编写php拓展实例--slime项目（用户登录会话类）

 

最近公司换了yaf框架，突然对用c实现php拓展感兴趣了，如果一个功能已经很稳定很成熟而且用的地方很多，那么我们就可以尝试用拓展实现（不一定每种情况都可以写成拓展），写成拓展后就不用每次用都包含一下，工具类直接随php启动加载进内存里。

我这次是把用户会话加密类写成了php的拓展，用户类是基于des加密的，主要实现了，

1. isLogin //判断是否登录
2. setLogin //就是种个加密的cookie
3. getUid
4. getUsername

我给这个项目起名slime（史莱姆），勇者斗恶龙里的小怪，黏黏的。。。。。。

ok，先来看下php的实现，因为我们是php -> c,所以先看下php的实现，其实就是很普通用户类

 <?php
 class Session_DES
 {
     var $key;
     var $iv; //偏移量

     function Session_DES( $key="AAAAAAAA", $iv="BBBBBBBB") {
     //key长度8例如:1234abcd
         $this->key = $key;
         if( $iv == "" ) {
             $this->iv = $key; //默认以$key 作为 iv
         } else {
             $this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );
         }
     }

     function encrypt($str) {
     //加密，返回大写十六进制字符串
         $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
         $str = $this->pkcs5Pad ( $str, $size );
         return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );
     }

     function decrypt($str) {
     //解密
         $strBin = $this->hex2bin( strtolower( $str ) );
         $str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );
         $str = $this->pkcs5Unpad( $str );
         return $str;
     }

     function hex2bin($hexData) {
         $binData = "";
         for($i = 0; $i < strlen ( $hexData ); $i += 2) {
             $binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) );
         }
         return $binData;
     }

     function pkcs5Pad($text, $blocksize) {
         $pad = $blocksize - (strlen ( $text ) % $blocksize);
         return $text . str_repeat ( chr ( $pad ), $pad );
     }

     function pkcs5Unpad($text) {
         $pad = ord ( $text {strlen ( $text ) - 1} );
         if ($pad > strlen ( $text ))
             return false;
         if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)
             return false;
         return substr ( $text, 0, - 1 * $pad );
     }
 }

再来看Session_User

 <?php
 define ('BACK_AUTH_NAME','xxxx'); //用到的cookie名
 class Session_User {
     static $obj;
     private $uid;
     private $username;
     private $chineseName;
     public $auth_name = BACK_AUTH_NAME;
     private $login_url = null;
     public $domain = null;

     private function  __construct($login_url = null, $domain = null){
         $host = $_SERVER["HTTP_HOST"];
         if (!$login_url) {
             $this->login_url = "http://{$host}/login";
         }
         else {
             $this->login_url = $login_url;
         }

         if (!$domain) {
             $domain = $_SERVER["SERVER_NAME"];
             $this->domain = $domain;
         }

         if (empty ( $_COOKIE [$this->auth_name] )) {
             return;
         }

         list ( $uid, $username, $ua, $tm, $chineseName ) = @$this->decodeAuth ($_COOKIE [$this->auth_name]);

         //ua检验
         if (empty ( $uid ) || $ua !== md5($_SERVER ['HTTP_USER_AGENT'])) {
             return;
         }

         //TODO:过期时间检验

         $this->uid = $uid;
         $this->username = $username;
         $this->chineseName = $chineseName;
     }

     static public function instance($login_url = null, $domain = null){
         if(self::$obj)
             return self::$obj;
         else{
             self::$obj = new Session_User($login_url, $domain);
         }
         return self::$obj;
     }

     /**
      * 用户是否登陆
      * */
     public function isLogin(){
         if(! empty($this->uid))
             return true;
         else
             return false;
     }
     /**
      *
      * 跳转到登录页面
      * @param unknown_type $forward
      * @param unknown_type $exit
      */
     public function requireLogin($forward = '', $exit = true){
         if(! $this->isLogin()){
             if($forward === null)
             {
                 header("location: " . $this->login_url);

             }
             else
             {
                 if(empty($forward))
                 {
                     $forward = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
                 }
                 $forward = urlencode($forward);
                 header("location: ". $this->login_url . "?forward=$forward");
             }
             if($exit)
                 exit;
         }
     }
     /**
      *
      *设置登录状态
      * @param unknown_type $uid
      * @param unknown_type $username
      * @param unknown_type $ua
      * @param unknown_type $outtime
      */

     public function setLogin($uid, $username, $ua = null,$outtime = null, $chineseName = null){
         if(empty($ua)){
             $ua = $_SERVER['HTTP_USER_AGENT'];
         }

         $str = $this->encodeAuth($uid, $username, $ua, $chineseName);
         setcookie($this->auth_name,urlencode($str),$outtime,'/',$this->domain);
     }
     /**
      * 用户退出
       */
     public function setLogout(){
         setcookie($this->auth_name,'',-1,'/',$this->domain);
     }

     public function __get($key){
         if('uid' == $key){
             return $this->uid;
         }elseif ('username' == $key) {
             return $this->username;
         }elseif ('chineseName' == $key) {
             return $this->chineseName;
         }
         return ;
     }

     public  function getUid(){
         return $this->uid;
     }    

     public function getUserName(){
         return $this->username;
     }    

     public function getChineseName(){
         return $this->chineseName;
     }

     /**
      * 生成加密的登陆cookie
      */
     private function  encodeAuth($uid,$username,$ua,$chineseName=null){
         $tm = time();
         $ua = md5($ua);
         $info = "$uid\t$username\t$ua\t$tm\t$chineseName";
         $des = new Session_DES();
         $str = $des->encrypt($info);
         return $str;
     }

     /**
      * 解析加密cookie
      */
     private function decodeAuth($str){
         $des = new Session_DES();
         $info = explode("\t",@$des->decrypt($str));
         if(is_array($info)){
             return $info;
         }else{
             return array();
         }
     }

     public function auth($controller,$action)
     {
         if(!in_array($controller,$conArr)){
             return false;
         }
         if(!in_array($action,$actArr)){
             return false;
         }
         return true;
     }
 }

结合上面两段代码，分离出来其实得到的会话类（常常做的就是把一样的的跟不一样的分离出来），只需要3个变量两个是des用到的iv偏移量，key加密秘钥，跟cookie名，然后我们就可以写我们的拓展了，其中踩到了很多坑，一些makefile，config.w4等小语法，lib依赖，总之还是学到了很多

代码地址：https://github.com/lietdai/ldclass