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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package obscuretestdata contains functionality used by tests to more easily
// work with testdata that must be obscured primarily due to
// golang.org/issue/34986.
package obscuretestdata
import (
"encoding/base64"
"io"
"os"
)
// Rot13 returns the rot13 encoding or decoding of its input.
func Rot13(data []byte) []byte {
out := make([]byte, len(data))
copy(out, data)
for i, c := range out {
switch {
case 'A' <= c && c <= 'M' || 'a' <= c && c <= 'm':
out[i] = c + 13
case 'N' <= c && c <= 'Z' || 'n' <= c && c <= 'z':
out[i] = c - 13
}
}
return out
}
// DecodeToTempFile decodes the named file to a temporary location.
// If successful, it returns the path of the decoded file.
// The caller is responsible for ensuring that the temporary file is removed.
func DecodeToTempFile(name string) (path string, err error) {
f, err := os.Open(name)
if err != nil {
return "", err
}
defer f.Close()
tmp, err := os.CreateTemp("", "obscuretestdata-decoded-")
if err != nil {
return "", err
}
if _, err := io.Copy(tmp, base64.NewDecoder(base64.StdEncoding, f)); err != nil {
tmp.Close()
os.Remove(tmp.Name())
return "", err
}
if err := tmp.Close(); err != nil {
os.Remove(tmp.Name())
return "", err
}
return tmp.Name(), nil
}
// ReadFile reads the named file and returns its decoded contents.
func ReadFile(name string) ([]byte, error) {
f, err := os.Open(name)
if err != nil {
return nil, err
}
defer f.Close()
return io.ReadAll(base64.NewDecoder(base64.StdEncoding, f))
}
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