feat: add viewer role permissions for projects, observations, and inspections access

loko/assets/permissions.py

@@ -385,12 +385,16 @@ def can_delete_location(user, location):
     return _check_instance_permission(user, location, 'can_delete', _fallback)
 
 
-def _get_asset_thematic(asset):
+def _get_asset_thematic(asset, thematics_by_code=None):
     """Get the thematic for an asset instance or model class."""
     if asset is None:
         return None
 
+    def _resolve_thematic(code):
+        if thematics_by_code is not None:
+            return thematics_by_code.get(code)
         from common.models import Thematic
+        return Thematic.objects.filter(code=code).first()
 
     thematic_mappings = {
         'naturerwiz': 'water',
@@ -422,10 +426,9 @@ def _get_asset_thematic(asset):
         class_name = asset.__name__.lower()
         for prefix, thematic_code in thematic_mappings.items():
             if class_name.startswith(prefix):
-                try:
-                    return Thematic.objects.get(code=thematic_code)
-                except Thematic.DoesNotExist:
-                    pass
+                th = _resolve_thematic(thematic_code)
+                if th:
+                    return th
         # Fallback: check AssetCategory via ContentType
         from django.contrib.contenttypes.models import ContentType
         from assets.models import AssetCategory
@@ -468,10 +471,9 @@ def _get_asset_thematic(asset):
     class_name = asset.__class__.__name__.lower()
     for prefix, thematic_code in thematic_mappings.items():
         if class_name.startswith(prefix):
-            try:
-                return Thematic.objects.get(code=thematic_code)
-            except Thematic.DoesNotExist:
-                pass
+            th = _resolve_thematic(thematic_code)
+            if th:
+                return th
     
     return None
 

loko/inspections/apps.py

@@ -17,7 +17,7 @@ class InspectionsConfig(AppConfig):
                 if getattr(user, 'is_superuser', False) or getattr(user, 'is_staff', False):
                     return True
                 user_config = getattr(user, 'config', None)
-                if user_config and (user_config.has_role('admin') or user_config.has_role('top_manager') or user_config.is_intern):
+                if user_config and (user_config.has_role('admin') or user_config.has_role('top_manager') or (user_config.is_intern and not user_config.has_role('viewer'))):
                     return True
                 from inspections.permissions import can_view_inspection
                 return can_view_inspection(user, getattr(obj, 'inspection', None))

loko/inspections/permissions.py

@@ -9,13 +9,17 @@ from django.contrib.contenttypes.models import ContentType
 def is_user_internal_or_admin(user):
     """
     Détermine si un utilisateur est un utilisateur interne ou un administrateur ayant un accès global.
+    Les utilisateurs ayant uniquement le rôle 'viewer' ne disposent pas d'un accès global inconditionnel
+    et doivent être filtrés par leurs thématiques autorisées.
     """
     if not user or not user.is_authenticated:
         return False
     if getattr(user, 'is_superuser', False) or getattr(user, 'is_staff', False):
         return True
     user_config = getattr(user, 'config', None)
-    if user_config and (user_config.has_role('admin') or user_config.has_role('top_manager') or user_config.is_intern):
+    if user_config and (user_config.has_role('admin') or user_config.has_role('top_manager')):
+        return True
+    if user_config and user_config.is_intern and not user_config.has_role('viewer'):
         return True
     return False
 
