feat: add connect relay server

.changeset/README.md

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+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/config@3.0.0/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.dockerignore

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+**/node_modules/
+**/.git
+**/README.md
+**/LICENSE
+**/.vscode
+**/npm-debug.log
+**/coverage
+**/.env
+**/.editorconfig
+**/.aws
+**/.github
+**/build
+**/.husky
+**/dist
+**/Dockerfile*

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**What is the bug?**
+A concise, high level description of the bug and how it affects you
+
+**How can it be reproduced? (optional)**
+Include steps, code samples, replits, screenshots and anything else that would be helpful to reproduce the problem. 
+
+**Additional context (optional)**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature
+about: "Opening new feature requests "
+title: "feat: "
+labels: ""
+assignees: ""
+---
+
+**What is the feature you would like to implement?**
+A concise, high level summary of the feature
+
+**Why is this feature important?**
+An argument for why this feature should be build and how it should be prioritized
+
+**How should this feature be built? (optional)**
+A design for the implementation of the feature
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+## Motivation
+
+Describe why this issue should be fixed and link to any relevant design docs, issues or other relevant items.
+
+## Change Summary
+
+Describe the changes being made in 1-2 concise sentences.
+
+## Merge Checklist
+
+_Choose all relevant options below by adding an `x` now or at any time before submitting for review_
+
+- [ ] PR title adheres to the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) standard
+- [ ] PR has a changeset
+- [ ] PR has been tagged with a change label(s) (i.e. documentation, feature, bugfix, or chore)
+- [ ] PR includes documentation if necessary
+- [ ] All commits have been signed
+
+## Additional Context
+
+If this is a relatively large or complex change, provide more details here that will help reviewers

.github/workflows/ci.yml

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+name: CI
+on:
+  # CI is run on main because new branches can only access caches from master, not previous branches.
+  # So building on master allows new PR's to get the cache from before.
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+# prevent multiple simultaneous test runs
+concurrency:
+  group: "${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}"
+  cancel-in-progress: true
+
+jobs:
+  analyze:
+    timeout-minutes: 10
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3
+        with:
+          node-version: "20"
+
+      - name: Restore cached dependencies for Node modules.
+        id: module-cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ github.workspace }}/node_modules
+          key: ${{ runner.os }}--node--${{ hashFiles('**/yarn.lock') }}
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Run build
+        run: yarn build
+
+      - name: Run linter
+        run: yarn lint:ci
+
+  test:
+    timeout-minutes: 10
+    runs-on: "buildjet-4vcpu-ubuntu-2204"
+
+    strategy:
+      matrix:
+        node_version: [18, 20]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node_version }}
+
+      - name: Restore cached dependencies for Node modules.
+        id: module-cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ github.workspace }}/node_modules
+          key: ${{ runner.os }}--node--${{ matrix.node_version}}--${{ hashFiles('**/yarn.lock') }}
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Run build
+        run: yarn build
+
+      - name: Start background services
+        shell: bash
+        run: docker compose -f ./apps/relay/docker-compose.yml up --build --detach redis
+
+      - name: Run tests
+        run: yarn test:ci
+
+      - name: Upload coverage results
+        uses: codecov/codecov-action@v3

.github/workflows/label_issues.yml

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+name: Label Issues
+
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  label_issues:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Add label
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            github.rest.issues.addLabels({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ['s-triage']
+            })

.gitignore

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+# Logs
+yarn-debug.log*
+yarn-error.log*
+
+.DS_Store
+**/.DS_Store
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+build
+.history
+.hub_history
+
+# Dependency directories
+node_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Environment variables
+.env
+
+.eslintcache
+depot.json
+
+.console-history
+
+# Code Coverage Reports
+coverage/
+
+# Turborepo
+.turbo
+out
+
+dist
+
+# Editor Cache
+.vscode
+.idea
+.fleet
+**/.vitepress/cache/
+**/.vitepress/dist/

.husky/pre-commit

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+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+yarn lint-staged

