feat: Push Notifications with FCM function

kotlin/starter/.gitignore

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node/push-notification-with-fcm/.gitignore

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node/push-notification-with-fcm/.prettierrc.json

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+{
+  "trailingComma": "es5",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": true
+}

node/push-notification-with-fcm/README.md

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+# 🔔 Node.js Push Notifications with FCM Function
+
+Send push notifications to your users using Firebase Cloud Messaging (FCM).
+
+## 🧰 Usage
+
+### `POST`
+
+Send a push notification to a user.
+
+**Parameters**
+
+| Name         | Description                          | Location | Type               | Sample Value   |
+| ------------ | ------------------------------------ | -------- | ------------------ | -------------- |
+| Content-Type | The content type of the request body | Header   | `application/json` | N/A            |
+| deviceToken  | FCM device identifier                | Body     | String             | `642...7cd`    |
+| message      | Message to send                      | Body     | String             | `Hello World!` |
+
+**Response**
+
+Sample `200` Response:
+
+```json
+{
+    "ok": true,
+    "messageId": "as4jg109cbe1"
+}
+```
+
+Sample `400` Response:
+
+```json
+{
+    "ok": false,
+    "error": "Device token and message are required."
+}
+```
+
+Sample `500` Response:
+
+```json
+{
+    "ok": false,
+    "error": "Failed to send the message."
+}
+```
+
+## ⚙️ Configuration
+
+| Setting           | Value         |
+| ----------------- | ------------- |
+| Runtime           | Node (18.0)   |
+| Entrypoint        | `src/main.js` |
+| Build Commands    | `npm install` |
+| Permissions       | `any`         |
+| Timeout (Seconds) | 15            |
+
+## 🔒 Environment Variables
+
+### FCM_PROJECT_ID
+
+A unique identifier for your FCM project.
+
+| Question      | Answer                                                                                             |
+| ------------- | -------------------------------------------------------------------------------------------------- |
+| Required      | Yes                                                                                                |
+| Sample Value  | `mywebapp-f6e57`                                                                                   |
+| Documentation | [FCM: Project ID](https://firebase.google.com/docs/projects/learn-more#project-id)                 |
+
+### FCM_CLIENT_EMAIL
+
+Your FCM service account email.
+
+| Question      | Answer                                                                                             |
+| ------------- | -------------------------------------------------------------------------------------------------- |
+| Required      | Yes                                                                                                |
+| Sample Value  | `[email protected]`                                            |
+| Documentation | [FCM: SDK Setup](https://firebase.google.com/docs/admin/setup#initialize_the_sdk_in_non-google_environments) |
+
+### FCM_PRIVATE_KEY
+
+A unique private key used to authenticate with FCM.
+
+| Question      | Answer                                                                                             |
+| ------------- | -------------------------------------------------------------------------------------------------- |
+| Required      | Yes                                                                                                |
+| Sample Value | `0b6830cc66d92804e11af2153242d34211d675675`                                                         |
+| Documentation | [FCM: SDK Setup](https://firebase.google.com/docs/admin/setup#initialize_the_sdk_in_non-google_environments) |
+
+### FCM_DATABASE_URL
+
+URL of your FCM database.
+
+| Question      | Answer                                                                                             |
+| ------------- | -------------------------------------------------------------------------------------------------- |
+| Required      | Yes                                                                                                |
+| Sample Value | `https://my-app-e398e.firebaseio.com`                                                               |
+| Documentation | [FCM: SDK Setup](https://firebase.google.com/docs/admin/setup#initialize_the_sdk_in_non-google_environments) |

node/push-notification-with-fcm/env.d.ts

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+declare global {
+  namespace NodeJS {
+    interface ProcessEnv {
+      FCM_PROJECT_ID: string;
+      FCM_CLIENT_EMAIL: string;
+      FCM_PRIVATE_KEY: string;
+      FCM_DATABASE_URL: string;
+    }
+  }
+}
+
+export {};