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/*
 * ====================================================================
 * 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
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package org.apache.http.protocol;

import java.io.IOException;

import org.apache.http.ConnectionReuseStrategy;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseFactory;
import org.apache.http.HttpServerConnection;
import org.apache.http.HttpStatus;
import org.apache.http.HttpVersion;
import org.apache.http.MethodNotSupportedException;
import org.apache.http.ProtocolException;
import org.apache.http.UnsupportedHttpVersionException;
import org.apache.http.annotation.Immutable;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.DefaultConnectionReuseStrategy;
import org.apache.http.impl.DefaultHttpResponseFactory;
import org.apache.http.params.HttpParams;
import org.apache.http.util.Args;
import org.apache.http.util.EncodingUtils;
import org.apache.http.util.EntityUtils;

/**
 * {@code HttpService} is a server side HTTP protocol handler based on
 * the classic (blocking) I/O model.
 * 

* {@code HttpService} relies on {@link HttpProcessor} to generate mandatory * protocol headers for all outgoing messages and apply common, cross-cutting * message transformations to all incoming and outgoing messages, whereas * individual {@link HttpRequestHandler}s are expected to implement * application specific content generation and processing. *

* {@code HttpService} uses {@link HttpRequestHandlerMapper} to map * matching request handler for a particular request URI of an incoming HTTP * request. *

