djangoldp/migrations/0016_alter_activity_options_alter_follower_options_and_more.py

+# Generated by Django 4.2.3 on 2023-08-31 15:27
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('djangoldp', '0015_auto_20210125_1847'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='activity',
+            options={'default_permissions': {'delete', 'change', 'view', 'add', 'control'}},
+        ),
+        migrations.AlterModelOptions(
+            name='follower',
+            options={'default_permissions': {'delete', 'change', 'view', 'add', 'control'}},
+        ),
+        migrations.AlterModelOptions(
+            name='ldpsource',
+            options={'default_permissions': {'delete', 'change', 'view', 'add', 'control'}, 'ordering': ('federation',)},
+        ),
+        migrations.AlterModelOptions(
+            name='scheduledactivity',
+            options={'default_permissions': {'delete', 'change', 'view', 'add', 'control'}},
+        ),
+    ]

djangoldp/migrations/0017_alter_activity_urlid_alter_follower_urlid_and_more.py

+# Generated by Django 4.2.3 on 2023-09-03 20:26
+
+from django.db import migrations
+import djangoldp.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('djangoldp', '0016_alter_activity_options_alter_follower_options_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='activity',
+            name='urlid',
+            field=djangoldp.fields.LDPUrlField(blank=True, db_index=True, null=True, unique=True),
+        ),
+        migrations.AlterField(
+            model_name='follower',
+            name='urlid',
+            field=djangoldp.fields.LDPUrlField(blank=True, db_index=True, null=True, unique=True),
+        ),
+        migrations.AlterField(
+            model_name='ldpsource',
+            name='urlid',
+            field=djangoldp.fields.LDPUrlField(blank=True, db_index=True, null=True, unique=True),
+        ),
+    ]

djangoldp/migrations/0018_alter_activity_payload_alter_activity_response_body.py

+# Generated by Django 4.2.3 on 2023-10-17 19:25
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('djangoldp', '0017_alter_activity_urlid_alter_follower_urlid_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='activity',
+            name='payload',
+            field=models.TextField(),
+        ),
+        migrations.AlterField(
+            model_name='activity',
+            name='response_body',
+            field=models.TextField(null=True),
+        ),
+    ]

djangoldp/models.py

 import json
+import logging
 import uuid
-from urllib.parse import urlparse
+
 from django.conf import settings
-from django.contrib.auth.models import User
-from django.core.exceptions import ObjectDoesNotExist, ValidationError
 from django.contrib.auth import get_user_model
+from django.contrib.auth.models import Group
+from django.core.exceptions import ObjectDoesNotExist, ValidationError, FieldDoesNotExist
 from django.db import models
-from django.db.models import BinaryField, DateTimeField
 from django.db.models.base import ModelBase
-from django.db.models.signals import post_save
+from django.db.models.signals import post_save, pre_save, pre_delete, m2m_changed
 from django.dispatch import receiver
-from django.urls import reverse_lazy, get_resolver
+from django.urls import get_resolver
 from django.utils.datastructures import MultiValueDictKeyError
 from django.utils.decorators import classonlymethod
+from guardian.shortcuts import assign_perm
 from rest_framework.utils import model_meta
-
 from djangoldp.fields import LDPUrlField
-from djangoldp.permissions import LDPPermissions
-import logging
-
+from djangoldp.permissions import DEFAULT_DJANGOLDP_PERMISSIONS, OwnerPermissions, InheritPermissions, ReadOnly
 
 logger = logging.getLogger('djangoldp')
 
+Group._meta.serializer_fields = ['name', 'user_set']
+Group._meta.rdf_type = 'foaf:Group'
+# Group._meta.rdf_context = {'user_set': 'foaf:member'}
+Group._meta.permission_classes = [(OwnerPermissions&ReadOnly)|InheritPermissions]
+Group._meta.owner_field = 'user'
+Group._meta.inherit_permissions = []
 
 class LDPModelManager(models.Manager):
     def local(self):
@@ -30,44 +34,21 @@ class LDPModelManager(models.Manager):
         internal_ids = [x.pk for x in queryset if not Model.is_external(x)]
         return queryset.filter(pk__in=internal_ids)
 
