package com.xiaopeng.vehicleConvoy.util;


import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

/**
 * 该API支持线程安全<br/>
 */
public class SHA1Util {
	// --------------------------计算SHA1大写字符串----------------------------------------------
	/**
	 * 计算出文件的SHA1大写字符串
	 * 
	 * @param file
	 * @return
	 * @throws IOException
	 */
	public static String getSHA1UpperString(File file) throws IOException {
		return HexUtil.toUpperCase(getSHA1Bytes(file));
	}

	/**
	 * 计算出SHA1后十六进制结果（大写）
	 * 
	 * @param s
	 * @return
	 */
	public static String getSHA1UpperString(String s) {
		try {
			return getSHA1UpperString(s.getBytes("UTF-8"));
		} catch (UnsupportedEncodingException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * 计算出SHA1后十六进制结果（大写）
	 * 
	 * @param bytes
	 * @return
	 */
	public static String getSHA1UpperString(byte[] bytes) {
		return HexUtil.toUpperCase(getSHA1Bytes(bytes));
	}

	// --------------------------计算SHA1小写字符串----------------------------------------------
	/**
	 * 计算出文件的SHA1小写字符串
	 * 
	 * @param file
	 * @return
	 * @throws IOException
	 */
	public static String getSHA1LowerString(File file) throws IOException {
		return HexUtil.toLowerCase(getSHA1Bytes(file));
	}

	/**
	 * 计算出SHA1后十六进制结果（小写）
	 * 
	 * @param s
	 * @return
	 */
	public static String getSHA1LowerString(String s) {
		try {
			return getSHA1LowerString(s.getBytes("UTF-8"));
		} catch (UnsupportedEncodingException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * 计算出SHA1后十六进制结果（小写）
	 * 
	 * @param bytes
	 * @return
	 */
	public static String getSHA1LowerString(byte[] bytes) {
		return HexUtil.toLowerCase(getSHA1Bytes(bytes));
	}

	// ------------------------计算出SHA1的byte[]------------------------------------------------
	public static byte[] getSHA1Bytes(byte[] bytes) {
		ThreadLocalSHA1.current().update(bytes);
		return ThreadLocalSHA1.current().digest();
	}

	public static byte[] getSHA1Bytes(File file) throws IOException {
		FileInputStream in = null;
		FileChannel ch = null;
		try {
			in = new FileInputStream(file);
			ch = in.getChannel();

			MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());

			ThreadLocalSHA1.current().update(byteBuffer);
			return ThreadLocalSHA1.current().digest();
		} finally {
			ResourceUtil.closeGracefully(ch);
			ResourceUtil.closeGracefully(in);
		}
	}

	// ------------------------------------------------------------------------
	public static boolean checkPassword(String originContent, String sha1Content) {
		String s = getSHA1LowerString(originContent);
		return s.equals(sha1Content);
	}

	// ------------------------------------------------------------------------
	
}