Extract GetUserID and ParseID to boilerplate.go in handlers package

handlers/boilerplate.go

@@ -0,0 +1,39 @@
+package handlers
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+)
+
+var (
+	ERROR_UTIL_USERIDER1 = errors.New("internal error 001: UserID not found")
+	ERROR_UTIL_USERIDER2 = errors.New("internal error 002: UserID conversion error")
+)
+
+func GetUserID(c *gin.Context) (uint, error) {
+	userIDAny, exists := c.Get("UserID")
+	if !exists {
+		return 0, ERROR_UTIL_USERIDER1
+	}
+
+	userID, ok := userIDAny.(uint)
+	if !ok {
+		return 0, ERROR_UTIL_USERIDER2
+	}
+	return userID, nil
+}
+
+//
+
+// Parses id as uint
+func ParseID(c *gin.Context) (uint, error) {
+	idStr := c.Param("id")
+	idVal, err := strconv.ParseUint(idStr, 10, 32)
+	if err != nil {
+		return 0, fmt.Errorf("invalid request: %w", err)
+	}
+	return uint(idVal), nil
+}