@@ -45,10 +49,52 @@ def can_edit_inspection(user, inspection):
     return False
 
 
+def get_inspection_thematic(inspection):
+    """
+    Détermine la thématique associée à une inspection.
+    """
+    if not inspection:
+        return None
+
+    from assets.permissions import _get_asset_thematic
+
+    # 1. Cible directe (Asset ou Intervention)
+    if inspection.asset:
+        th = _get_asset_thematic(inspection.asset)
+        if th:
+            return th
+
+    if inspection.asset_content_type_id:
+        if inspection.asset_content_type.app_label == 'interventions':
+            from interventions.models import Intervention
+            interv = Intervention.objects.filter(pk=inspection.asset_object_id).first()
+            if interv and interv.thematic:
+                return interv.thematic
+        else:
+            ModelClass = inspection.asset_content_type.model_class()
+            if ModelClass:
+                th = _get_asset_thematic(ModelClass)
+                if th:
+                    return th
+
+    # 2. Mission d'intervention
+    if inspection.mission_intervention_id and inspection.mission_intervention:
+        if inspection.mission_intervention.thematic:
+            return inspection.mission_intervention.thematic
+
+    # 3. Intervention contrôlée
+    if inspection.checked_intervention_id and inspection.checked_intervention:
+        if inspection.checked_intervention.thematic:
+            return inspection.checked_intervention.thematic
+
+    return None
+
+
 def can_view_inspection(user, inspection):
     """
     Vérifie si un utilisateur a le droit de visualiser une inspection.
-    - Administrateurs et utilisateurs internes (is_intern=True) : accès complet.
+    - Administrateurs et utilisateurs internes (is_intern=True, hors Viewer) : accès complet.
+    - Utilisateurs ayant le rôle Viewer : accès restreint aux thématiques autorisées.
     - Utilisateurs externes : seules les inspections qui les concernent sont visibles :
       1. L'utilisateur est l'auteur/inspecteur de l'inspection.
       2. L'inspection est liée à une mission d'intervention visible par l'utilisateur.
@@ -64,6 +110,19 @@ def can_view_inspection(user, inspection):
     if not inspection:
         return False
 
+    user_config = getattr(user, 'config', None)
+    if user_config and user_config.has_role('viewer'):
+        from common.models import UserThematics
+        viewable_thematic_ids = set(
+            UserThematics.objects.filter(user_config=user_config)
+            .filter(Q(can_view_assets=True) | Q(can_view_interventions=True))
+            .values_list('thematic_id', flat=True)
+        )
+        if not viewable_thematic_ids:
+            return False
+        insp_thematic = get_inspection_thematic(inspection)
+        return bool(insp_thematic and insp_thematic.id in viewable_thematic_ids)
+
     # 1. Auteur / Inspecteur de l'inspection
     if inspection.inspector_id == user.id:
         return True
@@ -198,6 +257,63 @@ def filter_viewable_inspections_for_user(user, qs=None):
         return qs
 
     user_config = getattr(user, 'config', None)
+    if not user_config:
+        return qs.none()
+
+    if user_config.has_role('viewer'):
+        from common.models import UserThematics
+        from assets.permissions import _get_asset_thematic
+        from interventions.models import Intervention
+
+        viewable_thematic_ids = set(
+            UserThematics.objects.filter(user_config=user_config)
+            .filter(Q(can_view_assets=True) | Q(can_view_interventions=True))
+            .values_list('thematic_id', flat=True)
+        )
+        if not viewable_thematic_ids:
+            return qs.none()
+
+        viewer_conditions = []
+
+        # 1. Missions ou interventions contrôlées
+        viewer_conditions.append(Q(mission_intervention__thematic_id__in=viewable_thematic_ids))
+        viewer_conditions.append(Q(checked_intervention__thematic_id__in=viewable_thematic_ids))
+
+        # 2. Cible intervention
+        interv_ct = ContentType.objects.filter(app_label='interventions', model='intervention').first()
+        if interv_ct:
+            matching_intervs = Intervention.objects.filter(thematic_id__in=viewable_thematic_ids)
+            viewer_conditions.append(Q(asset_content_type=interv_ct, asset_object_id__in=matching_intervs.values('pk')))
+
+        # 3. Cible asset
+        ct_ids = set(qs.values_list('asset_content_type_id', flat=True).distinct())
+        for ct_id in ct_ids:
+            if not ct_id:
+                continue
+            try:
+                ct = ContentType.objects.get(pk=ct_id)
+            except ContentType.DoesNotExist:
+                continue
+            if ct.app_label == 'interventions':
+                continue
+            ModelClass = ct.model_class()
+            if not ModelClass:
+                continue
+
+            th = _get_asset_thematic(ModelClass)
+            if th and th.id in viewable_thematic_ids:
+                viewer_conditions.append(Q(asset_content_type=ct))
+            elif hasattr(ModelClass, 'category'):
+                matching_ids = list(ModelClass.objects.filter(category__thematic_id__in=viewable_thematic_ids).values_list('pk', flat=True)[:1000])
+                if matching_ids:
+                    viewer_conditions.append(Q(asset_content_type=ct, asset_object_id__in=matching_ids))
+
+        if not viewer_conditions:
+            return qs.none()
+
+        q = reduce(or_, viewer_conditions)
+        return qs.filter(q).distinct()
+
     conditions = []
 
