fix: generate absolute URI when attaching links in invoice and payment

notification

fixes: https://gitea.hostea.org/Hostea/dashboard/issues/37

billing/templates/billing/emails/payment-receipt.txt

@@ -14,7 +14,7 @@ Hostea Receipt - {{payment.date.month}}/{{payment.date.day}}/{{payment.date.year
 
 To view the receipt online, please see the following link: 
 
-{% url 'billing.invoice.details' payment_public_id=payment.public_ref %}
+{{link}}
 
 We appreciate your business!
 

billing/utils.py

@@ -13,6 +13,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 from enum import Enum, unique
+from urllib.parse import urlparse, urlunparse
 from datetime import datetime, timedelta, timezone
 
 from payments import get_payment_model, RedirectNeeded, PaymentStatus
@@ -33,6 +34,10 @@ def __get_delta():
     delta = now - timedelta(seconds=(60 * 60 * 24 * 30))  # one month
     return delta
 
+def get_invoice_link(payment: Payment):
+    invoice_link = reverse("billing.invoice.details", args=(payment.public_ref,))
+    parsed = urlparse(settings.PAYMENT_HOST)
+    return urlunparse((parsed.scheme, parsed.netloc, invoice_link, "", "", ""))
 
 def payment_fullfilled(instance: Instance) -> bool:
     delta = __get_delta()
@@ -87,7 +92,8 @@ def generate_invoice(instance: Instance) -> Payment:
             instance=instance,
         )
 
-        invoice_link = reverse("billing.invoice.details", args=(payment.public_ref,))
+        invoice_link = get_invoice_link(payment=payment)
+
         ctx = {
             "username": instance.owned_by.username,
             "link": invoice_link,
@@ -102,6 +108,7 @@ def generate_invoice(instance: Instance) -> Payment:
         email = instance.owned_by.email
         sender = settings.DEFAULT_FROM_EMAIL
 
+
         send_mail(
             subject="[Hostea] An invoice is generated for your Hostea VM",
             message=body,

billing/views.py

@@ -33,6 +33,7 @@ from .utils import (
     generate_invoice as generate_invoice_util,
     GenerateInvoiceErrorCode,
     GenerateInvoiceException,
+    get_invoice_link
 )
 
 
@@ -111,9 +112,11 @@ def payment_success(request, payment_public_id):
     payment = get_object_or_404(
         get_payment_model(), public_ref=payment_public_id, paid_by=request.user
     )
+
     ctx = {
         "username": request.user.username,
         "payment": payment,
+        "link": get_invoice_link(payment=payment),
     }
 
     body = render_to_string(