sdis1819-t2g03

package utils;

import java.nio.charset.StandardCharsets;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class Utils {

        public static final char CR = (char) 0x0D;

        public static final char LF = (char) 0x0A;

        public final static String CRLF = "" + CR + LF;

        public static final int CHUNK_MAX_SIZE = 64000;

        public static final int PACKET_SIZE = 65536;                    

        public enum MessageType { PUTCHUNK, STORED, GETCHUNK, CHUNK, REMOVED, DELETE }

    public enum SocketType { MC, MDB, MDR }

        private static final String MULTICAST_ADDR = "224.0.0.1";

        private static final int DEFAULT_PORT_MC = 8000;

        private static final String MDB_ADDR = "224.0.0.2";

        private static final int DEFAULT_PORT_MDB = 8001;

        public static final String FILES = "../files/";

        public static final String CHUNKS = "chunks/";

        public static final String RESTORES = "restores/";

        public static final String VERSION = "1.0";

        public static SocketType MDB;

        private static String bytesToHex(byte[] hash) {

                StringBuffer hexString = new StringBuffer();

                for (int i = 0; i < hash.length; i++) {

                        String hex = Integer.toHexString(0xff & hash[i]);

                        if(hex.length() == 1) hexString.append('0');

                        hexString.append(hex);

                }

                return hexString.toString();

        }

        public static String hash(String originalString) throws NoSuchAlgorithmException {

                MessageDigest digest = MessageDigest.getInstance("SHA-256");

                byte[] encodedHash = digest.digest(originalString.getBytes(StandardCharsets.UTF_8));

                String hashedID = bytesToHex(encodedHash);

                System.out.println("" + encodedHash.length + " : " + hashedID);

                return hashedID;

        }

}