-    def nested_fields(self):
-        '''parses the relations on the model, and returns a list of nested field names'''
-        nested_fields = set()
-        # include all many-to-many relations
-        for field_name, relation_info in model_meta.get_field_info(self.model).relations.items():
-            if relation_info.to_many:
-                if field_name is not None:
-                    nested_fields.add(field_name)
-        # include all nested fields explicitly included on the model
-        nested_fields.update(set(Model.get_meta(self.model, 'nested_fields', set())))
-        # exclude anything marked explicitly to be excluded
-        nested_fields = nested_fields.difference(set(Model.get_meta(self.model, 'nested_fields_exclude', set())))
-        return list(nested_fields)
-
-    def fields(self):
-        return self.nested_fields()
-
-
 class Model(models.Model):
-    urlid = LDPUrlField(blank=True, null=True, unique=True)
+    urlid = LDPUrlField(blank=True, null=True, unique=True, db_index=True)
     is_backlink = models.BooleanField(default=False, help_text='set automatically to indicate the Model is a backlink')
     allow_create_backlink = models.BooleanField(default=True,
                                                 help_text='set to False to disable backlink creation after Model save')
     objects = LDPModelManager()
-    nested = LDPModelManager()
+
+    class Meta:
+        default_permissions = DEFAULT_DJANGOLDP_PERMISSIONS
+        abstract = True
+        depth = 0
 
     def __init__(self, *args, **kwargs):
         super(Model, self).__init__(*args, **kwargs)
 
-    @classmethod
-    def get_view_set(cls):
-        '''returns the view_set defined in the model Meta or the LDPViewSet class'''
-        view_set = getattr(cls._meta, 'view_set', getattr(cls.Meta, 'view_set', None))
-        if view_set is None:
-            from djangoldp.views import LDPViewSet
-            view_set = LDPViewSet
-        return view_set
-
     @classmethod
     def get_container_path(cls):
         '''returns the url path which is used to access actions on this model (e.g. /users/)'''
@@ -82,7 +63,7 @@ class Model(models.Model):
 
     @classonlymethod
     def absolute_url(cls, instance_or_model):
-        if isinstance(instance_or_model, ModelBase) or instance_or_model.urlid is None or instance_or_model.urlid == '':
+        if isinstance(instance_or_model, ModelBase) or not instance_or_model.urlid:
             return '{}{}'.format(settings.SITE_URL, Model.resource(instance_or_model))
         else:
             return instance_or_model.urlid
@@ -105,16 +86,24 @@ class Model(models.Model):
     @classonlymethod
     def slug_field(cls, instance_or_model):
         if isinstance(instance_or_model, ModelBase):
-            object_name = instance_or_model.__name__.lower()
+            model = instance_or_model
         else:
-            object_name = instance_or_model._meta.object_name.lower()
+            model = type(instance_or_model)
+        
+        # Use cached value if present
+        if hasattr(model, "_slug_field"):
+            return model._slug_field
+        object_name = model.__name__.lower()
         view_name = '{}-detail'.format(object_name)
+
         try:
             slug_field = '/{}'.format(get_resolver().reverse_dict[view_name][0][0][1][0])
         except MultiValueDictKeyError:
-            slug_field = Model.get_meta(instance_or_model, 'lookup_field', 'pk')
+            slug_field = getattr(model._meta, 'lookup_field', 'pk')
         if slug_field.startswith('/'):
             slug_field = slug_field[1:]
+        
+        model._slug_field = slug_field
         return slug_field
 
     @classonlymethod
@@ -129,11 +118,6 @@ class Model(models.Model):
 
         return path
 
-    class Meta:
-        default_permissions = ('add', 'change', 'delete', 'view', 'control')
-        abstract = True
-        depth = 0
-
     @classonlymethod
     def resolve_id(cls, id):
         '''
@@ -153,7 +137,7 @@ class Model(models.Model):
     @classonlymethod
     def resolve_parent(cls, path):
         split = path.strip('/').split('/')
-        parent_path = "/".join(split[0:len(split) - 1])
+        parent_path = "/".join(split[:-1])
         return Model.resolve_id(parent_path)
 
