MoveIconsOnOwnerChangeHandler.php

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<?php

namespace Elgg\Icons;

class MoveIconsOnOwnerChangeHandler {
    
    public function __invoke(\Elgg\Event $event) {
        $entity = $event->getObject();
        if (!$entity instanceof \ElggEntity) {
            return;
        }
        
        $original_attributes = $entity->getOriginalAttributes();
        if (empty($original_attributes['owner_guid'])) {
            return;
        }
    
        $previous_owner_guid = $original_attributes['owner_guid'];
        $new_owner_guid = $entity->owner_guid;
    
        $sizes = array_keys(elgg_get_icon_sizes($entity->getType(), $entity->getSubtype()));
        foreach ($sizes as $size) {
            // using the Icon Service because we don't want to auto generate the 'new' icon
            $new_icon = _elgg_services()->iconService->getIcon($entity, $size, 'icon', false);
            if ($new_icon->owner_guid == $entity->guid) {
                // we do not need to update icons that are owned by the entity itself
                continue;
            }
    
            if ($new_icon->owner_guid != $new_owner_guid) {
                // a plugin implements some custom logic
                continue;
            }
    
            $old_icon = new \ElggIcon();
            $old_icon->owner_guid = $previous_owner_guid;
            $old_icon->setFilename($new_icon->getFilename());
            if (!$old_icon->exists()) {
                // there is no icon to move
                continue;
            }
    
            if ($new_icon->exists()) {
                // there is already a new icon
                // just removing the old one
                $old_icon->delete();
                elgg_log("Entity $entity->guid has been transferred to a new owner but an icon was "
                    . "left behind under {$old_icon->getFilenameOnFilestore()}. "
                    . "Old icon has been deleted", 'NOTICE');
                continue;
            }
    
            $old_icon->transfer($new_icon->owner_guid, $new_icon->getFilename());
            elgg_log("Entity $entity->guid has been transferred to a new owner. "
                . "Icon was moved from {$old_icon->getFilenameOnFilestore()} to {$new_icon->getFilenameOnFilestore()}.", 'NOTICE');
        }
    }
}