commands: add chat command to chat with ChatGPT

package.json

@@ -40,6 +40,7 @@
         "jsdom": "^22.1.0",
         "libsodium-wrappers": "^0.7.13",
         "mathjs": "^12.1.0",
+        "openai": "^4.20.1",
         "play-dl": "^1.9.7",
         "r6api.js": "^4.4.1",
         "undici": "^5.27.2",

settings.example.yaml

@@ -79,6 +79,16 @@ auth: ""
 coinMarketCapApiKey: ""
 # Required for `apod` command.
 nasaApiKey: "DEMO_KEY"
+# Required for `chat` command to use the OpenAI's ChatGPT APIs.
+# API pricing depends on these values.
+# For more details, check https://openai.com/pricing
+openai:
+  apiKey: ""
+  # If you want to use GPT-4, set `model` to `gpt-4`.
+  model: "gpt-3.5-turbo"
+  # Change the `maxTokens` value to set the length of ChatGPT's responses.
+  # https://platform.openai.com/tokenizer
+  maxTokens: 100
 # Required for `weather` command.
 openWeatherMapApiKey: ""
 # Required for `movie` and `tv` commands.

src/commands/chat.ts

@@ -0,0 +1,55 @@
+/*!
+ * @author TRACTION (iamtraction)
+ * @copyright 2023
+ */
+import { ApplicationCommandOptionType, ChatInputCommandInteraction } from "discord.js";
+import { Client, Command } from "@bastion/tesseract";
+import OpenAI from "openai";
+
+import Settings from "../utils/settings.js";
+
+class ChatCommand extends Command {
+    constructor() {
+        super({
+            name: "chat",
+            description: "Ask questions or chat with ChatGPT from OpenAI.",
+            owner: true,
+            options: [
+                {
+                    type: ApplicationCommandOptionType.String,
+                    name: "message",
+                    description: "Your message.",
+                    required: true,
+                },
+            ],
+        });
+    }
+
+    public async exec(interaction: ChatInputCommandInteraction<"cached">): Promise<void> {
+        await interaction.deferReply();
+
+        const message = interaction.options.getString("message");
+
+        const openai = new OpenAI({
+            apiKey: ((interaction.client as Client).settings as Settings).get("openai").apiKey,
+        });
+
+        const response = await openai.chat.completions.create({
+            model: ((interaction.client as Client).settings as Settings).get("openai").model || "gpt-3.5-turbo",
+            messages: [
+                {
+                    role: "user",
+                    content: message,
+                },
+            ],
+            max_tokens: ((interaction.client as Client).settings as Settings).get("openai").maxTokens || 100,
+            user: interaction.member.id,
+        });
+
+        await interaction.editReply({
+            content: response.choices[0].message.content,
+        });
+    }
+}
+
+export { ChatCommand as Command };

src/types.ts

@@ -12,6 +12,11 @@ export namespace bastion {
         auth?: string;
         coinMarketCapApiKey?: string;
         nasaApiKey?: string;
+        openai?: {
+            apiKey?: string;
+            model?: string;
+            maxTokens?: number;
+        };
         openWeatherMapApiKey?: string;
         tmdbApiKey?: string;
         trackerNetworkApiKey?: string;