Backport support for global and object event notification. GitLab issue #262.

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

mayan/apps/authentication/apps.py

@@ -5,6 +5,7 @@ import logging
 from django.utils.translation import ugettext_lazy as _
 
 from common import MayanAppConfig, menu_user
+from navigation.classes import Separator, Text
 
 from .links import link_logout, link_password_change
 
@@ -21,6 +22,6 @@ class AuthenticationApp(MayanAppConfig):
 
         menu_user.bind_links(
             links=(
-                link_password_change, link_logout
+                Separator(), link_password_change, link_logout
             ), position=99
         )

mayan/apps/cabinets/events.py

@@ -2,13 +2,13 @@ from __future__ import absolute_import, unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
-from events.classes import Event
+from events import EventTypeNamespace
 
-event_cabinets_add_document = Event(
-    name='cabinets_add_document',
-    label=_('Document added to cabinet')
+namespace = EventTypeNamespace(name='cabinets', label=_('Cabinets'))
+
+event_cabinets_add_document = namespace.add_event_type(
+    label=_('Document added to cabinet'), name='add_document'
 )
-event_cabinets_remove_document = Event(
-    name='cabinets_remove_document',
-    label=_('Document removed from cabinet')
+event_cabinets_remove_document = namespace.add_event_type(
+    label=_('Document removed from cabinet'), name='remove_document'
 )

mayan/apps/checkouts/apps.py

@@ -10,11 +10,17 @@ from django.utils.translation import ugettext_lazy as _
 
 from acls import ModelPermission
 from common import MayanAppConfig, menu_facet, menu_main, menu_sidebar
+from common.classes import DashboardWidget
 from common.dashboards import dashboard_main
+from events import ModelEventType
 from mayan.celery import app
 from rest_api.classes import APIEndPoint
 
 from .dashboard_widgets import widget_checkouts
+from .events import (
+    event_document_auto_check_in, event_document_check_in,
+    event_document_check_out, event_document_forceful_check_in
+)
 from .handlers import check_new_version_creation
 from .links import (
     link_checkin_document, link_checkout_document, link_checkout_info,
@@ -72,6 +78,13 @@ class CheckoutsApp(MayanAppConfig):
             )
         )
 
+        ModelEventType.register(
+            model=Document, event_types=(
+                event_document_auto_check_in, event_document_check_in,
+                event_document_check_out, event_document_forceful_check_in
+            )
+        )
+
         ModelPermission.register(
             model=Document, permissions=(
                 permission_document_checkout,

mayan/apps/checkouts/events.py

@@ -2,19 +2,21 @@ from __future__ import absolute_import, unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
-from events.classes import Event
+from events import EventTypeNamespace
 
-event_document_auto_check_in = Event(
-    name='checkouts_document_auto_check_in',
+namespace = EventTypeNamespace(name='checkouts', label=_('Checkouts'))
+
+event_document_auto_check_in = namespace.add_event_type(
+    name='document_auto_check_in',
     label=_('Document automatically checked in')
 )
-event_document_check_in = Event(
-    name='checkouts_document_check_in', label=_('Document checked in')
+event_document_check_in = namespace.add_event_type(
+    name='document_check_in', label=_('Document checked in')
 )
-event_document_check_out = Event(
-    name='checkouts_document_check_out', label=_('Document checked out')
+event_document_check_out = namespace.add_event_type(
+    name='document_check_out', label=_('Document checked out')
 )
-event_document_forceful_check_in = Event(
-    name='checkouts_document_forceful_check_in',
+event_document_forceful_check_in = namespace.add_event_type(
+    name='document_forceful_check_in',
     label=_('Document forcefully checked in')
 )

mayan/apps/common/apps.py

@@ -67,8 +67,8 @@ class MayanAppConfig(apps.AppConfig):
         except ImportError as exception:
             if force_text(exception) not in ('No module named urls', 'No module named \'{}.urls\''.format(self.name)):
                 logger.error(
-                    'Import time error when running AppConfig.ready(). Check '
-                    'apps.py, urls.py, views.py, etc.'
+                    'Import time error when running AppConfig.ready() of app '
+                    '"%s".', self.name
                 )
                 raise exception
 
@@ -127,7 +127,6 @@ class CommonApp(MayanAppConfig):
                 Text(text=CommonApp.get_user_label_text), Separator(),
                 link_current_user_details, link_current_user_edit,
                 link_current_user_locale_profile_edit,
-                Separator()
             )
         )
 

mayan/apps/document_comments/apps.py

@@ -1,4 +1,4 @@
-from __future__ import unicode_literals
+from __future__ import absolute_import, unicode_literals
 
 from django.apps import apps
 from django.utils.translation import ugettext_lazy as _
@@ -6,9 +6,13 @@ from django.utils.translation import ugettext_lazy as _
 from acls import ModelPermission
 from common import MayanAppConfig, menu_facet, menu_object, menu_sidebar
 from documents.search import document_page_search, document_search
+from events import ModelEventType
 from navigation import SourceColumn
 from rest_api.classes import APIEndPoint
 
+from .events import (
+    event_document_comment_create, event_document_comment_delete
+)
 from .links import (
     link_comment_add, link_comment_delete, link_comments_for_document
 )
@@ -36,6 +40,12 @@ class DocumentCommentsApp(MayanAppConfig):
 
         Comment = self.get_model('Comment')
 
+        ModelEventType.register(
+            model=Document, event_types=(
+                event_document_comment_create, event_document_comment_delete
+            )
+        )
+
         ModelPermission.register(
             model=Document, permissions=(
                 permission_comment_create, permission_comment_delete,

mayan/apps/document_comments/events.py

@@ -2,13 +2,15 @@ from __future__ import absolute_import, unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
-from events.classes import Event
+from events import EventTypeNamespace
 
-event_document_comment_create = Event(
-    name='document_comment_create',
-    label=_('Document comment created')
+namespace = EventTypeNamespace(
+    name='document_comments', label=_('Document comments')
 )
-event_document_comment_delete = Event(
-    name='document_comment_delete',
-    label=_('Document comment deleted')
+
+event_document_comment_create = namespace.add_event_type(
+    name='create', label=_('Document comment created')
+)
+event_document_comment_delete = namespace.add_event_type(
+    name='delete', label=_('Document comment deleted')
 )

mayan/apps/document_parsing/events.py

@@ -2,13 +2,15 @@ from __future__ import absolute_import, unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
-from events.classes import Event
+from events import EventTypeNamespace
 
-event_parsing_document_version_submit = Event(
-    name='parsing_document_version_submit',
-    label=_('Document version submitted for parsing')
+namespace = EventTypeNamespace(
+    name='document_parsing', label=_('Document parsing')
 )
-event_parsing_document_version_finish = Event(
-    name='parsing_document_version_finish',
-    label=_('Document version parsing finished')
+
+event_parsing_document_version_submit = namespace.add_event_type(
+    label=_('Document version submitted for parsing'), name='version_submit'
+)
+event_parsing_document_version_finish = namespace.add_event_type(
+    label=_('Document version parsing finished'), name='version_finish'
 )

mayan/apps/document_states/handlers.py

@@ -4,7 +4,7 @@ from django.apps import apps
 from django.utils.translation import ugettext_lazy as _
 
 from document_indexing.tasks import task_index_document
-from events.classes import Event
+from events.classes import EventType
 
 
 def handler_index_document(sender, **kwargs):
@@ -42,7 +42,7 @@ def handler_trigger_transition(sender, **kwargs):
         transition = list(set(trigger_transitions) & set(workflow_instance.get_transition_choices()))[0]
 
