Android™

Get Firebase Access Token from JSON Service Account Private Key

See more Firebase Examples

Demonstrates how to get a Firebase access token using a JSON service account private key. Your Firebase service account can be used to authenticate multiple Firebase features, such as Database, Storage and Auth, programmatically.

A Firebase JSON service account private key can be created in the Firebase settings/admin portion of the console.firebase.google.com site as shown here:

Scroll down to see the example code...

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.

    //  First load the Firebase JSON private key into a string.
    CkFileAccess fac = new CkFileAccess();
    String jsonKey = fac.readEntireTextFile("qa_data/firebase/firebase-chilkat-firebase-adminsdk-n28n4-1b664ee163.json","utf-8");
    if (fac.get_LastMethodSuccess() != true) {
        Log.i(TAG, fac.lastErrorText());
        return;
        }

    //  A Firebase JSON private key should look something like this:

    //  { 
    //    "type": "service_account",
    //    "project_id": "firebase-chilkat",
    //    "private_key_id": "1c664ee164907413c91ddefcf5b765ecba8779e2",
    //    "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvQIBA ... Ya2UZii/lXn73/ZOK8=\n-----END PRIVATE KEY-----\n",
    //    "client_email": "firebase-adminsdk-n28n4@firebase-chilkat.iam.gserviceaccount.com",
    //    "client_id": "134846322329335418431",
    //    "auth_uri": "https://accounts.google.com/o/oauth2/auth",
    //    "token_uri": "https://accounts.google.com/o/oauth2/token",
    //    "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
    //    "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-n28n4%40firebase-chilkat.iam.gserviceaccount.com"
    //  } 
    //  

    CkAuthGoogle gAuth = new CkAuthGoogle();
    gAuth.put_JsonKey(jsonKey);

    //  Choose a scope.
    //  The scope could be "https://www.googleapis.com/auth/firebase.database"
    //  or a space-delimited list of scopes:
    //  "https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email"

    gAuth.put_Scope("https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email");

    //  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) {
        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, "Firebase Access Token: " + gAuth.accessToken());

    //  Save the token to a file (or wherever desired).  This token is valid for 1 hour.
    fac.WriteEntireTextFile("qa_data/tokens/firebaseToken.txt",gAuth.accessToken(),"utf-8",false);

  }

  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."
  }
}