(Java) Refresh eBay Application Access Token

This example shows how to get a new eBay REST API access token when the original is close to expiration.

Note: This example requires Chilkat v9.5.0.80 or greater. (This example was written on 21-August-2019, before v9.5.0.80 was released. If Contact Chilkat for a pre-release if the current Chilkat version is not yet at 9.5.0.80 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.

    // The previously fetched eBay access token looks like this:

    // {
    //   "access_token": "v^1.1#i^1# ... HwSAAA=",
    //   "expires_in": 7200,
    //   "refresh_token": "v^1.1#i^1# ... FXjEyODQ=",
    //   "refresh_token_expires_in": 47304000,
    //   "token_type": "User Access Token"
    // }

    CkJsonObject json = new CkJsonObject();
    boolean success = json.LoadFile("qa_data/tokens/ebay-access-token.json");
    if (success == false) {
        System.out.println("Failed to load the existing ebay access token JSON.");
        return;
        }

    CkOAuth2 oauth2 = new CkOAuth2();

    oauth2.put_TokenEndpoint("https://api.sandbox.ebay.com/identity/v1/oauth2/token");

    // Replace these with actual values.
    oauth2.put_ClientId("EBAY_CLIENT_ID");
    oauth2.put_ClientSecret("EBAY_CLIENT_SECRET");

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

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

    // Load the access token response into the JSON object 
    json.Load(oauth2.accessTokenResponse());

    // Save the new JSON access token response to a file.
    // The access + refresh tokens contained in this JSON will be needed for the next refresh.
    json.put_EmitCompact(false);
    json.WriteFile("qa_data/tokens/ebay-access-token.json");

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