/**
 * =============================================================================
 *
 * ORCID (R) Open Source
 * http://orcid.org
 *
 * Copyright (c) 2012-2014 ORCID, Inc.
 * Licensed under an MIT-Style License (MIT)
 * http://orcid.org/open-source-license
 *
 * This copyright and license information (including a link to the full license)
 * shall be included in its entirety in all copies or substantial portion of
 * the software.
 *
 * =============================================================================
 */
package org.orcid.frontend.web.util;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

/**
 * Adapted from
 * http://www.journaldev.com/7133/how-to-integrate-google-recaptcha-
 * in-java-web-application Not great code, but I think it will work.
 * 
 * @author tom
 *
 */
public class RecaptchaVerifier {

    private final static String USER_AGENT = "Mozilla/5.0";
    private final String url;
    private final String secret;

    public RecaptchaVerifier(String url, String secret) {
        this.url = url;
        this.secret = secret;
    }

    public boolean verify(String gRecaptchaResponse) {
        if (gRecaptchaResponse == null || "".equals(gRecaptchaResponse)) {
            return false;
        }

        try {
            URL obj = new URL(this.url);
            HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();

            // add request header
            con.setRequestMethod("POST");
            con.setRequestProperty("User-Agent", USER_AGENT);
            con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

            String postParams = "secret=" + this.secret + "&response=" + gRecaptchaResponse;

            // Send post request
            con.setDoOutput(true);
            DataOutputStream wr = new DataOutputStream(con.getOutputStream());
            wr.writeBytes(postParams);
            wr.flush();
            wr.close();

            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();
            return response.toString().contains("true");
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}