discuz登录流程解析(版本X3.2)

discuz登录流程解析，最近在研究，Ucenter的同步登陆机制，就先从discuz的登录开始了

1.form表单提交

member.php?mod=logging&action=login&loginsubmit=yes&handlekey=login&loginhash=Lm137&inajax=1

处理脚本  source/module/member/member_logging.php

$ctl_obj = new logging_ctl();//初始化登陆对象,source\class\class_member.php=>class logging_ctl 
 
$ctl_obj->setting = $_G['setting'];
$method = 'on_'.$_GET['action'];//$method='on_login';
$ctl_obj->template = 'member/login';
 
$ctl_obj->$method();//调用source\class\class_member.php=>on_login()

下面对source\class\class_member.php的on_login进行分析

2.source\class\class_member.php

   on_login函数太长，只贴出其核心部分，该函数也是登录过程中的核心函数，通过 userlogin（uc_client\control\user.php）进行数据分析，并对返回结果$result进行分析处理，返回结果$result['status']>0时，显示登陆成功，setloginstatus进行登录状态记录

$result = userlogin($_GET['username'], $_GET['password'], $_GET['questionid'], $_GET['answer'], $this->setting['autoidselect'] ? 'auto' : $_GET['loginfield'], $_G['clientip']);//95行左右，userlogin为核心处理函数，来至uc_client\client.php//根据$result['status']返回值进行处理
············
if($result['status'] > 0) //当$result['status']>0时，为登陆成功
setloginstatus($result['member'], $_GET['cookietime'] ? 2592000 : 0);//记录登录状态，完成登录动作

下面对uc_client\client.php的uc_user_login进行分析

3.uc_client\client.php

函数uc_user_login通过call_user_func调用uc_client\control\user.php的onlogin函数

function uc_user_login($username, $password, $isuid = 0, $checkques = 0, $questionid = '', $answer = '', $ip = '') {
	$isuid = intval($isuid);
	$return = call_user_func(UC_API_FUNC, 'user', 'login', array('username'=>$username, 'password'=>$password, 'isuid'=>$isuid, 'checkques'=>$checkques, 'questionid'=>$questionid, 'answer'=>$answer, 'ip' => $ip));//UC_API_FUNC= uc_api_mysql，通过call_user_func回调调用uc_api_mysql,进行传参数，通过uc_api_mysql引入uc_client\control\user.php的onlogin函数
	return UC_CONNECT == 'mysql' ? $return : uc_unserialize($return);
}
...................
function uc_api_mysql($model, $action, $args=array()) {
	global $uc_controls;
	if(empty($uc_controls[$model])) {
		if(function_exists("mysql_connect")) {
			include_once UC_ROOT.'./lib/db.class.php';
		} else {
			include_once UC_ROOT.'./lib/dbi.class.php';
		}
		include_once UC_ROOT.'./model/base.php';
		include_once UC_ROOT."./control/$model.php";//引入uc_client\control\user.php
		eval("\$uc_controls['$model'] = new {$model}control();");
	}
	if($action{0} != '_') {
		$args = uc_addslashes($args, 1, TRUE);
		$action = 'on'.$action;
		$uc_controls[$model]->input = $args;
		return $uc_controls[$model]->$action($args);//调用uc_client\control\user.php的onlogin函数传参数
	} else {
		return '';
	}
}

4.uc_client\control\user.php

onlogin函数对数据进行分析，返回结果，回第2步中source\class\class_member.php的

function onlogin() {
		$this->init_input();
		$isuid = $this->input('isuid');
		$username = $this->input('username');
		$password = $this->input('password');
		$checkques = $this->input('checkques');
		$questionid = $this->input('questionid');
		$answer = $this->input('answer');
		$ip = $this->input('ip');
 
		$this->settings['login_failedtime'] = is_null($this->settings['login_failedtime']) ? 5 : $this->settings['login_failedtime'];
 
		if($ip && $this->settings['login_failedtime'] && !$loginperm = $_ENV['user']->can_do_login($username, $ip)) {
			$status = -4;
			return array($status, '', $password, '', 0);
		}
 
		if($isuid == 1) {
			$user = $_ENV['user']->get_user_by_uid($username);
		} elseif($isuid == 2) {
			$user = $_ENV['user']->get_user_by_email($username);
		} else {
			$user = $_ENV['user']->get_user_by_username($username);
		}
 
		$passwordmd5 = preg_match('/^\w{32}$/', $password) ? $password : md5($password);
		if(empty($user)) {
			$status = -1;
		} elseif($user['password'] != md5($passwordmd5.$user['salt'])) {
			$status = -2;
		} elseif($checkques && $user['secques'] != $_ENV['user']->quescrypt($questionid, $answer)) {
			$status = -3;
		} else {
			$status = $user['uid'];
		}
		if($ip && $this->settings['login_failedtime'] && $status <= 0) {
			$_ENV['user']->loginfailed($username, $ip);
		}
		$merge = $status != -1 && !$isuid && $_ENV['user']->check_mergeuser($username) ? 1 : 0;
		return array($status, $user['username'], $password, $user['email'], $merge);
	}

登录解析完成完成