mastodon/app/services/notify_service.rb

# frozen_string_literal: true

class NotifyService < BaseService
  def call(recipient, activity)
    @recipient    = recipient
    @activity     = activity
    @notification = Notification.new(account: @recipient, activity: @activity)

    return if blocked?

    create_notification
    send_email if email_enabled?
  rescue ActiveRecord::RecordInvalid
    return
  end

  private

  def blocked_mention?
    FeedManager.instance.filter?(:mentions, @notification.mention.status, @recipient)
  end

  def blocked_favourite?
    false
  end

  def blocked_follow?
    false
  end

  def blocked_reblog?
    false
  end

  def blocked?
    blocked   = @recipient.suspended?                                                                                             # Skip if the recipient account is suspended anyway
    blocked ||= @recipient.id == @notification.from_account.id                                                                    # Skip for interactions with self
    blocked ||= @recipient.blocking?(@notification.from_account)                                                                  # Skip for blocked accounts
    blocked ||= (@notification.from_account.silenced? && !@recipient.following?(@notification.from_account))                      # Hellban
    blocked ||= (@recipient.user.settings(:interactions).must_be_follower  && !@notification.from_account.following?(@recipient)) # Options
    blocked ||= (@recipient.user.settings(:interactions).must_be_following && !@recipient.following?(@notification.from_account)) # Options
    blocked ||= send("blocked_#{@notification.type}?")                                                                            # Type-dependent filters
    blocked
  end

  def create_notification
    @notification.save!
    FeedManager.instance.broadcast(@recipient.id, type: 'notification', message: FeedManager.instance.inline_render(@recipient, 'api/v1/notifications/show', @notification))
  end

  def send_email
    NotificationMailer.send(@notification.type, @recipient, @notification).deliver_later
  end

  def email_enabled?
    @recipient.user.settings(:notification_emails).send(@notification.type)
  end
end