slash

.env.development

@@ -1,2 +0,0 @@
-PORT=
-CORS_ORIGIN=

.eslintrc.json

@@ -1,3 +0,0 @@
-{
-  "extends": "@excalidraw/eslint-config"
-}

.gcloudignore

@@ -0,0 +1,5 @@
+# Exclude compiled .js files
+*.js
+
+# Exclude dependencies
+node_modules/

.github/dependabot.yml

@@ -1,8 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: npm
-    directory: /
-    schedule:
-      interval: weekly
-      day: sunday
-      time: "01:00"

.github/workflows/lint.yml

@@ -1,18 +1,20 @@
 name: Lint
 
-on:
+on: pull_request
-  push:
 
 jobs:
   lint:
     runs-on: ubuntu-latest
+
     steps:
       - uses: actions/checkout@v1
-      - name: Setup Node.js 14.x
+
+      - name: Setup Node.js 12.x
         uses: actions/setup-node@v1
         with:
-          node-version: 14.x
+          node-version: 12.x
-      - name: Install dependencies
+
-        run: yarn --frozen-lockfile
+      - name: Install and lint
-      - name: Lint
+        run: |
-        run: yarn test:other
+          yarn
+          yarn lint

.github/workflows/publish-docker.yml

@@ -1,19 +0,0 @@
-name: Publish Docker
-
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  publish-docker:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: docker/build-push-action@v1
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
-          repository: excalidraw/excalidraw-room
-          tag_with_ref: true
-          tag_with_sha: true

.github/workflows/test.yml

@@ -1,20 +0,0 @@
-name: Test & Build
-
-on:
-  push:
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v1
-      - name: Setup Node.js 14.x
-        uses: actions/setup-node@v1
-        with:
-          node-version: 14.x
-      - name: Install dependencies
-        run: yarn --frozen-lockfile
-      - name: Test and Build
-        run: |
-          yarn test:code
-          yarn build

.gitignore

@@ -1,108 +1,3 @@
-# Logs
+*.js
-logs
+node_modules
-*.log
+yarn-error.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-lerna-debug.log*
-
-# Diagnostic reports (https://nodejs.org/api/report.html)
-report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
-
-# Runtime data
-pids
-*.pid
-*.seed
-*.pid.lock
-
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
-# Coverage directory used by tools like istanbul
-coverage
-*.lcov
-
-# nyc test coverage
-.nyc_output
-
-# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
-# Bower dependency directory (https://bower.io/)
-bower_components
-
-# node-waf configuration
-.lock-wscript
-
-# Compiled binary addons (https://nodejs.org/api/addons.html)
-build/Release
-
-# Dependency directories
-node_modules/
-jspm_packages/
-
-# TypeScript v1 declaration files
-typings/
-
-# TypeScript cache
-*.tsbuildinfo
-
-# Optional npm cache directory
-.npm
-
-# Optional eslint cache
-.eslintcache
-
-# Microbundle cache
-.rpt2_cache/
-.rts2_cache_cjs/
-.rts2_cache_es/
-.rts2_cache_umd/
-
-# Optional REPL history
-.node_repl_history
-
-# Output of 'npm pack'
-*.tgz
-
-# Yarn Integrity file
-.yarn-integrity
-
-# dotenv environment variables file
-.env
-.env.test
-.env.production
-
-# parcel-bundler cache (https://parceljs.org/)
-.cache
-
-# Next.js build output
-.next
-
-# Nuxt.js build / generate output
-.nuxt
-dist
-
-# Gatsby files
-.cache/
-# Comment in the public line in if your project uses Gatsby and *not* Next.js
-# https://nextjs.org/blog/next-9-1#public-directory-support
-# public
-
-# vuepress build output
-.vuepress/dist
-
-# Serverless directories
-.serverless/
-
-# FuseBox cache
-.fusebox/
-
-# DynamoDB Local files
-.dynamodb/
-
-# TernJS port file
-.tern-port
-
-.DS_Store
-dist

