php单点登录之模拟淘宝天猫同步登录

说到单点登录大家都很了解，一个站点登录其他域会自动登录。

单点登录SSO（Single Sign On）的方法有很多，比如：p3p、共享session、共享cookice、第三方OAuth认证。

这里模拟淘宝、天猫登录。是模拟噢，要做到安全就要进行很多安全验证RSA加密了，带签名的参数了等。

淘宝与天猫登录时都是在淘宝登录，登录后redirect跳转到各自的网站HTTP_REFERER。

本地模拟，MY淘宝：http://my-taobao.com:8080/      My天猫：http://my-tmall.com/

为什么本地模拟的时候要修改一个的默认端口80为8080或其他端口，参考：http://www.cnblogs.com/dcb3688/p/4608003.html

My淘宝有三个文件，分别是：index.php login.php 与api.php

index.php

<?php
session_start();
$session_name=  isset($_SESSION['name'])?$_SESSION['name']:'';
$session_token=  isset($_SESSION['token'])?$_SESSION['token']:'';

if($session_name){
     echo "<strong>{$session_name}</strong>您已登录My-Taobao.com &nbsp; <a href='/api.php?action=logout&token={$session_token}'>退出</a>";
}else{
     echo "您还未登录My-Taobao.com &nbsp; <a href='/login.php'>登录</a>";
}

login.php

<meta charset="utf-8"/>
<form action="api.php" method="post">
    <input type="text" name="name">
    <input type="hidden" name="action" value="login">
    <input type="hidden" name="redirect" value="<?php echo $_SERVER['HTTP_REFERER'] ?>">
    <input type="submit">
</form>

<?php

session_start();
$session = isset($_SESSION['token']) ? $_SESSION['token'] : '';
$redirect = isset($_REQUEST['redirect']) ? $_REQUEST['redirect'] : "/";
$action = isset($_POST['action']) ? $_POST['action'] : '';
/**
 * post 登录
 */
if ($action == 'login') {
    if ($session) {  #已经是登录的状态
        echo '<meta charset="UTF-8"><script type="text/javascript">window.location.href = "' . $redirect . '";</script>';
    }
    $session = md5(time() . uniqid());
    $_SESSION['token'] = $session;
    $_SESSION['name'] = $_POST['name'];
    $_SESSION['create_time'] = time();

    if (!is_dir('session')) {
        mkdir('session');
    }
    $fopen = fopen('session/' . $_SESSION['token'], 'w+'); //新建文件命令
    fputs($fopen, serialize($_SESSION)); //向文件中写入内容;
    fclose($fopen);

    exit('<meta charset="UTF-8"><script type="text/javascript">window.location.href = "' . $redirect . '";</script>');
}

/**
 * curl登录验证
 */
if ($action == 'curl_valid') {
    $token = isset($_POST['token']) ? $_POST['token'] : '';
    $res = 0;
    if ($token) {
        if (file_exists('session/' . $token)) { # 存在该文件
            $data = unserialize(file_get_contents('session/' . $token));
            if (isset($data['create_time'])) {
                if ($data['create_time'] > time() - 7200) {
                    $res = 1;
                }
            }
        }
    }

    exit( json_encode(["status"=>$res]));
}

/**
 * get 退出
 */
$actionLogout = isset($_GET['action']) ? $_GET['action'] : '';
if ($actionLogout == 'logout') {
    if (isset($_GET['token'])) {
        unlink("session/".$_SESSION['token']);
        unset($_SESSION['token']);
        unset($_SESSION['name']);
    }
    exit('<script type="text/javascript">window.location.href = "' . $_SERVER['HTTP_REFERER'] . '";</script>');
}

/**
 * jsonp 访问
 */
$jsonp = isset($_GET['jsonp_callback']) ? $_GET['jsonp_callback'] : '';
if ($jsonp) {
    $status = 0;
    $node = [];
    $msg = '';
    if (isset($_SESSION['token'])) {
        $status = 1;
        $msg = 'success';
        $node = $_SESSION;
    } else {
        $msg = 'fail';
    }
    exit($jsonp . '(' . json_encode(['status' => $status, 'msg' => $msg, 'node' => $node]) . ')');
}

