(Java) GeoOp Exchange Refresh Token for New Access Token

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

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

    // This example also assumes that OAuth2 access and refresh tokens were previously fetched.
    // and saved in a JSON file.  

    // First get our previously obtained refresh token.
    // { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
    CkJsonObject jsonToken = new CkJsonObject();
    boolean success = jsonToken.LoadFile("qa_data/tokens/geoop.json");

    CkRest rest = new CkRest();

    // Connect to GeoOp...
    boolean bAutoReconnect = true;
    success = rest.Connect("login.geoop.com",443,true,bAutoReconnect);
    if (success != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    // Set the X-Version header.
    rest.AddHeader("X-Version","1.0");

    // Provide the required form params to get the new access token
    System.out.println("refresh_token = " + jsonToken.stringOf("refresh_token"));
    rest.AddQueryParam("refresh_token",jsonToken.stringOf("refresh_token"));
    rest.AddQueryParam("grant_type","refresh_token");
    rest.AddQueryParam("client_id","GEOOP-CLIENT-ID");
    rest.AddQueryParam("client_secret","GEOOP-CLIENT-SECRET");

    String responseBody = rest.fullRequestFormUrlEncoded("POST","/oauth2/token");
    if (rest.get_LastMethodSuccess() != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    // If the response status code did not indicate success, then see what happened..
    if (rest.get_ResponseStatusCode() != 200) {
        System.out.println("Request Header: ");
        System.out.println(rest.lastRequestHeader());
        System.out.println("----");
        System.out.println("Response StatusCode = " + rest.get_ResponseStatusCode());
        System.out.println("Response StatusLine: " + rest.responseStatusText());
        System.out.println("Response Header:");
        System.out.println(rest.responseHeader());
        System.out.println(responseBody);
        return;
        }

    CkJsonObject json = new CkJsonObject();
    json.put_EmitCompact(false);
    json.Load(responseBody);

    // Show the full JSON response.  It should contain the new access token...
    System.out.println(json.emit());
  }
}