|
| 1 | +/* |
| 2 | + * Copyright 2019 Alex Andres |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://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, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package dev.onvoid.webrtc.demo.apprtc; |
| 18 | + |
| 19 | +import static java.util.Objects.isNull; |
| 20 | +import static java.util.Objects.nonNull; |
| 21 | + |
| 22 | +import dev.onvoid.webrtc.RTCIceCandidate; |
| 23 | +import dev.onvoid.webrtc.RTCIceServer; |
| 24 | +import dev.onvoid.webrtc.RTCSdpType; |
| 25 | +import dev.onvoid.webrtc.RTCSessionDescription; |
| 26 | +import dev.onvoid.webrtc.demo.apprtc.AppRTCMessage.Type; |
| 27 | + |
| 28 | +import java.io.StringReader; |
| 29 | +import java.io.StringWriter; |
| 30 | +import java.util.ArrayList; |
| 31 | +import java.util.List; |
| 32 | +import java.util.Map; |
| 33 | + |
| 34 | +import javax.json.Json; |
| 35 | +import javax.json.JsonArray; |
| 36 | +import javax.json.JsonArrayBuilder; |
| 37 | +import javax.json.JsonBuilderFactory; |
| 38 | +import javax.json.JsonObject; |
| 39 | +import javax.json.JsonObjectBuilder; |
| 40 | +import javax.json.JsonReader; |
| 41 | +import javax.json.JsonWriter; |
| 42 | + |
| 43 | +public class AppRTCJsonCodec { |
| 44 | + |
| 45 | + AppRTCSignalingParameters toSignalingParameters(String json) { |
| 46 | + JsonReader reader = Json.createReader(new StringReader(json)); |
| 47 | + JsonObject room = reader.readObject(); |
| 48 | + |
| 49 | + String result = room.getString("result"); |
| 50 | + if (!result.equals("SUCCESS")) { |
| 51 | + throw new RuntimeException("Room response error: " + result); |
| 52 | + } |
| 53 | + |
| 54 | + room = room.getJsonObject("params"); |
| 55 | + |
| 56 | + String clientId = room.getString("client_id"); |
| 57 | + String wssUrl = room.getString("wss_url"); |
| 58 | + String wssPostUrl = room.getString("wss_post_url"); |
| 59 | + String iceServerUrl = room.getString("ice_server_url"); |
| 60 | + boolean initiator = Boolean.parseBoolean(room.getString("is_initiator")); |
| 61 | + |
| 62 | + List<RTCIceCandidate> iceCandidates = null; |
| 63 | + RTCSessionDescription offer = null; |
| 64 | + |
| 65 | + if (!initiator) { |
| 66 | + iceCandidates = new ArrayList<>(); |
| 67 | + JsonArray messages = room.getJsonArray("messages"); |
| 68 | + |
| 69 | + for (int i = 0; i < messages.size(); ++i) { |
| 70 | + String messageString = messages.getString(i); |
| 71 | + |
| 72 | + reader = Json.createReader(new StringReader(messageString)); |
| 73 | + |
| 74 | + JsonObject message = reader.readObject(); |
| 75 | + String messageType = message.getString("type"); |
| 76 | + |
| 77 | + if (messageType.equals("offer")) { |
| 78 | + offer = new RTCSessionDescription( |
| 79 | + RTCSdpType.valueOf(messageType.replace("_", "").toUpperCase()), |
| 80 | + message.getString("sdp")); |
| 81 | + } |
| 82 | + else if (messageType.equals("candidate")) { |
| 83 | + RTCIceCandidate candidate = new RTCIceCandidate( |
| 84 | + message.getString("id"), |
| 85 | + message.getInt("label"), |
| 86 | + message.getString("candidate")); |
| 87 | + |
| 88 | + iceCandidates.add(candidate); |
| 89 | + } |
| 90 | + } |
| 91 | + } |
| 92 | + |
| 93 | + List<RTCIceServer> iceServers = toJavaIceServers(room.getString("pc_config")); |
| 94 | + |
| 95 | + return new AppRTCSignalingParameters(iceServers, initiator, clientId, |
| 96 | + wssUrl, wssPostUrl, iceServerUrl, |
| 97 | + offer, iceCandidates); |
| 98 | + } |
| 99 | + |
| 100 | + String toJsonCommand(AppRTCCommand command) { |
| 101 | + JsonObjectBuilder builder = Json.createObjectBuilder(); |
| 102 | + |
| 103 | + if (command instanceof AppRTCRegisterCommand) { |
| 104 | + AppRTCRegisterCommand registerCommand = (AppRTCRegisterCommand) command; |
| 105 | + |
