Restructure

http/error.go

@@ -0,0 +1,40 @@
+package http
+
+import "net/http"
+
+type appError struct {
+	Error       error
+	Message     string
+	Code        int
+	ContentType string
+}
+
+func internalServerError(err error) *appError {
+	return &appError{
+		Error:   err,
+		Message: "Internal server error",
+		Code:    http.StatusInternalServerError,
+	}
+}
+
+func notFound(err error) *appError {
+	return &appError{Error: err, Code: http.StatusNotFound}
+}
+
+func badRequest(err error) *appError {
+	return &appError{Error: err, Code: http.StatusBadRequest}
+}
+
+func (e *appError) AsJSON() *appError {
+	e.ContentType = jsonMediaType
+	return e
+}
+
+func (e *appError) WithMessage(message string) *appError {
+	e.Message = message
+	return e
+}
+
+func (e *appError) IsJSON() bool {
+	return e.ContentType == jsonMediaType
+}