.prettierrc

@@ -0,0 +1 @@
+{}

Dockerfile

@@ -1,13 +0,0 @@
-FROM node:12-alpine
-
-WORKDIR /excalidraw-room
-
-COPY package.json yarn.lock ./
-RUN yarn
-
-COPY tsconfig.json ./
-COPY src ./src
-RUN yarn build
-
-EXPOSE 80
-CMD ["yarn", "start"]

README.md

@@ -1,27 +1,30 @@
-# Example of excalidraw collaboration server
+# excalidraw-room
 
-Collaboration server for Excalidraw
+The backend for collaboration in [Excalidraw](https://excalidraw.com).
 
-If you need to use cluster mode with pm2. Checkout: https://socket.io/docs/v4/pm2/
+## Requirements
 
-If you are not familiar with pm2: https://pm2.keymetrics.io/docs/usage/quick-start/
+- [Node.js](https://nodejs.org)
+- [Google Cloud SDK](https://cloud.google.com/sdk/)
 
-# Development
+## Install dependencies
 
-- install
+```
-
-  ```sh
 yarn
 ```
 
-- run development server
+## Run locally
-
-  ```sh
-  yarn start:dev
-  ```
-
-# Start with pm2
 
 ```
-pm2 start pm2.production.json
+yarn start
+```
+
+Visit [`localhost:8080`](http://localhost:8080) to test it.
+
+## Deploy to GCP
+
+Make sure you have access to the [`excalidraw-room`](https://console.cloud.google.com/home/dashboard?project=excalidraw-room) project.
+
+```
+yarn deploy
 ```

app.yaml

@@ -0,0 +1,2 @@
+runtime: nodejs
+env: flex

index.ts

@@ -0,0 +1,70 @@
+// source: https://github.com/idlewinn/collab-server/blob/master/src/index.ts
+
+import express from "express";
+import http from "http";
+import socketIO from "socket.io";
+
+const app = express();
+const port = process.env.PORT || 8080;
+
+app.get("/", (req, res) => {
+  res.send("Hi, excalidraw-room!");
+});
+
+const server = http.createServer(app);
+
+server.listen(port, () => {
+  console.log(`listening on port: ${port}`);
+});
+
+const io = socketIO(server, {
+  handlePreflightRequest: function(req, res) {
+    var headers = {
+      "Access-Control-Allow-Headers": "Content-Type, Authorization",
+      "Access-Control-Allow-Origin": req.header ? req.header.origin : "*",
+      "Access-Control-Allow-Credentials": true
+    };
+    res.writeHead(200, headers);
+    res.end();
+  }
+});
+
+io.on("connection", socket => {
+  console.log("connection established!");
+  io.to(`${socket.id}`).emit("init-room");
+  socket.on("join-room", roomID => {
+    console.log(`${socket.id} has joined ${roomID}`);
+    socket.join(roomID);
+    if (io.sockets.adapter.rooms[roomID].length <= 1) {
+      io.to(`${socket.id}`).emit("first-in-room");
+    } else {
+      socket.broadcast.to(roomID).emit("new-user", socket.id);
+    }
+    io.in(roomID).emit(
+      "room-user-count",
+      io.sockets.adapter.rooms[roomID].length
+    );
+  });
+
+  socket.on(
+    "server-broadcast",
+    (roomID: string, encryptedData: ArrayBuffer, iv: Uint8Array) => {
+      console.log(`${socket.id} sends update to ${roomID}`);
+      socket.broadcast.to(roomID).emit("client-broadcast", encryptedData, iv);
+    }
+  );
+
+  socket.on("disconnecting", () => {
+    const rooms = io.sockets.adapter.rooms;
+    for (const roomID in socket.rooms) {
+      const remaining = rooms[roomID].length - 1;
+      if (remaining > 0) {
+        socket.broadcast.to(roomID).emit("room-user-count", remaining);
+      }
+    }
+  });
+
+  socket.on("disconnect", () => {
+    socket.removeAllListeners();
+  });
+});

