debian-mirror-gitlab/app/controllers/sent_notifications_controller.rb

class SentNotificationsController < ApplicationController
  skip_before_action :authenticate_user!

  def unsubscribe
    @sent_notification = SentNotification.for(params[:id])

    return render_404 unless @sent_notification && @sent_notification.unsubscribable?
    return unsubscribe_and_redirect if current_user || params[:force]
  end

  private

  def unsubscribe_and_redirect
    noteable = @sent_notification.noteable
    noteable.unsubscribe(@sent_notification.recipient, @sent_notification.project)

    flash[:notice] = "You have been unsubscribed from this thread."

    if current_user
      redirect_to noteable_path(noteable)
    else
      redirect_to new_user_session_path
    end
  end

  def noteable_path(noteable)
    case noteable
    when Issue
      issue_path(noteable)
    when MergeRequest
      merge_request_path(noteable)
    else
      root_path
    end
  end
end