workers-site: bring back redirekt

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

.gitignore

@@ -1,6 +1,8 @@
 public/
 resources/
 dist/
-msfjarvis-dev/
-msfjarvis-dev-staging/
+node_modules/
+transpiled/
+worker/
+package-lock.json
 wrangler.toml

package.json

@@ -0,0 +1,25 @@
+{
+  "name": "redirekt",
+  "version": "1.0.0",
+  "description": "Cloudflare Worker to do simple redirects to GitHub",
+  "main": "index.js",
+  "scripts": {
+    "build": "webpack",
+    "dev": "NODE_ENV=development npm run build",
+    "format": "prettier --write '**/*.{ts,js,css,json,md}'",
+    "transpile": "tsc --project ./test"
+  },
+  "author": "Harsh Shandilya <me@msfjarvis.dev>",
+  "license": "MIT OR Apache-2.0",
+  "devDependencies": {
+    "prettier": "^2.1.2",
+    "source-map-loader": "^1.1.2",
+    "source-map-support": "^0.5.19",
+    "ts-loader": "^8.0.11",
+    "typescript": "^4.0.5",
+    "webpack": "^4.44.2"
+  },
+  "dependencies": {
+    "@cloudflare/kv-asset-handler": "0.0.12"
+  }
+}

tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "outDir": "./dist",
+    "module": "commonjs",
+    "target": "esnext",
+    "lib": ["esnext", "webworker"],
+    "alwaysStrict": true,
+    "strict": true,
+    "preserveConstEnums": true,
+    "moduleResolution": "node",
+    "sourceMap": true,
+    "esModuleInterop": true
+  },
+  "include": ["./workers-site/src/*.ts", "./workers-site/test/*.ts", "./workers-site/src/**/*.ts", "./workers-site/test/**/*.ts"],
+  "exclude": ["node_modules/", "dist/"]
+}

webpack.config.js

@@ -0,0 +1,30 @@
+const path = require('path')
+const webpack = require('webpack')
+
+const mode = process.env.NODE_ENV || 'production'
+
+module.exports = {
+  entry: "./workers-site/src",
+  output: {
+    filename: `worker.${mode}.js`,
+    path: path.join(__dirname, 'dist'),
+  },
+  devtool: 'source-map',
+  mode,
+  resolve: {
+    extensions: ['.ts', '.tsx', '.js'],
+    plugins: [],
+  },
+  module: {
+    rules: [
+      {
+        test: /\.tsx?$/,
+        loader: 'ts-loader',
+        options: {
+          transpileOnly: true,
+        },
+      },
+      { enforce: 'pre', test: /\.js$/, loader: 'source-map-loader' },
+    ],
+  },
+}

workers-site/src/handler.ts

@@ -0,0 +1,75 @@
+import { getAssetFromKV } from '@cloudflare/kv-asset-handler';
+
+const BASE_URL = 'https://msfjarvis.dev/';
+const GITHUB_USERNAME = 'msfjarvis';
+const APS_SLUG = 'Android-Password-Store/Android-Password-Store';
+const GITHUB_URL = `https://github.com/${GITHUB_USERNAME}`;
+const APS_GITHUB_URL = `https://github.com/${APS_SLUG}`;
+
+export async function handleRequest(event: FetchEvent): Promise<Response> {
+    return redirectGitHub(event);
+}
+
+async function getPageFromKV(event: FetchEvent): Promise<Response> {
+    const options = {};
+    try {
+        const page = await getAssetFromKV(event, options);
+        const response = new Response(page.body, page);
+        response.headers.set('X-XSS-Protection', '1; mode=block');
+        response.headers.set('X-Content-Type-Options', 'nosniff');
+        response.headers.set('X-Frame-Options', 'DENY');
+        response.headers.set('Referrer-Policy', 'unsafe-url');
+        response.headers.set('Feature-Policy', 'none');
+        return response;
+    } catch (e) {
+        try {
+            let notFoundResponse = await getAssetFromKV(event, {
+                mapRequestToAsset: (req) =>
+                    new Request(`${new URL(req.url).origin}/404.html`, req),
+            });
+            return new Response(notFoundResponse.body, {
+                ...notFoundResponse,
+                status: 404,
+            });
+        } catch (e) {}
+        return new Response(e.message || e.toString(), { status: 500 });
+    }
+}
+
+async function redirectGitHub(event: FetchEvent): Promise<Response> {
+    const urlParts = event.request.url.replace(BASE_URL, '').split('/');
+    switch (urlParts[0]) {
+        case 'g':
+            switch (urlParts.length) {
+                case 1:
+                    return Response.redirect(GITHUB_URL, 301);
+                case 2:
+                    return Response.redirect(
+                        `${GITHUB_URL}/${urlParts[1]}`,
+                        301
+                    );
+                case 3:
+                    return Response.redirect(
+                        `${GITHUB_URL}/${urlParts[1]}/commit/${urlParts[2]}`,
+                        301
+                    );
+            }
+        case 'aps':
+            switch (urlParts.length) {
+                case 1:
+                    return Response.redirect(APS_GITHUB_URL, 301);
+                case 2:
+                    return Response.redirect(
+                        `${APS_GITHUB_URL}/commit/${urlParts[1]}`,
+                        301
+                    );
+                case 3:
+                    return Response.redirect(
+                        `${APS_GITHUB_URL}/issues/${urlParts[2]}`,
+                        301
+                    );
+            }
+        default:
+            return getPageFromKV(event);
+    }
+}

workers-site/src/index.ts

@@ -0,0 +1,7 @@
+import { handleRequest } from './handler'
+
+addEventListener('fetch', (event) => {
+  if (event instanceof FetchEvent) {
+    event.respondWith(handleRequest(event))
+  }
+})