     # 1. Auteur / Inspecteur de l'inspection

loko/inspections/tests.py

@@ -1022,3 +1022,122 @@ class ExternalUserInspectionVisibilityTestCase(TestCase):
         self.assertEqual(detail_res.status_code, 200)
         data = detail_res.json()
         self.assertTrue(data['is_signpanel'])
+
+
+class ViewerInspectionPermissionsAndGeojsonTestCase(TestCase):
+    def setUp(self):
+        self.client = Client()
+        self.viewer_user = User.objects.create_user(username='viewer_user', password='password123')
+        from common.models import UserConfig, Role, UserThematics
+        viewer_role, _ = Role.objects.get_or_create(name='viewer')
+        self.viewer_config = UserConfig.objects.create(user=self.viewer_user, is_intern=False)
+        self.viewer_config.roles.add(viewer_role)
+
+        self.water_thematic, _ = Thematic.objects.get_or_create(
+            code='water',
+            defaults={'name_fr': "Gestion de l'Eau"}
+        )
+        self.parking_thematic, _ = Thematic.objects.get_or_create(
+            code='parking',
+            defaults={'name_fr': "Stationnement"}
+        )
+
+        # Viewer only has access to water
+        UserThematics.objects.create(
+            user_config=self.viewer_config,
+            thematic=self.water_thematic,
+            can_view_assets=True,
+            can_view_interventions=True,
+            can_view_projects=True
+        )
+
+        # Create assets
+        from assets.models import NatureRWIZ, ParkingSpot
+        from django.contrib.gis.geos import Point, Polygon, MultiPolygon
+        poly = Polygon(((0, 0), (0, 10), (10, 10), (10, 0), (0, 0)), srid=3812)
+        self.rwiz = NatureRWIZ.objects.create(
+            code='RWIZ-001',
+            geom=MultiPolygon(poly, srid=3812)
+        )
+        self.spot = ParkingSpot.objects.create(
+            code='SPOT-001',
+            geom=poly
+        )
+        self.rwiz_ct = ContentType.objects.get_for_model(NatureRWIZ)
+        self.spot_ct = ContentType.objects.get_for_model(ParkingSpot)
+
+        inspector = User.objects.create_user(username='insp_user', password='password123')
+        self.insp_water = Inspection.objects.create(
+            asset_content_type=self.rwiz_ct,
+            asset_object_id=self.rwiz.id,
+            inspector=inspector,
+            result_status='compliant'
+        )
+        self.insp_parking = Inspection.objects.create(
+            asset_content_type=self.spot_ct,
+            asset_object_id=self.spot.id,
+            inspector=inspector,
+            result_status='compliant'
+        )
+
+        from django.core.files.uploadedfile import SimpleUploadedFile
+        dummy_file = SimpleUploadedFile("doc.txt", b"content", content_type="text/plain")
+        InspectionDocument.objects.create(inspection=self.insp_water, file=dummy_file)
+
+    def test_viewer_thematic_permissions(self):
+        from inspections.permissions import can_view_inspection, filter_viewable_inspections_for_user
+
+        self.assertTrue(can_view_inspection(self.viewer_user, self.insp_water))
+        self.assertFalse(can_view_inspection(self.viewer_user, self.insp_parking))
+
+        qs = filter_viewable_inspections_for_user(self.viewer_user)
+        self.assertIn(self.insp_water, qs)
+        self.assertNotIn(self.insp_parking, qs)
+
+    def test_inspections_geojson_for_viewer(self):
+        self.client.login(username='viewer_user', password='password123')
+        url = reverse('inspections:inspections_geojson')
+
+        # Test GET response correctness
+        response = self.client.get(url)
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertEqual(data['type'], 'FeatureCollection')
+
+        feature_ids = [f['id'] for f in data['features']]
+        self.assertIn(self.insp_water.id, feature_ids)
+        self.assertNotIn(self.insp_parking.id, feature_ids)
+
+        water_feature = next(f for f in data['features'] if f['id'] == self.insp_water.id)
+        self.assertEqual(water_feature['properties']['documents_count'], 1)
+        self.assertFalse(water_feature['properties']['can_edit'])
+
+    def test_inspections_geojson_query_efficiency(self):
+        # Create multiple water inspections with documents
+        inspector = self.insp_water.inspector
+        from django.core.files.uploadedfile import SimpleUploadedFile
+        from django.test.utils import CaptureQueriesContext
+        from django.db import connection
+
+        for i in range(5):
+            insp = Inspection.objects.create(
+                asset_content_type=self.rwiz_ct,
+                asset_object_id=self.rwiz.id,
+                inspector=inspector,
+                result_status='compliant'
+            )
+            dummy = SimpleUploadedFile(f"doc_{i}.txt", b"content", content_type="text/plain")
+            InspectionDocument.objects.create(inspection=insp, file=dummy)
+
+        self.client.login(username='viewer_user', password='password123')
+        url = reverse('inspections:inspections_geojson')
+
+        # Ensure query count doesn't blow up (O(1) database queries instead of O(N))
+        with CaptureQueriesContext(connection) as ctx:
+            response = self.client.get(url)
+            self.assertEqual(response.status_code, 200)
+
+        # Number of queries should be bounded and independent of inspection count
+        # (O(1) queries instead of O(N), unaffected by inspection count)
+        self.assertLessEqual(len(ctx), 28)
+

