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