     @classonlymethod
@@ -170,8 +154,8 @@ class Model(models.Model):
         :param path: a URL path to check
         :return: the container model and resolved id in a tuple
         '''
-        if settings.BASE_URL in path:
-            path = path[len(settings.BASE_URL):]
+        if path.startswith(settings.BASE_URL):
+            path = path.replace(settings.BASE_URL, '')
         container = cls.resolve_container(path)
         try:
             resolve_id = cls.resolve_id(path)
@@ -220,46 +204,19 @@ class Model(models.Model):
             raise ObjectDoesNotExist
         return Model.get_or_create(model, urlid, **kwargs)
 
-    @classonlymethod
-    def get_model_rdf_type(cls, model):
-        if model is get_user_model():
-            return "foaf:user"
-        else:
-            return Model.get_meta(model, "rdf_type")
-
     @classonlymethod
     def get_subclass_with_rdf_type(cls, type):
+        #TODO: deprecate
         '''returns Model subclass with Meta.rdf_type matching parameterised type, or None'''
         if type == 'foaf:user':
             return get_user_model()
 
         for subcls in Model.__subclasses__():
-            if Model.get_meta(subcls, 'rdf_type') == type:
+            if getattr(subcls._meta, "rdf_type", None) == type:
                 return subcls
 
         return None
 
-    @classonlymethod
-    def get_permission_classes(cls, related_model, default_permissions_classes):
-        '''returns the permission_classes set in the models Meta class'''
-        return cls.get_meta(related_model, 'permission_classes', default_permissions_classes)
-
-    @classonlymethod
-    def get_meta(cls, model_class, meta_name, default=None):
-        '''returns the models Meta class'''
-        if hasattr(model_class, 'Meta'):
-            meta = getattr(model_class.Meta, meta_name, default)
-        else:
-            meta = default
-        return getattr(model_class._meta, meta_name, meta)
-
-    @staticmethod
-    def get_permissions(obj_or_model, context, filter):
-        permissions = filter
-        for permission_class in Model.get_permission_classes(obj_or_model, [LDPPermissions]):
-            permissions = permission_class().filter_user_perms(context, obj_or_model, permissions)
-        return [{'mode': {'@type': name.split('_')[0]}} for name in permissions]
-
     @classmethod
     def is_external(cls, value):
         '''
@@ -267,19 +224,24 @@ class Model(models.Model):
         :return: True if the urlid is external to the server, False otherwise
         '''
         try:
+            if not value:
+                return False
             if not isinstance(value, str):
                 value = value.urlid
 
-            return value is not None and not value.startswith(settings.SITE_URL)
+            # This expects all @ids to start with http which mlight not be universal. Maybe needs a fix.
+            return value.startswith('http') and not value.startswith(settings.SITE_URL)
         except:
             return False
 
+#TODO: this breaks the serializer, which probably assumes that traditional models don't have a urlid.
+# models.Model.urlid = property(lambda self: '{}{}'.format(settings.SITE_URL, Model.resource(self)))
 
 class LDPSource(Model):
     federation = models.CharField(max_length=255)
 
     class Meta(Model.Meta):
-        rdf_type = 'ldp:Container'
+        rdf_type = 'sib:federatedContainer'
         ordering = ('federation',)
         container_path = 'sources'
         lookup_field = 'federation'
@@ -292,42 +254,40 @@ class Activity(Model):
     '''Models an ActivityStreams Activity'''
     local_id = LDPUrlField(help_text='/inbox or /outbox url (local - this server)')  # /inbox or /outbox full url
     external_id = LDPUrlField(null=True, help_text='the /inbox or /outbox url (from the sender or receiver)')
-    payload = BinaryField()
+    payload = models.TextField()
     response_location = LDPUrlField(null=True, blank=True, help_text='Location saved activity can be found')
     response_code = models.CharField(null=True, blank=True, help_text='Response code sent by receiver', max_length=8)
-    response_body = BinaryField(null=True)
+    response_body = models.TextField(null=True)
     type = models.CharField(null=True, blank=True, help_text='the ActivityStreams type of the Activity',
                             max_length=64)
     is_finished = models.BooleanField(default=True)
-    created_at = DateTimeField(auto_now_add=True)
+    created_at = models.DateTimeField(auto_now_add=True)
     success = models.BooleanField(default=False, help_text='set to True when an Activity is successfully delivered')
 
     class Meta(Model.Meta):
         container_path = "activities"
         rdf_type = 'as:Activity'
-
-    def _bytes_to_json(self, obj):
-        if hasattr(obj, 'tobytes'):
-            obj = obj.tobytes()
-        if obj is None or obj == b'':
-            return {}
-        return json.loads(obj)
+        disable_url = True
 
     def to_activitystream(self):
-        return self._bytes_to_json(self.payload)
+        return json.loads(self.payload)
 
     def response_to_json(self):
-        return self._bytes_to_json(self.response_body)
+        return self.to_activitystream()
 
