Fix #113. Fix regex in views.

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

apps/activity/api/views.py

@@ -1,9 +1,9 @@
 # Copyright (C) 2018-2024 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from api.viewsets import ReadProtectedModelViewSet
 from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework.filters import SearchFilter
+from api.filters import RegexSafeSearchFilter
+from api.viewsets import ReadProtectedModelViewSet
 
 from .serializers import ActivitySerializer, ActivityTypeSerializer, EntrySerializer, GuestSerializer
 from ..models import Activity, ActivityType, Entry, Guest
@@ -29,7 +29,7 @@ class ActivityViewSet(ReadProtectedModelViewSet):
     """
     queryset = Activity.objects.order_by('id')
     serializer_class = ActivitySerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['name', 'description', 'activity_type', 'location', 'creater', 'organizer', 'attendees_club',
                         'date_start', 'date_end', 'valid', 'open', ]
     search_fields = ['$name', '$description', '$location', '$creater__last_name', '$creater__first_name',
@@ -47,7 +47,7 @@ class GuestViewSet(ReadProtectedModelViewSet):
     """
     queryset = Guest.objects.order_by('id')
     serializer_class = GuestSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['activity', 'activity__name', 'last_name', 'first_name', 'inviter', 'inviter__alias__name',
                         'inviter__alias__normalized_name', ]
     search_fields = ['$activity__name', '$last_name', '$first_name', '$inviter__user__email', '$inviter__alias__name',
@@ -62,7 +62,7 @@ class EntryViewSet(ReadProtectedModelViewSet):
     """
     queryset = Entry.objects.order_by('id')
     serializer_class = EntrySerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['activity', 'time', 'note', 'guest', ]
     search_fields = ['$activity__name', '$note__user__email', '$note__alias__name', '$note__alias__normalized_name',
                      '$guest__last_name', '$guest__first_name', ]

apps/activity/views.py

@@ -18,6 +18,7 @@ from django.views import View
 from django.views.decorators.cache import cache_page
 from django.views.generic import DetailView, TemplateView, UpdateView
 from django_tables2.views import SingleTableView
+from api.viewsets import is_regex
 from note.models import Alias, NoteSpecial, NoteUser
 from permission.backends import PermissionBackend
 from permission.views import ProtectQuerysetMixin, ProtectedCreateView
@@ -198,13 +199,16 @@ class ActivityEntryView(LoginRequiredMixin, TemplateView):
 
         if "search" in self.request.GET and self.request.GET["search"]:
             pattern = self.request.GET["search"]
-            if pattern[0] != "^":
-                pattern = "^" + pattern
+
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix = "__iregex" if valid_regex else "__istartswith"
+            pattern = "^" + pattern if valid_regex and pattern[0] != "^" else pattern
             guest_qs = guest_qs.filter(
-                Q(first_name__iregex=pattern)
-                | Q(last_name__iregex=pattern)
-                | Q(inviter__alias__name__iregex=pattern)
-                | Q(inviter__alias__normalized_name__iregex=Alias.normalize(pattern))
+                Q(**{f"first_name{suffix}": pattern})
+                | Q(**{f"last_name{suffix}": pattern})
+                | Q(**{f"inviter__alias__name{suffix}": pattern})
+                | Q(**{f"inviter__alias__normalized_name{suffix}": Alias.normalize(pattern)})
             )
         else:
             guest_qs = guest_qs.none()
@@ -236,11 +240,15 @@ class ActivityEntryView(LoginRequiredMixin, TemplateView):
 
         if "search" in self.request.GET and self.request.GET["search"]:
             pattern = self.request.GET["search"]
+
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix = "__iregex" if valid_regex else "__icontains"
             note_qs = note_qs.filter(
-                Q(note__noteuser__user__first_name__iregex=pattern)
-                | Q(note__noteuser__user__last_name__iregex=pattern)
-                | Q(name__iregex=pattern)
-                | Q(normalized_name__iregex=Alias.normalize(pattern))
+                Q(**{f"note__noteuser__user__first_name{suffix}": pattern})
+                | Q(**{f"note__noteuser__user__last_name{suffix}": pattern})
+                | Q(**{f"name{suffix}": pattern})
+                | Q(**{f"normalized_name{suffix}": Alias.normalize(pattern)})
             )
         else:
             note_qs = note_qs.none()

