詳解二維碼登入的原理

這篇文章主要大家詳細解析了微信QQ的二維碼登入原理js程式碼，具有一定的參考價值，有興趣的小夥伴們可以參考一下

在很多地方就是都出現了使用二維碼登錄，二維碼付款，二維碼帳戶等應用(這裡的二維碼種馬，詐騙就不說了)，二維碼驗證，多終端輔助授權應用開始多起來，這裡先說下啥是二維碼，其實二維碼就是存了二進位資料的黑白圖片，當出現要求二維碼登入的時候，伺服器會產生一條臨時的唯一的二維碼訊息，發送到客戶端以二維碼(圖片)的形式寫入網頁，然後你會看到統一的四個方形的二維碼，如果做的好這個二維碼信息應該是有時效的，這裡暫且不考慮這些，就簡單的微信登入作為例子看看吧：

首先說下整個授權流程：

#在客戶端網頁中會不斷向伺服器發送https連接，並且這裡傳輸很少的資料之後就斷開連接了，下面看下微信網頁中這個login1c709c.js檔案：

(function($, _aoWin) {

 _aoWin.QRLogin = {};
 _aoWin.LoginLog = "";
 var _sBaseHost = "",
 _oLoginQrCodeImg = document.getElementById("loginQrCode");
 if (document.domain == "qq.com") {
 _sBaseHost = "weixin.qq.com";
 } else if(location.hostname.match(/(wechat\.com)$/)){
 _sBaseHost = "wechat.com";
 }else{
 _sBaseHost = "wechatapp.com";
 }

 var show_tip = 1,
 _sCurUUId,
 _oResetTimeout,
 _aWebMMCallbacks = [],
 _oDetactWebMMInterval = setInterval(function(){
  if(_aoWin.WebMM){
  clearInterval(_oDetactWebMMInterval);
  var callback;
  while(callback = _aWebMMCallbacks.shift()){
   if(typeof(callback) != "function") continue;
   callback();
  }
  }
 }, 1000);

 function _logInPage(_asLog){
 _aoWin.LoginLog = LoginLog + _asLog + "\n";
 }

 function _afterLoadWebMMDo(callback){
 if(!_aoWin.WebMM){
  _aWebMMCallbacks.push(callback);
 }else{
  callback();
 }
 }

 function _reportNow(text){
 _logInPage(text);
 _afterLoadWebMMDo(function(){
  WebMM.ossLog({Text: text});
  WebMM.flushOssLog();
 });
 }

 var reLoadQRImgCount = 0,
 loadQRCodeTime = 0,
 loadQRImgSucc = function(){
  clearInterval(loadQRImgWatchDog);
  _logInPage("Load QRCode Success, time=" + (new Date().getTime() - loadQRCodeTime) + "ms, reload count: " + reLoadQRImgCount);
 },
 loadQRImgFail = function(img){
  _reportNow("Load QRcode fail!" + status + ", src: " + img.src + ", time: " + (new Date().getTime() - loadQRCodeTime) + "ms");
 },
 loadQRImgWatchDog = null;
 function _loadQRImg(uuid) {
 _poll(uuid);
 _logInPage("Load QRCode Start");
 loadQRCodeTime = new Date().getTime();

 _oLoginQrCodeImg.onload = function(){
  loadQRImgSucc();
  _oLoginQrCodeImg.onload = null;
 };
 _oLoginQrCodeImg.onerror = function(){loadQRImgFail(this)};
 _oLoginQrCodeImg.src = "https://login."+_sBaseHost+"/qrcode/"+uuid+"?t=webwx";

 loadQRImgWatchDog = setInterval(function(){
  if (reLoadQRImgCount >= 5) {
  _reset();
  return;
  }
  reLoadQRImgCount++;

  var _img = new Image();
  _img.onload = function () {
  if(!_oLoginQrCodeImg.onload) return;

  _oLoginQrCodeImg.onload = null;
  _oLoginQrCodeImg.src = this.src;//replace
  loadQRImgSucc();
  };
  _img.onerror = function(){loadQRImgFail(this)};
  _img.src = _oLoginQrCodeImg.src + "&r=" + new Date().getTime();
 }, 5000);
 }

 var _sSecondRequestTime = 0,
 _nAjaxTimeout = 100 * 1000,
 _nNewLoginFuncErrCount = 0;
 function _poll(_asUUID) {
 var _self = arguments.callee,
  _nTime = 0;
 _sCurUUId = _asUUID;

