(Java) Hotmail Refresh Access Token (also for Live.com, Outlook.com)

See more OAuth2 Examples

An OAuth2 access token is typically valid for 1 hour. Interaction with the Hotmail account owner via a browser is only needed for getting the initial access token. Once you have it, it can be continually refreshed without user interaction for a long time.

See: How Long can an OAuth2 Access Token be Refreshed?

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

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.

    // It is assumed we previously obtained an OAuth2 access token.

    // Note: Refreshing an access token does not require user-interaction.  
    // Only the act of getting the initial access token requires interactive authorization from the Hotmail account owner 
    // (i.e. a browser is displayed and the Hotmail account owner authorizes access by the app).

    // Once you have the initial access token, it can be refreshed for a long time.
    // A typical strategy is to write your application to automatically refresh the access token 
    // when authentication fails, and then retry the operation with the new access token.

    CkJsonObject jsonToken = new CkJsonObject();
    boolean success = jsonToken.LoadFile("qa_data/tokens/hotmail.json");
    if (success != true) {
        System.out.println("Failed to load office365.json");
        return;
        }

    // The access token JSON looks like this:

    // {
    //   "token_type": "Bearer",
    //   "scope": "https://outlook.office.com/SMTP.Send https://outlook.office.com/IMAP.AccessAsUser.All https://outlook.office.com/POP.AccessAsUser.All",
    //   "expires_in": 3600,
    //   "ext_expires_in": 3600,
    //   "access_token": "EwBoA+ ... 7pOYcWr5pFwQgI=",
    //   "refresh_token": "M.C546_BL2.0.U.-CkW ... g5CKSlDBQ$$",
    //   "id_token": "eyJ0e ... 2iiu5iqBK9n7s3A"
    // }

    CkOAuth2 oauth2 = new CkOAuth2();

    // See Microsoft OAuth2 Authorization Endpoint
    oauth2.put_TokenEndpoint("https://login.microsoftonline.com/common/oauth2/v2.0/token");

    // Replace this with your actual App Registration's Application (client) ID.
    oauth2.put_ClientId("CLIENT_ID");

    // Get the "refresh_token"
    oauth2.put_RefreshToken(jsonToken.stringOf("refresh_token"));

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

    System.out.println(oauth2.lastErrorText());

    System.out.println("New access token: " + oauth2.accessToken());
    System.out.println("New refresh token: " + oauth2.refreshToken());

    // Update the JSON with the new tokens.
    jsonToken.UpdateString("access_token",oauth2.accessToken());
    jsonToken.UpdateString("refresh_token",oauth2.refreshToken());

    // Save the new JSON access token response to a file.
    CkStringBuilder sbJson = new CkStringBuilder();
    jsonToken.put_EmitCompact(false);
    jsonToken.EmitSb(sbJson);
    sbJson.WriteFile("qa_data/tokens/hotmail.json","utf-8",false);

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