once-campfire/lib/web_push/notification.rb

class WebPush::Notification
  def initialize(title:, body:, path:, badge:, endpoint:, p256dh_key:, auth_key:)
    @title, @body, @path, @badge = title, body, path, badge
    @endpoint, @p256dh_key, @auth_key = endpoint, p256dh_key, auth_key
  end

  def deliver(connection: nil)
    WebPush.payload_send \
      message: encoded_message,
      endpoint: @endpoint, p256dh: @p256dh_key, auth: @auth_key,
      vapid: vapid_identification,
      connection: connection,
      urgency: "high"
  end

  private
    def vapid_identification
      { subject: "mailto:support@37signals.com" }.merge \
        Rails.configuration.x.vapid.symbolize_keys
    end

    def encoded_message
      JSON.generate title: @title, options: { body: @body, icon: icon_path, data: { path: @path, badge: @badge } }
    end

    def icon_path
      Rails.application.routes.url_helpers.account_logo_path
    end
end