Invite a Slack user to every non archived channels and groups

invite_slack_user_everywhere.rb

require "slack-ruby-client"

token = ...
user_name = ...

Slack.configure do |config|
  config.token = token
end

client = Slack::Web::Client.new
client.auth_test

user_id = client.users_list.members.find { |m| m.name == user_name }.id

channels = client.channels_list(exclude_archived: true).channels
channels_without_user = channels.select { |c| !c.members.include?(user_id) }
channels_without_user.each do |c|
  client.channels_invite({ channel: c.id, user: user_id })
end

groups = client.groups_list(exclude_archived: true).groups
groups = groups.select{|g| g.is_mpim == false }
groups_without_user = groups.select { |g| !g.members.include?(user_id) }

groups_without_user.each do |g|
  client.groups_invite({ channel: g.id, user: user_id })
end