RegisterFields.php

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<?php
 
namespace Elgg\Forms;
 
class RegisterFields {
    
    public static function addEntityGUID(\Elgg\Event $event): ?array {
        $entity = $event->getEntityParam();
        if (!$entity instanceof \ElggEntity) {
            return null;
        }
        
        $fields = $event->getValue();
        
        $fields[] = [
            '#type' => 'hidden',
            'name' => 'guid',
            'value' => $entity->guid,
        ];
        
        return $fields;
    }
    
    public static function addEntityToAccessInput(\Elgg\Event $event): ?array {
        $entity = $event->getEntityParam();
        if (!$entity instanceof \ElggEntity) {
            return null;
        }
        
        $fields = $event->getValue();
        foreach ($fields as $index => $field) {
            if (elgg_extract('#type', $field) !== 'access') {
                continue;
            }
            
            $fields[$index]['entity'] = $entity;
        }
        
        return $fields;
    }
    
    public static function addContainerInput(\Elgg\Event $event): ?array {
        $entity_type = $event->getParam('entity_type');
        $entity_subtype = $event->getParam('entity_subtype');
        if (empty($entity_type) || empty($entity_subtype)) {
            return null;
        }
        
        $fields = $event->getValue();
        $fields[] = [
            '#type' => 'container_guid',
            'name' => 'container_guid',
            'entity_type' => $entity_type,
            'entity_subtype' => $entity_subtype,
        ];
        
        return $fields;
    }
}