Add new validation methods

Signed-off-by: Volkan Özçelik <[email protected]>

validation/validation.go

@@ -1,6 +1,7 @@
 package validation
 
 import (
+	"github.com/google/uuid"
 	"regexp"
 
 	"github.com/spiffe/spike-sdk-go/api/errors"
@@ -67,3 +68,13 @@ func ValidatePathPattern(pathPattern string) error {
 
 	return nil
 }
+
+// ValidatePolicyId verifies if the given policyId is a valid UUID format.
+// Returns errors.ErrInvalidInput if the validation fails.
+func ValidatePolicyId(policyId string) error {
+	err := uuid.Validate(policyId)
+	if err != nil {
+		return errors.ErrInvalidInput
+	}
+	return nil
+}