c2s posting

Problem/Motivation

So after reviewing what can be done with outbox service, and how can solve json:api issue #3300973 , something like this can be done for c2s posting implementation (very raw, and it needs DI and to do some activity type detection/negotiation:

 public function outbox(Request $request, UserInterface $user, ActivitypubActorInterface $activitypub_actor) {                                                                   
    $status = 400;                                                                                                                                                                
    $data = NULL;                                                                                                                                                                 
    $metadata = new CacheableMetadata();                                                                                                                                          
                                                                                                                                                                                  
    if ($request->getMethod() == 'POST' /*&& !empty($actor)*/) {                                                                                                                  
      // Add a way to get the note type related content type.                                                                                                                     
      $this->entityTypeManager()->getStorage('activitypub_type')->loadMultiple()['note'];                                                                                         
      if->getPlugin()['configuration'];                                                                                                                                           
      ['target_entity_type_id']                                                                                                                                                   
      ['target_bundle']*/                                                                                                                                                         
      $note_type = $this->entityTypeManager()->getStorage('activitypub_type')->loadMultiple()['note'];                                                                            
      if ($note_type) {                                                                                                                                                           
        $payload = json_decode((string)$request->getContent(), TRUE);                                                                                                             
        $type_configuration = $note_type->getPlugin()['configuration'];                                                                                                           
        $values = ['type' => $type_configuration['target_bundle']];                                                                                                               
        foreach($type_configuration['field_mapping'] as $mapping) {                                                                                                               
          if ($mapping['field_name'] && $payload['object'][$mapping['property']]) {                                                                                               
            $values[$mapping['field_name']] = $payload['object'][$mapping['property']];                                                                                           
          }                                                                                                                                                                       
        }                                                                                                                                                                         
        $created_entity = $this->entityTypeManager()->getStorage($type_configuration['target_entity_type_id'])->create($values);                                                  
        $created_entity->save();                                                                                                                                                  
        $outbox = \Drupal::service('activitypub.outbox');                                                                                                                         
        if (in_array(ActivityPubActivityInterface::PUBLIC_URL, $payload['to'])){                                                                                                  
          $visibility = ActivityPubActivityInterface::VISIBILITY_PUBLIC;                                                                                                          
        } elseif (in_array(ActivityPubActivityInterface::FOLLOWERS, $payload['to'])) {                                                                                            
          $visibility  = ActivityPubActivityInterface::VISIBILITY_FOLLOWERS;                                                                                                      
        } elseif (in_array(ActivityPubActivityInterface::VISIBILITY_UNLISTED, $payload['to'])) {                                                                                  
          $visibility = ActivityPubActivityInterface::VISIBILITY_UNLISTED;                                                                                                        
        } else {                                                                                                                                                                  
          $visibility = ActivityPubActivityInterface::VISIBILITY_PRIVATE;                                                                                                         
        }                                                                                                                                                                         
                                                                                                                                                                                  
        $outbox->createActivity($type_configuration['activity'], $created_entity, $activitypub_actor, $visibility, $payload['to'] ?? []);                                         
                                                                                                                                                                                  
      }                                                                                                                                                                           
    }                                                                                                                                                                             
    try {

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes