client: add error subtypes for name and owner validation in json output

src/core/protocol/request_validation.rs

@@ -34,6 +34,14 @@ impl NameValidationError {
             .to_owned(),
         }
     }
+
+    pub fn error_type(&self) -> &'static str {
+        match self {
+            NameValidationError::EmptyString => "empty-string",
+            NameValidationError::InvalidCharacters => "invalid-characters",
+            NameValidationError::TooLong => "too-long",
+        }
+    }
 }
 
 impl OwnerValidationError {
@@ -81,6 +89,13 @@ impl OwnerValidationError {
             .to_string(),
         }
     }
+
+    pub fn error_type(&self) -> &'static str {
+        match self {
+            OwnerValidationError::NoMatch => "no-match",
+            OwnerValidationError::StringEmpty => "string-empty",
+        }
+    }
 }
 
 #[derive(Debug, PartialEq, Eq, Clone, Copy, Serialize, Deserialize)]