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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.aliyun.mns.common.auth;

import com.aliyun.mns.common.utils.BinaryUtil;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

/**
 * Hmac-SHA1签名。
 */
public class HmacSHA1Signature extends ServiceSignature {
    private static final String DEFAULT_ENCODING = "UTF-8"; // Default encoding
    private static final String ALGORITHM = "HmacSHA1"; // Signature method.
    private static final String VERSION = "1"; // Signature version.
    private static final Object LOCK = new Object();
    private static Mac macInstance; // Prototype of the Mac instance.

    public HmacSHA1Signature() {
    }

    public String getAlgorithm() {
        return ALGORITHM;
    }

    public String getVersion() {
        return VERSION;
    }

    public String computeSignature(String key, String data) {
        try {
            byte[] signData = sign(
                key.getBytes(DEFAULT_ENCODING),
                data.getBytes(DEFAULT_ENCODING));

            return BinaryUtil.toBase64String(signData);
        } catch (UnsupportedEncodingException ex) {
            throw new RuntimeException("Unsupported algorithm: " + DEFAULT_ENCODING);
        }
    }

    private byte[] sign(byte[] key, byte[] data) {
        try {
            // Because Mac.getInstance(String) calls a synchronized method,
            // it could block on invoked concurrently.
            // SO use prototype pattern to improve perf.
            if (macInstance == null) {
                synchronized (LOCK) {
                    if (macInstance == null) {
                        macInstance = Mac.getInstance(ALGORITHM);
                    }
                }
            }

            Mac mac;
            try {
                mac = (Mac) macInstance.clone();
            } catch (CloneNotSupportedException e) {
                // If it is not clonable, create a new one.
                mac = Mac.getInstance(ALGORITHM);
            }
            mac.init(new SecretKeySpec(key, ALGORITHM));
            return mac.doFinal(data);
        } catch (NoSuchAlgorithmException ex) {
            throw new RuntimeException("Unsupported algorithm: " + ALGORITHM);
        } catch (InvalidKeyException ex) {
            throw new RuntimeException();
        }
    }
}