discourse-custom-wizard/lib/custom_wizard/validators/template.rb

# frozen_string_literal: true
class CustomWizard::TemplateValidator
  include HasErrors
  include ActiveModel::Model

  def initialize(data, opts = {})
    @data = data
    @opts = opts
    @subscription = CustomWizard::Subscription.new
  end

  def perform
    data = @data

    check_id(data, :wizard)
    check_required(data, :wizard)
    validate_after_signup
    validate_after_time
    validate_subscription(data, :wizard)

    return false if errors.any?

    data[:steps].each do |step|
      check_required(step, :step)
      validate_subscription(step, :step)
      validate_liquid_template(step, :step)

      if step[:fields].present?
        step[:fields].each do |field|
          validate_subscription(field, :field)
          check_required(field, :field)
          validate_liquid_template(field, :field)
        end
      end
    end

    if data[:actions].present?
      data[:actions].each do |action|
        validate_subscription(action, :action)
        check_required(action, :action)
        validate_liquid_template(action, :action)
      end
    end

    !errors.any?
  end

  def self.required
    {
      wizard: ['id', 'name', 'steps'],
      step: ['id'],
      field: ['id', 'type'],
      action: ['id', 'type']
    }
  end

  def self.subscription
    {
      wizard: {
        save_submissions: 'false',
        restart_on_revisit: 'true',
      },
      step: {
        condition: 'present',
        index: 'conditional',
        required_data: 'present',
        permitted_params: 'present'
      },
      field: {
        condition: 'present',
        index: 'conditional'
      },
      action: {
        type: %w[
          send_message
          add_to_group
          create_category
          create_group
          send_to_api
        ]
      }
    }
  end

  private

  def check_required(object, type)
    self.class.required[type].each do |property|
      if object[property].blank?
        errors.add :base, I18n.t("wizard.validation.required", property: property)
      end
    end
  end

  def validate_subscription(object, type)
    self.class.subscription[type].each do |property, subscription_type|
      val = object[property.to_s]
      is_subscription = (val != nil) && (
        subscription_type === 'present' && val.present? ||
        (['true', 'false'].include?(subscription_type) && cast_bool(val) == cast_bool(subscription_type)) ||
        (subscription_type === 'conditional' && val.is_a?(Hash)) ||
        (subscription_type.is_a?(Array) && subscription_type.include?(val))
      )

      if is_subscription && !@subscription.subscribed?
        errors.add :base, I18n.t("wizard.validation.subscription", type: type.to_s, property: property)
      end
    end
  end

  def check_id(object, type)
    if type === :wizard && @opts[:create] && CustomWizard::Template.exists?(object[:id])
      errors.add :base, I18n.t("wizard.validation.conflict", wizard_id: object[:id])
    end
  end

  def validate_after_signup
    return unless ActiveRecord::Type::Boolean.new.cast(@data[:after_signup])

    other_after_signup = CustomWizard::Template.list(setting: 'after_signup')
      .select { |template| template['id'] != @data[:id] }

    if other_after_signup.any?
      errors.add :base, I18n.t("wizard.validation.after_signup", wizard_id: other_after_signup.first['id'])
    end
  end

  def validate_after_time
    return unless ActiveRecord::Type::Boolean.new.cast(@data[:after_time])

    if ActiveRecord::Type::Boolean.new.cast(@data[:after_signup])
      errors.add :base, I18n.t("wizard.validation.after_signup_after_time")
      return
    end

    wizard = CustomWizard::Wizard.create(@data[:id]) if !@opts[:create]
    current_time = wizard.present? ? wizard.after_time_scheduled : nil
    new_time = @data[:after_time_scheduled]

    begin
      active_time = Time.parse(new_time.present? ? new_time : current_time).utc
    rescue ArgumentError
      invalid_time = true
    end

    if invalid_time || active_time.blank? || active_time < Time.now.utc
      errors.add :base, I18n.t("wizard.validation.after_time")
    end
  end

  def cast_bool(val)
    ActiveRecord::Type::Boolean.new.cast(val)
  end

  def validate_liquid_template(object, type)
    %w[
      description
      raw_description
      placeholder
      preview_template
      post_template
    ].each do |field|
      if template = object[field]
        result = is_liquid_template_valid?(template)

        unless "valid" == result
          error = I18n.t("wizard.validation.liquid_syntax_error",
            attribute: "#{object[:id]}.#{field}",
            message: result
          )
          errors.add :base, error
        end
      end
    end
  end

  def is_liquid_template_valid?(template)
    begin
      Liquid::Template.parse(template)
      'valid'
    rescue Liquid::SyntaxError => error
      error.message
    end
  end
end