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Java library for Javascript Object Signing and Encryption (JOSE) and JSON Web Tokens (JWT)

There is a newer version: 9.38-rc4

package com.nimbusds.jose.util;


import java.text.ParseException;
import java.util.LinkedList;
import java.util.List;

import net.minidev.json.JSONArray;


/**
 * X.509 certificate chain utilities.
 *
 * @author Vladimir Dzhuvinov
 * @version 2013-05-29
 */
public class X509CertChainUtils {

	/**
	 * Parses an X.509 certificate chain from the specified JSON array.
	 *
	 * @param jsonArray The JSON array to parse. Must not be {@code null}.
	 *
	 * @return The X.509 certificate chain.
	 *
	 * @throws ParseException If the X.509 certificate chain couldn't be
	 *                        parsed.
	 */
	public static List parseX509CertChain(final JSONArray jsonArray)
		throws ParseException {

		List chain = new LinkedList<>();

		for (int i=0; i < jsonArray.size(); i++) {

			Object item = jsonArray.get(i);

			if (item == null) {
				throw new ParseException("The X.509 certificate at position " + i + " must not be null", 0);
			}

			if  (! (item instanceof String)) {
				throw new ParseException("The X.509 certificate at position " + i + " must be encoded as a Base64 string", 0);
			}

			chain.add(new Base64((String)item));
		}

		return chain;
	}

	/**
	 * Prevents public instantiation.
	 */
	private X509CertChainUtils() {}
}