Merge pull request #86 from joeybloggs/v5-development

Correct interface panic & add interface type handling

Author: Dean Karn

validator.go

@@ -353,7 +353,6 @@ func (v *Validate) structRecursive(top interface{}, current interface{}, s inter
 		structName = structType.Name()
 		numFields = structValue.NumField()
 		cs = &cachedStruct{name: structName, children: numFields}
-		structCache.Set(structType, cs)
 	}
 
 	validationErrors := structPool.Borrow()
@@ -429,24 +428,62 @@ func (v *Validate) structRecursive(top interface{}, current interface{}, s inter
 					continue
 				}
 
-				if valueField.Kind() == reflect.Ptr && valueField.IsNil() {
+				if (valueField.Kind() == reflect.Ptr || cField.kind == reflect.Interface) && valueField.IsNil() {
 
 					if strings.Contains(cField.tag, omitempty) {
-						continue
+						goto CACHEFIELD
 					}
 
-					if strings.Contains(cField.tag, required) {
+					tags := strings.Split(cField.tag, tagSeparator)
+
+					if len(tags) > 0 {
+
+						var param string
+						vals := strings.SplitN(tags[0], tagKeySeparator, 2)
+
+						if len(vals) > 1 {
+							param = vals[1]
+						}
 
 						validationErrors.Errors[cField.name] = &FieldError{
 							Field: cField.name,
-							Tag:   required,
+							Tag:   vals[0],
+							Param: param,
 							Value: valueField.Interface(),
+							Kind:  valueField.Kind(),
+							Type:  valueField.Type(),
 						}
 
-						continue
+						goto CACHEFIELD
+					}
+				}
+
+				// if we get here, the field is interface and could be a struct or a field
+				// and we need to check the inner type and validate
+				if cField.kind == reflect.Interface {
+
+					valueField = valueField.Elem()
+
+					if valueField.Kind() == reflect.Ptr && !valueField.IsNil() {
+						valueField = valueField.Elem()
+					}
+
+					if valueField.Kind() == reflect.Struct {
+						goto VALIDATESTRUCT
+					}
+
+					// sending nil for cField as it was type interface and could be anything
+					// each time and so must be calculated each time and can't be cached reliably
+					if fieldError := v.fieldWithNameAndValue(top, current, valueField.Interface(), cField.tag, cField.name, false, nil); fieldError != nil {
+						validationErrors.Errors[fieldError.Field] = fieldError
+						// free up memory reference
+						fieldError = nil
 					}
+
+					goto CACHEFIELD
 				}
 
+			VALIDATESTRUCT:
 				if structErrors := v.structRecursive(top, valueField.Interface(), valueField.Interface()); structErrors != nil {
 					validationErrors.StructErrors[cField.name] = structErrors
 					// free up memory map no longer needed
@@ -486,11 +523,14 @@ func (v *Validate) structRecursive(top interface{}, current interface{}, s inter
 			}
 		}
 
+	CACHEFIELD:
 		if !isCached {
 			cs.fields = append(cs.fields, cField)
 		}
 	}
 
+	structCache.Set(structType, cs)
+
 	if len(validationErrors.Errors) == 0 && len(validationErrors.StructErrors) == 0 {
 		structPool.Return(validationErrors)
 		return nil
@@ -709,26 +749,60 @@ func (v *Validate) traverseMap(val interface{}, current interface{}, valueField
 				continue
 			}
 
-			if idxField.Kind() == reflect.Ptr && idxField.IsNil() {
+			if (idxField.Kind() == reflect.Ptr || idxField.Kind() == reflect.Interface) && idxField.IsNil() {
 
-				if strings.Contains(cField.tag, omitempty) {
+				if strings.Contains(cField.diveTag, omitempty) {
 					continue
 				}
 
