update express-sms-autoresponder to Typescript (#22)

* update express-sms-autoresponder to typescript

* add github action workflow

.github/workflows/express-sms-autoresponder.yml

@@ -0,0 +1,30 @@
+name: CI express-sms-autoresponder
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - "express-sms-autoresponder/**"
+  pull_request:
+    branches: [master]
+    paths:
+      - "express-sms-autoresponder/**"
+
+jobs:
+  type-check:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: express-sms-autoresponder
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm run type-check

express-sms-autoresponder/.eslintrc.js

@@ -0,0 +1,9 @@
+module.exports = {
+  parserOptions: {
+    ecmaVersion: 6,
+  },
+  rules: {
+    'new-cap': 'off',
+    'no-console': 'off',
+  },
+};

express-sms-autoresponder/.nvmrc

@@ -0,0 +1 @@
+20.17.0

express-sms-autoresponder/.tool-versions

@@ -0,0 +1,2 @@
+nodejs 20.17.0
+npm 10.8.1

express-sms-autoresponder/README.md

@@ -8,7 +8,6 @@ Sample application demonstrating Telnyx-Node SMS autoresponse
 
 </div>
 
-
 ## Documentation & Tutorial
 
 The full documentation and tutorial is available on [developers.telnyx.com](https://developers.telnyx.com/docs/v2/development/dev-env-setup?lang=dotnet&utm_source=referral&utm_medium=github_referral&utm_campaign=cross-site-link)
@@ -17,21 +16,22 @@ The full documentation and tutorial is available on [developers.telnyx.com](http
 
 - Complete the steps outlined on the [Messaging > Quickstarts > Portal Setup](https://developers.telnyx.com/docs/v2/messaging/quickstarts/portal-setup#mission-control-portal-set-up) developer page
 - You will:
-    - Create a Telnyx account
-    - Purchase an SMS-capable phone number with Telnyx
-    - Create a messaging profile
-    - Assign your phone number to your messaging profile
+  - Create a Telnyx account
+  - Purchase an SMS-capable phone number with Telnyx
+  - Create a messaging profile
+  - Assign your phone number to your messaging profile
 
 ## Setup Localhost App
 
 - Clone this repository and change directory to this project folder
 - Run `npm install`
 - Run `cp .env.sample .env` and record the [Telynx API Key](https://portal.telnyx.com/#/app/api-keys) in the `.env` file
-- Start the server `node index.js`
+- Start the server `npm run start`
 
 ## Setup Reverse Proxy to Localhost
 
 For your localhost app to receive webhooks from Telnyx, we recommend the use of [ngrok](https://ngrok.com/):
+
 - Sign up for a free account and follow the ngrok 'Setup & Installation' guide. When running the `ngrok` tool, be sure to change the port value from `80` to `5000` (the port our app is listening on).
 - Once the `ngrok` process is running on your localhost, copy the forwarding https address (e.g., https://4f7e5039ecb9.ngrok.io)
 - On your [Telnyx Messaging Profile](https://portal.telnyx.com/#/app/messaging), update the Inbound Settings to "Send a webhook to this URL" with the copied forwarding url and append the defined webhooks path (e.g., https://4f7e5039ecb9.ngrok.io/webhooks)

express-sms-autoresponder/index.ts

@@ -0,0 +1,55 @@
+import "dotenv/config";
+import Telnyx from "telnyx";
+import express from "express";
+
+const telnyx = new Telnyx(String(process.env.TELNYX_API_KEY || ""));
+const app = express();
+const port = 5000;
+
+app.use(express.json());
+
+const preparedReplies = new Map([
+  ["pizza", "Chicago pizza is the best"],
+  ["ice cream", "I prefer gelato"],
+]);
+const defaultReply =
+  "Please send either the word 'pizza' or 'ice cream' for a different response";
+
+const processWebhook = (webhookBody: Telnyx.events.InboundMessageEvent) => {
+  const eventType = webhookBody.data?.event_type;
+  const payload = webhookBody.data?.payload;
+  const direction = payload?.direction;
+
+  if (eventType === "message.received" && direction === "inbound" && payload) {
+    const smsMessage = payload.text?.replace(/\s+/g, " ").trim().toLowerCase();
+    const replyToTN = payload.from?.phone_number!;
+    const telnyxSMSNumber = payload.to?.at(0)?.phone_number;
+    const preparedReply = preparedReplies.get(smsMessage!) || defaultReply;
+
+    return telnyx.messages.create({
+      from: telnyxSMSNumber,
+      to: replyToTN,
+      text: preparedReply,
+      use_profile_webhooks: false,
+      auto_detect: false,
+    });
+  }
+};
+
+app.post("/webhooks", async (req, res) => {
+  try {
+    console.log(req.body);
+    const result = await processWebhook(req.body);
+    console.log(result);
+  } catch (e) {
+    console.log(e);
+  } finally {
+    res.status(200).end();
+  }
+});
+
+app.listen(port, () => {
+  console.log(
+    `Telnyx SMS autoresponder quickstart app is listening at http://localhost:${port}`
+  );
+});