require "rails/application_controller" class Rails::MailersController < Rails::ApplicationController # :nodoc: prepend_view_path ActionDispatch::DebugExceptions::RESCUES_TEMPLATE_PATH before_action :require_local!, unless: :show_previews? before_action :find_preview, only: :preview def index @previews = ActionMailer::Preview.all @page_title = "Mailer Previews" end def preview if params[:path] == @preview.preview_name @page_title = "Mailer Previews for #{@preview.preview_name}" render action: "mailer" else @email_action = File.basename(params[:path]) if @preview.email_exists?(@email_action) @email = @preview.call(@email_action) if params[:part] part_type = Mime::Type.lookup(params[:part]) if part = find_part(part_type) response.content_type = part_type render plain: part.respond_to?(:decoded) ? part.decoded : part else raise AbstractController::ActionNotFound, "Email part '#{part_type}' not found in #{@preview.name}##{@email_action}" end else @part = find_preferred_part(request.format, Mime[:html], Mime[:text]) render action: "email", layout: false, formats: %w[html] end else raise AbstractController::ActionNotFound, "Email '#{@email_action}' not found in #{@preview.name}" end end end protected def show_previews? ActionMailer::Base.show_previews end def find_preview candidates = [] params[:path].to_s.scan(%r{/|$}) { candidates << $` } preview = candidates.detect { |candidate| ActionMailer::Preview.exists?(candidate) } if preview @preview = ActionMailer::Preview.find(preview) else raise AbstractController::ActionNotFound, "Mailer preview '#{params[:path]}' not found" end end def find_preferred_part(*formats) formats.each do |format| if part = @email.find_first_mime_type(format) return part end end if formats.any? { |f| @email.mime_type == f } @email end end def find_part(format) if part = @email.find_first_mime_type(format) part elsif @email.mime_type == format @email end end end