Implements #81 - webhook event backend (#1640)

* merge branch develop

* bugfix, signals for virtualization's class wasn't correctly defined

* updated webhooks for 2.4 and cleanup

* updated docs to cover changes to supervisor config

* review changes and further cleanup

* updated redis connection settings

* cleanup settings

netbox/extras/admin.py

@@ -4,7 +4,11 @@ from django import forms
 from django.contrib import admin
 from django.utils.safestring import mark_safe
 
-from .models import CustomField, CustomFieldChoice, Graph, ExportTemplate, TopologyMap, UserAction
+from utilities.forms import LaxURLField
+from .models import (
+    CustomField, CustomFieldChoice, Graph, ExportTemplate, TopologyMap, UserAction,
+    Webhook
+)
 
 
 def order_content_types(field):
@@ -15,6 +19,36 @@ def order_content_types(field):
     field.choices = [(ct.pk, '{} > {}'.format(ct.app_label, ct.name)) for ct in queryset]
 
 
+#
+# Webhooks
+#
+
+class WebhookForm(forms.ModelForm):
+
+    payload_url = LaxURLField()
+
+    class Meta:
+        model = Webhook
+        exclude = []
+
+    def __init__(self, *args, **kwargs):
+        super(WebhookForm, self).__init__(*args, **kwargs)
+
+        order_content_types(self.fields['obj_type'])
+
+
+@admin.register(Webhook)
+class WebhookAdmin(admin.ModelAdmin):
+    list_display = [
+        'name', 'models', 'payload_url', 'http_content_type', 'enabled', 'type_create', 'type_update',
+        'type_delete', 'ssl_verification',
+    ]
+    form = WebhookForm
+
+    def models(self, obj):
+        return ', '.join([ct.name for ct in obj.obj_type.all()])
+
+
 #
 # Custom fields
 #