fix: make user signup work for the minimum

A lot of work is still to be done ...

internal/pkg/core/context.go

@@ -22,6 +22,18 @@
 
 package core
 
+import "time"
+
 type Context interface {
+	// Context
+	Deadline() (deadline time.Time, ok bool)
+	Done() <-chan struct{}
+	Err() error
+	Value(key any) any
+
+	// Request
+	Bind(obj any) error
+
+	// Response
 	JSON(code int, obj any)
 }

internal/pkg/errno/code.go

@@ -24,18 +24,28 @@ package errno
 
 import "net/http"
 
+type PlatformLevelErrCode string
+
+const (
+	InternalErrorCode    = "InternalError"
+	InvalidParameterCode = "InvalidParameter"
+	AuthFailureCode      = "AuthFailure"
+	ResourceNotFoundCode = "ResourceNotFound"
+	FailedOperationCode  = "FailedOperation"
+)
+
 var (
 	OK = &Errno{HTTP: http.StatusOK, Code: "", Message: ""}
 
 	InternalServerErr = &Errno{
 		HTTP:    http.StatusInternalServerError,
-		Code:    "InternalError",
+		Code:    InternalErrorCode,
 		Message: "Internal server error",
 	}
 
 	PageNotFoundErr = &Errno{
 		HTTP:    http.StatusNotFound,
-		Code:    "ResourceNotFound.PageNotFound",
+		Code:    ErrorCode(ResourceNotFoundCode, "PageNotFound"),
 		Message: "Page not found",
 	}
 )

internal/pkg/errno/errno.go

@@ -28,6 +28,10 @@ type Errno struct {
 	Message string
 }
 
+func ErrorCode(platformErrCode string, resourceErrCode string) string {
+	return platformErrCode + "." + resourceErrCode
+}
+
 // Error implements Error() method in error interface
 func (err *Errno) Error() string {
 	return err.Message