100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
package token
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"os/exec"
|
|
"path/filepath"
|
|
"strings"
|
|
|
|
"github.com/kardianos/osext"
|
|
)
|
|
|
|
var exePath string
|
|
|
|
func init() {
|
|
var err error
|
|
exePath, err = osext.Executable()
|
|
if err != nil {
|
|
panic("failed to detect self path: " + err.Error())
|
|
}
|
|
}
|
|
|
|
// HelperPath takes the configured path to a helper and expands it to
|
|
// a full absolute path that can be executed. If the path is relative then
|
|
// a prefix of "vault token-" will be prepended to the path.
|
|
func HelperPath(path string) string {
|
|
space := strings.Index(path, " ")
|
|
if space == -1 {
|
|
space = len(path)
|
|
}
|
|
|
|
// Get the binary name. If it isn't absolute, prepend "vault token-"
|
|
binary := path[0:space]
|
|
if !filepath.IsAbs(binary) {
|
|
binary = exePath + " token-" + binary
|
|
}
|
|
|
|
// Return the resulting string
|
|
return fmt.Sprintf("%s%s", binary, path[space:])
|
|
}
|
|
|
|
// Helper is the struct that has all the logic for storing and retrieving
|
|
// tokens from the token helper. The API for the helpers is simple: the
|
|
// Path is executed within a shell. The last argument appended will be the
|
|
// operation, which is:
|
|
//
|
|
// * "get" - Read the value of the token and write it to stdout.
|
|
// * "store" - Store the value of the token which is on stdin. Output
|
|
// nothing.
|
|
// * "erase" - Erase the contents stored. Output nothing.
|
|
//
|
|
// Any errors can be written on stdout. If the helper exits with a non-zero
|
|
// exit code then the stderr will be made part of the error value.
|
|
type Helper struct {
|
|
Path string
|
|
}
|
|
|
|
// Erase deletes the contents from the helper.
|
|
func (h *Helper) Erase() error {
|
|
cmd := h.cmd("erase")
|
|
if output, err := cmd.CombinedOutput(); err != nil {
|
|
return fmt.Errorf(
|
|
"Error: %s\n\n%s", err, string(output))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Get gets the token value from the helper.
|
|
func (h *Helper) Get() (string, error) {
|
|
var buf, stderr bytes.Buffer
|
|
cmd := h.cmd("get")
|
|
cmd.Stdout = &buf
|
|
cmd.Stderr = &stderr
|
|
if err := cmd.Run(); err != nil {
|
|
return "", fmt.Errorf(
|
|
"Error: %s\n\n%s", err, stderr.String())
|
|
}
|
|
|
|
return buf.String(), nil
|
|
}
|
|
|
|
// Store stores the token value into the helper.
|
|
func (h *Helper) Store(v string) error {
|
|
buf := bytes.NewBufferString(v)
|
|
cmd := h.cmd("store")
|
|
cmd.Stdin = buf
|
|
if output, err := cmd.CombinedOutput(); err != nil {
|
|
return fmt.Errorf(
|
|
"Error: %s\n\n%s", err, string(output))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (h *Helper) cmd(op string) *exec.Cmd {
|
|
cmd := exec.Command("sh", "-c", h.Path+" "+op)
|
|
return cmd
|
|
}
|