AccessTokenRequest.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.binding.nest.internal.messages;

import org.apache.commons.httpclient.util.URIUtil;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.openhab.binding.nest.internal.NestException;

/**
 *
 * @see AccessTokenResponse
 * @author John Cocula
 * @since 1.7.0
 */
public class AccessTokenRequest extends AbstractRequest {

    private static final String RESOURCE_URL = "https://api.home.nest.com/oauth2/access_token";

    private String clientId;
    private String clientSecret;
    private String pinCode;

    /**
     * Construct a request to obtain an access code to the Nest API.
     * 
     * @param client_id
     *            the <b>Client ID</b> shown in you Nest Clients screen and you pasted into openhab.cfg at
     *            nest:client_id
     * @param client_secret
     *            the <b>Client Secret</b> shown in you Nest Clients screen and you pasted into openhab.cfg at
     *            nest:client_secret
     * @param pincode
     *            the PIN that Nest showed on-screen and you pasted into openhab.cfg at nest:pincode
     * 
     * @see <a href="https://developer.nest.com/clients">Clients screen</a>
     */
    public AccessTokenRequest(final String clientId, final String clientSecret, final String pinCode) {
        this.clientId = clientId;
        this.clientSecret = clientSecret;
        this.pinCode = pinCode;
    }

    @Override
    public AccessTokenResponse execute() {
        final String url = buildQueryString();
        String json = null;

        try {
            json = executeQuery(url);

            final AccessTokenResponse response = JSON.readValue(json, AccessTokenResponse.class);

            return response;
        } catch (final Exception e) {
            throw newException("Could not get access token.", e, url, json);
        }
    }

    @Override
    public String toString() {
        final ToStringBuilder builder = createToStringBuilder();
        builder.appendSuper(super.toString());
        builder.append("pinCode", this.pinCode);
        builder.append("clientId", this.clientId);
        builder.append("clientSecret", this.clientSecret);
        return builder.toString();
    }

    protected String executeQuery(final String url) {
        return executeUrl(HTTP_POST, url, null, null);
    }

    private String buildQueryString() {
        final StringBuilder urlBuilder = new StringBuilder(RESOURCE_URL);

        try {
            urlBuilder.append("?code=");
            urlBuilder.append(this.pinCode);
            urlBuilder.append("&client_id=");
            urlBuilder.append(this.clientId);
            urlBuilder.append("&client_secret=");
            urlBuilder.append(this.clientSecret);
            urlBuilder.append("&grant_type=authorization_code");
            return URIUtil.encodeQuery(urlBuilder.toString());
        } catch (final Exception e) {
            throw new NestException(e);
        }
    }
}