Using Google+ iOS API how to get logged in user's profile details?

Question

I've managed to successfully log in to google plus from an iPhone app. But how to get logged in user's details? such as profile id, email etc.

I tried this, Stackoverflow answer for a similar question but I was unable to get it working. In that sample what exactly is being passed to accessTocken here,

NSString *str =  [NSString stringWithFormat:@"https://www.googleapis.com/oauth2/v1/userinfo?access_token=%@",accessTocken];

I've implemented that code in - (void)finishedWithAuth: (GTMOAuth2Authentication *)auth error: (NSError *) error { } method. however auth.accessToken returns a null value.

so I can not use auth.accessToken to append that URL. Is there any other way to get this done?

Answer 1

First, follow this instructions to setup your project in Google API Console (and to download configuration file GoogleService-Info.plist) and to integrate the latest GoogleSignIn SDK
into your project: Integration Guide

A piece of code.

Here is the code for getting user info with the latest version of GoogleSignIn SDK at this moment.

#import <GoogleSignIn/GoogleSignIn.h>
//...

@interface ViewController() <GIDSignInDelegate, GIDSignInUIDelegate>
//...

- (IBAction)googleSignInTapped:(id)sender {
    [GIDSignIn sharedInstance].clientID = kClientId;// Replace with the value of CLIENT_ID key in GoogleService-Info.plist
    [GIDSignIn sharedInstance].delegate = self;
    [GIDSignIn sharedInstance].shouldFetchBasicProfile = YES; //Setting the flag will add "email" and "profile" to scopes. 

    NSArray *additionalScopes = @[@"https://www.googleapis.com/auth/contacts.readonly",
                                  @"https://www.googleapis.com/auth/plus.login",
                                  @"https://www.googleapis.com/auth/plus.me"];

    [GIDSignIn sharedInstance].scopes = [[GIDSignIn sharedInstance].scopes arrayByAddingObjectsFromArray:additionalScopes];

    [[GIDSignIn sharedInstance] signIn];
}

#pragma mark - GoogleSignIn delegates
- (void)signIn:(GIDSignIn *)signIn didSignInForUser:(GIDGoogleUser *)user withError:(NSError *)error {
    if (error) {
        //TODO: handle error
    } else {
        NSString *userId   = user.userID;
        NSString *fullName = user.profile.name;
        NSString *email    = user.profile.email;
        NSURL *imageURL    = [user.profile imageURLWithDimension:1024];
        NSString *accessToken = user.authentication.accessToken; //Use this access token in Google+ API calls.

        //TODO: do your stuff 
    }
}

- (void)signIn:(GIDSignIn *)signIn didDisconnectWithUser:(GIDGoogleUser *)user withError:(NSError *)error {
    // Perform any operations when the user disconnects from app here.
}

- (void)signIn:(GIDSignIn *)signIn presentViewController:(UIViewController *)viewController {
    [self presentViewController:viewController animated:YES completion:nil];
}

// Dismiss the "Sign in with Google" view
- (void)signIn:(GIDSignIn *)signIn dismissViewController:(UIViewController *)viewController {
    [self dismissViewControllerAnimated:YES completion:nil];
}

Your AppDelegate.m

#import <GoogleSignIn/GoogleSignIn.h>
//...
@implementation AppDelegate

//...
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //...
    return YES;
}

//For iOS 9.0 and later
- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary *)options {
    //...
    return [[GIDSignIn sharedInstance] handleURL:url
                               sourceApplication:options[UIApplicationOpenURLOptionsSourceApplicationKey]
                                      annotation:options[UIApplicationOpenURLOptionsAnnotationKey]];
}

//For your app to run on iOS 8 and older, 
- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url sourceApplication:(nullable NSString *)sourceApplication annotation:(nonnull id)annotation {
    //...
    return [[GIDSignIn sharedInstance] handleURL:url
                               sourceApplication:sourceApplication
                                      annotation:annotation];
}

@end

Also make sure that you've added URL Scheme with your REVERSED_CLIENT_ID which you can find in GoogleService-Info.plist.

---

To be able to get list of your connections in Google+ you need to enable Google People API and Google+ API for your project in Google API Console.

Then just send HTTP request to the following url: https://www.googleapis.com/plus/v1/people/me/people/visible?access_token=YOUR_ACCESS_TOKEN

---

To check if user has a Google+ profile just send HTTP request to the following url: https://www.googleapis.com/plus/v1/people/USER_ID?access_token=YOUR_ACCESS_TOKEN and check the value of "isPlusUser" which will be "true" or "false"

Little bonus
EXAMPLE PROJECT

Answer 2

- (void)finishedWithAuth:(GTMOAuth2Authentication *)auth error:(NSError *)error {
    NSLog(@"Received Error %@ and auth object==%@", error, auth);

    if (error) {
        // Do some error handling here.
    } else {
        [self refreshInterfaceBasedOnSignIn];

        GTLQueryPlus *query = [GTLQueryPlus queryForPeopleGetWithUserId:@"me"];

        NSLog(@"email %@ ", [NSString stringWithFormat:@"Email: %@",[GPPSignIn sharedInstance].authentication.userEmail]);
        NSLog(@"Received error %@ and auth object %@",error, auth);

        // 1. Create a |GTLServicePlus| instance to send a request to Google+.
        GTLServicePlus* plusService = [[GTLServicePlus alloc] init] ;
        plusService.retryEnabled = YES;

        // 2. Set a valid |GTMOAuth2Authentication| object as the authorizer.
        [plusService setAuthorizer:[GPPSignIn sharedInstance].authentication];

        // 3. Use the "v1" version of the Google+ API.*
        plusService.apiVersion = @"v1";
        [plusService executeQuery:query
                completionHandler:^(GTLServiceTicket *ticket,
                                    GTLPlusPerson *person,
                                    NSError *error) {
            if (error) {
                //Handle Error
            } else {
                NSLog(@"Email= %@", [GPPSignIn sharedInstance].authentication.userEmail);
                NSLog(@"GoogleID=%@", person.identifier);
                NSLog(@"User Name=%@", [person.name.givenName stringByAppendingFormat:@" %@", person.name.familyName]);
                NSLog(@"Gender=%@", person.gender);
            }
        }];
    }
}

Hope, this will help you

Answer 3

This is the easiest and the simplest way of fetching the current logged in user's email id first create an instance variable of GPPSignIn class

GPPSignIn *signIn;

then initialize it in the viewDidLoad

- (void)viewDidLoad
 {
 [super viewDidLoad];

  static NSString * const kClientID = @"your client id";
  signIn = [GPPSignIn sharedInstance];
  signIn.clientID= kClientID;
  signIn.scopes= [NSArray arrayWithObjects:kGTLAuthScopePlusLogin, nil];
  signIn.shouldFetchGoogleUserID=YES;
  signIn.shouldFetchGoogleUserEmail=YES;
  signIn.delegate=self;

 }

next implement the GPPSignInDelegate in your view controller here you can get the logged in user's email id

 - (void)finishedWithAuth:(GTMOAuth2Authentication *)auth
           error:(NSError *)error
 {  
  NSLog(@"Received Access Token:%@",auth);
  NSLog(@"user google user id  %@",signIn.userEmail); //logged in user's email id
 }