front.rb

class Front
  def initialize
    @username = Rails.application.secrets.front_login
    @password = Rails.application.secrets.front_password
  end

  def update_contact(attributes = {})
    attributes.symbolize_keys!
    attributes.reverse_merge!(
      name: nil,
      description: "",
      emails: [],
      phones: [],
      links: []
    )

    params = {
      name: attributes[:name],
      description: attributes[:description],
      fields: [],
      link: []
    }

    build_field = ->(source, handle) do
      params[:fields] << {
        source: source.to_s,
        handle: handle
      }
    end

    attributes[:emails].each { |e| build_field.call(:email, e) }
    attributes[:phones].each { |e| build_field.call(:phone, e) }

    attributes[:links].each do |link|
      params[:link] << { url: link }
    end

    request(:post, "contacts", params)
  end

private

  def request(method, endpoint, params = {})
    JSON.parse(resource(endpoint).send(method, params.to_json, content_type: :json, accept: :json))
  end

  def resource(endpoint)
    RestClient::Resource.new("https://#{@username}:#{@password}@api.frontapp.com/api/1/#{endpoint}")
  end
end