| 106 | + builder.add("cmd", registerCommand.getCommand()); |
| 107 | + builder.add("roomid", registerCommand.getRoomId()); |
| 108 | + builder.add("clientid", registerCommand.getClientId()); |
| 109 | + } |
| 110 | + else if (command instanceof AppRTCSendCommand) { |
| 111 | + AppRTCSendCommand sendCommand = (AppRTCSendCommand) command; |
| 112 | + |
| 113 | + builder.add("cmd", sendCommand.getCommand()); |
| 114 | + builder.add("msg", sendCommand.getMessage()); |
| 115 | + } |
| 116 | + |
| 117 | + return build(builder); |
| 118 | + } |
| 119 | + |
| 120 | + String toJsonMessage(AppRTCMessage message) { |
| 121 | + JsonObjectBuilder builder = Json.createObjectBuilder(); |
| 122 | + |
| 123 | + switch (message.getType()) { |
| 124 | + case CANDIDATE: |
| 125 | + RTCIceCandidate candidate = (RTCIceCandidate) message.getObject(); |
| 126 | + |
| 127 | + builder.add("type", "candidate"); |
| 128 | + builder.add("label", candidate.sdpMLineIndex); |
| 129 | + builder.add("id", candidate.sdpMid); |
| 130 | + builder.add("candidate", candidate.sdp); |
| 131 | + break; |
| 132 | + |
| 133 | + case REMOVE_CANDIDATES: |
| 134 | + RTCIceCandidate[] candidates = (RTCIceCandidate[]) message.getObject(); |
| 135 | + JsonBuilderFactory factory = Json.createBuilderFactory(Map.of()); |
| 136 | + JsonArrayBuilder jsonArray = factory.createArrayBuilder(); |
| 137 | + |
| 138 | + for (RTCIceCandidate c : candidates) { |
| 139 | + jsonArray.add(toJsonCandidate(c)); |
| 140 | + } |
| 141 | + |
| 142 | + builder.add("type", "remove-candidates"); |
| 143 | + builder.add("candidates", jsonArray); |
| 144 | + break; |
| 145 | + |
| 146 | + case ANSWER: |
| 147 | + RTCSessionDescription answer = (RTCSessionDescription) message.getObject(); |
| 148 | + |
| 149 | + builder.add("type", "answer"); |
| 150 | + builder.add("sdp", answer.sdp); |
| 151 | + break; |
| 152 | + |
| 153 | + case OFFER: |
| 154 | + RTCSessionDescription offer = (RTCSessionDescription) message.getObject(); |
| 155 | + |
| 156 | + builder.add("type", "offer"); |
| 157 | + builder.add("sdp", offer.sdp); |
| 158 | + break; |
| 159 | + |
| 160 | + case BYE: |
| 161 | + builder.add("type", "bye"); |
| 162 | + break; |
| 163 | + |
| 164 | + default: |
| 165 | + break; |
| 166 | + } |
| 167 | + |
| 168 | + return build(builder); |
| 169 | + } |
| 170 | + |
| 171 | + AppRTCMessage toJavaMessage(String json) { |
| 172 | + JsonReader reader = Json.createReader(new StringReader(json)); |
| 173 | + JsonObject jsonObject = reader.readObject(); |
| 174 | + |
| 175 | + String msgText = jsonObject.getString("msg"); |
| 176 | + String errorText = jsonObject.getString("error"); |
| 177 | + |
| 178 | + if (msgText.length() > 0) { |
| 179 | + reader = Json.createReader(new StringReader(msgText)); |
| 180 | + jsonObject = reader.readObject(); |
| 181 | + String type = jsonObject.getString("type"); |
| 182 | + |
| 183 | + switch (type) { |
| 184 | + case "candidate": |
| 185 | + return new AppRTCMessage(Type.CANDIDATE, |
| 186 | + toJavaCandidate(jsonObject)); |
| 187 | + |
| 188 | + case "remove-candidates": |
| 189 | + return new AppRTCMessage(Type.REMOVE_CANDIDATES, |
| 190 | + toJavaCandidates(jsonObject)); |
| 191 | + |
| 192 | + case "answer": |
| 193 | + return new AppRTCMessage(Type.ANSWER, |
| 194 | + toJavaSessionDescription(jsonObject)); |
| 195 | + |
| 196 | + case "offer": |
| 197 | + return new AppRTCMessage(Type.OFFER, |
| 198 | + toJavaSessionDescription( jsonObject)); |
| 199 | + |
| 200 | + case "bye": |
| 201 | + return new AppRTCMessage(Type.BYE); |
| 202 | + |
| 203 | + default: |
| 204 | + return new AppRTCMessage(Type.ERROR, |
| 205 | + "Unexpected message: " + json); |
| 206 | + } |
| 207 | + } |
| 208 | + else { |
| 209 | + if (nonNull(errorText) && errorText.length() > 0) { |
