Initial commit

.eslintrc.yml

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+env:
+  es2020: true
+  worker: true
+extends: ["plugin:@typescript-eslint/recommended"]
+parser: "@typescript-eslint/parser"
+parserOptions:
+  ecmaVersion: 2020
+  ecmaFeatures:
+    impliedStrict: true
+  sourceType: module
+root: true
+rules:
+  indent: [error, 2, { SwitchCase: 1 }]
+  semi: [error, always]
+  quotes: [error, single, avoid-escape]
+  no-trailing-spaces: [error]
+  no-unused-vars: [error, { argsIgnorePattern: ^_ }]
+  prefer-const: [error, { destructuring: all }]

.github/workflows/deploy-master-to-prod.yml

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+name: Deploy master into production on push
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: wrangler publish
+        uses: cloudflare/wrangler-action@1.3.0
+        with:
+          apiToken: ${{ secrets.CF_API_TOKEN }}
+          environment: prod
+        env:
+          CF_ACCOUNT_ID: ${{ secrets.CF_ACCOUNT_ID }}
+
+# TODO: Add organicmaps deploy.

.gitignore

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+dist/
+# Autogenerated by esbuild.
+workers-site/index.js
+node_modules/

.nvmrc

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+v14.17.0

.prettierrc

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+{
+  "printWidth": 120,
+  "tabWidth": 2,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "arrowParens": "always"
+}

LICENSE

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+Copyright 2021 Alexander Borsuk <me@alex.bio>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# Metaserver to monitor map nodes and serve them to clients
+
+[![Deploy master to Production](https://deploy.workers.cloudflare.com/button)](https://deploy.workers.cloudflare.com/?url=https://github.com/organicmaps/meta)
+
+## Requirements
+
+Install CloudFlare's wrangler and other dev dependencies using npm:
+
+```bash
+npm i
+```
+
+## Development
+
+Use `npx wrangler dev` for localhost development.
+
+## Preview on workers.dev
+
+Use `npx wrangler preview` to open and test deployed worker in browser.
+
+## Deployment
+
+All pushes to master automatically deploy dev version to https://meta.omaps.workers.dev/
+
+Deploy to prod manually using `npx wrangler publish --env prod` or this
+[action](https://github.com/organicmaps/meta/actions/workflows/deploy-master-to-prod.yml).
+
+## Known issues
+
+- Cloudflare's free Flexible SSL certificates does not support 4-th level
+  subdomains like a.b.example.com, so you can see strange SSL errors.
+- HTTPS `fetch` requests from Workers are converted to HTTP ones if the target
+  host is in the same Cloudflare zone, see [here](https://community.cloudflare.com/t/does-cloudflare-worker-allow-secure-https-connection-to-fetch-even-on-flexible-ssl/68051/12)
+  for more details.

metadata.json

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+{ "version": 1 }

package.json

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+{
+  "private": true,
+  "name": "metaserver",
+  "version": "1.0.0",
+  "description": "Returns a list of actual servers to download data",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "esbuild src/index.ts --bundle --outfile=dist/index.js",
+    "test": "eslint src/**/*.ts && tsc --noEmit",
+    "format": "prettier --write 'src/**/*.{ts,tsx,json}'"
+  },
+  "author": "Alexander Borsuk <me@alex.bio>",
+  "license": "MIT",
+  "devDependencies": {
+    "@cloudflare/workers-types": "^2.2.2",
+    "@cloudflare/wrangler": "^1.16.1",
+    "@typescript-eslint/eslint-plugin": "^4.24.0",
+    "@typescript-eslint/parser": "^4.24.0",
+    "esbuild": "^0.12.1",
+    "eslint": "^7.26.0",
+    "prettier": "^2.3.0",
+    "typescript": "^4.2.4"
+  }
+}

src/bindings.d.ts

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+export {};
+
+// Defined in wrangler.toml
+declare global {
+  const DEBUG: boolean;
+}

src/index.ts

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+export {};
+
+const SERVERS = ['https://cdn.organicmaps.app/'];
+
+addEventListener('fetch', (event) => {
+  event.respondWith(handleRequest(event.request).catch((err) => new Response(err.stack, { status: 500 })));
+});
+
+async function handleRequest(request: Request) {
+  const { pathname } = new URL(request.url);
+
+  switch (pathname) {
+    case '/servers':
+      return new Response(JSON.stringify(SERVERS), {
+        headers: { 'Content-Type': 'application/json' },
+      });
+  }
+  return new Response('', { status: 404 });
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "isolatedModules": true,
+    "outDir": "./dist",
+    "module": "ES6",
+    "moduleResolution": "node",
+    "target": "ESNext",
+    "lib": [
+      "ESNext",
+      "webworker"
+    ],
+    "alwaysStrict": true,
+    "strict": true,
+    "preserveConstEnums": true,
+    "sourceMap": true,
+    "esModuleInterop": true,
+    "types": [
+      "@cloudflare/workers-types"
+    ]
+  },
+  "include": [
+    "src/",
+  ],
+  "exclude": [
+    "node_modules/",
+    "dist/",
+  ]
+}

wrangler.toml

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+# Default worker is for dev only.
+# See omaps and organicmaps environments below for production.
+name = 'meta-dev'
+type = 'javascript'
+# Organic Maps CF Account ID.
+account_id = '462f578f0939f041e2c24ec99adce458'
+workers_dev = true
+
+[build]
+upload.format = 'service-worker'
+command = 'npm i --prefer-offline --no-audit && npm run build'
+
+[vars]
+DEBUG = true
+
+
+[env.prod]
+name = 'meta'
+workers_dev = false
+# omaps.app CF zone ID.
+zone_id = '3fce06554abc3899504e11d928be0ee7'
+# See the full list of handled paths in the code.
+route = 'meta.omaps.app/*'
+
+[env.prod.vars]
+DEBUG = false