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https://github.com/octoleo/syncthing.git
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f4372710bf
This is a mostly pointless change to make security scanners and static analysis tools happy, as they all hate seeing md5. None of our md5 uses were security relevant, but still. Only visible effect of this change is that our temp file names for very long file names become slightly longer than they were previously...
63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
// Copyright (C) 2015 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package fs
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import (
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"fmt"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/syncthing/syncthing/lib/sha256"
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)
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const (
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WindowsTempPrefix = "~syncthing~"
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UnixTempPrefix = ".syncthing."
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)
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var TempPrefix string
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// Real filesystems usually handle 255 bytes. encfs has varying and
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// confusing file name limits. We take a safe way out and switch to hashing
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// quite early.
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const maxFilenameLength = 160 - len(UnixTempPrefix) - len(".tmp")
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func init() {
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if runtime.GOOS == "windows" {
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TempPrefix = WindowsTempPrefix
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} else {
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TempPrefix = UnixTempPrefix
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}
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}
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// IsTemporary is true if the file name has the temporary prefix. Regardless
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// of the normally used prefix, the standard Windows and Unix temp prefixes
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// are always recognized as temp files.
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func IsTemporary(name string) bool {
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name = filepath.Base(name)
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if strings.HasPrefix(name, WindowsTempPrefix) ||
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strings.HasPrefix(name, UnixTempPrefix) {
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return true
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}
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return false
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}
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func TempNameWithPrefix(name, prefix string) string {
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tdir := filepath.Dir(name)
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tbase := filepath.Base(name)
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if len(tbase) > maxFilenameLength {
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tbase = fmt.Sprintf("%x", sha256.Sum256([]byte(name)))
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}
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tname := fmt.Sprintf("%s%s.tmp", prefix, tbase)
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return filepath.Join(tdir, tname)
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}
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func TempName(name string) string {
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return TempNameWithPrefix(name, TempPrefix)
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}
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