Andy DixonandClaude
69f4b90777
oracle/go is the Go code at 4c1507c, moved unchanged, plus test-only
generators that record what it computes. tests/vectors holds the
deterministic crypto/store vectors and synthetic fixtures they produce.
Co-Authored-By: Claude <noreply@anthropic.com>
109 lines
3.2 KiB
Go
109 lines
3.2 KiB
Go
package term
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import (
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"bufio"
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"fmt"
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"os"
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"runtime"
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"strings"
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"golang.org/x/term"
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)
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// enableVirtualTerminalProcessing tries to enable virtual terminal processing
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// on Windows. If it fails, avoid using escape sequences to prevent weird
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// characters being printed to the console.
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var enableVirtualTerminalProcessing func(out *os.File) error
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// clearLine clears the current line on the terminal, or opens a new line if
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// terminal escape codes don't work.
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func clearLine(out *os.File) {
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const (
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CUI = "\033[" // Control Sequence Introducer
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CPL = CUI + "F" // Cursor Previous Line
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EL = CUI + "K" // Erase in Line
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)
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// First, open a new line, which is guaranteed to work everywhere. Then, try
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// to erase the line above with escape codes, if possible.
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//
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// (We use CRLF instead of LF to work around an apparent bug in WSL2's
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// handling of CONOUT$. Only when running a Windows binary from WSL2, the
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// cursor would not go back to the start of the line with a simple LF.
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// Honestly, it's impressive CONIN$ and CONOUT$ work at all inside WSL2.)
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fmt.Fprintf(out, "\r\n")
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if enableVirtualTerminalProcessing == nil || enableVirtualTerminalProcessing(out) == nil {
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fmt.Fprintf(out, CPL+EL)
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}
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}
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// WithTerminal runs f with the terminal input and output files, if available.
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// WithTerminal does not open a non-terminal stdin, so the caller does not need
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// to check if stdin is in use.
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func WithTerminal(f func(in, out *os.File) error) error {
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if runtime.GOOS == "windows" {
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in, err := os.OpenFile("CONIN$", os.O_RDWR, 0)
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if err != nil {
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return err
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}
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defer in.Close()
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out, err := os.OpenFile("CONOUT$", os.O_WRONLY, 0)
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if err != nil {
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return err
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}
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defer out.Close()
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return f(in, out)
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} else if tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0); err == nil {
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defer tty.Close()
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return f(tty, tty)
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} else if term.IsTerminal(int(os.Stdin.Fd())) {
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return f(os.Stdin, os.Stdin)
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} else {
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return fmt.Errorf("standard input is not a terminal, and /dev/tty is not available: %v", err)
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}
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}
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// ReadSecret reads a value from the terminal with no echo. The prompt is ephemeral.
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func ReadSecret(prompt string) (s []byte, err error) {
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err = WithTerminal(func(in, out *os.File) error {
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fmt.Fprintf(out, "%s ", prompt)
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defer clearLine(out)
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s, err = term.ReadPassword(int(in.Fd()))
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return err
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})
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return
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}
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// Confirm asks a yes/no question on the terminal. Only "y" or "yes" is yes.
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func Confirm(prompt string) (yes bool, err error) {
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err = WithTerminal(func(in, out *os.File) error {
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fmt.Fprintf(out, "%s ", prompt)
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line, err := bufio.NewReader(in).ReadString('\n')
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if err != nil && line == "" {
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return err
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}
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switch strings.ToLower(strings.TrimSpace(line)) {
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case "y", "yes":
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yes = true
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}
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return nil
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})
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return
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}
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// ReadPassphrase returns the passphrase from the environment variable env if
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// it is set, otherwise prompts on the terminal.
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func ReadPassphrase(prompt, env string) (string, error) {
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if p, ok := os.LookupEnv(env); ok {
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if p == "" {
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return "", fmt.Errorf("%s is set but empty", env)
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}
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return p, nil
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}
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p, err := ReadSecret(prompt)
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if err != nil {
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return "", fmt.Errorf("could not read passphrase (set %s for non-interactive use): %v", env, err)
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}
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return string(p), nil
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}
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