| /* |
| * 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.asyncweb.common.codec; |
| |
| import java.net.URI; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.asyncweb.common.DefaultHttpRequest; |
| import org.apache.asyncweb.common.HttpHeaderConstants; |
| import org.apache.asyncweb.common.HttpMethod; |
| import org.apache.asyncweb.common.HttpRequest; |
| import org.apache.asyncweb.common.HttpResponseStatus; |
| import org.apache.asyncweb.common.HttpVersion; |
| import org.apache.asyncweb.common.MutableHttpRequest; |
| import org.apache.mina.core.buffer.IoBuffer; |
| import org.apache.mina.filter.codec.ProtocolDecoderException; |
| import org.apache.mina.filter.codec.ProtocolDecoderOutput; |
| import org.apache.mina.filter.codec.statemachine.CrLfDecodingState; |
| import org.apache.mina.filter.codec.statemachine.DecodingState; |
| import org.apache.mina.filter.codec.statemachine.DecodingStateMachine; |
| import org.apache.mina.filter.codec.statemachine.FixedLengthDecodingState; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Parses HTTP requests. |
| * Clients should register a <code>HttpRequestParserListener</code> |
| * in order to receive notifications at important stages of request |
| * building.<br/> |
| * |
| * <code>HttpRequestParser</code>s should not be built for each request |
| * as each parser constructs an underlying state machine which is |
| * relatively costly to build.<br/> Instead, parsers should be pooled.<br/> |
| * |
| * Note, however, that a parser <i>must</i> be <code>prepare</code>d before |
| * each new parse. |
| * |
| * @author The Apache MINA Project (dev@mina.apache.org) |
| * @version $Rev$, $Date$ |
| */ |
| abstract class HttpRequestDecodingStateMachine extends DecodingStateMachine { |
| |
| private static final Logger LOG = LoggerFactory |
| .getLogger(HttpRequestDecodingStateMachine.class); |
| |
| /** |
| * The request we are building |
| */ |
| private MutableHttpRequest request; |
| |
| @Override |
| protected DecodingState init() throws Exception { |
| request = new DefaultHttpRequest(); |
| return SKIP_EMPTY_LINES; |
| } |
| |
| @Override |
| protected void destroy() throws Exception { |
| request = null; |
| } |
| |
| private final DecodingState SKIP_EMPTY_LINES = new CrLfDecodingState() { |
| |
| @Override |
| protected DecodingState finishDecode(boolean foundCRLF, |
| ProtocolDecoderOutput out) throws Exception { |
| if (foundCRLF) { |
| return this; |
| } else { |
| return READ_REQUEST_LINE; |
| } |
| } |
| }; |
| |
| private final DecodingState READ_REQUEST_LINE = new HttpRequestLineDecodingState() { |
| @Override |
| protected DecodingState finishDecode(List<Object> childProducts, |
| ProtocolDecoderOutput out) throws Exception { |
| URI requestUri = (URI) childProducts.get(1); |
| request.setMethod((HttpMethod) childProducts.get(0)); |
| request.setRequestUri(requestUri); |
| request.setProtocolVersion((HttpVersion) childProducts.get(2)); |
| request.setParameters(requestUri.getRawQuery()); |
| return READ_HEADERS; |
| } |
| }; |
| |
| private final DecodingState READ_HEADERS = new HttpHeaderDecodingState() { |
| @Override |
| @SuppressWarnings("unchecked") |
| protected DecodingState finishDecode(List<Object> childProducts, |
| ProtocolDecoderOutput out) throws Exception { |
| Map<String, List<String>> headers = |
| (Map<String, List<String>>) childProducts.get(0); |
| |
| // Set cookies. |
| List<String> cookies = headers.get( |
| HttpHeaderConstants.KEY_COOKIE); |
| if (cookies != null && !cookies.isEmpty()) { |
| if (cookies.size() > 1) { |
| if (LOG.isWarnEnabled()) { |
| LOG.warn("Ignoring extra cookie headers: " |
| + cookies.subList(1, cookies.size())); |
| } |
| } |
| request.setCookies(cookies.get(0)); |
| } |
| |
| // Set headers. |
