From 550c5abd6c331e03072c8fa0cd487e6105baf0ff Mon Sep 17 00:00:00 2001
From: Alex Sherman <yul.golem@gmail.com>
Date: Wed, 30 Jun 2021 14:16:50 +0500
Subject: [PATCH] Add punycode email support

---
 app/interactions/actions/email_check.rb | 13 +++++++---
 config/initializers/{xsd.rb => libs.rb} |  1 +
 lib/email_address_converter.rb          | 33 +++++++++++++++++++++++++
 lib/tasks/verify_email.rake             |  2 ++
 4 files changed, 45 insertions(+), 4 deletions(-)
 rename config/initializers/{xsd.rb => libs.rb} (60%)
 create mode 100644 lib/email_address_converter.rb

diff --git a/app/interactions/actions/email_check.rb b/app/interactions/actions/email_check.rb
index 5c664cb6e..c17831289 100644
--- a/app/interactions/actions/email_check.rb
+++ b/app/interactions/actions/email_check.rb
@@ -9,16 +9,17 @@ module Actions
     end
 
     def call
-      result = check_email
+      parsed_email = EmailAddressConverter.punycode_to_unicode(email)
+      result = check_email(parsed_email)
       save_result(result)
-      log_failure(result) unless result.success
+      result.success ? log_success : log_failure(result)
       result.success
     end
 
     private
 
-    def check_email
-      Truemail.validate(email, with: check_level).result
+    def check_email(parsed_email)
+      Truemail.validate(parsed_email, with: check_level).result
     end
 
     def save_result(result)
@@ -46,6 +47,10 @@ module Actions
       logger.info "Validation level #{check_level}, the result was #{result}"
     end
 
+    def log_success
+      logger.info "Successfully validated email #{email} for the #{log_object_id}."
+    end
+
     def log_object_id
       "#{validation_eventable.class}: #{validation_eventable.id}"
     end
diff --git a/config/initializers/xsd.rb b/config/initializers/libs.rb
similarity index 60%
rename from config/initializers/xsd.rb
rename to config/initializers/libs.rb
index 12a8af78a..c140f21ba 100644
--- a/config/initializers/xsd.rb
+++ b/config/initializers/libs.rb
@@ -1,2 +1,3 @@
 require 'application_service'
+require 'email_address_converter'
 require 'xsd/schema'
diff --git a/lib/email_address_converter.rb b/lib/email_address_converter.rb
new file mode 100644
index 000000000..e0d8c47c4
--- /dev/null
+++ b/lib/email_address_converter.rb
@@ -0,0 +1,33 @@
+module EmailAddressConverter
+  module_function
+
+  def punycode_to_unicode(email)
+    return email if domain(email) == 'not_found'
+
+    local = local(email)
+    domain = SimpleIDN.to_unicode(domain(email))
+    "#{local}@#{domain}"&.downcase
+  end
+
+  def unicode_to_punycode(email)
+    return email if domain(email) == 'not_found'
+
+    local = local(email)
+    domain = SimpleIDN.to_ascii(domain(email))
+    "#{local}@#{domain}"&.downcase
+  end
+
+  private
+
+  def domain(email)
+    Mail::Address.new(email).domain&.downcase || 'not_found'
+  rescue Mail::Field::IncompleteParseError
+    'not_found'
+  end
+
+  def local(email)
+    Mail::Address.new(email).local&.downcase || email
+  rescue Mail::Field::IncompleteParseError
+    email
+  end
+end
diff --git a/lib/tasks/verify_email.rake b/lib/tasks/verify_email.rake
index daffabf19..368cd4a55 100644
--- a/lib/tasks/verify_email.rake
+++ b/lib/tasks/verify_email.rake
@@ -20,4 +20,6 @@ namespace :verify_email do
                                                       .by_domain(args[:domain_name])
     verifications_by_domain.map { |ver| VerifyEmailsJob.perform_later(ver.id) }
   end
+
+  desc 'Starts verifying email jobs with check level and '
 end