Add NWC protocol handling and NIP-44 encryption and decryption functions.

pkg/protocol/nwc/uri.go

@@ -0,0 +1,81 @@
+package nwc
+
+import (
+	"errors"
+	"net/url"
+
+	"lol.mleku.dev/chk"
+	"next.orly.dev/pkg/crypto/encryption"
+	"next.orly.dev/pkg/crypto/p256k"
+	"next.orly.dev/pkg/interfaces/signer"
+)
+
+type ConnectionParams struct {
+	clientSecretKey signer.I
+	walletPublicKey []byte
+	conversationKey []byte
+	relay           string
+}
+
+// GetWalletPublicKey returns the wallet public key from the ConnectionParams.
+func (c *ConnectionParams) GetWalletPublicKey() []byte {
+	return c.walletPublicKey
+}
+
+// GetConversationKey returns the conversation key from the ConnectionParams.
+func (c *ConnectionParams) GetConversationKey() []byte {
+	return c.conversationKey
+}
+
+func ParseConnectionURI(nwcUri string) (parts *ConnectionParams, err error) {
+	var p *url.URL
+	if p, err = url.Parse(nwcUri); chk.E(err) {
+		return
+	}
+	if p == nil {
+		err = errors.New("invalid uri")
+		return
+	}
+	parts = &ConnectionParams{}
+	if p.Scheme != "nostr+walletconnect" {
+		err = errors.New("incorrect scheme")
+		return
+	}
+	if parts.walletPublicKey, err = p256k.HexToBin(p.Host); chk.E(err) {
+		err = errors.New("invalid public key")
+		return
+	}
+	query := p.Query()
+	var ok bool
+	var relay []string
+	if relay, ok = query["relay"]; !ok {
+		err = errors.New("missing relay parameter")
+		return
+	}
+	if len(relay) == 0 {
+		return nil, errors.New("no relays")
+	}
+	parts.relay = relay[0]
+	var secret string
+	if secret = query.Get("secret"); secret == "" {
+		err = errors.New("missing secret parameter")
+		return
+	}
+	var secretBytes []byte
+	if secretBytes, err = p256k.HexToBin(secret); chk.E(err) {
+		err = errors.New("invalid secret")
+		return
+	}
+	clientKey := &p256k.Signer{}
+	if err = clientKey.InitSec(secretBytes); chk.E(err) {
+		return
+	}
+	parts.clientSecretKey = clientKey
+	if parts.conversationKey, err = encryption.GenerateConversationKeyWithSigner(
+		clientKey,
+		parts.walletPublicKey,
+	); chk.E(err) {
+		return
+	}
+	return
+}