Completely change response structure

common/response.go

@@ -1,8 +1,36 @@
 package common
 
-// Response is the data that is always returned with an API request.
-type Response struct {
-	Code    int         `json:"code"`
-	Message string      `json:"message,omitempty"`
-	Data    interface{} `json:"data"`
+// ResponseBase is the data that is always returned with an API request.
+type ResponseBase struct {
+	Code    int    `json:"code"`
+	Message string `json:"message,omitempty"`
+}
+
+// GetCode retrieves the response code.
+func (r ResponseBase) GetCode() int {
+	return r.Code
+}
+
+// SetCode changes the response code.
+func (r *ResponseBase) SetCode(i int) {
+	r.Code = i
+}
+
+// GetMessage retrieves the response message.
+func (r ResponseBase) GetMessage() string {
+	return r.Message
+}
+
+// CodeMessager is something that has the Code() and Message() methods.
+type CodeMessager interface {
+	GetMessage() string
+	GetCode() int
+}
+
+// SimpleResponse returns the most basic response.
+func SimpleResponse(code int, message string) CodeMessager {
+	return ResponseBase{
+		Code:    code,
+		Message: message,
+	}
 }