feat: add email confirmation and QR generation

backend/bookings/emailing.py

@@ -0,0 +1,37 @@
+import logging
+
+from django.core.mail import send_mail
+
+
+logger = logging.getLogger(__name__)
+
+CONFIRMATION_PATH = "/api/reservations/confirm/"
+
+
+def build_confirmation_link(raw_confirmation_token):
+    return f"{CONFIRMATION_PATH}?token={raw_confirmation_token}"
+
+
+def send_confirmation_email(*, reservation, raw_confirmation_token):
+    confirmation_link = build_confirmation_link(raw_confirmation_token)
+    subject = f"Confirm your reservation for {reservation.performance.show.title}"
+    message = (
+        "Thank you for your reservation request.\n\n"
+        "Please confirm your reservation by opening this link:\n"
+        f"{confirmation_link}\n\n"
+        "If you did not request this reservation, you can ignore this email."
+    )
+
+    try:
+        send_mail(
+            subject=subject,
+            message=message,
+            from_email=None,
+            recipient_list=[reservation.email],
+            fail_silently=False,
+        )
+    except Exception:
+        logger.exception(
+            "Failed to send confirmation email for reservation %s.",
+            reservation.id,
+        )