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// Package options provides parsing of user-provided onion-csr options
package options
import (
"encoding/hex"
"flag"
"fmt"
"os"
)
const usage = `Usage:
onion-csr -h
onion-csr -d HS_DIR -n NONCE
Options:
-h, --help: Output usage message and exit
-d, --hs-dir: Path to hidden service directory
-n, --ca-nonce: Nonce provided by a certificate authority in hex
`
// Options is a collection of onion-csr options
type Options struct {
HSDir string
CANonce []byte
caNonce string
}
// New parses user-supplied onion-csr options
func New(cmd string, args []string) (opts Options, err error) {
fs := flag.NewFlagSet(cmd, flag.ContinueOnError)
fs.Usage = func() { fmt.Fprintf(os.Stderr, "%s", usage) }
stringOpt(fs, &opts.HSDir, "hs-dir", "d", "")
stringOpt(fs, &opts.caNonce, "ca-nonce", "n", "")
if err = fs.Parse(args); err != nil {
return opts, err
}
if opts.HSDir == "" {
return opts, fmt.Errorf("-d, --hs-dir: must not be an empty string")
}
if opts.CANonce, err = hex.DecodeString(opts.caNonce); err != nil {
return opts, fmt.Errorf("-n, --ca-nonce: %v", err)
}
if len(opts.CANonce) == 0 {
return opts, fmt.Errorf("-n, --ca-nonce: must not be empty string")
}
return opts, err
}
func stringOpt(fs *flag.FlagSet, opt *string, short, long, value string) {
fs.StringVar(opt, short, value, "")
fs.StringVar(opt, long, value, "")
}
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