/*
* 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.synapse.securevault;
import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.securevault.commons.MiscellaneousUtil;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
/**
* Helper to handle encoding and decoding of data streams.
*/
public final class EncodingHelper {
private static Log log = LogFactory.getLog(EncodingHelper.class);
private EncodingHelper() {
}
/**
* Encodes the provided ByteArrayOutputStream using the specified encoding type.
*
* @param baos The ByteArrayOutputStream to encode
* @param encodingType The encoding to use
* @return The encoded ByteArrayOutputStream as a String
*/
public static byte[] encode(ByteArrayOutputStream baos, EncodingType encodingType) {
switch (encodingType) {
case BASE64:
if (log.isDebugEnabled()) {
log.debug("base64 encoding on output ");
}
return new BASE64Encoder().encode(baos.toByteArray()).getBytes();
case BIGINTEGER16:
if (log.isDebugEnabled()) {
log.debug("BigInteger 16 encoding on output ");
}
return new BigInteger(baos.toByteArray()).toByteArray();
default:
throw new IllegalArgumentException("Unsupported encoding type");
}
}
/**
* Decodes the provided InputStream using the specified encoding type.
*
* @param inputStream The InputStream to decode
* @param encodingType The encoding to use
* @return The decoded InputStream
* @throws java.io.IOException If an error occurs decoding the input stream
* @throws IllegalArgumentException if the specified encodingType is not supported
*/
public static InputStream decode(InputStream inputStream, EncodingType encodingType)
throws IOException {
InputStream decodedInputStream = null;
switch (encodingType) {
case BASE64:
if (log.isDebugEnabled()) {
log.debug("base64 decoding on input ");
}
decodedInputStream = new ByteArrayInputStream(
new BASE64Decoder().decodeBuffer(inputStream));
break;
case BIGINTEGER16:
if (log.isDebugEnabled()) {
log.debug("BigInteger 16 encoding on output ");
}
BigInteger n = new BigInteger(IOUtils.toString(inputStream), 16);
decodedInputStream = new ByteArrayInputStream(n.toByteArray());
break;
default:
throw new IllegalArgumentException("Unsupported encoding type");
}
return decodedInputStream;
}
}