refactor Move for more redundancy

As outlined in #3354, a use `Move` fails if the user is moving from a BookWyrm server to another BookWrym server.
This is because:

1. the original code did not announce changes to alsoKnownAs;
2. the original code always checked the locally saved profile rather than refetching the remote data;

This commit fixes both these problems by forcing `MoveUser` to always perform a "refresh" of the local data from the remote, and by saving the user with broadcast=True when updating alsoKnownAs ids.

bookwyrm/views/helpers.py

@@ -60,7 +60,7 @@ def is_bookwyrm_request(request):
     return True
 
 
-def handle_remote_webfinger(query, unknown_only=False):
+def handle_remote_webfinger(query, unknown_only=False, refresh=False):
     """webfingerin' other servers"""
     user = None
 
@@ -75,6 +75,11 @@ def handle_remote_webfinger(query, unknown_only=False):
         return None
 
     try:
+
+        if refresh:
+            # Always fetch the remote info - don't even bother checking the DB
+            raise models.User.DoesNotExist("remote_only is set to True")
+
         user = models.User.objects.get(username__iexact=query)
 
         if unknown_only:
@@ -92,7 +97,7 @@ def handle_remote_webfinger(query, unknown_only=False):
             if link.get("rel") == "self":
                 try:
                     user = activitypub.resolve_remote_id(
-                        link["href"], model=models.User
+                        link["href"], model=models.User, refresh=refresh
                     )
                 except (KeyError, activitypub.ActivitySerializerError):
                     return None

bookwyrm/views/preferences/move_user.py

@@ -32,7 +32,7 @@ class MoveUser(View):
 
         if form.is_valid() and user.check_password(form.cleaned_data["password"]):
             username = form.cleaned_data["target"]
-            target = handle_remote_webfinger(username)
+            target = handle_remote_webfinger(username, refresh=True)
 
             try:
                 models.MoveUser.objects.create(
@@ -81,6 +81,7 @@ class AliasUser(View):
                 return TemplateResponse(request, "preferences/alias_user.html", data)
 
             user.also_known_as.add(remote_user.id)
+            user.save(broadcast=True)  # broadcast the alias
 
             return redirect("prefs-alias")