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package org.glassfish.jersey.message;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
import javax.inject.Inject;
import org.glassfish.jersey.Config;
import org.glassfish.jersey.spi.ContentEncoder;
/**
* Deflate encoding support. Interceptor that encodes the output or decodes the input if
* {@link javax.ws.rs.core.HttpHeaders#CONTENT_ENCODING Content-Encoding header} value equals to {@code deflate}.
* The default behavior of this interceptor can be tweaked using {@link MessageProperties#DEFLATE_WITHOUT_ZLIB}
* property.
*
* @author Martin Matula (martin.matula at oracle.com)
*/
public class DeflateEncoder extends ContentEncoder {
private final Config config;
/**
* Initialize DeflateEncoder.
*
* @param config Jersey configuration properties.
*/
@Inject
public DeflateEncoder(Config config) {
super("deflate");
this.config = config;
}
@Override
public InputStream decode(String contentEncoding, InputStream encodedStream)
throws IOException {
// correct impl. should wrap deflate in zlib, but some don't do it - have to identify, which one we got
InputStream markSupportingStream = encodedStream.markSupported() ? encodedStream :
new BufferedInputStream(encodedStream);
markSupportingStream.mark(1);
// read the first byte
int firstByte = markSupportingStream.read();
markSupportingStream.reset();
// if using zlib, first 3 bits should be 0, 4th should be 1
// that should never be the case if no zlib wrapper
if ((firstByte & 15) == 8) {
// ok, zlib wrapped stream
return new InflaterInputStream(markSupportingStream);
} else {
// no zlib wrapper
return new InflaterInputStream(markSupportingStream, new Inflater(true));
}
}
@Override
public OutputStream encode(String contentEncoding, OutputStream entityStream)
throws IOException {
// some implementations don't support the correct deflate
// so we have a property to configure the incorrect deflate (no zlib wrapper) should be used
// let's check that
Object value = config.getProperty(MessageProperties.DEFLATE_WITHOUT_ZLIB);
boolean deflateWithoutZLib;
if (value instanceof String) {
deflateWithoutZLib = Boolean.valueOf((String) value);
} else if (value instanceof Boolean) {
deflateWithoutZLib = (Boolean) value;
} else {
deflateWithoutZLib = false;
}
return deflateWithoutZLib ?
new DeflaterOutputStream(entityStream, new Deflater(Deflater.DEFAULT_COMPRESSION, true)) :
new DeflaterOutputStream(entityStream);
}
}