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package utils
import (
"bytes"
"io"
"os"
"unicode"
"github.com/pkg/errors"
"go.step.sm/crypto/internal/utils/utfbom"
)
func maybeUnwrap(err error) error {
if wrapped := errors.Unwrap(err); wrapped != nil {
return wrapped
}
return err
}
// stdinFilename is the name of the file that is used in many command
// line utilities to denote input is to be read from STDIN.
const stdinFilename = "-"
// stdin points to STDIN through os.Stdin.
var stdin = os.Stdin
// ReadFile reads the file identified by filename and returns
// the contents. If filename is equal to "-", it will read from
// STDIN.
func ReadFile(filename string) (b []byte, err error) {
if filename == stdinFilename {
filename = "/dev/stdin"
b, err = io.ReadAll(stdin)
} else {
var contents []byte
contents, err = os.ReadFile(filename)
if err != nil {
return nil, errors.Wrapf(maybeUnwrap(err), "error reading %q", filename)
}
b, err = io.ReadAll(utfbom.SkipOnly(bytes.NewReader(contents)))
}
if err != nil {
return nil, errors.Wrapf(maybeUnwrap(err), "error reading %q", filename)
}
return
}
// ReadPasswordFromFile reads and returns the password from the given filename.
// The contents of the file will be trimmed at the right.
func ReadPasswordFromFile(filename string) ([]byte, error) {
password, err := ReadFile(filename)
if err != nil {
return nil, errors.Wrapf(err, "error reading %s", filename)
}
password = bytes.TrimRightFunc(password, unicode.IsSpace)
return password, nil
}
// WriteFile writes data to a file named by filename.
// If the file does not exist, WriteFile creates it with permissions perm
// (before umask); otherwise WriteFile truncates it before writing.
//
// It wraps os.WriteFile wrapping the errors.
func WriteFile(filename string, data []byte, perm os.FileMode) error {
if err := os.WriteFile(filename, data, perm); err != nil {
return errors.Wrapf(maybeUnwrap(err), "error writing %s", filename)
}
return nil
}
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