module Slack::Web::Faraday::Connection

def connection
  options = {
    headers: { 'Accept' => 'application/json; charset=utf-8' }
  }
  options[:headers]['User-Agent'] = user_agent if user_agent
  options[:proxy] = proxy if proxy
  options[:ssl] = { ca_path: ca_path, ca_file: ca_file } if ca_path || ca_file
  request_options = {}
  request_options[:timeout] = timeout if timeout
  request_options[:open_timeout] = open_timeout if open_timeout
  options[:request] = request_options if request_options.any?
  ::Faraday::Connection.new(endpoint, options) do |connection|
    connection.use ::Faraday::Request::Multipart
    connection.use ::Faraday::Request::UrlEncoded
    connection.use ::Faraday::Response::RaiseError
    connection.use ::Slack::Web::Faraday::Response::RaiseError
    connection.use ::FaradayMiddleware::Mashify, mash_class: Slack::Messages::Message
    connection.use ::FaradayMiddleware::ParseJson
    connection.response :logger, logger if logger
    connection.adapter ::Faraday.default_adapter
  end
end