Return an error message when an admin try to delete the only admin account

backend/core/views.py

@@ -57,7 +57,7 @@
 
 from django.db import models
 
-from iam.models import User, RoleAssignment, Folder
+from iam.models import User, UserGroup, RoleAssignment, Folder
 
 User = get_user_model()
 
@@ -835,6 +835,26 @@ def get_queryset(self):
         # TODO: Implement a proper filter for the queryset
         return User.objects.all()
 
+    def update(self, request: Request, *args, **kwargs) -> Response:
+        user = self.get_object()
+        if user.is_admin() :
+            number_of_admin_users = User.get_admin_users().count()
+            admin_group = UserGroup.objects.get(name="BI-UG-ADM")
+            if number_of_admin_users == 1 :
+                new_user_groups = set(request.data["user_groups"])
+                if str(admin_group.pk) not in new_user_groups :
+                    return Response({"error":"attemptToRemoveOnlyAdminUserGroup"},status=HTTP_403_FORBIDDEN)
+
+        return super().update(request, *args, **kwargs)
+
+    def destroy(self, request, *args, **kwargs):
+        user = self.get_object()
+        if user.is_admin() :
+            number_of_admin_users = User.get_admin_users().count()
+            if number_of_admin_users == 1 :
+                return Response({"error":"attemptToDeleteOnlyAdminAccountError"},status=HTTP_403_FORBIDDEN)
+
+        return super().destroy(request,*args,**kwargs)
 
 class UserGroupViewSet(BaseModelViewSet):
     """

backend/iam/models.py

@@ -236,7 +236,6 @@ def get_user_groups(user):
                 user_group_list.append(user_group)
         return user_group_list
 
-
 class UserManager(BaseUserManager):
     use_in_migrations = True
 
@@ -291,7 +290,6 @@ def create_superuser(self, email, password=None, **extra_fields):
         UserGroup.objects.get(name="BI-UG-ADM").user_set.add(superuser)
         return superuser
 
-
 class User(AbstractBaseUser, AbstractBaseModel, FolderMixin):
     """a user is a principal corresponding to a human"""
 
@@ -471,6 +469,12 @@ def permissions(self):
     def set_username(self, username):
         self.email = username
 
+    @staticmethod
+    def get_admin_users() -> List[Self] :
+        return User.objects.filter(user_groups__name="BI-UG-ADM")
+
+    def is_admin(self) -> bool :
+        return self.user_groups.filter(name="BI-UG-ADM").exists()
 
 class Role(NameDescriptionMixin, FolderMixin):
     """A role is a list of permissions"""

frontend/messages/en.json

@@ -492,5 +492,7 @@
 	"invalidLibraryFileError": "Invalid library file. Please make sure the format is correct.",
 	"taintedFormMessage": "Do you want to leave this page? Changes you made may not be saved.",
 	"riskScenariosStatus": "Risk scenarios status",
-	"onlineDocs": "Online documentation"
+	"onlineDocs": "Online documentation",
+	"attemptToDeleteOnlyAdminAccountError": "You can't delete the only admin account of your application.",
+	"attemptToRemoveOnlyAdminUserGroup": "You can't remove the only admin user of the application from the admin user group."
 }

frontend/messages/fr.json

@@ -492,5 +492,7 @@
 	"invalidLibraryFileError": "Fichier de bibliothèque invalide. Veuillez vérifier le format du fichier.",
 	"taintedFormMessage": "Voulez-vous vraiment quitter cette page ? Toutes les données non enregistrées seront perdues.",
 	"riskScenariosStatus": "Statut des scénarios de risque",
-	"onlineDocs": "Documentation en ligne"
+	"onlineDocs": "Documentation en ligne",
+	"attemptToDeleteOnlyAdminAccountError": "Vous ne pouvez pas supprimer votre unique compte administrateur de l'application.",
+	"attemptToRemoveOnlyAdminUserGroup": "Vous ne pouvez pas retirer le seul compte administrateur de l'application du groupe des administrateurs."
 }

frontend/src/lib/utils/locales.ts

@@ -309,7 +309,9 @@ export function localItems(languageTag: string): LocalItems {
 		highSOK: m.highSOK({ languageTag: languageTag }),
 		libraryImportError: m.libraryImportError({ languageTag: languageTag }),
 		libraryAlreadyExistsError: m.libraryAlreadyImportedError({ languageTag: languageTag }),
-		invalidLibraryFileError: m.invalidLibraryFileError({ languageTag: languageTag })
+		invalidLibraryFileError: m.invalidLibraryFileError({ languageTag: languageTag }),
+		attemptToDeleteOnlyAdminAccountError: m.attemptToDeleteOnlyAdminAccountError({ languageTag: languageTag }),
+		attemptToRemoveOnlyAdminUserGroup: m.attemptToRemoveOnlyAdminUserGroup({ languageTag: languageTag })
 	};
 	return LOCAL_ITEMS;
 }

frontend/src/routes/(app)/[model=urlmodel]/+page.server.ts

@@ -155,6 +155,10 @@ export const actions: Actions = {
 			if (!res.ok) {
 				const response = await res.json();
 				console.log(response);
+				if (response.error) {
+					setFlash({ type: 'error', message: localItems(languageTag())[response.error] }, event);
+					return fail(403, { form: deleteForm });
+				}
 				if (response.non_field_errors) {
 					setError(deleteForm, 'non_field_errors', response.non_field_errors);
 				}

frontend/src/routes/(app)/[model=urlmodel]/[id=uuid]/edit/+page.server.ts

@@ -35,6 +35,10 @@ export const actions: Actions = {
 		if (!res.ok) {
 			const response = await res.json();
 			console.error('server response:', response);
+			if (response.error) {
+				setFlash({ type: 'error', message: response.error }, event);
+				return fail(403, { form: form });
+			}
 			if (response.non_field_errors) {
 				setError(form, 'non_field_errors', response.non_field_errors);
 			}

frontend/src/routes/(app)/users/[id=uuid]/edit/+page.server.ts

@@ -2,11 +2,12 @@ import { BASE_API_URL } from '$lib/utils/constants';
 import { UserEditSchema } from '$lib/utils/schemas';
 import { setError, superValidate } from 'sveltekit-superforms/server';
 import type { PageServerLoad } from './$types';
-import { redirect, type Actions } from '@sveltejs/kit';
-import { fail } from 'assert';
+import { redirect, fail, type Actions } from '@sveltejs/kit';
 import { getModelInfo } from '$lib/utils/crud';
 import { setFlash } from 'sveltekit-flash-message/server';
 import * as m from '$paraglide/messages';
+import { languageTag } from '$paraglide/runtime';
+import { localItems } from '$lib/utils/locales';
 
 export const load: PageServerLoad = async ({ params, fetch }) => {
 	const URLModel = 'users';
@@ -58,6 +59,10 @@ export const actions: Actions = {
 		if (!res.ok) {
 			const response = await res.json();
 			console.error('server response:', response);
+			if (response.error) {
+				setFlash({ type: 'error', message: localItems(languageTag())[response.error] }, event);
+				return fail(403, { form: form });
+			}
 			if (response.non_field_errors) {
 				setError(form, 'non_field_errors', response.non_field_errors);
 			}