* {@code HttpService} can use optional {@link HttpExpectationVerifier} * to ensure that incoming requests meet server's expectations. * * @since 4.0 */ @SuppressWarnings("deprecation") @Immutable // provided injected dependencies are immutable and deprecated methods are not used public class HttpService { /** * TODO: make all variables final in the next major version */ private volatile HttpParams params = null; private volatile HttpProcessor processor = null; private volatile HttpRequestHandlerMapper handlerMapper = null; private volatile ConnectionReuseStrategy connStrategy = null; private volatile HttpResponseFactory responseFactory = null; private volatile HttpExpectationVerifier expectationVerifier = null; /** * Create a new HTTP service. * * @param processor the processor to use on requests and responses * @param connStrategy the connection reuse strategy * @param responseFactory the response factory * @param handlerResolver the handler resolver. May be null. * @param expectationVerifier the expectation verifier. May be null. * @param params the HTTP parameters * * @since 4.1 * @deprecated (4.3) use {@link HttpService#HttpService(HttpProcessor, ConnectionReuseStrategy, * HttpResponseFactory, HttpRequestHandlerMapper, HttpExpectationVerifier)} */ @Deprecated public HttpService( final HttpProcessor processor, final ConnectionReuseStrategy connStrategy, final HttpResponseFactory responseFactory, final HttpRequestHandlerResolver handlerResolver, final HttpExpectationVerifier expectationVerifier, final HttpParams params) { this(processor, connStrategy, responseFactory, new HttpRequestHandlerResolverAdapter(handlerResolver), expectationVerifier); this.params = params; } /** * Create a new HTTP service. * * @param processor the processor to use on requests and responses * @param connStrategy the connection reuse strategy * @param responseFactory the response factory * @param handlerResolver the handler resolver. May be null. * @param params the HTTP parameters * * @since 4.1 * @deprecated (4.3) use {@link HttpService#HttpService(HttpProcessor, ConnectionReuseStrategy, * HttpResponseFactory, HttpRequestHandlerMapper)} */ @Deprecated public HttpService( final HttpProcessor processor, final ConnectionReuseStrategy connStrategy, final HttpResponseFactory responseFactory, final HttpRequestHandlerResolver handlerResolver, final HttpParams params) { this(processor, connStrategy, responseFactory, new HttpRequestHandlerResolverAdapter(handlerResolver), null); this.params = params; } /** * Create a new HTTP service. * * @param proc the processor to use on requests and responses * @param connStrategy the connection reuse strategy * @param responseFactory the response factory * * @deprecated (4.1) use {@link HttpService#HttpService(HttpProcessor, * ConnectionReuseStrategy, HttpResponseFactory, HttpRequestHandlerResolver, HttpParams)} */ @Deprecated public HttpService( final HttpProcessor proc, final ConnectionReuseStrategy connStrategy, final HttpResponseFactory responseFactory) { super(); setHttpProcessor(proc); setConnReuseStrategy(connStrategy); setResponseFactory(responseFactory); } /** * Create a new HTTP service. * * @param processor the processor to use on requests and responses * @param connStrategy the connection reuse strategy. If {@code null} * {@link DefaultConnectionReuseStrategy#INSTANCE} will be used. * @param responseFactory the response factory. If {@code null} * {@link DefaultHttpResponseFactory#INSTANCE} will be used. * @param handlerMapper the handler mapper. May be null. * @param expectationVerifier the expectation verifier. May be null. * * @since 4.3 */ public HttpService( final HttpProcessor processor, final ConnectionReuseStrategy connStrategy, final HttpResponseFactory responseFactory, final HttpRequestHandlerMapper handlerMapper, final HttpExpectationVerifier expectationVerifier) { super(); this.processor = Args.notNull(processor, "HTTP processor"); this.connStrategy = connStrategy != null ? connStrategy : DefaultConnectionReuseStrategy.INSTANCE; this.responseFactory = responseFactory != null ? responseFactory : DefaultHttpResponseFactory.INSTANCE; this.handlerMapper = handlerMapper; this.expectationVerifier = expectationVerifier; } /** * Create a new HTTP service. * * @param processor the processor to use on requests and responses * @param connStrategy the connection reuse strategy. If {@code null} * {@link DefaultConnectionReuseStrategy#INSTANCE} will be used. * @param responseFactory the response factory. If {@code null} * {@link DefaultHttpResponseFactory#INSTANCE} will be used. * @param handlerMapper the handler mapper. May be null. * * @since 4.3 */ public HttpService( final HttpProcessor processor, final ConnectionReuseStrategy connStrategy, final HttpResponseFactory responseFactory, final HttpRequestHandlerMapper handlerMapper) { this(processor, connStrategy, responseFactory, handlerMapper, null); } /** * Create a new HTTP service. * * @param processor the processor to use on requests and responses * @param handlerMapper the handler mapper. May be null. * * @since 4.3 */ public HttpService( final HttpProcessor processor, final HttpRequestHandlerMapper handlerMapper) { this(processor, null, null, handlerMapper, null); } /** * @deprecated (4.1) set {@link HttpProcessor} using constructor */ @Deprecated public void setHttpProcessor(final HttpProcessor processor) { Args.notNull(processor, "HTTP processor"); this.processor = processor; } /** * @deprecated (4.1) set {@link ConnectionReuseStrategy} using constructor */ @Deprecated public void setConnReuseStrategy(final ConnectionReuseStrategy connStrategy) { Args.notNull(connStrategy, "Connection reuse strategy"); this.connStrategy = connStrategy; } /** * @deprecated (4.1) set {@link HttpResponseFactory} using constructor */ @Deprecated public void setResponseFactory(final HttpResponseFactory responseFactory) { Args.notNull(responseFactory, "Response factory"); this.responseFactory = responseFactory; } /** * @deprecated (4.1) set {@link HttpResponseFactory} using constructor */ @Deprecated public void setParams(final HttpParams params) { this.params = params; } /** * @deprecated (4.1) set {@link HttpRequestHandlerResolver} using constructor */ @Deprecated public void setHandlerResolver(final HttpRequestHandlerResolver handlerResolver) { this.handlerMapper = new HttpRequestHandlerResolverAdapter(handlerResolver); } /** * @deprecated (4.1) set {@link HttpExpectationVerifier} using constructor */ @Deprecated public void setExpectationVerifier(final HttpExpectationVerifier expectationVerifier) { this.expectationVerifier = expectationVerifier; } /** * @deprecated (4.3) no longer used. */ @Deprecated public HttpParams getParams() { return this.params; } /** * Handles receives one HTTP request over the given connection within the * given execution context and sends a response back to the client. * * @param conn the active connection to the client * @param context the actual execution context. * @throws IOException in case of an I/O error. * @throws HttpException in case of HTTP protocol violation or a processing * problem. */ public void handleRequest( final HttpServerConnection conn, final HttpContext context) throws IOException, HttpException { context.setAttribute(HttpCoreContext.HTTP_CONNECTION, conn); HttpRequest request = null; HttpResponse response = null; try { request = conn.receiveRequestHeader(); if (request instanceof HttpEntityEnclosingRequest) { if (((HttpEntityEnclosingRequest) request).expectContinue()) { response = this.responseFactory.newHttpResponse(HttpVersion.HTTP_1_1, HttpStatus.SC_CONTINUE, context); if (this.expectationVerifier != null) { try { this.expectationVerifier.verify(request, response, context); } catch (final HttpException ex) { response = this.responseFactory.newHttpResponse(HttpVersion.HTTP_1_0, HttpStatus.SC_INTERNAL_SERVER_ERROR, context); handleException(ex, response); } } if (response.getStatusLine().getStatusCode() < 200) { // Send 1xx response indicating the server expections // have been met conn.sendResponseHeader(response); conn.flush(); response = null; conn.receiveRequestEntity((HttpEntityEnclosingRequest) request); } } else { conn.receiveRequestEntity((HttpEntityEnclosingRequest) request); } } context.setAttribute(HttpCoreContext.HTTP_REQUEST, request); if (response == null) { response = this.responseFactory.newHttpResponse(HttpVersion.HTTP_1_1, HttpStatus.SC_OK, context); this.processor.process(request, context); doService(request, response, context); } // Make sure the request content is fully consumed if (request instanceof HttpEntityEnclosingRequest) { final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity(); EntityUtils.consume(entity); } } catch (final HttpException ex) { response = this.responseFactory.newHttpResponse (HttpVersion.HTTP_1_0, HttpStatus.SC_INTERNAL_SERVER_ERROR, context); handleException(ex, response); } context.setAttribute(HttpCoreContext.HTTP_RESPONSE, response); this.processor.process(response, context); conn.sendResponseHeader(response); if (canResponseHaveBody(request, response)) { conn.sendResponseEntity(response); } conn.flush(); if (!this.connStrategy.keepAlive(response, context)) { conn.close(); } } private boolean canResponseHaveBody(final HttpRequest request, final HttpResponse response) { if (request != null && "HEAD".equalsIgnoreCase(request.getRequestLine().getMethod())) { return false; } final int status = response.getStatusLine().getStatusCode(); return status >= HttpStatus.SC_OK && status != HttpStatus.SC_NO_CONTENT && status != HttpStatus.SC_NOT_MODIFIED && status != HttpStatus.SC_RESET_CONTENT; } /** * Handles the given exception and generates an HTTP response to be sent * back to the client to inform about the exceptional condition encountered * in the course of the request processing. * * @param ex the exception. * @param response the HTTP response. */ protected void handleException(final HttpException ex, final HttpResponse response) { if (ex instanceof MethodNotSupportedException) { response.setStatusCode(HttpStatus.SC_NOT_IMPLEMENTED); } else if (ex instanceof UnsupportedHttpVersionException) { response.setStatusCode(HttpStatus.SC_HTTP_VERSION_NOT_SUPPORTED); } else if (ex instanceof ProtocolException) { response.setStatusCode(HttpStatus.SC_BAD_REQUEST); } else { response.setStatusCode(HttpStatus.SC_INTERNAL_SERVER_ERROR); } String message = ex.getMessage(); if (message == null) { message = ex.toString(); } final byte[] msg = EncodingUtils.getAsciiBytes(message); final ByteArrayEntity entity = new ByteArrayEntity(msg); entity.setContentType("text/plain; charset=US-ASCII"); response.setEntity(entity); } /** * The default implementation of this method attempts to resolve an * {@link HttpRequestHandler} for the request URI of the given request * and, if found, executes its * {@link HttpRequestHandler#handle(HttpRequest, HttpResponse, HttpContext)} * method. *

* Super-classes can override this method in order to provide a custom * implementation of the request processing logic. * * @param request the HTTP request. * @param response the HTTP response. * @param context the execution context. * @throws IOException in case of an I/O error. * @throws HttpException in case of HTTP protocol violation or a processing * problem. */ protected void doService( final HttpRequest request, final HttpResponse response, final HttpContext context) throws HttpException, IOException { HttpRequestHandler handler = null; if (this.handlerMapper != null) { handler = this.handlerMapper.lookup(request); } if (handler != null) { handler.handle(request, response, context); } else { response.setStatusCode(HttpStatus.SC_NOT_IMPLEMENTED); } } /** * Adaptor class to transition from HttpRequestHandlerResolver to HttpRequestHandlerMapper. */ @Deprecated private static class HttpRequestHandlerResolverAdapter implements HttpRequestHandlerMapper { private final HttpRequestHandlerResolver resolver; public HttpRequestHandlerResolverAdapter(final HttpRequestHandlerResolver resolver) { this.resolver = resolver; } @Override public HttpRequestHandler lookup(final HttpRequest request) { return resolver.lookup(request.getRequestLine().getUri()); } } }





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