org.jasig.cas.util.PublicKeyFactoryBean.java Source code

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Here is the source code for org.jasig.cas.util.PublicKeyFactoryBean.java

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/*
 * Licensed to Apereo under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Apereo 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 the following location:
 *
 *   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 org.jasig.cas.util;

import java.io.InputStream;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.spec.X509EncodedKeySpec;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.AbstractFactoryBean;
import org.springframework.core.io.Resource;

import javax.validation.constraints.NotNull;

/**
 * FactoryBean for creating a public key from a file.
 *
 * @author Scott Battaglia
 * @author Misagh Moayyed
 * @since 3.1
 */
public class PublicKeyFactoryBean extends AbstractFactoryBean<PublicKey> {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @NotNull
    private Resource resource;

    @NotNull
    private String algorithm;

    @Override
    protected final PublicKey createInstance() throws Exception {
        logger.debug("Creating public key instance from [{}] using [{}]", this.resource.getFilename(),
                this.algorithm);

        try (final InputStream pubKey = this.resource.getInputStream()) {
            final byte[] bytes = new byte[pubKey.available()];
            pubKey.read(bytes);
            final X509EncodedKeySpec pubSpec = new X509EncodedKeySpec(bytes);
            final KeyFactory factory = KeyFactory.getInstance(this.algorithm);
            return factory.generatePublic(pubSpec);
        }
    }

    public Class getObjectType() {
        return PublicKey.class;
    }

    public Resource getResource() {
        return resource;
    }

    public String getAlgorithm() {
        return algorithm;
    }

    public void setLocation(final Resource resource) {
        this.resource = resource;
    }

    public void setAlgorithm(final String algorithm) {
        this.algorithm = algorithm;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this).appendSuper(super.toString()).append("resource", this.resource)
                .append("algorithm", this.algorithm).toString();
    }
}