shimmie2/ext/regen_thumb/main.php

<?php
/*
 * Name: Regen Thumb
 * Author: Shish <webmaster@shishnet.org>
 * Link: http://code.shishnet.org/shimmie2/
 * License: GPLv2
 * Description: Regenerate a thumbnail image
 * Documentation:
 *  This adds a button in the image control section on an
 *  image's view page, which allows an admin to regenerate
 *  an image's thumbnail; useful for instance if the first
 *  attempt failed due to lack of memory, and memory has
 *  since been increased.
 */

class RegenThumb extends Extension
{
    public function onPageRequest(PageRequestEvent $event)
    {
        global $database, $page, $user;

        if ($event->page_matches("regen_thumb/one") && $user->can("delete_image") && isset($_POST['image_id'])) {
            $image = Image::by_id(int_escape($_POST['image_id']));
            send_event(new ThumbnailGenerationEvent($image->hash, $image->ext, true));
            $database->cache->delete("thumb-block:{$image->id}");
            $this->theme->display_results($page, $image);
        }
        if ($event->page_matches("regen_thumb/mass") && $user->can("delete_image") && isset($_POST['tags'])) {
            $tags = Tag::explode(strtolower($_POST['tags']), false);
            $images = Image::find_images(0, 10000, $tags);

            foreach ($images as $image) {
                send_event(new ThumbnailGenerationEvent($image->hash, $image->ext, true));
                $database->cache->delete("thumb-block:{$image->id}");
            }

            $page->set_mode("redirect");
            $page->set_redirect(make_link("post/list"));
        }
    }

    public function onImageAdminBlockBuilding(ImageAdminBlockBuildingEvent $event)
    {
        global $user;
        if ($user->can("delete_image")) {
            $event->add_part($this->theme->get_buttons_html($event->image->id));
        }
    }

    public function onPostListBuilding(PostListBuildingEvent $event)
    {
        global $user;
        if ($user->can("delete_image") && !empty($event->search_terms)) {
            $event->add_control($this->theme->mtr_html(Tag::implode($event->search_terms)));
        }
    }
}