works enough for now

compiler/nat.py

@@ -0,0 +1,29 @@
+import hashlib
+
+def rule_id(service_name: str, kind: str) -> int:
+	h = hashlib.sha1(f"{service_name}:{kind}".encode()).hexdigest()
+	return(int(h[:4], 16))  # here's hoping
+
+def build_nat_rules(services, cfg):
+	rules = []
+
+	for s in services:
+		rid_wan = rule_id(s.name, "dnat_wan")
+		rid_hairpin = rule_id(s.name, "dnat_hairpin")
+
+		rules.append({
+			"id": rid_wan,
+			"service": s,
+			"cfg": cfg,
+			"kind": "dnat_wan",
+		})
+
+		if "nat" in s.exposure:
+			rules.append({
+				"id": rid_hairpin,
+				"service": s,
+				"cfg": cfg,
+				"kind": "dnat_hairpin",
+			})
+
+	return(rules)