         workflow_instance.do_transition(
-            comment=_('Event trigger: %s') % Event.get(name=action.verb).label,
+            comment=_('Event trigger: %s') % EventType.get(name=action.verb).label,
             transition=transition
         )
 

mayan/apps/document_states/migrations/0005_auto_20170803_0638.py

@@ -9,7 +9,7 @@ import django.db.models.deletion
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('events', '0001_initial'),
+        ('events', '0005_auto_20170731_0452'),
         ('document_states', '0004_workflow_internal_name'),
     ]
 

mayan/apps/document_states/models.py

@@ -17,7 +17,7 @@ from django.utils.translation import ugettext_lazy as _
 from acls.models import AccessControlList
 from common.validators import validate_internal_name
 from documents.models import Document, DocumentType
-from events.models import EventType
+from events.models import StoredEventType
 from permissions import Permission
 
 from .error_logs import error_log_state_actions
@@ -306,7 +306,8 @@ class WorkflowTransitionTriggerEvent(models.Model):
         related_name='trigger_events', verbose_name=_('Transition')
     )
     event_type = models.ForeignKey(
-        EventType, on_delete=models.CASCADE, verbose_name=_('Event type')
+        StoredEventType, on_delete=models.CASCADE,
+        verbose_name=_('Event type')
     )
 
     class Meta:

mayan/apps/document_states/views.py

@@ -17,8 +17,8 @@ from common.views import (
 )
 from documents.models import Document
 from documents.views import DocumentListView
-from events.classes import Event
-from events.models import EventType
+from events.classes import EventType
+from events.models import StoredEventType
 
 from .classes import WorkflowAction
 from .forms import (
@@ -675,7 +675,7 @@ class WorkflowStateListView(SingleObjectListView):
 
 class SetupWorkflowTransitionTriggerEventListView(FormView):
     form_class = WorkflowTransitionTriggerEventRelationshipFormSet
-    submodel = EventType
+    submodel = StoredEventType
 
     def dispatch(self, *args, **kwargs):
         messages.warning(
@@ -689,7 +689,7 @@ class SetupWorkflowTransitionTriggerEventListView(FormView):
             user=self.request.user, obj=self.get_object().workflow
         )
 
-        Event.refresh()
+        EventType.refresh()
         return super(
             SetupWorkflowTransitionTriggerEventListView, self
         ).dispatch(*args, **kwargs)
@@ -735,8 +735,10 @@ class SetupWorkflowTransitionTriggerEventListView(FormView):
         initial = []
 
         # Return the queryset by name from the sorted list of the class
-        event_type_ids = [event_type.name for event_type in Event.all()]
-        event_type_queryset = EventType.objects.filter(name__in=event_type_ids)
+        event_type_ids = [event_type.id for event_type in Event.all()]
+        event_type_queryset = StoredEventType.objects.filter(
+            name__in=event_type_ids
+        )
 
         for event_type in event_type_queryset:
             initial.append({

mayan/apps/documents/apps.py

@@ -23,7 +23,11 @@ from converter.permissions import (
     permission_transformation_delete, permission_transformation_edit,
     permission_transformation_view,
 )
-from events.links import link_events_for_object
+from events import ModelEventType
+from events.links import (
+    link_events_for_object, link_object_event_types_user_subcriptions_list,
+    link_object_event_types_user_subcriptions_list_with_icon
+)
 from events.permissions import permission_events_view
 from mayan.celery import app
 from mayan_statistics.classes import StatisticNamespace, CharJSLine
@@ -36,6 +40,12 @@ from .dashboard_widgets import (
     widget_new_documents_this_month, widget_pages_per_month,
     widget_total_documents
 )
+from .events import (
+    event_document_create, event_document_download,
+    event_document_properties_edit, event_document_type_change,
+    event_document_new_version, event_document_version_revert,
+    event_document_view
+)
 from .handlers import (
     create_default_document_type, handler_scan_duplicates_for
 )
@@ -142,6 +152,19 @@ class DocumentsApp(MayanAppConfig):
             label=_('MIME type'), name='versions__mimetype', type_name='field'
         )
 
+        ModelEventType.register(
+            model=DocumentType, event_types=(
+                event_document_create,
+            )
+        )
+        ModelEventType.register(
+            model=Document, event_types=(
+                event_document_download, event_document_properties_edit,
+                event_document_type_change, event_document_new_version,
+                event_document_version_revert, event_document_view
+            )
+        )
+
         ModelPermission.register(
             model=Document, permissions=(
                 permission_acl_edit, permission_acl_view,
@@ -389,7 +412,8 @@ class DocumentsApp(MayanAppConfig):
         menu_object.bind_links(
             links=(
                 link_document_type_edit, link_document_type_filename_list,
-                link_acl_list, link_document_type_delete
+                link_acl_list, link_object_event_types_user_subcriptions_list,
+                link_document_type_delete
             ), sources=(DocumentType,)
         )
         menu_object.bind_links(
@@ -446,8 +470,11 @@ class DocumentsApp(MayanAppConfig):
             links=(link_document_properties,), sources=(Document,), position=2
         )
         menu_facet.bind_links(
-            links=(link_events_for_object, link_document_version_list,),
-            sources=(Document,), position=2
+            links=(
+                link_events_for_object,
+                link_object_event_types_user_subcriptions_list_with_icon,
+                link_document_version_list,
+            ), sources=(Document,), position=2
         )
         menu_facet.bind_links(links=(link_document_pages,), sources=(Document,))
 

mayan/apps/documents/events.py

@@ -2,29 +2,28 @@ from __future__ import absolute_import, unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
-from events.classes import Event
+from events import EventTypeNamespace
 
-event_document_create = Event(
-    name='documents_document_create', label=_('Document created')
+namespace = EventTypeNamespace(name='documents', label=_('Documents'))
+
+event_document_create = namespace.add_event_type(
+    name='document_create', label=_('Document created')
 )
-event_document_download = Event(
-    name='documents_document_download',
-    label=_('Document downloaded')
+event_document_download = namespace.add_event_type(
+    name='document_download', label=_('Document downloaded')
 )
-event_document_properties_edit = Event(
-    name='documents_document_edit', label=_('Document properties edited')
+event_document_properties_edit = namespace.add_event_type(
+    name='document_edit', label=_('Document properties edited')
 )
-event_document_type_change = Event(
-    name='documents_document_type_change', label=_('Document type changed')
+event_document_type_change = namespace.add_event_type(
+    name='document_type_change', label=_('Document type changed')
 )
-event_document_new_version = Event(
-    name='documents_document_new_version', label=_('New version uploaded')
+event_document_new_version = namespace.add_event_type(
+    name='document_new_version', label=_('New version uploaded')
 )
-event_document_version_revert = Event(
-    name='documents_document_version_revert',
-    label=_('Document version reverted')
+event_document_version_revert = namespace.add_event_type(
+    name='document_version_revert', label=_('Document version reverted')
 )
-event_document_view = Event(
-    name='documents_document_view',
-    label=_('Document viewed')
+event_document_view = namespace.add_event_type(
+    name='document_view', label=_('Document viewed')
 )

mayan/apps/documents/models.py

@@ -222,9 +222,13 @@ class Document(models.Model):
         if new_document:
             if user:
                 self.add_as_recent_document_for_user(user)
-                event_document_create.commit(actor=user, target=self)
+                event_document_create.commit(
+                    actor=user, target=self, action_object=self.document_type
+                )
             else:
-                event_document_create.commit(target=self)
+                event_document_create.commit(
+                    target=self, action_object=self.document_type
+                )
         else:
             if _commit_events:
                 event_document_properties_edit.commit(actor=user, target=self)

mayan/apps/documents/tests/test_events.py

@@ -64,7 +64,7 @@ class DocumentEventsTestCase(GenericDocumentViewTestCase):
 
         event = Action.objects.any(obj=self.document).first()
 