My天猫有两个文件： index.php 与 list.php

index.php

<span id="line">

</span>
<script src="http://yiiui.com/static/v1/JUI/js/jquery-1.7.2.min.js"></script>

<script >

    /**
     * 获取cookie
     */
    function getCookie(cookiename) {
        var result;
        var mycookie = document.cookie;
        var start2 = mycookie.indexOf(cookiename + "=");
        if (start2 > -1) {
            start = mycookie.indexOf("=", start2) + 1;
            var end = mycookie.indexOf(";", start);

            if (end == -1) {
                end = mycookie.length;
            }
            result = unescape(mycookie.substring(start, end));
        }
        return result;
    }
    /**
     * 设置cookie
     */
    function setCookie(name, value) {
        var Days = 30;
        var exp = new Date();
        exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
        document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
    }

    var token = getCookie("token");

    if (token === null) { // 首次访问my-tmall.com

        // php curl 不能获取session因为curl是服务器端请求，jsonp是本地的客户端请求。
        $.getJSON("http://my-taobao.com:8080/api.php?jsonp_callback=?", function (data) {
            if (data.status == 1) {
                data = data.node;
                setCookie('token', data.token);
                console.log(data);
                $("#line").html("<strong>" + data.name + "</strong>您已登录My-Tmall.com &nbsp; <a href='http://my-taobao.com:8080/api.php?action=logout&token=" + data.token + "'>退出 </a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href='list.php'>列表</a>");
            } else {
                $("#line").html("您还未登录My-Tmall.com &nbsp; <a href='http://my-taobao.com:8080/login.php'>登录</a>");
            }
        });
    } else { // 已经登录过，查询现在登录状态
        $.getJSON("http://my-taobao.com:8080/api.php?jsonp_callback=?", function (data) {
            if (data.status == 1) {  // 登录
                data = data.node;
                if (data.token != token) {  // 登陆其他账户了
                    setCookie('token', data.token);
                    window.location.href = document.location.href;
                } else {
                    $("#line").html("<strong>" + data.name + "</strong>您已登录My-Tmall.com &nbsp; <a href='http://my-taobao.com:8080/api.php?action=logout&token=" + data.token + "'>退出</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href='list.php'>列表</a>");
                }
            } else { // 未登录
                $("#line").html("您还未登录My-Tmall.com &nbsp; <a href='http://my-taobao.com:8080/login.php'>登录</a>");
            }
        });
    }

</script>

list.php

<?php

$token = isset($_COOKIE["token"]) ? $_COOKIE["token"] : '';
//print_r($token);

$curl = curl(["action" => 'curl_valid', "token" => $token], "http://my-taobao.com:8080/api.php");
$ac = json_decode($curl, TRUE);

if (isset($ac['status']) && $ac['status'] == 1) { # 登录中
    echo '<ul>'
    . '<li>1111</li>'
    . '<li>2222</li>'
    . '<li>3333</li>'
    . '<li>4444</li>'
    . '<li>5555</li>'
    . '</ul>';
} else {
    echo '已退出';
}

function curl($data, $url, $method = 'POST', $headers = array()) {
    $ch = curl_init();
    $method_upper = strtoupper($method);
    if ($method_upper == 'POST') {
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    } else {
        $url = $url . (strpos($url, '?') ? '&' : '?') . (is_array($data) ? http_build_query($data) : $data);
        curl_setopt($ch, CURLOPT_URL, $url);
    }
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method_upper);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);    //SSL 报错时使用
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);    //SSL 报错时使用
    if ($headers) {
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }
    $tmpInfo = curl_exec($ch);
    if (curl_errno($ch)) {
        exit(curl_error($ch));
    }
    curl_close($ch);
    return $tmpInfo;
}

很简单的原理，My淘宝是正常网站登录与注销（主站）。当任何一个网站登录且访问My天猫，My天猫就Jsonp请求当前浏览器中是否登录过MY淘宝。如果登录过就种下一个cookice保存MY淘宝sessionKey。

当要访问My天猫其他页面的时候可直接通过获取Cookice使用php的CURL请求网站MY淘宝是否登录。