add email 2FA

lib/text_utils.rb

@@ -24,7 +24,7 @@ module TextUtils
     text.to_s.gsub(TRANSLITERATION_REGEXP) { |e| TRANSLITERATIONS[e] }
   end
 
-  def mask_value(text, unmask_size = 0)
+  def mask_value(text, unmask_size = 0, mask_symbol = MASK_SYMBOL)
     if unmask_size.is_a?(Numeric) && !unmask_size.zero? && unmask_size.abs < text.length
       if unmask_size.negative?
         [
@@ -34,14 +34,34 @@ module TextUtils
       elsif unmask_size.positive?
         [
           text.first(unmask_size),
-          text.last(text.length - unmask_size).gsub(MASK_REGEXP, MASK_SYMBOL)
+          text.last(text.length - unmask_size).gsub(MASK_REGEXP, mask_symbol)
         ].join
       end
     else
-      text.to_s.gsub(MASK_REGEXP, MASK_SYMBOL)
+      text.to_s.gsub(MASK_REGEXP, mask_symbol)
     end
   end
 
+  def mask_email(email, unmask_size = 2)
+    return email if email.exclude?('@')
+
+    local, domain = email.split('@', 2)
+
+    return email if local.blank? || domain.blank?
+
+    masked_local = mask_value(local, unmask_size, '*')
+    domain_parts = domain.split('.')
+
+    if domain_parts.blank? || domain_parts[0].blank?
+      masked_domain = mask_value(domain, 1, '*')
+    else
+      domain_parts[0] = mask_value(domain_parts[0], 1, '*')
+      masked_domain = domain_parts.join('.')
+    end
+
+    "#{masked_local}@#{masked_domain}"
+  end
+
   def maybe_rtl_reverse(text)
     if text.match?(RTL_REGEXP)
       TwitterCldr::Shared::Bidi