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org.apache.xmlrpc.webserver.Connection Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.xmlrpc.webserver;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.Socket;
import java.net.SocketException;
import java.util.Iterator;
import java.util.Map;
import java.util.StringTokenizer;
import org.apache.xmlrpc.common.ServerStreamConnection;
import org.apache.xmlrpc.common.XmlRpcHttpRequestConfig;
import org.apache.xmlrpc.common.XmlRpcNotAuthorizedException;
import org.apache.xmlrpc.server.XmlRpcHttpServerConfig;
import org.apache.xmlrpc.server.XmlRpcStreamServer;
import org.apache.xmlrpc.util.HttpUtil;
import org.apache.xmlrpc.util.LimitedInputStream;
import org.apache.xmlrpc.util.ThreadPool;
/** Handler for a single clients connection. This implementation
* is able to do HTTP keepalive. In other words, it can serve
* multiple requests via a single, physical connection.
*/
public class Connection implements ThreadPool.InterruptableTask, ServerStreamConnection {
private static final String US_ASCII = "US-ASCII";
private static final byte[] ctype = toHTTPBytes("Content-Type: text/xml\r\n");
private static final byte[] clength = toHTTPBytes("Content-Length: ");
private static final byte[] newline = toHTTPBytes("\r\n");
private static final byte[] doubleNewline = toHTTPBytes("\r\n\r\n");
private static final byte[] conkeep = toHTTPBytes("Connection: Keep-Alive\r\n");
private static final byte[] conclose = toHTTPBytes("Connection: close\r\n");
private static final byte[] ok = toHTTPBytes(" 200 OK\r\n");
private static final byte[] serverName = toHTTPBytes("Server: Apache XML-RPC 1.0\r\n");
private static final byte[] wwwAuthenticate = toHTTPBytes("WWW-Authenticate: Basic realm=XML-RPC\r\n");
private static abstract class RequestException extends IOException {
private static final long serialVersionUID = 2113732921468653309L;
private final RequestData requestData;
RequestException(RequestData pData, String pMessage) {
super(pMessage);
requestData = pData;
}
RequestData getRequestData() { return requestData; }
}
private static class BadEncodingException extends RequestException {
private static final long serialVersionUID = -2674424938251521248L;
BadEncodingException(RequestData pData, String pTransferEncoding) {
super(pData, pTransferEncoding);
}
}
private static class BadRequestException extends RequestException {
private static final long serialVersionUID = 3257848779234554934L;
BadRequestException(RequestData pData, String pTransferEncoding) {
super(pData, pTransferEncoding);
}
}
/** Returns the US-ASCII encoded byte representation of text for
* HTTP use (as per section 2.2 of RFC 2068).
*/
private static final byte[] toHTTPBytes(String text) {
try {
return text.getBytes(US_ASCII);
} catch (UnsupportedEncodingException e) {
throw new Error(e.getMessage() +
": HTTP requires US-ASCII encoding");
}
}
private final WebServer webServer;
private final Socket socket;
private final InputStream input;
private final OutputStream output;
private final XmlRpcStreamServer server;
private byte[] buffer;
private Map headers;
private RequestData requestData;
private boolean shuttingDown;
private boolean firstByte;
/** Creates a new webserver connection on the given socket.
* @param pWebServer The webserver maintaining this connection.
* @param pServer The server being used to execute requests.
* @param pSocket The server socket to handle; the Connection
* is responsible for closing this socket.
* @throws IOException if an I/O error occurs
*/
public Connection(WebServer pWebServer, XmlRpcStreamServer pServer, Socket pSocket)
throws IOException {
webServer = pWebServer;
server = pServer;
socket = pSocket;
input = new BufferedInputStream(socket.getInputStream()){
/** It may happen, that the XML parser invokes close().
* Closing the input stream must not occur, because
* that would close the whole socket. So we suppress it.
*/
public void close() throws IOException {
}
};
output = new BufferedOutputStream(socket.getOutputStream());
}
/** Returns the connections request configuration by
* merging the HTTP request headers and the servers configuration.
* @return The connections request configuration.
* @throws IOException Reading the request headers failed.
