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RqLengthAware.java
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RqLengthAware.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.takes.rq;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import lombok.EqualsAndHashCode;
import org.takes.Request;
/**
* Request decorator that limits its body, according to
* the Content-Length header in its head.
*
* <p>This decorator may help when you're planning to read
* the body of the request using its read() and available() methods,
* but you're not sure that available() is always saying the truth. In
* most cases, the browser will not close the request and will always
* return positive number in available() method. Thus, you won't be
* able to reach the end of the stream ever. The browser wants you
* to respect the "Content-Length" header and read as many bytes
* as it requests. To solve that, just wrap your request into this
* decorator.
*
* <p>The class is immutable and thread-safe.
*
* @since 0.15
* @see org.takes.rq.RqMultipart
* @see org.takes.rq.RqPrint
*/
@EqualsAndHashCode(callSuper = true)
public final class RqLengthAware extends RqWrap {
/**
* Ctor.
* @param req Original request
*/
public RqLengthAware(final Request req) {
super(
new Request() {
@Override
public Iterable<String> head() throws IOException {
return req.head();
}
@Override
public InputStream body() throws IOException {
return RqLengthAware.cap(req);
}
}
);
}
/**
* Cap the steam.
* @param req Request
* @return Stream with a cap
* @throws IOException If fails
*/
private static InputStream cap(final Request req) throws IOException {
final Iterator<String> hdr = new RqHeaders.Base(req)
.header("Content-Length").iterator();
InputStream body = req.body();
long length = (long) body.available();
if (hdr.hasNext()) {
length = Long.parseLong(hdr.next());
}
body = new CapInputStream(body, length);
return body;
}
}