Java

Refresh Expiring OAuth2 Access Token for Azure Registered App

See more OAuth2 Examples

Shows how to renew an Azure App's access token using the refresh token when it's near expiration. Java

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[])
  {
    boolean success = false;

    // We previously obtained an access token and saved the JSON to a file using this example:
    // Get OAuth2 Access Token for Azure Registered App

    // This example will examine the JSON and expiration date, and if near expiration will
    // refresh the access token.

    CkJsonObject json = new CkJsonObject();
    success = json.LoadFile("qa_data/tokens/_myAzureApp.json");
    if (success != true) {
        System.out.println("Failed to load the access token.");
        return;
        }

    // The contents of the JSON look like this:
    // {
    //   "token_type": "Bearer",
    //   "scope": "User.Read Mail.ReadWrite Mail.Send",
    //   "expires_in": 3600,
    //   "ext_expires_in": 0,
    //   "access_token": "EwBAA8l6B...",
    //   "refresh_token": "MCRMdbe6Cd...",
    //   "id_token": "eyJ0eXAiOiJ...",
    //   "expires_on": "1494112119"
    // }

    // The "expires_on" value is a Unix time.
    CkDateTime dtExpire = new CkDateTime();
    dtExpire.SetFromUnixTime(false,json.IntOf("expires_on"));

    // If this date/time expires within 10 minutes of the current system time, refresh the token.
    if (dtExpire.ExpiresWithin(10,"minutes") != true) {
        System.out.println("No need to refresh, the access token won't expire within the next 10 minutes.");
        return;
        }

    // OK, we need to refresh the access token..
    CkOAuth2 oauth2 = new CkOAuth2();

    // Note: The endpoint depends on the Azure App Registration.
    // See How to Choose the Correct Endpoints for your Azure App Registration
    oauth2.put_TokenEndpoint("https://login.microsoftonline.com/common/oauth2/v2.0/token");

    // Use your client ID.
    oauth2.put_ClientId("CLIENT_ID");

    // Get the existing refresh token.
    oauth2.put_RefreshToken(json.stringOf("refresh_token"));

    // Send the HTTP POST to refresh the access token.
    success = oauth2.RefreshAccessToken();
    if (success == false) {
        System.out.println(oauth2.lastErrorText());
        return;
        }

    System.out.println("OAuth2 authorization granted!");
    System.out.println("Access Token = " + oauth2.accessToken());

    // Get the full JSON response:
    json.Load(oauth2.accessTokenResponse());
    json.put_EmitCompact(false);

    // If an "expires_on" member does not exist, then add the JSON member by
    // getting the current system date/time and adding the "expires_in" seconds.
    // This way we'll know when the token expires.
    if (json.HasMember("expires_on") != true) {
        dtExpire.SetFromCurrentSystemTime();
        dtExpire.AddSeconds(json.IntOf("expires_in"));
        json.AppendString("expires_on",dtExpire.getAsUnixTimeStr(false));
        }

    System.out.println(json.emit());

    // Save the new access token JSON to a file for future requests.
    CkFileAccess fac = new CkFileAccess();
    fac.WriteEntireTextFile("qa_data/tokens/_myAzureApp.json",json.emit(),"utf-8",false);
  }
}