gem 'slack-ruby-bot-server-events'

SlackRubyBotServer.configure do |config|
  config.oauth_version = :v2
  config.oauth_scope = ['users:read', 'channels:read', 'groups:read', 'chat:write', 'commands', 'incoming-webhook']
end

SlackRubyBotServer::Events.configure do |config|
  config.signing_secret = 'secret'
end

SlackRubyBotServer::Events.configure do |config|
  config.on :event, 'event_callback', 'link_shared' do |event|
    event[:event][:links].each do |link|
      Slack::Web::Client.new(token: ...).chat_unfurl(
        channel: event[:event][:channel],
        ts: event[:event][:message_ts],
        unfurls: {
          link[:url] => { text: 'Unfurled URL.' }
        }.to_json
      )
    end

    true # return true to avoid invoking further callbacks
  end

  config.on :event, 'event_callback' do |event|
    # handle any event callback
    false
  end

  config.on :event do |event|
    # handle any event[:event][:type]
    false
  end
end

SlackRubyBotServer::Events.configure do |config|
  config.on :action, 'interactive_message', 'action_id' do |action|
    payload = action[:payload]
    message = payload[:message]

    Faraday.post(payload[:response_url], {
      text: "The text \"#{message[:text]}\" has #{message[:text].size} letter(s).",
      response_type: 'ephemeral'
    }.to_json, 'Content-Type' => 'application/json')

    { ok: true }
  end

  config.on :action do |action|
    # handle any other action
    false
  end
end

SlackRubyBotServer::Events.configure do |config|
  config.on :action, 'block_actions', 'your_action_id' do |action|
    payload = action[:payload]

    Faraday.post(payload[:response_url], {
      text: "The action \"your_action_id\" has been invoked.",
      response_type: 'ephemeral'
    }.to_json, 'Content-Type' => 'application/json')

    { ok: true }
  end
end

SlackRubyBotServer::Events.configure do |config|
  config.on :command, '/ping' do
    { text: 'pong' }
  end

  config.on :command do |command|
    # handle any other command
    false
  end
end