review(pr): some enhancement, tx @colinux

Co-Authored-By: Colin Darie <colin@darie.eu>

app/controllers/email_checker_controller.rb

@@ -1,5 +1,5 @@
 class EmailCheckerController < ApplicationController
   def show
-    render json: EmailChecker.check(email: params[:email])
+    render json: EmailChecker.new.check(email: params[:email])
   end
 end

app/javascript/controllers/email_input_controller.ts

@@ -21,7 +21,11 @@ export class EmailInputController extends ApplicationController {
   declare readonly inputTarget: HTMLInputElement;
 
   async checkEmail() {
-    if (!this.inputTarget.value) {
+    if (
+      !this.inputTarget.value ||
+      this.inputTarget.value.length < 5 ||
+      !this.inputTarget.value.includes('@')
+    ) {
       return;
     }
 

app/lib/email_checker.rb

@@ -1,4 +1,7 @@
 class EmailChecker
+  # Extracted 100 most used domain on our users table [june 2024]
+  # + all .gouv.fr domain on our users table
+  # + all .ac-xxx on our users table
   KNOWN_DOMAINS = [
     'gmail.com',
     'hotmail.fr',
@@ -612,10 +615,10 @@ class EmailChecker
     'ac-toulous.fr'
   ].freeze
 
-  def self.check(email:)
+  def check(email:)
     return { success: false } if email.blank?
 
-    parsed_email = Mail::Address.new(email)
+    parsed_email = Mail::Address.new(EmailSanitizableConcern::EmailSanitizer.sanitize(email))
     return { success: false } if parsed_email.domain.blank?
 
     return { success: true } if KNOWN_DOMAINS.any? { _1 == parsed_email.domain }
@@ -628,22 +631,22 @@ class EmailChecker
 
   private
 
-  def self.closest_domains(domain:)
+  def closest_domains(domain:)
     KNOWN_DOMAINS.filter do |known_domain|
       close_by_distance_of(domain, known_domain, distance: 1) ||
       with_same_chars_and_close_by_distance_of(domain, known_domain, distance: 2)
     end
   end
 
-  def self.close_by_distance_of(a, b, distance:)
+  def close_by_distance_of(a, b, distance:)
     String::Similarity.levenshtein_distance(a, b) == distance
   end
 
-  def self.with_same_chars_and_close_by_distance_of(a, b, distance:)
+  def with_same_chars_and_close_by_distance_of(a, b, distance:)
     close_by_distance_of(a, b, distance: 2) && a.chars.sort == b.chars.sort
   end
 
-  def self.email_suggestions(parsed_email:, similar_domains:)
+  def email_suggestions(parsed_email:, similar_domains:)
     similar_domains.map { Mail::Address.new("#{parsed_email.local}@#{_1}").to_s }
   end
 end

spec/lib/email_checker_spec.rb

@@ -1,6 +1,6 @@
 describe EmailChecker do
   describe 'check' do
-    subject { described_class }
+    subject { described_class.new }
 
     it 'works with identified use cases' do
       expect(subject.check(email: nil)).to eq({ success: false })