helper/schema: ValidateFunc support for maps

helper/schema/schema.go

@@ -540,8 +540,8 @@ func (m schemaMap) InternalValidate(topSchemaMap schemaMap) error {
 
 		if v.ValidateFunc != nil {
 			switch v.Type {
-			case TypeList, TypeSet, TypeMap:
-				return fmt.Errorf("ValidateFunc is only supported on primitives.")
+			case TypeList, TypeSet:
+				return fmt.Errorf("ValidateFunc is not yet supported on lists or sets.")
 			}
 		}
 	}
@@ -1118,6 +1118,17 @@ func (m schemaMap) validateMap(
 		}
 	}
 
+	if schema.ValidateFunc != nil {
+		validatableMap := make(map[string]interface{})
+		for _, raw := range raws {
+			for k, v := range raw.(map[string]interface{}) {
+				validatableMap[k] = v
+			}
+		}
+
+		return schema.ValidateFunc(validatableMap, k)
+	}
+
 	return nil, nil
 }
 

helper/schema/schema_test.go

@@ -2903,7 +2903,7 @@ func TestSchemaMap_InternalValidate(t *testing.T) {
 		{
 			map[string]*Schema{
 				"foo": &Schema{
-					Type:     TypeMap,
+					Type:     TypeSet,
 					Required: true,
 					ValidateFunc: func(v interface{}, k string) (ws []string, es []error) {
 						return