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+<?php
+/*
+This software is licensed through a BSD-style License.
+http://www.opensource.org/licenses/bsd-license.php
+
+Copyright (c) 2009 Alexander Sulfrian
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+Neither the name of Jacob D. Cohen nor the names of his contributors
+may be used to endorse or promote products derived from this software
+without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+abstract class StorageEngine
+{
+ abstract public function setContent($content);
+
+ public function generateToken($name)
+ {
+ global $config;
+
+ $ipAddr = $_SERVER["REMOTE_ADDR"];
+ return sha1($name . $ipAddr . $config['token_salt']);
+ }
+
+ public function prepareContent($name, $baseUrl, $content)
+ {
+ $content = preg_replace("/=\{this-paste-url\}/",
+ $baseUrl . '/' . $name, $content);
+
+ $content = preg_replace("/=\{remove-paste-url\}/", $baseUrl
+ . '/' . 'remove.php?id=' . $name
+ . '&t=' . $this->generateToken(),
+ $content);
+
+ return $content;
+ }
+}
+
+?>