apps/api/filters.py

@@ -0,0 +1,42 @@
+import re
+from functools import lru_cache
+
+from rest_framework.filters import SearchFilter
+
+
+class RegexSafeSearchFilter(SearchFilter):
+    @lru_cache
+    def validate_regex(self, search_term) -> bool:
+        try:
+            re.compile(search_term)
+            return True
+        except re.error:
+            return False
+
+    def get_search_fields(self, view, request):
+        """
+        Ensure that given regex are valid.
+        If not, we consider that the user is trying to search by substring.
+        """
+        search_fields = super().get_search_fields(view, request)
+        search_terms = self.get_search_terms(request)
+
+        for search_term in search_terms:
+            if not self.validate_regex(search_term):
+                # Invalid regex. We assume we don't query by regex but by substring.
+                search_fields = [f.replace('$', '') for f in search_fields]
+                break
+
+        return search_fields
+
+    def get_search_terms(self, request):
+        """
+        Ensure that search field is a valid regex query. If not, we remove extra characters.
+        """
+        terms = super().get_search_terms(request)
+        if not all(self.validate_regex(term) for term in terms):
+            # Invalid regex. If a ^ is prefixed to the search term, we remove it.
+            terms = [term[1:] if term[0] == '^' else term for term in terms]
+            # Same for dollars.
+            terms = [term[:-1] if term[-1] == '$' else term for term in terms]
+        return terms

apps/api/tests.py

@@ -12,11 +12,12 @@ from django.contrib.contenttypes.models import ContentType
 from django.db.models.fields.files import ImageFieldFile
 from django.test import TestCase
 from django_filters.rest_framework import DjangoFilterBackend
+from phonenumbers import PhoneNumber
+from rest_framework.filters import OrderingFilter
+from api.filters import RegexSafeSearchFilter
 from member.models import Membership, Club
 from note.models import NoteClub, NoteUser, Alias, Note
 from permission.models import PermissionMask, Permission, Role
-from phonenumbers import PhoneNumber
-from rest_framework.filters import SearchFilter, OrderingFilter
 
 from .viewsets import ContentTypeViewSet, UserViewSet
 
@@ -87,7 +88,7 @@ class TestAPI(TestCase):
                     resp = self.client.get(url + f"?ordering=-{field}")
                     self.assertEqual(resp.status_code, 200)
 
-            if SearchFilter in backends:
+            if RegexSafeSearchFilter in backends:
                 # Basic search
                 for field in viewset.search_fields:
                     obj = self.fix_note_object(obj, field)

apps/api/viewsets.py

@@ -1,19 +1,29 @@
 # Copyright (C) 2018-2024 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+import re
+
 from django.contrib.contenttypes.models import ContentType
 from django_filters.rest_framework import DjangoFilterBackend
 from django.db.models import Q
 from django.conf import settings
 from django.contrib.auth.models import User
-from rest_framework.filters import SearchFilter
 from rest_framework.viewsets import ReadOnlyModelViewSet, ModelViewSet
 from permission.backends import PermissionBackend
 from note.models import Alias
 
+from .filters import RegexSafeSearchFilter
 from .serializers import UserSerializer, ContentTypeSerializer
 
 
+def is_regex(pattern):
+    try:
+        re.compile(pattern)
+        return True
+    except (re.error, TypeError):
+        return False
+
+
 class ReadProtectedModelViewSet(ModelViewSet):
     """
     Protect a ModelViewSet by filtering the objects that the user cannot see.
@@ -60,34 +70,38 @@ class UserViewSet(ReadProtectedModelViewSet):
 
         if "search" in self.request.GET:
             pattern = self.request.GET["search"]
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix = "__iregex" if valid_regex else "__istartswith"
+            prefix = "^" if valid_regex else ""
 
             # Filter with different rules
             # We use union-all to keep each filter rule sorted in result
             queryset = queryset.filter(
                 # Match without normalization
-                note__alias__name__iregex="^" + pattern
+                Q(**{f"note__alias__name{suffix}": prefix + pattern})
             ).union(
                 queryset.filter(
                     # Match with normalization
-                    Q(note__alias__normalized_name__iregex="^" + Alias.normalize(pattern))
-                    & ~Q(note__alias__name__iregex="^" + pattern)
+                    Q(**{f"note__alias__normalized_name{suffix}": prefix + Alias.normalize(pattern)})
+                    & ~Q(**{f"note__alias__name{suffix}": prefix + pattern})
                 ),
                 all=True,
             ).union(
                 queryset.filter(
                     # Match on lower pattern
-                    Q(note__alias__normalized_name__iregex="^" + pattern.lower())
-                    & ~Q(note__alias__normalized_name__iregex="^" + Alias.normalize(pattern))
-                    & ~Q(note__alias__name__iregex="^" + pattern)
+                    Q(**{f"note__alias__normalized_name{suffix}": prefix + pattern.lower()})
+                    & ~Q(**{f"note__alias__normalized_name{suffix}": prefix + Alias.normalize(pattern)})
+                    & ~Q(**{f"note__alias__name{suffix}": prefix + pattern})
                 ),
                 all=True,
             ).union(
                 queryset.filter(
                     # Match on firstname or lastname
-                    (Q(last_name__iregex="^" + pattern) | Q(first_name__iregex="^" + pattern))
-                    & ~Q(note__alias__normalized_name__iregex="^" + pattern.lower())
-                    & ~Q(note__alias__normalized_name__iregex="^" + Alias.normalize(pattern))
-                    & ~Q(note__alias__name__iregex="^" + pattern)
+                    (Q(**{f"last_name{suffix}": prefix + pattern}) | Q(**{f"first_name{suffix}": prefix + pattern}))
+                    & ~Q(**{f"note__alias__normalized_name{suffix}": prefix + pattern.lower()})
+                    & ~Q(**{f"note__alias__normalized_name{suffix}": prefix + Alias.normalize(pattern)})
+                    & ~Q(**{f"note__alias__name{suffix}": prefix + pattern})
                 ),
                 all=True,
             )
@@ -107,6 +121,6 @@ class ContentTypeViewSet(ReadOnlyModelViewSet):
     """
     queryset = ContentType.objects.order_by('id')
     serializer_class = ContentTypeSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['id', 'app_label', 'model', ]
     search_fields = ['$app_label', '$model', ]

