网站接入qq，微信，微博第三方登陆详解

三方登陆的整体思路是获取第三方中的openid，然后与用户关联（存到数据库），进行登陆。本文主要和大家分享网站接入qq，微信，微博第三方登陆详解，希望能帮助到大家。

现在需求是：两个（或多个）一级域名，如maxiye.cn和yexima.com，同时每个域名下有多个二级域名分布，如：app.maxiye.cn，new.maxiye.cn，old.maxiye.cn，app.yexima.com，new.yexima.com，old.yexima.com...等，但是这些域名下使用了同一份代码（对，就是马甲），共享数据库和session。同时旗下每个域名均包含pc，ios，Android端，如何全部接入第三方登陆？

qq，微信，微博接入要点：
1.申请入口：QQ是QQ互联，微信是微信开放平台，微博是微博开放平台；
2.回调域设置：QQ可以设置一级域名且可以有多个，必须http://开头，;结束，如http://maxiye.cn;http://yexima.com;；微信只能设置到二级域名且只能一个，格式为：app.maxiye.cn；
微博也可以设置一级域名且是一个：maxiye.cn；
3.unionid获取：多个app（同一开发者账号下）共享数据库，故需要使用unionid确认身份。QQ获取uuid需要额外申请权限，具体参考相同开发者账号下的不同appid应用如何打通；微信已有unionid获取接口；微博则uid即unionid；

坑：
1.QQ接口返回的结果好多是jsonp格式，需要手动剥离callback();
2.微博获取获取access_token竟然必须使用post，惊了；
3.微信不支持回调地址填写一级域名，所以需要使用统一域名（代理）作为回调地址，然后内部再重定向到发申请的域名；

下边是一个写好的工具类：

<?php
/* PHP SDK 第三方登录授权验证
 * @version 1.0.0
 * @author zyl
 * @copyright
 */

namespace app\helpers;

use yii\helpers\Url;
use Yii;

class OauthLogin
{
    public $server = &#39;&#39;;//接入第三方的域名
    public $proxy = &#39;app.maxiye.cn&#39;;//微信登录代理中转站点
    private $type = &#39;&#39;;//第三方类型：qq,weixin,weibo
    private $app_id = &#39;&#39;;//分配给网站的appid。
    private $app_secret = &#39;&#39;;//分配给网站的appkey。
    private $state = &#39;&#39;;//client端的状态值。用于第三方应用防止CSRF攻击，成功授权后回调时会原样带回。请务必严格按照流程检查用户与state参数状态的绑定。
    private $code = &#39;&#39;;//用户成功登录并授权，则会跳转到指定的回调地址，并在URL中带上Authorization Code。
    private $access_token;
    private $config = [//配置多个网站的appid&appkey
        &#39;maxiye.cn&#39; => [
            'qq' => [
                'app_id' => '100000000',
                'app_secret' => 'f9038c3d07c*******7884edf3e31708',
            ],
            'weixin' => [
                'app_id' => 'wxee7c90a7744c2002',
                'app_secret' => '13e649627894*******7a85a0e2f50e7',
            ],
            'weibo' => [
                'app_id' => '1200000000',
                'app_secret' => 'e074de8*******d3818d0df9ca28c459',
            ],
        ],
        'yexima.com' => [
            'qq' => [
                'app_id' => '101111244',
                'app_secret' => '6ca59c6a1b1*******77e636a10ac334',
            ],
            'weixin' => [
                'app_id' => 'wx0b822222ea9ee323',
                'app_secret' => '7f9cbd*******f37ce7b4c267bdde029',
            ],
            'weibo' => [
                'app_id' => '911111998',
                'app_secret' => '5b21c452f88e2982*******1722d8fcd',
            ],
        ],
    ];

    function __construct($params = [])
    {
        $this->type = $params['type'];
        $this->server = $_SERVER['SERVER_NAME'];
        foreach ($this->config as $k => $v) {
            if (stristr($this->server, $k) && isset($v[$this->type])) {
                $this->app_id = $v[$this->type]['app_id'];
                $this->app_secret = $v[$this->type]['app_secret'];
            }
        }
        if (isset($params['code'])) {
            $this->code = $params['code'];
        }
    }

