Java tutorial
/* * Copyright 2015 Julien Viet * * Licensed 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.termd.core.http.netty; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.DefaultFullHttpResponse; import io.netty.handler.codec.http.DefaultHttpResponse; import io.netty.handler.codec.http.FullHttpRequest; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.HttpHeaders; import io.netty.handler.codec.http.HttpResponse; import io.netty.handler.codec.http.HttpResponseStatus; import io.netty.handler.codec.http.HttpVersion; import io.netty.handler.codec.http.LastHttpContent; import io.termd.core.http.HttpTtyConnection; import io.termd.core.util.Logging; import java.io.InputStream; import java.net.URL; /** * @author <a href="mailto:julien@julienviet.com">Julien Viet</a> */ public class HttpRequestHandler extends SimpleChannelInboundHandler<FullHttpRequest> { private final String wsUri; public HttpRequestHandler(String wsUri) { this.wsUri = wsUri; } @Override protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception { if (wsUri.equalsIgnoreCase(request.getUri())) { ctx.fireChannelRead(request.retain()); } else { if (HttpHeaders.is100ContinueExpected(request)) { send100Continue(ctx); } HttpResponse response = new DefaultHttpResponse(request.getProtocolVersion(), HttpResponseStatus.INTERNAL_SERVER_ERROR); String path = request.getUri(); if ("/".equals(path)) { path = "/index.html"; } URL res = HttpTtyConnection.class.getResource("/io/termd/core/http" + path); try { if (res != null) { DefaultFullHttpResponse fullResp = new DefaultFullHttpResponse(request.getProtocolVersion(), HttpResponseStatus.OK); InputStream in = res.openStream(); byte[] tmp = new byte[256]; for (int l = 0; l != -1; l = in.read(tmp)) { fullResp.content().writeBytes(tmp, 0, l); } int li = path.lastIndexOf('.'); if (li != -1 && li != path.length() - 1) { String ext = path.substring(li + 1, path.length()); String contentType; switch (ext) { case "html": contentType = "text/html"; break; case "js": contentType = "application/javascript"; break; default: contentType = null; break; } if (contentType != null) { fullResp.headers().set(HttpHeaders.Names.CONTENT_TYPE, contentType); } } response = fullResp; } else { response.setStatus(HttpResponseStatus.NOT_FOUND); } } catch (Exception e) { e.printStackTrace(); } finally { ctx.write(response); ChannelFuture future = ctx.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT); future.addListener(ChannelFutureListener.CLOSE); } } } private static void send100Continue(ChannelHandlerContext ctx) { FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.CONTINUE); ctx.writeAndFlush(response); } public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { Logging.logReportedIoError(cause); ctx.close(); } }