apps/member/api/views.py

@@ -2,7 +2,8 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework.filters import OrderingFilter, SearchFilter
+from rest_framework.filters import OrderingFilter
+from api.filters import RegexSafeSearchFilter
 from api.viewsets import ReadProtectedModelViewSet
 
 from .serializers import ProfileSerializer, ClubSerializer, MembershipSerializer
@@ -17,7 +18,7 @@ class ProfileViewSet(ReadProtectedModelViewSet):
     """
     queryset = Profile.objects.order_by('id')
     serializer_class = ProfileSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['user', 'user__first_name', 'user__last_name', 'user__username', 'user__email',
                         'user__note__alias__name', 'user__note__alias__normalized_name', 'phone_number', "section",
                         'department', 'promotion', 'address', 'paid', 'ml_events_registration', 'ml_sport_registration',
@@ -34,7 +35,7 @@ class ClubViewSet(ReadProtectedModelViewSet):
     """
     queryset = Club.objects.order_by('id')
     serializer_class = ClubSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['name', 'email', 'note__alias__name', 'note__alias__normalized_name', 'parent_club',
                         'parent_club__name', 'require_memberships', 'membership_fee_paid', 'membership_fee_unpaid',
                         'membership_duration', 'membership_start', 'membership_end', ]
@@ -49,7 +50,7 @@ class MembershipViewSet(ReadProtectedModelViewSet):
     """
     queryset = Membership.objects.order_by('id')
     serializer_class = MembershipSerializer
-    filter_backends = [DjangoFilterBackend, OrderingFilter, SearchFilter]
+    filter_backends = [DjangoFilterBackend, OrderingFilter, RegexSafeSearchFilter]
     filterset_fields = ['club__name', 'club__email', 'club__note__alias__name', 'club__note__alias__normalized_name',
                         'user__username', 'user__last_name', 'user__first_name', 'user__email',
                         'user__note__alias__name', 'user__note__alias__normalized_name',

apps/member/views.py

@@ -18,6 +18,7 @@ from django.views.generic import DetailView, UpdateView, TemplateView
 from django.views.generic.edit import FormMixin
 from django_tables2.views import SingleTableView
 from rest_framework.authtoken.models import Token
+from api.viewsets import is_regex
 from note.models import Alias, NoteClub, NoteUser, Trust
 from note.models.transactions import Transaction, SpecialTransaction
 from note.tables import HistoryTable, AliasTable, TrustTable, TrustedTable
@@ -219,16 +220,20 @@ class UserListView(ProtectQuerysetMixin, LoginRequiredMixin, SingleTableView):
         if "search" in self.request.GET and self.request.GET["search"]:
             pattern = self.request.GET["search"]
 
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix = "__iregex" if valid_regex else "__istartswith"
+            prefix = "^" if valid_regex else ""
             qs = qs.filter(
-                username__iregex="^" + pattern
+                Q(**{f"username{suffix}": prefix + pattern})
             ).union(
                 qs.filter(
-                    (Q(alias__iregex="^" + pattern)
-                     | Q(normalized_alias__iregex="^" + Alias.normalize(pattern))
-                     | Q(last_name__iregex="^" + pattern)
-                     | Q(first_name__iregex="^" + pattern)
+                    (Q(**{f"alias{suffix}": prefix + pattern})
+                     | Q(**{f"normalized_alias{suffix}": prefix + Alias.normalize(pattern)})
+                     | Q(**{f"last_name{suffix}": prefix + pattern})
+                     | Q(**{f"first_name{suffix}": prefix + pattern})
                      | Q(email__istartswith=pattern))
-                    & ~Q(username__iregex="^" + pattern)
+                    & ~Q(**{f"username{suffix}": prefix + pattern})
                 ), all=True)
         else:
             qs = qs.none()
@@ -407,10 +412,15 @@ class ClubListView(ProtectQuerysetMixin, LoginRequiredMixin, SingleTableView):
         if "search" in self.request.GET:
             pattern = self.request.GET["search"]
 