-				if strings.Contains(cField.tag, required) {
+				tags := strings.Split(cField.diveTag, tagSeparator)
+
+				if len(tags) > 0 {
+
+					var param string
+					vals := strings.SplitN(tags[0], tagKeySeparator, 2)
+
+					if len(vals) > 1 {
+						param = vals[1]
+					}
 
 					errs[key.Interface()] = &FieldError{
 						Field: fmt.Sprintf(mapIndexFieldName, cField.name, key.Interface()),
-						Tag:   required,
+						Tag:   vals[0],
+						Param: param,
 						Value: idxField.Interface(),
-						Kind:  reflect.Ptr,
+						Kind:  idxField.Kind(),
 						Type:  cField.mapSubtype,
 					}
 				}
 
 				continue
 			}
 
+			// if we get here, the field is interface and could be a struct or a field
+			// and we need to check the inner type and validate
+			if idxField.Kind() == reflect.Interface {
+
+				idxField = idxField.Elem()
+
+				if idxField.Kind() == reflect.Ptr && !idxField.IsNil() {
+					idxField = idxField.Elem()
+				}
+
+				if idxField.Kind() == reflect.Struct {
+					goto VALIDATESTRUCT
+				}
+
+				// sending nil for cField as it was type interface and could be anything
+				// each time and so must be calculated each time and can't be cached reliably
+				if fieldError := v.fieldWithNameAndValue(val, current, idxField.Interface(), cField.diveTag, fmt.Sprintf(mapIndexFieldName, cField.name, key.Interface()), false, nil); fieldError != nil {
+					errs[key.Interface()] = fieldError
+				}
+
+				continue
+			}
+
+		VALIDATESTRUCT:
 			if structErrors := v.structRecursive(val, current, idxField.Interface()); structErrors != nil {
 				errs[key.Interface()] = structErrors
 			}
@@ -768,26 +842,60 @@ func (v *Validate) traverseSliceOrArray(val interface{}, current interface{}, va
 				continue
 			}
 
-			if idxField.Kind() == reflect.Ptr && idxField.IsNil() {
+			if (idxField.Kind() == reflect.Ptr || idxField.Kind() == reflect.Interface) && idxField.IsNil() {
 
-				if strings.Contains(cField.tag, omitempty) {
+				if strings.Contains(cField.diveTag, omitempty) {
 					continue
 				}
 
-				if strings.Contains(cField.tag, required) {
+				tags := strings.Split(cField.diveTag, tagSeparator)
+
+				if len(tags) > 0 {
+
+					var param string
+					vals := strings.SplitN(tags[0], tagKeySeparator, 2)
+
+					if len(vals) > 1 {
+						param = vals[1]
+					}
 
 					errs[i] = &FieldError{
 						Field: fmt.Sprintf(arrayIndexFieldName, cField.name, i),
-						Tag:   required,
+						Tag:   vals[0],
+						Param: param,
 						Value: idxField.Interface(),
-						Kind:  reflect.Ptr,
+						Kind:  idxField.Kind(),
 						Type:  cField.sliceSubtype,
 					}
 				}
 
 				continue
 			}
 
+			// if we get here, the field is interface and could be a struct or a field
+			// and we need to check the inner type and validate
+			if idxField.Kind() == reflect.Interface {
+
+				idxField = idxField.Elem()
+
+				if idxField.Kind() == reflect.Ptr && !idxField.IsNil() {
+					idxField = idxField.Elem()
+				}
+
+				if idxField.Kind() == reflect.Struct {
+					goto VALIDATESTRUCT
+				}
+
+				// sending nil for cField as it was type interface and could be anything
+				// each time and so must be calculated each time and can't be cached reliably
+				if fieldError := v.fieldWithNameAndValue(val, current, idxField.Interface(), cField.diveTag, fmt.Sprintf(arrayIndexFieldName, cField.name, i), false, nil); fieldError != nil {
+					errs[i] = fieldError
+				}
+
+				continue
+			}
+
+		VALIDATESTRUCT:
 			if structErrors := v.structRecursive(val, current, idxField.Interface()); structErrors != nil {
 				errs[i] = structErrors
 			}