/*
* Copyright (c) 2007-2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.sun.org.apache.xml.internal.security.keys.storage.implementations;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.cert.Certificate;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.NoSuchElementException;
import com.sun.org.apache.xml.internal.security.keys.storage.StorageResolverException;
import com.sun.org.apache.xml.internal.security.keys.storage.StorageResolverSpi;
/**
* Makes the Certificates from a JAVA {@link KeyStore} object available to the
* {@link com.sun.org.apache.xml.internal.security.keys.storage.StorageResolver}.
*/
public class KeyStoreResolver extends StorageResolverSpi {
/** Field keyStore */
private KeyStore keyStore = null;
/**
* Constructor KeyStoreResolver
*
* @param keyStore is the keystore which contains the Certificates
* @throws StorageResolverException
*/
public KeyStoreResolver(KeyStore keyStore) throws StorageResolverException {
this.keyStore = keyStore;
// Do a quick check on the keystore
try {
keyStore.aliases();
} catch (KeyStoreException ex) {
throw new StorageResolverException("generic.EmptyMessage", ex);
}
}
/** @inheritDoc */
public Iterator<Certificate> getIterator() {
return new KeyStoreIterator(this.keyStore);
}
/**
* Class KeyStoreIterator
*/
static class KeyStoreIterator implements Iterator<Certificate> {
/** Field keyStore */
KeyStore keyStore = null;
/** Field aliases */
Enumeration<String> aliases = null;
/** Field nextCert */
Certificate nextCert = null;
/**
* Constructor KeyStoreIterator
*
* @param keyStore
*/
public KeyStoreIterator(KeyStore keyStore) {
try {
this.keyStore = keyStore;
this.aliases = this.keyStore.aliases();
} catch (KeyStoreException ex) {
// empty Enumeration
this.aliases = new Enumeration<String>() {
public boolean hasMoreElements() {
return false;
}
public String nextElement() {
return null;
}
};
}
}
/** @inheritDoc */
public boolean hasNext() {
if (nextCert == null) {
nextCert = findNextCert();
}
return (nextCert != null);
}
/** @inheritDoc */
public Certificate next() {
if (nextCert == null) {
// maybe caller did not call hasNext()
nextCert = findNextCert();
if (nextCert == null) {
throw new NoSuchElementException();
}
}
Certificate ret = nextCert;
nextCert = null;
return ret;
}
/**
* Method remove
*/
public void remove() {
throw new UnsupportedOperationException("Can't remove keys from KeyStore");
}
// Find the next entry that contains a certificate and return it.
// In particular, this skips over entries containing symmetric keys.
private Certificate findNextCert() {
while (this.aliases.hasMoreElements()) {
String alias = this.aliases.nextElement();
try {
Certificate cert = this.keyStore.getCertificate(alias);
if (cert != null) {
return cert;
}
} catch (KeyStoreException ex) {
return null;
}
}
return null;
}
}
}