PHP开源系统学习之fluxbb_2

谴责下某位同学，转载了我的上一篇文章，也不给个原文地址，希望这次再来转时能加上。

//检查登录，在common.php判断

//cookie串： 2|dc4fab5bb354be5104bae0affe2c1b615c565cf5|1384165106|eb084e693bb241a29e9986b62e69cf5f465f354d

//cookie有效期大于当前时间=》继续判断：用户cookie中保存的用户ID、生存周期、及预设置的cookie密钥，经过特殊处理后与$cookie['cookie_hash']比较

 function check_cookie(&$pun_user)
 {
     global $db, $db_type, $pun_config, $cookie_name, $cookie_seed;

     $now = time();

     // If the cookie is set and it matches the correct pattern, then read the values from it
     if (isset($_COOKIE[$cookie_name]) && preg_match('%^(\d+)\|([0-9a-fA-F]+)\|(\d+)\|([0-9a-fA-F]+)$%', $_COOKIE[$cookie_name], $matches))
     {
         $cookie = array(
             'user_id'            => intval($matches[1]),
             'password_hash'     => $matches[2],
             'expiration_time'    => intval($matches[3]),
             'cookie_hash'        => $matches[4],
         );
     }

     // If it has a non-guest user, and hasn't expired
     if (isset($cookie) && $cookie['user_id'] > 1 && $cookie['expiration_time'] > $now)
     {
         // If the cookie has been tampered with
         if (forum_hmac($cookie['user_id'].'|'.$cookie['expiration_time'], $cookie_seed.'_cookie_hash') != $cookie['cookie_hash'])
         {
             $expire = $now + 31536000; // The cookie expires after a year
             pun_setcookie(1, pun_hash(uniqid(rand(), true)), $expire);
             set_default_user();

             return;
         }
 ...............

//从上面得到的$cookie变量中的user_id，去数据库查询取到密码，特殊处理后与$cookie中的password_hash比较

 // Check if there's a user with the user ID and password hash from the cookie
         $result = $db->query('SELECT u.*, g.*, o.logged, o.idle FROM '.$db->prefix.'users AS u INNER JOIN '.$db->prefix.'groups AS g ON u.group_id=g.g_id LEFT JOIN '.$db->prefix.'online AS o ON o.user_id=u.id WHERE u.id='.intval($cookie['user_id'])) or error('Unable to fetch user information', __FILE__, __LINE__, $db->error());
         $pun_user = $db->fetch_assoc($result);

         // If user authorisation failed
         if (!isset($pun_user['id']) || forum_hmac($pun_user['password'], $cookie_seed.'_password_hash') !== $cookie['password_hash'])
         {
             $expire = $now + 31536000; // The cookie expires after a year
             pun_setcookie(1, pun_hash(uniqid(rand(), true)), $expire);
             set_default_user();

             return;
         }

//退出 "login.php?action=out&id=2&csrf_token=40ce5abbaf76ba6fe66bb8a833eb9e8d4da5c273" ，此处没有直接删除cookie

//先判断用户是否已登录，链接是否有相应的标识

 if ($action == 'out')
 {
     if ($pun_user['is_guest'] || !isset($_GET['id']) || $_GET['id'] != $pun_user['id'] || !isset($_GET['csrf_token']) || $_GET['csrf_token'] != pun_hash($pun_user['id'].pun_hash(get_remote_address())))
     {
         header('Location: index.php');
         exit;
     }

     // Remove user from "users online" list
     $db->query('DELETE FROM '.$db->prefix.'online WHERE user_id='.$pun_user['id']) or error('Unable to delete from online list', __FILE__, __LINE__, $db->error());

     // Update last_visit (make sure there's something to update it with)
     if (isset($pun_user['logged']))
         $db->query('UPDATE '.$db->prefix.'users SET last_visit='.$pun_user['logged'].' WHERE id='.$pun_user['id']) or error('Unable to update user visit data', __FILE__, __LINE__, $db->error());

     pun_setcookie(1, pun_hash(uniqid(rand(), true)), time() + 31536000);

     redirect('index.php', $lang_login['Logout redirect']);
 }

//get_remote_address()取远程IP，区分了是否用了代理

 function get_remote_address()
 {
     $remote_addr = $_SERVER['REMOTE_ADDR'];

     // If we are behind a reverse proxy try to find the real users IP
     if (defined('FORUM_BEHIND_REVERSE_PROXY'))
     {
         if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
         {
             // The general format of the field is:
             // X-Forwarded-For: client1, proxy1, proxy2
             // where the value is a comma+space separated list of IP addresses, the left-most being the farthest downstream client,
             // and each successive proxy that passed the request adding the IP address where it received the request from.
             $forwarded_for = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
             $forwarded_for = trim($forwarded_for[0]);

             if (@preg_match('%^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$%', $forwarded_for) || @preg_match('%^((([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}:[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){5}:([0-9A-Fa-f]{1,4}:)?[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){4}:([0-9A-Fa-f]{1,4}:){0,2}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){3}:([0-9A-Fa-f]{1,4}:){0,3}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){2}:([0-9A-Fa-f]{1,4}:){0,4}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|(([0-9A-Fa-f]{1,4}:){0,5}:((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|(::([0-9A-Fa-f]{1,4}:){0,5}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|([0-9A-Fa-f]{1,4}::([0-9A-Fa-f]{1,4}:){0,5}[0-9A-Fa-f]{1,4})|(::([0-9A-Fa-f]{1,4}:){0,6}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){1,7}:))$%', $forwarded_for))
                 $remote_addr = $forwarded_for;
         }
     }

     return $remote_addr;
 }

//退出时cookie处理

 pun_setcookie(1, pun_hash(uniqid(rand(), true)), time() + 31536000);

