Validate each token of multi-value enum fields

validation.go

@@ -16,6 +16,8 @@
 package quickfix
 
 import (
+	"bytes"
+
 	"github.com/quickfixgo/quickfix/datadictionary"
 )
 
@@ -385,10 +387,21 @@ func validateField(d *datadictionary.DataDictionary,
 		return nil
 	}
 
-	allowedValues := d.FieldTypeByTag[int(field.tag)].Enums
+	allowedValues := fieldType.Enums
 	if len(allowedValues) != 0 {
-		if _, validValue := allowedValues[string(field.value)]; !validValue {
-			return ValueIsIncorrect(field.tag)
+		switch fieldType.Type {
+		case "MULTIPLESTRINGVALUE", "MULTIPLEVALUESTRING", "MULTIPLECHARVALUE":
+			// These fields carry a space-delimited set of enum tokens, each of
+			// which must be individually valid (e.g. ExecInst "1 5" = two enums).
+			for _, component := range bytes.Split(field.value, []byte{' '}) {
+				if _, validValue := allowedValues[string(component)]; !validValue {
+					return ValueIsIncorrect(field.tag)
+				}
+			}
+		default:
+			if _, validValue := allowedValues[string(field.value)]; !validValue {
+				return ValueIsIncorrect(field.tag)
+			}
 		}
 	}
 

validation_test.go

@@ -86,6 +86,8 @@ func TestValidate(t *testing.T) {
 		tcCheckUserDefinedFieldsDisabled(),
 		tcCheckUserDefinedFieldsDisabledFixT(),
 		tcMultipleRepeatingGroupFields(),
+		tcMultiValueEnumValid(),
+		tcMultiValueEnumInvalidComponent(),
 	}
 
 	msg := NewMessage()
@@ -662,6 +664,42 @@ func tcValueIsIncorrectFixT() validateTest {
 	}
 }
 
+func tcMultiValueEnumValid() validateTest {
+	dict, _ := datadictionary.Parse("spec/FIX43.xml")
+	validator := NewValidator(defaultValidatorSettings, dict, nil)
+
+	// ExecInst (tag 18) is a MULTIPLEVALUESTRING: a space-delimited set of
+	// individually-valid enum tokens (e.g. "Y M") must be accepted.
+	builder := createFIX43NewOrderSingle()
+	builder.Body.SetField(Tag(18), FIXString("Y M"))
+	msgBytes := builder.build()
+
+	return validateTest{
+		TestName:          "Multi-value enum valid",
+		Validator:         validator,
+		MessageBytes:      msgBytes,
+		DoNotExpectReject: true,
+	}
+}
+
+func tcMultiValueEnumInvalidComponent() validateTest {
+	dict, _ := datadictionary.Parse("spec/FIX43.xml")
+	validator := NewValidator(defaultValidatorSettings, dict, nil)
+
+	tag := Tag(18)
+	builder := createFIX43NewOrderSingle()
+	builder.Body.SetField(tag, FIXString("Y ZZ")) // ZZ is not a valid ExecInst enum
+	msgBytes := builder.build()
+
+	return validateTest{
+		TestName:             "Multi-value enum invalid component",
+		Validator:            validator,
+		MessageBytes:         msgBytes,
+		ExpectedRejectReason: rejectReasonValueIsIncorrect,
+		ExpectedRefTagID:     &tag,
+	}
+}
+
 func tcIncorrectDataFormatForValue() validateTest {
 	dict, _ := datadictionary.Parse("spec/FIX40.xml")
 	validator := NewValidator(defaultValidatorSettings, dict, nil)