Translates letter

epics.gemspec

@@ -41,6 +41,7 @@ Gem::Specification.new do |spec|
   spec.post_install_message += "\e[32m" + ('*' * 60) + "\n\e[0m"
 
   spec.add_dependency 'faraday',  '>= 1.10.0'
+  spec.add_dependency 'i18n',     '>= 1.1.0'
   spec.add_dependency 'nokogiri', '>= 1.16.5'
   spec.add_dependency 'rubyzip',  '>= 2.3.2'
   spec.add_dependency 'rexml',    '>= 3.2.8'

lib/epics.rb

@@ -1,6 +1,7 @@
 require 'openssl'
 require 'base64'
 require 'erb'
+require 'i18n'
 require 'json'
 require 'zlib'
 require 'zip'
@@ -12,6 +13,7 @@
 require "epics/key"
 require "epics/response"
 require "epics/error"
+require 'epics/letter_renderer'
 require "epics/middleware/xmlsig"
 require "epics/middleware/parse_ebics"
 require "epics/generic_request"
@@ -52,6 +54,8 @@
 require "epics/signer"
 require "epics/client"
 
+I18n.load_path += Dir[File.join(File.dirname(__FILE__), 'letter/locales', '*.yml')]
+
 module Epics
 
 end

lib/epics/client.rb

@@ -3,6 +3,7 @@ class Epics::Client
 
   attr_accessor :passphrase, :url, :host_id, :user_id, :partner_id, :keys, :keys_content
   attr_writer :iban, :bic, :name
+  attr_accessor :locale
 
   def_delegators :connection, :post
 
@@ -14,6 +15,7 @@ def initialize(keys_content, passphrase, url, host_id, user_id, partner_id)
     self.host_id    = host_id
     self.user_id    = user_id
     self.partner_id = partner_id
+    self.locale = :de
   end
 
   def inspect
@@ -68,9 +70,12 @@ def self.setup(passphrase, url, host_id, user_id, partner_id, keysize = 2048)
     client
   end
 
+  def letter_renderer
+    @letter_renderer ||= Epics::LetterRenderer.new(self)
+  end
+
   def ini_letter(bankname)
-    raw = File.read(File.join(File.dirname(__FILE__), '../letter/', 'ini.erb'))
-    ERB.new(raw).result(binding)
+    letter_renderer.render(bankname)
   end
 
   def save_ini_letter(bankname, path)

lib/epics/letter_renderer.rb

@@ -0,0 +1,22 @@
+class Epics::LetterRenderer
+  extend Forwardable
+
+  TEMPLATE_PATH = File.join(File.dirname(__FILE__), '../letter/', 'ini.erb')
+  I18N_SCOPE = 'epics.letter'
+
+  def initialize(client)
+    @client = client
+  end
+
+  def translate(key, **options)
+    I18n.translate(key, **{ locale: @client.locale, scope: I18N_SCOPE }.merge(options))
+  end
+
+  alias_method :t, :translate
+
+  def_delegators :@client, :host_id, :user_id, :partner_id, :a, :x, :e
+
+  def render(bankname)
+    ERB.new(File.read(TEMPLATE_PATH)).result(binding)
+  end
+end