iOS：谷歌验证码

Question

我正在与验证用户身份以使用与他关联的谷歌帐户。问题是，每次用户通过我的应用程序登录时，“允许访问”总是出现在 Google 的身份验证视图上，即使我在之前的测试中已经单击了“允许访问”。这是正常现象还是我的代码写错了？请帮助我。

我使用以下代码进行登录和退出：

- (IBAction)signIn:(id)sender {
    if(!isSignedIn){
        [self signOutFromAll];

        NSString *keychainItemName = nil;

        // save keychain
        keychainItemName = kKeychainItemName;

        NSString *scope = @"https://www.googleapis.com/auth/plus.me";

        NSString *clientID = kClientID;
        NSString *clientSecret = kClientSecret;

        SEL finishedSel = @selector(viewController:finishedWithAuth:error:);

        GTMOAuth2ViewControllerTouch *viewController;
        viewController = [GTMOAuth2ViewControllerTouch controllerWithScope:scope 
                                                                  clientID:clientID 
                                                              clientSecret:clientSecret 
                                                          keychainItemName:keychainItemName 
                                                                  delegate:self 
                                                          finishedSelector:finishedSel];

        [[self navigationController]pushViewController:viewController animated:YES]; 
    } else {
        [self displayAlertWithMessage:@"Currently Signed in."];
    } }

- (IBAction)signOut:(id)sender {
    [self signOutFromAll];
    [self displayAlertWithMessage:@"Signed out."]; }

这是用于委托的：

- (void)viewController:(GTMOAuth2ViewControllerTouch *)viewController 
      finishedWithAuth:(GTMOAuth2Authentication *)auth 
                 error:(NSError *)error{
    if(error != nil){
        // Authentication failed...
        NSLog(@"Authentication error: %@", error);
        NSData *responseData = [[error userInfo] objectForKey:@"data"];
        if([responseData length] > 0)
            NSLog(@"%@", [[[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding]autorelease]);
        self.auth = nil;
    } else {
        // Authentication succeeded...
        isSignedIn = YES;
        self.auth = auth;
    }
}

和awakeFromNib：

- (void)awakeFromNib{
    // Fill in the Client ID and Client Secret text fields
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    // First, we'll try to get the saved Google authentication, if any, from the keychain
    // Normal applications will hardcode in their client ID and client secret,
    // But the sample app allows the user to enter them in a text field, and saves them in the preferences
    NSString *clientID      = [defaults stringForKey:kGoogleClientIDKey];
    NSString *clientSecret  = [defaults stringForKey:kGoogleClientSecretKey];

    GTMOAuth2Authentication *auth;

    auth = [GTMOAuth2ViewControllerTouch authForGoogleFromKeychainForName:kKeychainItemName
                                                                 clientID:clientID
                                                             clientSecret:clientSecret];

    if (auth.canAuthorize) {
        // There is saved google authentication
        // self.serviceSegments.selectedSegmentIndex = 0;
    } 

    // Save the authentication object, which holds the auth tokens
    self.auth = auth;

    [self setAuth:auth];
    isSignedIn = self.auth.canAuthorize;
}

顺便说一句，我对这些代码的参考位于此链接上：http://code.google.com/p/gtm-oauth2/wiki/Introduction#Using_the_OAuth_2_Controllers

Answer 1

来自文档：

钥匙串项名称用于将令牌保存在用户的钥匙串上，并且应标识您的应用程序名称和服务名称。如果 keychainItemName 为 nil，则不会保存令牌，用户下次运行应用程序时必须重新登录。

http://code.google.com/p/gtm-oauth2/wiki/Introduction

因此，从您的代码来看，这取决于 kKeychainItemName 的设置。

只是想在阅读文档时对此发表评论。

Answer 2

当您将 oauth 对象保存到钥匙串中时，请使用此方法

[GTMOAuth2ViewControllerTouch saveParamsToKeychainForName:YOUR_KEYCHAIN_ITEM_NAME authentication:auth];

，并且

在调用 api 之前，只需使用此方法检查并检索 oauth 对象

GTMOAuth2Authentication * auth = [GTMOAuth2ViewControllerTouch
                                      authForGoogleFromKeychainForName:YOUR_KEYCHAIN_ITEM_NAME
                                      clientID:GOOGLE_CLIENT_KEY
                                      clientSecret:GOOGLE_CLIENT_SECRET];

，并使用此方法确保它的 oauth 对象是真实的

if(![GTMOAuth2ViewControllerTouch authorizeFromKeychainForName:YOUR_KEYCHAIN_ITEM_NAME authentication:auth])

Answer 3

我知道这是一个老问题，但我遇到了同样的问题，所以我正在编写我的解决方案，它可能会在将来帮助其他人。

事实证明，仅设置 self.auth 是不够的，您还需要设置 self.analyticsService.authorizer 变量

if ([self.auth canAuthorize])
{
    self.analyticsService.authorizer = self.auth;
    [self getAnalyticsData];
    return;
}

这对我来说是成功的，用户不再是要求输入凭据。

Answer 4

Put the below code to logout / sign out from Google SDK.

- Call below function from where you want:

static NSString *const kKeychainItemName = @"MY_APP";



- (void)logoutFromGoogleDrive {

[GTMOAuth2SignIn revokeTokenForGoogleAuthentication:(GTMOAuth2Authentication *)self.driveService.authorizer];

[GTMOAuth2ViewControllerTouch saveParamsToKeychainForName:kKeychainItemName authentication:nil];

}

[Note: Above code works, if you have used GTMOAuth2SignIn  for sign in user for google access like,

GTMOAuth2Authentication * auth = [GTMOAuth2ViewControllerTouch
authForGoogleFromKeychainForName:YOUR_KEYCHAIN_ITEM_NAME
clientID:GOOGLE_CLIENT_KEY
clientSecret:GOOGLE_CLIENT_SECRET];

]

Answer 5

根据我的经验，这种行为是正常的。

您是否有疑问，因为 Facebook 仅询问用户一次，如果用户想要授予应用程序访问用户个人资料的权限？