1 /*
2 * Copyright 2021 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.netty.handler.codec.http3;
17
18 /**
19 * Validate that the frame type is valid for a control stream.
20 */
21 final class Http3ControlStreamFrameTypeValidator implements Http3FrameTypeValidator {
22
23 static final Http3ControlStreamFrameTypeValidator INSTANCE = new Http3ControlStreamFrameTypeValidator();
24
25 private Http3ControlStreamFrameTypeValidator() { }
26
27 @Override
28 public void validate(long type, boolean first) throws Http3Exception {
29 switch ((int) type) {
30 case Http3CodecUtils.HTTP3_PUSH_PROMISE_FRAME_TYPE:
31 case Http3CodecUtils.HTTP3_HEADERS_FRAME_TYPE:
32 case Http3CodecUtils.HTTP3_DATA_FRAME_TYPE:
33 if (first) {
34 throw new Http3Exception(Http3ErrorCode.H3_MISSING_SETTINGS,
35 "Missing settings frame.");
36 }
37 throw new Http3Exception(Http3ErrorCode.H3_FRAME_UNEXPECTED,
38 "Unexpected frame type '" + type + "' received");
39 default:
40 break;
41 }
42 }
43 }