Which Google api to use for getting user's first name, last name, picture, etc?

Question

I have the oauth authorization with google working correctly and am getting data from the contacts api. Now, I want to programmatically get a gmail user's first name, last name and picture. Which google api can i use to get this data?

Answer 1

The contacts API perhaps works, but you have to request permission from the user to access all contacts. If I were a user, that would make me wary of granting the permission (because this essentially gives you permission to spam all my contacts...)

I found the response here to be useful, and only asks for "basic profile information":

Get user info via Google API

I have successfully used this approach, and can confirm it returns the following Json object:

{
  "id": "..."
  "email": "...",
  "verified_email": true,
  "name": "....",
  "given_name": "...",
  "family_name": "...",
  "link": "...",
  "picture": "...",
  "gender": "male",
  "locale": "en"
}

Answer 2

Use this code to get firstName and lastName of a google user:

final HttpTransport transport = new NetHttpTransport();
final JsonFactory jsonFactory = new JacksonFactory();
GoogleIdTokenVerifier verifier = new GoogleIdTokenVerifier.Builder(transport, jsonFactory)
        .setAudience(Arrays.asList(clientId))
        .setIssuer("https://accounts.google.com")
        .build();

GoogleIdToken idToken = null;
try {
    idToken = verifier.verify(googleAuthenticationPostResponse.getId_token());
} catch (GeneralSecurityException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}
GoogleIdToken.Payload payload = null;
if (idToken != null) {
    payload = idToken.getPayload();
}
String firstName = payload.get("given_name").toString();
String lastName = payload.get("family_name").toString();