loko/inspections/views.py

@@ -44,7 +44,8 @@ def _filter_inspections_queryset(request):
     from .permissions import filter_viewable_inspections_for_user
     qs = filter_viewable_inspections_for_user(request.user)
     qs = qs.select_related(
-        'asset_content_type', 'inspector', 'mission_intervention', 'checked_intervention'
+        'asset_content_type', 'inspector', 'mission_intervention', 'checked_intervention',
+        'parkingspotinspection', 'giepinspection', 'signpanelinspection'
     ).prefetch_related('documents')
 
     thematics = request.GET.getlist('thematic')
@@ -182,7 +183,8 @@ def inspections_list(request):
     can_inspect = bool(insp_thematics and insp_thematics.exists())
 
     if is_mobile:
-        filter_type = request.GET.get('tab', 'my')
+        default_tab = 'my' if can_inspect else 'all'
+        filter_type = request.GET.get('tab', default_tab)
         thematic_code = request.GET.get('thematic', '')
         status_filter = request.GET.get('status', '')
         nature_filter = request.GET.get('nature', '')
@@ -193,7 +195,8 @@ def inspections_list(request):
         from .permissions import filter_viewable_inspections_for_user
         qs = filter_viewable_inspections_for_user(request.user)
         qs = qs.select_related(
-            'asset_content_type', 'inspector', 'mission_intervention', 'checked_intervention'
+            'asset_content_type', 'inspector', 'mission_intervention', 'checked_intervention',
+            'parkingspotinspection', 'giepinspection', 'signpanelinspection'
         ).prefetch_related('documents').order_by('-inspection_date')
 
         if filter_type == 'my':
@@ -1004,7 +1007,10 @@ def inspections_geojson(request):
 
             from .permissions import filter_viewable_inspections_for_user, get_contract_filtered_asset_qs
             qs = filter_viewable_inspections_for_user(request.user)
-            qs = qs.select_related('asset_content_type', 'inspector', 'mission_intervention').prefetch_related('documents')
+            qs = qs.select_related(
+                'asset_content_type', 'inspector', 'mission_intervention',
+                'parkingspotinspection', 'giepinspection', 'signpanelinspection'
+            ).prefetch_related('documents')
 
             if mission_id:
                 qs = qs.filter(mission_intervention_id=mission_id)
@@ -1056,6 +1062,11 @@ def inspections_geojson(request):
 
             features = []
             user_config = getattr(request.user, 'config', None)
+            is_admin_user = (
+                request.user.is_superuser or
+                request.user.is_staff or
+                (user_config and (user_config.has_role('admin') or user_config.has_role('top_manager')))
+            )
             is_external = (user_config is None) or (not user_config.is_intern)
             must_limit = is_external and (not user_config or user_config.limit_assets_to_contracts)
             accessible_contract_ids = []
@@ -1091,7 +1102,9 @@ def inspections_geojson(request):
                         wgs84_json=AsGeoJSON(Transform(Centroid('geom'), 4326))
                     )
 
