(Android™) Decode Microsoft Graph ID Token

Demonstrates how to decode a Microsoft Graph ID token.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// 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);

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

    // In a previous example, we obtained a Microsoft Graph OAuth2 access token.
    // This example loads the JSON saved from the previous example and decodes the id_token.

    // Our Microsoft Graph OAuth2 token looks like this:

    // {
    //   "token_type": "Bearer",
    //   "scope": "openid profile User.ReadWrite Mail.ReadWrite Mail.Send Files.ReadWrite User.Read Calendars.ReadWrite Group.ReadWrite.All",
    //   "expires_in": 3600,
    //   "ext_expires_in": 3600,
    //   "access_token": "EwCQA8l6...0HhMKYwC",
    //   "refresh_token": "MCWulIvzi2yD0S...igEFn51mqcByhZtAJg",
    //   "id_token": "eyJ0eXAiOiJKV1...Q7lRDaR-7A",
    //   "expires_on": "1562862714"
    // }

    CkJsonObject jsonToken = new CkJsonObject();
    boolean success = jsonToken.LoadFile("qa_data/tokens/microsoftGraph.json");
    if (success == false) {
        Log.i(TAG, "Failed to load the JSON file...");
        return;
        }

    // Use Chilkat's JWT API to examine the id_token..
    CkJwt jwt = new CkJwt();
    String idToken = jsonToken.stringOf("id_token");

    // Extract the JOSE header..
    String jose = jwt.getHeader(idToken);

    CkJsonObject jsonHeader = new CkJsonObject();
    jsonHeader.Load(jose);
    jsonHeader.put_EmitCompact(false);
    Log.i(TAG, jsonHeader.emit());

    // The JOSE header looks like this:

    // {
    //   "typ": "JWT",
    //   "alg": "RS256",
    //   "kid": "1LTMzakihiRla_8z2BEJVXeWMqo"
    // }

    String claims = jwt.getPayload(idToken);

    CkJsonObject jsonClaims = new CkJsonObject();
    jsonClaims.Load(claims);
    jsonClaims.put_EmitCompact(false);
    Log.i(TAG, jsonClaims.emit());

    // The claims look like this:

    // {
    //   "ver": "2.0",
    //   "iss": "https://login.microsoftonline.com/9188040d-6c67-4c5b-b112-36a304b66dad/v2.0",
    //   "sub": "AAAAAAAAAAAAAAAAAAAAAHJFryd6Gydo-XtTd1nhUNQ",
    //   "aud": "18c456bd-db75-43fe-9724-9e5d821c68ff",
    //   "exp": 1562945513,
    //   "iat": 1562858813,
    //   "nbf": 1562858813,
    //   "name": "Matt Chilkat",
    //   "preferred_username": "matt@example.com",
    //   "oid": "00000000-0000-0000-3a33-fceb9b74cc15",
    //   "tid": "9188040d-6c67-4c5b-b112-36a304b66dad",
    //   "aio": "DfibJqKnWC1c0FS6G ... W6pvTrQuYzyq16ghY$"
    // }
    // 

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    // Get each of the claims..
    String ver = jsonClaims.stringOf("ver");
    String iss = jsonClaims.stringOf("iss");
    String s_sub = jsonClaims.stringOf("sub");
    String aud = jsonClaims.stringOf("aud");
    int exp = jsonClaims.IntOf("exp");
    int iat = jsonClaims.IntOf("iat");
    int nbf = jsonClaims.IntOf("nbf");
    String name = jsonClaims.stringOf("name");
    String preferred_username = jsonClaims.stringOf("preferred_username");
    String oid = jsonClaims.stringOf("oid");
    String tid = jsonClaims.stringOf("tid");
    String aio = jsonClaims.stringOf("aio");

  }

  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."
  }
}