[ActivityPub] Fix some small known problems

ActivityPubPlugin:
- Rework onProfileDeleteRelated to account for the tables _rsa and _pending_follow_requests
- Update onEndShowAccountProfileBlock to stop creating the ap_profile if it doesn't exist (we'll handle this in a different manner)

Activitypub_profile:
- Remove unnecessary code from from_profile method and add return type information

Explorer:
- Update travel_collection to call itself instead of _lookup, that was wrong

plugins/ActivityPub/ActivityPubPlugin.php

@@ -345,18 +345,17 @@ class ActivityPubPlugin extends Plugin
      */
     public function onProfileDeleteRelated(Profile $profile, array &$related): void
     {
-        if ($profile->isLocal()) {
-            return;
-        }
-
-        try {
-            $aprofile = Activitypub_profile::getKV('profile_id', $profile->getID());
-            if ($aprofile instanceof Activitypub_profile) {
-                // mark for deletion
         $related[] = 'Activitypub_profile';
+        $related[] = 'Activitypub_rsa';
+
+        // pending_follow_requests doesn't have a profile_id column,
+        // so we must handle it manually
+        $follow = new Activitypub_pending_follow_requests(null, $profile->getID());
+
+        if ($follow->find()) {
+            while ($follow->fetch()) {
+                $follow->delete();
             }
-        } catch (Exception $e) {
-            // nothing to do
         }
     }
 
@@ -386,9 +385,9 @@ class ActivityPubPlugin extends Plugin
         if ($profile->isLocal()) {
             return true;
         }
-        try {
-            Activitypub_profile::from_profile($profile);
-        } catch (Exception $e) {
+        
+        $aprofile = Activitypub_profile::getKV('profile_id', $profile->getID());
+        if (!$aprofile instanceof Activitypub_profile) {
             // Not a remote ActivityPub_profile! Maybe some other network
             // that has imported a non-local user (e.g.: OStatus)?
             return true;

plugins/ActivityPub/classes/Activitypub_profile.php

@@ -201,7 +201,7 @@ class Activitypub_profile extends Managed_DataObject
      * @throws Exception if no Activitypub_profile exists for given Profile
      * @author Diogo Cordeiro <diogo@fc.up.pt>
      */
-    public static function from_profile(Profile $profile)
+    public static function from_profile(Profile $profile): Activitypub_profile
     {
         $profile_id = $profile->getID();
 
@@ -216,8 +216,9 @@ class Activitypub_profile extends Managed_DataObject
             }
         }
 
+        // extend the ap_profile with some information we
+        // don't store in the database
         $fields = [
-            'uri' => 'profileurl',
             'nickname' => 'nickname',
             'fullname' => 'fullname',
             'bio' => 'bio'

plugins/ActivityPub/lib/explorer.php

@@ -450,7 +450,7 @@ class Activitypub_explorer
         }
         // Go through entire collection
         if (!is_null($res["next"])) {
-            $this->_lookup($res["next"]);
+            $this->travel_collection($res["next"]);
         }
 
         return true;