 _logInPage("_poll Request Start, time: " + new Date().getTime());
 _nTime = new Date().getTime();
 $.ajax({
 type: "GET",
 url: "https://login." + _sBaseHost + "/cgi-bin/mmwebwx-bin/login?uuid=" + _asUUID + "&tip=" + show_tip,
 dataType: "script",
 cache: false,
 timeout: _nAjaxTimeout,
 success: function(data, textStatus, jqXHR) {
  _logInPage("_poll Request Success, code: " + window.code + ", time: " + (new Date().getTime() - _nTime) + "ms");
 switch (_aoWin.code) {
 case 200:
  _sSecondRequestTime = new Date().getTime() - _sSecondRequestTime;
  _logInPage("Second Request Success, time: " + _sSecondRequestTime + "ms");
 clearTimeout(_oResetTimeout);

  var _fNewLoginFunc = function(){
   $.ajax({
   url: _aoWin.redirect_uri + "&fun=new",//new login page
   type: "GET",
   success:function(msg) {
    _logInPage("new func reponse, reponseMsg: " + msg);
    var code = msg.match(/<script>(.*)<\/script>/);
    var skey=msg.match(/<skey>(.*)<\/skey>/);
    if(code){
    eval(code[1]);
    }else{
    $("#container").show();
    $("#login_container").hide();
    }
    if(skey && skey[1]){
    WebMM.model("account").setSkey(skey[1]);
    }
   },
   error:function(jqXHR, textStatus, errorThrown){
    _nNewLoginFuncErrCount++;
    if(_nNewLoginFuncErrCount > 5){
    if(confirm("Call new login page func error, refresh?")){location.reload()}
    return;
    }
    _reportNow(_aoWin.redirect_uri + " New login page func error: " + textStatus +" retryCount:" + _nNewLoginFuncErrCount);
    setTimeout(_fNewLoginFunc, 500);
   }
   });
  };
  _fNewLoginFunc();

  _reportNow("/cgi-bin/mmwebwx-bin/login, Second Request Success, uuid: " + _asUUID + ", time: " + _sSecondRequestTime + "ms");
 break;

 case 201:
  clearTimeout(_oResetTimeout);
 show_tip = 0;
 $(&#39;.errorMsg&#39;).hide();
 $(&#39;.normlDesc&#39;).hide();
 $(&#39;.successMsg&#39;).show();
  _reportNow("/cgi-bin/mmwebwx-bin/login, First Request Success, uuid: " + _asUUID);
  _reportNow("/cgi-bin/mmwebwx-bin/login, Second Request Start, uuid: " + _asUUID);

  _sSecondRequestTime = new Date().getTime();

  //_nAjaxTimeout = 5 * 1000;
  _self(_asUUID);
  break;

 case 408:
 setTimeout(function(){
 _self(_asUUID);
 }, 500);
 break;

 case 400:
 case 500:
  _reset();
  _afterLoadWebMMDo(function(){
 _aoWin.Log.d("500, Login Poll Svr Exception");
 });
 break;
 }
 },
 error: function(jqXHR, textStatus, errorThrown) {
 if (textStatus == &#39;timeout&#39;) {
  setTimeout(function(){
   _self(_asUUID);
  }, 500);
 } else {
  setTimeout(function(){
   _self(_asUUID);
  }, 5000);

  _logInPage("_poll Request Error:" + textStatus);
  _afterLoadWebMMDo(function(){
   _aoWin.Log.e("Login Poll Error:" + textStatus);
  });
 }
 }
 });
 }

 var getUUIDCount = 0,
 _getUUIDWatchDog,
 _bGetUUIDSuccess = false;//ajax successִ
 function _getUUID() {
 getUUIDCount++;
 var _self = arguments.callee,
  _loadError = function(errorText){
  _reportNow("Load UUID Error! ErrorText: " + errorText + " getUUIDCount=" + getUUIDCount);
  if(getUUIDCount > 5){
   if (confirm("Load uuid error. Refresh?")) {
   location.reload();
   }
  }
  setTimeout(function(){
   _self();
  }, 500);
  };

 clearTimeout(_getUUIDWatchDog);
 _getUUIDWatchDog = setTimeout(function(){
  if(!_aoWin.QRLogin.code){
  _logInPage("GetUUID Timeout, WatchDog Run");
  _self();
  }
 }, 10000);

