idToken
是JSON Web令牌(JWT),所以元数据是可读的。要查看这看起来像什么,请将您的令牌粘贴到jwt.io中,然后查看格式是什么。
例如,借此JWT:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiZXhwIjoiMTUwNDc1MzQ0NSIsImFkbWluIjp0cnVlfQ.ggeW2vGcdWKNWmICRfTZ8qcBOQlu38DzaO8t_6aNuHQ
它被分成3个部分:报头,有效载荷和签名。到期在有效载荷部分。
我们只需要base64解码这个。
let jwt = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvbiBTbm93IiwiZXhwIjoiMTUwNDc1MzQ0NSIsImFkbWluIjp0cnVlfQ.aCiqyVAAmHizPshrcdy8jwgHvBg4Diz2YY2e1INjoPg"
// get the payload part of it
var payload64 = jwt.components(separatedBy: ".")[1]
// need to pad the string with = to make it divisible by 4,
// otherwise Data won't be able to decode it
while payload64.count % 4 != 0 {
payload64 += "="
}
print("base64 encoded payload: \(payload64)")
let payloadData = Data(base64Encoded: payload64,
options:.ignoreUnknownCharacters)!
let payload = String(data: payloadData, encoding: .utf8)!
print(payload)
此打印出:
{"sub":"1234567890","name":"Jon Snow","exp":"1504753445","admin":true}
的exp
是您的到期日。你可以通过这个开了一个JSON序列来获得日期:
let json = try! JSONSerialization.jsonObject(with: payloadData, options: []) as! [String:Any]
let exp = json["exp"] as! Int
let expDate = Date(timeIntervalSince1970: TimeInterval(exp))
非常感谢,这有助于! – Alienbash