Implement offline license verification (T-502)

core/licensing/license.go

@@ -0,0 +1,25 @@
+package licensing
+
+import "time"
+
+// License is a verified License v1 document. It never contains the source
+// document, signature, public key, or raw machine identifiers.
+type License struct {
+	LicenseID    string
+	MachineHash  string
+	Products     []string
+	IssuedAt     time.Time
+	Perpetual    bool
+	UpdatePolicy string
+	RebindPolicy string
+}
+
+// AuthorizesProduct reports whether this verified license lists productID.
+func (license License) AuthorizesProduct(productID string) bool {
+	for _, licensedProduct := range license.Products {
+		if licensedProduct == productID {
+			return true
+		}
+	}
+	return false
+}