| request.setHeaders(headers); |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Decoded header: " + request.getHeaders()); |
| } |
| |
| // Select appropriate body decoding state. |
| boolean isChunked = false; |
| if (request.getProtocolVersion() == HttpVersion.HTTP_1_1) { |
| LOG.debug("Request is HTTP 1/1. Checking for transfer coding"); |
| isChunked = isChunked(request); |
| } else { |
| LOG.debug("Request is not HTTP 1/1. Using content length"); |
| } |
| DecodingState nextState; |
| if (isChunked) { |
| LOG.debug("Using chunked decoder for request"); |
| nextState = new ChunkedBodyDecodingState() { |
| @Override |
| protected DecodingState finishDecode( |
| List<Object> childProducts, |
| ProtocolDecoderOutput out) throws Exception { |
| if (childProducts.size() != 1) { |
| int chunkSize = 0; |
| for (Object product : childProducts) { |
| IoBuffer chunk = (IoBuffer) product; |
| chunkSize += chunk.remaining(); |
| } |
| |
| IoBuffer body = IoBuffer.allocate(chunkSize); |
| for (Object product : childProducts) { |
| IoBuffer chunk = (IoBuffer) product; |
| body.put(chunk); |
| } |
| body.flip(); |
| request.setContent(body); |
| } else { |
| request.setContent((IoBuffer) childProducts.get(0)); |
| } |
| |
| out.write(request); |
| return null; |
| } |
| }; |
| } else { |
| int length = getContentLength(request); |
| if (length > 0) { |
| if (LOG.isDebugEnabled()) { |
| LOG |
| .debug("Using fixed length decoder for request with length " |
| + length); |
| } |
| nextState = new FixedLengthDecodingState(length) { |
| @Override |
| protected DecodingState finishDecode(IoBuffer readData, |
| ProtocolDecoderOutput out) throws Exception { |
| request.setContent(readData); |
| out.write(request); |
| return null; |
| } |
| }; |
| } else { |
| LOG.debug("No entity body for this request"); |
| out.write(request); |
| nextState = null; |
| } |
| } |
| return nextState; |
| } |
| |
| /** |
| * Obtains the content length from the specified request |
| * |
| * @param request The request |
| * @return The content length, or 0 if not specified |
| * @throws HttpDecoderException If an invalid content length is specified |
| */ |
| private int getContentLength(HttpRequest request) |
| throws ProtocolDecoderException { |
| int length = 0; |
| String lengthValue = request.getHeader( |
| HttpHeaderConstants.KEY_CONTENT_LENGTH); |
| if (lengthValue != null) { |
| try { |
| length = Integer.parseInt(lengthValue); |
| } catch (NumberFormatException e) { |
| HttpCodecUtils.throwDecoderException( |
| "Invalid content length: " + length, |
| HttpResponseStatus.BAD_REQUEST); |
| } |
| } |
| return length; |
| } |
| |
| /** |
| * Determines whether a specified request employs a chunked |
| * transfer coding |
| * |
| * @param request The request |
| * @return <code>true</code> iff the request employs a |
| * chunked transfer coding |
| * @throws HttpDecoderException |
| * If the request employs an unsupported coding |
| */ |
| private boolean isChunked(HttpRequest request) |
| throws ProtocolDecoderException { |
| boolean isChunked = false; |
| String coding = request.getHeader( |
| HttpHeaderConstants.KEY_TRANSFER_ENCODING); |
| if (coding == null) { |
| coding = request.getHeader( |
| HttpHeaderConstants.KEY_TRANSFER_CODING); |
| } |
| |
| if (coding != null) { |
| int extensionIndex = coding.indexOf(';'); |
| if (extensionIndex != -1) { |
| coding = coding.substring(0, extensionIndex); |
| } |
| if (HttpHeaderConstants.VALUE_CHUNKED.equalsIgnoreCase(coding)) { |
| isChunked = true; |
| } else { |
| // As we only support chunked encoding, any other encoding |
| // is unsupported |
| HttpCodecUtils.throwDecoderException( |
| "Unknown transfer coding " + coding, |
| HttpResponseStatus.NOT_IMPLEMENTED); |
| } |
| } |
| return isChunked; |
| } |
| }; |
| } |