Archive Slack channels with no messages in the last three months.

slack-cleanup.js

// Archive channels with no new messages in the last two months.
// Usage: npm install slack async
// SLACK_TOKEN=XYZ node slack-cleanup.js
// Get your Slack Token: https://api.slack.com/docs/oauth-test-tokens
"use strict"

const readline = require('readline')
const slack = require('slack')
const async = require('async')

const token = process.env.SLACK_TOKEN

// 2 months
const oldest = ((new Date(Date.now() - (1000 * 60 * 60 * 24 * 30 * 2))).valueOf() / 1000)

const max = 16


const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
})


slack.channels.list({token}, (err, data) => {
    if (err) throw err

    let toArchive = []
    async.eachLimit(data.channels.filter((c) => !c.is_archived), max, (channel, callback) => {
        // Has there been a message in the channel since `oldest`?
        let options = {
            token,
            channel: channel.id,
            oldest,
            count: 1
        }

        slack.channels.history(options, (err, data) => {
            if (err) return callback(err)
            if (!data.messages.length) toArchive.push(channel)
            return callback(null)
        })
    }, (err) => {
        if (err) throw err

        let confirm = `Found ${toArchive.length} channels with no messages:\n\n`
                      + toArchive.map(c => c.name).sort().join('\n')
                      + "\n\nType 'Yes' to archive the channels: "

        rl.question(confirm, (answer) => {
            rl.close()
            if (answer.toLowerCase() != 'yes') return

            async.eachLimit(toArchive, max, (channel, callback) => {
                let options = {token, channel: channel.id}

                slack.channels.archive(options, (err, data) => {
                    // You can get a bunch of errors here ...
                    // https://api.slack.com/methods/channels.archive
                    // Most of them probably don't matter.
                    if (err) console.error(`🚫  ${channel.name} ${err}`)
                    return callback(null)
                })
            }, (err) => {
                if (err) throw err
                console.log(`👉  Done!`)
            })
        })
    })
})