How to realize the login function in Mini Program development

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WeChat Mini Programs logged in

one。 Mini Program does not support cookie sessions

1. Maintain a session by passing and verifying 3rd_session

2. 3rd_session can execute the command '`head-n 80 / dev/urandom | tr-dc A-Za-z0-9 | head-c 168`

3. Use Redis or database to store session

4. The generated 3rd_session is sent to the client and written to storage

5. The client must bring 3rd_session with each request

2. Decoding of encrypted data

1. $iv,$code is encrypted data, because the + sign becomes a space during the request due to coding reasons, so we need to convert it back with the following method

Function define_str_replace ($data) {return str_replace (','+', $data);}

3. Examples:

Php

/ / Wechat login to public function weixin_login () {$session_db=D ('Session'); $session_id=I (' get.sessionid',''); $session=$session_db- > getSession ($session_id); if (! empty ($session)) {$this- > ajaxReturn (['error_code'= > 0training session = > $session_id]);} else {$iv=define_str_replace (I (' get.iv')) / / convert spaces to + $encryptedData=urldecode (I ('get.encryptedData')); / decode $code=define_str_replace (I (' get.code')); / / convert spaces to + $msg=D ('Weixin')-> getUserInfo ($code,$encryptedData,$iv); / / get Wechat user information (openid) if ($msg [' errCode'] = = 0) {$open_id=$msg ['data']-> openId; $users_db=D (' Users') $info=$users_db- > getUserInfo ($open_id); if (! $info | | empty ($info)) {$users_db- > addUser (['open_id'= > $open_id,'last_time'= > [' exp','now ()']]); / / user information is stored in $info=$users_db- > getUserInfo ($open_id) / / get user information $session_id= `head-n 80 / dev/urandom | tr-dc A-Za-z0-9 | head-c 168`; / generate 3rd_session $session_db- > addSession (['uid'= > $info [' id'], 'id'= > $session_id]); / / Save session} if ($session_id) {$this- > ajaxReturn ([' error_code'= > 0 training session = > $session_id]) / / return the 3rd_session to the client} else {$this- > ajaxReturn (['error_code'= > 0 recording session session = > $session_db- > getSid ($info [' id'])]);}} else {$this- > ajaxReturn (['error_code'= >' user information acquisition failed!']) ;}

Get Wechat information model (including information decryption, click download for official examples)

Require_once ABS_APP_PATH.'/Addon/Aes/wxBizDataCrypt.php';class WeixinModel {/ / get the user information of Wechat (openid) public function getUserInfo ($code,$encryptedData,$iv) {$appid=C ('appid'); $secret=C (' secret'); $grant_type='authorization_code'; $url=' https://api.weixin.qq.com/sns/jscode2session'; $url= sprintf ("% swords appendages% swords secretaries% swords jsails codewords% swatches grantless typeballs%", $url,$appid,$secret,$code,$grant_type); $user_data=json_decode (file_get_contents ($url)); $session_key= define_str_replace ($user_data- > session_key); $data= "; $wxBizDataCrypt=new\ WXBizDataCrypt ($appid,$session_key); $errCode=$wxBizDataCrypt- > decryptData ($encryptedData,$iv,$data) Return ['errCode'= > $errCode,'data'= > json_decode ($data),' session_key'= > $session_key];}}

Javascript

GetUserInfo: function (cb) {var that = this if (this.globalData.userInfo) {typeof cb = = "function" & & cb (this.globalData.userInfo)} else {/ / call login interface wx.login ({success: function (r) {wx.getUserInfo ({success: function (res) {that.login ({code: r.code) Iv: res.iv, encryptedData: encodeURIComponent (res.encryptedData),}) that.globalData.userInfo = res.userInfo typeof cb = = "function" & & cb (that.globalData.userInfo)}})})}} Login: function (param) {wx.request ({url: this.requestUrl ('Index/weixin_login'), data: param, header: {' content-type': "application/json",}, success: function (res) {var data = JSON.parse (res.data.trim ()) Wx.setStorageSync ('sessionid', data.sessionid);}})}, the above is about "how to achieve login function in Mini Program development" this article, I believe you all have a certain understanding, I hope the content shared by the editor will be helpful to you, if you want to know more related knowledge content, please follow the industry information channel.