-        self.assertEqual(event.verb, event_document_download.name)
+        self.assertEqual(event.verb, event_document_download.id)
         self.assertEqual(event.target, self.document)
         self.assertEqual(event.actor, self.user)
 
@@ -98,6 +98,6 @@ class DocumentEventsTestCase(GenericDocumentViewTestCase):
 
         event = Action.objects.any(obj=self.document).first()
 
-        self.assertEqual(event.verb, event_document_view.name)
+        self.assertEqual(event.verb, event_document_view.id)
         self.assertEqual(event.target, self.document)
         self.assertEqual(event.actor, self.user)

mayan/apps/events/__init__.py

@@ -1,5 +1,5 @@
 from __future__ import unicode_literals
 
-from .classes import Event  # NOQA
+from .classes import EventTypeNamespace, ModelEventType  # NOQA
 
 default_app_config = 'events.apps.EventsApp'

mayan/apps/events/admin.py

@@ -2,9 +2,19 @@ from __future__ import unicode_literals
 
 from django.contrib import admin
 
-from .models import EventType
+from .models import EventSubscription, Notification, StoredEventType
 
 
-@admin.register(EventType)
-class EventTypeAdmin(admin.ModelAdmin):
+@admin.register(EventSubscription)
+class EventSubscriptionAdmin(admin.ModelAdmin):
+    list_display = ('user', 'stored_event_type')
+
+
+@admin.register(StoredEventType)
+class StoredEventTypeAdmin(admin.ModelAdmin):
     readonly_fields = ('name', '__str__')
+
+
+@admin.register(Notification)
+class NotificationAdmin(admin.ModelAdmin):
+    list_display = ('user', 'action', 'read')

mayan/apps/events/api_views.py

@@ -10,9 +10,13 @@ from rest_framework import generics
 from acls.models import AccessControlList
 from rest_api.permissions import MayanPermission
 
-from .classes import Event
+from .classes import EventType, EventTypeNamespace
+from .models import Notification
 from .permissions import permission_events_view
-from .serializers import EventSerializer, EventTypeSerializer
+from .serializers import (
+    EventSerializer, EventTypeSerializer, EventTypeNamespaceSerializer,
+    NotificationSerializer
+)
 
 
 class APIObjectEventListView(generics.ListAPIView):
@@ -46,13 +50,72 @@ class APIObjectEventListView(generics.ListAPIView):
         return any_stream(obj)
 
 
+class APIEventTypeNamespaceDetailView(generics.RetrieveAPIView):
+    """
+    Returns the details of an event type namespace.
+    """
+    serializer_class = EventTypeNamespaceSerializer
+
+    def get_object(self):
+        try:
+            return EventTypeNamespace.get(name=self.kwargs['name'])
+        except KeyError:
+            raise Http404
+
+
+class APIEventTypeNamespaceListView(generics.ListAPIView):
+    """
+    Returns a list of all the available event type namespaces.
+    """
+
+    serializer_class = EventTypeNamespaceSerializer
+    queryset = EventTypeNamespace.all()
+
+    def get_serializer_context(self):
+        return {
+            'format': self.format_kwarg,
+            'request': self.request,
+            'view': self
+        }
+
+
+class APIEventTypeNamespaceEventTypeListView(generics.ListAPIView):
+    """
+    Returns a list of all the available event types from a namespaces.
+    """
+
+    serializer_class = EventTypeSerializer
+
+    def get_queryset(self):
+        try:
+            return EventTypeNamespace.get(
+                name=self.kwargs['name']
+            ).get_event_types()
+        except KeyError:
+            raise Http404
+
+    def get_serializer_context(self):
+        return {
+            'format': self.format_kwarg,
+            'request': self.request,
+            'view': self
+        }
+
+
 class APIEventTypeListView(generics.ListAPIView):
     """
     Returns a list of all the available event types.
     """
 
     serializer_class = EventTypeSerializer
-    queryset = sorted(Event.all(), key=lambda event: event.name)
+    queryset = EventType.all()
+
+    def get_serializer_context(self):
+        return {
+            'format': self.format_kwarg,
+            'request': self.request,
+            'view': self
+        }
 
 
 class APIEventListView(generics.ListAPIView):
@@ -64,3 +127,20 @@ class APIEventListView(generics.ListAPIView):
     permission_classes = (MayanPermission,)
     queryset = Action.objects.all()
     serializer_class = EventSerializer
+
+    def get_serializer_context(self):
+        return {
+            'format': self.format_kwarg,
+            'request': self.request,
+            'view': self
+        }
+
+
+class APINotificationListView(generics.ListAPIView):
+    """
+    Return a list of notifications for the current user.
+    """
+    serializer_class = NotificationSerializer
+
+    def get_queryset(self):
+        return Notification.objects.filter(user=self.request.user)

mayan/apps/events/apps.py

@@ -3,11 +3,19 @@ from __future__ import unicode_literals
 from django.apps import apps
 from django.utils.translation import ugettext_lazy as _
 
-from common import MayanAppConfig, menu_tools
+from common import (
+    MayanAppConfig, menu_main, menu_object, menu_secondary, menu_tools,
+    menu_user
+)
+from common.widgets import two_state_template
 from navigation import SourceColumn
 from rest_api.classes import APIEndPoint
 
-from .links import link_events_list
+from .links import (
+    link_events_list, link_event_types_subscriptions_list,
+    link_notification_mark_read, link_notification_mark_read_all,
+    link_user_notifications_list,
+)
 from .licenses import *  # NOQA
 from .widgets import event_object_link, event_type_link
 
@@ -28,6 +36,8 @@ class EventsApp(MayanAppConfig):
     def ready(self):
         super(EventsApp, self).ready()
         Action = apps.get_model(app_label='actstream', model_name='Action')
+        Notification = self.get_model(model_name='Notification')
+        StoredEventType = self.get_model(model_name='StoredEventType')
 
         APIEndPoint(app=self, version_string='1')
 
@@ -39,7 +49,7 @@ class EventsApp(MayanAppConfig):
             func=lambda context: event_actor(context['object'])
         )
         SourceColumn(
-            source=Action, label=_('Verb'),
+            source=Action, label=_('Event'),
             func=lambda context: event_type_link(context['object'])
         )
         SourceColumn(
@@ -49,4 +59,44 @@ class EventsApp(MayanAppConfig):
             )
         )
 
+        SourceColumn(
+            source=StoredEventType, label=_('Namespace'), attribute='namespace'
+        )
+        SourceColumn(
+            source=StoredEventType, label=_('Label'), attribute='label'
+        )
+
+        SourceColumn(
+            source=Notification, label=_('Timestamp'),
+            attribute='action.timestamp'
+        )
+        SourceColumn(
+            source=Notification, label=_('Actor'), attribute='action.actor'
+        )
+        SourceColumn(
+            source=Notification, label=_('Event'),
+            func=lambda context: event_type_link(context['object'].action)
+        )
+        SourceColumn(
+            source=Notification, label=_('Target'),
+            func=lambda context: event_object_link(context['object'].action)
+        )
+        SourceColumn(
+            source=Notification, label=_('Seen'),
+            func=lambda context: two_state_template(
+                state=context['object'].read
+            )
+        )
+
+        menu_main.bind_links(
+            links=(link_user_notifications_list,), position=99
+        )
+        menu_object.bind_links(
+            links=(link_notification_mark_read,), sources=(Notification,)
+        )
+        menu_secondary.bind_links(
+            links=(link_notification_mark_read_all,),
+            sources=('events:user_notifications_list',)
+        )
         menu_tools.bind_links(links=(link_events_list,))
+        menu_user.bind_links(links=(link_event_types_subscriptions_list,))

mayan/apps/events/classes.py

@@ -1,70 +1,231 @@
 from __future__ import unicode_literals
 
+import logging
+
 from django.apps import apps
-from django.utils.encoding import force_text
+from django.contrib.auth import get_user_model
+from django.core.exceptions import PermissionDenied
+from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.translation import ugettext_lazy as _
 
 from actstream import action
 
+from .permissions import permission_events_view
 
-class Event(object):
+logger = logging.getLogger(__name__)
+
+
+@python_2_unicode_compatible
+class EventTypeNamespace(object):
     _registry = {}
 
