/*
* Copyright 2016 ThoughtWorks, Inc.
*
* 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.thoughtworks.go.agent.common.ssl;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class CertificateFileParser {
public List<X509Certificate> certificates(File certFile) throws IOException, CertificateException {
ArrayList<X509Certificate> certs = new ArrayList<>();
if (certFile != null && certFile.exists() && certFile.canRead()) {
try (FileInputStream fis = new FileInputStream(certFile)) {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
Collection<? extends Certificate> certificates = cf.generateCertificates(fis);
for (Certificate cert : certificates) {
if (cert instanceof X509Certificate) {
certs.add((X509Certificate) cert);
}
}
}
}
return certs;
}
}