/*
 * 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.handler.codec.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.util.CharsetUtil;

import static io.netty.handler.codec.http.HttpConstants.SP;

Encodes an HttpRequest or an HttpContent into a ByteBuf.
/** * Encodes an {@link HttpRequest} or an {@link HttpContent} into * a {@link ByteBuf}. */
public class HttpRequestEncoder extends HttpObjectEncoder<HttpRequest> { private static final char SLASH = '/'; private static final char QUESTION_MARK = '?'; private static final int SLASH_AND_SPACE_SHORT = (SLASH << 8) | SP; private static final int SPACE_SLASH_AND_SPACE_MEDIUM = (SP << 16) | SLASH_AND_SPACE_SHORT; @Override public boolean acceptOutboundMessage(Object msg) throws Exception { return super.acceptOutboundMessage(msg) && !(msg instanceof HttpResponse); } @Override protected void encodeInitialLine(ByteBuf buf, HttpRequest request) throws Exception { ByteBufUtil.copy(request.method().asciiName(), buf); String uri = request.uri(); if (uri.isEmpty()) { // Add " / " as absolute path if uri is not present. // See http://tools.ietf.org/html/rfc2616#section-5.1.2 ByteBufUtil.writeMediumBE(buf, SPACE_SLASH_AND_SPACE_MEDIUM); } else { CharSequence uriCharSequence = uri; boolean needSlash = false; int start = uri.indexOf("://"); if (start != -1 && uri.charAt(0) != SLASH) { start += 3; // Correctly handle query params. // See https://github.com/netty/netty/issues/2732 int index = uri.indexOf(QUESTION_MARK, start); if (index == -1) { if (uri.lastIndexOf(SLASH) < start) { needSlash = true; } } else { if (uri.lastIndexOf(SLASH, index) < start) { uriCharSequence = new StringBuilder(uri).insert(index, SLASH); } } } buf.writeByte(SP).writeCharSequence(uriCharSequence, CharsetUtil.UTF_8); if (needSlash) { // write "/ " after uri ByteBufUtil.writeShortBE(buf, SLASH_AND_SPACE_SHORT); } else { buf.writeByte(SP); } } request.protocolVersion().encode(buf); ByteBufUtil.writeShortBE(buf, CRLF_SHORT); } }