Merge commit 'a485f97d21c3fb7da927e8fd239b301a590ee9b8' into glitch-soc/merge-upstream

app/models/concerns/canonical_email.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module CanonicalEmail
+  extend ActiveSupport::Concern
+
+  included do
+    normalizes :email, with: ->(value) { canonicalize_email(value) }
+  end
+
+  class_methods do
+    def canonicalize_email(email)
+      email
+        .downcase
+        .split('@', 2)
+        .then { |local, domain| [canonical_username(local), domain] }
+        .join('@')
+    end
+
+    def canonical_username(username)
+      username
+        .to_s
+        .delete('.')
+        .split('+', 2)
+        .first
+    end
+  end
+end