/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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 io.netty.example.http.snoop;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.DecoderResult;
import io.netty.handler.codec.http.Cookie;
import io.netty.handler.codec.http.CookieDecoder;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpObject;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.codec.http.QueryStringDecoder;
import io.netty.handler.codec.http.ServerCookieEncoder;
import io.netty.util.CharsetUtil;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import static io.netty.handler.codec.http.HttpHeaders.Names.*;
import static io.netty.handler.codec.http.HttpResponseStatus.*;
import static io.netty.handler.codec.http.HttpVersion.*;
public class HttpSnoopServerHandler extends SimpleChannelInboundHandler<Object> {
private HttpRequest request;
/** Buffer that stores the response content */
private final StringBuilder buf = new StringBuilder();
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.flush();
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, Object msg) {
if (msg instanceof HttpRequest) {
HttpRequest request = this.request = (HttpRequest) msg;
if (HttpHeaders.is100ContinueExpected(request)) {
send100Continue(ctx);
}
buf.setLength(0);
buf.append("WELCOME TO THE WILD WILD WEB SERVER\r\n");
buf.append("===================================\r\n");
buf.append("VERSION: ").append(request.getProtocolVersion()).append("\r\n");
buf.append("HOSTNAME: ").append(HttpHeaders.getHost(request, "unknown")).append("\r\n");
buf.append("REQUEST_URI: ").append(request.getUri()).append("\r\n\r\n");
HttpHeaders headers = request.headers();
if (!headers.isEmpty()) {
for (Map.Entry<String, String> h: headers) {
String key = h.getKey();
String value = h.getValue();
buf.append("HEADER: ").append(key).append(" = ").append(value).append("\r\n");
}
buf.append("\r\n");
}
QueryStringDecoder queryStringDecoder = new QueryStringDecoder(request.getUri());
Map<String, List<String>> params = queryStringDecoder.parameters();
if (!params.isEmpty()) {
for (Entry<String, List<String>> p: params.entrySet()) {
String key = p.getKey();
List<String> vals = p.getValue();
for (String val : vals) {
buf.append("PARAM: ").append(key).append(" = ").append(val).append("\r\n");
}
}
buf.append("\r\n");
}
appendDecoderResult(buf, request);
}
if (msg instanceof HttpContent) {
HttpContent httpContent = (HttpContent) msg;
ByteBuf content = httpContent.content();
if (content.isReadable()) {
buf.append("CONTENT: ");
buf.append(content.toString(CharsetUtil.UTF_8));
buf.append("\r\n");
appendDecoderResult(buf, request);
}
if (msg instanceof LastHttpContent) {
buf.append("END OF CONTENT\r\n");
LastHttpContent trailer = (LastHttpContent) msg;
if (!trailer.trailingHeaders().isEmpty()) {
buf.append("\r\n");
for (String name: trailer.trailingHeaders().names()) {
for (String value: trailer.trailingHeaders().getAll(name)) {
buf.append("TRAILING HEADER: ");
buf.append(name).append(" = ").append(value).append("\r\n");
}
}
buf.append("\r\n");
}
if (!writeResponse(trailer, ctx)) {
// If keep-alive is off, close the connection once the content is fully written.
ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
}
}
}
}
private static void appendDecoderResult(StringBuilder buf, HttpObject o) {
DecoderResult result = o.getDecoderResult();
if (result.isSuccess()) {
return;
}
buf.append(".. WITH DECODER FAILURE: ");
buf.append(result.cause());
buf.append("\r\n");
}
private boolean writeResponse(HttpObject currentObj, ChannelHandlerContext ctx) {
// Decide whether to close the connection or not.
boolean keepAlive = HttpHeaders.isKeepAlive(request);
// Build the response object.
FullHttpResponse response = new DefaultFullHttpResponse(
HTTP_1_1, currentObj.getDecoderResult().isSuccess()? OK : BAD_REQUEST,
Unpooled.copiedBuffer(buf.toString(), CharsetUtil.UTF_8));
response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
if (keepAlive) {
// Add 'Content-Length' header only for a keep-alive connection.
response.headers().set(CONTENT_LENGTH, response.content().readableBytes());
// Add keep alive header as per:
// - http://www.w3.org/Protocols/HTTP/1.1/draft-ietf-http-v11-spec-01.html#Connection
response.headers().set(CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
}
// Encode the cookie.
String cookieString = request.headers().get(COOKIE);
if (cookieString != null) {
Set<Cookie> cookies = CookieDecoder.decode(cookieString);
if (!cookies.isEmpty()) {
// Reset the cookies if necessary.
for (Cookie cookie: cookies) {
response.headers().add(SET_COOKIE, ServerCookieEncoder.encode(cookie));
}
}
} else {
// Browser sent no cookie. Add some.
response.headers().add(SET_COOKIE, ServerCookieEncoder.encode("key1", "value1"));
response.headers().add(SET_COOKIE, ServerCookieEncoder.encode("key2", "value2"));
}
// Write the response.
ctx.write(response);
return keepAlive;
}
private static void send100Continue(ChannelHandlerContext ctx) {
FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, CONTINUE);
ctx.write(response);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
}