package.json

@@ -1,39 +1,41 @@
 {
   "dependencies": {
-    "@excalidraw/eslint-config": "1.0.1",
+    "@types/express": "4.17.3",
-    "@excalidraw/prettier-config": "1.0.2",
+    "@types/node": "13.9.0",
-    "@types/debug": "4.1.5",
+    "@types/socket.io": "2.1.4",
-    "@types/express": "4.17.11",
-    "@types/node": "14.14.31",
-    "@typescript-eslint/eslint-plugin": "4.16.1",
-    "@typescript-eslint/parser": "4.16.1",
-    "cross-env": "^7.0.3",
-    "debug": "4.3.1",
-    "dotenv": "^10.0.0",
-    "eslint": "7.21.0",
-    "eslint-config-prettier": "8.1.0",
-    "eslint-plugin-prettier": "3.3.1",
     "express": "4.17.1",
-    "prettier": "2.2.1",
+    "socket.io": "2.3.0",
-    "socket.io": "^4.6.1",
+    "typescript": "3.8.3"
-    "ts-node-dev": "^1.1.8",
+  },
-    "typescript": "4.2.3"
+  "devDependencies": {
+    "husky": "4.2.3",
+    "lint-staged": "10.0.8",
+    "prettier": "1.19.1"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
   },
   "license": "MIT",
-  "main": "dist/index.js",
+  "lint-staged": {
-  "name": "excalidraw-portal",
+    "*.{ts,md,json,yaml,yml}": [
-  "prettier": "@excalidraw/prettier-config",
+      "prettier --write"
+    ]
+  },
+  "main": "index.js",
+  "name": "excalidraw-room",
   "scripts": {
-    "build": "tsc",
+    "build": "yarn gcp-build",
-    "fix:code": "yarn test:code --fix",
+    "deploy": "gcloud app deploy --project=excalidraw-room",
-    "fix:other": "yarn prettier --write",
+    "fix": "yarn prettier --write",
-    "fix": "yarn fix:other && yarn fix:code",
+    "gcp-build": "tsc -p .",
-    "prettier": "prettier . --ignore-path=.gitignore",
+    "lint": "yarn prettier --list-different",
-    "start": "node dist/index.js",
+    "prepare": "yarn gcp-build",
-    "start:dev": "cross-env NODE_ENV=development ts-node-dev --respawn --transpile-only src/index.ts",
+    "pretest": "yarn gcp-build",
-    "test:code": "eslint --ext .ts .",
+    "prettier": "prettier \"**/*.{ts,md,json,yaml,yml}\"",
-    "test:other": "yarn prettier --list-different",
+    "start": "yarn build && node ./index.js",
-    "test": "yarn test:other && yarn test:code"
+    "test": "yarn lint"
   },
   "version": "1.0.0"
 }

pm2.json

@@ -1,14 +0,0 @@
-{
-  "name": "excalidraw-collab-dev",
-  "script": "./dist/index.js",
-  "watch": ["src/"],
-  "ignore_watch": ["node_modules", "public"],
-  "autorestart": false,
-  "exec_mode": "fork_mode",
-  "instances": 1,
-  "env": {
-    "NODE_ENV": "development",
-    "TZ": "Europe/London"
-  },
-  "node_args": ["--inspect=127.0.0.1:9320"]
-}

pm2.production.json

@@ -1,15 +0,0 @@
-{
-  "name": "excalidraw-collab",
-  "script": "./dist/index.js",
-  "ignore_watch": ["node_modules", "public"],
-  "max_memory_restart": "4G",
-  "watch": false,
-  "wait_ready": true,
-  "log_date_format": "YYYY-MM-DD HH:mm Z",
-  "autorestart": true,
-  "exec_mode": "fork_mode",
-  "instances": 1,
-  "env": {
-    "NODE_ENV": "production"
-  }
-}

