Build a Slack ChatGPT Bot with JavaScript, including full source code, free hosting, and step-by-step tutorial.

1// Import dependencies from AirCode.io, including database and file storage methods
2const aircode = require('aircode');
3
4// Import axios for making http requests
5const axios = require('axios');
6
7// Import the OpenAI SDK
8const openai = require("openai");
9
10// Import the Slack SDK, related documentation https://slack.dev/node-slack-sdk/
11const { WebClient } = require('@slack/web-api');
12
13// Get the Slack bot Token from environment variables
14const slackBotToken = process.env.SlackBotToken;
15if (!slackBotToken) return { error: 'Please configure the Slack bot Token according to the tutorial.' };
16const slackClient = new WebClient(slackBotToken);
17
18// Get the OpenAI Secret from environment variables
19const OpenAISecret = process.env.OpenAISecret;
20let chatGPT = null;
21if (OpenAISecret) {
22  const configuration = new openai.Configuration({ apiKey: OpenAISecret });
23  const client = new openai.OpenAIApi(configuration);
24
25  // Method to chat with ChatGTP, pass in a string
26  chatGPT = async (content) => {
27    return await client.createChatCompletion({
28      // Use the latest 3.5 model currently available from OpenAI, if GPT4 is released later, modify this parameter
29      // OpenAI models parameter list https://platform.openai.com/docs/models
30      model: 'gpt-3.5-turbo',
31      // Set the role of ChatGPT as an assistant
32      messages: [{ role: 'assistant', content }],
33    });
34  };
35}
36
37// Entry function for the Slack ChatGPT bot
38module.exports = async function(params, context) {
39
40  // All parameters for calling the current function can be obtained directly from params
41  // For Slack event request validation, it is required to return directly when there is a challenge parameter
42  if (params.challenge) return { challenge: params.challenge };
43  
44  // Slack bot will have a client_msg_id for every user message
45  const msgId = params.event.client_msg_id;
46
47  // You can easily write data to the database using the database
48  // Instantiate a table called contents
49  const contentsTable = aircode.db.table('contents');
50  
51  // Search the contents table for an entry with a msgId that matches the current one
52  const contentObj = await contentsTable.where({ msgId }).findOne();
53
54  // If contentObj has a value, it means this event has occurred before
55  // Since the response time of ChatGPT is relatively long, this situation may be Slack retrying, return directly to prevent repeated calls
56  // This does not take effect when the current environment is in DEBUG mode, which is convenient for debugging
57  if (contentObj && context.trigger !== 'DEBUG') return;
58  
59  // Get the content of the message sent by the user to the bot, remove the at character part
60  const message = params.event.text.replace(/<@.*?>\s*/,'');
61
62  // Get the information of the person who sent the message
63  const senderId = params.event.user;
64
65  // The message to be returned to the user
66  let replyContent = '';
67
68  // Determine if there are other types of files (e.g., images), as ChatGPT currently only supports text content
69  if (!params.event.files) {
70
71    // By default, the content sent by the user is returned to the user, which is just a bot that directly returns the conversation
72    replyContent = message;    
73
74    // Store the message body information in the database for subsequent query history or context support
75    await contentsTable.save({ msgId, senderId, message });
76
77    // If the OpenAI Key is configured, let ChatGPT reply
78    if (OpenAISecret) {
79
80      // Send the user's specific message to ChatGPT
81			try {
82	      const result = await chatGPT(message);	
83
84	      // Send the ChatGPT reply obtained to the user
85	      replyContent = `${result.data.choices[0].message.content.trim()}`;    
86			} catch (err) {
87				err = err.toJSON();
88				if (err.status === 429) return {
89					error: 'You encounter a OpenAI ChatGPT 429 situation, need to go to OpenAI and pay for more quotas. ChatGPT Plus is only for web-based payments, the API is another channel that requires payment per token.' };
90				return err.message;
91			}
92    }
93
94  } else {
95    replyContent = 'Sorry, we currently do not support other types of files.';
96  }
97  
98  // Send the processed message to the user via the Slack bot
99  await slackClient.chat.postMessage({
100    channel: params.event.channel,
101    text: `<@${senderId}> ${replyContent}`,
102    thread_ts: params.event.ts,
103    reply_broadcast: true,
104  });
105
106  // The entire function call is complete and needs to return
107  return null;
108};
109
110