Remove dependency django_userforeignkey, dedicated admin download att…

…achment view

README.md

@@ -13,20 +13,14 @@ If used with DRF, `django-filter` is an additional requirement.
 pip install git+https://github.com/anexia/drf-attachments@main
 ```
 
-2. Integrate `drf_attachments` and `django_userforeignkey` into your `settings.py`
+2. Integrate `drf_attachments` into your `settings.py`
 
 ```python
 INSTALLED_APPS = [
     # ...
-    'django_userforeignkey',
     'drf_attachments',
     # ...
 ]
-
-MIDDLEWARE = [
-   # ...
-   'django_userforeignkey.middleware.UserForeignKeyMiddleware',
-]
 ```
 
 3. Configure attachment settings

drf_attachments/admin.py

@@ -1,7 +1,11 @@
+from content_disposition import rfc5987_content_disposition
 from django.contrib import admin
+from django.contrib.admin import AdminSite
+from django.contrib.admin.views.decorators import staff_member_required
 from django.contrib.contenttypes.admin import GenericTabularInline
 from django.forms import ChoiceField, ModelForm
-from django.urls import NoReverseMatch, reverse
+from django.http import StreamingHttpResponse
+from django.urls import NoReverseMatch, reverse, path
 from django.utils.safestring import mark_safe
 
 from drf_attachments.config import config
@@ -71,6 +75,29 @@ def content_object(obj):
         except NoReverseMatch:
             return entity
 
+    def get_urls(self):
+        urls = super().get_urls()
+        custom_urls = [
+            path(
+                "<path:object_id>/download/",
+                self.admin_site.admin_view(self.download_view),
+                name="drf_attachments_attachment_download"
+            ),
+        ]
+        return custom_urls + urls
+
+    def download_view(self, request, object_id):
+        attachment = Attachment.objects.get(pk=object_id)
+        response = StreamingHttpResponse(
+            attachment.file,
+            content_type=attachment.get_mime_type(),
+        )
+        response["Content-Disposition"] = rfc5987_content_disposition(
+            (attachment.name if attachment.name else str(attachment.pk)) + attachment.get_extension()
+        )
+
+        return response
+
 
 class BaseAttachmentInlineAdmin(GenericTabularInline, AttachmentAdminMixin):
     model = Attachment

drf_attachments/models/models.py

@@ -7,16 +7,13 @@
     CASCADE,
     CharField,
     DateTimeField,
-    FileField,
     ForeignKey,
     JSONField,
     Model,
     UUIDField,
 )
 from django.utils.translation import gettext_lazy as _
-from django_userforeignkey.request import get_current_request
 from rest_framework.exceptions import ValidationError
-from rest_framework.reverse import reverse
 
 from drf_attachments.config import config
 from drf_attachments.models.fields import DynamicStorageFileField
@@ -113,18 +110,6 @@ def is_image(self):
             and self.meta["mime_type"].startswith("image")
         )
 
-    @property
-    def download_url(self):
-        # Note: The attachment-download URL is auto-generated by the AttachmentViewSet
-        relative_url = reverse("attachment-download", kwargs={"pk": self.id})
-
-        # Make sure NOT to throw an exception in any case, otherwise the serializer will not provide the property
-        request = get_current_request()
-        if not request:
-            return relative_url
-
-        return request.build_absolute_uri(relative_url)
-
     @property
     def default_context(self):
         return config.default_context()

drf_attachments/rest/fields.py

@@ -0,0 +1,21 @@
+from django.urls import reverse
+from rest_framework import serializers
+
+__all__ = [
+    "DownloadURLField",
+]
+
+
+class DownloadURLField(serializers.Field):
+    def __init__(self, *args, **kwargs):
+        super().__init__(read_only=True, *args, **kwargs)
+    def get_attribute(self, instance):
+        request = self.context.get('request')
+        relative_url = reverse("attachment-download", kwargs={"pk": instance.pk})
+
+        if request is None:
+            return relative_url
+        return request.build_absolute_uri(relative_url)
+
+    def to_representation(self, value):
+        return value

drf_attachments/rest/serializers.py

@@ -3,6 +3,8 @@
 
 from drf_attachments.config import config
 from drf_attachments.models.models import Attachment
+from drf_attachments.rest.fields import DownloadURLField
+
 
 __all__ = [
     "AttachmentSerializer",
@@ -19,6 +21,7 @@ class AttachmentSerializer(serializers.ModelSerializer):
     file = FileField(write_only=True, required=True)
     content_object = config.get_content_object_field()
     context = ChoiceField(choices=config.context_choices(values_list=False))
+    download_url = DownloadURLField()
 
     class Meta:
         model = Attachment
@@ -33,12 +36,11 @@ class Meta:
             "file",
         )
 
-
 class AttachmentSubSerializer(serializers.ModelSerializer):
     """Sub serializer for nested data inside other serializers"""
 
     # pk is read-only by default
-    download_url = ReadOnlyField()
+    download_url = DownloadURLField()
     name = ReadOnlyField()
     context = ChoiceField(
         choices=config.context_choices(include_default=False, values_list=False),

drf_attachments/storage.py

@@ -10,6 +10,8 @@
     "attachment_upload_path",
 ]
 
+from drf_attachments.utils import get_admin_attachment_url
+
 
 class AttachmentFileStorage(FileSystemStorage):
     """
@@ -27,7 +29,7 @@ def url(self, name):
         if not attachment:
             return ""
 
-        return attachment.download_url
+        return get_admin_attachment_url(attachment.pk)
 
 
 def attachment_upload_path(attachment, filename):

drf_attachments/utils.py

@@ -1,6 +1,7 @@
 import os
 
 import magic
+from django.urls import reverse
 
 
 def get_mime_type(file):
@@ -30,3 +31,15 @@ def remove_file(file_path, raise_exceptions=False):
             # forward the thrown exception
             raise
         # just continue if deletion of old file was not possible and no exceptions should be raised
+
+
+def get_api_attachment_url(attachment_pk):
+    return reverse("attachment-download", kwargs={"pk": attachment_pk})
+
+def get_admin_attachment_url(attachment_pk):
+    return reverse(
+        "admin:drf_attachments_attachment_download",
+        kwargs={
+            "object_id": attachment_pk
+        }
+    )

requirements.txt

@@ -18,8 +18,8 @@ django>=3.2,<4
 djangorestframework>=3.13,<4
 python-magic>=0.4.18
 rest-framework-generic-relations>=2.0.0
-django-userforeignkey>=0.4
 django-filter>=21.1,<22
 
 # fix importlib version to avoid "AttributeError: 'EntryPoints' object has no attribute 'get'" with flake8
-importlib-metadata<5.0
+importlib-metadata<5.0
+content-disposition

setup.py

@@ -23,7 +23,6 @@
     install_requires=[
         "python-magic>=0.4.18",
         "rest-framework-generic-relations>=2.0.0",
-        "django-userforeignkey>=0.4",
     ],
     classifiers=[
         "Development Status :: 5 - Production/Stable",

tests/core/settings.py

@@ -26,7 +26,6 @@
     "django.contrib.messages",
     "django.contrib.staticfiles",
     "rest_framework",
-    "django_userforeignkey",
     "drf_attachments",
     "testapp",
 ]
@@ -39,7 +38,6 @@
     "django.contrib.auth.middleware.AuthenticationMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
-    "django_userforeignkey.middleware.UserForeignKeyMiddleware",
 ]
 
 ROOT_URLCONF = "core.urls"