| 210 | + return new AppRTCMessage(Type.ERROR, errorText); |
| 211 | + } |
| 212 | + else { |
| 213 | + return new AppRTCMessage(Type.ERROR, |
| 214 | + "Unexpected message: " + json); |
| 215 | + } |
| 216 | + } |
| 217 | + } |
| 218 | + |
| 219 | + List<RTCIceServer> toJavaIceServers(String json) { |
| 220 | + JsonReader reader = Json.createReader(new StringReader(json)); |
| 221 | + JsonObject jsonObject = reader.readObject(); |
| 222 | + JsonArray servers = jsonObject.getJsonArray("iceServers"); |
| 223 | + |
| 224 | + List<RTCIceServer> result = new ArrayList<>(); |
| 225 | + |
| 226 | + if (isNull(servers)) { |
| 227 | + return result; |
| 228 | + } |
| 229 | + |
| 230 | + for (int i = 0; i < servers.size(); ++i) { |
| 231 | + JsonObject server = servers.getJsonObject(i); |
| 232 | + JsonArray urls = server.getJsonArray("urls"); |
| 233 | + |
| 234 | + String credential = server.containsKey("credential") ? |
| 235 | + server.getString("credential") : |
| 236 | + ""; |
| 237 | + String username = server.containsKey("username") ? |
| 238 | + server.getString("username") : |
| 239 | + ""; |
| 240 | + |
| 241 | + RTCIceServer iceServer = new RTCIceServer(); |
| 242 | + iceServer.username = username; |
| 243 | + iceServer.password = credential; |
| 244 | + |
| 245 | + for (int j = 0; j < urls.size(); j++) { |
| 246 | + iceServer.urls.add(urls.getString(j)); |
| 247 | + } |
| 248 | + |
| 249 | + result.add(iceServer); |
| 250 | + } |
| 251 | + |
| 252 | + return result; |
| 253 | + } |
| 254 | + |
| 255 | + String toJavaPostResponse(String response) { |
| 256 | + JsonReader reader = Json.createReader(new StringReader(response)); |
| 257 | + JsonObject roomJson = reader.readObject(); |
| 258 | + |
| 259 | + return roomJson.getString("result"); |
| 260 | + } |
| 261 | + |
| 262 | + private JsonObject toJsonCandidate(final RTCIceCandidate candidate) { |
| 263 | + JsonObjectBuilder builder = Json.createObjectBuilder() |
| 264 | + .add("label", candidate.sdpMLineIndex) |
| 265 | + .add("id", candidate.sdpMid) |
| 266 | + .add("candidate", candidate.sdp); |
| 267 | + |
| 268 | + return builder.build(); |
| 269 | + } |
| 270 | + |
| 271 | + private RTCIceCandidate toJavaCandidate(JsonObject json) { |
| 272 | + return new RTCIceCandidate(json.getString("id"), |
| 273 | + json.getInt("label"), |
| 274 | + json.getString("candidate")); |
| 275 | + } |
| 276 | + |
| 277 | + private RTCIceCandidate[] toJavaCandidates(JsonObject json) { |
| 278 | + JsonArray candidateArray = json.getJsonArray("candidates"); |
| 279 | + RTCIceCandidate[] candidates = new RTCIceCandidate[candidateArray.size()]; |
| 280 | + |
| 281 | + for (int i = 0; i < candidateArray.size(); ++i) { |
| 282 | + candidates[i] = toJavaCandidate(candidateArray.getJsonObject(i)); |
| 283 | + } |
| 284 | + |
| 285 | + return candidates; |
| 286 | + } |
| 287 | + |
| 288 | + private RTCSessionDescription toJavaSessionDescription(JsonObject json) { |
| 289 | + String type = json.getString("type"); |
| 290 | + |
| 291 | + return new RTCSessionDescription( |
| 292 | + RTCSdpType.valueOf(type.replace("_", "").toUpperCase()), |
| 293 | + json.getString("sdp")); |
| 294 | + } |
| 295 | + |
| 296 | + private static String build(JsonObjectBuilder builder) { |
| 297 | + JsonObject json = builder.build(); |
| 298 | + |
| 299 | + if (isNull(json) || json.isEmpty()) { |
| 300 | + return null; |
| 301 | + } |
| 302 | + |
| 303 | + StringWriter stringWriter = new StringWriter(); |
| 304 | + |
| 305 | + JsonWriter writer = Json.createWriter(stringWriter); |
| 306 | + writer.writeObject(json); |
| 307 | + writer.close(); |
| 308 | + |
| 309 | + return stringWriter.toString(); |
| 310 | + } |
| 311 | + |
| 312 | +} |
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