forked from Silverfish/proton-bridge
74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
// Copyright (c) 2021 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ProtonMail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package sum
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import (
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"crypto/sha512"
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"io"
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"os"
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"path/filepath"
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)
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// RecursiveSum computes the sha512 sum of all files in the root directory and descendents.
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// If a skipFile is provided (e.g. the path of a checksum file relative to rootDir), it (and its signature) is ignored.
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func RecursiveSum(rootDir, skipFileName string) ([]byte, error) {
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hash := sha512.New()
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skipFile := filepath.Join(rootDir, skipFileName)
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skipFileSig := skipFile + ".sig"
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if err := filepath.Walk(rootDir, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if info.IsDir() {
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return nil
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}
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// The hashfile itself isn't included in the hash.
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if path == skipFile || path == skipFileSig {
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return nil
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}
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rel, err := filepath.Rel(rootDir, path)
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if err != nil {
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return err
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}
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if _, err := hash.Write([]byte(rel)); err != nil {
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return err
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}
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f, err := os.Open(path) // nolint[gosec]
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if err != nil {
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return err
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}
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if _, err := io.Copy(hash, f); err != nil {
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return err
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}
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return f.Close()
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}); err != nil {
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return nil, err
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}
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return hash.Sum([]byte{}), nil
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}
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