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copied!<p>I have found the answer. Initially I was using the Client ID for an installed application. This did not give the option to set up the Redirect URI. It gave a default Redirect URI of <strong>urn:ietf:wg:oauth:2.0:oob <a href="http://localhost" rel="nofollow noreferrer">http://localhost</a>.</strong> So when I sent a request for authentication using this code:</p> <pre><code>viewController = [GTMOAuth2ViewControllerTouch controllerWithScope:scope clientID:clientID clientSecret:clientSecret keychainItemName:nil delegate:self finishedSelector:finishedSel]; </code></pre> <p>It returned an success code that is then used to authorize native applications. Please reffer <a href="http://code.google.com/apis/accounts/docs/OAuth2.html" rel="nofollow noreferrer">here</a> for more on returned codes or tokens.</p> <p>To fix my issue I went ahead and used a Client ID for web application. This allowed me to explicitly set a Redirect URI and also allowed me to set the response_type to token instead of code here: </p> <pre><code>https://accounts.google.com/o/oauth2/auth? client_id=21302922996.apps.googleusercontent.com& redirect_uri=https://www.example.com/back& scope=https://www.google.com/m8/feeds/& response_type=**token** </code></pre> <p>So when I am authenticated and the redirect_uri is served back from the server it comes with an "access_tocken" appended as a query string like this:</p> <pre><code>https://www.example.com/back?access_token=returned_access_tocken </code></pre> <p>Now you can use a regular expression code:</p> <pre><code>-(void)checkForAccessToken:(NSString *)urlString { NSError *error; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"access_token=(.*)&" options:0 error:&error]; if (regex != nil) { NSTextCheckingResult *firstMatch = [regex firstMatchInString:urlString options:0 range:NSMakeRange(0, [urlString length])]; if (firstMatch) { NSRange accessTokenRange = [firstMatch rangeAtIndex:1]; NSString *accessToken = [urlString substringWithRange:accessTokenRange]; accessToken = [accessToken stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; [_delegate accessTokenFoundGoogle:accessToken]; accessTokenFound = YES; } } } </code></pre> <p>to pluck the access_code and use it for your authorization request here:</p> <pre><code>"https://www.googleapis.com/oauth2/v1/userinfo?oauth_token=put_your_accesstoken_here" to send a request for authorization </code></pre> <p>Then you can just send your request and get back in this case the user's profile info in JSON format. You can refer to this <a href="https://stackoverflow.com/questions/3498631/starting-out-with-an-application-for-facebook-connect-on-the-iphone">question and answer</a> for using Facebook's graph api to login users. Then just modify the code to work with the new Google OAuth 2.0 using the suggestions and request urls I have included here. Just a suggestion to speed things for you when converting the code for Facebook, create a new init method like this:</p> <pre><code>- (id)initWithDelegate:(id<GoogleLoginDialogDelegate>)delegate; - (id)initWithDelegate:(id<GoogleLoginDialogDelegate>)delegate { if ((self = [super initWithNibName:@"GoogleLoginDialog" bundle:[NSBundle mainBundle]])) { self.delegate = delegate; } return self; } </code></pre> <p>So that you can easly work with the delegate methods from your Google login dialog. If you follow the Facebook example carefully, you should have Google login with OAuth working great!</p>

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