Display a warning page when an issuer already exists with a given adr…

…ess in DB

aidants_connect/settings.py

@@ -553,3 +553,12 @@ def getenv_bool(key: str, default: Optional[bool] = None) -> bool:
 
     Je vous contacte car je ne reçois pas les emails de confirmation de mon adresse email.""",
 )
+
+EMAIL_HABILITATION_ISSUER_EMAIL_ALREADY_EXISTS_FROM = os.getenv(
+    "EMAIL_HABILITATION_ISSUER_EMAIL_ALREADY_EXISTS_FROM", SUPPORT_EMAIL
+)
+
+EMAIL_HABILITATION_ISSUER_EMAIL_ALREADY_EXISTS_SUBJECT = os.getenv(
+    "EMAIL_HABILITATION_ISSUER_EMAIL_ALREADY_EXISTS_SUBJECT",
+    "Rappel de votre profil demandeur",
+)

aidants_connect_habilitation/templates/issuer_already_exists_warning.html

@@ -0,0 +1,15 @@
+{% extends 'layouts/main-habilitation.html' %}
+{% load static form_extras %}
+
+{% block title %}
+  Aidants Connect - Un compte demandeur existe déjà
+{% endblock %}
+
+{% block content %}
+  <div class="fr-container">
+    <p>
+      Un profil avec cette adresse email existe déjà. Nous venons d'envoyer un email à cette adresse contenant un lien
+      où vous pourrez retrouver toutes les demandes faites avec ce profil.
+    </p>
+  </div>
+{% endblock %}

aidants_connect_habilitation/tests/test_views.py

@@ -1,5 +1,5 @@
 from datetime import timedelta
-from unittest.mock import patch
+from unittest.mock import ANY, Mock, patch
 from uuid import UUID, uuid4
 
 from django.forms import model_to_dict
@@ -97,6 +97,33 @@ def test_redirect_valid_post_creates_an_email_confirmation(self):
                     "Request should have created an instance of IssuerEmailConfirmation"
                 )
 
+    @patch("aidants_connect_habilitation.views.send_mail")
+    def test_send_email_when_issuer_already_exists(self, send_mail_mock: Mock):
+        issuer: Issuer = IssuerFactory()
+
+        data = utils.get_form(IssuerForm).clean()
+        data["email"] = issuer.email
+
+        self.client.post(reverse(self.pattern_name), data)
+
+        send_mail_mock.assert_called_with(
+            from_email=settings.EMAIL_HABILITATION_ISSUER_EMAIL_ALREADY_EXISTS_FROM,
+            recipient_list=[issuer.email],
+            subject=settings.EMAIL_HABILITATION_ISSUER_EMAIL_ALREADY_EXISTS_SUBJECT,
+            message=ANY,
+            html_message=ANY,
+        )
+
+    def test_render_warning_when_issuer_already_exists(self):
+        issuer: Issuer = IssuerFactory()
+
+        data = utils.get_form(IssuerForm).clean()
+        data["email"] = issuer.email
+
+        response = self.client.post(reverse(self.pattern_name), data)
+
+        self.assertTemplateUsed(response, "issuer_already_exists_warning.html")
+
 
 @tag("habilitation")
 class IssuerEmailConfirmationWaitingViewTests(TestCase):

aidants_connect_habilitation/views.py

@@ -1,5 +1,7 @@
 from django.conf import settings
-from django.shortcuts import get_object_or_404, redirect
+from django.core.mail import send_mail
+from django.shortcuts import get_object_or_404, redirect, render
+from django.template import loader
 from django.urls import reverse
 from django.views.generic import FormView, RedirectView, TemplateView, View
 from django.views.generic.base import ContextMixin
@@ -113,14 +115,23 @@ class NewHabilitationView(RedirectView):
 
 
 class NewIssuerFormView(HabilitationStepMixin, FormView):
+    template_name = "issuer_form.html"
+    form_class = IssuerForm
+
     @property
     def step(self) -> HabilitationFormStep:
         return HabilitationFormStep.ISSUER
 
-    template_name = "issuer_form.html"
-    form_class = IssuerForm
+    def form_invalid(self, form: IssuerForm):
+        # Gets the error code of all the errors for email, if any
+        # See https://docs.djangoproject.com/en/dev/ref/forms/fields/#django.forms.Field.error_messages  # noqa
+        error_codes = [error.code for error in form.errors["email"].as_data()]
+        if "unique" in error_codes:
+            self.send_mail(form)
+            return render(self.request, "issuer_already_exists_warning.html")
+        return super().form_invalid(form)
 
-    def form_valid(self, form):
+    def form_valid(self, form: IssuerForm):
         self.saved_model: Issuer = form.save()
         IssuerEmailConfirmation.for_issuer(self.saved_model).send(self.request)
         return super().form_valid(form)
@@ -134,6 +145,26 @@ def get_success_url(self):
     def get_context_data(self, **kwargs):
         return {**super().get_context_data(**kwargs), "step": self.step}
 
+    def get_email_context_data(self, **kwargs):
+        return {**self.get_context_data(), **kwargs}
+
+    def send_mail(self, form: IssuerForm):
+        email = form.data["email"]
+        context = self.get_email_context_data(email=email)
+        text_message = loader.render_to_string(
+            "email/issuer_profile_reminder.txt", context
+        )
+        html_message = loader.render_to_string(
+            "email/issuer_profile_reminder.html", context
+        )
+        send_mail(
+            from_email=settings.EMAIL_HABILITATION_ISSUER_EMAIL_ALREADY_EXISTS_FROM,
+            recipient_list=[email],
+            subject=settings.EMAIL_HABILITATION_ISSUER_EMAIL_ALREADY_EXISTS_SUBJECT,
+            message=text_message,
+            html_message=html_message,
+        )
+
 
 class IssuerEmailConfirmationWaitingView(
     HabilitationStepMixin, CheckIssuerMixin, TemplateView