shimmie2/ext/view/main.php

<?php
/*
 * Name: Image Viewer
 * Author: Shish
 * Description: Allows users to see uploaded images
 */

/*
 * DisplayingImageEvent:
 *   $image -- the image being displayed
 *   $page  -- the page to display on
 *
 * Sent when an image is ready to display. Extensions who
 * wish to appear on the "view" page should listen for this,
 * which only appears when an image actually exists.
 */

require_once "events/displaying_image_event.php";
require_once "events/image_info_box_building_event.php";
require_once "events/image_info_set_event.php";
require_once "events/image_admin_block_building_event.php";


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

        if ($event->page_matches("post/prev") ||	$event->page_matches("post/next")) {
            $image_id = int_escape($event->get_arg(0));

            if (isset($_GET['search'])) {
                $search_terms = explode(' ', $_GET['search']);
                $query = "#search=".url_escape($_GET['search']);
            } else {
                $search_terms = [];
                $query = null;
            }

            $image = Image::by_id($image_id);
            if (is_null($image)) {
                $this->theme->display_error(404, "Image not found", "Image $image_id could not be found");
                return;
            }

            if ($event->page_matches("post/next")) {
                $image = $image->get_next($search_terms);
            } else {
                $image = $image->get_prev($search_terms);
            }

            if (is_null($image)) {
                $this->theme->display_error(404, "Image not found", "No more images");
                return;
            }

            $page->set_mode(PageMode::REDIRECT);
            $page->set_redirect(make_link("post/view/{$image->id}", $query));
        } elseif ($event->page_matches("post/view")) {
            if (!is_numeric($event->get_arg(0))) {
                // For some reason there exists some very broken mobile client
                // who follows up every request to '/post/view/123' with
                // '/post/view/12300000000000Image 123: tags' which spams the
                // database log with 'integer out of range'
                $this->theme->display_error(404, "Image not found", "Invalid image ID");
                return;
            }

            $image_id = int_escape($event->get_arg(0));

            $image = Image::by_id($image_id);

            if (!is_null($image)) {
                $die = new DisplayingImageEvent($image);
                send_event($die);
                $page->set_title(html_escape($die->title));
                $iabbe = new ImageAdminBlockBuildingEvent($image, $user);
                send_event($iabbe);
                ksort($iabbe->parts);
                $this->theme->display_admin_block($page, $iabbe->parts);
            } else {
                $this->theme->display_error(404, "Image not found", "No image in the database has the ID #$image_id");
            }
        } elseif ($event->page_matches("post/set")) {
            if (!isset($_POST['image_id'])) {
                return;
            }

            $image_id = int_escape($_POST['image_id']);

            send_event(new ImageInfoSetEvent(Image::by_id($image_id)));

            $page->set_mode(PageMode::REDIRECT);
            $page->set_redirect(make_link("post/view/$image_id", url_escape(@$_POST['query'])));
        }
    }

    public function onDisplayingImage(DisplayingImageEvent $event)
    {
        global $user;
        $iibbe = new ImageInfoBoxBuildingEvent($event->get_image(), $user);
        send_event($iibbe);
        ksort($iibbe->parts);
        $this->theme->display_meta_headers($event->get_image());

        $event->title = "Image {$event->get_image()->id}: ".$event->get_image()->get_tag_list();

        $this->theme->display_page($event->get_image(), $iibbe->parts);
    }
}