 $.ajax({
  type: "GET",
  url: "https://login." + _sBaseHost + "/jslogin?appid=wx782c26e4c19acffb&redirect_uri="+encodeURIComponent(location.protocol+"//"+location.host+"/cgi-bin/mmwebwx-bin/webwxnewloginpage")+"&fun=new&lang=" + document.lang,
  dataType: "script",
  cache: false,
  success : function(){
  clearTimeout(_getUUIDWatchDog);
  if(_bGetUUIDSuccess) return;
  if (_aoWin.QRLogin && _aoWin.QRLogin.code == 200) {
   _logInPage("GetUUID Success, UUID=" + QRLogin.uuid);
   _bGetUUIDSuccess = true;

   clearTimeout(_oResetTimeout);
   _oResetTimeout = setTimeout(function(){
   location.reload();//Note: Don&#39;t run _reset(). If you run _reset(), there will may have many _poll request, as they get 408 return code
   }, 5 * 60 *1000);//5 mins

   _loadQRImg(QRLogin.uuid);
  } else {
   var QRLoginCode = (_aoWin.QRLogin && _aoWin.QRLogin.code) ? _aoWin.QRLogin.code : "None";
   _logInPage("GetUUID Error, QRLogin.code=" + QRLoginCode);
   _loadError("QRLogin.code= " + QRLoginCode);
  }
  },
  error : function(xhr, textStatus, errorThrown){
  _logInPage("GetUUID Error, textStatus=" + textStatus);
  _loadError(textStatus);
  }
 });
 }

 function _reset(){
 location.reload();
 }

 if ($("#login_container").is(":visible") ) {
 _getUUID();
 }

 
 var _bHadLog = false;
 function _ossLog() {
 if (_bHadLog) return;
 _bHadLog = true;
 var _sUvid = document.cookie.match(new RegExp( "(^| )"+"webwxuvid"+"=([^;]*)(;|$)"));
 if(!_sUvid || _sUvid.length < 3) return;
 _sUvid = _sUvid[2];
 (new Image()).src = "/cgi-bin/mmwebwx-bin/webwxstatreport?funkey=indexdemo&uvid="+_sUvid+"&uuid="+_sCurUUId;
 }


 if($("img.guide").length > 0) {
 var _nTimer = 0,
 _oGuide$ = $(".guide"),
 _oGuideTrigger$ = $("#guideTrigger, #tipTrigger"),
 _oMask$ = $(".mask");

 function _back() {
 _nTimer = setTimeout(function() {
 _oMask$.stop().animate({opacity:0}, function(){$(".mask").hide()});
 _oGuide$.stop().animate({marginLeft:"-120px",opacity:0}, "400", "swing",function(){
 _oGuide$.hide();
 });
 }, 100);
 }

 /*guide*/
 _oGuide$.css({"left":"50%", "opacity":0});
 _oGuideTrigger$.css({"backgroundColor":"white", "opacity":"0"});
 _oGuideTrigger$.mouseover(function(){
 clearTimeout(_nTimer);
 _oMask$.show().stop().animate({"opacity":0.2});
 _oGuide$.css("display", "block").stop().animate({marginLeft:"+168px", opacity:1}, 900, "swing", function() {
 _oGuide$.animate({marginLeft:"+153px"}, 300);
 });
 _ossLog();
 }).mouseout(_back);

 _oGuide$.mouseover(function(){
 clearTimeout(_nTimer);
 }).mouseout(_back);
 }
})(jQuery, window);

#細讀js之後，你就會從網頁客戶端這邊看到請求登入的一面，網頁客戶端每隔500毫秒就向伺服器發起ssl請求，請求當前的二維碼是否被其他客戶端(手機)授權，如果回傳結果是201，就是說明已經取得掃描二維碼終端相同的帳號登入授權，如果是其他情況就再隔500毫秒再

循環發送請求。這個過程會一直持續到二維碼被掃描通過或是二維碼超時(失效)為止。  【相關推薦】

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