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，
islogin //判断是否登录setlogin //就是种个加密的cookiegetuidgetusername 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
1 php 2 class session_des 3 { 4 var $key; 5 var $iv; //偏移量 6 7 function session_des( $key=aaaaaaaa, $iv=bbbbbbbb) { 8 //key长度8例如:1234abcd 9 $this->key = $key;10 if( $iv == ) {11 $this->iv = $key; //默认以$key 作为 iv12 } else {13 $this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (mcrypt_des, mcrypt_mode_cbc), mcrypt_dev_random );14 }15 }16 17 function encrypt($str) {18 //加密，返回大写十六进制字符串19 $size = mcrypt_get_block_size ( mcrypt_des, mcrypt_mode_cbc );20 $str = $this->pkcs5pad ( $str, $size );21 return strtoupper( bin2hex( mcrypt_cbc(mcrypt_des, $this->key, $str, mcrypt_encrypt, $this->iv ) ) );22 }23 24 function decrypt($str) {25 //解密26 $strbin = $this->hex2bin( strtolower( $str ) );27 $str = mcrypt_cbc( mcrypt_des, $this->key, $strbin, mcrypt_decrypt, $this->iv );28 $str = $this->pkcs5unpad( $str );29 return $str;30 }31 32 function hex2bin($hexdata) {33 $bindata = ;34 for($i = 0; $i strlen ( $hexdata ); $i += 2) {35 $bindata .= chr ( hexdec ( substr ( $hexdata, $i, 2 ) ) );36 }37 return $bindata;38 }39 40 function pkcs5pad($text, $blocksize) {41 $pad = $blocksize - (strlen ( $text ) % $blocksize);42 return $text . str_repeat ( chr ( $pad ), $pad );43 }44 45 function pkcs5unpad($text) {46 $pad = ord ( $text {strlen ( $text ) - 1} );47 if ($pad > strlen ( $text ))48 return false;49 if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)50 return false;51 return substr ( $text, 0, - 1 * $pad );52 } 53 }
再来看session_user
1 php 2 define ('back_auth_name','xxxx'); //用到的cookie名 3 class session_user { 4 static $obj; 5 private $uid; 6 private $username; 7 private $chinesename; 8 public $auth_name = back_auth_name; 9 private $login_url = null; 10 public $domain = null; 11 12 private function __construct($login_url = null, $domain = null){ 13 $host = $_server[http_host]; 14 if (!$login_url) { 15 $this->login_url = http://{$host}/login; 16 } 17 else { 18 $this->login_url = $login_url; 19 } 20 21 if (!$domain) { 22 $domain = $_server[server_name]; 23 $this->domain = $domain; 24 } 25 26 if (empty ( $_cookie [$this->auth_name] )) { 27 return; 28 } 29 30 list ( $uid, $username, $ua, $tm, $chinesename ) = @$this->decodeauth ($_cookie [$this->auth_name]); 31 32 33 //ua检验 34 if (empty ( $uid ) || $ua !== md5($_server ['http_user_agent'])) { 35 return; 36 } 37 38 //todo:过期时间检验 39 40 $this->uid = $uid; 41 $this->username = $username; 42 $this->chinesename = $chinesename; 43 } 44 45 static public function instance($login_url = null, $domain = null){ 46 if(self::$obj) 47 return self::$obj; 48 else{ 49 self::$obj = new session_user($login_url, $domain); 50 } 51 return self::$obj; 52 } 53 54 55 /** 56 * 用户是否登陆 57 * */ 58 public function islogin(){ 59 if(! empty($this->uid)) 60 return true; 61 else 62 return false; 63 } 64 /** 65 * 66 * 跳转到登录页面 67 * @param unknown_type $forward 68 * @param unknown_type $exit 69 */ 70 public function requirelogin($forward = '', $exit = true){ 71 if(! $this->islogin()){ 72 if($forward === null) 73 { 74 header(location: . $this->login_url); 75 76 } 77 else 78 { 79 if(empty($forward)) 80 { 81 $forward = 'http://'.$_server['http_host'].$_server['request_uri']; 82 } 83 $forward = urlencode($forward); 84 header(location: . $this->login_url . ?forward=$forward); 85 } 86 if($exit) 87 exit; 88 } 89 } 90 /** 91 * 92 *设置登录状态 93 * @param unknown_type $uid 94 * @param unknown_type $username 95 * @param unknown_type $ua 96 * @param unknown_type $outtime 97 */ 98 99 public function setlogin($uid, $username, $ua = null,$outtime = null, $chinesename = null){100 if(empty($ua)){101 $ua = $_server['http_user_agent'];102 }103 104 $str = $this->encodeauth($uid, $username, $ua, $chinesename);105 setcookie($this->auth_name,urlencode($str),$outtime,'/',$this->domain);106 }107 /**108 * 用户退出109 */110 public function setlogout(){111 setcookie($this->auth_name,'',-1,'/',$this->domain);112 }113 114 public function __get($key){115 if('uid' == $key){116 return $this->uid;117 }elseif ('username' == $key) {118 return $this->username;119 }elseif ('chinesename' == $key) {120 return $this->chinesename;121 }122 return ;123 }124 125 public function getuid(){126 return $this->uid;127 } 128 129 public function getusername(){130 return $this->username;131 } 132 133 public function getchinesename(){134 return $this->chinesename;135 }136 137 /**138 * 生成加密的登陆cookie139 */140 private function encodeauth($uid,$username,$ua,$chinesename=null){141 $tm = time();142 $ua = md5($ua);143 $info = $uid\t$username\t$ua\t$tm\t$chinesename;144 $des = new session_des();145 $str = $des->encrypt($info);146 return $str;147 }148 149 /**150 * 解析加密cookie 151 */152 private function decodeauth($str){153 $des = new session_des();154 $info = explode(\t,@$des->decrypt($str));155 if(is_array($info)){156 return $info;157 }else{158 return array();159 }160 }161 162 public function auth($controller,$action)163 {164 if(!in_array($controller,$conarr)){165 return false;166 }167 if(!in_array($action,$actarr)){168 return false;169 }170 return true;171 }172 }
view code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