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1   /*
2    * Copyright 2016 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty5.handler.codec.http2;
17  
18  import io.netty5.buffer.api.Buffer;
19  import io.netty5.channel.ChannelHandler;
20  import io.netty5.channel.ChannelHandlerContext;
21  import io.netty5.handler.codec.http.FullHttpMessage;
22  import io.netty5.handler.codec.http.HttpHeaders;
23  import io.netty5.handler.codec.http.HttpScheme;
24  import io.netty5.util.internal.UnstableApi;
25  
26  /**
27   * Translates HTTP/1.x object reads into HTTP/2 frames.
28   */
29  @UnstableApi
30  public class InboundHttpToHttp2Adapter implements ChannelHandler {
31      private final Http2Connection connection;
32      private final Http2FrameListener listener;
33  
34      public InboundHttpToHttp2Adapter(Http2Connection connection, Http2FrameListener listener) {
35          this.connection = connection;
36          this.listener = listener;
37      }
38  
39      private static int getStreamId(Http2Connection connection, HttpHeaders httpHeaders) {
40          return httpHeaders.getInt(HttpConversionUtil.ExtensionHeaderNames.STREAM_ID.text(),
41                                    connection.remote().incrementAndGetNextStreamId());
42      }
43  
44      @Override
45      public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
46          if (msg instanceof FullHttpMessage) {
47              final FullHttpMessage<?> fullHttpMessage = (FullHttpMessage<?>) msg;
48              try (fullHttpMessage) {
49                  handle(ctx, connection, listener, fullHttpMessage);
50              }
51          } else {
52              ctx.fireChannelRead(msg);
53          }
54      }
55  
56      // note that this may behave strangely when used for the initial upgrade
57      // message when using h2c, since that message is ineligible for flow
58      // control, but there is not yet an API for signaling that.
59      static void handle(ChannelHandlerContext ctx, Http2Connection connection,
60                         Http2FrameListener listener, FullHttpMessage<?> message) throws Http2Exception {
61          int streamId = getStreamId(connection, message.headers());
62          Http2Stream stream = connection.stream(streamId);
63          if (stream == null) {
64              stream = connection.remote().createStream(streamId, false);
65          }
66          message.headers().set(HttpConversionUtil.ExtensionHeaderNames.SCHEME.text(), HttpScheme.HTTP.name());
67          Http2Headers messageHeaders = HttpConversionUtil.toHttp2Headers(message, true);
68          boolean hasContent = message.payload().readableBytes() > 0;
69          boolean hasTrailers = !message.trailingHeaders().isEmpty();
70          listener.onHeadersRead(
71                  ctx, streamId, messageHeaders, 0, !(hasContent || hasTrailers));
72          if (hasContent) {
73              final Buffer payload = message.payload();
74              listener.onDataRead(ctx, streamId, payload, 0, !hasTrailers);
75          }
76          if (hasTrailers) {
77              Http2Headers headers = HttpConversionUtil.toHttp2Headers(message.trailingHeaders(), true);
78              listener.onHeadersRead(ctx, streamId, headers, 0, true);
79          }
80          stream.closeRemoteSide();
81      }
82  }