.yarnrc

@@ -0,0 +1 @@
+registry: https://registry.npmjs.org/

apps/relay/.gitignore

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+.env

apps/relay/biome.json

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+{
+  "$schema": "../../node_modules/@biomejs/biome/configuration_schema.json",
+  "organizeImports": {
+    "enabled": false
+  },
+  "formatter": {
+    "enabled": true,
+    "indentSize": 2,
+    "indentStyle": "space",
+    "lineWidth": 120
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "complexity": {
+        "useLiteralKeys": "off"
+      }
+    }
+  }
+}

apps/relay/docker-compose.yml

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+version: "3.9"
+
+services:
+  redis:
+    image: "redis:7.2-alpine"
+    restart: unless-stopped
+    command: --save 1 1 --loglevel warning --maxmemory-policy noeviction
+    volumes:
+      - redis-data:/data
+    ports:
+      - "6379:6379"
+    healthcheck:
+      test: ["CMD-SHELL", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 10s
+      retries: 3
+      start_period: 5s
+
+volumes:
+  redis-data:

apps/relay/fastify.d.ts

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+import { FastifyRequest as DefaultFastifyRequest } from "fastify";
+import { RelaySession } from "./src/handlers";
+import { ChannelStore } from "./src/channels";
+
+declare module "fastify" {
+  export interface FastifyRequest extends DefaultFastifyRequest {
+    channelToken: string;
+    channels: ChannelStore<RelaySession>;
+  }
+}

apps/relay/jest.config.ts

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+import type { Config } from "jest";
+
+const jestConfig: Config = {
+  testEnvironment: "node",
+  coveragePathIgnorePatterns: ["<rootDir>/build/", "<rootDir>/node_modules/"],
+  testPathIgnorePatterns: ["<rootDir>/build", "<rootDir>/node_modules"],
+  extensionsToTreatAsEsm: [".ts"],
+  moduleNameMapper: {
+    "^(\\.{1,2}/.*)\\.js$": "$1",
+  },
+  /**
+   * For high performance with minimal configuration transform with TS with swc.
+   * @see https://github.com/farcasterxyz/hub/issues/314
+   */
+  transform: {
+    "^.+\\.(t|j)sx?$": "@swc/jest",
+  },
+  maxWorkers: "50%",
+};
+
+export default jestConfig;

apps/relay/package.json

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+{
+  "name": "@farcaster/connect-relay",
+  "version": "0.0.1",
+  "description": "Farcaster Connect relay server",
+  "private": true,
+  "type": "commonjs",
+  "scripts": {
+    "build": "tsc --project ./tsconfig.json",
+    "lint": "biome format src/ --write && biome check src/ --apply",
+    "lint:ci": "biome ci src/",
+    "test": "yarn build && jest",
+    "test:ci": "yarn build && ENVIRONMENT=test NODE_OPTIONS=\"--experimental-vm-modules --max-old-space-size=4096\" jest --ci --forceExit --coverage",
+    "start": "yarn build && node build/app.js start"
+  },
+  "engines": {
+    "node": ">=18"
+  },
+  "dependencies": {
+    "@farcaster/hub-nodejs": "^0.10.19",
+    "@fastify/cors": "^8.4.2",
+    "dotenv": "^16.3.1",
+    "ethers": "^6.9.0",
+    "fastify": "^4.24.3",
+    "ioredis": "^5.3.2",
+    "neverthrow": "^6.1.0",
+    "siwe": "^2.1.4"
+  },
+  "devDependencies": {
+    "axios": "^1.6.2",
+    "jest": "^29.7.0"
+  }
+}

apps/relay/src/app.ts

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+import { RelayServer } from "./server";
+import { CHANNEL_TTL, REDIS_URL, RELAY_SERVER_HOST, RELAY_SERVER_PORT } from "./env";
+
+new RelayServer({
+  redisUrl: REDIS_URL,
+  ttl: CHANNEL_TTL,
+  corsOrigin: "*",
+}).start(RELAY_SERVER_HOST, RELAY_SERVER_PORT);