Webfinger utils

api/funkwhale_api/federation/webfinger.py

@@ -0,0 +1,52 @@
+from django import forms
+from django.conf import settings
+from django.urls import reverse
+
+from . import utils
+VALID_RESOURCE_TYPES = ['acct']
+
+
+def clean_resource(resource_string):
+    if not resource_string:
+        raise forms.ValidationError('Invalid resource string')
+
+    try:
+        resource_type, resource = resource_string.split(':', 1)
+    except ValueError:
+        raise forms.ValidationError('Missing webfinger resource type')
+
+    if resource_type not in VALID_RESOURCE_TYPES:
+        raise forms.ValidationError('Invalid webfinger resource type')
+
+    return resource_type, resource
+
+
+def clean_acct(acct_string):
+    try:
+        username, hostname = acct_string.split('@')
+    except ValueError:
+        raise forms.ValidationError('Invalid format')
+
+    if hostname != settings.FEDERATION_HOSTNAME:
+        raise forms.ValidationError('Invalid hostname')
+
+    if username != 'service':
+        raise forms.ValidationError('Invalid username')
+
+    return username, hostname
+
+
+def serialize_system_acct():
+    return {
+        'subject': 'acct:service@{}'.format(settings.FEDERATION_HOSTNAME),
+        'aliases': [
+            utils.full_url(reverse('federation:instance-actor'))
+        ],
+        'links': [
+            {
+                'rel': 'self',
+                'type': 'application/activity+json',
+                'href': utils.full_url(reverse('federation:instance-actor')),
+            }
+        ]
+    }