feat: add booking REST API

backend/bookings/serializers.py

@@ -0,0 +1,41 @@
+from rest_framework import serializers
+
+
+class StrictSerializer(serializers.Serializer):
+    def validate(self, attrs):
+        unknown_fields = set(self.initial_data) - set(self.fields)
+        if unknown_fields:
+            raise serializers.ValidationError(
+                {field: ["Unexpected field."] for field in sorted(unknown_fields)}
+            )
+        return attrs
+
+
+class ReservationCreateSerializer(StrictSerializer):
+    name = serializers.CharField(max_length=200, trim_whitespace=True)
+    email = serializers.EmailField()
+    phone = serializers.CharField(max_length=40, trim_whitespace=True, required=False, allow_blank=True)
+    party_size = serializers.IntegerField(min_value=1)
+    notes = serializers.CharField(trim_whitespace=True, required=False, allow_blank=True)
+
+
+class ReservationCreateResponseSerializer(serializers.Serializer):
+    id = serializers.IntegerField()
+    status = serializers.CharField()
+    performance = serializers.IntegerField(source="performance_id")
+    party_size = serializers.IntegerField()
+    message = serializers.CharField()
+
+
+class ReservationConfirmSerializer(StrictSerializer):
+    token = serializers.CharField(trim_whitespace=True, allow_blank=False)
+
+
+class ReservationConfirmResponseSerializer(serializers.Serializer):
+    reservation_id = serializers.IntegerField(source="reservation.id")
+    status = serializers.CharField(source="reservation.status")
+    party_size = serializers.IntegerField(source="reservation.party_size")
+    qr_code_url = serializers.SerializerMethodField()
+
+    def get_qr_code_url(self, result):
+        return f"/api/reservations/{result.reservation.id}/qr-code/"