     @classmethod
     def all(cls):
-        return Event.sort(event_type_list=cls._registry.values())
+        return sorted(cls._registry.values())
+
+    @classmethod
+    def get(cls, name):
+        return cls._registry[name]
+
+    def __init__(self, name, label):
+        self.name = name
+        self.label = label
+        self.event_types = []
+        self.__class__._registry[name] = self
+
+    def __str__(self):
+        return force_text(self.label)
+
+    def add_event_type(self, name, label):
+        event_type = EventType(namespace=self, name=name, label=label)
+        self.event_types.append(event_type)
+        return event_type
+
+    def get_event_types(self):
+        return EventType.sort(event_type_list=self.event_types)
+
+
+@python_2_unicode_compatible
+class EventType(object):
+    _registry = {}
+
+    @staticmethod
+    def sort(event_type_list):
+        return sorted(
+            event_type_list, key=lambda x: (x.namespace.label, x.label)
+        )
+
+    @classmethod
+    def all(cls):
+        # Return sorted permisions by namespace.name
+        return EventType.sort(event_type_list=cls._registry.values())
 
     @classmethod
     def get(cls, name):
         try:
             return cls._registry[name]
         except KeyError:
-            raise KeyError(
-                _('Unknown or obsolete event type: {0}'.format(name))
-            )
-
-    @classmethod
-    def get_label(cls, name):
-        try:
-            return cls.get(name=name).label
-        except KeyError as exception:
-            return force_text(exception)
+            return _('Unknown or obsolete event type: %s') % name
 
     @classmethod
     def refresh(cls):
         for event_type in cls.all():
-            event_type.get_type()
+            event_type.get_stored_event_type()
 
-    @staticmethod
-    def sort(event_type_list):
-        return sorted(
-            event_type_list, key=lambda x: x.label
-        )
-
-    def __init__(self, name, label):
+    def __init__(self, namespace, name, label):
+        self.namespace = namespace
         self.name = name
         self.label = label
-        self.event_type = None
-        self.__class__._registry[name] = self
+        self.stored_event_type = None
+        self.__class__._registry[self.id] = self
 
-    def get_type(self):
-        if not self.event_type:
-            EventType = apps.get_model('events', 'EventType')
-
-            self.event_type, created = EventType.objects.get_or_create(
-                name=self.name
-            )
-
-        return self.event_type
+    def __str__(self):
+        return force_text('{}: {}'.format(self.namespace.label, self.label))
 
     def commit(self, actor=None, action_object=None, target=None):
-        if not self.event_type:
-            EventType = apps.get_model('events', 'EventType')
-            self.event_type, created = EventType.objects.get_or_create(
-                name=self.name
-            )
+        AccessControlList = apps.get_model(
+            app_label='acls', model_name='AccessControlList'
+        )
+        Action = apps.get_model(
+            app_label='actstream', model_name='Action'
+        )
+        ContentType = apps.get_model(
+            app_label='contenttypes', model_name='ContentType'
+        )
+        Notification = apps.get_model(
+            app_label='events', model_name='Notification'
+        )
 
-        action.send(
-            actor or target, actor=actor, verb=self.name,
+        results = action.send(
+            actor or target, actor=actor, verb=self.id,
             action_object=action_object, target=target
         )
+
+        for handler, result in results:
+            if isinstance(result, Action):
+                for user in get_user_model().objects.all():
+                    notification = None
+
+                    if user.event_subscriptions.filter(stored_event_type__name=result.verb).exists():
+                        if result.target:
+                            try:
+                                AccessControlList.objects.check_access(
+                                    permissions=permission_events_view,
+                                    user=user, obj=result.target
+                                )
+                            except PermissionDenied:
+                                pass
+                            else:
+                                notification = Notification.objects.create(action=result, user=user)
+                        else:
+                            notification = Notification.objects.create(action=result, user=user)
+
+                    if result.target:
+                        content_type = ContentType.objects.get_for_model(model=result.target)
+
+                        relationship = user.object_subscriptions.filter(
+                            content_type=content_type,
+                            object_id=result.target.pk,
+                            stored_event_type__name=result.verb
+                        )
+
+                        if relationship.exists():
+                            try:
+                                AccessControlList.objects.check_access(
+                                    permissions=permission_events_view,
+                                    user=user, obj=result.target
+                                )
+                            except PermissionDenied:
+                                pass
+                            else:
+                                notification = Notification.objects.create(action=result, user=user)
+                    if not notification and result.action_object:
+                        content_type = ContentType.objects.get_for_model(model=result.action_object)
+
+                        relationship = user.object_subscriptions.filter(
+                            content_type=content_type,
+                            object_id=result.action_object.pk,
+                            stored_event_type__name=result.verb
+                        )
+
+                        if relationship.exists():
+                            try:
+                                AccessControlList.objects.check_access(
+                                    permissions=permission_events_view,
+                                    user=user, obj=result.action_object
+                                )
+                            except PermissionDenied:
+                                pass
+                            else:
+                                notification = Notification.objects.create(action=result, user=user)
+
+    def get_stored_event_type(self):
+        if not self.stored_event_type:
+            StoredEventType = apps.get_model('events', 'StoredEventType')
+
+            self.stored_event_type, created = StoredEventType.objects.get_or_create(
+                name=self.id
+            )
+
+        return self.stored_event_type
+
+    @property
+    def id(self):
+        return '%s.%s' % (self.namespace.name, self.name)
+
+
+class ModelEventType(object):
+    """
+    Class to allow matching a model to a specific set of events.
+    """
+    _inheritances = {}
+    _proxies = {}
+    _registry = {}
+
+    @classmethod
+    def get_for_class(cls, klass):
+        return cls._registry.get(klass, ())
+
+    @classmethod
+    def get_for_instance(cls, instance):
+        StoredEventType = apps.get_model(
+            app_label='events', model_name='StoredEventType'
+        )
+
+        events = []
+
+        class_events = cls._registry.get(type(instance))
+
+        if class_events:
+            events.extend(class_events)
+
+        proxy = cls._proxies.get(type(instance))
+
+        if proxy:
+            events.extend(cls._registry.get(proxy))
+
+        pks = [
+            event.id for event in set(events)
+        ]
+
+        return EventType.sort(
+            event_type_list=StoredEventType.objects.filter(name__in=pks)
+        )
+
+    @classmethod
+    def get_inheritance(cls, model):
+        return cls._inheritances[model]
+
+    @classmethod
+    def register(cls, model, event_types):
+        cls._registry.setdefault(model, [])
+        for event_type in event_types:
+            cls._registry[model].append(event_type)
+
+    @classmethod
+    def register_inheritance(cls, model, related):
+        cls._inheritances[model] = related
+
+    @classmethod
+    def register_proxy(cls, source, model):
+        cls._proxies[model] = source

