java - GMail REST API: Using Google Credentials Without Impersonate

Question

Is it possible to use Google Credentials for GMAIL REST API without using impersonation??

In many examples of GMAIL REST API i see is mandatory to use an impersonation account associated to a domain and Google APPS. I just want to use GMAIL REST API api server-to-server :

f.e:

GoogleCredential  credential = new GoogleCredential.Builder().setTransport(httpTransport)
            .setJsonFactory(jsonFactory)
                         .setServiceAccountId(serviceAccountUserEmail)
                         **.setServiceAccountUser("[email protected])**
                         .setServiceAccountScopes(SCOPES)
                         .setServiceAccountPrivateKeyFromP12File(
                         new java.io.File(SERVICE_ACCOUNT_PKCS12_FILE_PATH))                                
                        .build();

The matter is that i don't have any domain and i use just a GMAIL account...but i don't get any way to authorize, for example : [email protected]

The servive acccount id [email protected]"; is a "client account" created with the [email protected]

This has no sense , i don't want to impersonate with no other account of another domain, and i don't get any way to authozize [email protected] .

Just only works, if you have an account to impersonate of other domain associated with Google Apps, and to get Google Apps...you need a domain.

Any advise??

Answer 1

You may just want to simply use OAuth 2.0 for Web Server Applications. Assuming you want the authorization for more than an hour, you can use refresh tokens.