shimmie2/ext/featured/main.php

<?php
/*
 * Name: Featured Image
 * Author: Shish <webmaster@shishnet.org>
 * Link: http://code.shishnet.org/shimmie2/
 * License: GPLv2
 * Description: Bring a specific image to the users' attentions
 * Documentation:
 *  Once enabled, a new "feature this" button will appear next
 *  to the other image control buttons (delete, rotate, etc).
 *  Clicking it will set the image as the site's current feature,
 *  which will be shown in the side bar of the post list.
 *  <p><b>Viewing a featured image</b>
 *  <br>Visit <code>/featured_image/view</code>
 *  <p><b>Downloading a featured image</b>
 *  <br>Link to <code>/featured_image/download</code>. This will give
 *  the raw data for an image (no HTML). This is useful so that you
 *  can set your desktop wallpaper to be the download URL, refreshed
 *  every couple of hours.
 */

class Featured extends Extension
{
    public function onInitExt(InitExtEvent $event)
    {
        global $config;
        $config->set_default_int('featured_id', 0);
    }

    public function onPageRequest(PageRequestEvent $event)
    {
        global $config, $page, $user;
        if ($event->page_matches("featured_image")) {
            if ($event->get_arg(0) == "set" && $user->check_auth_token()) {
                if ($user->can("edit_feature") && isset($_POST['image_id'])) {
                    $id = int_escape($_POST['image_id']);
                    if ($id > 0) {
                        $config->set_int("featured_id", $id);
                        log_info("featured", "Featured image set to $id", "Featured image set");
                        $page->set_mode(PageMode::REDIRECT);
                        $page->set_redirect(make_link("post/view/$id"));
                    }
                }
            }
            if ($event->get_arg(0) == "download") {
                $image = Image::by_id($config->get_int("featured_id"));
                if (!is_null($image)) {
                    $page->set_mode(PageMode::DATA);
                    $page->set_type($image->get_mime_type());
                    $page->set_data(file_get_contents($image->get_image_filename()));
                }
            }
            if ($event->get_arg(0) == "view") {
                $image = Image::by_id($config->get_int("featured_id"));
                if (!is_null($image)) {
                    send_event(new DisplayingImageEvent($image));
                }
            }
        }
    }

    public function onPostListBuilding(PostListBuildingEvent $event)
    {
        global $config, $database, $page, $user;
        $fid = $config->get_int("featured_id");
        if ($fid > 0) {
            $image = $database->cache->get("featured_image_object:$fid");
            if ($image === false) {
                $image = Image::by_id($fid);
                if ($image) { // make sure the object is fully populated before saving
                    $image->get_tag_array();
                }
                $database->cache->set("featured_image_object:$fid", $image, 600);
            }
            if (!is_null($image)) {
                if (ext_is_live("Ratings")) {
                    if (strpos(Ratings::get_user_privs($user), $image->rating) === false) {
                        return;
                    }
                }
                $this->theme->display_featured($page, $image);
            }
        }
    }

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