com.threewks.thundr.user.oauth.google.GoogleOAuthProviderHttpService.java Source code

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Here is the source code for com.threewks.thundr.user.oauth.google.GoogleOAuthProviderHttpService.java

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/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://www.3wks.com.au/thundr
 * Copyright (C) 2015 3wks, <thundr@3wks.com.au>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.threewks.thundr.user.oauth.google;

import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.scribe.builder.api.DefaultApi20;
import org.scribe.model.OAuthConfig;
import org.scribe.model.OAuthConstants;
import org.scribe.model.OAuthRequest;
import org.scribe.model.Token;
import org.scribe.model.Verifier;
import org.scribe.oauth.OAuth20ServiceImpl;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

/**
 * We extend the default Oauth20ServiceImpl to handle the subtle difference for request of google OAuth access tokens.
 */
public class GoogleOAuthProviderHttpService extends OAuth20ServiceImpl {

    static final String REQUEST_KEY_GRANT_TYPE = "grant_type";
    static final String REQUEST_VALUE_AUTHORIZATION_CODE = "authorization_code";
    static final String RESPONSE_ACCESS_TOKEN_KEY = "access_token";
    private final DefaultApi20 goolgleApi;
    private final OAuthConfig config;

    private Gson gson = new GsonBuilder().create();

    /**
     * Default constructor
     * 
     * @param api OAuth2.0 goolgleApi information
     * @param config OAuth 2.0 configuration param object
     */
    public GoogleOAuthProviderHttpService(DefaultApi20 api, OAuthConfig config) {
        super(api, config);
        this.goolgleApi = api;
        this.config = config;
    }

    /**
     * 
     * @param requestToken
     * @param verifier
     */
    @SuppressWarnings("unchecked")
    @Override
    public Token getAccessToken(Token requestToken, Verifier verifier) {
        OAuthRequest request = new OAuthRequest(goolgleApi.getAccessTokenVerb(),
                goolgleApi.getAccessTokenEndpoint());
        request.addBodyParameter(OAuthConstants.CODE, verifier.getValue());
        request.addBodyParameter(OAuthConstants.CLIENT_ID, config.getApiKey());
        request.addBodyParameter(OAuthConstants.CLIENT_SECRET, config.getApiSecret());
        request.addBodyParameter(OAuthConstants.REDIRECT_URI, config.getCallback());
        request.addBodyParameter(REQUEST_KEY_GRANT_TYPE, REQUEST_VALUE_AUTHORIZATION_CODE);
        String response = sendRequest(request);
        Map<String, String> values = gson.fromJson(response, Map.class);
        String accessToken = values.get(RESPONSE_ACCESS_TOKEN_KEY);
        return new Token(accessToken, StringUtils.EMPTY, response);
    }

    String sendRequest(OAuthRequest request) {
        return request.send().getBody();
    }

}