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix = "__iregex" if valid_regex else "__istartswith"
+            prefix = "^" if valid_regex else ""
+
             qs = qs.filter(
-                Q(name__iregex=pattern)
-                | Q(note__alias__name__iregex=pattern)
-                | Q(note__alias__normalized_name__iregex=Alias.normalize(pattern))
+                Q(**{f"name{suffix}": prefix + pattern})
+                | Q(**{f"note__alias__name{suffix}": prefix + pattern})
+                | Q(**{f"note__alias__normalized_name{suffix}": prefix + Alias.normalize(pattern)})
             )
 
         return qs
@@ -909,10 +919,15 @@ class ClubMembersListView(ProtectQuerysetMixin, LoginRequiredMixin, SingleTableV
 
         if 'search' in self.request.GET:
             pattern = self.request.GET['search']
+
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix = "__iregex" if valid_regex else "__istartswith"
+            prefix = "^" if valid_regex else ""
             qs = qs.filter(
-                Q(user__first_name__iregex='^' + pattern)
-                | Q(user__last_name__iregex='^' + pattern)
-                | Q(user__note__alias__normalized_name__iregex='^' + Alias.normalize(pattern))
+                Q(**{f"user__first_name{suffix}": prefix + pattern})
+                | Q(**{f"user__last_name{suffix}": prefix + pattern})
+                | Q(**{f"user__note__alias__normalized_name{suffix}": prefix + Alias.normalize(pattern)})
             )
 
         only_active = "only_active" not in self.request.GET or self.request.GET["only_active"] != '0'

apps/note/api/views.py

@@ -1,16 +1,16 @@
 # Copyright (C) 2018-2024 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
-import re
 
 from django.conf import settings
 from django.db.models import Q
 from django.core.exceptions import ValidationError
 from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework.filters import OrderingFilter, SearchFilter
-from rest_framework import viewsets
+from rest_framework.filters import OrderingFilter
+from rest_framework import status, viewsets
 from rest_framework.response import Response
-from rest_framework import status
-from api.viewsets import ReadProtectedModelViewSet, ReadOnlyProtectedModelViewSet
+from api.filters import RegexSafeSearchFilter
+from api.viewsets import ReadProtectedModelViewSet, ReadOnlyProtectedModelViewSet, \
+    is_regex
 from permission.backends import PermissionBackend
 
 from .serializers import NotePolymorphicSerializer, AliasSerializer, ConsumerSerializer, \
@@ -29,7 +29,7 @@ class NotePolymorphicViewSet(ReadProtectedModelViewSet):
     """
     queryset = Note.objects.order_by('id')
     serializer_class = NotePolymorphicSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter, OrderingFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter, OrderingFilter]
     filterset_fields = ['alias__name', 'polymorphic_ctype', 'is_active', 'balance', 'last_negative', 'created_at', ]
     search_fields = ['$alias__normalized_name', '$alias__name', '$polymorphic_ctype__model',
                      '$noteuser__user__last_name', '$noteuser__user__first_name', '$noteuser__user__email',
@@ -48,10 +48,14 @@ class NotePolymorphicViewSet(ReadProtectedModelViewSet):
             .distinct()
 
         alias = self.request.query_params.get("alias", ".*")
+        # Check if this is a valid regex. If not, we won't check regex
+        valid_regex = is_regex(alias)
+        suffix = '__iregex' if valid_regex else '__istartswith'
+        alias_prefix = '^' if valid_regex else ''
         queryset = queryset.filter(
-            Q(alias__name__iregex="^" + alias)
-            | Q(alias__normalized_name__iregex="^" + Alias.normalize(alias))
-            | Q(alias__normalized_name__iregex="^" + alias.lower())
+            Q(**{f"alias__name{suffix}": alias_prefix + alias})
+            | Q(**{f"alias__normalized_name{suffix}": alias_prefix + Alias.normalize(alias)})
+            | Q(**{f"alias__normalized_name{suffix}": alias_prefix + alias.lower()})
         )
 
         return queryset.order_by("id")
@@ -65,7 +69,7 @@ class TrustViewSet(ReadProtectedModelViewSet):
     """
     queryset = Trust.objects
     serializer_class = TrustSerializer
-    filter_backends = [SearchFilter, DjangoFilterBackend, OrderingFilter]
+    filter_backends = [RegexSafeSearchFilter, DjangoFilterBackend, OrderingFilter]
     search_fields = ['$trusting__alias__name', '$trusting__alias__normalized_name',
                      '$trusted__alias__name', '$trusted__alias__normalized_name']
     filterset_fields = ['trusting', 'trusting__noteuser__user', 'trusted', 'trusted__noteuser__user']
@@ -91,11 +95,11 @@ class AliasViewSet(ReadProtectedModelViewSet):
     """
     REST API View set.
     The djangorestframework plugin will get all `Alias` objects, serialize it to JSON with the given serializer,
-    then render it on /api/note/aliases/
+    then render it on /api/note/alias/
     """
     queryset = Alias.objects
     serializer_class = AliasSerializer
-    filter_backends = [SearchFilter, DjangoFilterBackend, OrderingFilter]
+    filter_backends = [RegexSafeSearchFilter, DjangoFilterBackend, OrderingFilter]
     search_fields = ['$normalized_name', '$name', '$note__polymorphic_ctype__model', ]
     filterset_fields = ['name', 'normalized_name', 'note', 'note__noteuser__user',
                         'note__noteclub__club', 'note__polymorphic_ctype__model', ]
@@ -126,18 +130,22 @@ class AliasViewSet(ReadProtectedModelViewSet):
 
