discourse-custom-wizard/controllers/transfer.rb

class CustomWizard::TransferController < ::ApplicationController
  before_action :ensure_logged_in
  before_action :ensure_admin
  skip_before_action :check_xhr, :only => [:export]

  def index
  end

  def export
    wizards = params['wizards']
    wizard_objects = []
    if wizards.nil?
      render json: {error: 'Please select atleast one wizard'}
      return
    end

    wizards.each do |w|
      wizard_objects.push(PluginStore.get('custom_wizard', w.tr('-', '_')))
    end

    send_data wizard_objects.to_json, type: "application/json", disposition: 'attachment', filename: 'wizards.json'

  end

  def is_json(string)
    begin
      !!JSON.parse(string)
    rescue
      false
    end
  end

  def import
    file = File.read(params['file'].tempfile)
    if file.nil?
      render json: {error: "No file selected"}
      return
    end
    fileSize = file.size
    maxFileSize = 512 * 1024
    if maxFileSize < fileSize
      render json: {error: "File too large"}
    end

    unless is_json file
      render json: {error: "File is not a valid json file"}
    end

    jsonObject = JSON.parse file

    countValid = 0
    success_ids = []
    failed_ids = []
    jsonObject.each do |o|
      # validate whether the given json is a valid "wizard"
      next unless CustomWizard::Template.new(o)
      countValid += 1
      pluginStoreEntry = PluginStore.new 'custom_wizard'
      #plugin store detects the json object type and sets proper `type_name` for the entry
      # this condition helps us avoid updating an existing wizard instead of adding a new one
      saved = pluginStoreEntry.set(o['id'], o) unless pluginStoreEntry.get(o['id'])
      success_ids.push o['id'] if !!saved
      failed_ids.push o['id'] if !saved
    end

    if countValid == 0
      render json: {error: "File doesn't contain any valid wizards"}
    else
      render json: {success: success_ids, failed: failed_ids}
    end
  end


end