/
HttpRequestWrapper.java
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/
HttpRequestWrapper.java
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/*
* Copyright 2015 - Per Wendel
*
* Licensed 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 spark.embeddedserver.jetty;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import spark.utils.IOUtils;
/**
* Http request wrapper. Wraps the request so 'getInputStream()' can be called multiple times.
* Also has methods for checking if request has been consumed.
*/
public class HttpRequestWrapper extends HttpServletRequestWrapper {
private byte[] cachedBytes;
private boolean notConsumed = false;
public HttpRequestWrapper(HttpServletRequest request) {
super(request);
}
public boolean notConsumed() {
return notConsumed;
}
public void notConsumed(boolean notConsumed) {
this.notConsumed = notConsumed;
}
@Override
public ServletInputStream getInputStream() throws IOException {
HttpServletRequest request = (HttpServletRequest) super.getRequest();
// disable stream cache for chunked transfer encoding
String transferEncoding = request.getHeader("Transfer-Encoding");
if ("chunked".equals(transferEncoding)) {
return super.getInputStream();
}
// disable stream cache for multipart/form-data file upload
// -> upload might be very large and might lead to out-of-memory error if we try to cache the bytes
String contentType = request.getHeader("Content-Type");
if (contentType != null && contentType.startsWith("multipart/form-data")) {
return super.getInputStream();
}
if (cachedBytes == null) {
cacheInputStream();
}
return new CachedServletInputStream();
}
private void cacheInputStream() throws IOException {
cachedBytes = IOUtils.toByteArray(super.getInputStream());
}
private class CachedServletInputStream extends ServletInputStream {
private ByteArrayInputStream byteArrayInputStream;
public CachedServletInputStream() {
byteArrayInputStream = new ByteArrayInputStream(cachedBytes);
}
@Override
public int read() {
return byteArrayInputStream.read();
}
@Override
public int available() {
return byteArrayInputStream.available();
}
@Override
public boolean isFinished() {
return available() <= 0;
}
@Override
public boolean isReady() {
return available() >= 0;
}
@Override
public void setReadListener(ReadListener readListener) {
}
}
}