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A Fluent API wrapper around Apache HTTP Client that handles both synchronous and asynchronous REST calls.

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/*
 * Copyright (C) 2015 CapTech Ventures, Inc.
 * (http://www.captechconsulting.com) All Rights Reserved.
 *
 * 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.monarchapis.common.util;

import java.util.HashMap;
import java.util.Map;

import com.monarchapis.common.exception.ClientException;

/**
 * Utility class used to translate simple MHac algorithm names to the Java
 * algorithm names.
 * 
 * @author Phil Kedy
 */
public final class HmacUtils {
	/**
	 * The algorithm lookup map
	 */
	private static Map algorithmLookup = new HashMap();

	static {
		algorithmLookup.put("md5", "HmacMD5");
		algorithmLookup.put("sha1", "HmacSHA1");
		algorithmLookup.put("sha256", "HmacSHA256");
	}

	private HmacUtils() {
	}

	/**
	 * Performs the algorithm name lookup.
	 * 
	 * @param algorithm
	 *            The simple algorithm name
	 * @return the Java algorithm name.
	 */
	public static String getHMacAlgorithm(String algorithm) {
		String digestAlgorithm = algorithmLookup.get(algorithm);

		if (digestAlgorithm == null) {
			throw new ClientException("Invalid algorithm " + algorithm);
		}

		return digestAlgorithm;
	}
}