<?php

/**
 * @package tikiwiki
 */

// (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
//
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id$

// application to display an image from the database with
// option to resize the image dynamically creating a thumbnail on the fly.

// This handles 4 types of images, depending on the image_type parameter:
// "article": Images for articles
// "submission": Images for article submissions
// "topic": Images for topics associated to articles
// "preview": Special case used for article previews. A recently uploaded custom article image. Not cached nor generated here. See tiki-edit_article.php
// Any other value is invalid
// If image_type has no value, we default to "article" to preserve previous behaviour

require_once('tiki-setup.php');
use Tiki\Lib\Image\Image;

$artlib = TikiLib::lib('art');

$access->check_feature('feature_articles');

// Now check permissions to access this page
$access->check_permission_either(['tiki_p_read_article','tiki_p_articles_read_heading']);

if (! isset($_REQUEST["id"])) {
    die;
}
$useCache = isset($_REQUEST['cache']) && $_REQUEST['cache'] == 'y'; // cache only the image in list mode

// If image_type has no value, we default to "article" to preserve previous behaviour
if (! isset($_REQUEST["image_type"])) {
    $_REQUEST["image_type"] = "article";
}

switch ($_REQUEST["image_type"]) {
    case "article":
        $imagePrefix = "article";
        break;
    case "submission":
        $imagePrefix = "article_submission";
        break;
    case "topic":
        $imagePrefix = "article_topic";
        break;
    case "preview":
        $imagePrefix = "article_preview";
        break;
    default:
        die;
}
$temporaryFile = $prefs['tmpDir'];
if ($tikidomain) {
    $temporaryFile .= "/$tikidomain";
}
$temporaryFile .= "/$imagePrefix." . $_REQUEST["id"];


if ($imagePrefix == "article_preview" && ! is_file($temporaryFile)) {
    header("HTTP/1.1 404 Not Found");
} elseif ($imagePrefix != "article_preview" && (isset($_REQUEST["reload"]) || ! $useCache) || ! is_file($temporaryFile)) {
    // If "reload" parameter is set, recreate the cached image file from database values.

    switch ($_REQUEST["image_type"]) {
        case "article":
            $storedData = $artlib->get_article_image($_REQUEST["id"]);
            break;
        case "submission":
            $storedData = $artlib->get_submission($_REQUEST["id"]);
            break;
        case "topic":
            $storedData = $artlib->get_topic_image($_REQUEST["id"]);
            break;
        default:
            // Invalid value
            die;
    }
    // if blank then die, otherwise we offer to download strangeness
    // this also catches invalid id's
    if (! $storedData) {
        die;
    }
    $type = $storedData["image_type"];
    $data =& $storedData["image_data"];
    header("Content-type: " . $type);
    if (! empty($_REQUEST['width'])) {
        $image = Image::create($data);
        if ($image->getWidth() > $_REQUEST['width']) {
            $image->resize($_REQUEST['width'], 0);
            $data = $image->display();
        }
        if (empty($data)) {
            die;
        }
    }
    if ($useCache && $data) {
        $fp = fopen($temporaryFile, "wb");
        fputs($fp, $data);
        fclose($fp);
    }
    echo $data;
} else {
    $size = getimagesize($temporaryFile);
    header("Content-type: " . $size['mime']);
    readfile($temporaryFile);
}