*/
private RequestData getRequestConfig() throws IOException {
requestData = new RequestData(this);
if (headers != null) {
headers.clear();
}
firstByte = true;
XmlRpcHttpServerConfig serverConfig = (XmlRpcHttpServerConfig) server.getConfig();
requestData.setBasicEncoding(serverConfig.getBasicEncoding());
requestData.setContentLengthOptional(serverConfig.isContentLengthOptional());
requestData.setEnabledForExtensions(serverConfig.isEnabledForExtensions());
requestData.setEnabledForExceptions(serverConfig.isEnabledForExceptions());
// reset user authentication
String line = readLine();
if (line == null && firstByte) {
return null;
}
// Netscape sends an extra \n\r after bodypart, swallow it
if (line != null && line.length() == 0) {
line = readLine();
if (line == null || line.length() == 0) {
return null;
}
}
// tokenize first line of HTTP request
StringTokenizer tokens = new StringTokenizer(line);
String method = tokens.nextToken();
if (!"POST".equalsIgnoreCase(method)) {
throw new BadRequestException(requestData, method);
}
requestData.setMethod(method);
tokens.nextToken(); // Skip URI
String httpVersion = tokens.nextToken();
requestData.setHttpVersion(httpVersion);
requestData.setKeepAlive(serverConfig.isKeepAliveEnabled()
&& WebServer.HTTP_11.equals(httpVersion));
do {
line = readLine();
if (line != null) {
String lineLower = line.toLowerCase();
if (lineLower.startsWith("content-length:")) {
String cLength = line.substring("content-length:".length());
requestData.setContentLength(Integer.parseInt(cLength.trim()));
} else if (lineLower.startsWith("connection:")) {
requestData.setKeepAlive(serverConfig.isKeepAliveEnabled()
&& lineLower.indexOf("keep-alive") > -1);
} else if (lineLower.startsWith("authorization:")) {
String credentials = line.substring("authorization:".length());
HttpUtil.parseAuthorization(requestData, credentials);
} else if (lineLower.startsWith("transfer-encoding:")) {
String transferEncoding = line.substring("transfer-encoding:".length());
String nonIdentityEncoding = HttpUtil.getNonIdentityTransferEncoding(transferEncoding);
if (nonIdentityEncoding != null) {
throw new BadEncodingException(requestData, nonIdentityEncoding);
}
}
}
}
while (line != null && line.length() != 0);
return requestData;
}
public void run() {
try {
for (int i = 0; ; i++) {
RequestData data = getRequestConfig();
if (data == null) {
break;
}
server.execute(data, this);
output.flush();
if (!data.isKeepAlive() || !data.isSuccess()) {
break;
}
}
} catch (RequestException e) {
webServer.log(e.getClass().getName() + ": " + e.getMessage());
try {
writeErrorHeader(e.requestData, e, -1);
output.flush();
} catch (IOException e1) {
/* Ignore me */
}
} catch (Throwable t) {
if (!shuttingDown) {
webServer.log(t);
}
} finally {
try { output.close(); } catch (Throwable ignore) {}
try { input.close(); } catch (Throwable ignore) {}
try { socket.close(); } catch (Throwable ignore) {}
}
}
private String readLine() throws IOException {
if (buffer == null) {
buffer = new byte[2048];
}
int next;
int count = 0;
for (;;) {
try {
next = input.read();
firstByte = false;
} catch (SocketException e) {
if (firstByte) {
return null;
} else {
throw e;
}
}
if (next < 0 || next == '\n') {
break;
}
if (next != '\r') {
buffer[count++] = (byte) next;
}
if (count >= buffer.length) {
throw new IOException("HTTP Header too long");
}
}
return new String(buffer, 0, count, US_ASCII);
}
/** Writes the response header and the response to the
* output stream.
* @param pData The request data.
* @param pBuffer The {@link ByteArrayOutputStream} holding the response.
* @throws IOException Writing the response failed.
*/
public void writeResponse(RequestData pData, OutputStream pBuffer)
throws IOException {
ByteArrayOutputStream response = (ByteArrayOutputStream) pBuffer;
writeResponseHeader(pData, response.size());
response.writeTo(output);
}
/** Writes the response header to the output stream. *
* @param pData The request data
* @param pContentLength The content length, if known, or -1.
