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<?php |
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namespace dokuwiki; |
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class AuthenticationToken { |
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/** @var int byte length of the token (non-user part) */ |
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const TOKENLENGTH = 32; |
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/** @var string path to the file */ |
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protected $file; |
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/** @var string the md5 of the user name */ |
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protected $md5; |
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/** @var string|null the user name */ |
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protected $user; |
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/** @var string|null the full token */ |
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protected $token; |
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/** |
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* AuthenticationToken constructor. |
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* |
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* @param string $md5 |
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* @param string|null $user |
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*/ |
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protected function __construct($md5, $user = null) { |
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global $conf; |
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$this->md5 = $md5; |
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$this->user = $user; |
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$this->file = $conf['metadir'] . '/_authtokens/' . $md5 . '.token'; |
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} |
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/** |
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* Create an instance from a given token |
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* |
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* @param string $token |
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* @return AuthenticationToken |
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*/ |
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static public function fromToken($token) { |
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list($md5) = explode('-', $token); |
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if(!preg_match('/^[a-zA-Z0-9]+$/', $md5)) $md5 = 'invalid'; |
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return new self($md5); |
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} |
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/** |
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* Create an instance from a given user name |
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* |
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* @param string $user |
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* @return AuthenticationToken |
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*/ |
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static public function fromUser($user) { |
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/** @var \DokuWiki_Auth_Plugin $auth */ |
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global $auth; |
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$md5 = md5($auth->cleanUser($user), true); |
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$md5 = self::tokenchars($md5); |
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return new self($md5, $user); |
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} |
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/** |
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* Check the user supplied token against the stored one |
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* |
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* @param string $token the user supplied token |
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* @return bool |
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*/ |
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public function check($token) { |
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$known = $this->getToken(); |
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if(!$known) return false; |
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return hash_equals($known, $token); |
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} |
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/** |
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* Reset the user's token |
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* |
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* @return string|false the new token if successful |
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*/ |
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public function reset() { |
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if($this->user === null) throw new \RuntimeException('No user initialized'); |
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$token = self::tokenchars(random_bytes(self::TOKENLENGTH)); |
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$token = $this->md5 . '-' . $token; |
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$content = $token . "\n" . $this->user; |
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if(io_saveFile($this->file, $content)) return $token; |
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return false; |
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} |
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/** |
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* Get the user's current token |
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* |
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* @return string|false the token, false if none is set |
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*/ |
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public function getToken() { |
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if($this->token === null && !$this->load()) return false; |
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return $this->token; |
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} |
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/** |
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* Get the user of this token |
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* |
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* @return bool|string |
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*/ |
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public function getUser() { |
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if($this->user === null && !$this->load()) return false; |
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return $this->user; |
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} |
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/** |
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* Removes the user's token |
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*/ |
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public function clear() { |
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@unlink($this->file); |
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} |
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/** |
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* Load the data |
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* |
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* @return bool successfully loaded |
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*/ |
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protected function load() { |
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if(!file_exists($this->file)) return false; |
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list($token, $user) = explode("\n", trim(io_readFile($this->file, false))); |
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$this->user = $user; |
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$this->token = $token; |
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return true; |
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} |
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/** |
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* Adjusted Base64 method |
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* |
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* @param string $bytes |
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* @return string |
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*/ |
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protected static function tokenchars($bytes) { |
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$chars = base64_encode($bytes); |
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$chars = str_replace(['+', '/', '='], ['X', 'Y', ''], $chars); |
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return $chars; |
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} |
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/** |
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* Generate an alphanumeric token of given length |
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* |
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* @param int $length |
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* @return string |
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*/ |
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protected function createToken($length = 30) { |
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$token = ''; |
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$codeAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
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$codeAlphabet .= "abcdefghijklmnopqrstuvwxyz"; |
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$codeAlphabet .= "0123456789"; |
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$max = strlen($codeAlphabet); |
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for($i = 0; $i < $length; $i++) { |
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$token .= $codeAlphabet[random_int(0, $max - 1)]; |
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} |
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return $token; |
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} |
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} |
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splitbrain /
dokuwiki
