Android™

Get Google API Access Token using P12 Service Account Key

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

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // --------------------------------------------------------------------------------
    // For a step-by-step guide for setting up your Google Workspace service account,
    // see Setup Google Workspace Account for Sending SMTP GMail from a Service Account
    // --------------------------------------------------------------------------------

    // First load the PKCS12 (.p12 / .pfx) into a PFX object.
    CkPfx pfx = new CkPfx();
    success = pfx.LoadPfxFile("qa_data/pfx/chilkat25-cbd7b42afbd8.p12","notasecret");
    if (success != true) {
        Log.i(TAG, pfx.lastErrorText());
        return;
        }

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

    // The ISS is your service account email address ending in gserviceaccount.com.
    String iss = "chilkatsvc@chilkat25.iam.gserviceaccount.com";

    // The scope is always the following string:
    String scope = "https://mail.google.com/";

    // The sub is your company email address
    String oauth_sub = "info@chilkat.xyz";

    // The access token is valid for this number of seconds.
    int numSec = 3600;

    gAuth.put_EmailAddress(iss);
    gAuth.put_Scope(scope);
    gAuth.put_ExpireNumSeconds(numSec);
    gAuth.put_SubEmailAddress(oauth_sub);

    // Connect to www.googleapis.com
    CkSocket tlsSock = new CkSocket();
    success = tlsSock.Connect("www.googleapis.com",443,true,5000);
    if (success != true) {
        Log.i(TAG, tlsSock.lastErrorText());
        return;
        }

    // Send the request to obtain the access token.
    success = gAuth.ObtainAccessToken(tlsSock);
    if (success != true) {
        Log.i(TAG, gAuth.lastErrorText());
        return;
        }

    // Examine the access token:
    Log.i(TAG, "Access Token: " + gAuth.accessToken());

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}