浅析微信扫码登录原理(小结)

// 获取uuid
 getUUID: function() {
  var e = t.defer();
  return window.QRLogin = {},
  $.ajax({
   url: i.API_jsLogin,
   dataType: "script"
  }).done(function() {
   200 == window.QRLogin.code ? e.resolve(window.QRLogin.uuid) : e.reject(window.QRLogin.code)
  }).fail(function() {
   e.reject()
  }),
  e.promise
 }

// 查看扫码状态
checkLogin: function(e, a) {
 var n = t.defer()
  , a = a || 0;
 return window.code = 0,
 window.checkLoginPromise = $.ajax({
  url: i.API_login + "?loginicon=true&uuid=" + e + "&tip=" + a + "&r=" + ~new Date,
  dataType: "script",
  timeout: 35e3
 }).done(function() {
  new RegExp("/" + location.host + "/");
  if (window.redirect_uri && window.redirect_uri.indexOf("/" + location.host + "/") < 0)
   return void (location.href = window.redirect_uri);
  var e = {
   code: window.code,
   redirect_uri: window.redirect_uri,
   userAvatar: window.userAvatar
  };
  n.resolve(e)
 }).fail(function() {
  n.reject()
 }),
 n.promise
}

// 根据服务器返回的扫码状态，进行相应的操作
function o(c) {
 switch (c.code) {
 case 200:
  t.newLoginPage(c.redirect_uri).then(function(t) {
   var o = t.match(/<ret>(.*)<\/ret>/)
    , r = t.match(/<script>(.*)<\/script>/)
    , c = t.match(/<skey>(.*)<\/skey>/)
    , s = t.match(/<wxsid>(.*)<\/wxsid>/)
    , l = t.match(/<wxuin>(.*)<\/wxuin>/)
    , d = t.match(/<pass_ticket>(.*)<\/pass_ticket>/)
    , f = t.match(/<message>(.*)<\/message>/)
    , u = t.match(/<redirecturl>(.*)<\/redirecturl>/);
   return u ? void (window.location.href = u[1]) : o && "0" != o[1] ? (alert(f && f[1] || "登陆失败"),
   i.report(i.AUTH_FAIL_COUNT, 1),
   void location.reload()) : (e.$emit("newLoginPage", {
    Ret: o && o[1],
    SKey: c && c[1],
    Sid: s && s[1],
    Uin: l && l[1],
    Passticket: d && d[1],
    Code: r
   }),
   void (a.getCookie("webwx_data_ticket") || n.report(n.ReportType.cookieError, {
    text: "webwx_data_ticket 票据丢失",
    cookie: document.cookie
   })))
  });
  break;
 case 201:
  e.isScan = !0,
  n.report(n.ReportType.timing, {
   timing: {
    scan: Date.now()
   }
  }),
  t.checkLogin(e.uuid).then(o, function(t) {
   !t && window.checkLoginPromise && (e.isBrokenNetwork = !0)
  });
  break;
 case 408:
  t.checkLogin(e.uuid).then(o, function(t) {
   !t && window.checkLoginPromise && (e.isBrokenNetwork = !0)
  });
  break;
 case 400:
 case 500:
 case 0:
  var s = a.getCookie("refreshTimes") || 0;
  s < 5 ? (s++,
  a.setCookie("refreshTimes", s, .5),
  document.location.reload()) : e.isNeedRefresh = !0;
  break;
 case 202:
  e.isScan = !1,
  e.isAssociationLogin = !1,
  a.setCookie("login_frequency", 0, 2),
  window.checkLoginPromise && (window.checkLoginPromise.abort(),
  window.checkLoginPromise = null ),
  r()
 }
 e.code = c.code,
 e.userAvatar = c.userAvatar,
 a.log("get code", c.code)
}