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

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    /*
 * nimbus-jose-jwt
 *
 * Copyright 2012-2016, Connect2id Ltd.
 *
 * 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 com.nimbusds.jose.util;


import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.text.ParseException;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;

import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.openssl.PEMParser;


/**
 * X.509 certificate chain utilities.
 *
 * @author Vladimir Dzhuvinov
 * @version 2020-02-22
 */
public class X509CertChainUtils {

	
	/**
	 * Converts the specified JSON array of strings to a list of Base64
	 * encoded objects.
	 *
	 * @param jsonArray The JSON array of string, {@code null} if not
	 *                  specified.
	 *
	 * @return The Base64 list, {@code null} if not specified.
	 *
	 * @throws ParseException If parsing failed.
	 */
	public static List toBase64List(final List jsonArray)
		throws ParseException {
		
		if (jsonArray == null)
			return null;

		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;
	}
	
	
	/**
	 * Parses a X.509 certificate chain from the specified Base64-encoded
	 * DER-encoded representation.
	 *
	 * @param b64List The Base64-encoded DER-encoded X.509 certificate
	 *                chain, {@code null} if not specified.
	 *
	 * @return The X.509 certificate chain, {@code null} if not specified.
	 *
	 * @throws ParseException If parsing failed.
	 */
	public static List parse(final List b64List)
		throws ParseException {
		
		if (b64List == null)
			return null;
		
		List out = new LinkedList<>();
		
		for (int i=0; i < b64List.size(); i++) {
			
			if (b64List.get(i)== null) continue; // skip
			
			X509Certificate cert = X509CertUtils.parse(b64List.get(i).decode());
			
			if (cert == null) {
				throw new ParseException("Invalid X.509 certificate at position " + i, 0);
			}
			
			out.add(cert);
		}
		
		return out;
	}
	
	
	/**
	 * Parses a X.509 certificate chain from the specified PEM-encoded
	 * representation. PEM-encoded objects that are not X.509 certificates
	 * are ignored. Requires BouncyCastle.
	 *
	 * @param pemFile The PEM-encoded X.509 certificate chain file. Must
	 *                not be {@code null}.
	 *
	 * @return The X.509 certificate chain, empty list if no certificates
	 *         are found.
	 *
	 * @throws IOException          On I/O exception.
	 * @throws CertificateException On a certificate exception.
	 */
	public static List parse(final File pemFile)
		throws IOException, CertificateException {
		
		final String pemString = new String(Files.readAllBytes(pemFile.toPath()), StandardCharset.UTF_8);
		return parse(pemString);
	}
	
	
	/**
	 * Parses a X.509 certificate chain from the specified PEM-encoded
	 * representation. PEM-encoded objects that are not X.509 certificates
	 * are ignored. Requires BouncyCastle.
	 *
	 * @param pemString The PEM-encoded X.509 certificate chain. Must not
	 *                  be {@code null}.
	 *
	 * @return The X.509 certificate chain, empty list if no certificates
	 *         are found.
	 *
	 * @throws IOException          On I/O exception.
	 * @throws CertificateException On a certificate exception.
	 */
	public static List parse(final String pemString)
		throws IOException, CertificateException {
		
		final Reader pemReader = new StringReader(pemString);
		final PEMParser parser = new PEMParser(pemReader);
		
		List certChain = new LinkedList<>();
		
		Object pemObject;
		do {
			pemObject = parser.readObject();
			
			if (pemObject instanceof X509CertificateHolder) {
				
				X509CertificateHolder certHolder = (X509CertificateHolder)pemObject;
				byte[] derEncodedCert = certHolder.getEncoded();
				certChain.add(X509CertUtils.parseWithException(derEncodedCert));
				
			}
			
		} while (pemObject != null);
		
		return certChain;
	}
	
	
	/**
	 * Stores a X.509 certificate chain into the specified Java trust (key)
	 * store. The name (alias) for each certificate in the store is a
	 * generated UUID.
	 *
	 * @param trustStore The trust (key) store. Must be initialised and not
	 *                   {@code null}.
	 * @param certChain  The X.509 certificate chain. Must not be
	 *                   {@code null}.
	 *
	 * @return The UUIDs for the stored entry.
	 *
	 * @throws KeyStoreException On a key store exception.
	 */
	public static List store(final KeyStore trustStore, final List certChain)
		throws KeyStoreException {
		
		List aliases = new LinkedList<>();
		
		for (X509Certificate cert: certChain) {
			UUID alias = UUID.randomUUID();
			trustStore.setCertificateEntry(alias.toString(), cert);
			aliases.add(alias);
		}
		
		return aliases;
	}

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

    




    
    
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