 
 # temporary database-side storage used for scheduled tasks in the ActivityQueue
 class ScheduledActivity(Activity):
-    failed_attempts = models.PositiveIntegerField(default=0, help_text='a log of how many failed retries have been made sending the activity')
+    failed_attempts = models.PositiveIntegerField(default=0,
+                                                  help_text='a log of how many failed retries have been made sending the activity')
 
     def save(self, *args, **kwargs):
         self.is_finished = False
         super(ScheduledActivity, self).save(*args, **kwargs)
 
+    class Meta(Model.Meta):
+        disable_url = True
+
 
 class Follower(Model):
     '''Models a subscription on a model. When the model is saved, an Update activity will be sent to the inbox'''
@@ -338,32 +298,74 @@ class Follower(Model):
     def __str__(self):
         return 'Inbox ' + str(self.inbox) + ' on ' + str(self.object)
 
+    class Meta(Model.Meta):
+        disable_url = True
+
+class DynamicNestedField:
+    '''
+    Used to define a method as a nested_field.
+    Usage:
+        LDPUser.circles = lambda self: Circle.objects.filter(members__user=self)
+        LDPUser.circles.field = DynamicNestedField(Circle, 'circles')
+    '''
+    related_query_name = None
+    one_to_many = False
+    many_to_many = True
+    many_to_one = False
+    one_to_one = False
+    read_only = True
+    name = ''
+    def __init__(self, model:models.Model|None, remote_name:str, name:str='', remote:object|None=None) -> None:
+        self.model = model
+        self.name = name
+        if remote:
+            self.remote_field = remote
+        else:
+            self.remote_field = DynamicNestedField(None, '', remote_name, self)
 
 @receiver([post_save])
 def auto_urlid(sender, instance, **kwargs):
     if isinstance(instance, Model):
+        changed = False
         if getattr(instance, Model.slug_field(instance), None) is None:
             setattr(instance, Model.slug_field(instance), instance.pk)
-            instance.save()
-        if (instance.urlid is None or instance.urlid == '' or 'None' in instance.urlid):
+            changed = True
+        if (not instance.urlid or 'None' in instance.urlid):
             instance.urlid = instance.get_absolute_url()
+            changed = True
+        if changed:
             instance.save()
 
+@receiver(post_save)
+def create_role_groups(sender, instance, created, **kwargs):
+    if created:
+        for name, params in getattr(instance._meta, 'permission_roles', {}).items():
+            group, x = Group.objects.get_or_create(name=f'LDP_{instance._meta.model_name}_{name}_{instance.id}')
+            setattr(instance, name, group)
+            instance.save()
+            if params.get('add_author'):
+                assert hasattr(instance._meta, 'auto_author'), "add_author requires to also define auto_author"
+                author = getattr(instance, instance._meta.auto_author)
+                if author:
+                    group.user_set.add(author)
+            for permission in params.get('perms', []):
+                assign_perm(f'{permission}_{instance._meta.model_name}', group, instance)
 
-if 'djangoldp_account' not in settings.DJANGOLDP_PACKAGES:
-    def webid(self):
-        # an external user should have urlid set
-        webid = getattr(self, 'urlid', None)
-        if webid is not None and urlparse(settings.BASE_URL).netloc != urlparse(webid).netloc:
-            webid = self.urlid
-        # local user use user-detail URL with primary key
-        else:
-            webid = '{0}{1}'.format(settings.BASE_URL, reverse_lazy('user-detail', kwargs={'pk': self.pk}))
-        return webid
 