mayan/apps/events/forms.py

@@ -0,0 +1,122 @@
+from __future__ import unicode_literals
+
+from django import forms
+from django.forms.formsets import formset_factory
+from django.utils.translation import ugettext_lazy as _
+
+from .models import EventSubscription, ObjectEventSubscription
+
+
+class EventTypeUserRelationshipForm(forms.Form):
+    namespace = forms.CharField(
+        label=_('Namespace'), required=False,
+        widget=forms.TextInput(attrs={'readonly': 'readonly'})
+    )
+    label = forms.CharField(
+        label=_('Label'), required=False,
+        widget=forms.TextInput(attrs={'readonly': 'readonly'})
+    )
+    subscription = forms.ChoiceField(
+        label=_('Subscription'),
+        widget=forms.RadioSelect(), choices=(
+            ('none', _('No')),
+            ('subscribed', _('Subscribed')),
+        )
+    )
+
+    def __init__(self, *args, **kwargs):
+        super(EventTypeUserRelationshipForm, self).__init__(
+            *args, **kwargs
+        )
+
+        self.fields['namespace'].initial = self.initial['stored_event_type'].namespace
+        self.fields['label'].initial = self.initial['stored_event_type'].label
+
+        subscription = EventSubscription.objects.get_for(
+            stored_event_type=self.initial['stored_event_type'],
+            user=self.initial['user'],
+        )
+
+        if subscription.exists():
+            self.fields['subscription'].initial = 'subscribed'
+        else:
+            self.fields['subscription'].initial = 'none'
+
+    def save(self):
+        subscription = EventSubscription.objects.get_for(
+            stored_event_type=self.initial['stored_event_type'],
+            user=self.initial['user'],
+        )
+
+        if self.cleaned_data['subscription'] == 'none':
+            subscription.delete()
+        elif self.cleaned_data['subscription'] == 'subscribed':
+            if not subscription.exists():
+                EventSubscription.objects.create_for(
+                    stored_event_type=self.initial['stored_event_type'],
+                    user=self.initial['user']
+                )
+
+
+EventTypeUserRelationshipFormSet = formset_factory(
+    EventTypeUserRelationshipForm, extra=0
+)
+
+
+class ObjectEventTypeUserRelationshipForm(forms.Form):
+    namespace = forms.CharField(
+        label=_('Namespace'), required=False,
+        widget=forms.TextInput(attrs={'readonly': 'readonly'})
+    )
+    label = forms.CharField(
+        label=_('Label'), required=False,
+        widget=forms.TextInput(attrs={'readonly': 'readonly'})
+    )
+    subscription = forms.ChoiceField(
+        label=_('Subscription'),
+        widget=forms.RadioSelect(), choices=(
+            ('none', _('No')),
+            ('subscribed', _('Subscribed')),
+        )
+    )
+
+    def __init__(self, *args, **kwargs):
+        super(ObjectEventTypeUserRelationshipForm, self).__init__(
+            *args, **kwargs
+        )
+
+        self.fields['namespace'].initial = self.initial['stored_event_type'].namespace
+        self.fields['label'].initial = self.initial['stored_event_type'].label
+
+        subscription = ObjectEventSubscription.objects.get_for(
+            obj=self.initial['object'],
+            stored_event_type=self.initial['stored_event_type'],
+            user=self.initial['user'],
+        )
+
+        if subscription.exists():
+            self.fields['subscription'].initial = 'subscribed'
+        else:
+            self.fields['subscription'].initial = 'none'
+
+    def save(self):
+        subscription = ObjectEventSubscription.objects.get_for(
+            obj=self.initial['object'],
+            stored_event_type=self.initial['stored_event_type'],
+            user=self.initial['user'],
+        )
+
+        if self.cleaned_data['subscription'] == 'none':
+            subscription.delete()
+        elif self.cleaned_data['subscription'] == 'subscribed':
+            if not subscription.exists():
+                ObjectEventSubscription.objects.create_for(
+                    obj=self.initial['object'],
+                    stored_event_type=self.initial['stored_event_type'],
+                    user=self.initial['user']
+                )
+
+
+ObjectEventTypeUserRelationshipFormSet = formset_factory(
+    ObjectEventTypeUserRelationshipForm, extra=0
+)

mayan/apps/events/links.py

@@ -26,12 +26,44 @@ def get_kwargs_factory(variable_name):
     return get_kwargs
 
 
+def get_notification_count(context):
+    return context['request'].user.notifications.filter(read=False).count()
+
+
 link_events_list = Link(
     icon='fa fa-list-ol', permissions=(permission_events_view,),
     text=_('Events'), view='events:events_list'
 )
+link_events_details = Link(
+    text=_('Events'), view='events:events_list'
+)
 link_events_for_object = Link(
     icon='fa fa-list-ol', permissions=(permission_events_view,),
     text=_('Events'), view='events:events_for_object',
     kwargs=get_kwargs_factory('resolved_object')
 )
+link_event_types_subscriptions_list = Link(
+    icon='fa fa-list-ol', text=_('Event subscriptions'),
+    view='events:event_types_user_subcriptions_list'
+)
+link_notification_mark_read = Link(
+    args='object.pk', text=_('Mark as seen'),
+    view='events:notification_mark_read'
+)
+link_notification_mark_read_all = Link(
+    text=_('Mark all as seen'), view='events:notification_mark_read_all'
+)
+link_object_event_types_user_subcriptions_list = Link(
+    kwargs=get_kwargs_factory('resolved_object'),
+    permissions=(permission_events_view,), text=_('Subscriptions'),
+    view='events:object_event_types_user_subcriptions_list',
+)
+link_object_event_types_user_subcriptions_list_with_icon = Link(
+    kwargs=get_kwargs_factory('resolved_object'), icon='fa fa-rss',
+    permissions=(permission_events_view,), text=_('Subscriptions'),
+    view='events:object_event_types_user_subcriptions_list',
+)
+link_user_notifications_list = Link(
+    icon='fa fa-bell', text=get_notification_count,
+    view='events:user_notifications_list'
+)

mayan/apps/events/managers.py

@@ -0,0 +1,34 @@
+from __future__ import unicode_literals
+
+from django.contrib.contenttypes.models import ContentType
+from django.db import models
+
+
+class EventSubscriptionManager(models.Manager):
+    def create_for(self, stored_event_type, user):
+        return self.create(
+            stored_event_type=stored_event_type, user=user
+        )
+
+    def get_for(self, stored_event_type, user):
+        return self.filter(
+            stored_event_type=stored_event_type, user=user
+        )
+
+
+class ObjectEventSubscriptionManager(models.Manager):
+    def create_for(self, obj, stored_event_type, user):
+        content_type = ContentType.objects.get_for_model(model=obj)
+
+        return self.create(
+            content_type=content_type, object_id=obj.pk,
+            stored_event_type=stored_event_type, user=user
+        )
+
+    def get_for(self, obj, stored_event_type, user):
+        content_type = ContentType.objects.get_for_model(model=obj)
+
+        return self.filter(
+            content_type=content_type, object_id=obj.pk,
+            stored_event_type=stored_event_type, user=user
+        )

mayan/apps/events/migrations/0002_eventsubscription.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2017-07-29 07:04
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('events', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='EventSubscription',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('event_type', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='subscriptions', to='events.EventType', verbose_name='Event type')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL, verbose_name='User')),
+            ],
+            options={
+                'verbose_name': 'Event subscription',
+                'verbose_name_plural': 'Event subscriptions',
+            },
+        ),
+    ]

