-                      authentication.BasicAuthentication)
+                      authentication.UserBasicAuthentication)
     """
     List of all authenticating methods to attempt.
     """
@@ -155,10 +141,21 @@ class APIView(_View):
     def http_method_not_allowed(self, request, *args, **kwargs):
         """
         Called if `request.method` does not corrospond to a handler method.
-        We raise an exception, which is handled by `.handle_exception()`.
         """
         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)
+
     @property
     def _parsed_media_types(self):
         """
@@ -208,35 +205,29 @@ class APIView(_View):
 
     def check_permissions(self, request, obj=None):
         """
-        Check user permissions and either raise an ``PermissionDenied`` or return.
+        Check if request should be permitted.
         """
         for permission in self.get_permissions():
             if not permission.check_permission(request, obj):
-                raise exceptions.PermissionDenied()
+                self.permission_denied(request)
 
     def check_throttles(self, request):
         """
-        Check throttles and either raise a `Throttled` exception or return.
+        Check if request should be throttled.
         """
         for throttle in self.get_throttles():
             if not throttle.check_throttle(request):
-                raise exceptions.Throttled(throttle.wait())
+                self.throttled(request, throttle.wait())
 
-    def initial(self, request, *args, **kargs):
+    def initialize_request(self, request, *args, **kargs):
         """
-        This method runs prior to anything else in the view.
-        It should return the initial request object.
-
-        You may need to override this if you want to do things like set
-        `request.upload_handlers` before the authentication and dispatch
-        handling is run.
+        Returns the initial request object.
         """
         return Request(request, parsers=self.parsers, authentication=self.authentication)
 
-    def final(self, request, response, *args, **kargs):
+    def finalize_response(self, request, response, *args, **kargs):
         """
-        This method runs after everything else in the view.
-        It should return the final response object.
+        Returns the final response object.
         """
         if isinstance(response, Response):
             response.view = self
@@ -248,6 +239,13 @@ class APIView(_View):
 
         return response
 
+    def initial(self, request, *args, **kwargs):
+        """
+        Runs anything that needs to occur prior to calling the method handlers.
+        """
+        self.check_permissions(request)
+        self.check_throttles(request)
+
     def handle_exception(self, exc):
         """
         Handle any exception that occurs, by returning an appropriate response,
@@ -270,16 +268,24 @@ class APIView(_View):
     # all other authentication is CSRF exempt.
     @csrf_exempt
     def dispatch(self, request, *args, **kwargs):
+        """
+        `APIView.dispatch()` is pretty much the same as Django's regular
+        `View.dispatch()`, except that it includes hooks to:
+
+        * Initialize the request object.
+        * Finalize the response object.
+        * Handle exceptions that occur in the handler method.
+        * An initial hook for code such as permission checking that should
+          occur prior to running the method handlers.
+        """
+        request = self.initialize_request(request, *args, **kwargs)
+        self.request = request
         self.args = args
         self.kwargs = kwargs
         self.headers = self.default_response_headers
 
         try:
-            self.request = self.initial(request, *args, **kwargs)
-
-            # Check that the request is allowed
-            self.check_permissions(request)
-            self.check_throttles(request)
+            self.initial(request, *args, **kwargs)
 
             # Get the appropriate handler method
             if request.method.lower() in self.http_method_names:
@@ -292,7 +298,7 @@ class APIView(_View):
         except Exception as exc:
             response = self.handle_exception(exc)
 
-        self.response = self.final(request, response, *args, **kwargs)
+        self.response = self.finalize_response(request, response, *args, **kwargs)
         return self.response