(Java) Group: Refresh OAuth2 Access Token

Refreshes an expired or non-expired OAuth2 access token for the Microsoft Group REST API.

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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.

    CkJsonObject json = new CkJsonObject();
    boolean success = json.LoadFile("qa_data/tokens/msGraphGroup.json");
    if (success != true) {
        return;
        }

    CkHttpRequest req = new CkHttpRequest();
    req.AddParam("grant_type","refresh_token");
    req.AddParam("redirect_uri","http://localhost:3017/");
    req.AddParam("client_id","MICROSOFT-GRAPH-CLIENT-ID");
    req.AddParam("client_secret","MICROSOFT-GRAPH-CLIENT-SECRET");
    req.AddParam("refresh_token",json.stringOf("refresh_token"));
    req.AddParam("scope","openid profile offline_access user.readwrite group.readwrite.all files.readwrite");

    CkHttp http = new CkHttp();

    CkHttpResponse resp = http.PostUrlEncoded("https://login.microsoftonline.com/common/oauth2/v2.0/token",req);
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

    // Load the JSON response.
    json.Load(resp.bodyStr());
    json.put_EmitCompact(false);

    // Show the JSON response.
    System.out.println(json.emit());

    System.out.println("Response status code: " + resp.get_StatusCode());

    // If the response status code is not 200, then it's an error.
    if (resp.get_StatusCode() != 200) {
        return;
        }

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

    System.out.println("Success.");
  }
}