mayan/apps/events/migrations/0003_notification.py

@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2017-07-29 07:23
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('actstream', '0002_remove_action_data'),
+        ('events', '0002_eventsubscription'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Notification',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('read', models.BooleanField(default=False, verbose_name='Read')),
+                ('action', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='notifications', to='actstream.Action', verbose_name='Action')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='notifications', to=settings.AUTH_USER_MODEL, verbose_name='User')),
+            ],
+            options={
+                'verbose_name': 'Notification',
+                'verbose_name_plural': 'Notifications',
+            },
+        ),
+    ]

mayan/apps/events/migrations/0004_auto_20170731_0423.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2017-07-31 04:23
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('events', '0003_notification'),
+    ]
+
+    operations = [
+        migrations.RenameModel(
+            old_name='EventType',
+            new_name='StoredEventType',
+        ),
+        migrations.AlterModelOptions(
+            name='storedeventtype',
+            options={'verbose_name': 'Stored event type', 'verbose_name_plural': 'Stored event types'},
+        ),
+        migrations.RemoveField(
+            model_name='eventsubscription',
+            name='event_type',
+        ),
+        migrations.AddField(
+            model_name='eventsubscription',
+            name='stored_event_type',
+            field=models.ForeignKey(default=1, on_delete=django.db.models.deletion.CASCADE, related_name='event_subscriptions', to='events.StoredEventType', verbose_name='Event type'),
+            preserve_default=False,
+        ),
+        migrations.AlterField(
+            model_name='eventsubscription',
+            name='user',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='event_subscriptions', to=settings.AUTH_USER_MODEL, verbose_name='User'),
+        ),
+    ]

mayan/apps/events/migrations/0005_auto_20170731_0452.py

@@ -0,0 +1,86 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2017-07-31 04:52
+from __future__ import unicode_literals
+
+import re
+
+from django.db import migrations
+
+
+def update_event_types_names(apps, schema_editor):
+    Action = apps.get_model('actstream', 'Action')
+    StoredEventType = apps.get_model('events', 'StoredEventType')
+
+    known_namespaces = {
+        'documents_': 'documents.',
+        'checkouts_': 'checkouts.',
+        'document_comment_': 'document_comments.',
+        'parsing_document_': 'document_parsing.',
+        'ocr_': 'ocr.',
+        'tag_': 'tags.',
+    }
+
+    pattern = re.compile('|'.join(known_namespaces.keys()))
+
+    for event_type in StoredEventType.objects.all():
+        event_type.name = pattern.sub(
+            lambda x: known_namespaces[x.group()], event_type.name
+        )
+        event_type.save()
+
+    for action in Action.objects.all():
+        action.verb = pattern.sub(
+            lambda x: known_namespaces[x.group()], action.verb
+        )
+        action.save()
+
+
+def revert_event_types_names(apps, schema_editor):
+    Action = apps.get_model('actstream', 'Action')
+    StoredEventType = apps.get_model('events', 'StoredEventType')
+
+    known_namespaces = {
+        'documents\.': 'documents_',
+        'checkouts\.': 'checkouts_',
+        'document_comments\.': 'document_comment_',
+        'document_parsing\.': 'parsing_document_',
+        'ocr\.': 'ocr_',
+        'tags\.': 'tag_',
+    }
+
+    pattern = re.compile('|'.join(known_namespaces.keys()))
+
+    for event_type in StoredEventType.objects.all():
+        old_name = event_type.name
+        new_name = pattern.sub(
+            lambda x: known_namespaces[x.group().replace('.', '\\.')],
+            event_type.name
+        )
+        event_type.name = new_name
+        if old_name == new_name:
+            event_type.delete()
+        else:
+            event_type.save()
+
+    for action in Action.objects.all():
+        new_name = pattern.sub(
+            lambda x: known_namespaces[x.group().replace('.', '\\.')],
+            action.verb
+        )
+        action.verb = new_name
+        action.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('events', '0004_auto_20170731_0423'),
+        ('actstream', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=update_event_types_names,
+            reverse_code=revert_event_types_names
+        ),
+    ]

mayan/apps/events/migrations/0006_objecteventsubscription.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2017-07-31 06:40
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('events', '0005_auto_20170731_0452'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ObjectEventSubscription',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('object_id', models.PositiveIntegerField()),
+                ('content_type', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='contenttypes.ContentType')),
+                ('stored_event_type', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='object_subscriptions', to='events.StoredEventType', verbose_name='Event type')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='object_subscriptions', to=settings.AUTH_USER_MODEL, verbose_name='User')),
+            ],
+            options={
+                'verbose_name': 'Object event subscription',
+                'verbose_name_plural': 'Object event subscriptions',
+            },
+        ),
+    ]

mayan/apps/events/models.py

@@ -1,28 +1,111 @@
 from __future__ import unicode_literals
 
+from django.conf import settings
+from django.contrib.contenttypes.fields import GenericForeignKey
+from django.contrib.contenttypes.models import ContentType
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
+from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.translation import ugettext_lazy as _
 
-from .classes import Event
+from actstream.models import Action
+
+from .classes import EventType
+from .managers import (
+    EventSubscriptionManager, ObjectEventSubscriptionManager
+)
 
 
 @python_2_unicode_compatible
-class EventType(models.Model):
+class StoredEventType(models.Model):
     name = models.CharField(
         max_length=64, unique=True, verbose_name=_('Name')
     )
 
     class Meta:
-        verbose_name = _('Event type')
-        verbose_name_plural = _('Event types')
+        verbose_name = _('Stored event type')
+        verbose_name_plural = _('Stored event types')
 
     def __str__(self):
-        return self.get_class().label
+        return force_text(self.get_class())
 
     def get_class(self):
-        return Event.get(name=self.name)
+        return EventType.get(name=self.name)
 
     @property
     def label(self):
         return self.get_class().label
+
+    @property
+    def namespace(self):
+        return self.get_class().namespace
+
+
+@python_2_unicode_compatible
+class EventSubscription(models.Model):
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL, db_index=True, on_delete=models.CASCADE,
+        related_name='event_subscriptions', verbose_name=_('User')
+    )
+    stored_event_type = models.ForeignKey(
+        StoredEventType, on_delete=models.CASCADE,
+        related_name='event_subscriptions', verbose_name=_('Event type')
+    )
+
+    objects = EventSubscriptionManager()
+
+    class Meta:
+        verbose_name = _('Event subscription')
+        verbose_name_plural = _('Event subscriptions')
+
+    def __str__(self):
+        return force_text(self.stored_event_type)
+
+
+@python_2_unicode_compatible
+class Notification(models.Model):
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL, db_index=True, on_delete=models.CASCADE,
+        related_name='notifications', verbose_name=_('User')
+    )
+    action = models.ForeignKey(
+        Action, on_delete=models.CASCADE, related_name='notifications',
+        verbose_name=_('Action')
+    )
+    read = models.BooleanField(default=False, verbose_name=_('Read'))
+
+    class Meta:
+        ordering = ('-action__timestamp',)
+        verbose_name = _('Notification')
+        verbose_name_plural = _('Notifications')
+
+    def __str__(self):
+        return force_text(self.action)
+
+
+@python_2_unicode_compatible
+class ObjectEventSubscription(models.Model):
+    content_type = models.ForeignKey(
+        ContentType, on_delete=models.CASCADE,
+    )
+    object_id = models.PositiveIntegerField()
+    content_object = GenericForeignKey(
+        ct_field='content_type',
+        fk_field='object_id',
+    )
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL, db_index=True, on_delete=models.CASCADE,
+        related_name='object_subscriptions', verbose_name=_('User')
+    )
+    stored_event_type = models.ForeignKey(
+        StoredEventType, on_delete=models.CASCADE,
+        related_name='object_subscriptions', verbose_name=_('Event type')
+    )
+
+    objects = ObjectEventSubscriptionManager()
+
+    class Meta:
+        verbose_name = _('Object event subscription')
+        verbose_name_plural = _('Object event subscriptions')
+
+    def __str__(self):
+        return force_text(self.stored_event_type)

mayan/apps/events/serializers.py

@@ -4,30 +4,59 @@ from django.utils.six import string_types
 
 from actstream.models import Action
 from rest_framework import serializers
+from rest_framework.reverse import reverse
 
 from common.serializers import ContentTypeSerializer
 from rest_api.fields import DynamicSerializerField
+from user_management.serializers import UserSerializer
 
