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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package auth
import (
"os"
"path/filepath"
"runtime"
"strings"
"sync"
)
type netrcLine struct {
machine string
login string
password string
}
var (
netrcOnce sync.Once
netrc []netrcLine
netrcErr error
)
func parseNetrc(data string) []netrcLine {
// See https://www.gnu.org/software/inetutils/manual/html_node/The-_002enetrc-file.html
// for documentation on the .netrc format.
var nrc []netrcLine
var l netrcLine
inMacro := false
for _, line := range strings.Split(data, "\n") {
if inMacro {
if line == "" {
inMacro = false
}
continue
}
f := strings.Fields(line)
i := 0
for ; i < len(f)-1; i += 2 {
// Reset at each "machine" token.
// “The auto-login process searches the .netrc file for a machine token
// that matches […]. Once a match is made, the subsequent .netrc tokens
// are processed, stopping when the end of file is reached or another
// machine or a default token is encountered.”
switch f[i] {
case "machine":
l = netrcLine{machine: f[i+1]}
case "default":
break
case "login":
l.login = f[i+1]
case "password":
l.password = f[i+1]
case "macdef":
// “A macro is defined with the specified name; its contents begin with
// the next .netrc line and continue until a null line (consecutive
// new-line characters) is encountered.”
inMacro = true
}
if l.machine != "" && l.login != "" && l.password != "" {
nrc = append(nrc, l)
l = netrcLine{}
}
}
if i < len(f) && f[i] == "default" {
// “There can be only one default token, and it must be after all machine tokens.”
break
}
}
return nrc
}
func netrcPath() (string, error) {
if env := os.Getenv("NETRC"); env != "" {
return env, nil
}
dir, err := os.UserHomeDir()
if err != nil {
return "", err
}
base := ".netrc"
if runtime.GOOS == "windows" {
base = "_netrc"
}
return filepath.Join(dir, base), nil
}
func readNetrc() {
path, err := netrcPath()
if err != nil {
netrcErr = err
return
}
data, err := os.ReadFile(path)
if err != nil {
if !os.IsNotExist(err) {
netrcErr = err
}
return
}
netrc = parseNetrc(string(data))
}
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