         alias = self.request.query_params.get("alias", None)
         if alias:
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(alias)
+            suffix = '__iregex' if valid_regex else '__istartswith'
+            alias_prefix = '^' if valid_regex else ''
             queryset = queryset.filter(
-                name__iregex="^" + alias
+                **{f"name{suffix}": alias_prefix + alias}
             ).union(
                 queryset.filter(
-                    Q(normalized_name__iregex="^" + Alias.normalize(alias))
-                    & ~Q(name__iregex="^" + alias)
+                    Q(**{f"normalized_name{suffix}": alias_prefix + Alias.normalize(alias)})
+                    & ~Q(**{f"name{suffix}": alias_prefix + alias})
                 ),
                 all=True).union(
                 queryset.filter(
-                    Q(normalized_name__iregex="^" + alias.lower())
-                    & ~Q(normalized_name__iregex="^" + Alias.normalize(alias))
-                    & ~Q(name__iregex="^" + alias)
+                    Q(**{f"normalized_name{suffix}": "^" + alias.lower()})
+                    & ~Q(**{f"normalized_name{suffix}": "^" + Alias.normalize(alias)})
+                    & ~Q(**{f"name{suffix}": "^" + alias})
                 ),
                 all=True)
 
@@ -147,7 +155,7 @@ class AliasViewSet(ReadProtectedModelViewSet):
 class ConsumerViewSet(ReadOnlyProtectedModelViewSet):
     queryset = Alias.objects
     serializer_class = ConsumerSerializer
-    filter_backends = [SearchFilter, OrderingFilter, DjangoFilterBackend]
+    filter_backends = [RegexSafeSearchFilter, OrderingFilter, DjangoFilterBackend]
     search_fields = ['$normalized_name', '$name', '$note__polymorphic_ctype__model', ]
     filterset_fields = ['name', 'normalized_name', 'note', 'note__noteuser__user',
                         'note__noteclub__club', 'note__polymorphic_ctype__model', ]
@@ -166,11 +174,7 @@ class ConsumerViewSet(ReadOnlyProtectedModelViewSet):
 
         alias = self.request.query_params.get("alias", None)
         # Check if this is a valid regex. If not, we won't check regex
-        try:
-            re.compile(alias)
-            valid_regex = True
-        except (re.error, TypeError):
-            valid_regex = False
+        valid_regex = is_regex(alias)
         suffix = '__iregex' if valid_regex else '__istartswith'
         alias_prefix = '^' if valid_regex else ''
         queryset = queryset.prefetch_related('note')
@@ -207,7 +211,7 @@ class TemplateCategoryViewSet(ReadProtectedModelViewSet):
     """
     queryset = TemplateCategory.objects.order_by('name')
     serializer_class = TemplateCategorySerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['name', 'templates', 'templates__name']
     search_fields = ['$name', '$templates__name', ]
 
@@ -220,7 +224,7 @@ class TransactionTemplateViewSet(viewsets.ModelViewSet):
     """
     queryset = TransactionTemplate.objects.order_by('name')
     serializer_class = TransactionTemplateSerializer
-    filter_backends = [SearchFilter, DjangoFilterBackend, OrderingFilter]
+    filter_backends = [RegexSafeSearchFilter, DjangoFilterBackend, OrderingFilter]
     filterset_fields = ['name', 'amount', 'display', 'category', 'category__name', ]
     search_fields = ['$name', '$category__name', ]
     ordering_fields = ['amount', ]
@@ -234,7 +238,7 @@ class TransactionViewSet(ReadProtectedModelViewSet):
     """
     queryset = Transaction.objects.order_by('-created_at')
     serializer_class = TransactionPolymorphicSerializer
-    filter_backends = [SearchFilter, DjangoFilterBackend, OrderingFilter]
+    filter_backends = [RegexSafeSearchFilter, DjangoFilterBackend, OrderingFilter]
     filterset_fields = ['source', 'source_alias', 'source__alias__name', 'source__alias__normalized_name',
                         'destination', 'destination_alias', 'destination__alias__name',
                         'destination__alias__normalized_name', 'quantity', 'polymorphic_ctype', 'amount',