* @throws IOException Writing the response failed.
*/
public void writeResponseHeader(RequestData pData, int pContentLength)
throws IOException {
output.write(toHTTPBytes(pData.getHttpVersion()));
output.write(ok);
output.write(serverName);
output.write(pData.isKeepAlive() ? conkeep : conclose);
output.write(ctype);
if (headers != null) {
for (Iterator iter = headers.entrySet().iterator(); iter.hasNext(); ) {
Map.Entry entry = (Map.Entry) iter.next();
String header = (String) entry.getKey();
String value = (String) entry.getValue();
output.write(toHTTPBytes(header + ": " + value + "\r\n"));
}
}
if (pContentLength != -1) {
output.write(clength);
output.write(toHTTPBytes(Integer.toString(pContentLength)));
output.write(doubleNewline);
} else {
output.write(newline);
}
pData.setSuccess(true);
}
/** Writes an error response to the output stream.
* @param pData The request data.
* @param pError The error being reported.
* @param pStream The {@link ByteArrayOutputStream} with the error response.
* @throws IOException Writing the response failed.
*/
public void writeError(RequestData pData, Throwable pError, ByteArrayOutputStream pStream)
throws IOException {
writeErrorHeader(pData, pError, pStream.size());
pStream.writeTo(output);
output.flush();
}
/** Writes an error responses headers to the output stream.
* @param pData The request data.
* @param pError The error being reported.
* @param pContentLength The response length, if known, or -1.
* @throws IOException Writing the response failed.
*/
public void writeErrorHeader(RequestData pData, Throwable pError, int pContentLength)
throws IOException {
if (pError instanceof BadRequestException) {
final byte[] content = toHTTPBytes("Method " + pData.getMethod()
+ " not implemented (try POST)\r\n");
output.write(toHTTPBytes(pData.getHttpVersion()));
output.write(toHTTPBytes(" 400 Bad Request"));
output.write(newline);
output.write(serverName);
writeContentLengthHeader(content.length);
output.write(newline);
output.write(content);
} else if (pError instanceof BadEncodingException) {
final byte[] content = toHTTPBytes("The Transfer-Encoding " + pError.getMessage()
+ " is not implemented.\r\n");
output.write(toHTTPBytes(pData.getHttpVersion()));
output.write(toHTTPBytes(" 501 Not Implemented"));
output.write(newline);
output.write(serverName);
writeContentLengthHeader(content.length);
output.write(newline);
output.write(content);
} else if (pError instanceof XmlRpcNotAuthorizedException) {
final byte[] content = toHTTPBytes("Method " + pData.getMethod()
+ " requires a " + "valid user name and password.\r\n");
output.write(toHTTPBytes(pData.getHttpVersion()));
output.write(toHTTPBytes(" 401 Unauthorized"));
output.write(newline);
output.write(serverName);
writeContentLengthHeader(content.length);
output.write(wwwAuthenticate);
output.write(newline);
output.write(content);
} else {
output.write(toHTTPBytes(pData.getHttpVersion()));
output.write(ok);
output.write(serverName);
output.write(conclose);
output.write(ctype);
writeContentLengthHeader(pContentLength);
output.write(newline);
}
}
private void writeContentLengthHeader(int pContentLength) throws IOException {
if (pContentLength == -1) {
return;
}
output.write(clength);
output.write(toHTTPBytes(Integer.toString(pContentLength)));
output.write(newline);
}
/** Sets a response header value.
* @param pHeader the header name
* @param pValue the header value
*/
public void setResponseHeader(String pHeader, String pValue) {
headers.put(pHeader, pValue);
}
public OutputStream newOutputStream() throws IOException {
boolean useContentLength;
useContentLength = !requestData.isEnabledForExtensions()
|| !((XmlRpcHttpRequestConfig) requestData).isContentLengthOptional();
if (useContentLength) {
return new ByteArrayOutputStream();
} else {
return output;
}
}
public InputStream newInputStream() throws IOException {
int contentLength = requestData.getContentLength();
if (contentLength == -1) {
return input;
} else {
return new LimitedInputStream(input, contentLength);
}
}
public void close() throws IOException {
}
public void shutdown() throws Throwable {
shuttingDown = true;
socket.close();
}
}
