Add authenticated device registration for USB intake

inventory/api.py

@@ -1,6 +1,8 @@
 from __future__ import annotations
 
 from collections.abc import Mapping
+import hashlib
+import json
 
 from django.core.exceptions import ValidationError as DjangoValidationError
 from django.db import transaction
@@ -9,9 +11,9 @@ from rest_framework import generics, serializers, status
 from rest_framework.response import Response
 from rest_framework.views import APIView
 
-from .models import ChoiceValue, Device, Employee
+from .models import AuditLog, ChoiceValue, Device, DeviceRegistration, Employee, NumberSequence
 from .query import SPECIFICATION_RELATIONS
-from .services import update_device_field
+from .services import add_audit, update_device_field
 
 
 class SecureAPIResponseMixin:
@@ -121,6 +123,16 @@ class DeviceChangesSerializer(StrictSerializer):
         return attrs
 
 
+class DeviceCreateSerializer(DeviceChangesSerializer):
+    request_id = serializers.UUIDField()
+    status = serializers.PrimaryKeyRelatedField(
+        queryset=ChoiceValue.objects.filter(kind=ChoiceValue.Kind.STATUS, active=True),
+    )
+    device_type = serializers.PrimaryKeyRelatedField(
+        queryset=ChoiceValue.objects.filter(kind=ChoiceValue.Kind.DEVICE_TYPE, active=True),
+    )
+
+
 class DevicePatchSerializer(DeviceChangesSerializer):
     expected_updated_at = serializers.DateTimeField(required=False, write_only=True)
     expected_revision = serializers.IntegerField(required=False, min_value=1, write_only=True)
@@ -169,6 +181,29 @@ def apply_changes(device, changes, *, user, api_client, expected_updated_at=None
 class DeviceListView(SecureAPIResponseMixin, generics.ListAPIView):
     serializer_class = DeviceSerializer
 
+    @transaction.atomic
+    def post(self, request):
+        serializer = DeviceCreateSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        values = dict(serializer.validated_data)
+        request_id = values.pop("request_id")
+        digest = hashlib.sha256(json.dumps(request.data, sort_keys=True, separators=(",", ":")).encode()).hexdigest()
+        # Share the existing allocation lock, including across simultaneous retries.
+        NumberSequence.objects.select_for_update().get_or_create(name="device")
+        previous = DeviceRegistration.objects.select_related("device").filter(request_id=request_id).first()
+        if previous:
+            if previous.payload_hash != digest:
+                return Response({"detail": "request_id wurde bereits für andere Daten verwendet."}, status=409)
+            return Response(DeviceSerializer(previous.device).data, status=200)
+        try:
+            device = Device.objects.create(**values)
+        except DjangoValidationError as exc:
+            raise serializers.ValidationError(exc.messages)
+        DeviceRegistration.objects.create(request_id=request_id, payload_hash=digest, device=device)
+        add_audit(request.user, device, AuditLog.Action.CREATE,
+                  new=f"Gerät #{device.number}", api_client=request.auth.name)
+        return Response(DeviceSerializer(device).data, status=201)
+
     def get_queryset(self):
         queryset = Device.objects.select_related(
             "status", "recipient", "location", "device_type", "employee",

inventory/migrations/0013_deviceregistration.py

@@ -0,0 +1,28 @@
+# Generated by Django 5.2.18 on 2026-10-11 19:55
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('inventory', '0012_allinonespecification_desktopspecification_and_more'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='DeviceRegistration',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('request_id', models.UUIDField(unique=True)),
+                ('payload_hash', models.CharField(max_length=64)),
+                ('device', models.OneToOneField(on_delete=django.db.models.deletion.PROTECT, related_name='registration', to='inventory.device')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]

inventory/models.py

@@ -102,6 +102,14 @@ class FieldDefinition(TimeStampedModel):
         return self.name
 
 
+class DeviceRegistration(TimeStampedModel):
+    """Durable receipt so retrying a USB report cannot allocate another device."""
+
+    request_id = models.UUIDField(unique=True)
+    payload_hash = models.CharField(max_length=64)
+    device = models.OneToOneField("Device", on_delete=models.PROTECT, related_name="registration")
+
+
 class FieldOption(TimeStampedModel):
     field = models.ForeignKey(FieldDefinition, on_delete=models.CASCADE, related_name="options")
     label = models.CharField(max_length=120)

