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thumbnail.php
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thumbnail.php
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<?php
/*
Stendhal website - a website to manage and ease playing of Stendhal game
Copyright (C) 2008 Miguel Angel Blanch Lardin
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
require_once 'configuration.php';
function open_image ($file) {
// Get extension
$extension = strrchr($file, '.');
$extension = strtolower($extension);
switch($extension) {
case '.jpg':
case '.jpeg':
$im = imagecreatefromjpeg($file);
break;
case '.gif':
$im = imagecreatefromgif($file);
break;
case '.png':
$im = imagecreatefrompng($file);
break;
default:
$im = false;
break;
}
return $im;
}
function createImage($url) {
// Load image
$image = open_image($url);
if ($image === false) {
die ('Unable to open image');
}
// Get original width and height
$width = imagesx($image);
$height = imagesy($image);
// New width and height
$new_width = 158;
$new_height = $height * ($new_width/$width);
// Resample
$image_resized = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
return $image_resized;
}
$url = $_GET['img'];
if ((strpos($url, '..') !== false) || (strpos($url, 'screenshots/') !== 0) || (strpos($url, '.') < strlen($url) - 4)) {
header('HTTP/1.1 404 Not Found', true, 404);
die("Access denied.");
}
$etag = STENDHAL_VERSION.'-'.sha1($url);
if (isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
$requestedEtag = $_SERVER['HTTP_IF_NONE_MATCH'];
}
header("Content-type: image/jpeg");
header("Cache-Control: max-age=3888000, public"); // 45 * 24 * 60 * 60
header('Pragma: cache');
header('Etag: "'.$etag.'"');
if (isset($requestedEtag) && (($requestedEtag == $etag) || ($requestedEtag == '"'.$etag.'"'))) {
header('HTTP/1.0 304 Not modified');
} else {
imagejpeg(createImage($url));
}