feat: user domain -- errors

pkg/errors/errors.go

@@ -0,0 +1,6 @@
+package errors
+
+var (
+	ErrPhoneInvalid      = NewAppError(400, "Invalid phone number", ErrorTypeValidation, nil)
+	ErrNationalIDInvalid = NewAppError(400, "Invalid national ID", ErrorTypeValidation, nil)
+)

pkg/errors/types.go

@@ -0,0 +1,51 @@
+package errors
+
+import (
+	"errors"
+)
+
+type ErrorType string
+
+const (
+	ErrorTypeValidation ErrorType = "VALIDATION_ERROR"
+
+	ErrorTypeAuth ErrorType = "AUTH_ERROR"
+)
+
+type AppError struct {
+	Code    int       `json:"code"`
+	Message string    `json:"message"`
+	Type    ErrorType `json:"type"`
+	Cause   error     `json:"_"`
+}
+
+func NewAppError(code int, msg string, typ ErrorType, cause error) *AppError {
+	return &AppError{
+		Code:    code,
+		Message: msg,
+		Type:    typ,
+		Cause:   cause,
+	}
+}
+
+func (e *AppError) Error() string {
+	return e.Message
+}
+
+func (e *AppError) Unwrap() error {
+	return e.Cause
+}
+func (e *AppError) Is(target error) bool {
+	if t, ok := target.(*AppError); ok {
+		return e.Type == t.Type
+	}
+	return errors.Is(e.Cause, target)
+}
+
+func (e *AppError) As(target interface{}) bool {
+	if t, ok := target.(**AppError); ok {
+		*t = e
+		return true
+	}
+	return errors.As(e.Cause, target)
+}