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/**
 * Copyright 2003-2016 SSHTOOLS Limited. All Rights Reserved.
 *
 * For product documentation visit https://www.sshtools.com/
 *
 * This file is part of J2SSH Maverick.
 *
 * J2SSH Maverick is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * J2SSH Maverick is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with J2SSH Maverick.  If not, see .
 */
package com.sshtools.publickey;

import java.io.IOException;

import com.sshtools.ssh.SshException;
import com.sshtools.ssh.components.SshPublicKey;

public class SECSHPublicKeyFile extends Base64EncodedFileFormat implements
		SshPublicKeyFile {

	private static String BEGIN = "---- BEGIN SSH2 PUBLIC KEY ----";
	private static String END = "---- END SSH2 PUBLIC KEY ----";
	String algorithm;
	byte[] encoded;

	SECSHPublicKeyFile(byte[] formattedkey) throws IOException {
		super(BEGIN, END);
		encoded = getKeyBlob(formattedkey);
		toPublicKey(); // Validate
	}

	SECSHPublicKeyFile(SshPublicKey key, String comment) throws IOException {
		super(BEGIN, END);
		try {
			algorithm = key.getAlgorithm();
			encoded = key.getEncoded();
			setComment(comment);
			toPublicKey(); // Validate
		} catch (SshException ex) {
			throw new IOException("Failed to encode public key");
		}
	}

	public String getComment() {
		return getHeaderValue("Comment");
	}

	public SshPublicKey toPublicKey() throws IOException {
		return SshPublicKeyFileFactory.decodeSSH2PublicKey(encoded);
	}

	public byte[] getFormattedKey() throws IOException {
		return formatKey(encoded);
	}

	public void setComment(String comment) {
		setHeaderValue("Comment", (comment.trim().startsWith("\"") ? "" : "\"")
				+ comment.trim() + (comment.trim().endsWith("\"") ? "" : "\""));
	}

	public String toString() {
		try {
			return new String(getFormattedKey());
		} catch (IOException ex) {
			return "Invalid encoding!";
		}

	}

}