WIP: Mobile: bindings

Author: kaloudis

mobile/bindings.go

@@ -0,0 +1,47 @@
+//go:build mobile
+// +build mobile
+
+package mobile
+
+import (
+	"context"
+
+	"github.com/btcsuite/btcd/btcec/v2"
+	"github.com/lightningnetwork/lnd/keychain"
+	"github.com/lightninglabs/lightning-node-connect/mailbox"
+	"google.golang.org/grpc"
+)
+
+// connectMailbox tries to establish a connection through LNC using the given
+// connect phrase and the mailbox server.
+func ConnectMailbox(ctx context.Context,
+	connectPhrase []string, mailboxServerAddr string) (grpc.ClientConnInterface, error) {
+
+	var mnemonicWords [mailbox.NumPassphraseWords]string
+	copy(mnemonicWords[:], connectPhrase)
+	passphrase := mailbox.PassphraseMnemonicToEntropy(mnemonicWords)
+
+	privKey, err := btcec.NewPrivateKey()
+	if err != nil {
+		return nil, err
+	}
+	ecdh := &keychain.PrivKeyECDH{PrivKey: privKey}
+
+	connData := mailbox.NewConnData(ecdh, nil, passphrase[:], nil, nil, nil)
+
+	transportConn, err := mailbox.NewClient(ctx, connData)
+	if err != nil {
+		return nil, err
+	}
+
+	noiseConn := mailbox.NewNoiseGrpcConn(connData)
+
+	dialOpts := []grpc.DialOption{
+		grpc.WithContextDialer(transportConn.Dial),
+		grpc.WithTransportCredentials(noiseConn),
+		grpc.WithPerRPCCredentials(noiseConn),
+		grpc.WithBlock(),
+	}
+
+	return grpc.DialContext(ctx, mailboxServerAddr, dialOpts...)
+}