apps/note/views.py

@@ -13,6 +13,7 @@ from django.views.generic import CreateView, UpdateView, DetailView
 from django.urls import reverse_lazy
 from django_tables2 import SingleTableView
 from activity.models import Entry
+from api.viewsets import is_regex
 from permission.backends import PermissionBackend
 from permission.views import ProtectQuerysetMixin
 from note_kfet.inputs import AmountInput
@@ -89,11 +90,15 @@ class TransactionTemplateListView(ProtectQuerysetMixin, LoginRequiredMixin, Sing
         qs = super().get_queryset().distinct()
         if "search" in self.request.GET:
             pattern = self.request.GET["search"]
+
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix = "__iregex" if valid_regex else "__icontains"
             qs = qs.filter(
-                Q(name__iregex=pattern)
-                | Q(destination__club__name__iregex=pattern)
-                | Q(category__name__iregex=pattern)
-                | Q(description__iregex=pattern)
+                Q(**{f"name{suffix}": pattern})
+                | Q(**{f"destination__club__name{suffix}": pattern})
+                | Q(**{f"category__name{suffix}": pattern})
+                | Q(**{f"description{suffix}": pattern})
             )
 
         qs = qs.order_by('-display', 'category__name', 'destination__club__name', 'name')
@@ -223,7 +228,10 @@ class TransactionSearchView(ProtectQuerysetMixin, LoginRequiredMixin, DetailView
         if "type" in data and data["type"]:
             transactions = transactions.filter(polymorphic_ctype__in=data["type"])
         if "reason" in data and data["reason"]:
-            transactions = transactions.filter(reason__iregex=data["reason"])
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(data["reason"])
+            suffix = "__iregex" if valid_regex else "__istartswith"
+            transactions = transactions.filter(Q(**{f"reason{suffix}": data["reason"]}))
         if "valid" in data and data["valid"]:
             transactions = transactions.filter(valid=data["valid"])
         if "amount_gte" in data and data["amount_gte"]:

apps/permission/api/views.py

@@ -1,9 +1,9 @@
 # Copyright (C) 2018-2024 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from api.viewsets import ReadOnlyProtectedModelViewSet
 from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework.filters import SearchFilter
+from api.filters import RegexSafeSearchFilter
+from api.viewsets import ReadOnlyProtectedModelViewSet
 
 from .serializers import PermissionSerializer, RoleSerializer
 from ..models import Permission, Role
@@ -17,9 +17,9 @@ class PermissionViewSet(ReadOnlyProtectedModelViewSet):
     """
     queryset = Permission.objects.order_by('id')
     serializer_class = PermissionSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['model', 'type', 'query', 'mask', 'field', 'permanent', ]
-    search_fields = ['$model__name', '$query', '$description', ]
+    search_fields = ['$model__model', '$query', '$description', ]
 
 
 class RoleViewSet(ReadOnlyProtectedModelViewSet):
@@ -30,6 +30,6 @@ class RoleViewSet(ReadOnlyProtectedModelViewSet):
     """
     queryset = Role.objects.order_by('id')
     serializer_class = RoleSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['name', 'permissions', 'for_club', 'memberships__user', ]
     search_fields = ['$name', '$for_club__name', ]

apps/registration/views.py

@@ -15,6 +15,7 @@ from django.views import View
 from django.views.generic import CreateView, TemplateView, DetailView
 from django.views.generic.edit import FormMixin
 from django_tables2 import SingleTableView
+from api.viewsets import is_regex
 from member.forms import ProfileForm
 from member.models import Membership, Club
 from note.models import SpecialTransaction, Alias
@@ -191,11 +192,16 @@ class FutureUserListView(ProtectQuerysetMixin, LoginRequiredMixin, SingleTableVi
         if "search" in self.request.GET and self.request.GET["search"]:
             pattern = self.request.GET["search"]
 
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix_username = "__iregex" if valid_regex else "__icontains"
+            suffix = "__iregex" if valid_regex else "__istartswith"
+            prefix = "^" if valid_regex else ""
             qs = qs.filter(
-                Q(first_name__iregex=pattern)
-                | Q(last_name__iregex=pattern)
-                | Q(profile__section__iregex=pattern)
-                | Q(username__iregex="^" + pattern)
+                Q(**{f"first_name{suffix}": pattern})
+                | Q(**{f"last_name{suffix}": pattern})
+                | Q(**{f"profile__section{suffix}": pattern})
+                | Q(**{f"username{suffix_username}": prefix + pattern})
             )
 
         return qs

apps/treasury/api/views.py

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework.filters import SearchFilter
+from api.filters import RegexSafeSearchFilter
 from api.viewsets import ReadProtectedModelViewSet
 
 from .serializers import InvoiceSerializer, ProductSerializer, RemittanceTypeSerializer, RemittanceSerializer, \
@@ -18,7 +18,7 @@ class InvoiceViewSet(ReadProtectedModelViewSet):
     """
     queryset = Invoice.objects.order_by('id')
     serializer_class = InvoiceSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['bde', 'object', 'description', 'name', 'address', 'date', 'acquitted', 'locked', ]
     search_fields = ['$object', '$description', '$name', '$address', ]
 
