clean(tech): EmailChecker, use class method, not instance

app/controllers/administrateurs/experts_procedures_controller.rb

@@ -9,17 +9,11 @@ module Administrateurs
     end
 
     def create
-      email_checker = EmailChecker.new
       emails = params['emails'].presence || [].to_json
       emails = JSON.parse(emails).map { EmailSanitizer.sanitize(_1) }
-      @maybe_typo, emails = emails.map do |email|
-          result = email_checker.check(email: email)
-          if result[:email_suggestions].present?
-            [email, result[:email_suggestions].first]
-          else
-            [email, nil]
-          end
-        end.partition { _1[1].present? }
+      @maybe_typo, emails = emails
+        .map { |email| [email, EmailChecker.check(email:)[:suggestions]&.first] }
+        .partition { _1[1].present? }
       errors = if !@maybe_typo.empty?
         ["Attention, nous pensons avoir identifié une faute de frappe dans les invitations : #{@maybe_typo.map(&:first).join(', ')}"]
       else

app/controllers/email_checker_controller.rb

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

app/javascript/controllers/email_input_controller.ts

@@ -4,7 +4,7 @@ import { ApplicationController } from './application_controller';
 
 type checkEmailResponse = {
   success: boolean;
-  email_suggestions: string[];
+  suggestions: string[];
 };
 
 export class EmailInputController extends ApplicationController {
@@ -36,8 +36,8 @@ export class EmailInputController extends ApplicationController {
       url.toString()
     ).json();
 
-    if (data && data.email_suggestions && data.email_suggestions.length > 0) {
-      this.suggestionTarget.innerHTML = data.email_suggestions[0];
+    if (data && data.suggestions && data.suggestions.length > 0) {
+      this.suggestionTarget.innerHTML = data.suggestions[0];
       show(this.ariaRegionTarget);
       this.ariaRegionTarget.setAttribute('aria-live', 'assertive');
     }

app/lib/email_checker.rb

@@ -615,7 +615,7 @@ class EmailChecker
     'ac-toulous.fr'
   ].freeze
 
-  def check(email:)
+  def self.check(email:)
     return { success: false } if email.blank?
 
     parsed_email = Mail::Address.new(EmailSanitizableConcern::EmailSanitizer.sanitize(email))
@@ -626,29 +626,29 @@ class EmailChecker
     similar_domains = closest_domains(domain: parsed_email.domain)
     return { success: true } if similar_domains.empty?
 
-    { success: true, email_suggestions: email_suggestions(parsed_email:, similar_domains:) }
+    { success: true, suggestions: suggestions(parsed_email:, similar_domains:) }
   rescue Mail::Field::IncompleteParseError
     return { success: false }
   end
 
   private
 
-  def closest_domains(domain:)
+  def self.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 close_by_distance_of(a, b, distance:)
+  def self.close_by_distance_of(a, b, distance:)
     String::Similarity.levenshtein_distance(a, b) == distance
   end
 
-  def with_same_chars_and_close_by_distance_of(a, b, distance:)
+  def self.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 email_suggestions(parsed_email:, similar_domains:)
+  def self.suggestions(parsed_email:, similar_domains:)
     similar_domains.map { Mail::Address.new("#{parsed_email.local}@#{_1}").to_s }
   end
 end

spec/controllers/email_checker_controller_spec.rb

@@ -16,7 +16,7 @@ describe EmailCheckerController, type: :controller do
       let(:params) { { email: 'martin@orane.fr' } }
       it do
         expect(response).to have_http_status(:success)
-        expect(body).to eq({ success: true, email_suggestions: ['martin@orange.fr'] })
+        expect(body).to eq({ success: true, suggestions: ['martin@orange.fr'] })
       end
     end
 

spec/lib/email_checker_spec.rb

@@ -1,6 +1,6 @@
 describe EmailChecker do
   describe 'check' do
-    subject { described_class.new }
+    subject { described_class }
 
     it 'works with identified use cases' do
       expect(subject.check(email: nil)).to eq({ success: false })
@@ -10,22 +10,22 @@ describe EmailChecker do
       # allow same domain
       expect(subject.check(email: "martin@orange.fr")).to eq({ success: true })
       # find difference of 1 lev distance
-      expect(subject.check(email: "martin@orane.fr")).to eq({ success: true, email_suggestions: ['martin@orange.fr'] })
+      expect(subject.check(email: "martin@orane.fr")).to eq({ success: true, suggestions: ['martin@orange.fr'] })
       # find difference of 2 lev distance, only with same chars
-      expect(subject.check(email: "martin@oragne.fr")).to eq({ success: true, email_suggestions: ['martin@orange.fr'] })
+      expect(subject.check(email: "martin@oragne.fr")).to eq({ success: true, suggestions: ['martin@orange.fr'] })
       # ignore unknown domain
       expect(subject.check(email: "martin@ore.fr")).to eq({ success: true })
     end
 
     it 'passes through real use cases, with levenshtein_distance 1' do
-      expect(subject.check(email: "martin@asn.com")).to eq({ success: true, email_suggestions: ['martin@msn.com'] })
-      expect(subject.check(email: "martin@gamail.com")).to eq({ success: true, email_suggestions: ['martin@gmail.com'] })
-      expect(subject.check(email: "martin@glail.com")).to eq({ success: true, email_suggestions: ['martin@gmail.com'] })
-      expect(subject.check(email: "martin@gmail.coml")).to eq({ success: true, email_suggestions: ['martin@gmail.com'] })
-      expect(subject.check(email: "martin@gmail.con")).to eq({ success: true, email_suggestions: ['martin@gmail.com'] })
-      expect(subject.check(email: "martin@hotmil.fr")).to eq({ success: true, email_suggestions: ['martin@hotmail.fr'] })
-      expect(subject.check(email: "martin@mail.com")).to eq({ success: true, email_suggestions: ["martin@gmail.com", "martin@ymail.com", "martin@mailo.com"] })
-      expect(subject.check(email: "martin@msc.com")).to eq({ success: true, email_suggestions: ["martin@msn.com", "martin@mac.com"] })
+      expect(subject.check(email: "martin@asn.com")).to eq({ success: true, suggestions: ['martin@msn.com'] })
+      expect(subject.check(email: "martin@gamail.com")).to eq({ success: true, suggestions: ['martin@gmail.com'] })
+      expect(subject.check(email: "martin@glail.com")).to eq({ success: true, suggestions: ['martin@gmail.com'] })
+      expect(subject.check(email: "martin@gmail.coml")).to eq({ success: true, suggestions: ['martin@gmail.com'] })
+      expect(subject.check(email: "martin@gmail.con")).to eq({ success: true, suggestions: ['martin@gmail.com'] })
+      expect(subject.check(email: "martin@hotmil.fr")).to eq({ success: true, suggestions: ['martin@hotmail.fr'] })
+      expect(subject.check(email: "martin@mail.com")).to eq({ success: true, suggestions: ["martin@gmail.com", "martin@ymail.com", "martin@mailo.com"] })
+      expect(subject.check(email: "martin@msc.com")).to eq({ success: true, suggestions: ["martin@msn.com", "martin@mac.com"] })
       expect(subject.check(email: "martin@ymail.com")).to eq({ success: true })
     end