我正在尝试将 Xamarin.Auth 与Xamarin Google-API一起使用来登录 Google 并访问云端硬盘。我已经设法让几乎所有东西都正常工作,但身份验证令牌似乎在大约一个小时后过期。一切正常工作了一段时间,但大约一个小时后,当我尝试访问时,我得到一个 Invalid Credentials [401] 错误和泄漏:
Google.Apis.Requests.RequestError
Invalid Credentials [401]
Errors [
Message[Invalid Credentials] Location[Authorization - header] Reason[authError] Domain[global]
]
: GoogleDriveAgent: FetchRemoteFileList() Failed! with Exception: {0}
[0:] Google.Apis.Requests.RequestError
Invalid Credentials [401]
Errors [
Message[Invalid Credentials] Location[Authorization - header] Reason[authError] Domain[global]
]
: GoogleDriveAgent: FetchRemoteFileList() Failed! with Exception: {0}
objc[37488]: Object 0x7f1530c0 of class __NSDate autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug
objc[37488]: Object 0x7f151e50 of class __NSCFString autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug
//...more leaks.
我想确保按预期使用 Xamarin.Auth 和 Google API,所以这是我的代码:
在我的 GoogleDriveService 课程中,我有一个帐户商店和一个已保存的帐户:
AccountStore Store {
get {
if (m_store == null)
m_store = AccountStore.Create ();
return m_store;
}
}
Account SavedAccount {
get {
var savedAccounts = Store.FindAccountsForService ("google");
m_savedAccount = (savedAccounts as List<Account>).Count > 0 ? (savedAccounts as List<Account>) [0] : null;
return m_savedAccount;
}
}
我初始化一个会话并启动服务:
void InitializeSession ()
{
Authenticator = new GoogleAuthenticator (ClientID, new Uri (RedirectUrl), GoogleDriveScope);
Authenticator.Completed += HandleAuthenticationCompletedEvents;
if (SavedAccount != null) {
Authenticator.Account = SavedAccount;
StartService ();
}
UpdateSignInStatus ();
}
bool StartService ()
{
try {
Service = new DriveService (Authenticator);
return true;
} catch (Exception ex) {
// Log exception
return false;
}
}
...并响应身份验证完成事件:
void HandleAuthenticationCompletedEvents (object sender, AuthenticatorCompletedEventArgs e)
{
if (e.IsAuthenticated) { // Success
UpdateSignInStatus();
Store.Save (e.Account, "google");
Authenticator.Account = e.Account;
StartService();
LoginController.DismissViewController(true, null);
} else { // Cancelled or no success
UpdateSignInStatus();
LoginController.DismissViewController(true, null);
LoginController = null;
InitializeSession (); // Start a new session
}
}
再次,一切正常,一段时间,但随后身份验证过期。我知道它应该,但我认为保存在 AccountStore 中的凭据应该仍然有效。
在Xamarin.Auth 入门文档中,它说再次调用 Save 将覆盖凭据,并且“这对于使存储在帐户对象中的凭据过期的服务很方便。” 听起来很有希望...
所以我尝试了另一种方法:拥有一个始终覆盖 getter 中的凭据的 IsSignedIn 属性......
public bool IsSignedIn {
get {
if (Authenticator == null) {
m_isSignedIn = false;
return m_isSignedIn;
}
if (Authenticator.Account != null) {
Store.Save (Authenticator.Account, "google"); // refresh the account store
Authenticator.Account = SavedAccount;
m_isSignedIn = StartService ();
} else {
m_isSignedIn = false;
}
return m_isSignedIn;
}
}
...然后我在任何 API 调用(获取元数据、下载等)之前访问 IsSignedIn。它不起作用:我仍然收到上面显示的过期凭据错误。
这是需要刷新令牌的情况吗?我究竟做错了什么?