Initial commit

.env.sample

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+APP_ID="11"
+PRIVATE_KEY_PATH="very/secure/location/gh_app_key.pem"
+WEBHOOK_SECRET="secret"

.gitignore

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+# Logs
+logs
+.env
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

app.js

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+import dotenv from "dotenv";
+import fs from "fs";
+import http from "http";
+import { App } from "octokit";
+import { createNodeMiddleware } from "@octokit/webhooks";
+
+// Load environment variables from .env file
+dotenv.config();
+
+// Set configured values
+const appId = process.env.APP_ID;
+const privateKeyPath = process.env.PRIVATE_KEY_PATH;
+const privateKey = fs.readFileSync(privateKeyPath, "utf8");
+const secret = process.env.WEBHOOK_SECRET;
+const messageForNewPRs = fs.readFileSync("./message.md", "utf8");
+
+// Create an authenticated Octokit client authenticated as a GitHub App
+const app = new App({ appId, privateKey, webhooks: { secret }});
+
+// Optional: Get & log the authenticated app's name
+const { data } = await app.octokit.request("/app");
+
+// Read more about custom logging: https://github.com/octokit/core.js#logging
+app.octokit.log.debug(`Authenticated as '${ data.name }'`);
+
+// Subscribe to the "pull_request.opened" webhook event
+app.webhooks.on("pull_request.opened", async ({ octokit, payload }) => {
+  console.log(`Received a pull request event for #${ payload.pull_request.number }`);
+  await octokit.rest.issues.createComment({
+    owner: payload.repository.owner.login,
+    repo: payload.repository.name,
+    issue_number: payload.pull_request.number,
+    body: messageForNewPRs,
+  });
+});
+
+// Optional: Handle errors
+app.webhooks.onError((error) => {
+  if (error.name === "AggregateError") {
+    // Log Secret verification errors
+    console.log(`Error processing request: ${ error.event }`);
+  } else {
+    console.log(error);
+  }
+});
+
+// Launch a web server to listen for GitHub webhooks
+const port = process.env.PORT || 3000;
+const path = "/api/webhook";
+const localWebhookUrl = `http://localhost:${ port }${ path }`;
+
+// See https://github.com/octokit/webhooks.js/#createnodemiddleware for all options
+const middleware = createNodeMiddleware(app.webhooks, { path });
+
+http.createServer(middleware).listen(port, () => { 
+  console.log(`Server is listening for events at: ${localWebhookUrl}`);
+  console.log('Press Ctrl + C to quit.')
+});

message.md

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+👋 Hi there!
+
+Thanks for opening a new PR. Please, consider following this [guide](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests) to make your PR easier to review.
+
+Also, check this new feature to [use markdown helpers](https://github.blog/changelog/2023-03-15-introducing-the-github-markdown-helpers-public-beta/) in your PR.