refactor(backend): remove redundant MD5 hash calculation from UploadFileSlice and streamline file upload logic

backend/internal/controllers/file.go

@@ -4,11 +4,8 @@ import (
 	"backend/internal/models"
 	"backend/internal/services"
 	"backend/internal/utils"
-	"crypto/md5"
 	"encoding/json"
 	"errors"
-	"fmt"
-	"io"
 	"mime/multipart"
 	"time"
 
@@ -91,19 +88,6 @@ func UploadFileSlice(c echo.Context) error {
 	}
 	defer file.Close()
 
-	// 读取文件内容
-	fileBytes, err := io.ReadAll(file)
-	if err != nil {
-		return utils.HTTPErrorHandler(c, err)
-	}
-
-	// 计算 MD5 哈希
-	hash := md5.Sum(fileBytes)
-	// 如果需要十六进制字符串形式
-	hashString := fmt.Sprintf("%x", hash)
-
-	fmt.Printf("hash: %s\n", hashString)
-
 	if err := services.CreateFileSlice(file, r.FileId, r.FileIndex); err != nil {
 		return utils.HTTPErrorHandler(c, err)
 	}

backend/internal/utils/file.go

@@ -5,14 +5,13 @@ import (
 	"crypto/md5"
 	"fmt"
 	"io"
-	"os"
 )
 
 func GetFileId(fileHash string, fileSize int64) string {
 	return fmt.Sprintf("%s_%d", fileHash, fileSize)
 }
 
-func GetFileMd5(file *os.File) (string, error) {
+func GetFileMd5(file io.Reader) (string, error) {
 
 	const bufferSize = 1024 * 1000 // 1MB