pundit: convert emails to pundit.

app/models/email_address.rb

@@ -12,4 +12,18 @@ class EmailAddress < ApplicationRecord
     self.normalized_address = EmailNormalizer.normalize(value) || address
     super
   end
+
+  concerning :VerificationMethods do
+    def verifier
+      @verifier ||= Danbooru::MessageVerifier.new(:email_verification_key)
+    end
+
+    def verification_key
+      verifier.generate(id)
+    end
+
+    def valid_key?(key)
+      id == verifier.verified(key)
+    end
+  end
 end