index.php

<?php
/**
 * This file is part of CDNThumbnailer.
 * For the full copyright and license information, please view the LICENCE
 * file that was distributed with this source code.
 *
 * @license See the LICENCE file distributed with the source code
 * @author Stephane HULARD <s.hulard@chstudio.fr>
 * @package Default
 */

if( !isset($_GET['path']) || !isset($_GET['format']) ) {
	header($_SERVER['SERVER_PROTOCOL'].' 400 Bad request', true, 400);
	exit();
}

//Require configuration
require_once dirname(__FILE__).'/config/config.inc.php';

//File path to be resized
$sPath = $_GET['path'];
//Image url scheme if image is an external one
$sScheme = isset($_GET['scheme'])?$_GET['scheme']:null;

//If there are GET parameters in the picture URL, just add it to the path
$query = array_diff_key($_GET, array_flip(array('path', 'format', 'scheme')));
if( count($query) > 0 ) {
	$sPath .= '?'.http_build_query($query);
}

$sCache = realpath(CACHE_FOLDER).(isset($sScheme)?'/'.$sScheme.'/':"");
//Cleanup invalid characters from the path
$sCleanedPath = str_replace(array('?','=','&',':'), array('_','_','_','_'), $sPath);

//Define folder structure original contains base files and format folder are in the cache
$sOriginalFile = $sCache.'original/'.$sCleanedPath;
$sOriginalDir = dirname($sOriginalFile);

$sResizedFile = $sCache.$_GET['format'].'/'.$sCleanedPath;
$sResizedDir = dirname($sResizedFile);

//If the original file does not exists
if( !is_file($sOriginalFile) ) {
	//If the scheme is defined we try to download image
	if( !is_null($sScheme) ) {
		//Initialize curl handler and make the request
		$oRequest = curl_init($sScheme.'://'.str_replace(' ', '%20', $sPath));
		//Pretend to be a desktop browser
		curl_setopt($oRequest, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36');
		//Try and cope with some HTTPS servers
		curl_setopt($oRequest, CURLOPT_SSL_VERIFYPEER, FALSE);
		curl_setopt($oRequest, CURLOPT_SSL_VERIFYHOST, 2);
		curl_setopt($oRequest, CURLOPT_SSL_CIPHER_LIST, 'TLSv1');
		//Follow redirects
		curl_setopt($oRequest, CURLOPT_FOLLOWLOCATION, true);
		ob_start();
		curl_exec($oRequest);
		$sContent = ob_get_clean();

		//Retrieve last request details
		$aCurlInfo = curl_getinfo($oRequest);
		//If last request is a "200 OK", continue
		if( isset($aCurlInfo['http_code']) && $aCurlInfo['http_code'] == 200 ) {
			if( !is_dir($sOriginalDir) ) {
				$umask = umask(0);
				mkdir($sOriginalDir, 0777, true);
				umask($umask);
			}
			file_put_contents($sOriginalFile, $sContent);
		//Else, the file can't be retrieved so, send a 404 header
		} else {
			header($_SERVER['SERVER_PROTOCOL'].' 404 Not Found', true, 404);
			exit();
		}
		//Close curl handle
		curl_close($oRequest);
	//The scheme is not defined and original file is not here, file does not exists
	} else {
		header($_SERVER['SERVER_PROTOCOL'].' 404 Not Found', true, 404);
		exit();
	}
}

//If resized folder does not exists we add it
if( !is_dir($sResizedDir) ) {
	$umask = umask(0);
	mkdir($sResizedDir, 0777, true);
	umask($umask);
}

try
{
	require_once dirname(__FILE__).'/src/Image/ImageFactory.php';
	$oResized = ImageFactory::build($sOriginalFile);

	if( !is_file($sResizedFile) ) {
		//Resize on width constraint only
		if( strpos($_GET['format'], 'w') === 0 ) {
			$oResized->resize(substr($_GET['format'], 1));
		//Resize on height constraint only
		} elseif( strpos($_GET['format'], 'h') === 0 ) {
			$oResized->resize(null, substr($_GET['format'], 1));
		} elseif( strpos($_GET['format'], 'max') === 0 ) {
			if( $oResized->getWidth() > $oResized->getHeight() ) {
				$oResized->resize(substr($_GET['format'], 3));
			} else {
				$oResized->resize(null, substr($_GET['format'], 3));
			}
		//Resize and crop (11x11)
		} else {
			$aFormat = explode('x', $_GET['format']);
			//Use built Image manipulator to resize and save the new file
			$oResized->resizeAndCrop($aFormat[0], $aFormat[1]);
		}

		$oResized->save($sResizedFile);
	}

	//Build valid HTTP Headers for cache and content type/length for a correct navigator management
	$expires = 60*60*24*EXPIRE_DAYS;
	header($_SERVER['SERVER_PROTOCOL'].' 200 OK', true, 200);
//	header("Pragma: public");
	header("Cache-Control: maxage=".$expires);
	header('Expires: ' . gmdate('D, d M Y H:i:s', time()+$expires) . ' GMT');
	header('Last-Modified: '.gmdate('D, d M Y H:i:s', filemtime($sResizedFile)).' GMT');
	header('Content-Type: '.image_type_to_mime_type($oResized->getType()));
	header('Content-Length: '.filesize($sResizedFile));
	echo file_get_contents($sResizedFile);
	//Unset ImageFactory object to make sure resources are released
	unset($oResized);
}
//If errors are sent during resizing send HTTP 500 Errors
catch( ImagickException $oError )
{
	header($_SERVER['SERVER_PROTOCOL'].' 500 Internal Server Error', true, 500);
	echo $oError->getMessage();
}
catch( Exception $oError )
{
	header($_SERVER['SERVER_PROTOCOL'].' 500 Internal Server Error', true, 500);
	echo $oError->getMessage();
}