Get access token for gmail api via objective-c

Question

I used the code from this sample. To get the number of user's unread messages (that's what I need), I need to send this GET request

https://www.googleapis.com/gmail/v1/users/me/labels/UNREAD?key={MY_API_KEY}

like in this example. But I guess that the {ACCESS_TOKEN} should be here instead of {MY_API_KEY}. If so, could anybody tell me how to get the access token using AFNetworking or auth from the sample?

Answer 1

To get the access token to make an authorize request to the Google API you should implement the following methods:

- (GTMOAuth2ViewControllerTouch *)createAuthController {
GTMOAuth2ViewControllerTouch *authController;
// If modifying these scopes, delete your previously saved credentials by
// resetting the iOS simulator or uninstall the app.
NSArray *scopes = [NSArray arrayWithObjects:kGTLAuthScopeGmailReadonly, nil];
authController = [[GTMOAuth2ViewControllerTouch alloc]
                  initWithScope:[scopes componentsJoinedByString:@" "]
                  clientID:kClientID
                  clientSecret:nil
                  keychainItemName:kKeychainItemName
                  delegate:self
                  finishedSelector:@selector(viewController:finishedWithAuth:error:)];
return authController;
}


- (void)viewController:(GTMOAuth2ViewControllerTouch *)viewController
  finishedWithAuth:(GTMOAuth2Authentication *)authResult
             error:(NSError *)error {
if (error != nil) {
   ...
}
else {
    NSLog(@"Access token: %@", authResult.accessToken);

 }
}

And your ViewDidAppear method should looks like this:

- (void)viewDidAppear:(BOOL)animated {
if (!self.service.authorizer.canAuthorize) {
    // Not yet authorized, request authorization by pushing the login UI onto the UI stack.
    [self presentViewController:[self createAuthController] animated:YES completion:nil];
}

That code output the target access token.