src/index.ts

@@ -1,104 +0,0 @@
-import debug from "debug";
-import express from "express";
-import http from "http";
-import { Server as SocketIO } from "socket.io";
-
-const serverDebug = debug("server");
-const ioDebug = debug("io");
-const socketDebug = debug("socket");
-
-require("dotenv").config(
-  process.env.NODE_ENV !== "development"
-    ? { path: ".env.production" }
-    : { path: ".env.development" },
-);
-
-const app = express();
-const port =
-  process.env.PORT || (process.env.NODE_ENV !== "development" ? 80 : 3002); // default port to listen
-
-app.use(express.static("public"));
-
-app.get("/", (req, res) => {
-  res.send("Excalidraw collaboration server is up :)");
-});
-
-const server = http.createServer(app);
-
-server.listen(port, () => {
-  serverDebug(`listening on port: ${port}`);
-});
-
-try {
-  const io = new SocketIO(server, {
-    transports: ["websocket", "polling"],
-    cors: {
-      allowedHeaders: ["Content-Type", "Authorization"],
-      origin: process.env.CORS_ORIGIN || "*",
-      credentials: true,
-    },
-    allowEIO3: true,
-  });
-
-  io.on("connection", (socket) => {
-    ioDebug("connection established!");
-    io.to(`${socket.id}`).emit("init-room");
-    socket.on("join-room", async (roomID) => {
-      socketDebug(`${socket.id} has joined ${roomID}`);
-      await socket.join(roomID);
-      const sockets = await io.in(roomID).fetchSockets();
-      if (sockets.length <= 1) {
-        io.to(`${socket.id}`).emit("first-in-room");
-      } else {
-        socketDebug(`${socket.id} new-user emitted to room ${roomID}`);
-        socket.broadcast.to(roomID).emit("new-user", socket.id);
-      }
-
-      io.in(roomID).emit(
-        "room-user-change",
-        sockets.map((socket) => socket.id),
-      );
-    });
-
-    socket.on(
-      "server-broadcast",
-      (roomID: string, encryptedData: ArrayBuffer, iv: Uint8Array) => {
-        socketDebug(`${socket.id} sends update to ${roomID}`);
-        socket.broadcast.to(roomID).emit("client-broadcast", encryptedData, iv);
-      },
-    );
-
-    socket.on(
-      "server-volatile-broadcast",
-      (roomID: string, encryptedData: ArrayBuffer, iv: Uint8Array) => {
-        socketDebug(`${socket.id} sends volatile update to ${roomID}`);
-        socket.volatile.broadcast
-          .to(roomID)
-          .emit("client-broadcast", encryptedData, iv);
-      },
-    );
-
-    socket.on("disconnecting", async () => {
-      socketDebug(`${socket.id} has disconnected`);
-      for (const roomID in socket.rooms) {
-        const otherClients = (await io.in(roomID).fetchSockets()).filter(
-          (_socket) => _socket.id !== socket.id,
-        );
-
-        if (otherClients.length > 0) {
-          socket.broadcast.to(roomID).emit(
-            "room-user-change",
-            otherClients.map((socket) => socket.id),
-          );
-        }
-      }
-    });
-
-    socket.on("disconnect", () => {
-      socket.removeAllListeners();
-      socket.disconnect();
-    });
-  });
-} catch (error) {
-  console.error(error);
-}

tsconfig.json

@@ -1,16 +1,8 @@
 {
   "compilerOptions": {
     "target": "es5",
-    "lib": ["dom", "dom.iterable", "esnext"],
-    "allowJs": true,
-    "skipLibCheck": true,
     "esModuleInterop": true,
-    "allowSyntheticDefaultImports": true,
+    "module": "CommonJS"
-    "strict": true,
+  },
-    "forceConsistentCasingInFileNames": true,
+  "include": ["*.ts"]
-    "moduleResolution": "node",
-    "resolveJsonModule": true,
-    "isolatedModules": true,
-    "outDir": "dist"
-  }
 }