refactor: use dependency injection in backend

backend/internal/utils/file_util.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"io"
+	"mime/multipart"
 	"os"
 	"path/filepath"
 	"strings"
@@ -71,3 +72,24 @@ func copyFile(srcFilePath, destFilePath string) error {
 
 	return nil
 }
+
+func SaveFile(file *multipart.FileHeader, dst string) error {
+	src, err := file.Open()
+	if err != nil {
+		return err
+	}
+	defer src.Close()
+
+	if err = os.MkdirAll(filepath.Dir(dst), 0o750); err != nil {
+		return err
+	}
+
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, src)
+	return err
+}

backend/internal/utils/handler_error_util.go

@@ -1,15 +1,23 @@
 package utils
 
 import (
+	"errors"
 	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
 	"log"
 	"net/http"
 	"strings"
 )
 
 func UnknownHandlerError(c *gin.Context, err error) {
-	log.Println(err)
-	c.JSON(http.StatusInternalServerError, gin.H{"error": "Something went wrong"})
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		HandlerError(c, http.StatusNotFound, "Record not found")
+		return
+	} else {
+		log.Println(err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Something went wrong"})
+	}
+
 }
 
 func HandlerError(c *gin.Context, statusCode int, message string) {

backend/internal/utils/paging_util.go

@@ -1,9 +1,7 @@
 package utils
 
 import (
-	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
-	"strconv"
 )
 
 type PaginationResponse struct {
@@ -12,10 +10,7 @@ type PaginationResponse struct {
 	CurrentPage int   `json:"currentPage"`
 }
 
-func Paginate(c *gin.Context, db *gorm.DB, result interface{}) (PaginationResponse, error) {
-	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("limit", "10"))
-
+func Paginate(page int, pageSize int, db *gorm.DB, result interface{}) (PaginationResponse, error) {
 	if page < 1 {
 		page = 1
 	}