Convert the API URL system from an App based one

to a resource based one.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/rest_api/classes.py

@@ -4,9 +4,33 @@ from django.conf.urls import include, url
 from django.conf import settings
 from django.utils.module_loading import import_string
 
+from .exceptions import APIResourcePatternError
+
+
+class APIResource(object):
+    _registry = {}
+
+    @classmethod
+    def all(cls):
+        return cls._registry.values()
+
+    @classmethod
+    def get(cls, name):
+        return cls._registry[name]
+
+    def __unicode__(self):
+        return unicode(self.name)
+
+    def __init__(self, name, label, description=None):
+        self.label = label
+        self.name = name
+        self.description = description
+        self.__class__._registry[self.name] = self
+
 
 class APIEndPoint(object):
     _registry = {}
+    _patterns = []
 
     @classmethod
     def get_all(cls):
@@ -46,6 +70,12 @@ 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)
+                )