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index.js
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index.js
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const express = require("express");
const ws = require("ws");
const queryString = require("query-string");
const { v4: uuidv4 } = require("uuid");
const MESSAGE = Object.freeze({
UPDATE: "update",
CREATE: "create",
JOIN: "join",
ADD_VOLUME_URL: "add volume url",
REMOVE_VOLUME_URL: "remove volume media",
ADD_MESH_URL: "add mesh url",
REMOVE_MESH_URL: "remove mesh media",
SET_4D_VOL_INDEX: "set 4d vol index",
UPDATE_IMAGE_OPTIONS: "update image options",
UPDATE_CROSSHAIR_POS: "update crosshair pos",
CROSSHAIR_POS_UPDATED: "crosshair pos updated",
USER_JOINED: "user joined",
UPDATE_SCENE_STATE: "update scene state",
UPDATE_USER_STATE: "update user state",
USER_STATE_UPDATED: "user state updated",
SCENE_STATE_UPDATED: "scene state updated",
ACK: "ack",
SESSION_CREATED: "session created",
SESSION_JOINED: "session joined",
});
let sessionOwnersMap = new Map();
let sessionMap = new Map();
let userMap = new Map();
let connectionUserMap = new Map();
const app = express();
const wsServer = new ws.Server({ noServer: true });
const connections = [];
function sendOtherClientsMessage(sender, msg) {
let others = connections.filter((c) => c != sender);
sendClientsMessage(others, msg);
}
function sendClientsMessage(clientConnections, msg) {
for (const connection of clientConnections) {
connection.send(JSON.stringify(msg));
}
}
/**
* Get a random color to assign user
* @returns {number[]} RGB color
*/
function getRandomColor() {
let color;
switch (Array.from(userMap.values()).length) {
case 0:
color = [1, 0, 0];
case 1:
color = [0, 1, 0];
break;
case 2:
color = [0, 0, 1];
break;
default:
color = [Math.random(), Math.random(), Math.random()];
}
return [...color, 1];
}
function assignUser(parsedMessage) {
let displayName;
let id = uuidv4();
if (parsedMessage.displayName) {
displayName = parsedMessage.displayName;
} else {
displayName = `user-${id}`;
}
let userKey = uuidv4();
let color = parsedMessage.color ? parsedMessage.color : getRandomColor();
let crosshairPos = [0.5, 0.5, 0.5];
userMap.set(userKey, { id, displayName, color, crosshairPos });
return userKey;
}
function getSessionUrl(connectionRequest, session) {
let host = "";
let protocol = "ws://";
for (let i = 0; i < connectionRequest.rawHeaders.length; i++) {
if (connectionRequest.rawHeaders[i] === "Host") {
host = connectionRequest.rawHeaders[i + 1];
} else if (connectionRequest.rawHeaders[i] === "Host") {
}
}
let sessionUrl = new URL(protocol + host);
sessionUrl.pathname = "websockets";
sessionUrl.search = "session=" + session;
return sessionUrl.href;
}
wsServer.on("connection", (websocketConnection, connectionRequest) => {
const [_path, params] = connectionRequest?.url?.split("?");
const connectionParams = queryString.parse(params);
const session = connectionParams["session"];
// console.log('new connection on session ' + session);
if (connections.findIndex((w) => w === websocketConnection) === -1) {
connections.push(websocketConnection);
console.log("added connection");
console.log(connections.length + " connections");
}
let scene = null;
if (session) {
if (sessionMap.has(session)) {
scene = sessionMap.get(session);
}
}
websocketConnection.on("message", (message) => {
const parsedMessage = JSON.parse(message);
let res = {
message: "OK",
op: MESSAGE.ACK,
};
switch (parsedMessage.op) {
case MESSAGE.CREATE:
res.op = MESSAGE.SESSION_CREATED;
// check if we already have the session
if (sessionMap.has(session)) {
res.op = MESSAGE.SESSION_JOINED;
res.message = "session already exists";
res.isError = true;
res["isController"] = parsedMessage.key === scene.key;
res["url"] = getSessionUrl(connectionRequest, session);
res["userList"] = Array.from(userMap.values());
let userKey = assignUser(parsedMessage);
res["userKey"] = userKey;
let user = userMap.get(userKey);
res["userId"] = user.id;
res["userName"] = user.displayName;
// add user as controller
if(res["isController"]) {
sessionOwnersMap.get(session).push(user.id);
}
sendOtherClientsMessage(websocketConnection, {
op: MESSAGE.USER_JOINED,
user: userMap.get(res["userKey"]),
});
} else {
scene = {
elevation: 0,
azimuth: 0,
zoom: 1.0,
cliplane: [0, 0, 0, 0],
key: parsedMessage.key ? parsedMessage.key : uuidv4(),
};
sessionMap.set(session, scene);
console.log("scene created for " + session);
let userKey = assignUser(parsedMessage);
let user = userMap.get(userKey);
res["url"] = getSessionUrl(connectionRequest, session);
