discuz登錄流程解析(版本X3.2)

原創

我是妖怪_

2020-02-21 12:40

discuz登錄流程解析，最近在研究，Ucenter的同步登陸機制，就先從discuz的登錄開始了

1.form表單提交

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

處理腳本 source/module/member/member_logging.php

$ctl_obj = new logging_ctl();//初始化登陸對象,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();//調用source\class\class_member.php=>on_login()

下面對source\class\class_member.php的on_login進行分析

2.source\class\class_member.php

on_login函數太長，只貼出其核心部分，該函數也是登錄過程中的核心函數，通過 userlogin（uc_client\control\user.php）進行數據分析，並對返回結果$result進行分析處理，返回結果$result['status']>0時，顯示登陸成功，setloginstatus進行登錄狀態記錄

$result = userlogin($_GET['username'], $_GET['password'], $_GET['questionid'], $_GET['answer'], $this->setting['autoidselect'] ? 'auto' : $_GET['loginfield'], $_G['clientip']);//95行左右，userlogin爲核心處理函數，來至uc_client\client.php//根據$result['status']返回值進行處理
············
if($result['status'] > 0) //當$result['status']>0時，爲登陸成功
setloginstatus($result['member'], $_GET['cookietime'] ? 2592000 : 0);//記錄登錄狀態，完成登錄動作

下面對uc_client\client.php的uc_user_login進行分析

3.uc_client\client.php

函數uc_user_login通過call_user_func調用uc_client\control\user.php的onlogin函數

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，通過call_user_func回調調用uc_api_mysql,進行傳參數，通過uc_api_mysql引入uc_client\control\user.php的onlogin函數
 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);//調用uc_client\control\user.php的onlogin函數傳參數
 } else {
 return '';
 }
}

4.uc_client\control\user.php

onlogin函數對數據進行分析，返回結果，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);
 }