Fixes: #19669 - Add an API endpoint to download image attachments

netbox/extras/api/views.py

@@ -1,5 +1,7 @@
+from django.conf import settings
 from django.http import Http404
 from django.shortcuts import get_object_or_404
+from django.views.static import serve
 from django_rq.queues import get_connection
 from drf_spectacular.utils import extend_schema, extend_schema_view
 from rest_framework import status
@@ -200,6 +202,17 @@ class ImageAttachmentViewSet(NetBoxModelViewSet):
     serializer_class = serializers.ImageAttachmentSerializer
     filterset_class = filtersets.ImageAttachmentFilterSet
 
+    @action(
+        methods=['GET'],
+        detail=True,
+        url_path='download',
+        url_name='download',
+    )
+    def download(self, request, pk, *args, **kwargs):
+        obj = get_object_or_404(self.queryset, pk=pk)
+        # Render and return the elevation as an SVG drawing with the correct content type
+        return serve(request, obj.image.name, document_root=settings.MEDIA_ROOT)
+
 
 #
 # Journal entries

netbox/extras/tests/test_api.py

@@ -1,6 +1,8 @@
 import datetime
 
+from PIL import Image
 from django.contrib.contenttypes.models import ContentType
+from django.core.files.base import File
 from django.urls import reverse
 from django.utils.timezone import make_aware, now
 from rest_framework import status
@@ -616,6 +618,38 @@ def setUpTestData(cls):
         )
         ImageAttachment.objects.bulk_create(image_attachments)
 
+    def test_image_download(self):
+        self.add_permissions('extras.view_imageattachment')
+        ct = ContentType.objects.get_for_model(Site)
+        site = Site.objects.get(name='Site 1', slug='site-1')
+
+        image = Image.new('RGB', size=(1, 1), color=(255, 0, 0))
+        image.save('test_image_download.png', format='PNG')
+        image_file = File(open('test_image_download.png', 'rb'))
+        content = image_file.read()
+
+        attachment = ImageAttachment(
+            object_type=ct,
+            object_id=site.pk,
+            name='Image Attachment 4',
+            image_height=1,
+            image_width=1
+        )
+        attachment.image.save('test_image_download.png', image_file, save=True)
+        attachment.save()
+
+        image = ImageAttachment.objects.get(name='Image Attachment 4')
+        url = reverse('extras-api:imageattachment-download', kwargs={'pk': image.pk})
+        response = self.client.get(url, **self.header)
+        downloaded_content = b''.join(response.streaming_content)
+
+        self.assertEqual(response.headers.get('Content-Type'), 'image/png')
+        self.assertEqual(response.headers.get('Content-Length'), '69')
+        self.assertEqual(
+            response.headers.get('Content-Disposition'), f'inline; filename="site_{site.pk}_Image_Attachment_4.png"'
+        )
+        self.assertEqual(content, downloaded_content)
+
 
 class JournalEntryTest(APIViewTestCases.APIViewTestCase):
     model = JournalEntry