mirror of https://github.com/status-im/go-waku.git
93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
package noise
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import (
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"crypto/ed25519"
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"encoding/base64"
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"errors"
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"strings"
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)
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type QR struct {
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applicationName string
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applicationVersion string
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shardID string
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ephemeralPublicKey ed25519.PublicKey
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committedStaticKey []byte
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}
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func NewQR(applicationName, applicationVersion, shardID string, ephemeralKey ed25519.PublicKey, committedStaticKey []byte) QR {
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return QR{
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applicationName: applicationName,
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applicationVersion: applicationVersion,
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shardID: shardID,
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ephemeralPublicKey: ephemeralKey,
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committedStaticKey: committedStaticKey,
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}
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}
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// Serializes input parameters to a base64 string for exposure through QR code (used by WakuPairing)
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func (qr QR) String() string {
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return base64.URLEncoding.EncodeToString([]byte(qr.applicationName)) + ":" +
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base64.URLEncoding.EncodeToString([]byte(qr.applicationVersion)) + ":" +
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base64.URLEncoding.EncodeToString([]byte(qr.shardID)) + ":" +
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base64.URLEncoding.EncodeToString(qr.ephemeralPublicKey) + ":" +
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base64.URLEncoding.EncodeToString(qr.committedStaticKey[:])
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}
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func (qr QR) Bytes() []byte {
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return []byte(qr.String())
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}
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func decodeBase64String(inputValue string) ([]byte, error) {
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enc := base64.StdEncoding
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if strings.ContainsAny(inputValue, "-_") {
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enc = base64.URLEncoding
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}
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if len(inputValue)%4 != 0 {
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enc = enc.WithPadding(base64.NoPadding)
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}
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return enc.DecodeString(inputValue)
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}
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// StringToQR deserializes input string in base64 to the corresponding (applicationName, applicationVersion, shardId, ephemeralKey, committedStaticKey)
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func StringToQR(qrString string) (QR, error) {
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values := strings.Split(qrString, ":")
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if len(values) != 5 {
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return QR{}, errors.New("invalid qr string")
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}
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applicationName, err := decodeBase64String(values[0])
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if err != nil {
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return QR{}, err
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}
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applicationVersion, err := decodeBase64String(values[1])
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if err != nil {
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return QR{}, err
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}
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shardID, err := decodeBase64String(values[2])
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if err != nil {
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return QR{}, err
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}
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ephemeralKey, err := decodeBase64String(values[3])
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if err != nil {
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return QR{}, err
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}
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committedStaticKey, err := decodeBase64String(values[4])
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if err != nil {
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return QR{}, err
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}
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return QR{
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applicationName: string(applicationName),
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applicationVersion: string(applicationVersion),
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shardID: string(shardID),
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ephemeralPublicKey: ephemeralKey,
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committedStaticKey: committedStaticKey,
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}, nil
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}
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