Question

我们已经有一个登录模块使用Google Sign-In sdk。登录成功后，Google登录会提供GIDAuthentication个对象。

现在我想使用google drive sdk访问用户的google驱动器，这需要GTMOAuth2Authentication来提供身份验证信息。那么我可以使用GIDAuthentication为驱动程序sdk构建GTMOAuth2Authentication吗？

手动分配accessToken值似乎不起作用（添加了驱动器范围）。

Answer 1

是的，你可以！

使用以下步骤：

按照以下所述添加Google SignIn的所有步骤：https://developers.google.com/identity/sign-in/ios/start-integrating。确保为项目启用Google Drive API。

初始化登录对象时，请不要忘记添加Google云端硬盘API范围：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Initialize sign-in
    var configureError: NSError?
    GGLContext.sharedInstance().configureWithError(&configureError)
    assert(configureError == nil, "Error configuring Google services: \(configureError)")

    GIDSignIn.sharedInstance().delegate = self

    // Use here whatever auth scope you wish (e.g., kGTLAuthScopeDriveReadonly, 
    // kGTLAuthScopeDriveMetadata, etc..)
    // You can obviously append more scopes to allow access to more services,
    // other than Google Drive.
    GIDSignIn.sharedInstance().scopes.append(kGTLAuthScopeDrive)

    return true
}

在AppDelegate（或其他可访问的地方）中，添加：
```
var myAuth: GTMFetcherAuthorizationProtocol? = nil
```

在signIn委托函数中（假设此处也在AppDelegate中设置），添加以下代码：

func signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!, withError error: NSError!) {
    if (error == nil) {
        // Logged into google services successfully! 
        // Save relevant details from user.authentication to refresh the token when needed.      

        // Set GTMOAuth2Authentication authoriser for your Google Drive service
        myAuth = user.authentication.fetcherAuthorizer()
    } else {
        // Error signing into Google services
    }
}

最后，无论您在何处设置GoogleServiceDrive，您都可以设置其授权人，只需设置：

let service = GTLServiceDrive()
service.authorizer = (UIApplication.sharedApplication().delegate as! AppDelegate).myAuth

现在您可以使用Google的示例代码

if let authorizer = service.authorizer, canAuth = authorizer.canAuthorize where canAuth {
    // service is authorised and can be used for queries
} else {
    // service is not authorised 
}

Answer 2

/ Creates the auth controller for authorizing access to Google Drive.
- (GTMOAuth2ViewControllerTouch *)createAuthController
{
    GTMOAuth2ViewControllerTouch *authController;
    authController = [[GTMOAuth2ViewControllerTouch alloc] initWithScope:@"https://www.googleapis.com/auth/drive"
                                                                clientID:kClientID
                                                            clientSecret:kClientSecret
                                                        keychainItemName:kKeychainItemName
                                                                delegate:self
                                                        finishedSelector:@selector(viewController:finishedWithAuth:error:)];
    return authController;
}

// Handle completion of the authorization process, and updates the Drive service
// with the new credentials.
- (void)viewController:(GTMOAuth2ViewControllerTouch *)viewController
      finishedWithAuth:(GTMOAuth2Authentication *)authResult
                 error:(NSError *)error
{
    if (error != nil)
    {
        [self showAlert:@"Authentication Error" message:error.localizedDescription];
        self.driveService.authorizer = nil;
    }
    else
    {
        self.driveService.authorizer = authResult;
        [self.navigationController dismissViewControllerAnimated:YES completion:nil];
    }
}-(void)loadDriveFiles
{
    NSMutableArray *driveFiles = [[NSMutableArray alloc] init];
    NSMutableArray *downloadFiles = [[NSMutableArray alloc] init];

    GTLQueryDrive *query = [GTLQueryDrive queryForFilesList];
    query.q = [NSString stringWithFormat:@"'%@' IN parents", @"root"];
    [self.driveService executeQuery:query completionHandler:^(GTLServiceTicket *ticket,
                                                              GTLDriveFileList *files,
                                                              NSError *error) {
        if (error == nil)
        {
            for(id key in files.items) {
                NSString *titleStr = [key valueForKey:@"title"];
                [driveFiles addObject:titleStr];

                NSString *downloadStr = [key valueForKey:@"downloadUrl"];
                [downloadFiles addObject:downloadStr];
            }
            UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
            FilesViewController *filesView = (FilesViewController *)[storyboard instantiateViewControllerWithIdentifier:@"filesView"];
            [filesView initwithName:driveFiles anddownload:downloadFiles];
            [self.navigationController pushViewController:filesView animated:YES];
        }
        else
        {
            NSLog(@"An error occurred: %@", error);
        }
    }];
}

我可以使用google drive sdk和iOS上的google登录sdk的身份验证信息吗？

2 个答案: