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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| // Copyright 2021 The age Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
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| package main | ||
|
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| // This file implements the terminal UI of cmd/age. The rules are: | ||
| // | ||
| // - Anything that requires user interaction goes to the terminal, | ||
| // and is erased afterwards if possible. This UI would be possible | ||
| // to replace with a pinentry with no output or UX changes. | ||
| // | ||
| // - Everything else goes to standard error with an "age:" prefix. | ||
| // No capitalized initials and no periods at the end. | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
| "runtime" | ||
|
|
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| "golang.org/x/term" | ||
| ) | ||
|
|
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| // l is a logger with no prefixes. | ||
| var l = log.New(os.Stderr, "", 0) | ||
|
|
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| func printf(format string, v ...interface{}) { | ||
| l.Printf("age: "+format, v...) | ||
| } | ||
|
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| func errorf(format string, v ...interface{}) { | ||
| l.Printf("age: error: "+format, v...) | ||
| l.Fatalf("age: report unexpected or unhelpful errors at https://filippo.io/age/report") | ||
| } | ||
|
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| func warningf(format string, v ...interface{}) { | ||
| l.Printf("age: warning: "+format, v...) | ||
| } | ||
|
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| func errorWithHint(error string, hints ...string) { | ||
| l.Printf("age: error: %s", error) | ||
| for _, hint := range hints { | ||
| l.Printf("age: hint: %s", hint) | ||
| } | ||
| l.Fatalf("age: report unexpected or unhelpful errors at https://filippo.io/age/report") | ||
| } | ||
|
|
||
| // Terminal escape codes to erase the previous line. | ||
| const ( | ||
| CUI = "\033[" // Control Sequence Introducer | ||
| CPL = CUI + "F" // Cursor Previous Line | ||
| EL = CUI + "K" // Erase in Line | ||
| CHA = CUI + "G" // Cursor Horizontal Absolute | ||
| ) | ||
|
|
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| // readSecret reads a value from the terminal with no echo. The prompt is | ||
| // ephemeral. readSecret does not read from a non-terminal stdin, so it does not | ||
| // check stdinInUse. | ||
| func readSecret(prompt string) ([]byte, error) { | ||
| var in, out *os.File | ||
| if runtime.GOOS == "windows" { | ||
| var err error | ||
| in, err = os.OpenFile("CONIN$", os.O_RDWR, 0) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer in.Close() | ||
| out, err = os.OpenFile("CONOUT$", os.O_WRONLY, 0) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer out.Close() | ||
| } else if tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0); err == nil { | ||
| defer tty.Close() | ||
| in, out = tty, tty | ||
| } else { | ||
| if !term.IsTerminal(int(os.Stdin.Fd())) { | ||
| return nil, fmt.Errorf("standard input is not a terminal, and /dev/tty is not available: %v", err) | ||
| } | ||
| in, out = os.Stdin, os.Stderr | ||
| } | ||
|
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| fmt.Fprintf(out, "%s ", prompt) | ||
|
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| // First, open a new line (since the return character is not echoed, like | ||
| // the password), which is guaranteed to work everywhere. Then, try to erase | ||
| // the line above with escape codes. (We use CRLF instead of LF to work | ||
| // around an apparent bug in WSL2's handling of CONOUT$. Only when running a | ||
| // Windows binary from WSL2, the cursor would not go back to the start of | ||
| // the line with a simple LF. Honestly, it's impressive CONIN$ and CONOUT$ | ||
| // even work at all inside WSL2.) | ||
| defer fmt.Fprintf(out, "\r\n"+CPL+EL) | ||
|
|
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| return term.ReadPassword(int(in.Fd())) | ||
| } | ||
|
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| func pluginDisplayMessage(name string) func(string) error { | ||
| return func(message string) error { | ||
| printf("%s plugin: %s", name, message) | ||
| return nil | ||
| } | ||
| } | ||
|
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| func pluginRequestSecret(name string) func(string, bool) (string, error) { | ||
| return func(message string, _ bool) (string, error) { | ||
| secret, err := readSecret(message) | ||
| if err != nil { | ||
| return "", fmt.Errorf("could not read value for age-plugin-%s: %v", name, err) | ||
| } | ||
| return string(secret), nil | ||
| } | ||
| } |
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