-    get_user_model().webid = webid
+def invalidate_cache_if_has_entry(entry):
+    from djangoldp.serializers import GLOBAL_SERIALIZER_CACHE
+
+    if GLOBAL_SERIALIZER_CACHE.has(entry):
+        GLOBAL_SERIALIZER_CACHE.invalidate(entry)
+
+def invalidate_model_cache_if_has_entry(model):
+    entry = getattr(model._meta, 'label', None)
+    invalidate_cache_if_has_entry(entry)
 
+@receiver([pre_save, pre_delete])
+def invalidate_caches(sender, instance, **kwargs):
+    invalidate_model_cache_if_has_entry(sender)
 
-@receiver(post_save, sender=User)
-def update_perms(sender, instance, created, **kwargs):
-    LDPPermissions.invalidate_cache()
+@receiver([m2m_changed])
+def invalidate_caches_m2m(sender, instance, action, *args, **kwargs):
+    invalidate_model_cache_if_has_entry(kwargs['model'])
\ No newline at end of file

djangoldp/pagination.py

 from rest_framework.pagination import LimitOffsetPagination
+from rest_framework.pagination import PageNumberPagination
 from rest_framework.response import Response
 
+class LDPOffsetPagination(LimitOffsetPagination):
+    def get_paginated_response(self, data):
+        next_url = self.get_next_link()
+        previous_url = self.get_previous_link()
+
+        links = []
+        for url, label in ((previous_url, 'prev'), (next_url, 'next')):
+            if url is not None:
+                links.append('<{}>; rel="{}"'.format(url, label))
+
+        headers = {'Link': ', '.join(links)} if links else {}
+        return Response(data, headers=headers)
+
+
+class LDPPagination(PageNumberPagination):
+    page_query_param = 'p'
+    page_size_query_param = 'limit'
 
-class LDPPagination(LimitOffsetPagination):
     def get_paginated_response(self, data):
         next_url = self.get_next_link()
         previous_url = self.get_previous_link()

djangoldp/related.py

+from rest_framework.utils import model_meta
+
+
+def get_prefetch_fields(model, serializer, depth, prepend_string=''):
+    '''
+    This method should then be used with queryset.prefetch_related, to auto-fetch joined resources (to speed up nested serialization)
+    This can speed up ModelViewSet and LDPViewSet alike by as high a factor as 2
+    :param model: the model to be analysed
+    :param serializer: an LDPSerializer instance. Used to extract the fields for each nested model
+    :param depth: the depth at which to stop the recursion (should be set to the configured depth of the ViewSet)
+    :param prepend_string: should be set to the default. Used in recursive calls
+    :return: set of strings to prefetch for a given model. Including serialized nested fields and foreign keys recursively
+    called on many-to-many fields until configured depth reached
+    '''
+    # the objective is to build a list of fields and nested fields which should be prefetched for the optimisation
+    # of database queries
+    fields = set()
+
+    # get a list of all fields which would be serialized on this model
+    # TODO: dynamically generating serializer fields is necessary to retrieve many-to-many fields at depth > 0,
+    #  but the _all_ default has issues detecting reverse many-to-many fields
+    # meta_args = {'model': model, 'depth': 0, 'fields': getattr(model._meta, 'serializer_fields', '__all__')}
+    # meta_class = type('Meta', (), meta_args)
+    # serializer = (type(LDPSerializer)('TestSerializer', (LDPSerializer,), {'Meta': meta_class}))()
+    serializer_fields = set([f for f in serializer.get_fields()])
+    empty_containers = getattr(model._meta, 'empty_containers', [])
+
+    # we are only interested in foreign keys (and many-to-many relationships)
+    model_relations = model_meta.get_field_info(model).relations
+    for field_name, relation_info in model_relations.items():
+        # foreign keys can be added without fuss
+        if not relation_info.to_many:
+            fields.add((prepend_string + field_name))
+            continue
+
+        # nested fields should be added if serialized
+        if field_name in serializer_fields and field_name not in empty_containers:
+            fields.add((prepend_string + field_name))
+
+            # and they should also have their immediate foreign keys prefetched if depth not reached
+            if depth >= 0:
+                new_prepend_str = prepend_string + field_name + '__'
+                fields = fields.union(get_prefetch_fields(relation_info.related_model, serializer, depth - 1, new_prepend_str))
+
+    return fields

