/******************************************************************************
* Copyright © 2013-2016 The Nxt Core Developers. *
* *
* See the AUTHORS.txt, DEVELOPER-AGREEMENT.txt and LICENSE.txt files at *
* the top-level directory of this distribution for the individual copyright *
* holder information and the developer policies on copyright and licensing. *
* *
* Unless otherwise agreed in a custom licensing agreement, no part of the *
* Nxt software, including this file, may be copied, modified, propagated, *
* or distributed except according to the terms contained in the LICENSE.txt *
* file. *
* *
* Removal or modification of this copyright notice is prohibited. *
* *
******************************************************************************/
package nxt.http;
import nxt.Nxt;
import nxt.util.Convert;
import org.json.simple.JSONObject;
import org.json.simple.JSONStreamAware;
import javax.servlet.http.HttpServletRequest;
import static nxt.http.JSONResponses.INCORRECT_HEIGHT;
import static nxt.http.JSONResponses.MISSING_HEIGHT;
public final class GetBlockId extends APIServlet.APIRequestHandler {
static final GetBlockId instance = new GetBlockId();
private GetBlockId() {
super(new APITag[] {APITag.BLOCKS}, "height");
}
@Override
JSONStreamAware processRequest(HttpServletRequest req) {
int height;
try {
String heightValue = Convert.emptyToNull(req.getParameter("height"));
if (heightValue == null) {
return MISSING_HEIGHT;
}
height = Integer.parseInt(heightValue);
} catch (RuntimeException e) {
return INCORRECT_HEIGHT;
}
try {
JSONObject response = new JSONObject();
response.put("block", Long.toUnsignedString(Nxt.getBlockchain().getBlockIdAtHeight(height)));
return response;
} catch (RuntimeException e) {
return INCORRECT_HEIGHT;
}
}
}