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package main
import (
"encoding/base32"
"errors"
"fmt"
"net/url"
"strings"
)
// 32 characters for decoding, using RFC 3548.
const TALER_BASE32_CHARACTER_SET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"
func talerBase32Encode(byts []byte) string {
return talerBase32Encoding().EncodeToString(byts)
}
func talerBase32Decode(str string) ([]byte, error) {
decoded, err := talerBase32Encoding().DecodeString(strings.ToUpper(str))
if err != nil {
return nil, err
}
return decoded, nil
}
func talerBase32Encoding() *base32.Encoding {
// 32 characters for decoding, using RFC 3548.
// character set copied from [TALER-EXCHANGE]/src/util/crypto_confirmation.c
return base32.NewEncoding(TALER_BASE32_CHARACTER_SET)
}
func ParseWopid(wopid string) ([]byte, error) {
unescaped, err := url.PathUnescape(wopid)
if err != nil {
fmt.Println("encoding", err)
return nil, errors.New("decoding failed")
}
wopidBytes, err := talerBase32Decode(unescaped)
if err != nil {
return nil, err
}
if len(wopidBytes) != 32 {
err = errors.New("invalid wopid")
fmt.Println("encoding", err)
return nil, err
}
return wopidBytes, nil
}
func FormatWopid(wopid []byte) string {
return url.PathEscape(talerBase32Encode(wopid))
}
func ParseEddsaPubKey(key EddsaPublicKey) ([]byte, error) {
return talerBase32Decode(string(key))
}
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