    /**
     * 获取用户授权验证的链接
     * @return string
     */
    public function getOauthUrl()
    {
        $this->state = md5(uniqid(rand(), TRUE));
        Yii::$app->session->setFlash('oauth_state', $this->state);
        $redirect_uri = urlencode(Url::to(['login-by-openid', 'type' => $this->type, true));
        if ($this->type == 'weixin' && $this->server != $this->proxy) {//微信回调多域名代理处理
            $redirect_uri = str_replace($this->server, $this->proxy, $redirect_uri) . '%26redirect%3D' . $this->server;
        }
        $url = '';
        switch ($this->type) {
            case 'qq'://qq回调域填写一级域名并以“;”结束：http://maxiye.cn;http://yexima.com;
                $url = "https://graph.qq.com/oauth/show?which=Login&display=pc&response_type=code&client_id={$this->app_id}&state={$this->state}&display=web&redirect_uri={$redirect_uri}";
                break;
            case 'weixin'://app.maxiye.cn不支持只填写二级域名
                $url = "https://open.weixin.qq.com/connect/qrconnect?response_type=code&appid={$this->app_id}&state={$this->state}&scope=snsapi_login&redirect_uri={$redirect_uri}#wechat_redirect";
                break;
            case 'weibo'://微博设置安全域名：maxiye.cn
                $url = "https://api.weibo.com/oauth2/authorize?response_type=code&client_id={$this->app_id}&state={$this->state}&display=web&redirect_uri={$redirect_uri}";
                break;

            default:

                break;
        }
        return $url;
    }

    /**
     * 获取针对开发者账号的惟一uuid
     * @return string unionid或uid
     */
    public function getUuid()
    {
        $openid = '';
        if ($this->type == 'qq') {
            $this->getAccessToken();
        } else {
            $openid = $this->getOpenid();
        }
        $access_token = $this->access_token;
        $uuid = '';
        if ($access_token) {
            switch ($this->type) {
                case 'qq':
                    $url = "https://graph.qq.com/oauth2.0/me?access_token={$access_token}&unionid=1";
                    // 返回示例...
                    /*callback({
                           "client_id":"YOUR_APPID",
                           "openid":"YOUR_OPENID",
                           "unionid":"YOUR_UNIONID"
                    });*/
                    $result = $this->get_contents($url);
                    if (strpos($result, "callback") !== false) {
                        $lpos = strpos($result, "(");
                        $rpos = strrpos($result, ")");
                        $result = json_decode(substr($result, $lpos + 1, $rpos - $lpos - 1), true);
                        $uuid = isset($result['unionid']) ? $result['unionid'] : '';
                    }
                    return $uuid;
                    // return $openid;
                    break;
                case 'weixin':
                    $url = "https://api.weixin.qq.com/sns/userinfo?access_token={$access_token}&openid={$openid}";
                    // 返回示例
                    /*{
                        "openid":"OPENID",
                        "nickname":"NICKNAME",
                        "sex":1,
                        "province":"PROVINCE",
                        "city":"CITY",
                        "country":"COUNTRY",
                        "headimgurl": "http://wx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/0",
                        "privilege":[
                            "PRIVILEGE1",
                            "PRIVILEGE2"
                        ],
                        "unionid": " o6_bmasdasdsad6_2sgVt7hMZOPfL"

                    }*/
                    $result = json_decode($this->get_contents($url), true);
                    return isset($result['unionid']) ? $result['unionid'] : '';
                    break;
                case 'weibo':
                    return $openid;
                    break;

                default:

                    break;
            }
        }
        return $uuid;
    }

    /**
     * 获取access_token
     * @param boolean $true false表示获取原始结果，true获取真正的access_token
     * @return string json包|string
     */
    public function getAccessToken($true = true)
    {
        //验证state
        if (Yii::$app->request->get('state', '') != Yii::$app->session->getFlash('oauth_state')) {
            return '';
        }
        $redirect_uri = urlencode(Url::to(['login-by-openid', 'type' => $this->type], true));
        $url = '';
        switch ($this->type) {
            case 'qq':
                $url = "https://graph.qq.com/oauth2.0/token?grant_type=authorization_code&code={$this->code}&client_id={$this->app_id}&client_secret={$this->app_secret}&redirect_uri={$redirect_uri}";
                //返回示例...
                //access_token=15C0CE01C0311240F9091A7DB6828E62&expires_in=7776000&refresh_token=7BFCE2E5B773D4F5531561A10E1C2B2D
                break;
            case 'weixin':
                $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$this->app_id}&secret={$this->app_secret}&code={$this->code}&grant_type=authorization_code";
                //返回示例
                /*{
                "access_token":"ACCESS_TOKEN",
                "expires_in":7200,
                "refresh_token":"REFRESH_TOKEN",
                "openid":"OPENID",
                "scope":"SCOPE"
                }*/
                break;
            case 'weibo':
                $url = "https://api.weibo.com/oauth2/access_token?client_id={$this->app_id}&client_secret={$this->app_secret}&grant_type=authorization_code&redirect_uri={$redirect_uri}&code={$this->code}";//新浪微博
                $post_data = [];
                return $this->post($url, $post_data);//撒币制杖
                //返回示例
                /*{
                    "access_token": "SlAV32hkKG",
                    "remind_in": 3600,
                    "expires_in": 3600,
                    "uid":"12341234"
                }*/
                break;

