Switch to a resource and service based API from previous app based one.

Signed-off-by: Michael Price <loneviking72@gmail.com>

mayan/apps/rest_api/api_views.py

@@ -0,0 +1,18 @@
+from __future__ import unicode_literals
+
+from rest_framework import generics
+
+from rest_api.filters import MayanObjectPermissionsFilter
+from rest_api.permissions import MayanPermission
+
+from .classes import APIResource
+from .serializers import APIResourceSerializer
+
+
+class APIResourceTypeListView(generics.ListAPIView):
+    """
+    Returns a list of all the available API resources.
+    """
+    serializer_class = APIResourceSerializer
+    def get_queryset(self):
+        return APIResource.all()

mayan/apps/rest_api/classes.py

@@ -5,10 +5,35 @@ from django.conf import settings
 from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.module_loading import import_string
 
+from .exceptions import APIResourcePatternError
+
+
+@python_2_unicode_compatible
+class APIResource(object):
+    _registry = {}
+
+    @classmethod
+    def all(cls):
+        return cls._registry.values()
+
+    @classmethod
+    def get(cls, name):
+        return cls._registry[name]
+
+    def __str__(self):
+        return force_text(self.name)
+
+    def __init__(self, name, label, description=None):
+        self.label = label
+        self.name = name
+        self.description = description
+        self.__class__._registry[self.name] = self
+
 
 @python_2_unicode_compatible
 class APIEndPoint(object):
     _registry = {}
+    _patterns = []
 
     @classmethod
     def get_all(cls):
@@ -48,6 +73,12 @@ class APIEndPoint(object):
     def register_urls(self, urlpatterns):
         from .urls import urlpatterns as app_urls
 
-        app_urls += [
-            url(r'^%s/' % (self.name or self.app.name), include(urlpatterns)),
-        ]
+        for url in urlpatterns:
+            if url.regex.pattern not in self.__class__._patterns:
+                app_urls.append(url)
+                self.__class__._patterns.append(url.regex.pattern)
+            else:
+                raise APIResourcePatternError(
+                    'App "{}" tried to register API URL pattern "{}", which '
+                    'already exists'.format(self.app.label, url.regex.pattern)
+                )

mayan/apps/rest_api/exceptions.py

@@ -0,0 +1,16 @@
+from __future__ import unicode_literals
+
+
+class APIError(Exception):
+    """
+    Base exception for the API app
+    """
+    pass
+
+
+class APIResourcePatternError(APIError):
+    """
+    Raised when an app tries to override an existing URL regular expression
+    pattern
+    """
+    pass

mayan/apps/rest_api/serializers.py

@@ -0,0 +1,9 @@
+from __future__ import unicode_literals
+
+from rest_framework import serializers
+
+
+class APIResourceSerializer(serializers.Serializer):
+    description = serializers.CharField()
+    label = serializers.CharField()
+    name = serializers.CharField()

mayan/apps/rest_api/urls.py

@@ -2,15 +2,18 @@ from __future__ import unicode_literals
 
 from django.conf.urls import url
 
-from .views import APIBase, APIAppView, BrowseableObtainAuthToken
+from .api_views import APIResourceTypeListView
+from .views import APIBase, BrowseableObtainAuthToken
 
 
-urlpatterns = [
-]
+urlpatterns = []
 
 api_urls = [
     url(r'^$', APIBase.as_view(), name='api_root'),
-    url(r'^api/(?P<path>.*)/?$', APIAppView.as_view(), name='api_app'),
+    url(
+        r'^resources/$', APIResourceTypeListView.as_view(),
+        name='resource-list'
+    ),
     url(
         r'^auth/token/obtain/$', BrowseableObtainAuthToken.as_view(),
         name='auth_token_obtain'

mayan/apps/rest_api/views.py

@@ -13,13 +13,6 @@ class APIBase(SwaggerResourcesView):
     renderer_classes = (renderers.BrowsableAPIRenderer, renderers.JSONRenderer)
 
 
-class APIAppView(SwaggerApiView):
-    """
-    Entry points of the selected app.
-    """
-    renderer_classes = (renderers.BrowsableAPIRenderer, renderers.JSONRenderer)
-
-
 class BrowseableObtainAuthToken(ObtainAuthToken):
     """
     Obtain an API authentication token.