RandomHandler.java
/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.hc.client5.testing.classic;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.MethodNotSupportedException;
import org.apache.hc.core5.http.ProtocolException;
import org.apache.hc.core5.http.io.HttpRequestHandler;
import org.apache.hc.core5.http.io.entity.AbstractHttpEntity;
import org.apache.hc.core5.http.protocol.HttpContext;
/**
* A handler that generates random data.
*/
public class RandomHandler implements HttpRequestHandler {
/**
* Handles a request by generating random data.
* The length of the response can be specified in the request URI
* as a number after the last /. For example /random/whatever/20
* will generate 20 random bytes in the printable ASCII range.
* If the request URI ends with /, a random number of random bytes
* is generated, but at least one.
*
* @param request the request
* @param response the response
* @param context the context
*
* @throws HttpException in case of a problem
* @throws IOException in case of an IO problem
*/
@Override
public void handle(final ClassicHttpRequest request,
final ClassicHttpResponse response,
final HttpContext context)
throws HttpException, IOException {
final String method = request.getMethod();
if (!"GET".equalsIgnoreCase(method) &&
!"HEAD".equalsIgnoreCase(method) &&
!"POST".equalsIgnoreCase(method) &&
!"PUT".equalsIgnoreCase(method)) {
throw new MethodNotSupportedException(method + " not supported by " + getClass().getName());
}
final URI uri;
try {
uri = request.getUri();
} catch (final URISyntaxException ex) {
throw new ProtocolException(ex.getMessage(), ex);
}
final String path = uri.getPath();
final int slash = path.lastIndexOf('/');
if (slash != -1) {
final String payload = path.substring(slash + 1);
final long n;
if (!payload.isEmpty()) {
try {
n = Long.parseLong(payload);
} catch (final NumberFormatException ex) {
throw new ProtocolException("Invalid request path: " + path);
}
} else {
// random length, but make sure at least something is sent
n = 1 + (int)(Math.random() * 79.0);
}
response.setCode(HttpStatus.SC_OK);
response.setEntity(new RandomEntity(n));
} else {
throw new ProtocolException("Invalid request path: " + path);
}
}
/**
* An entity that generates random data.
* This is an outgoing entity, it supports {@link #writeTo writeTo}
* but not {@link #getContent getContent}.
*/
public static class RandomEntity extends AbstractHttpEntity {
/** The range from which to generate random data. */
private final static byte[] RANGE = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
.getBytes(StandardCharsets.US_ASCII);
/** The length of the random data to generate. */
protected final long length;
/**
* Creates a new entity generating the given amount of data.
*
* @param len the number of random bytes to generate,
* 0 to maxint
*/
public RandomEntity(final long len) {
super((ContentType) null, null);
length = len;
}
/**
* Tells that this entity is not streaming.
*
* @return false
*/
@Override
public final boolean isStreaming() {
return false;
}
/**
* Tells that this entity is repeatable, in a way.
* Repetitions will generate different random data,
* unless perchance the same random data is generated twice.
*
* @return {@code true}
*/
@Override
public boolean isRepeatable() {
return true;
}
/**
* Obtains the size of the random data.
*
* @return the number of random bytes to generate
*/
@Override
public long getContentLength() {
return length;
}
/**
* Not supported.
* This method throws an exception.
*
* @return never anything
*/
@Override
public InputStream getContent() {
throw new UnsupportedOperationException();
}
/**
* Generates the random content.
*
* @param out where to write the content to
*/
@Override
public void writeTo(final OutputStream out) throws IOException {
final int blocksize = 2048;
int remaining = (int) length; // range checked in constructor
final byte[] data = new byte[Math.min(remaining, blocksize)];
while (remaining > 0) {
final int end = Math.min(remaining, data.length);
double value = 0.0;
for (int i = 0; i < end; i++) {
// we get 5 random characters out of one random value
if (i % 5 == 0) {
value = Math.random();
}
value = value * RANGE.length;
final int d = (int) value;
value = value - d;
data[i] = RANGE[d];
}
out.write(data, 0, end);
out.flush();
remaining = remaining - end;
}
out.close();
}
@Override
public void close() throws IOException {
}
}
}