微信小程序 登录 获取unionID
首先先明确一点，用户的openID在微信体系的各个应用内是不同的，比如小程序和公众号里用户的openID是不一样的，所以openID不能用来确定用户的唯一性。那这时就会用到unionID。因为同一个微信开放平台下，相同主体的App、公众号、小程序的unionid是相同的，所以可以用unionID来锁定是不是同一个用户。
其次来说一下如何获取unionID，获取unionID需要解密encryptedData。需要调用wx.login来获取code，用code去换取session_key，以及调用wx.getUserInfo获取encryptedData和iv。
最后来贴一下代码：将code 、encryptedData和iv一起发送到后端
.js
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 |
wx.login({ success: res => { console.log(res) wx.getUserInfo({ success: function(result) { console.log(result) if (res.code) { this.login(result.encryptedData, result.iv,res.code) } } }) } })//登录 login: function (encryptedData, iv, code) { var that = this; var url = that.globalData.url; //解密用户信息 wx.request({ url: url + '/api.php', method: 'GET', data: { exec: 'get_unionid', chid: that.globalData.chid, skey: that.globalData.skey, sign: that.globalData.sign, encryptedData: encryptedData, iv: iv, code: code },header: { 'Accept': 'application/json', "Content-Type": "application/x-www-form-urlencoded" },success: function (res) { //从数据库获取用户信息 console.log(res); if (typeof res.data != 'string') { return false } var msg = JSON.parse(res.data); that.globalData.openId = msg.openId, //从数据库获取用户信息 wx.request({ url: url + '/api2user.php', method: 'POST', data: { exec: 'login', chid: that.globalData.chid, skey: that.globalData.skey, sign: that.globalData.sign, ukey: msg.openId, unionId: msg.unionId, },header: { 'Accept': 'application/json', "Content-Type": "application/x-www-form-urlencoded" }, success: function (res) { console.log(res.data); if (!res.data.status) { var list = res.data.list; if (list) { that.globalData.uniq = res.data.uniq, that.globalData.userInfo = res.data.list[0] console.log(that.globalData.userInfo) console.log("小程序登录用户信息成功！"); } } } }) } }) }, |
后端使用的是PHP
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 |
class get_unionid { private $action; private $result; private $request; private $sessionKey; private $encryptedData ; private $iv ; private $appid = '你自己的APPID'; private $url = 'https://api.weixin.qq.com/sns/jscode2session'; private $secret = '你自己的secret'; private $js_code ; public function __construct($basic = '') { } /** * 接收参数 */ public function put($input = '') { $this->request = $input; $this->encryptedData = $input['encryptedData']; $this->iv = $input['iv']; $this->js_code = $input['code']; } //主方法 public function logic($logic = '') { //获取openID、session_key $info = $this->get_info(); $info = json_decode($info,true); if ($info) { $this->sessionKey = $info['session_key']; $errCode = $this->decryptData($this->encryptedData, $this->iv); $this->result = $errCode; } } /** * 检验数据的真实性，并且获取解密后的明文. * @param $encryptedData string 加密的用户数据 * @param $iv string 与用户数据一同返回的初始向量 * @param $data string 解密后的原文 * * @return int 成功0，失败返回对应的错误码 */ private function decryptData( $encryptedData, $iv ) { if (strlen($this->sessionKey) != 24) { return $this->ErrorCode('IllegalAesKey'); } $aesKey=base64_decode($this->sessionKey); if (strlen($iv) != 24) { return $this->ErrorCode('IllegalIv'); } $aesIV=base64_decode($iv); $aesCipher=base64_decode($encryptedData); $result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV); $dataObj=json_decode( $result ); if( $dataObj == NULL ) { return $this->ErrorCode('IllegalBuffer'); } if( $dataObj->watermark->appid != $this->appid ){ return $this->ErrorCode('IllegalBuffer'); } return $result; } /** * error code 说明. * -41001: encodingAesKey 非法 * -41003: aes 解密失败 * -41004: 解密后得到的buffer非法 * -41005: base64加密失败 * -41016: base64解密失败 */ private function ErrorCode($msg) { switch($msg) { case 'OK': return 0; break; case 'IllegalAesKey': return -41001; break; case 'IllegalIv': return -41002; break; case 'IllegalBuffer': return -41003; break; case 'DecodeBase64Error': return -41004; break; } } //获取openID、session_key private function get_info(){ $url = $this->url . '?appid='. $this->appid .'&secret='.$this->secret . '&js_code=' . $this->js_code .'&grant_type=authorization_code'; $ch = curl_init(); //设置选项，包括URL curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, |