fix: prevent path traversal in GetFile endpoint

Signed-off-by: tranquac <tranquac@users.noreply.github.com>

api/v1/file_controller.go

@@ -2,6 +2,7 @@ package v1
 
 import (
 	"io/ioutil"
+	"path/filepath"
 	"net/http"
 	"strings"
 
@@ -18,7 +19,20 @@ import (
 func GetFile(c *gin.Context) {
 	fileName := c.Param("fileName")
 	log.Logger.Info(fileName)
-	data, _ := ioutil.ReadFile(config.GetConfig().StaticPath.FilePath + fileName)
+
+	// Prevent path traversal by extracting only the base filename
+	fileName = filepath.Base(fileName)
+	if fileName == "." || fileName == "/" {
+		c.JSON(http.StatusBadRequest, response.FailMsg("invalid file name"))
+		return
+	}
+
+	filePath := filepath.Join(config.GetConfig().StaticPath.FilePath, fileName)
+	data, err := ioutil.ReadFile(filePath)
+	if err != nil {
+		c.JSON(http.StatusNotFound, response.FailMsg("file not found"))
+		return
+	}
 	c.Writer.Write(data)
 }