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path: root/names.go
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package main

import (
	"errors"
	"os"
	"path"
	"path/filepath"
	"strings"
)

var ErrNames = errors.New("please use naming scheme of keyname.pub and keyname.sec")

const (
	extPub     = ".pub"
	extSec     = ".sec"
	extSig     = ".sig"
	verifyWith = "verify with "
)

func splitNameExt(fname string) (string, string) {
	_, file := path.Split(fname)
	ext := filepath.Ext(file)
	return file[:len(file)-len(ext)], ext
}

func ValidateNames(pubFile, secFile string) error {
	pubName, pubExt := splitNameExt(pubFile)
	secName, secExt := splitNameExt(secFile)
	if pubExt != extPub || secExt != extSec || pubName != secName {
		return ErrNames
	}
	return nil
}

func PubName(secFile string) string {
	ext := filepath.Ext(secFile)
	return filepath.Base(secFile[:len(ext)-1] + extPub)
}

func SigName(msgFile string) string {
	return msgFile + extSig
}

func CommentPubFile(comment string) string {
	if strings.HasPrefix(comment, verifyWith) {
		file := comment[len(verifyWith):]
		if strings.HasSuffix(file, extPub) {
			return FindFile(file)
		}
	}
	return ""
}

func VerifyWith(secFile string) string {
	return verifyWith + PubName(secFile)
}

var safePath = []string{
	"/etc/signify",
	"$HOME/.signify",
}

// FindFile locates keys in safe path. Falls back to current dir.
func FindFile(fname string) string {
	for _, v := range safePath {
		p := path.Join(os.Expand(v, os.Getenv), fname)
		if _, err := os.Stat(p); err == nil {
			return p
		}
	}
	return fname
}