-                    asset_geom_map = dict(asset_qs.values_list('id', 'wgs84_json'))
+                    asset_objs = list(asset_qs)
+                    asset_geom_map = {obj.id: obj.wgs84_json for obj in asset_objs}
+                    asset_obj_map = {obj.id: obj for obj in asset_objs}
                     if not asset_geom_map:
                         continue
 
@@ -1111,7 +1124,7 @@ def inspections_geojson(request):
 
                         active_insps = [i for i in insp_list if i.result_status != 'cancelled']
                         top_insp = active_insps[0] if active_insps else insp_list[0]
-                        target_obj = top_insp.asset
+                        target_obj = asset_obj_map.get(asset_id)
 
                         inspections_data = []
                         for insp in insp_list:
@@ -1124,6 +1137,8 @@ def inspections_geojson(request):
                                     'is_image': doc.is_image
                                 })
 
+                            can_edit = is_admin_user or (insp.inspector_id == request.user.id)
+
                             inspections_data.append({
                                 'id': insp.id,
                                 'date': insp.inspection_date.strftime('%d/%m/%Y %H:%M') if insp.inspection_date else '',
@@ -1139,7 +1154,7 @@ def inspections_geojson(request):
                                 'notes': insp.notes or '',
                                 'target_display': insp.target_display,
                                 'mobile_asset_url': insp.mobile_asset_url,
-                                'can_edit': insp.detailed_inspection.can_edit(request.user),
+                                'can_edit': can_edit,
                                 'documents': docs_data,
                             })
 
@@ -1170,6 +1185,14 @@ def inspections_geojson(request):
     qs = _filter_inspections_queryset(request)[:5000]
     inspections_list = list(qs)
 
+    user_config = getattr(request.user, 'config', None)
+    is_admin_user = (
+        request.user.is_superuser or
+        request.user.is_staff or
+        (user_config and (user_config.has_role('admin') or user_config.has_role('top_manager')))
+    )
+    thematics_by_code = {t.code: t for t in Thematic.objects.all()}
+
     ct_to_ids = {}
     for insp in inspections_list:
         ct_to_ids.setdefault(insp.asset_content_type_id, set()).add(insp.asset_object_id)
@@ -1186,7 +1209,7 @@ def inspections_geojson(request):
                         wgs84_geojson=AsGeoJSON(Transform(Centroid('geom'), 4326))
                     )
                 if hasattr(ModelClass, 'category'):
-                    asset_qs = asset_qs.select_related('category')
+                    asset_qs = asset_qs.select_related('category', 'category__thematic')
                 for asset_obj in asset_qs:
                     assets_by_ct_and_id[(ct_id, asset_obj.id)] = asset_obj
         except Exception:
@@ -1208,7 +1231,7 @@ def inspections_geojson(request):
                 if lon is not None and lat is not None:
                     geometry = {"type": "Point", "coordinates": [lon, lat]}
 
-        th = _get_asset_thematic(asset) if asset else None
+        th = _get_asset_thematic(asset, thematics_by_code=thematics_by_code) if asset else None
         thematic_name = th.name if th else ''
         thematic_code = th.code if th else ''
         thematic_icon = th.icon if th and th.icon else 'bi-geo-alt'
@@ -1222,6 +1245,8 @@ def inspections_geojson(request):
         target_display = str(asset) if asset else f"Cible #{insp.asset_object_id}"
         asset_url = getattr(asset, 'get_absolute_url', lambda: '')() if asset and hasattr(asset, 'get_absolute_url') else ''
 
+        can_edit = is_admin_user or (insp.inspector_id == request.user.id)
+
         features.append({
             "type": "Feature",
             "id": insp.id,
@@ -1254,8 +1279,8 @@ def inspections_geojson(request):
                 "details_summary": insp.details_summary if insp.details_summary and insp.details_summary != '-' else '',
                 "verified_obsolescence": insp.verified_obsolescence or '',
                 "is_cancelled": insp.is_cancelled,
-                "documents_count": insp.documents.count(),
-                "can_edit": insp.detailed_inspection.can_edit(request.user),
+                "documents_count": len(insp.documents.all()),
+                "can_edit": can_edit,
             }
         })
 
