Slack Ruby Bot Server Events Extension

An extension to slack-ruby-bot-server that makes it easy to handle Slack slash commands, interactive buttons and events.

Table of Contents

• Sample
• Usage
  • Gemfile
  • Configure
    • OAuth
    • Events
  • Implement Callbacks
  • Events
  • Actions
  • Commands
• Copyright & License

Sample

See slack-ruby/slack-ruby-bot-server-events-sample for a working sample.

Usage

Gemfile

Add 'slack-ruby-bot-server-events' to Gemfile.

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

Configure

OAuth

Configure your app's OAuth version and scopes as needed by your application.

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

Events

Configure events-specific settings.

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

The following settings are supported.

setting	description
signing_secret	Slack signing secret, defaults is ENV['SLACK_SIGNING_SECRET'].
signature_expires_in	Signature expiration window in seconds, default is 300.

Get the signing secret from your app's Basic Information settings.

Implement Callbacks

This library supports events, actions and commands. When implementing multiple callbacks for each type, the response from the first callback to return a non nil value will be used and no further callbacks will be invoked. Callbacks receive subclasses of SlackRubyBotServer::Events::Requests::Request.

Events

Respond to Slack Events by implementing SlackRubyBotServer::Events::Config#on :event.

The following example unfurls URLs.

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

Actions

Respond to Shortcuts and Interactive Messages as well as Attached Interactive Message Buttons(Outmoded) by implementing SlackRubyBotServer::Events::Config#on :action.

The following example posts an ephemeral message that counts the letters in a message shortcut.

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

The following example responds to an interactive message.
You can compose rich message layouts using Block Kit Builder.

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

Commands

Respond to Slash Commands by implementing SlackRubyBotServer::Events::Config#on :command.

The following example responds to /ping with pong.

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

Copyright & License

Copyright Daniel Doubrovkine and Contributors, 2020

MIT License