| /* |
| * 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.codec.binary.Base64; |
| 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 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 Base64.encodeBase64(baos.toByteArray()); |
| 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( |
| Base64.decodeBase64(MiscellaneousUtil.asBytes(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; |
| } |
| } |