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/*******************************************************************************
 * Copyright (C) 2022-2023 WaveMaker, Inc.
 *
 * 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.wavemaker.commons.auth.oauth2.extractors;

import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Created by srujant on 24/8/17.
 */
public class AccessTokenResponseExtractor {

    private static final Logger logger = LoggerFactory.getLogger(AccessTokenResponseExtractor.class);
    private List accessTokenExtractorsList = new ArrayList<>();

    public AccessTokenResponseExtractor() {
        accessTokenExtractorsList.add(new JsonFormatAccessTokenExtractor());
        accessTokenExtractorsList.add(new FormUrlEncodedFormatAccessTokenExtractor());
        accessTokenExtractorsList.add(new XmlFormatAccessTokenExtractor());
        accessTokenExtractorsList.add(new AccessTokenInObjectExtractor());
    }

    /**
     * Extracts access_token from {@link com.wavemaker.commons.auth.oauth2.extractors.AccessTokenRequestContext #getResonseBody()} using 
     * {@link AccessTokenExtractor}.
     */
    public String getAccessToken(AccessTokenRequestContext accessTokenRequestContext) {
        String accessToken = null;
        for (AccessTokenExtractor accessTokenExtractor : accessTokenExtractorsList) {
            logger.debug("Using {} to extract accessToken", accessTokenExtractor.getClass());
            accessToken = accessTokenExtractor.getAccessToken(accessTokenRequestContext);
            if (accessToken != null) {
                logger.debug("Found accessToken using {}", accessTokenExtractor.getClass());
                return accessToken;
            }
        }
        return accessToken;
    }
}