-from .classes import Event
-from .models import EventType
+from .classes import EventType
+from .models import Notification, StoredEventType
+
+
+class EventTypeNamespaceSerializer(serializers.Serializer):
+    label = serializers.CharField()
+    name = serializers.CharField()
+    url = serializers.SerializerMethodField()
+
+    event_types_url = serializers.HyperlinkedIdentityField(
+        lookup_field='name',
+        view_name='rest_api:event-type-namespace-event-type-list',
+    )
+
+    def get_url(self, instance):
+        return reverse(
+            'rest_api:event-type-namespace-detail', args=(
+                instance.name,
+            ), request=self.context['request'], format=self.context['format']
+        )
 
 
 class EventTypeSerializer(serializers.Serializer):
     label = serializers.CharField()
     name = serializers.CharField()
+    id = serializers.CharField()
+    event_type_namespace_url = serializers.SerializerMethodField()
+
+    def get_event_type_namespace_url(self, instance):
+        return reverse(
+            'rest_api:event-type-namespace-detail', args=(
+                instance.namespace.name,
+            ), request=self.context['request'], format=self.context['format']
+        )
 
     def to_representation(self, instance):
-        if isinstance(instance, Event):
+        if isinstance(instance, EventType):
             return super(EventTypeSerializer, self).to_representation(
                 instance
             )
-        elif isinstance(instance, EventType):
+        elif isinstance(instance, StoredEventType):
             return super(EventTypeSerializer, self).to_representation(
                 instance.get_class()
             )
         elif isinstance(instance, string_types):
             return super(EventTypeSerializer, self).to_representation(
-                Event.get(name=instance)
+                EventType.get(name=instance)
             )
 
 
@@ -43,3 +72,12 @@ class EventSerializer(serializers.ModelSerializer):
             'action_object_content_type', 'action_object_object_id'
         )
         model = Action
+
+
+class NotificationSerializer(serializers.ModelSerializer):
+    user = UserSerializer(read_only=True)
+    action = EventSerializer(read_only=True)
+
+    class Meta:
+        fields = ('action', 'read', 'user')
+        model = Notification

mayan/apps/events/urls.py

@@ -3,9 +3,15 @@ from __future__ import unicode_literals
 from django.conf.urls import url
 
 from .api_views import (
-    APIEventListView, APIEventTypeListView, APIObjectEventListView
+    APIEventListView, APIEventTypeListView, APIEventTypeNamespaceDetailView,
+    APIEventTypeNamespaceEventTypeListView, APIEventTypeNamespaceListView,
+    APINotificationListView, APIObjectEventListView
+)
+from .views import (
+    EventListView, EventTypeSubscriptionListView, NotificationListView,
+    NotificationMarkRead, NotificationMarkReadAll, ObjectEventListView,
+    ObjectEventTypeSubscriptionListView, VerbEventListView
 )
-from .views import EventListView, ObjectEventListView, VerbEventListView
 
 urlpatterns = [
     url(r'^all/$', EventListView.as_view(), name='events_list'),
@@ -14,16 +20,60 @@ urlpatterns = [
         ObjectEventListView.as_view(), name='events_for_object'
     ),
     url(
-        r'^by_verb/(?P<verb>[\w\-]+)/$', VerbEventListView.as_view(),
+        r'^by_verb/(?P<verb>[\w\-\.]+)/$', VerbEventListView.as_view(),
         name='events_by_verb'
     ),
+    url(
+        r'^notifications/(?P<pk>\d+)/mark_read/$',
+        NotificationMarkRead.as_view(), name='notification_mark_read'
+    ),
+    url(
+        r'^notifications/all/mark_read/$',
+        NotificationMarkReadAll.as_view(), name='notification_mark_read_all'
+    ),
+    url(
+        r'^user/(?P<app_label>[-\w]+)/(?P<model>[-\w]+)/(?P<object_id>\d+)/subscriptions/$',
+        ObjectEventTypeSubscriptionListView.as_view(),
+        name='object_event_types_user_subcriptions_list'
+    ),
+    url(
+        r'^user/event_types/subscriptions/$',
+        EventTypeSubscriptionListView.as_view(),
+        name='event_types_user_subcriptions_list'
+    ),
+    url(
+        r'^user/notifications/$',
+        NotificationListView.as_view(),
+        name='user_notifications_list'
+    ),
 ]
 
 api_urls = [
-    url(r'^types/$', APIEventTypeListView.as_view(), name='event-type-list'),
+    url(
+        r'^event_type_namespaces/(?P<name>[-\w]+)/$',
+        APIEventTypeNamespaceDetailView.as_view(),
+        name='event-type-namespace-detail'
+    ),
+    url(
+        r'^event_type_namespaces/(?P<name>[-\w]+)/event_types/$',
+        APIEventTypeNamespaceEventTypeListView.as_view(),
+        name='event-type-namespace-event-type-list'
+    ),
+    url(
+        r'^event_type_namespaces/$', APIEventTypeNamespaceListView.as_view(),
+        name='event-type-namespace-list'
+    ),
+    url(
+        r'^event_types/$', APIEventTypeListView.as_view(),
+        name='event-type-list'
+    ),
     url(r'^events/$', APIEventListView.as_view(), name='event-list'),
     url(
-        r'^object/(?P<app_label>[-\w]+)/(?P<model>[-\w]+)/(?P<object_id>\d+)/events/$',
+        r'^notifications/$', APINotificationListView.as_view(),
+        name='notification-list'
+    ),
+    url(
+        r'^objects/(?P<app_label>[-\w]+)/(?P<model>[-\w]+)/(?P<object_id>\d+)/events/$',
         APIObjectEventListView.as_view(), name='object-event-list'
     ),
 ]

mayan/apps/events/views.py

@@ -1,17 +1,24 @@
 from __future__ import absolute_import, unicode_literals
 
+from django.contrib import messages
 from django.contrib.contenttypes.models import ContentType
-from django.http import Http404
+from django.http import Http404, HttpResponseRedirect
 from django.shortcuts import get_object_or_404
+from django.urls import reverse
 from django.utils.translation import ugettext_lazy as _
 
 from actstream.models import Action, any_stream
 
 from acls.models import AccessControlList
+from common.generics import FormView, SimpleView
 from common.utils import encapsulate
 from common.views import SingleObjectListView
 
-from .classes import Event
+from .classes import EventType, ModelEventType
+from .forms import (
+    EventTypeUserRelationshipFormSet, ObjectEventTypeUserRelationshipFormSet
+)
+from .models import StoredEventType
 from .permissions import permission_events_view
 from .widgets import event_object_link
 
@@ -37,6 +44,96 @@ class EventListView(SingleObjectListView):
         return Action.objects.all()
 