 // Set a cookie, FluxBB style!
 // Wrapper for forum_setcookie
 //
 function pun_setcookie($user_id, $password_hash, $expire)
 {
     global $cookie_name, $cookie_seed;

     forum_setcookie($cookie_name, $user_id.'|'.forum_hmac($password_hash, $cookie_seed.'_password_hash').'|'.$expire.'|'.forum_hmac($user_id.'|'.$expire, $cookie_seed.'_cookie_hash'), $expire);
 }

 //
 // Set a cookie, FluxBB style!
 //
 function forum_setcookie($name, $value, $expire)
 {
     global $cookie_path, $cookie_domain, $cookie_secure, $pun_config;

     if ($expire - time() - $pun_config['o_timeout_visit'] < 1)
         $expire = 0;

     // Enable sending of a P3P header
     header('P3P: CP="CUR ADM"');

     if (version_compare(PHP_VERSION, '5.2.0', '>='))
         setcookie($name, $value, $expire, $cookie_path, $cookie_domain, $cookie_secure, true);
     else
         setcookie($name, $value, $expire, $cookie_path.'; HttpOnly', $cookie_domain, $cookie_secure);
 }

//定义一些通用函数，

如:error()：

error('Unable to fetch user info', __FILE__, __LINE__, $db->error())

message($message, $no_back_link = false, $http_status = null)

utf8_trim( $str, $charlist=false);　　//去空格

redirect($destination_url, $message);　　//重定向

fluxbb多数页面都写在一个文件中，如login.php包括登录、退出、忘记密码等操作，通过不同的action区分。

引入公用header.php、不同页面分别替换相应的内容（$pun_user变量），如title、要加载的css等。

$pun_user变量前面提到的check_cookie()函数中设置的值。　

 $pun_user = array();
 check_cookie($pun_user);

function check_cookie(&$pun_user){}　　　　//注意后面的&地址符

check_cookie(函数中，通过cookie值来判断用户信息，如是合法的已登录用户，直接将一些值保存到$pun_user，否则设置一些默认值。通过set_default_user()函数，并记录在线用户。

 //
 // Fill $pun_user with default values (for guests)
 //
 function set_default_user()
 {
     global $db, $db_type, $pun_user, $pun_config;

     $remote_addr = get_remote_address();

     // Fetch guest user
     $result = $db->query('SELECT u.*, g.*, o.logged, o.last_post, o.last_search FROM '.$db->prefix.'users AS u INNER JOIN '.$db->prefix.'groups AS g ON u.group_id=g.g_id LEFT JOIN '.$db->prefix.'online AS o ON o.ident=\''.$db->escape($remote_addr).'\' WHERE u.id=1') or error('Unable to fetch guest information', __FILE__, __LINE__, $db->error());
     if (!$db->num_rows($result))
         exit('Unable to fetch guest information. Your database must contain both a guest user and a guest user group.');

     $pun_user = $db->fetch_assoc($result);

     // Update online list
     if (!$pun_user['logged'])
     {
         $pun_user['logged'] = time();

         // With MySQL/MySQLi/SQLite, REPLACE INTO avoids a user having two rows in the online table
         switch ($db_type)
         {
             case 'mysql':
             case 'mysqli':
             case 'mysql_innodb':
             case 'mysqli_innodb':
             case 'sqlite':
                 $db->query('REPLACE INTO '.$db->prefix.'online (user_id, ident, logged) VALUES(1, \''.$db->escape($remote_addr).'\', '.$pun_user['logged'].')') or error('Unable to insert into online list', __FILE__, __LINE__, $db->error());
                 break;

             default:
                 $db->query('INSERT INTO '.$db->prefix.'online (user_id, ident, logged) SELECT 1, \''.$db->escape($remote_addr).'\', '.$pun_user['logged'].' WHERE NOT EXISTS (SELECT 1 FROM '.$db->prefix.'online WHERE ident=\''.$db->escape($remote_addr).'\')') or error('Unable to insert into online list', __FILE__, __LINE__, $db->error());
                 break;
         }
     }
     else
         $db->query('UPDATE '.$db->prefix.'online SET logged='.time().' WHERE ident=\''.$db->escape($remote_addr).'\'') or error('Unable to update online list', __FILE__, __LINE__, $db->error());

     $pun_user['disp_topics'] = $pun_config['o_disp_topics_default'];
     $pun_user['disp_posts'] = $pun_config['o_disp_posts_default'];
     $pun_user['timezone'] = $pun_config['o_default_timezone'];
     $pun_user['dst'] = $pun_config['o_default_dst'];
     $pun_user['language'] = $pun_config['o_default_lang'];
     $pun_user['style'] = $pun_config['o_default_style'];
     $pun_user['is_guest'] = true;
     $pun_user['is_admmod'] = false;
 }

//footer.php

页面header和footer内容通过$tpl_main变量保存，footer.php最后，exit($tpl_main);直接输出并终止运行。主要用到了输出缓冲的一些函数。

在整个fluxbb系统中，只看到了两个js文件，分别是common.js和minmax.js，而且两个文件都没超过3kb，其中minmax.js是在header.php引入了。想想自己，没有jquery就有点寸步难行了。

原文作者：lltong，博客园地址：http://www.cnblogs.com/lltong/