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package com.qcloud.cos.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.codec.digest.DigestUtils;

public class Md5Utils {
    public static byte[] computeMD5Hash(InputStream is) throws IOException {
        return DigestUtils.md5(is);
    }
    
    /**
     * Returns the MD5 in base64 for the data from the given input stream.
     * Note this method closes the given input stream upon completion.
     */
    public static String md5AsBase64(InputStream is) throws IOException {
        return Base64.encodeAsString(computeMD5Hash(is));
    }
    
    /**
     * Computes the MD5 hash of the given data and returns it as an array of
     * bytes.
     */
    public static byte[] computeMD5Hash(byte[] input) {
        return DigestUtils.md5(input);
    }
    
    /**
     * Returns the MD5 in base64 for the given byte array.
     */
    public static String md5AsBase64(byte[] input) {
        return Base64.encodeAsString(computeMD5Hash(input));
    }

    /**
     * Computes the MD5 of the given file.
     */
    public static byte[] computeMD5Hash(File file) throws FileNotFoundException, IOException {
        return computeMD5Hash(new FileInputStream(file));
    }

    /**
     * Returns the MD5 in base64 for the given file.
     */
    public static String md5AsBase64(File file) throws FileNotFoundException, IOException {
        return Base64.encodeAsString(computeMD5Hash(file));
    }

}