/*
 * Copyright (C) 2018, Salesforce.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.eclipse.jgit.lib;

import static java.nio.charset.StandardCharsets.US_ASCII;

import java.io.Serializable;

import org.eclipse.jgit.annotations.NonNull;

/**
 * A structure for holding GPG signature together with additional related data.
 *
 * @since 5.3
 */
public class GpgSignature implements Serializable {

	private static final long serialVersionUID = 1L;

	private byte[] signature;

	/**
	 * Creates a new instance with the specified signature
	 *
	 * @param signature
	 *            the signature
	 */
	public GpgSignature(@NonNull byte[] signature) {
		this.signature = signature;
	}

	/**
	 * Format for Git storage.
	 * <p>
	 * This returns the ASCII Armor as per
	 * https://tools.ietf.org/html/rfc4880#section-6.2.
	 * </p>
	 *
	 * @return a string of the signature ready to be embedded in a Git object
	 */
	public String toExternalString() {
		return new String(signature, US_ASCII);
	}

	/** {@inheritDoc} */
	@Override
	@SuppressWarnings("nls")
	public String toString() {
		final StringBuilder r = new StringBuilder();

		r.append("GpgSignature[");
		r.append(
				this.signature != null ? "length " + signature.length : "null");
		r.append("]");

		return r.toString();
	}
}