prepare for complete rewrite

Former-commit-id: f4f1444e244d78dda4453051842d068106ef1fb7

http_checksum.go

@@ -1,50 +0,0 @@
-package filemanager
-
-import (
-	"crypto/md5"
-	"crypto/sha1"
-	"crypto/sha256"
-	"crypto/sha512"
-	"encoding/hex"
-	"errors"
-	"hash"
-	"io"
-	"net/http"
-	"os"
-)
-
-// checksum calculates the hash of a filemanager. Supports MD5, SHA1, SHA256 and SHA512.
-func (c *FileManager) checksum(w http.ResponseWriter, r *http.Request, i *fileInfo) (int, error) {
-	query := r.URL.Query().Get("checksum")
-
-	file, err := os.Open(i.Path)
-	if err != nil {
-		return errorToHTTPCode(err, true), err
-	}
-
-	defer file.Close()
-
-	var h hash.Hash
-
-	switch query {
-	case "md5":
-		h = md5.New()
-	case "sha1":
-		h = sha1.New()
-	case "sha256":
-		h = sha256.New()
-	case "sha512":
-		h = sha512.New()
-	default:
-		return http.StatusBadRequest, errors.New("Unknown HASH type")
-	}
-
-	_, err = io.Copy(h, file)
-	if err != nil {
-		return http.StatusInternalServerError, err
-	}
-
-	val := hex.EncodeToString(h.Sum(nil))
-	w.Write([]byte(val))
-	return http.StatusOK, nil
-}