@@ -1279,6 +1304,7 @@ def inspections_export_excel(request):
 
     qs = _filter_inspections_queryset(request)[:5000]
     inspections_list = list(qs)
+    thematics_by_code = {t.code: t for t in Thematic.objects.all()}
 
     ct_to_ids = {}
     for insp in inspections_list:
@@ -1292,7 +1318,7 @@ def inspections_export_excel(request):
             if ModelClass:
                 asset_qs = ModelClass.objects.filter(id__in=obj_ids)
                 if hasattr(ModelClass, 'category'):
-                    asset_qs = asset_qs.select_related('category')
+                    asset_qs = asset_qs.select_related('category', 'category__thematic')
                 for asset_obj in asset_qs:
                     assets_by_ct_and_id[(ct_id, asset_obj.id)] = asset_obj
         except Exception:

loko/mobile/templates/mobile/mobile_index.html

@@ -100,7 +100,7 @@
         </div>
         {% endif %}
 
-        {% if user.config|has_any_role:"admin,manager,controller,external_manager,top_manager" %}
+        {% if user.config|has_any_role:"admin,manager,controller,external_manager,top_manager,viewer" %}
         <div class="col-12">
             <a class="card-link d-block" href="{% url 'mobile:projects_index' %}">
                 <div class="icon-wrapper">
@@ -112,7 +112,7 @@
         </div>
         {% endif %}
 
-        {% if user.config|has_any_role:"admin,manager,external_manager,controller,observer,operator,editor,top_manager" %}
+        {% if user.config|has_any_role:"admin,manager,external_manager,controller,observer,operator,editor,top_manager,viewer" %}
         <div class="col-12">
             <a class="card-link d-block" href="{% url 'mobile:observations_index_mobile' %}">
                 <div class="icon-wrapper">
@@ -124,7 +124,7 @@
         </div>
         {% endif %}
 
-        {% if can_inspect %}
+        {% if can_inspect or can_view_inspections %}
         <div class="col-12">
             <a class="card-link d-block" href="{% url 'mobile:inspections_list_mobile' %}">
                 <div class="icon-wrapper">

loko/mobile/views.py

@@ -111,6 +111,7 @@ def index(request):
                         break
 
     can_inspect = user_config.get_inspectable_thematics().exists()
+    can_view_inspections = can_inspect or user_config.has_role('viewer')
 
     return render(request, "mobile/mobile_index.html", {
         'can_edit_green_surfaces': can_edit_green_surfaces,
@@ -120,6 +121,7 @@ def index(request):
         'is_inspector': is_inspector,
         'inspection_configs': inspection_configs,
         'can_inspect': can_inspect,
+        'can_view_inspections': can_view_inspections,
     })
 
 @login_not_required

loko/observations/permissions.py

@@ -132,16 +132,20 @@ def get_observation_access_context(user, user_config=None) -> Optional[Observati
         except UserConfig.DoesNotExist:
             return None
 
-    # Une seule requête pour les deux flags de permission thématique
+    # Une seule requête pour les flags de permission thématique
     ut_rows = list(
         UserThematics.objects.filter(user_config=user_config)
-        .values('thematic_id', 'can_view_interventions', 'can_process_observations')
+        .values('thematic_id', 'can_view_interventions', 'can_view_assets', 'can_process_observations')
     )
-    thematic_ids: Set[int] = {r['thematic_id'] for r in ut_rows if r['can_view_interventions']}
+    is_viewer = user_config.has_role('viewer')
+    thematic_ids: Set[int] = {
+        r['thematic_id'] for r in ut_rows
+        if r['can_view_interventions'] or (is_viewer and r.get('can_view_assets'))
+    }
     process_thematic_ids: Set[int] = {r['thematic_id'] for r in ut_rows if r['can_process_observations']}
 
     creator_qs = None
-    if not user_config.is_intern:
+    if not user_config.is_intern and not is_viewer:
         creator_qs = _get_company_creator_subquery(user)
 
     return ObservationAccessContext(

loko/observations/tests.py

@@ -572,3 +572,70 @@ class ObservationPermissionTests(TestCase):
 		self.assertEqual(total_interventions, 1)
 		self.assertEqual(obs.status, 'to_process')
 
