110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
package gopass
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import (
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"errors"
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"fmt"
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"io"
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"os"
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)
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type FdReader interface {
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io.Reader
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Fd() uintptr
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}
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var defaultGetCh = func(r io.Reader) (byte, error) {
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buf := make([]byte, 1)
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if n, err := r.Read(buf); n == 0 || err != nil {
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if err != nil {
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return 0, err
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}
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return 0, io.EOF
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}
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return buf[0], nil
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}
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var (
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maxLength = 512
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ErrInterrupted = errors.New("interrupted")
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ErrMaxLengthExceeded = fmt.Errorf("maximum byte limit (%v) exceeded", maxLength)
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// Provide variable so that tests can provide a mock implementation.
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getch = defaultGetCh
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)
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// getPasswd returns the input read from terminal.
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// If prompt is not empty, it will be output as a prompt to the user
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// If masked is true, typing will be matched by asterisks on the screen.
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// Otherwise, typing will echo nothing.
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func getPasswd(prompt string, masked bool, r FdReader, w io.Writer) ([]byte, error) {
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var err error
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var pass, bs, mask []byte
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if masked {
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bs = []byte("\b \b")
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mask = []byte("*")
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}
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if isTerminal(r.Fd()) {
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if oldState, err := makeRaw(r.Fd()); err != nil {
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return pass, err
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} else {
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defer func() {
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restore(r.Fd(), oldState)
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fmt.Fprintln(w)
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}()
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}
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}
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if prompt != "" {
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fmt.Fprint(w, prompt)
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}
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// Track total bytes read, not just bytes in the password. This ensures any
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// errors that might flood the console with nil or -1 bytes infinitely are
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// capped.
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var counter int
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for counter = 0; counter <= maxLength; counter++ {
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if v, e := getch(r); e != nil {
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err = e
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break
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} else if v == 127 || v == 8 {
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if l := len(pass); l > 0 {
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pass = pass[:l-1]
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fmt.Fprint(w, string(bs))
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}
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} else if v == 13 || v == 10 {
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break
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} else if v == 3 {
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err = ErrInterrupted
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break
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} else if v != 0 {
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pass = append(pass, v)
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fmt.Fprint(w, string(mask))
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}
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}
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if counter > maxLength {
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err = ErrMaxLengthExceeded
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}
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return pass, err
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}
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// GetPasswd returns the password read from the terminal without echoing input.
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// The returned byte array does not include end-of-line characters.
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func GetPasswd() ([]byte, error) {
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return getPasswd("", false, os.Stdin, os.Stdout)
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}
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// GetPasswdMasked returns the password read from the terminal, echoing asterisks.
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// The returned byte array does not include end-of-line characters.
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func GetPasswdMasked() ([]byte, error) {
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return getPasswd("", true, os.Stdin, os.Stdout)
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}
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// GetPasswdPrompt prompts the user and returns the password read from the terminal.
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// If mask is true, then asterisks are echoed.
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// The returned byte array does not include end-of-line characters.
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func GetPasswdPrompt(prompt string, mask bool, r FdReader, w io.Writer) ([]byte, error) {
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return getPasswd(prompt, mask, r, w)
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}
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