infrastructure/excalidraw-backend/build.py

@@ -0,0 +1,57 @@
+from os import environ
+from datetime import datetime
+from pybuilder.core import task, init
+from ddadevops import *
+
+name = "excalidraw-backend"
+MODULE = "excalidraw-backend"
+PROJECT_ROOT_PATH = "../.."
+version = "1.4.2-SNAPSHOT"
+
+
+@init
+def initialize(project):
+    image_tag = version
+    if "dev" in image_tag:
+        image_tag += datetime.now().strftime("%Y-%m-%d-%H-%M-%S")
+
+    input = {
+        "name": name,
+        "module": MODULE,
+        "stage": "notused",
+        "project_root_path": PROJECT_ROOT_PATH,
+        "build_types": ["IMAGE"],
+        "mixin_types": [],
+        "image_naming": "NAME_ONLY",
+        "image_tag": f"{image_tag}",
+    }
+
+    project.build_depends_on("ddadevops>=4.7.0")
+
+    build = DevopsImageBuild(project, input)
+    build.initialize_build_dir()
+
+
+@task
+def image(project):
+    build = get_devops_build(project)
+    build.image()
+
+
+@task
+def drun(project):
+    build = get_devops_build(project)
+    build.drun()
+
+
+@task
+def test(project):
+    build = get_devops_build(project)
+    build.test()
+
+
+@task
+def publish(project):
+    build = get_devops_build(project)
+    build.dockerhub_login()
+    build.dockerhub_publish()

infrastructure/excalidraw-backend/image/Dockerfile

@@ -0,0 +1,14 @@
+# Taken from: https://github.com/jitsi/excalidraw-backend
+FROM node:16.17-slim
+
+WORKDIR /excalidraw-backend
+
+
+COPY resources/package.json resources/package-lock.json resources/tsconfig.json resources/src ./
+RUN npm install
+RUN npm run build
+
+EXPOSE 80
+EXPOSE 9090
+
+CMD ["npm", "start"]

infrastructure/excalidraw-backend/image/resources/package.json

@@ -0,0 +1,52 @@
+{
+    "name": "excalidraw-backend",
+    "version": "1.0.0",
+    "main": "src/index.js",
+    "description": "Excalidraw backend",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/jitsi/excalidraw-backend"
+    },
+    "private": true,
+    "engines": {
+        "node": ">=14.0.0",
+        "npm": ">=7.0.0"
+    },
+    "dependencies": {
+        "@types/debug": "4.1.5",
+        "@types/express": "4.17.11",
+        "@types/node": "14.14.31",
+        "@types/socket.io": "2.1.4",
+        "cross-env": "^7.0.3",
+        "debug": "4.3.1",
+        "dotenv": "^10.0.0",
+        "express": "4.17.1",
+        "socket.io": "^2.5.0",
+        "socket.io-prometheus-metrics": "^1.0.6",
+        "ts-node-dev": "^1.1.8",
+        "typescript": "4.2.3"
+    },
+    "license": "MIT",
+    "scripts": {
+        "build": "tsc",
+        "lint": "eslint .",
+        "lint-fix": "eslint . --fix",
+        "start": "tsc && node dist/index.js",
+        "start:local": "tsc && DEBUG='engine,app,socket.io:client,server' node dist/index.js",
+        "start:dev": "cross-env NODE_ENV=development ts-node-dev --respawn --transpile-only src/index.ts"
+    },
+    "devDependencies": {
+        "@jitsi/eslint-config": "^4.1.0",
+        "@types/dotenv": "^8.2.0",
+        "@typescript-eslint/eslint-plugin": "5.30.5",
+        "@typescript-eslint/parser": "5.30.4",
+        "eslint": "8.1.0",
+        "eslint-plugin-import": "2.25.2",
+        "eslint-plugin-jsdoc": "37.0.3",
+        "eslint-plugin-typescript-sort-keys": "^2.1.0"
+    },
+    "optionalDependencies": {
+        "bufferutil": "^4.0.6",
+        "utf-8-validate": "^5.0.9"
+    }
+}

infrastructure/excalidraw-backend/image/resources/src/.eslintrc.js

@@ -0,0 +1,7 @@
+module.exports = {
+    extends: [
+        '@jitsi/eslint-config',
+        '@jitsi/eslint-config/jsdoc',
+        '@jitsi/eslint-config/typescript',
+    ],
+};