@@ -31,7 +31,7 @@ class ProductViewSet(ReadProtectedModelViewSet):
     """
     queryset = Product.objects.order_by('invoice_id', 'id')
     serializer_class = ProductSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['invoice', 'designation', 'quantity', 'amount', ]
     search_fields = ['$designation', '$invoice__object', ]
 
@@ -44,7 +44,7 @@ class RemittanceTypeViewSet(ReadProtectedModelViewSet):
     """
     queryset = RemittanceType.objects.order_by('id')
     serializer_class = RemittanceTypeSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['note', ]
     search_fields = ['$note__special_type', ]
 
@@ -57,7 +57,7 @@ class RemittanceViewSet(ReadProtectedModelViewSet):
     """
     queryset = Remittance.objects.order_by('id')
     serializer_class = RemittanceSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['date', 'remittance_type', 'comment', 'closed', 'transaction_proxies__transaction', ]
     search_fields = ['$remittance_type__note__special_type', '$comment', ]
 
@@ -70,7 +70,7 @@ class SogeCreditViewSet(ReadProtectedModelViewSet):
     """
     queryset = SogeCredit.objects.order_by('id')
     serializer_class = SogeCreditSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['user', 'user__last_name', 'user__first_name', 'user__email', 'user__note__alias__name',
                         'user__note__alias__normalized_name', 'transactions', 'credit_transaction', ]
     search_fields = ['$user__last_name', '$user__first_name', '$user__email', '$user__note__alias__name',

apps/treasury/views.py

@@ -20,6 +20,7 @@ from django.views.generic import UpdateView, DetailView
 from django.views.generic.base import View, TemplateView
 from django.views.generic.edit import BaseFormView, DeleteView
 from django_tables2 import SingleTableView
+from api.viewsets import is_regex
 from note.models import SpecialTransaction, NoteSpecial, Alias
 from note_kfet.settings.base import BASE_DIR
 from permission.backends import PermissionBackend
@@ -411,11 +412,16 @@ class SogeCreditListView(LoginRequiredMixin, ProtectQuerysetMixin, SingleTableVi
         if "search" in self.request.GET:
             pattern = self.request.GET["search"]
             if pattern:
+                # Check if this is a valid regex. If not, we won't check regex
+                valid_regex = is_regex(pattern)
+                suffix_alias = "__iregex" if valid_regex else "__icontains"
+                suffix = "__iregex" if valid_regex else "__istartswith"
+                prefix = "^" if valid_regex else ""
                 qs = qs.filter(
-                    Q(user__first_name__iregex=pattern)
-                    | Q(user__last_name__iregex=pattern)
-                    | Q(user__note__alias__name__iregex="^" + pattern)
-                    | Q(user__note__alias__normalized_name__iregex="^" + Alias.normalize(pattern))
+                    Q(**{f"user__first_name{suffix}": pattern})
+                    | Q(**{f"user__last_name{suffix}": pattern})
+                    | Q(**{f"user__note__alias__name{suffix_alias}": prefix + pattern})
+                    | Q(**{f"user__note__alias__normalized_name{suffix_alias}": prefix + Alias.normalize(pattern)})
                 )
 
         if "valid" not in self.request.GET or not self.request.GET["valid"]:

apps/wei/api/views.py

@@ -2,7 +2,8 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework.filters import OrderingFilter, SearchFilter
+from rest_framework.filters import OrderingFilter
+from api.filters import RegexSafeSearchFilter
 from api.viewsets import ReadProtectedModelViewSet
 
 from .serializers import WEIClubSerializer, BusSerializer, BusTeamSerializer, WEIRoleSerializer, \
@@ -18,7 +19,7 @@ class WEIClubViewSet(ReadProtectedModelViewSet):
     """
     queryset = WEIClub.objects.order_by('id')
     serializer_class = WEIClubSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['name', 'year', 'date_start', 'date_end', 'email', 'note__alias__name',
                         'note__alias__normalized_name', 'parent_club', 'parent_club__name', 'require_memberships',
                         'membership_fee_paid', 'membership_fee_unpaid', 'membership_duration', 'membership_start',
@@ -34,7 +35,7 @@ class BusViewSet(ReadProtectedModelViewSet):
     """
     queryset = Bus.objects.order_by('id')
     serializer_class = BusSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['name', 'wei', 'description', ]
     search_fields = ['$name', '$wei__name', '$description', ]
 
