/**
 * 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 org.apache.xml.security.test.stax.utils;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.ParserConfigurationException;
import java.io.FileInputStream;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.spec.X509EncodedKeySpec;

import org.w3c.dom.Document;

import org.apache.xml.security.utils.JavaUtils;
import org.apache.xml.security.utils.XMLUtils;

public class KeyLoader {
    private static final String BASEDIR = System.getProperty("basedir") == null ? "./": System.getProperty("basedir");
    private static final String SEP = System.getProperty("file.separator");

    private static DocumentBuilder documentBuilder;

    static {
        try {
            documentBuilder = XMLUtils.createDocumentBuilder(false);
        } catch (ParserConfigurationException e) {
            throw new RuntimeException(e);
        }
    }

    private static String getControlFilePath(String fileName) {
        return BASEDIR + SEP + "src" + SEP + "test" + SEP + "resources" +
                SEP + "org" + SEP + "apache" + SEP + "xml" + SEP + "security" +
                SEP + "keys" + SEP + "content" +
                SEP + fileName;
    }

    public static PublicKey loadPublicKey(String filePath, String algorithm) throws Exception {
        String fileData = new String(JavaUtils.getBytesFromFile(getControlFilePath(filePath)));
        byte[] keyBytes = XMLUtils.decode(fileData);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        return kf.generatePublic(keySpec);
    }

    public static Document loadXML(String fileName) throws Exception {
        return documentBuilder.parse(new FileInputStream(getControlFilePath(fileName)));
    }

}