feat: upload file in contact form

apps/pages/admin.py

@@ -1,11 +1,13 @@
 from django.contrib import admin
-from django.http import HttpResponseRedirect
-from django.urls import reverse
+from django.http import FileResponse, Http404, HttpResponseRedirect
+from django.urls import path, reverse
+from django.utils.html import format_html
 
 from .models import (
     AboutSection,
     AboutSectionItem,
     ContactSubmission,
+    ContactSubmissionAttachment,
     CustomPage,
     CustomPageSection,
     CustomPageSectionItem,
@@ -83,6 +85,21 @@ class AboutSectionAdmin(admin.ModelAdmin):
     )
 
 
+class ContactSubmissionAttachmentInline(admin.TabularInline):
+    model = ContactSubmissionAttachment
+    extra = 0
+    can_delete = False
+    fields = ("original_filename", "attachment_link", "uploaded_at")
+    readonly_fields = ("original_filename", "attachment_link", "uploaded_at")
+
+    @admin.display(description="File")
+    def attachment_link(self, obj):
+        if not obj.file:
+            return "—"
+        url = reverse("admin:pages_contactattachment_download", args=[obj.pk])
+        return format_html('<a href="{}">Download</a>', url)
+
+
 @admin.register(ContactSubmission)
 class ContactSubmissionAdmin(admin.ModelAdmin):
     list_display = ("name", "title", "email", "submitted_at", "is_read")
@@ -90,11 +107,36 @@ class ContactSubmissionAdmin(admin.ModelAdmin):
     search_fields = ("name", "title", "description", "email")
     list_editable = ("is_read",)
     readonly_fields = ("name", "title", "description", "email", "submitted_at")
+    inlines = [ContactSubmissionAttachmentInline]
     fieldsets = (
         (None, {"fields": ("name", "title", "email", "description")}),
         ("Meta", {"fields": ("submitted_at", "is_read")}),
     )
 
+    def get_urls(self):
+        urls = super().get_urls()
+        custom_urls = [
+            path(
+                "attachment/<int:attachment_id>/download/",
+                self.admin_site.admin_view(self.download_attachment),
+                name="pages_contactattachment_download",
+            ),
+        ]
+        return custom_urls + urls
+
+    def download_attachment(self, request, attachment_id):
+        try:
+            attachment = ContactSubmissionAttachment.objects.get(pk=attachment_id)
+        except ContactSubmissionAttachment.DoesNotExist as exc:
+            raise Http404 from exc
+        if not attachment.file:
+            raise Http404
+        return FileResponse(
+            attachment.file.open("rb"),
+            as_attachment=True,
+            filename=attachment.original_filename,
+        )
+
 
 @admin.register(FAQEntry)
 class FAQEntryAdmin(admin.ModelAdmin):