Added SchemaGenerator class

rest_framework/routers.py

@@ -18,16 +18,15 @@ from __future__ import unicode_literals
 import itertools
 from collections import OrderedDict, namedtuple
 
-import uritemplate
 from django.conf.urls import url
 from django.core.exceptions import ImproperlyConfigured
 from django.core.urlresolvers import NoReverseMatch
 
 from rest_framework import exceptions, renderers, views
 from rest_framework.compat import coreapi
-from rest_framework.request import override_method
 from rest_framework.response import Response
 from rest_framework.reverse import reverse
+from rest_framework.schemas import SchemaGenerator
 from rest_framework.settings import api_settings
 from rest_framework.urlpatterns import format_suffix_patterns
 
@@ -263,63 +262,6 @@ class SimpleRouter(BaseRouter):
 
         return ret
 
-    def get_links(self, request=None):
-        content = {}
-
-        for prefix, viewset, basename in self.registry:
-            lookup_field = getattr(viewset, 'lookup_field', 'pk')
-            lookup_url_kwarg = getattr(viewset, 'lookup_url_kwarg', None) or lookup_field
-            lookup_placeholder = '{' + lookup_url_kwarg + '}'
-
-            routes = self.get_routes(viewset)
-
-            for route in routes:
-                url = '/' + route.url.format(
-                    prefix=prefix,
-                    lookup=lookup_placeholder,
-                    trailing_slash=self.trailing_slash
-                ).lstrip('^').rstrip('$')
-
-                mapping = self.get_method_map(viewset, route.mapping)
-                if not mapping:
-                    continue
-
-                for method, action in mapping.items():
-                    link = self.get_link(viewset, url, method, request)
-                    if link is None:
-                        continue  # User does not have permissions.
-                    if prefix not in content:
-                        content[prefix] = {}
-                    content[prefix][action] = link
-        return content
-
-    def get_link(self, viewset, url, method, request=None):
-        view_instance = viewset()
-        if request is not None:
-            with override_method(view_instance, request, method.upper()) as request:
-                try:
-                    view_instance.check_permissions(request)
-                except exceptions.APIException:
-                    return None
-
-        fields = []
-
-        for variable in uritemplate.variables(url):
-            field = coreapi.Field(name=variable, location='path', required=True)
-            fields.append(field)
-
-        if method in ('put', 'patch', 'post'):
-            cls = view_instance.get_serializer_class()
-            serializer = cls()
-            for field in serializer.fields.values():
-                if field.read_only:
-                    continue
-                required = field.required and method != 'patch'
-                field = coreapi.Field(name=field.source, location='form', required=required)
-                fields.append(field)
-
-        return coreapi.Link(url=url, action=method, fields=fields)
-
 
 class DefaultRouter(SimpleRouter):
     """
@@ -334,7 +276,7 @@ class DefaultRouter(SimpleRouter):
         self.schema_title = kwargs.pop('schema_title', None)
         super(DefaultRouter, self).__init__(*args, **kwargs)
 
-    def get_api_root_view(self):
+    def get_api_root_view(self, schema_urls=None):
         """
         Return a view to use as the API root.
         """
@@ -345,10 +287,10 @@ class DefaultRouter(SimpleRouter):
 
         view_renderers = list(api_settings.DEFAULT_RENDERER_CLASSES)
 
-        if self.schema_title:
+        if schema_urls and self.schema_title:
             assert coreapi, '`coreapi` must be installed for schema support.'
             view_renderers += [renderers.CoreJSONRenderer]
-            router = self
+            schema_generator = SchemaGenerator(patterns=schema_urls)
 
         class APIRoot(views.APIView):
             _ignore_model_permissions = True
@@ -356,10 +298,9 @@ class DefaultRouter(SimpleRouter):
 
             def get(self, request, *args, **kwargs):
                 if request.accepted_renderer.format == 'corejson':
-                    content = router.get_links(request)
-                    if not content:
+                    schema = schema_generator.get_schema(request)
+                    if schema is None:
                         raise exceptions.PermissionDenied()
-                    schema = coreapi.Document(title=router.schema_title, content=content)
                     return Response(schema)
 
                 ret = OrderedDict()
@@ -388,15 +329,13 @@ class DefaultRouter(SimpleRouter):
         Generate the list of URL patterns, including a default root view
         for the API, and appending `.json` style format suffixes.
         """
-        urls = []
+        urls = super(DefaultRouter, self).get_urls()
 
         if self.include_root_view:
-            root_url = url(r'^$', self.get_api_root_view(), name=self.root_view_name)
+            view = self.get_api_root_view(schema_urls=urls)
+            root_url = url(r'^$', view, name=self.root_view_name)
             urls.append(root_url)
 
