Initial commit

src/config_example.json

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+{
+  "__comment": "Don't forget to rename the file to config.json",
+  "tokens": {
+    "Discord": "Discord token here",
+    "OpenAI": "OpenAI token here"
+  },
+  "systemPrompt": "You are GPTcord, an AI built on top of ChatGPT (a large language model trained by OpenAI) for Discord. Answer as concisely as possible."
+}

src/index.ts

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+import DiscordApi from "discord.js";
+import { Configuration as OpenAIApiConfiguration, OpenAIApi } from "openai";
+
+import config from "./config.json";
+import toOpenAIMessages from "./toOpenAIMessages";
+
+const discord = new DiscordApi.Client({
+  intents: [
+    DiscordApi.GatewayIntentBits.Guilds,
+    DiscordApi.GatewayIntentBits.GuildMessages,
+    DiscordApi.GatewayIntentBits.MessageContent,
+  ]
+});
+
+const openai = new OpenAIApi(new OpenAIApiConfiguration({
+  apiKey: config.tokens.OpenAI
+}));
+
+discord.on("ready", async event => {
+  console.log(`Connected to Discord as ${event.user.tag} (${event.user.id})`);
+});
+
+discord.on("messageCreate", async message => {
+  if (message.author.bot) return;
+  if (!message.mentions.has(message.client.user)) return;
+
+  try {
+    let messages: DiscordApi.Collection<string, DiscordApi.Message> = await message.channel.messages.fetch({ limit: 50, cache: false });
+
+    messages = messages.filter(m => message.createdTimestamp - m.createdTimestamp < 1000*60*60 );
+
+    message.channel.sendTyping();
+    const answer = await openai.createChatCompletion({
+      model: "gpt-3.5-turbo",
+      messages: toOpenAIMessages(messages),
+      max_tokens: 168
+    });
+
+    message.reply({
+      content: answer.data.choices[0].message?.content,
+      allowedMentions: {
+        repliedUser: false,
+      }
+    });
+
+    const usage = answer.data.usage;
+    if (usage != undefined) {
+      const channelName: string = message.inGuild() ? `${message.channel.name} (${message.guild.name})` : `@${message.author.tag}`;
+      console.log(`Used ${usage.total_tokens} (${usage.prompt_tokens} + ${usage.completion_tokens}) tokens for ${message.author.tag} (${message.author.id}) in #${channelName}`);
+    }
+  } catch (e) {
+    console.error(e);
+
+    message.reply({
+      embeds: [{
+        color: 0xff0000,
+        description: "Something bad happened! :frown:"
+      }],
+      allowedMentions: {
+        repliedUser: false,
+      }
+    });
+  }
+});
+
+discord.login(config.tokens.Discord);

src/toOpenAIMessages.ts

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+import { ChatCompletionRequestMessage as OpenAIMessage } from "openai";
+import { Collection, Message as DiscordMessage } from "discord.js";
+
+import config from "./config.json";
+
+function formatMessage(message: DiscordMessage): string {
+  let rvalue: string = message.cleanContent;
+
+  for (const attachment of message.attachments) {
+    rvalue += ` [Attachment: ${attachment[1].name}`;
+    rvalue += attachment[1].description ? ` - ${attachment[1].description}` : "";
+    rvalue += "]";
+  }
+
+  for (const embed of message.embeds) {
+    rvalue += ` [Embed:`;
+    rvalue += embed.title                 ? ` ${embed.title}` : "";
+    rvalue += embed.author                ? ` by ${embed.author}` : "";
+    rvalue += embed.title || embed.author ? " -": "";
+    rvalue += embed.description           ? ` ${embed.description}` : "";
+    rvalue += "]";
+  }
+
+  return rvalue;
+}
+
+export default function toOpenAIMessages(messages: Collection<string, DiscordMessage>): OpenAIMessage[] {
+  const rvalue: OpenAIMessage[] = [];
+
+  rvalue.push({ role: "system", content: config.systemPrompt});
+
+  messages
+  .sort((a, b) => a.createdTimestamp - b.createdTimestamp)
+  .each(message => {
+    rvalue.push({
+      role: message.author.id == message.client.user.id ? "assistant" : "user",
+      content: formatMessage(message),
+      name: message.member?.displayName,
+    });
+  });
+
+  return rvalue;
+}