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<?php
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/*
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* Flashii PBKDF2 Password Hashing
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*
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* Based on Password Hashing With PBKDF2 (https://defuse.ca/php-pbkdf2.htm).
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* Copyright (c) 2013, Taylor Hornby
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Flashii;
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class Hashing {
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// These variables can be changed without break the existing hashes
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private static $_PBKDF2_HASH_ALGORITHM = 'sha256';
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private static $_PBKDF2_ITERATIONS = 1000;
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private static $_PBKDF2_SALT_BYTES = 24;
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private static $_PBKDF2_HASH_BYTES = 24;
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// Changing these will break it though
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private static $_HASH_ALGORITHM_INDEX = 0;
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private static $_HASH_ITERATION_INDEX = 1;
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private static $_HASH_SALT_INDEX = 2;
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private static $_HASH_PBKDF2_INDEX = 3;
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private static $_HASH_SECTIONS = 4;
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// Returns an array formatted like: [algorithm, iterations, salt, hash]
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public static function create_hash($pass) {
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$salt = base64_encode(
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\mcrypt_create_iv(
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self::$_PBKDF2_SALT_BYTES,
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MCRYPT_DEV_URANDOM
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)
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);
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$hash = base64_encode(
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self::pbkdf2(
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self::$_PBKDF2_HASH_ALGORITHM,
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$pass,
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$salt,
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self::$_PBKDF2_ITERATIONS,
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self::$_PBKDF2_HASH_BYTES,
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true
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)
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);
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$passwordData = array(
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self::$_PBKDF2_HASH_ALGORITHM,
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self::$_PBKDF2_ITERATIONS,
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$salt,
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$hash
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);
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return $passwordData;
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}
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// Validates hashed password
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public static function validate_password($password, $params) {
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if(count($params) < self::$_HASH_SECTIONS);
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return false;
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$pbkdf2 = base64_decode($params[self::$_HASH_PBKDF2_INDEX]);
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$validate = self::slow_equals(
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$pbkdf2,
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self::pbkdf2(
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$params[self::$_HASH_ALGORITHM_INDEX],
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$password,
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$params[self::$_HASH_SALT_INDEX],
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(int)$params[self::$_HASH_ITERATION_INDEX],
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strlen($pbkdf2),
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true
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)
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);
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return $validate;
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}
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// Compares two strings $a and $b in length-constant time.
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public static function slow_equals($a, $b) {
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$diff = strlen($a) ^ strlen($b);
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for($i = 0; $i < strlen($a) && $i < strlen($b); $i++) {
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$diff |= ord($a[$i]) ^ ord($b[$i]);
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}
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return $diff === 0;
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}
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/*
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* PBKDF2 key derivation function as defined by RSA's PKCS #5: https://www.ietf.org/rfc/rfc2898.txt
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* $algorithm - The hash algorithm to use. Recommended: SHA256
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* $password - The password.
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* $salt - A salt that is unique to the password.
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* $count - Iteration count. Higher is better, but slower. Recommended: At least 1000.
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* $key_length - The length of the derived key in bytes.
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* $raw_output - If true, the key is returned in raw binary format. Hex encoded otherwise.
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* Returns: A $key_length-byte key derived from the password and salt.
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*
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* Test vectors can be found here: https://www.ietf.org/rfc/rfc6070.txt
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*
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* This implementation of PBKDF2 was originally created by https://defuse.ca
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* With improvements by http://www.variations-of-shadow.com
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*/
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private static function pbkdf2($algorithm, $password, $salt, $count, $key_length, $raw_output = false) {
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$algorithm = strtolower($algorithm);
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if(!in_array($algorithm, hash_algos(), true))
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trigger_error('PBKDF2 ERROR: Invalid hash algorithm.', E_USER_ERROR);
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if($count <= 0 || $key_length <= 0)
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trigger_error('PBKDF2 ERROR: Invalid parameters.', E_USER_ERROR);
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if(function_exists('hash_pbkdf2')) {
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// The output length is in NIBBLES (4-bits) if $raw_output is false!
