getthumb.php

<?php

use Xmf\Request;

/*
 * getthumb
 *
 * @copyright   Geekwright, LLC http://geekwright.com
 * @license GNU General Public License (GPL)
 * @since   1.0
 * @author  Richard Griffith richard@geekwright.com
 * @package gwiki
 *
 * Manage thumbnail cache. Expects gwiki_page_images keyword as page and
 * image_name as name, also optional maximal pixel dimension as size.
 *
 * Thumbnails are generated for requested size on use, and then served
 * from cache until source image is changed.
 *
 * Images which are smaller than requested size, or of an unsupported
 * format (currently only jpeg, png and gif are supported,) are served
 * as original source.
 *
 */

include __DIR__ . '/../../mainfile.php';
$xoopsLogger->activated = false;
// provide error logging for our sanity in debugging (won't see xoops logger)
restore_error_handler();
error_reporting(-1);

//$GLOBALS['xoopsOption']['template_main'] = 'gwiki_view.tpl';
//include XOOPS_ROOT_PATH."/header.php";

$dir = basename(__DIR__);
include_once XOOPS_ROOT_PATH . '/modules/' . $dir . '/class/GwikiPage.php';
$wikiPage = new GwikiPage;

$default_thumb_size = $wikiPage->defaultThumbSize;

global $xoopsDB;

/**
 * @param $msg
 */
function errorExit($msg)
{
    header('Status: 500 Internal Error - ' . $msg);
    echo $msg;
    exit;
}

/**
 * @param $string
 *
 * @return string
 */
function cleaner($string)
{
    $string = stripcslashes($string);
    $string = html_entity_decode($string);
    $string = strip_tags($string); // DANGER -- kills wiki text
    $string = trim($string);
    $string = stripslashes($string);

    return $string;
}

/**
 * @param      $name
 * @param      $mime
 * @param      $modtime
 * @param bool $nocache
 */
function serveFile($name, $mime, $modtime, $nocache = false)
{
    if (!$nocache && (getenv('HTTP_IF_MODIFIED_SINCE') === gmdate('D, d M Y H:i:s', $modtime) . ' GMT')) {
        header('HTTP/1.0 304 Not Modified');
        exit;
    }

    $fp = fopen($name, 'rb');

    header('Content-Type: ' . $mime);
    header('Content-Disposition: inline; filename=' . urlencode(basename($name)));
    header('Content-Length: ' . filesize($name));

    $seconds_to_cache = 3600;
    $ts               = gmdate('D, d M Y H:i:s', time() + $seconds_to_cache) . ' GMT';
    header("Expires: $ts");
    header('Pragma: cache');
    header("Cache-Control: max-age=$seconds_to_cache");
    header('last-modified: ' . gmdate('D, d M Y H:i:s', $modtime) . ' GMT');

    fpassthru($fp);
    fclose($fp);
    exit;
}

unset($page, $name, $size);
$page = Request::getString('page', '', 'get');
$name = Request::getString('name', '', 'get');
$size = Request::getInt('size', $default_thumb_size, 'get');

if (empty($page) || empty($name)) {
    errorExit('parameter missing');
}
if (empty($size) || $size === 0) {
    $size = $default_thumb_size;
}

$strategy           = 0;
$strategy_no_thumb  = 1; // no thumb possible or needed - pass original image
$strategy_old_thumb = 2; // send existing thumbnail image
$strategy_new_thumb = 3; // generate and pass new thumbnail

$image = $wikiPage->getPageImage($page, $name);
if (!$image) {
    errorExit('invalid parameters');
}

$file = $image['image_file'];
$i    = strrpos($file, '/');
if ($i === false) {
    errorExit('malformed path');
}
$file_pre  = substr($file, 0, $i);
$file_post = substr($file, $i);

$filename  = XOOPS_ROOT_PATH . '/uploads/' . $dir . '/' . $file;
$thumbpath = XOOPS_ROOT_PATH . '/uploads/' . $dir . '/' . $file_pre . '/' . $size;
$thumbname = $thumbpath . $file_post;
//echo $filename.'<br>'.$thumbpath.'<br>'.$thumbname;

$modtime = filemtime($filename);

if (file_exists($thumbname) && (filemtime($thumbname) > $modtime)) {
    $strategy   = $strategy_old_thumb;
    $info       = getimagesize($thumbname);
    $img_width  = $info[0];
    $img_height = $info[1];
    $img_mime   = $info['mime'];
} else { // (!file_exists($thumbname) || (file_exists($thumbname) && (filemtime($filename) > filemtime($thumbname))))
    $info       = getimagesize($filename);
    $img_width  = $info[0];
    $img_height = $info[1];
    $img_mime   = $info['mime'];

    if (($size >= $img_width) && ($size >= $img_height)) {
        $thumb_width  = $img_width;
        $thumb_height = $img_height;
        $strategy     = $strategy_no_thumb;
    } else {
        $ratio        = max($img_width, $img_height) / $size;
        $thumb_width  = ceil($img_width / $ratio);
        $thumb_height = ceil($img_height / $ratio);
        $strategy     = $strategy_new_thumb;
    }

    switch ($info[2]) {
        case IMAGETYPE_JPEG:
            $img_type = 'jpg';
            break;
        case IMAGETYPE_PNG:
            $img_type = 'png';
            break;
        case IMAGETYPE_GIF:
            $img_type = 'gif';
            break;
        default:
            $img_type = 'unsupported';
            $strategy = $strategy_no_thumb;
            break;
    }
    /*
        echo '<br>Image Width: '.$img_width;
        echo '<br>Image Height: '.$img_height;
        echo '<br>Type: '.$info[2].' '.$img_type.' '.$img_mime;

        echo '<br>Thumb Width: '.$thumb_width;
        echo '<br>Thumb Height: '.$thumb_height;
    */
}

switch ($strategy) {
    case $strategy_new_thumb:
        $oldUmask = umask(0);
        @mkdir($thumbpath, 0755, true);
        umask($oldUmask);
        $data = file_get_contents($filename);
        $im   = imagecreatefromstring($data);
        unset($data);
        $ti = imagecreatetruecolor($thumb_width, $thumb_height);
        imagealphablending($ti, false);
        imagesavealpha($ti, true);
        imagecopyresampled($ti, $im, 0, 0, 0, 0, $thumb_width, $thumb_height, $img_width, $img_height);
        imagedestroy($im);
        if ($img_type === 'jpg') {
            imagejpeg($ti, $thumbname, 80);
        }
        if ($img_type === 'png') {
            imagepng($ti, $thumbname);
        }
        if ($img_type === 'git') {
            imagegif($ti, $thumbname);
        }
        imagedestroy($ti);
        serveFile($thumbname, $img_mime, $modtime, true);
        break;
    case $strategy_old_thumb:
        serveFile($thumbname, $img_mime, $modtime);
        break;
    default:
        serveFile($filename, $img_mime, $modtime);
        break;
}

errorExit('unknown condition');
//include XOOPS_ROOT_PATH."/footer.php";