discourse/app/services/notification_emailer.rb

# frozen_string_literal: true

class NotificationEmailer
  class EmailUser
    attr_reader :notification, :no_delay

    def initialize(notification, no_delay: false)
      @notification = notification
      @no_delay = no_delay
    end

    def group_mentioned
      enqueue :group_mentioned
    end

    def mentioned
      enqueue :user_mentioned
    end

    def posted
      enqueue :user_posted
    end

    def watching_category_or_tag
      enqueue :user_posted
    end

    def quoted
      enqueue :user_quoted
    end

    def replied
      enqueue :user_replied
    end

    def linked
      enqueue :user_linked
    end

    def watching_first_post
      enqueue :user_watching_first_post
    end

    def post_approved
      enqueue :post_approved
    end

    def private_message
      enqueue_private(:user_private_message)
    end

    def invited_to_private_message
      enqueue(:user_invited_to_private_message, private_delay)
    end

    def invited_to_topic
      enqueue(:user_invited_to_topic, private_delay)
    end

    def self.notification_params(notification, type)
      post_id = (notification.data_hash[:original_post_id] || notification.post_id).to_i
      notification_type = Notification.types[notification.notification_type]

      hash = {
        type: type.to_s,
        user_id: notification.user_id,
        notification_id: notification.id,
        notification_data_hash: notification.data_hash,
        notification_type: notification_type.to_s,
      }

      hash[:post_id] = post_id if post_id > 0 && notification_type != :post_approved
      hash
    end

    private

    EMAILABLE_POST_TYPES = Set.new [Post.types[:regular], Post.types[:whisper]]

    def enqueue(type, delay = default_delay)
      return if notification.user.user_option.email_level == UserOption.email_level_types[:never]
      perform_enqueue(type, delay)
    end

    def enqueue_private(type, delay = private_delay)
      if notification.user.user_option.nil?
        # this can happen if we roll back user creation really early
        # or delete user
        # bypass this pm
        return
      end

      if notification.user.user_option.email_messages_level == UserOption.email_level_types[:never]
        return
      end
      perform_enqueue(type, delay)
    end

    def perform_enqueue(type, delay)
      user = notification.user
      return unless user.active? || user.staged?
      return if SiteSetting.must_approve_users? && !user.approved? && !user.staged?
      if user.staged? &&
           (
             type == :user_linked || type == :user_quoted || type == :user_mentioned ||
               type == :group_mentioned
           )
        return
      end

      return if EMAILABLE_POST_TYPES.exclude?(post_type)

      Jobs.enqueue_in(delay, :user_email, self.class.notification_params(notification, type))
    end

    def default_delay
      no_delay ? 0 : SiteSetting.email_time_window_mins.minutes
    end

    def private_delay
      no_delay ? 0 : SiteSetting.personal_email_time_window_seconds
    end

    def post_type
      @post_type ||=
        begin
          type = notification.data_hash["original_post_type"] if notification.data_hash
          type ||= notification.post.try(:post_type)
          type
        end
    end
  end

  def self.disable
    @disabled = true
  end

  def self.enable
    @disabled = false
  end

  def self.process_notification(notification, no_delay: false)
    return if @disabled

    email_user = EmailUser.new(notification, no_delay: no_delay)
    email_method = Notification.types[notification.notification_type]

    if DiscoursePluginRegistry.email_notification_filters.any? { |filter|
         !filter.call(notification)
       }
      return
    end

    email_user.public_send(email_method) if email_user.respond_to? email_method
  end
end