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if($raw_output)
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$key_length = $key_length * 2;
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return hash_pbkdf2($algorithm, $password, $salt, $count, $key_length, $raw_output);
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}
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$hash_length = strlen(hash($algorithm, '', true));
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$block_count = ceil($key_length / $hash_length);
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$output = '';
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for($i = 1; $i <= $block_count; $i++) {
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// $i encoded as 4 bytes, big endian.
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$last = $salt . pack('N', $i);
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// First iteration
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$last = $xorsum = hash_hmac($algorithm, $last, $password, true);
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// Perform the other $count - 1 interations
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for($j = 1; $j < $count; $j++) {
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$xorsum ^= ($last = hash_hmac($algorithm, $last, $password, true));
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}
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$output .= $xorsum;
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if($raw_output)
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return substr($output, 0, $key_length);
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else
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return bin2hex(substr($output, 0, $key_length));
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}
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}
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}
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<?php
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/*
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* Main Class
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*/
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namespace Flashii;
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class Flashii {
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public static $_CONF;
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public static $_DB;
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public $twig;
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// Constructor
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function __construct($config) {
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// Stop the execution if the PHP Version is older than 5.4.0
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if(version_compare(phpversion(), '5.4.0', '<'))
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die('<h3>Upgrade your PHP Version to at least PHP 5.4!</h3>');
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// Assign $config values to $_CONF
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self::$_CONF = $config;
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// Initialise database
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self::$_DB = new Database();
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}
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// Get values from the configuration
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public static function getConfig($key, $subkey = null) {
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if(array_key_exists($key, self::$_CONF)) {
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if($subkey)
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return self::$_CONF[$key][$subkey];
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else
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return self::$_CONF[$key];
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} else {
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return false;
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}
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}
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// Initialise Twig
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public function initTwig($templateName = null, $templatesFolder = null) {
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// Assign default values set in the configuration if $templateName and $templatesFolder are null
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$templateName = is_null($templateName) ? self::getConfig('etc', 'design') : $templateName;
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$templatesFolder = is_null($templatesFolder) ? self::getConfig('etc', 'templatesPath') : $templatesFolder;
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// Initialise Twig Filesystem Loader
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$twigLoader = new \Twig_Loader_Filesystem($templatesFolder . $templateName);
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// And now actually initialise the templating engine
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$this->twig = new \Twig_Environment($twigLoader, array(
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// 'cache' => $satoko['cacheFolder']
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));
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}
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// Error Handler
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public static function ErrorHandler($errno, $errstr, $errfile, $errline) {
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// Set some variables to work with including A HUGE fallback hackjob for the templates folder
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$errstr = str_replace(self::getConfig('etc', 'localPath'), '', $errstr);
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$errfile = str_replace(self::getConfig('etc', 'localPath'), '', $errfile);
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$templates = (self::getConfig('etc', 'templatesPath') !== null && !empty(self::getConfig('etc', 'templatesPath'))) ? self::getConfig('etc', 'templatesPath') : '/var/www/flashii.net/_sakuya/templates/';
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switch ($errno) {
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case E_ERROR:
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case E_USER_ERROR:
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$error = '<b>FATAL ERROR</b>: ' . $errstr . ' on line ' . $errline . ' in ' . $errfile;
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break;
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case E_WARNING:
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case E_USER_WARNING:
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$error = '<b>WARNING</b>: ' . $errstr . ' on line ' . $errline . ' in ' . $errfile;
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break;
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case E_NOTICE:
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case E_USER_NOTICE:
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$error = '<b>NOTICE</b>: ' . $errstr . ' on line ' . $errline . ' in ' . $errfile;
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break;
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default:
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$error = '<b>Unknown error type</b> [' . $errno . ']: ' . $errstr . ' on line ' . $errline . ' in ' . $errfile;
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break;
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}
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// Use file_get_contents instead of Twig in case the problem is related to twig
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$errorPage = file_get_contents($templates. 'errorPage.tpl');
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// str_replace {{ error }} on the error page with the error data
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$error = str_replace('{{ error }}', $error, $errorPage);
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// Truncate all previous outputs
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ob_clean();
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// Die and display error message
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die($error);
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}
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// Legacy password hashing to be able to validate passwords from users on the old backend.
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public static function legacyPasswordHash($data) {
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return hash('sha512', strrev(hash('sha512', $data)));
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}
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}
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