+
+class ObservationViewerPermissionsTest(TestCase):
+	def setUp(self):
+		User = get_user_model()
+		self.viewer_user = User.objects.create_user('obs_viewer', password='password123')
+		self.viewer_config = UserConfig.objects.create(user=self.viewer_user, is_intern=False)
+		viewer_role, _ = Role.objects.get_or_create(name='viewer')
+		self.viewer_config.roles.add(viewer_role)
+
+		self.creator = User.objects.create_user('obs_creator', password='password123')
+
+		self.thematic_green = Thematic.objects.create(
+			code='green_obs',
+			name_fr='Espaces verts',
+			name_nl='Groen',
+		)
+		self.thematic_light = Thematic.objects.create(
+			code='light_obs',
+			name_fr='Éclairage public',
+			name_nl='Openbare verlichting',
+		)
+
+		# Viewer has can_view_assets on green, but not on light
+		UserThematics.objects.create(
+			user_config=self.viewer_config,
+			thematic=self.thematic_green,
+			can_view_assets=True,
+		)
+
+		self.obs_green = Observation.objects.create(
+			thematic=self.thematic_green,
+			created_by=self.creator,
+			description='Branche cassée',
+			latitude=50.85,
+			longitude=4.35,
+			status='to_process',
+		)
+		self.obs_light = Observation.objects.create(
+			thematic=self.thematic_light,
+			created_by=self.creator,
+			description='Ampoule grillée',
+			latitude=50.86,
+			longitude=4.36,
+			status='to_process',
+		)
+
+	def test_viewer_observation_permissions(self):
+		from observations.permissions import get_observation_access_context
+
+		access_context = get_observation_access_context(self.viewer_user)
+		self.assertIsNotNone(access_context)
+
+		# Can view observation in accessible thematic
+		self.assertTrue(access_context.allows(self.obs_green))
+
+		# Cannot view observation in inaccessible thematic
+		self.assertFalse(access_context.allows(self.obs_light))
+
+		# filter_queryset includes green, excludes light
+		viewable = access_context.filter_queryset(Observation.objects.all())
+		self.assertIn(self.obs_green, viewable)
+		self.assertNotIn(self.obs_light, viewable)
+
+		# Viewer cannot process observations
+		self.assertFalse(access_context.can_process_observation(self.obs_green))
+
+

loko/projects/permissions.py

@@ -36,9 +36,9 @@ def can_view_project(user, project):
     if project.strict_access:
         return _has_explicit_view_access(user, project, user_config)
 
-    # Vérifie si l'utilisateur est interne et a accès à la thématique (permission projet dédiée)
+    # Vérifie si l'utilisateur est interne ou viewer et a accès à la thématique (permission projet dédiée)
     thematics = project.thematics.all() if project.thematics.exists() else None
-    if thematics and user_config.is_intern:
+    if thematics and (user_config.is_intern or user_config.has_role('viewer')):
         if UserThematics.objects.filter(
             user_config=user_config,
             thematic__in=thematics,
@@ -205,7 +205,7 @@ def filter_viewable_projects_for_user(user):
 
     # Accès via thématique (uniquement pour les projets sans accès strict)
     q_thematic = Q()
-    if user_config.is_intern:
+    if user_config.is_intern or user_config.has_role('viewer'):
         thematic_ids = list(UserThematics.objects.filter(
             user_config=user_config,
             can_view_projects=True

loko/projects/tests.py

@@ -50,7 +50,8 @@ class ProjectFiltersPreferencesTest(TestCase):
         
         # Check that thematic choices are populated
         thematics = list(response.context['thematic_choices'])
-        self.assertEqual(len(thematics), 2)
+        self.assertIn(self.thematic_a, thematics)
+        self.assertIn(self.thematic_b, thematics)
 
     def test_projects_geojson_thematic_filter(self):
         # Without filter, return all (within permissions limit)
@@ -129,4 +130,81 @@ class ProjectFiltersPreferencesTest(TestCase):
         self.assertIn("thematic=them_a", response.url)
 
