未來在同一頁面內調用Firebase將使用相同的身份驗證。來自文檔:
對任何引用進行身份驗證都會將該客戶端認證爲整個Firebase,如果Firebase的互聯網連接丟失,Firebase將再次無縫處理認證,因此您只需在應用中執行一次操作即可。要更改客戶端的憑據(例如,當用戶登錄到其他帳戶時),只需使用新令牌重新進行身份驗證即可。
var ref = new Firebase(URL);
ref.on('value', ...) // not authenticated
ref.auth(TOKEN, function(error) {
if(!error) {
ref.on('value', ...); //authenticated
ref.child('...').on('value', ...); //also authenticated
new Firebase(URL); // also authenticated if I'm using the same URL
}
});
ref.on('value', ...); // probably not authenticated (async call to auth probably not completed)
如果你想要這個令牌生存頁面重新加載,那麼你需要將其存儲在某種方式使客戶可以在新的頁面上調用firebaseRef.auth(...)。
var ref = new Firebase(URL);
// fetch a token stored in localStorage on a previous page load
var token = localStorage.getItem('token');
if(!token || !tokenHasTimeLeft(token)) {
token = fetchTokenFromServer(); /* some API call to your custom auth server */-
}
login(token);
function login(token) {
ref.auth(token, function(error) {
/** handle errors */
localStorage.setItem('token', token); // store for future page loads
});
}
// this method uses Base64.decode by Fred Palmer
// https://code.google.com/p/javascriptbase64/
// it checks to see if the token stored has more
// than 12 hours left before it expires
function tokenHasTimeLeft(tok) {
try {
var body = JSON.parse(Base64.decode(tok.split('.')[1]));
var exp = body.exp? moment.unix(body.exp) : moment.unix(body.iat).add('hours', 24);
DEVMODE && console.log('parsed token', body);
return exp.diff(moment(), 'hours') > 12;
}
catch(e) {
console.warn(e);
return false;
}
}