Initial import of map-asset-gateway

services/api-go/internal/uid/deterministic.go

@@ -0,0 +1,25 @@
+package uid
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"strings"
+)
+
+// Deterministic returns a stable UUID-like identifier derived from the input.
+func Deterministic(parts ...string) string {
+	sum := sha1.Sum([]byte(strings.Join(parts, "::")))
+	b := sum[:16]
+
+	b[6] = (b[6] & 0x0f) | 0x50
+	b[8] = (b[8] & 0x3f) | 0x80
+
+	return fmt.Sprintf(
+		"%08x-%04x-%04x-%04x-%012x",
+		b[0:4],
+		b[4:6],
+		b[6:8],
+		b[8:10],
+		b[10:16],
+	)
+}