slack-github-action/index.js

const core = require('@actions/core');
const github = require('@actions/github');
const { WebClient } = require('@slack/web-api');
const flatten = require('flat');
const axios = require('axios');

try {
    const botToken = process.env.SLACK_BOT_TOKEN;
    const webhookUrl = process.env.SLACK_WEBHOOK_URL;

    console.log('botToken', botToken, typeof botToken)
    console.log('webhookUrl', webhookUrl, typeof webhookUrl)


    let payload = core.getInput('payload');
    console.log('payload:')
    console.log(payload)
    console.log(typeof payload, payload.length)

    if (payload.length < 1) {
        console.log('undefined payload');
        console.log('no payload passed in, using payload that triggered the GitHub Action')
        // Get the JSON webhook payload for the event that triggered the workflow
        payload = github.context.payload;
    } else {
        console.log('in else')
        try {
            // confirm it is valid json
            payload = JSON.parse(payload);
            console.log('vaid json')
        } catch (e) {
            // passed in payload wasn't valid json
            console.error("passed in payload was invalid")
            throw 'Need to provide valid json payload'
        }
    }

    // console.log(`The event payload: ${JSON.stringify(payload, undefined, 2)}`);

    if (botToken === undefined && webhookUrl === undefined) {
        throw 'Need to provide at least one botToken or webhookUrl'
    }

    if (botToken.length > 0) {
        const message = core.getInput('slack-message');
        const channelId = core.getInput('channel-id');
        console.log('message', message, typeof message)
        console.log('channelId', channelId, typeof channelId)

        const web = new WebClient(botToken);

        if(channelId.length > 0 && message.length > 0) {
            // post message
            web.chat.postMessage({text: message, channel: channelId});
        } else {
            console.log('missing either channel-id or slack-message! Did not send a message via chat.postMessage with botToken');
        }
    } 
    
    console.log('webhookURL type', typeof webhookUrl)
    if (webhookUrl !== undefined && webhookUrl.length > 0) {
        console.log('flattening');
        // send flat payload to webhookUrl
        const flatPayload = flatten(payload);

        // workflow builder requires values to be strings
        // iterate over every value and convert it to string
        Object.keys(flatPayload).forEach((key) => {
            flatPayload[key] = '' + flatPayload[key];
        })

        console.log('flattened Payload');
        console.log(flatPayload);

        console.log('sending webhook')
        axios.post(webhookUrl, flatPayload)
    }

    const time = (new Date()).toTimeString();
    core.setOutput("time", time);

    } catch (error) {
    core.setFailed(error.message);
}