From: Matthias Schmidt <gravatronics@live.com>
Date: Mon, 3 Aug 2015 18:36:46 +0000 (+0200)
Subject: Save state
X-Git-Tag: 2.1.7~38
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=545165e312a4391d36f6075edfe9fc4f43f55fac;p=GitHub%2FWoltLab%2FWCF.git

Save state
---

diff --git a/wcfsetup/install/files/lib/action/ImageProxyAction.class.php b/wcfsetup/install/files/lib/action/ImageProxyAction.class.php
new file mode 100644
index 0000000000..f2d5e0a0e6
--- /dev/null
+++ b/wcfsetup/install/files/lib/action/ImageProxyAction.class.php
@@ -0,0 +1,90 @@
+<?php
+namespace wcf\action;
+use wcf\system\exception\IllegalLinkException;
+use wcf\system\exception\SystemException;
+use wcf\util\FileUtil;
+use wcf\util\HTTPRequest;
+use wcf\util\StringUtil;
+
+/**
+ * Caches external images locally.
+ * 
+ * @author	Matthias Schmidt
+ * @copyright	2001-2015 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	com.woltlab.wcf
+ * @subpackage	action
+ * @category	Community Framework
+ */
+class ImageProxyAction extends AbstractAction {
+	/**
+	 * hashed image proxy secret and image url
+	 * @var	string
+	 */
+	public $hash = '';
+	
+	/**
+	 * url-encoded image url
+	 * @var	string
+	 */
+	public $url = '';
+	
+	/**
+	 * @see	\wcf\action\IAction::readParameters()
+	 */
+	public function readParameters() {
+		parent::readParameters();
+		
+		if (isset($_REQUEST['url'])) $this->url = StringUtil::trim($_REQUEST['url']);
+		if (isset($_REQUEST['hash'])) $this->hash = StringUtil::trim($_REQUEST['hash']);
+	}
+	
+	/**
+	 * @see	\wcf\action\IAction::execute()
+	 */
+	public function execute() {
+		parent::execute();
+		
+		$url = urldecode($this->url);
+		$hash = sha1(IMAGE_PROXY_SECRET.$url);
+		if ($this->hash != $hash) {
+			throw new IllegalLinkException();
+		}
+		
+		try {
+			$request = new HTTPRequest($url);
+			$request->execute();
+			$reply = $request->getReply();
+			
+			$fileExtension = '';
+			if (($position = mb_strrpos($url, '.')) !== false) {
+				$fileExtension = mb_strtolower(mb_substr($url, $position + 1));
+			}
+			
+			// check if requested content is image
+			if (!isset($reply['headers']['Content-Type']) || !StringUtil::startsWith($reply['headers']['Content-Type'], 'image/')) {
+				throw new IllegalLinkException();
+			}
+			
+			// save image
+			$fileLocation = WCF_DIR.'images/proxy/'.substr($hash, 0, 2).'/'.$hash.($fileExtension ? '.'.$fileExtension : '');
+			$dir = dirname($fileLocation);
+			if (!@file_exists($dir)) {
+				FileUtil::makePath($dir, 0777);
+			}
+			file_put_contents($fileLocation, $reply['body']);
+			
+			// update mtime for correct expiration calculation
+			@touch($fileLocation);
+			
+			$this->executed();
+			
+			@header('Content-Type: '.$reply['headers']['Content-Type']);
+			@readfile($fileLocation);
+			exit;
+		}
+		catch (SystemException $e) {
+			throw new IllegalLinkException();
+		}
+	}
+}