djangoldp/templates/swagger-ui.html

+<!DOCTYPE html>
+<html>
+
+<head>
+    <title>Swagger</title>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <link rel="stylesheet" type="text/css" href="https://unpkg.com/swagger-ui-dist@3/swagger-ui.css">
+</head>
+
+<body>
+    <div id="swagger-ui"></div>
+    <script src="https://unpkg.com/swagger-ui-dist@3/swagger-ui-bundle.js"></script>
+    <script>
+        const ui = SwaggerUIBundle({
+            url: "{% url 'schema' %}",
+            dom_id: '#swagger-ui',
+            presets: [
+                SwaggerUIBundle.presets.apis,
+                SwaggerUIBundle.SwaggerUIStandalonePreset
+            ],
+            layout: "BaseLayout",
+            requestInterceptor: (request) => {
+                request.headers['X-CSRFToken'] = "{{ csrf_token }}"
+                return request;
+            }
+        })
+    </script>
+</body>
+
+</html>
\ No newline at end of file

djangoldp/tests/djangoldp_settings.py

+"""
+This module is meant to be used as a testing LDP package.
+
+It contains configuration elements imported by a djangoldp-package
+when the django server is setup.
+"""
+
+# define an extra variables
+MYPACKAGEVAR = 'ok'
+USE_I18N = False
+
+# register an extra middleware
+MIDDLEWARE = [
+    'djangoldp.tests.dummy.middleware.DummyMiddleware'
+]
+
+# register an extra installed app
+INSTALLED_APPS = [
+    'djangoldp.tests.dummy.apps.DummyConfig'
+]
+
+SECRET_KEY = "$r&)p-4k@h5b!1yrft6&q%j)_p$lxqh6#)jeeu0z1iag&y&wdu"

djangoldp/tests/djangoldp_urls.py

-from django.conf.urls import re_path
-
-from djangoldp.permissions import LDPPermissions
-from djangoldp.tests.models import Skill, JobOffer, Message, Conversation, Dummy, PermissionlessDummy, Task, DateModel
+from django.urls import path
+from djangoldp.tests.models import Message, Conversation, Dummy, PermissionlessDummy, Task, DateModel, LDPDummy
+from djangoldp.permissions import ACLPermissions
 from djangoldp.views import LDPViewSet
 
 urlpatterns = [
-    re_path(r'^messages/', LDPViewSet.urls(model=Message, permission_classes=[LDPPermissions], fields=["@id", "text", "conversation"], nested_fields=['conversation'])),
-    re_path(r'^conversations/', LDPViewSet.urls(model=Conversation, nested_fields=["message_set"], permission_classes=[LDPPermissions])),
-    re_path(r'^tasks/', LDPViewSet.urls(model=Task, permission_classes=[LDPPermissions])),
-    re_path(r'^dates/', LDPViewSet.urls(model=DateModel, permission_classes=[LDPPermissions])),
-    re_path(r'^dummys/', LDPViewSet.urls(model=Dummy, permission_classes=[LDPPermissions], lookup_field='slug',)),
-    re_path(r'^permissionless-dummys/', LDPViewSet.urls(model=PermissionlessDummy, permission_classes=[LDPPermissions], lookup_field='slug',)),
+    path('messages/', LDPViewSet.urls(model=Message, fields=["@id", "text", "conversation"], nested_fields=['conversation'])),
+    path('tasks/', LDPViewSet.urls(model=Task)),
+    path('conversations/', LDPViewSet.urls(model=Conversation, nested_fields=["message_set", "observers"])),
+    path('dummys/', LDPViewSet.urls(model=Dummy, lookup_field='slug',)),
+    path('permissionless-dummys/', LDPViewSet.urls(model=PermissionlessDummy, lookup_field='slug', permission_classes=[ACLPermissions])),
 ]
 

djangoldp/tests/dummy/apps.py

+"""This module contains apps for testing."""
+
+from django.apps import AppConfig
+
+class DummyConfig(AppConfig):
+    # 'djangoldp.tests' is already registered as an installed app (it simulates a LDP package)
+    name = 'djangoldp.tests.dummy'

djangoldp/tests/dummy/middleware.py

+"""This module contains a dummy middleware for djangoldp testing."""
+
+class DummyMiddleware(object):
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        return self.get_response(request)