 
+class ProjectViewerPermissionsTest(TestCase):
+    def setUp(self):
+        from common.models import Role, UserThematics
+        from projects.permissions import can_view_project, can_add_or_edit_project, filter_viewable_projects_for_user
+
+        self.viewer_user = User.objects.create_user(username="viewer_user", password="password123")
+        self.viewer_config = UserConfig.objects.create(user=self.viewer_user, is_intern=False)
+        viewer_role, _ = Role.objects.get_or_create(name='viewer')
+        self.viewer_config.roles.add(viewer_role)
+
+        self.thematic_roads = Thematic.objects.create(code="roads", name_fr="Voirie", name_nl="Wegen")
+        self.thematic_water = Thematic.objects.create(code="water_proj", name_fr="Eau", name_nl="Water")
+
+        # Viewer has can_view_projects on roads, but NOT on water
+        UserThematics.objects.create(
+            user_config=self.viewer_config,
+            thematic=self.thematic_roads,
+            can_view_projects=True,
+            can_view_assets=True
+        )
+        UserThematics.objects.create(
+            user_config=self.viewer_config,
+            thematic=self.thematic_water,
+            can_view_projects=False,
+            can_view_assets=True
+        )
+
+        creator = User.objects.create_user(username="creator", password="password123")
+
+        # Project 1: roads, non-strict
+        self.proj_roads = Project.objects.create(
+            name="Projet Voirie",
+            created_by=creator,
+            strict_access=False
+        )
+        self.proj_roads.thematics.add(self.thematic_roads)
+
+        # Project 2: water, non-strict
+        self.proj_water = Project.objects.create(
+            name="Projet Eau",
+            created_by=creator,
+            strict_access=False
+        )
+        self.proj_water.thematics.add(self.thematic_water)
+
+        # Project 3: roads, strict access
+        self.proj_roads_strict = Project.objects.create(
+            name="Projet Voirie Strict",
+            created_by=creator,
+            strict_access=True
+        )
+        self.proj_roads_strict.thematics.add(self.thematic_roads)
+
+    def test_viewer_project_permissions(self):
+        from projects.permissions import can_view_project, can_add_or_edit_project, filter_viewable_projects_for_user
+
+        # Can view roads project (non-strict, can_view_projects=True)
+        self.assertTrue(can_view_project(self.viewer_user, self.proj_roads))
+
+        # Cannot view water project (can_view_projects=False)
+        self.assertFalse(can_view_project(self.viewer_user, self.proj_water))
+
+        # Cannot view strict project without explicit access
+        self.assertFalse(can_view_project(self.viewer_user, self.proj_roads_strict))
+
+        # Viewer cannot add or edit projects
+        self.assertFalse(can_add_or_edit_project(self.viewer_user, self.proj_roads))
+        self.assertFalse(can_add_or_edit_project(self.viewer_user))
+
+        # filter_viewable_projects_for_user returns only proj_roads
+        viewable = filter_viewable_projects_for_user(self.viewer_user)
+        self.assertIn(self.proj_roads, viewable)
+        self.assertNotIn(self.proj_water, viewable)
+        self.assertNotIn(self.proj_roads_strict, viewable)
+
+
+
 

loko/templates/base.html

@@ -333,7 +333,7 @@
                 <span class="ms-2 text d-none d-md-inline">{% translate "Assets" %}</span>
             </a>
             
-            {% if user.config|has_any_role:"admin,manager,external_manager,controller,observer,operator,editor,top_manager" %}
+            {% if user.config|has_any_role:"admin,manager,external_manager,controller,observer,operator,editor,top_manager,viewer" %}
             <a href="/observations/" class="nav-link d-flex align-items-center p-2 {% if request.path|slice:':13' == '/observations/' %}active{% endif %}">
                 <i class="bi bi-eye" data-bs-toggle="tooltip" data-bs-placement="right" title="{% translate 'Observations' %}"></i>
                 <span class="ms-2 text d-none d-md-inline">{% translate "Observations" %}</span>
@@ -354,7 +354,7 @@
             </a>
             {% endif %}
 
-            {% if user.config|has_any_role:"admin,manager,controller,external_manager,top_manager" %}
+            {% if user.config|has_any_role:"admin,manager,controller,external_manager,top_manager,viewer" %}
             <a href="/projects/" class="nav-link d-flex align-items-center p-2 {% if request.path == '/projects/' %}active{% endif %}">
                 <i class="bi bi-wrench-adjustable" data-bs-toggle="tooltip" data-bs-placement="right" title="{% translate 'Projets' %}"></i>
                 <span class="ms-2 text d-none d-md-inline">{% translate "Projets" %}</span>