Add client for ZPL preview generation service [SCI-7049]

Gemfile

@@ -89,6 +89,7 @@ gem 'underscore-rails'
 gem 'wicked_pdf'
 gem 'wkhtmltopdf-heroku', '2.12.5'
 
+gem 'aws-sdk-lambda'
 gem 'aws-sdk-rails'
 gem 'aws-sdk-s3'
 gem 'delayed_job_active_record'

Gemfile.lock

@@ -137,6 +137,9 @@ GEM
     aws-sdk-kms (1.41.0)
       aws-sdk-core (~> 3, >= 3.109.0)
       aws-sigv4 (~> 1.1)
+    aws-sdk-lambda (1.57.0)
+      aws-sdk-core (~> 3, >= 3.109.0)
+      aws-sigv4 (~> 1.1)
     aws-sdk-rails (3.6.0)
       aws-record (~> 2)
       aws-sdk-ses (~> 1)
@@ -634,6 +637,7 @@ DEPENDENCIES
   auto_strip_attributes (~> 2.1)
   autosize-rails
   awesome_print
+  aws-sdk-lambda
   aws-sdk-rails
   aws-sdk-s3
   base62

app/controllers/label_templates_controller.rb

@@ -4,10 +4,10 @@ class LabelTemplatesController < ApplicationController
   include InputSanitizeHelper
 
   before_action :check_feature_enabled
-  before_action :check_view_permissions, only: %i(index datatable)
+  before_action :check_view_permissions, except: %i(create duplicate set_default delete update)
   before_action :check_manage_permissions, only: %i(create duplicate set_default delete update)
   before_action :load_label_templates, only: %i(index datatable)
-  before_action :load_label_template, only: %i(show set_default update)
+  before_action :load_label_template, only: %i(show set_default update zpl_preview)
 
   layout 'fluid'
 
@@ -89,6 +89,17 @@ class LabelTemplatesController < ApplicationController
     render json: LabelTemplates::TagService.new(current_team).tags
   end
 
+  def zpl_preview
+    service = LabelTemplatesPreviewService.new(@label_template.content, current_user, {})
+    payload = service.generate_zpl_preview!
+
+    if service.error.blank?
+      render json: { base64_preview: payload.string }
+    else
+      render json: { error: I18n.t('errors.general') }, status: :unprocessable_entity
+    end
+  end
+
   private
 
   def check_feature_enabled

app/services/label_templates_preview_service.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class LabelTemplatesPreviewService
+  extend Service
+
+  attr_reader :error, :preview
+
+  def initialize(zpl, user, params)
+    @zpl = zpl
+    @user = user
+    @params = params
+  end
+
+  def generate_zpl_preview!
+    client = Aws::Lambda::Client.new(region: ENV['AWS_REGION'])
+    resp = client.invoke(
+      function_name: 'BinaryKitsZplViewer',
+      invocation_type: 'RequestResponse',
+      log_type: 'Tail',
+      payload: "{ \"content\": #{@zpl.to_json} }"
+    )
+
+    if resp.function_error.nil?
+      @preview = resp.payload
+    else
+      @error = resp.function_error
+    end
+  end
+end