001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.component.gae.auth;
018    
019    import java.security.KeyFactory;
020    import java.security.PrivateKey;
021    import java.security.spec.PKCS8EncodedKeySpec;
022    
023    import com.google.gdata.util.common.util.Base64;
024    
025    import org.apache.commons.io.IOUtils;
026    import org.springframework.core.io.Resource;
027    
028    /**
029     * A Java PKCS#8-specific key loader.
030     */
031    public class GAuthPk8Loader implements GAuthKeyLoader {
032    
033        private static final String BEGIN = "-----BEGIN PRIVATE KEY-----";
034        private static final String END   = "-----END PRIVATE KEY-----";
035    
036        private Resource keyLocation;
037    
038        /**
039         * Sets the location of the PKCS#8 file that contains a private key.
040         * 
041         * @param keyLocation
042         */
043        public void setKeyLocation(Resource keyLocation) {
044            this.keyLocation = keyLocation;
045        }
046    
047        /**
048         * Loads a private key from a PKCS#8 file.
049         */
050        public PrivateKey loadPrivateKey() throws Exception {
051            String str = IOUtils.toString(keyLocation.getInputStream());
052    
053            if (str.contains(BEGIN) && str.contains(END)) {
054                str = str.substring(BEGIN.length(), str.lastIndexOf(END));
055            }
056    
057            KeyFactory factory = KeyFactory.getInstance("RSA");
058            return factory.generatePrivate(new PKCS8EncodedKeySpec(Base64.decode(str)));
059        }
060        
061    }