Slack

A simple wrapper for handling interactive Slack HTTP requests.

Currently, only slash command and interactive message (button & menu) requests are supported.

Documentation can be found at https://hexdocs.pm/slack_interactive.

Installation

The package can be installed by adding slack with reference to hex: :slack_interactive to your list of dependencies in mix.exs:

def deps do
  [{:slack, "~> 0.1.1", hex: :slack_interactive}]
end

With Phoenix Controllers

Use Slack.Phoenix.ActionController in your Phoenix controllers with your validation token provided by Slack. Valid Slack requests will be forwarded to handle_action or handle_command respective to the request type.

defmodule App.SlackController do
  use Slack.Phoenix.ActionController, token: "SLACK_TOKEN"

  import Plug.Conn

  def handle_action(action, conn, slack) do
    conn
    |> put_status(200)
    |> text("Working on this action")
  end

  def handle_command(command, conn, slack) do
    conn
    |> put_status(200)
    |> text("Working on this command")
  end
end

Handling Requests

Define a route in your Phoenix router with the :dispatch action to validate incoming requests and dispatch to the overridable functions handle_action or handle_command.

defmodule App.Router do
  use Phoenix.Router

  post "/slack/*path", App.SlackController, :dispatch
end

If an incoming request contains a matching validation token, either handle_action or handle_command will be called. Override these functions in your controller to manipulate the validated Slack data and respond to the request. The following arugments are passed to these functions:

• action or command: Either the action map or command string from the request.
• conn: The incoming request as a Plug.Conn.
• slack: The incoming request parameters converted to a Slack struct.

A Plug.Conn is expected as the return value for these functions.

Slack Argument

The third argument passed to the handle functions contains the below fields. The default value of these fields is nil if the incoming request did not contain a matching field name.

• action - map with :name and :value for action request (action request only)
• command - slash command string (command request only)
• text - the text string following the slash command (command request only)
• team - map with :domain and :id for Slack team
• channel - map with :name and :id for Slack channel
• user - map with :name and :id for Slack user
• token - validation token used to confirm request came from Slack
• reponse_url - string containing URL for delayed response to request

Action request only fields (defaults to nil for command requests):

• callback_id - string of callback_id from message attachment
• action_ts - string timestamp when action occurred
• message_ts - string timestamp when message containing action was posted
• attachment_id - string id for specific attachment within message
• original_message - original message JSON object

See Slack docs for responding to button and menu actions and slash commands

Changelog

[0.1.1] - 2017-16-05

• Added Interactive Menu Message support