feat: add admin invoice download

weblate_web/invoices/admin.py

@@ -17,10 +17,18 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #
 
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any
+
 from django.contrib import admin
+from django.urls import reverse
 
 from .models import Discount, Invoice, InvoiceItem
 
+if TYPE_CHECKING:
+    from django.http.request import HttpRequest
+
 
 @admin.register(Discount)
 class DiscountAdmin(admin.ModelAdmin):
@@ -30,6 +38,7 @@ class DiscountAdmin(admin.ModelAdmin):
 
 class InvoiceItemAdmin(admin.TabularInline):
     model = InvoiceItem
+    min_num = 1
 
 
 @admin.register(Invoice)
@@ -43,3 +52,14 @@ class InvoiceAdmin(admin.ModelAdmin):
         "number",
     )
     inlines = (InvoiceItemAdmin,)
+
+    def save_related(
+        self, request: HttpRequest, form: Any, formsets: Any, change: Any
+    ) -> None:
+        super().save_related(
+            request=request, form=form, formsets=formsets, change=change
+        )
+        form.instance.generate_files()
+
+    def view_on_site(self, obj):
+        return reverse("invoice-pdf", kwargs={"pk": obj.pk})

weblate_web/invoices/views.py

@@ -1 +1,20 @@
-# Create your views here.
+from django.contrib.auth.decorators import login_required, user_passes_test
+from django.http import FileResponse
+from django.shortcuts import get_object_or_404
+
+from weblate_web.views import AuthenticatedHttpRequest
+
+from .models import Invoice
+
+
+@login_required
+@user_passes_test(lambda u: u.is_superuser)
+def download_invoice(request: AuthenticatedHttpRequest, pk: int):
+    invoice = get_object_or_404(Invoice, pk=pk)
+
+    return FileResponse(
+        invoice.path.open("rb"),
+        as_attachment=True,
+        filename=invoice.filename,
+        content_type="application/pdf",
+    )

weblate_web/urls.py

@@ -31,6 +31,7 @@
 from django.views.decorators.cache import cache_page
 from django.views.generic import RedirectView, TemplateView
 
+from weblate_web.invoices.views import download_invoice
 from weblate_web.models import Post
 from weblate_web.views import (
     AddDiscoveryView,
@@ -54,7 +55,7 @@
     api_user,
     disable_repeat,
     donate_pay,
-    download_invoice,
+    download_payment_invoice,
     fetch_vat,
     not_found,
     process_payment,
@@ -201,7 +202,11 @@ def lastmod(self, item):
             r"^donate/edit/(?P<pk>[0-9]+)/$", EditLinkView.as_view(), name="donate-edit"
         ),
         re_path(r"^donate/pay/(?P<pk>[0-9]+)/$", donate_pay, name="donate-pay"),
-        re_path(r"^user/invoice/" + UUID + "/$", download_invoice, name="user-invoice"),
+        re_path(
+            r"^user/invoice/" + UUID + "/$",
+            download_payment_invoice,
+            name="user-invoice",
+        ),
         re_path(
             r"^donate/disable/(?P<pk>[0-9]+)/$", disable_repeat, name="donate-disable"
         ),
@@ -285,6 +290,7 @@ def lastmod(self, item):
             CompleteView.as_view(),
             name="payment-complete",
         ),
+        path("invoice/<int:pk>/pdf/", download_invoice, name="invoice-pdf"),
         # FOSDEM short link
         re_path(
             r"^FOSDEM/|fosdem/$",

weblate_web/views.py

@@ -546,7 +546,7 @@ def process_payment(request):
 
 
 @login_required
-def download_invoice(request, pk):
+def download_payment_invoice(request, pk):
     # Allow downloading own invoices of pending ones (for proforma invoices)
     payment = get_object_or_404(Payment, pk=pk)