/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.runtime.core.transformer.codec;
import org.mule.runtime.api.metadata.DataType;
import org.mule.runtime.api.streaming.bytes.CursorStreamProvider;
import org.mule.runtime.core.api.transformer.TransformerException;
import org.mule.runtime.core.config.i18n.CoreMessages;
import org.mule.runtime.core.transformer.AbstractTransformer;
import org.mule.runtime.core.util.Base64;
import org.mule.runtime.core.util.IOUtils;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
/**
* <code>Base64Encoder</code> transforms Base64 encoded data into strings or byte arrays.
*/
public class Base64Decoder extends AbstractTransformer {
public Base64Decoder() {
registerSourceType(DataType.STRING);
registerSourceType(DataType.BYTE_ARRAY);
registerSourceType(DataType.INPUT_STREAM);
registerSourceType(DataType.CURSOR_STREAM_PROVIDER);
setReturnDataType(DataType.BYTE_ARRAY);
}
@Override
public Object doTransform(Object src, Charset outputEncoding) throws TransformerException {
try {
String data;
if (src instanceof byte[]) {
data = new String((byte[]) src, outputEncoding);
} else if (src instanceof CursorStreamProvider) {
data = handleStream(((CursorStreamProvider) src).openCursor(), outputEncoding);
} else if (src instanceof InputStream) {
data = handleStream((InputStream) src, outputEncoding);
} else {
data = (String) src;
}
byte[] result = Base64.decode(data);
if (DataType.STRING.isCompatibleWith(getReturnDataType())) {
return new String(result, outputEncoding);
} else {
return result;
}
} catch (Exception ex) {
throw new TransformerException(CoreMessages.transformFailed("base64", getReturnDataType()), this, ex);
}
}
private String handleStream(InputStream input, Charset outputEncoding) throws IOException {
String data;
try {
data = IOUtils.toString(input, outputEncoding);
} finally {
input.close();
}
return data;
}
}