res["key"] = scene.key;
res["userId"] = user.id;
res["userKey"] = userKey;
res["userName"] = user.displayName;
res["isController"] = true;
// add this as a session owner
sessionOwnersMap.set(session, [user.id]);
if (!connectionUserMap.has(websocketConnection)) {
connectionUserMap.set(websocketConnection, user.name);
} else {
console.log(
"connection already associatged with " +
connectionUserMap.get(websocketConnection)
);
}
console.log('created session ' + session);
// console.log('url: ' + res['url']);
}
break;
case MESSAGE.UPDATE_SCENE_STATE:
// console.log('update message called');
// only allow requests with session key to update
if (scene.key === parsedMessage.key) {
scene.azimuth = parsedMessage.azimuth;
scene.elevation = parsedMessage.elevation;
scene.zoom = parsedMessage.zoom;
scene.clipPlane = parsedMessage.clipPlane;
// console.log('with correct key');
sendOtherClientsMessage(websocketConnection, {
op: MESSAGE.SCENE_STATE_UPDATED,
message: "OK",
azimuth: scene.azimuth,
elevation: scene.elevation,
zoom: scene.zoom,
clipPlane: scene.clipPlane,
});
}
break;
case MESSAGE.JOIN:
if (scene) {
res.op = MESSAGE.SESSION_JOINED;
res["isController"] = parsedMessage.key === scene.key;
res["url"] = getSessionUrl(connectionRequest, session);
res["userList"] = Array.from(userMap.values());
let userKey = assignUser(parsedMessage);
res["userKey"] = userKey;
let user = userMap.get(userKey);
res["userId"] = user.id;
res["userName"] = user.displayName;
// add user as controller
if(res["isController"]) {
sessionOwnersMap.get(session).push(user.id);
}
if (!connectionUserMap.has(websocketConnection)) {
connectionUserMap.set(websocketConnection, user.id);
} else {
console.log(
"connection already associated with " +
connectionUserMap.get(websocketConnection)
);
}
sendOtherClientsMessage(websocketConnection, {
op: MESSAGE.USER_JOINED,
user: userMap.get(res["userKey"]),
});
} else {
console.log("scene for " + session + " not found");
}
break;
case MESSAGE.UPDATE_IMAGE_OPTIONS:
case MESSAGE.ADD_VOLUME_URL:
if (scene.key === parsedMessage.key) {
let msg = {
op: parsedMessage.op,
urlImageOptions: parsedMessage.urlImageOptions,
};
sendOtherClientsMessage(websocketConnection, msg);
}
break;
case MESSAGE.REMOVE_VOLUME_URL:
if (scene.key === parsedMessage.key) {
sendOtherClientsMessage(websocketConnection, {
op: REMOVE_VOLUME_URL,
url: parsedMessage.url,
});
}
break;
case MESSAGE.SET_4D_VOL_INDEX:
if (scene.key === parsedMessage.key) {
sendOtherClientsMessage(websocketConnection, {
op: MESSAGE.SET_4D_VOL_INDEX,
url: parsedMessage.url,
index: parsedMessage.index,
});
}
break;
case MESSAGE.ADD_MESH_URL:
if (scene.key === parsedMessage.key) {
let msg = {
op: parsedMessage.op,
urlMeshOptions: parsedMessage.urlMeshOptions,
};
sendOtherClientsMessage(websocketConnection, msg);
}
break;
case MESSAGE.REMOVE_MESH_URL:
if (scene.key === parsedMessage.key) {
sendOtherClientsMessage(websocketConnection, {
op: MESSAGE.REMOVE_MESH_URL,
url: parsedMessage.url,
});
}
break;
case MESSAGE.UPDATE_USER_STATE:
if (userMap.has(parsedMessage.userKey)) {
let user = userMap.get(parsedMessage.userKey);
if (parsedMessage.id == user.id) {
user.color = parsedMessage.color;
user.displayName = parsedMessage.displayName;
userMap.set(parsedMessage.userKey, user);
}
}
break;
case MESSAGE.UPDATE_CROSSHAIR_POS:
if (userMap.has(parsedMessage.userKey)) {
let user = userMap.get(parsedMessage.userKey);
if (parsedMessage.id == user.id) {
// console.log("updating crosshairs for " + user.displayName);
// console.log(parsedMessage.crosshairPos);
user.crosshairPos = parsedMessage.crosshairPos;
userMap.set(parsedMessage.userKey, user);
let msg = {
op: MESSAGE.CROSSHAIR_POS_UPDATED,
id: user.id,
isController: sessionOwnersMap.get(session).includes(user.id),
crosshairPos: parsedMessage.crosshairPos,
};
sendOtherClientsMessage(websocketConnection, msg);
}
}
break;
default:
res["op"] = MESSAGE.SCENE_STATE_UPDATED;
res["azimuth"] = scene.azimuth;
res["elevation"] = scene.elevation;
res["zoom"] = scene.zoom;
res["clipPlane"] = scene.clipPlane;
break;
}
// console.log(parsedMessage);
// console.log(res);
websocketConnection.send(JSON.stringify(res));
});
});
// `server` is a vanilla Node.js HTTP server, so use
// the same ws upgrade process described here:
// https://www.npmjs.com/package/ws#multiple-servers-sharing-a-single-https-server
const server = app.listen(3000);
server.on("upgrade", (request, socket, head) => {
wsServer.handleUpgrade(request, socket, head, (socket) => {
wsServer.emit("connection", socket, request);
});
});