org.cloudme.armada.util.TokenUtils.java Source code

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Here is the source code for org.cloudme.armada.util.TokenUtils.java

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// Copyright 2015 Moritz Petersen
//
// 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 org.cloudme.armada.util;

import java.security.SecureRandom;

import com.google.appengine.repackaged.org.apache.commons.codec.binary.Hex;
import com.google.common.hash.Hashing;

/**
 * Some utility methods to work with tokens.
 * 
 * @author Moritz Petersen
 */
public class TokenUtils {
    private static SecureRandom secureRandom = new SecureRandom();

    private TokenUtils() {
        // don't instantiate
    }

    /**
     * Generates a random code of the given number of bytes.
     * 
     * @param size
     *            Size in bytes.
     * @return A random code.
     */
    public static String randomCode(int size) {
        byte[] bytes = new byte[size];
        secureRandom.nextBytes(bytes);
        return Hex.encodeHexString(bytes);
    }

    /**
     * Creates a hash of the given value. The hashing algorithm is currently SHA-256.
     * 
     * @param value
     *            The original value.
     * @return The hashed value.
     */
    public static String hash(String value) {
        return Hashing.sha256().hashBytes(value.getBytes()).toString();
    }
}