(Java) Get Google API Access Token using P12 Service Account Key

Demonstrates how to get a Google API access token using a P12 service account key.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // First load the PKCS12 (.p12 / .pfx) into a PFX object.
    CkPfx pfx = new CkPfx();
    boolean success = pfx.LoadPfxFile("qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12","notasecret");
    if (success != true) {
        System.out.println(pfx.lastErrorText());
        return;
        }

    CkAuthGoogle gAuth = new CkAuthGoogle();
    success = gAuth.SetP12(pfx);

    // Set the client email address.
    gAuth.put_EmailAddress("pip-563@chilkatcloud.iam.gserviceaccount.com");

    // Choose a scope.
    gAuth.put_Scope("https://www.googleapis.com/auth/cloud-platform");

    // Request an access token that is valid for this many seconds.
    gAuth.put_ExpireNumSeconds(3600);

    // If the application is requesting delegated access:
    // The email address of the user for which the application is requesting delegated access,
    // then set the email address here. (Otherwise leave it empty.)
    gAuth.put_SubEmailAddress("");

    // Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
    // The Chilkat socket object is used so that the connection can be established
    // through proxies or an SSH tunnel if desired.
    CkSocket tlsSock = new CkSocket();
    success = tlsSock.Connect("www.googleapis.com",443,true,5000);
    if (success != true) {
        System.out.println(tlsSock.lastErrorText());
        return;
        }

    // Send the request to obtain the access token.
    success = gAuth.ObtainAccessToken(tlsSock);
    if (success != true) {
        System.out.println(gAuth.lastErrorText());
        return;
        }

    // Examine the access token:
    System.out.println("Access Token: " + gAuth.accessToken());
  }
}