            default:

                break;
        }
        if ($true) {
            $res_access_token = $this->get_contents($url);
            if ($this->type == 'qq' && strpos($res_access_token, "access_token") !== false) {
                $token_result = ['access_token' => explode('=', explode('&', $res_access_token)[0])[1]];
            } else {
                $token_result = json_decode($res_access_token ?: '{}', true);
            }
            $access_token = !empty($token_result['access_token']) ? $token_result['access_token'] : '';
            $this->access_token = $access_token;
            return $access_token;
        } else {
            return $this->get_contents($url);
        }
    }

    /**
     * post
     * post方式请求资源
     * @param string $url 基于的baseUrl
     * @param array $keysArr 请求的参数列表
     * @param int $flag 标志位
     * @return string           返回的资源内容
     */
    public function post($url, $keysArr, $flag = 0)
    {

        $ch = curl_init();
        if (!$flag) curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $keysArr);
        curl_setopt($ch, CURLOPT_URL, $url);
        $ret = curl_exec($ch);

        curl_close($ch);
        return $ret;
    }

    /**
     * get_contents
     * 服务器通过get请求获得内容
     * @param string $url 请求的url,拼接后的
     * @return string           请求返回的内容
     */
    public function get_contents($url)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_URL, $url);
        $response = curl_exec($ch);
        curl_close($ch);

        //-------请求为空
        if (empty($response)) {
            return '{}';
        }

        return $response;
    }

    /**
     * 获取openid
     * @return string openid
     */
    public function getOpenid()
    {
        $res_access_token = $this->getAccessToken(false);
        if ($this->type == 'qq' && strpos($res_access_token, "access_token") !== false) {
            $access_token = ['access_token' => explode('=', explode('&', $res_access_token)[0])[1]];
        } else {
            $access_token = json_decode($res_access_token ?: '{}', true);
        }
        $openid = '';
        if (isset($access_token['access_token'])) {
            $this->access_token = $access_token['access_token'];
            switch ($this->type) {
                case 'qq':
                    $url = "https://graph.qq.com/oauth2.0/me?access_token={$access_token['access_token']}";
                    // 返回示例...
                    // callback( {"client_id":"101406183","openid":"6C611CBE0C72F765572AE2472C9B59A4"} );
                    $result = $this->get_contents($url);
                    if (strpos($result, "callback") !== false) {
                        $lpos = strpos($result, "(");
                        $rpos = strrpos($result, ")");
                        $result = json_decode(substr($result, $lpos + 1, $rpos - $lpos - 1), true);
                        $openid = isset($result['openid']) ? $result['openid'] : '';
                    }
                    break;
                case 'weixin':
                    return $access_token['openid'];
                    break;
                case 'weibo':
                    return $access_token['uid'];
                    /*$url = "https://api.weibo.com/oauth2/get_token_info?access_token={$access_token['access_token']}";
                    //返回示例
                    {
                        "uid": 1073880650,
                        "appkey": 1352222456,
                        "scope": null,
                        "create_at": 1352267591,
                        "expire_in": 157679471
                    }
                    $result = $this->get_contents($url);
                    $openid = isset($result['uid'])?$result['uid']:'';*/
                    break;

                default:

                    break;
            }
        }
        return $openid;
    }
}

使用方法如下：

//第三方登录界面处理
public function actionLoginByOpenid(){
    Yii::$app->response->format= Response::FORMAT_HTML;
    $params = Yii::$app->request->get();
    $oauth = new OauthLogin($params);
    if(empty($params['code'])){
        $url = $oauth->getOauthUrl();
        return $this->redirect($url);
    }else{
        //微信代理跳转处理
        if(isset($params['redirect']) && $params['redirect'] != $oauth->server){
            $proxy = $oauth->proxy;
            $server = $params['redirect'];
            return $this->redirect(str_replace($proxy, $server, Url::current(['redirect'=>null], 'http')));
        }
        $openid = $oauth->getUuid();
        if (!$openid) {
            //失败处理TODO
        } else {
            //成功处理TODO
        }
        
    }
}

具体流程（qq为例）如下：
1.用户点击QQ登陆图标，访问链接http://app.maxiye.cn/site/login-by-openid?type=qq；
2.服务器处理获取QQ的授权链接，重定向；
3.QQ在回调地址中添加code参数（Authorization Code），回调http://app.maxiye.cn/site/login-by-openid?type=qq&state=4a78***&code=1CA8DF***；
4.服务器根据code参数，验证state，获取access_token，然后获取unionid(uid)，处理结果。

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