fix multipart upload merge file

server/internal/library/storager/upload_local_test.go

@@ -0,0 +1,61 @@
+package storager
+
+import (
+	"crypto/md5"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"testing"
+)
+
+func TestMergePartFile(t *testing.T) {
+	srcFile, _ := os.Open("1.zip")
+	defer srcFile.Close()
+	fileInfo, err := srcFile.Stat()
+	if err != nil {
+		t.Error(err)
+	}
+	hash := md5.New()
+	_, err = io.Copy(hash, srcFile)
+	sum := hash.Sum(nil)
+	fileHash := fmt.Sprintf("%x", sum)
+
+	var singleSize = int64(1024 * 1024 * 100)
+	chunks := int(fileInfo.Size() / singleSize)
+	if fileInfo.Size()%singleSize != 0 {
+		chunks += 1
+	}
+	srcFile.Seek(0, io.SeekStart)
+	for j := 0; j < chunks; j++ {
+		partSize := singleSize
+		if j == chunks-1 {
+			partSize = fileInfo.Size() - int64(j)*singleSize
+		}
+		partData := make([]byte, partSize)
+		_, err = io.ReadFull(srcFile, partData)
+		pf, _ := os.Create(fmt.Sprintf("tmp/%d", j+1))
+		_, err = pf.Write(partData)
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		pf.Close()
+	}
+
+	err = MergePartFile("tmp/", "2.zip")
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	f2, _ := os.Open("2.zip")
+	hash2 := md5.New()
+	_, err = io.Copy(hash2, f2)
+	sum2 := hash.Sum(nil)
+	fileHash2 := fmt.Sprintf("%x", sum2)
+	if fileHash != fileHash2 {
+		t.Error(errors.New("hash mismatch"))
+	}
+
+}