@@ -47,7 +48,7 @@ class BusTeamViewSet(ReadProtectedModelViewSet):
     """
     queryset = BusTeam.objects.order_by('id')
     serializer_class = BusTeamSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['name', 'bus', 'color', 'description', 'bus__wei', ]
     search_fields = ['$name', '$bus__name', '$bus__wei__name', '$description', ]
 
@@ -60,7 +61,7 @@ class WEIRoleViewSet(ReadProtectedModelViewSet):
     """
     queryset = WEIRole.objects.order_by('id')
     serializer_class = WEIRoleSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['name', 'permissions', 'memberships', ]
     search_fields = ['$name', ]
 
@@ -73,7 +74,7 @@ class WEIRegistrationViewSet(ReadProtectedModelViewSet):
     """
     queryset = WEIRegistration.objects.order_by('id')
     serializer_class = WEIRegistrationSerializer
-    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filter_backends = [DjangoFilterBackend, RegexSafeSearchFilter]
     filterset_fields = ['user', 'user__username', 'user__first_name', 'user__last_name', 'user__email',
                         'user__note__alias__name', 'user__note__alias__normalized_name', 'wei', 'wei__name',
                         'wei__email', 'wei__year', 'soge_credit', 'caution_check', 'birth_date', 'gender',
@@ -92,7 +93,7 @@ class WEIMembershipViewSet(ReadProtectedModelViewSet):
     """
     queryset = WEIMembership.objects.order_by('id')
     serializer_class = WEIMembershipSerializer
-    filter_backends = [DjangoFilterBackend, OrderingFilter, SearchFilter]
+    filter_backends = [DjangoFilterBackend, OrderingFilter, RegexSafeSearchFilter]
     filterset_fields = ['club__name', 'club__email', 'club__note__alias__name',
                         'club__note__alias__normalized_name', 'user__username', 'user__last_name',
                         'user__first_name', 'user__email', 'user__note__alias__name',

apps/wei/views.py

@@ -23,6 +23,7 @@ from django.views.generic import DetailView, UpdateView, RedirectView, TemplateV
 from django.utils.translation import gettext_lazy as _
 from django.views.generic.edit import BaseFormView, DeleteView
 from django_tables2 import SingleTableView
+from api.viewsets import is_regex
 from member.models import Membership, Club
 from note.models import Transaction, NoteClub, Alias, SpecialTransaction, NoteSpecial
 from note.tables import HistoryTable
@@ -219,13 +220,18 @@ class WEIMembershipsView(ProtectQuerysetMixin, LoginRequiredMixin, SingleTableVi
         if not pattern:
             return qs.none()
 
+        # Check if this is a valid regex. If not, we won't check regex
+        valid_regex = is_regex(pattern)
+        suffix_alias = "__iregex" if valid_regex else "__istartswith"
+        suffix = "__iregex" if valid_regex else "__icontains"
+        prefix = "^" if valid_regex else ""
         qs = qs.filter(
-            Q(user__first_name__iregex=pattern)
-            | Q(user__last_name__iregex=pattern)
-            | Q(user__note__alias__name__iregex="^" + pattern)
-            | Q(user__note__alias__normalized_name__iregex="^" + Alias.normalize(pattern))
-            | Q(bus__name__iregex=pattern)
-            | Q(team__name__iregex=pattern)
+            Q(**{f"user__first_name{suffix}": pattern})
+            | Q(**{f"user__last_name{suffix}": pattern})
+            | Q(**{f"user__note__alias__name{suffix_alias}": prefix + pattern})
+            | Q(**{f"user__note__alias__normalized_name{suffix_alias}": prefix + Alias.normalize(pattern)})
+            | Q(**{f"bus__name{suffix}": pattern})
+            | Q(**{f"team__name{suffix}": pattern})
         )
 
         return qs
@@ -255,11 +261,16 @@ class WEIRegistrationsView(ProtectQuerysetMixin, LoginRequiredMixin, SingleTable
         pattern = self.request.GET.get("search", "")
 
         if pattern:
+            # Check if this is a valid regex. If not, we won't check regex
+            valid_regex = is_regex(pattern)
+            suffix_alias = "__iregex" if valid_regex else "__istartswith"
+            suffix = "__iregex" if valid_regex else "__icontains"
+            prefix = "^" if valid_regex else ""
             qs = qs.filter(
-                Q(user__first_name__iregex=pattern)
-                | Q(user__last_name__iregex=pattern)
-                | Q(user__note__alias__name__iregex="^" + pattern)
-                | Q(user__note__alias__normalized_name__iregex="^" + Alias.normalize(pattern))
+                Q(**{f"user__first_name{suffix}": pattern})
+                | Q(**{f"user__last_name{suffix}": pattern})
+                | Q(**{f"user__note__alias__name{suffix_alias}": prefix + pattern})
+                | Q(**{f"user__note__alias__normalized_name{suffix_alias}": prefix + Alias.normalize(pattern)})
             )
 
         return qs