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package key
import (
"errors"
"fmt"
"github.com/adrg/xdg"
"os"
"path/filepath"
"git.samanthony.xyz/hose/util"
)
var (
pubKeyFile = filepath.Join(xdg.DataHome, "hose", "pubkey")
pubKeyFileMode os.FileMode = 0644
privKeyFile = filepath.Join(xdg.DataHome, "hose", "privkey")
privKeyFileMode os.FileMode = 0600
dirMode os.FileMode = 0755
)
// createFile creates a file with the specified permissions and returns it for writing.
// It does not truncate an existing file. If the file already exists, an error is returned.
func createFile(name string, mode os.FileMode) (*os.File, error) {
exists, err := fileExists(name)
if err != nil {
return nil, err // unexpected error.
} else if exists {
return nil, errFileExists(name) // file exists; do not overwrite.
}
// Does not exist; continue;
util.Logf("creating file %s with mode %o", name, mode)
// Create directory.
dir := filepath.Dir(name)
if err := os.MkdirAll(dir, dirMode); err != nil {
return nil, err
}
// Create file.
f, err := os.Create(name)
if err != nil {
return nil, err
}
// Set mode.
if err := f.Chmod(mode); err != nil {
f.Close()
_ = os.Remove(name)
return nil, err
}
return f, nil
}
// fileExists returns a nil error and true/false if a file does/doesn't exist.
// If an error is encountered, a non-nil error is returned.
func fileExists(path string) (bool, error) {
_, err := os.Stat(path)
if errors.Is(err, os.ErrNotExist) {
return false, nil // file doesn't exist.
} else if err != nil {
return false, err // unexpected error.
}
return true, nil // file exists.
}
// errFileExists constructs a 'file already exists' error message.
func errFileExists(path string) error {
return fmt.Errorf("%s: %s", os.ErrExist, path)
}
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