Remove duplicate .com strings

Author: horgh

CHANGELOG.md

@@ -14,6 +14,9 @@
   their local part when `hash_address` is used. For example,
   `[email protected]` will become `[email protected]` for additional
   `yahoo.com` domains.
+* Duplicate `.com`s are now removed from email domain names when
+  `hash_address` is used. For example, `example.com.com` will become
+  `example.com`.
 
 ## v2.4.0 (2024-01-12)
 

lib/minfraud/components/email.rb

@@ -326,6 +326,8 @@ def clean_domain(domain)
 
         domain = SimpleIDN.to_ascii(domain)
 
+        domain.sub!(/(?:\.com){2,}$/, '.com')
+
         if TYPO_DOMAINS.key?(domain)
           domain = TYPO_DOMAINS[domain]
         end

spec/components/email_spec.rb

@@ -75,6 +75,7 @@
         { input: '[email protected]', output: '[email protected]' },
         { input: '[email protected]', output: '[email protected]' },
         { input: '[email protected]', output: '[email protected]' },
+        { input: '[email protected]', output: '[email protected]' },
       ]
 
       tests.each do |i|