-        default_urls = super(DefaultRouter, self).get_urls()
-        urls.extend(default_urls)
-
         if self.include_format_suffixes:
             urls = format_suffix_patterns(urls)
 

rest_framework/schemas.py

@@ -0,0 +1,176 @@
+from importlib import import_module
+
+import coreapi
+import uritemplate
+from django.conf import settings
+from django.contrib.admindocs.views import simplify_regex
+from django.core.urlresolvers import RegexURLPattern, RegexURLResolver
+from django.utils import six
+
+from rest_framework import exceptions
+from rest_framework.request import clone_request
+from rest_framework.views import APIView
+
+
+class SchemaGenerator(object):
+    default_mapping = {
+        'get': 'read',
+        'post': 'create',
+        'put': 'update',
+        'patch': 'partial_update',
+        'delete': 'destroy',
+    }
+
+    def __init__(self, schema_title=None, patterns=None, urlconf=None):
+        if patterns is None and urlconf is not None:
+            if isinstance(urlconf, six.string_types):
+                urls = import_module(urlconf)
+            else:
+                urls = urlconf
+            patterns = urls.urlpatterns
+        elif patterns is None and urlconf is None:
+            urls = import_module(settings.ROOT_URLCONF)
+            patterns = urls.urlpatterns
+
+        self.schema_title = schema_title
+        self.endpoints = self.get_api_endpoints(patterns)
+
+    def get_schema(self, request=None):
+        if request is None:
+            endpoints = self.endpoints
+        else:
+            # Filter the list of endpoints to only include those that
+            # the user has permission on.
+            endpoints = []
+            for key, link, callback in self.endpoints:
+                method = link.action.upper()
+                view = callback.cls()
+                view.request = clone_request(request, method)
+                try:
+                    view.check_permissions(view.request)
+                except exceptions.APIException:
+                    pass
+                else:
+                    endpoints.append((key, link, callback))
+
+        if not endpoints:
+            return None
+
+        # Generate the schema content structure, from the endpoints.
+        # ('users', 'list'), Link -> {'users': {'list': Link()}}
+        content = {}
+        for key, link, callback in endpoints:
+            insert_into = content
+            for item in key[:1]:
+                if item not in insert_into:
+                    insert_into[item] = {}
+                insert_into = insert_into[item]
+            insert_into[key[-1]] = link
+
+        # Return the schema document.
+        return coreapi.Document(title=self.schema_title, content=content)
+
+    def get_api_endpoints(self, patterns, prefix=''):
+        """
+        Return a list of all available API endpoints by inspecting the URL conf.
+        """
+        api_endpoints = []
+
+        for pattern in patterns:
+            path_regex = prefix + pattern.regex.pattern
+
+            if isinstance(pattern, RegexURLPattern):
+                path = self.get_path(path_regex)
+                callback = pattern.callback
+                if self.include_endpoint(path, callback):
+                    for method in self.get_allowed_methods(callback):
+                        key = self.get_key(path, method, callback)
+                        link = self.get_link(path, method, callback)
+                        endpoint = (key, link, callback)
+                        api_endpoints.append(endpoint)
+
+            elif isinstance(pattern, RegexURLResolver):
+                nested_endpoints = self.get_api_endpoints(
+                    patterns=pattern.url_patterns,
+                    prefix=path_regex
+                )
+                api_endpoints.extend(nested_endpoints)
+
+        return api_endpoints
+
+    def get_path(self, path_regex):
+        """
+        Given a URL conf regex, return a URI template string.
+        """
+        path = simplify_regex(path_regex)
+        path = path.replace('<', '{').replace('>', '}')
+        return path
+
+    def include_endpoint(self, path, callback):
+        """
+        Return True if the given endpoint should be included.
+        """
+        cls = getattr(callback, 'cls', None)
+        if (cls is None) or not issubclass(cls, APIView):
+            return False
+
+        if path.endswith('.{format}') or path.endswith('.{format}/'):
+            return False
+
+        if path == '/':
+            return False
+
+        return True
+
+    def get_allowed_methods(self, callback):
+        """
+        Return a list of the valid HTTP methods for this endpoint.
+        """
+        if hasattr(callback, 'actions'):
+            return [method.upper() for method in callback.actions.keys()]
+
+        return [
+            method for method in
+            callback.cls().allowed_methods if method != 'OPTIONS'
+        ]
+
+    def get_key(self, path, method, callback):
+        """
+        Return a tuple of strings, indicating the identity to use for a
+        given endpoint. eg. ('users', 'list').
+        """
+        category = None
+        for item in path.strip('/').split('/'):
+            if '{' in item:
+                break
+            category = item
+
+        actions = getattr(callback, 'actions', self.default_mapping)
+        action = actions[method.lower()]
+
+        if category:
+            return (category, action)
+        return (action,)
+
+    def get_link(self, path, method, callback):
+        """
+        Return a `coreapi.Link` instance for the given endpoint.
+        """
+        view = callback.cls()
+        fields = []
+
+        for variable in uritemplate.variables(path):
+            field = coreapi.Field(name=variable, location='path', required=True)
+            fields.append(field)
+
+        if method in ('PUT', 'PATCH', 'POST'):
+            serializer_class = view.get_serializer_class()
+            serializer = serializer_class()
+            for field in serializer.fields.values():
+                if field.read_only:
+                    continue
+                required = field.required and method != 'PATCH'
+                field = coreapi.Field(name=field.source, location='form', required=required)
+                fields.append(field)
+
+        return coreapi.Link(url=path, action=method.lower(), fields=fields)

rest_framework/viewsets.py

@@ -98,6 +98,7 @@ class ViewSetMixin(object):
         # resolved URL.
         view.cls = cls
         view.suffix = initkwargs.get('suffix', None)
+        view.actions = actions
         return csrf_exempt(view)
 
     def initialize_request(self, request, *args, **kwargs):

tests/test_routers.py

@@ -257,7 +257,7 @@ class TestNameableRoot(TestCase):
 
     def test_router_has_custom_name(self):
         expected = 'nameable-root'
-        self.assertEqual(expected, self.urls[0].name)
+        self.assertEqual(expected, self.urls[-1].name)
 
 
 class TestActionKeywordArgs(TestCase):