Resolve "Per-user libraries" (use !368 instead)

api/funkwhale_api/federation/utils.py

@@ -2,6 +2,10 @@ import unicodedata
 import re
 from django.conf import settings
 
+from funkwhale_api.common import session
+
+from . import signing
+
 
 def full_url(path):
     """
@@ -52,3 +56,35 @@ def slugify_username(username):
     )
     value = re.sub(r"[^\w\s-]", "", value).strip()
     return re.sub(r"[-\s]+", "_", value)
+
+
+def retrieve(fid, actor=None, serializer_class=None, queryset=None):
+    if queryset:
+        try:
+            # queryset can also be a Model class
+            existing = queryset.filter(fid=fid).first()
+        except AttributeError:
+            existing = queryset.objects.filter(fid=fid).first()
+        if existing:
+            return existing
+
+    auth = (
+        None if not actor else signing.get_auth(actor.private_key, actor.private_key_id)
+    )
+    response = session.get_session().get(
+        fid,
+        auth=auth,
+        timeout=5,
+        verify=settings.EXTERNAL_REQUESTS_VERIFY_SSL,
+        headers={
+            "Accept": "application/activity+json",
+            "Content-Type": "application/activity+json",
+        },
+    )
+    response.raise_for_status()
+    data = response.json()
+    if not serializer_class:
+        return data
+    serializer = serializer_class(data=data)
+    serializer.is_valid(raise_exception=True)
+    return serializer.save()