/
filehelper.go
101 lines (88 loc) · 2.92 KB
/
filehelper.go
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/*
* Copyright 2023 Venafi, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package util
import (
"errors"
"fmt"
"io"
"os"
"path/filepath"
"go.uber.org/zap"
)
// FileExists returns true if a file exists and is accessible on the given certPath
func FileExists(certPath string) (bool, error) {
_, err := os.Stat(certPath)
if err != nil {
// Certificate does not exist in location. Install
if errors.Is(err, os.ErrNotExist) {
zap.L().Debug("certificate file does not exist at location", zap.String("location", certPath))
return false, nil
}
return false, err
}
return true, nil
}
// WriteFile saves the content in the given location. Creates any folders necessary for this action
func WriteFile(location string, content []byte) error {
dirPath := filepath.Dir(location)
err := os.MkdirAll(dirPath, 0750)
if err != nil {
zap.L().Error("could not create certificate directory path", zap.String("location", location),
zap.Error(err))
return err
}
err = os.WriteFile(location, content, 0600)
if err != nil {
zap.L().Error("could not write certificate to file", zap.String("file", location), zap.Error(err))
return err
}
return nil
}
// CopyFile makes a copy of the given source to the given destination using Go's native copy function io.Copy
func CopyFile(source string, destination string) error {
zap.L().Debug("checking file", zap.String("location", source))
sourceFileStat, err := os.Stat(source)
if err != nil {
zap.L().Error("failed to stat file", zap.String("file", source), zap.Error(err))
return err
}
if !sourceFileStat.Mode().IsRegular() {
m := "file is not a regular file"
zap.L().Error(m, zap.String("file", source))
return fmt.Errorf("%s: %s", m, source)
}
sourceFile, err := os.Create(source)
if err != nil {
zap.L().Error("failed to create/truncate file", zap.String("file", source), zap.Error(err))
return err
}
defer sourceFile.Close()
destinationFile, err := os.Create(destination)
if err != nil {
zap.L().Error("failed to create/truncate file", zap.String("file", destination), zap.Error(err))
return err
}
defer destinationFile.Close()
_, err = io.Copy(destinationFile, sourceFile)
if err != nil {
zap.L().Error("failed to copy file", zap.String("source", source),
zap.String("destination", destination), zap.Error(err))
return err
}
zap.L().Debug("file successfully copied", zap.String("source", source),
zap.String("destination", destination))
return nil
}