Added hash functions to various low level models.

datamodel/low/v3/server_variable.go

@@ -1,7 +1,9 @@
 package v3
 
 import (
+	"crypto/sha256"
 	"github.com/pb33f/libopenapi/datamodel/low"
+	"strings"
 )
 
 // ServerVariable represents a low-level OpenAPI 3+ ServerVariable object.
@@ -16,3 +18,18 @@ type ServerVariable struct {
 	Default     low.NodeReference[string]
 	Description low.NodeReference[string]
 }
+
+// Hash will return a consistent SHA256 Hash of the ServerVariable object
+func (s *ServerVariable) Hash() [32]byte {
+	var f []string
+	for k := range s.Enum {
+		f = append(f, s.Enum[k].Value)
+	}
+	if !s.Default.IsEmpty() {
+		f = append(f, s.Default.Value)
+	}
+	if !s.Description.IsEmpty() {
+		f = append(f, s.Description.Value)
+	}
+	return sha256.Sum256([]byte(strings.Join(f, "|")))
+}