Merge pull request #72 from projectdiscovery/issue-68-struct-walk

Moving walk to utils package

structs/structs.go

@@ -0,0 +1,37 @@
+package structs
+
+import "reflect"
+
+// CallbackFunc on the struct field
+// example:
+// structValue := reflect.ValueOf(s)
+// ...
+// field := structValue.Field(i)
+// fieldType := structValue.Type().Field(i)
+type CallbackFunc func(reflect.Value, reflect.StructField)
+
+// Walk traverses a struct and executes a callback function on each field in the struct.
+// The interface{} passed to the function should be a pointer to a struct
+func Walk(s interface{}, callback CallbackFunc) {
+	structValue := reflect.ValueOf(s)
+	if structValue.Kind() == reflect.Ptr {
+		structValue = structValue.Elem()
+	}
+	if structValue.Kind() != reflect.Struct {
+		return
+	}
+	for i := 0; i < structValue.NumField(); i++ {
+		field := structValue.Field(i)
+		fieldType := structValue.Type().Field(i)
+		if !fieldType.IsExported() {
+			continue
+		}
+		if field.Kind() == reflect.Struct {
+			Walk(field.Addr().Interface(), callback)
+		} else if field.Kind() == reflect.Ptr && field.Elem().Kind() == reflect.Struct {
+			Walk(field.Interface(), callback)
+		} else {
+			callback(field, fieldType)
+		}
+	}
+}