Merge pull request #7 from appwrite/feat-discord-command-bot

feat: Discord Command Bot function

node/discord-command-bot/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
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+pids
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+
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+
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+.env
+.env.development.local
+.env.test.local
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+.pnp.*

node/discord-command-bot/.prettierrc.json

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

node/discord-command-bot/README.md

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+# 🤖 Node.js Discord Command Bot Function
+
+Simple command using Discord Interactions.
+
+## 🧰 Usage
+
+### `POST`
+
+Webhook to receive Discord command events. To receive events, you must register your application as a [Discord bot](https://discord.com/developers/applications).
+
+**Parameters**
+
+| Name                  | Description                      | Location | Type   | Sample Value    |
+| --------------------- | -------------------------------- | -------- | ------ | --------------- |
+| x-signature-ed25519   | Signature of the request payload | Header   | string | `d1efb...aec35` |
+| x-signature-timestamp | Timestamp of the request payload | Header   | string | `1629837700`    |
+
+**Response**
+
+Sample `200` Response:
+
+Returns a Discord message object.
+
+```json
+{
+  "type": 4,
+  "data": {
+    "content": "Hello from Appwrite 👋"
+  }
+}
+```
+
+Sample `401` Response:
+
+```json
+{
+  "error": "Invalid request signature"
+}
+```
+
+## ⚙️ Configuration
+
+| Setting           | Value         |
+| ----------------- | ------------- |
+| Runtime           | Node (18.0)   |
+| Entrypoint        | `src/main.js` |
+| Build Commands    | `npm install` |
+| Permissions       | `any`         |
+| Timeout (Seconds) | 15            |
+
+## 🔒 Environment Variables
+
+### DISCORD_PUBLIC_KEY
+
+Discord Public Key to verify request signature.
+
+| Question      | Answer                                                                                                                 |
+| ------------- | ---------------------------------------------------------------------------------------------------------------------- |
+| Required      | Yes                                                                                                                    |
+| Sample Value  | `d1efb...aec35`                                                                                                        |
+| Documentation | [Discord Docs](https://discord.com/developers/docs/tutorials/hosting-on-cloudflare-workers#creating-an-app-on-discord) |

node/discord-command-bot/env.d.ts

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+declare global {
+  namespace NodeJS {
+    interface ProcessEnv {
+      DISCORD_PUBLIC_KEY: string;
+    }
+  }
+}
+
+export {};

node/discord-command-bot/package.json

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+{
+  "name": "discord-bot",
+  "version": "1.0.0",
+  "description": "",
+  "main": "src/main.js",
+  "type": "module",
+  "scripts": {
+    "format": "prettier --write ."
+  },
+  "dependencies": {
+    "discord-interactions": "^3.4.0"
+  },
+  "devDependencies": {
+    "prettier": "^3.0.0"
+  }
+}

node/discord-command-bot/src/main.js

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+import { InteractionResponseType, InteractionType } from 'discord-interactions';
+import { throwIfMissing } from './utils.js';
+
+export default async ({ req, res, error }) => {
+  throwIfMissing(process.env, ['DISCORD_PUBLIC_KEY']);
+
+  const verified = await verifyKey(
+    req.bodyRaw,
+    req.headers['x-signature-ed25519'],
+    req.headers['x-signature-timestamp'],
+    process.env.DISCORD_PUBLIC_KEY
+  );
+
+  if (!verified) {
+    error('Invalid request.');
+    return res.json({ error: 'Invalid request signature' }, 401);
+  }
+
+  const interaction = req.body;
+  if (
+    interaction.type === InteractionType.APPLICATION_COMMAND &&
+    interaction.data.name === 'hello'
+  ) {
+    return res.json({
+      type: InteractionResponseType.CHANNEL_MESSAGE_WITH_SOURCE,
+      data: {
+        content: 'Hello from Appwrite 👋',
+      },
+    });
+  }
+
+  return res.json({ type: InteractionResponseType.PONG });
+};

node/discord-command-bot/src/utils.js

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+/**
+ * Throws an error if any of the keys are missing from the object
+ * @param {*} obj
+ * @param {string[]} keys
+ * @throws {Error}
+ */
+export function throwIfMissing(obj, keys) {
+  const missing = [];
+  for (let key of keys) {
+    if (!(key in obj) || !obj[key]) {
+      missing.push(key);
+    }
+  }
+  if (missing.length > 0) {
+    throw new Error(`Missing required fields: ${missing.join(', ')}`);
+  }
+}