infrastructure/excalidraw-backend/image/resources/src/index.ts

@@ -0,0 +1,105 @@
+import debug from 'debug';
+import dotenv from 'dotenv';
+import express from 'express';
+import http from 'http';
+import socketIO from 'socket.io';
+import * as prometheus from 'socket.io-prometheus-metrics';
+
+const serverDebug = debug('server');
+
+dotenv.config(
+  process.env.NODE_ENV === 'development'
+      ? { path: '.env.development' }
+      : { path: '.env.production' }
+);
+
+const app = express();
+const port = process.env.PORT || 80; // default port to listen
+
+app.get('/', (req, res) => {
+    res.send('Excalidraw backend is up :)');
+});
+
+const server = http.createServer(app);
+
+server.listen(port, () => {
+    serverDebug(`listening on port: ${port}`);
+});
+
+const io = socketIO(server, {
+    handlePreflightRequest: (req, res) => {
+        const headers = {
+            'Access-Control-Allow-Headers': 'Content-Type, Authorization',
+            'Access-Control-Allow-Origin': req.header?.origin ?? 'https://meet.jit.si',
+            'Access-Control-Allow-Credentials': true
+        };
+
+        res.writeHead(200, headers);
+        res.end();
+    },
+    maxHttpBufferSize: 10e6,
+    pingTimeout: 10000
+});
+
+// listens on host:9090/metrics
+prometheus.metrics(io, {
+    collectDefaultMetrics: true
+});
+
+io.on('connection', socket => {
+    serverDebug(`connection established! ${socket.conn.request.url}`);
+    io.to(`${socket.id}`).emit('init-room');
+    socket.on('join-room', roomID => {
+        serverDebug(`${socket.id} has joined ${roomID} for url ${socket.conn.request.url}`);
+        socket.join(roomID);
+        if (io.sockets.adapter.rooms[roomID].length <= 1) {
+            io.to(`${socket.id}`).emit('first-in-room');
+        } else {
+            socket.broadcast.to(roomID).emit('new-user', socket.id);
+        }
+        io.in(roomID).emit(
+            'room-user-change',
+            Object.keys(io.sockets.adapter.rooms[roomID].sockets)
+        );
+    });
+
+    socket.on(
+    'server-broadcast',
+        (roomID: string, encryptedData: ArrayBuffer, iv: Uint8Array) => {
+            socket.broadcast.to(roomID).emit('client-broadcast', encryptedData, iv);
+        }
+    );
+
+    socket.on(
+    'server-volatile-broadcast',
+    (roomID: string, encryptedData: ArrayBuffer, iv: Uint8Array) => {
+        socket.volatile.broadcast
+        .to(roomID)
+        .emit('client-broadcast', encryptedData, iv);
+    }
+    );
+
+    socket.on('disconnecting', () => {
+        const rooms = io.sockets.adapter.rooms;
+
+        for (const roomID of Object.keys(socket.rooms)) {
+            const clients = Object.keys(rooms[roomID].sockets).filter(id => id !== socket.id);
+
+            if (roomID !== socket.id) {
+                socket.to(roomID).emit('user has left', socket.id);
+            }
+
+            if (clients.length > 0) {
+                socket.broadcast.to(roomID).emit('room-user-change', clients);
+            }
+        }
+    });
+
+    socket.on('disconnect', (reason, details) => {
+        serverDebug(
+            `${socket.id} was disconnected from url ${socket.conn.request.url} for the following reason: ${reason}
+            ${JSON.stringify(details)}`
+        );
+        socket.removeAllListeners();
+    });
+});

infrastructure/excalidraw-backend/image/resources/tsconfig.json

@@ -0,0 +1,17 @@
+{
+    "compilerOptions": {
+        "allowSyntheticDefaultImports": true,
+        "target": "es5",
+        "lib": ["dom", "dom.iterable", "esnext"],
+        "allowJs": true,
+        "skipLibCheck": true,
+        "esModuleInterop": true,
+        "strict": true,
+        "moduleResolution": "Node",
+        "forceConsistentCasingInFileNames": true,
+        "resolveJsonModule": true,
+        "isolatedModules": true,
+        "outDir": "dist"
+    }
+  }
+