 
+class EventTypeSubscriptionListView(FormView):
+    form_class = EventTypeUserRelationshipFormSet
+    main_model = 'user'
+    submodel = StoredEventType
+
+    def dispatch(self, *args, **kwargs):
+        EventType.refresh()
+        return super(EventTypeSubscriptionListView, self).dispatch(*args, **kwargs)
+
+    def form_valid(self, form):
+        try:
+            for instance in form:
+                instance.save()
+        except Exception as exception:
+            messages.error(
+                self.request,
+                _('Error updating event subscription; %s') % exception
+            )
+        else:
+            messages.success(
+                self.request, _('Event subscriptions updated successfully')
+            )
+
+        return super(
+            EventTypeSubscriptionListView, self
+        ).form_valid(form=form)
+
+    def get_object(self):
+        return self.request.user
+
+    def get_extra_context(self):
+        return {
+            'form_display_mode_table': True,
+            'object': self.get_object(),
+            'title': _(
+                'Event subscriptions'
+            ) % self.get_object()
+        }
+
+    def get_initial(self):
+        obj = self.get_object()
+        initial = []
+
+        for element in self.get_queryset():
+            initial.append({
+                'user': obj,
+                'main_model': self.main_model,
+                'stored_event_type': element,
+            })
+        return initial
+
+    def get_queryset(self):
+        # Return the queryset by name from the sorted list of the class
+        event_type_ids = [event_type.id for event_type in EventType.all()]
+        return self.submodel.objects.filter(name__in=event_type_ids)
+
+    def get_post_action_redirect(self):
+        return reverse('common:current_user_details')
+
+
+class NotificationListView(SingleObjectListView):
+    def get_extra_context(self):
+        return {
+            'hide_object': True,
+            'object': self.request.user,
+            'title': _('Notifications'),
+        }
+
+    def get_object_list(self):
+        return self.request.user.notifications.all()
+
+
+class NotificationMarkRead(SimpleView):
+    def dispatch(self, *args, **kwargs):
+        self.get_queryset().filter(pk=self.kwargs['pk']).update(read=True)
+        return HttpResponseRedirect(reverse('events:user_notifications_list'))
+
+    def get_queryset(self):
+        return self.request.user.notifications.all()
+
+
+class NotificationMarkReadAll(SimpleView):
+    def dispatch(self, *args, **kwargs):
+        self.get_queryset().update(read=True)
+        return HttpResponseRedirect(reverse('events:user_notifications_list'))
+
+    def get_queryset(self):
+        return self.request.user.notifications.all()
+
+
 class ObjectEventListView(EventListView):
     view_permissions = None
 
@@ -73,6 +170,76 @@ class ObjectEventListView(EventListView):
         return any_stream(self.content_object)
 
 
+class ObjectEventTypeSubscriptionListView(FormView):
+    form_class = ObjectEventTypeUserRelationshipFormSet
+
+    def dispatch(self, *args, **kwargs):
+        EventType.refresh()
+        return super(ObjectEventTypeSubscriptionListView, self).dispatch(*args, **kwargs)
+
+    def form_valid(self, form):
+        try:
+            for instance in form:
+                instance.save()
+        except Exception as exception:
+            messages.error(
+                self.request,
+                _('Error updating object event subscription; %s') % exception
+            )
+        else:
+            messages.success(
+                self.request, _('Object event subscriptions updated successfully')
+            )
+
+        return super(
+            ObjectEventTypeSubscriptionListView, self
+        ).form_valid(form=form)
+
+    def get_object(self):
+        object_content_type = get_object_or_404(
+            ContentType, app_label=self.kwargs['app_label'],
+            model=self.kwargs['model']
+        )
+
+        try:
+            content_object = object_content_type.get_object_for_this_type(
+                pk=self.kwargs['object_id']
+            )
+        except object_content_type.model_class().DoesNotExist:
+            raise Http404
+
+        AccessControlList.objects.check_access(
+            permissions=permission_events_view, user=self.request.user,
+            obj=content_object
+        )
+
+        return content_object
+
+    def get_extra_context(self):
+        return {
+            'form_display_mode_table': True,
+            'object': self.get_object(),
+            'title': _(
+                'Event subscriptions for: %s'
+            ) % self.get_object()
+        }
+
+    def get_initial(self):
+        obj = self.get_object()
+        initial = []
+
+        for element in self.get_queryset():
+            initial.append({
+                'user': self.request.user,
+                'object': obj,
+                'stored_event_type': element,
+            })
+        return initial
+
+    def get_queryset(self):
+        return ModelEventType.get_for_instance(instance=self.get_object())
+
+
 class VerbEventListView(SingleObjectListView):
     def get_extra_context(self):
         return {
@@ -87,7 +254,7 @@ class VerbEventListView(SingleObjectListView):
             'hide_object': True,
             'title': _(
                 'Events of type: %s'
-            ) % Event.get_label(self.kwargs['verb']),
+            ) % EventType.get(name=self.kwargs['verb']),
         }
 
     def get_object_list(self):

mayan/apps/events/widgets.py

@@ -3,7 +3,7 @@ from __future__ import unicode_literals
 from django.urls import reverse
 from django.utils.safestring import mark_safe
 
-from .classes import Event
+from .classes import EventType
 
 
 def event_object_link(entry, attribute='target'):
@@ -26,6 +26,6 @@ def event_type_link(entry):
     return mark_safe(
         '<a href="%(url)s">%(label)s</a>' % {
             'url': reverse('events:events_by_verb', kwargs={'verb': entry.verb}),
-            'label': Event.get_label(entry.verb)
+            'label': EventType.get(name=entry.verb)
         }
     )

mayan/apps/ocr/events.py

@@ -2,13 +2,15 @@ from __future__ import absolute_import, unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
-from events.classes import Event
+from events import EventTypeNamespace
 
-event_ocr_document_version_submit = Event(
-    name='ocr_document_version_submit',
-    label=_('Document version submitted for OCR')
+namespace = EventTypeNamespace(name='ocr', label=_('OCR'))
+
+event_ocr_document_version_submit = namespace.add_event_type(
+    label=_('Document version submitted for OCR'),
+    name='document_version_submit'
 )
-event_ocr_document_version_finish = Event(
-    name='ocr_document_version_finish',
-    label=_('Document version OCR finished')
+event_ocr_document_version_finish = namespace.add_event_type(
+    label=_('Document version OCR finished'),
+    name='document_version_finish'
 )

mayan/apps/rest_api/fields.py

@@ -24,7 +24,10 @@ class DynamicSerializerField(serializers.ReadOnlyField):
         for klass, serializer_class in self.serializers.items():
             if isinstance(value, klass):
                 return serializer_class(
-                    context={'request': self.context['request']}
+                    context={
+                        'format': self.context['format'],
+                        'request': self.context['request']
+                    }
                 ).to_representation(instance=value)
 
         return _('Unable to find serializer class for: %s') % value

mayan/apps/sources/models.py

@@ -124,7 +124,7 @@ class Source(models.Model):
                 logger.critical(
                     'Unexpected exception while trying to create version for '
                     'new document "%s" from source "%s"; %s',
-                    label or file_object.name, self, exception
+                    label or file_object.name, self, exception, exc_info=True
                 )
                 document.delete(to_trash=False)
                 raise

mayan/apps/tags/events.py

@@ -2,13 +2,13 @@ from __future__ import absolute_import, unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
-from events.classes import Event
+from events import EventTypeNamespace
 
-event_tag_attach = Event(
-    name='tag_attach',
-    label=_('Tag attached to document')
+namespace = EventTypeNamespace(name='tags', label=_('Tags'))
+
+event_tag_attach = namespace.add_event_type(
+    label=_('Tag attached to document'), name='attach'
 )
-event_tag_remove = Event(
-    name='tag_remove',
-    label=_('Tag removed from document')
+event_tag_remove = namespace.add_event_type(
+    label=_('Tag removed from document'), name='remove'
 )