inventory/test_usb_intake.py

@@ -0,0 +1,120 @@
+import json
+import uuid
+from datetime import timedelta
+from concurrent.futures import ThreadPoolExecutor
+from threading import Barrier
+from unittest.mock import patch
+
+from django.contrib.auth.models import User
+from django.db import close_old_connections
+from django.test import Client, TestCase, TransactionTestCase, skipUnlessDBFeature
+from django.urls import reverse
+from django.utils import timezone
+
+from .models import AuditLog, ChoiceValue, Device, DeviceRegistration, InventoryAPIKey, NumberSequence
+
+
+class RegistrationTests(TestCase):
+    def setUp(self):
+        self.user = User.objects.create_user('usb-operator', is_superuser=True)
+        self.status = ChoiceValue.objects.create(kind='status', label='Neu')
+        self.kind = ChoiceValue.objects.create(kind='device_type', label='Laptop')
+        _, self.key = InventoryAPIKey.objects.create_key(
+            name='usb-intake', service_user=self.user, can_read=True, can_write=True,
+            expiry_date=timezone.now() + timedelta(days=1))
+        self.payload = {'request_id': str(uuid.uuid4()), 'status': self.status.pk,
+                        'device_type': self.kind.pk, 'cpu': 'Test CPU', 'ram_gb': 16,
+                        'hwid': str(uuid.uuid4()), 'comment': 'CPU/RAM: PASS'}
+
+    def post(self, payload=None, key=None):
+        return self.client.post(reverse('inventory-api:device-list'),
+                                json.dumps(self.payload if payload is None else payload),
+                                content_type='application/json',
+                                HTTP_AUTHORIZATION=f'Api-Key {key or self.key}')
+
+    def test_create_specs_audit_and_retry(self):
+        NumberSequence.objects.update_or_create(name='device', defaults={'last_value': 42})
+        response = self.post()
+        self.assertEqual(response.status_code, 201, response.content)
+        device = Device.objects.get()
+        self.assertEqual(device.number, 43)
+        self.assertEqual(device.ram_gb, 16)
+        self.assertEqual(device.stage, Device.Stage.INTAKE)
+        self.assertIsNone(device.ssd_gb)
+        self.assertEqual(device.wifi, 'UNKNOWN')
+        audit = AuditLog.objects.get(device=device)
+        self.assertEqual(audit.api_client, 'usb-intake')
+        self.assertEqual(audit.user, self.user)
+        self.assertEqual(audit.action, AuditLog.Action.CREATE)
+        retry = self.post()
+        self.assertEqual(retry.status_code, 200)
+        self.assertEqual(retry.json()['number'], device.number)
+        self.assertEqual(Device.objects.count(), 1)
+        self.assertEqual(AuditLog.objects.count(), 1)
+
+    def test_changed_retry_conflicts(self):
+        self.post()
+        self.assertEqual(self.post({**self.payload, 'ram_gb': 32}).status_code, 409)
+        self.assertEqual(Device.objects.get().ram_gb, 16)
+
+    def test_rejects_missing_auth_readonly_and_viewer(self):
+        self.assertEqual(self.client.post(reverse('inventory-api:device-list'), self.payload).status_code, 401)
+        _, key = InventoryAPIKey.objects.create_key(name='read', service_user=self.user, can_read=True,
+                                                    expiry_date=timezone.now() + timedelta(days=1))
+        self.assertEqual(self.post(key=key).status_code, 403)
+        self.user.is_superuser = False
+        self.user.save()
+        self.user.profile.role = 'VIEWER'
+        self.user.profile.save()
+        self.assertEqual(self.post().status_code, 403)
+        self.assertFalse(Device.objects.exists())
+
+    def test_strict_validation_and_active_choices(self):
+        for changes in ({'status': self.kind.pk}, {'status': None}, {'device_type': None},
+                        {'ram_gb': -1}, {'number': 99}, {'stage': 'STORAGE'}, {'request_id': 'bad'}):
+            with self.subTest(changes=changes):
+                self.assertEqual(self.post({**self.payload, **changes}).status_code, 400)
+        for missing in ('status', 'device_type', 'request_id'):
+            self.assertEqual(self.post({k: v for k, v in self.payload.items() if k != missing}).status_code, 400)
+        self.kind.active = False
+        self.kind.save()
+        self.assertEqual(self.post().status_code, 400)
+        self.assertFalse(Device.objects.exists())
+
+    def test_failure_rolls_back_device_receipt_and_number(self):
+        NumberSequence.objects.update_or_create(name='device', defaults={'last_value': 42})
+        with patch('inventory.api.add_audit', side_effect=RuntimeError('audit unavailable')):
+            with self.assertRaises(RuntimeError):
+                self.post()
+        self.assertFalse(Device.objects.exists())
+        self.assertFalse(DeviceRegistration.objects.exists())
+        self.assertEqual(NumberSequence.objects.get(name='device').last_value, 42)
+
+
+class ConcurrentRegistrationTests(TransactionTestCase):
+    @skipUnlessDBFeature('has_select_for_update')
+    def test_simultaneous_retry_allocates_once(self):
+        user = User.objects.create_user('concurrent-usb', is_superuser=True)
+        _, key = InventoryAPIKey.objects.create_key(name='usb', service_user=user, can_read=True, can_write=True,
+                                                    expiry_date=timezone.now() + timedelta(days=1))
+        status = ChoiceValue.objects.create(kind='status', label='Neu')
+        kind = ChoiceValue.objects.create(kind='device_type', label='Desktop')
+        NumberSequence.objects.update_or_create(name='device', defaults={'last_value': 0})
+        payload = {'request_id': str(uuid.uuid4()), 'status': status.pk, 'device_type': kind.pk}
+        barrier = Barrier(2)
+
+        def submit(_):
+            close_old_connections()
+            try:
+                barrier.wait(timeout=10)
+                response = Client().post(reverse('inventory-api:device-list'), json.dumps(payload),
+                                         content_type='application/json', HTTP_AUTHORIZATION=f'Api-Key {key}')
+                return response.status_code, response.json()['number']
+            finally:
+                close_old_connections()
+
+        with ThreadPoolExecutor(max_workers=2) as pool:
+            results = list(pool.map(submit, range(2)))
+        self.assertEqual(sorted(code for code, _ in results), [200, 201])
+        self.assertEqual(len({number for _, number in results}), 1)
+        self.assertEqual(Device.objects.count(), 1)