mirror of https://github.com/perkeep/perkeep.git
100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package pinentry
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import (
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"bufio"
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"exec"
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"fmt"
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"log"
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"os"
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"strings"
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)
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var _ = log.Printf
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type Request struct {
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Desc, Prompt, OK, Cancel, Error string
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}
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func (r *Request) GetPIN() (pin string, outerr os.Error) {
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defer func() {
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if e, ok := recover().(string); ok {
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pin = ""
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outerr = os.NewError(e)
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}
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}()
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c, err := exec.Run("/usr/bin/pinentry",
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[]string{"/usr/bin/pinentry"},
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os.Environ(),
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"/",
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exec.Pipe,
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exec.Pipe,
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exec.DevNull)
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if err != nil {
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return "", err
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}
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defer func() {
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c.Stdin.Close()
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c.Stdout.Close()
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c.Close()
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c.Wait(0)
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}()
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br := bufio.NewReader(c.Stdout)
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lineb, _, err := br.ReadLine()
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if err != nil {
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return "", fmt.Errorf("Failed to get getpin greeting")
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}
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line := string(lineb)
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if !strings.HasPrefix(line, "OK") {
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return "", fmt.Errorf("getpin greeting said %q", line)
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}
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set := func(cmd string, val string) {
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if val == "" {
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return
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}
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fmt.Fprintf(c.Stdin, "%s %s\n", cmd, val)
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line, _, err := br.ReadLine()
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if err != nil {
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panic("Failed to " + cmd)
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}
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if string(line) != "OK" {
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panic("Response to " + cmd + " was " + string(line))
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}
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}
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set("SETPROMPT", r.Prompt)
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set("SETDESC", r.Desc)
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set("SETOK", r.OK)
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set("SETCANCEL", r.Cancel)
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set("SETERROR", r.Error)
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set("OPTION", "ttytype=" + os.Getenv("TERM"))
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tty, err := os.Readlink("/proc/self/fd/0")
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if err == nil {
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set("OPTION", "ttyname=" + tty)
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}
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fmt.Fprintf(c.Stdin, "GETPIN\n")
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lineb, _, err = br.ReadLine()
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if err != nil {
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return "", fmt.Errorf("Failed to read line after GETPIN: %v", err)
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}
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line = string(lineb)
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if !strings.HasPrefix(line, "D ") {
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return "", os.NewError("GETPIN response didn't start with D")
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}
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return line[2:], nil
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}
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