mpc/examples/solana/main.go

// Copyright (c) 2024-2025 Hanzo AI Inc.
// SPDX-License-Identifier: BSD-3-Clause

// Solana Threshold Signing Example
// Demonstrates threshold EdDSA signing for Solana
package main

import (
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"log"

	"github.com/luxfi/mpc/pkg/threshold"
)

func main() {
	fmt.Println("=== Solana Threshold Signing Example ===")
	fmt.Println()

	// Create unified threshold API
	api := threshold.NewUnifiedThresholdAPI()
	defer api.Close()

	// Define MPC nodes with 2-of-3 threshold
	partyIDs := []string{"validator1", "validator2", "validator3"}
	thresholdValue := 1 // 2-of-3 threshold

	fmt.Println("1. Solana Transaction Signing")
	fmt.Println("   Protocol: FROST (EdDSA on Ed25519)")
	fmt.Println("   Note: Uses Taproot FROST variant for Schnorr compatibility")
	fmt.Println()

	// Initialize EdDSA key generation
	party, err := api.KeyGen(threshold.SchemeEdDSA, "validator1", partyIDs, thresholdValue)
	if err != nil {
		log.Fatalf("Failed to start keygen: %v", err)
	}

	// Example Solana transfer transaction
	tx := &SolanaTransaction{
		RecentBlockhash: "EkSnNWid2cvwEVnVx9aBqawnmiCNiDgp3gUdkDPTKN1N",
		FeePayer:        "9xQeWvG816bUx9EPjHmaT23yvVM2ZWbrrpZb9PusVFin",
		Instructions: []Instruction{
			{
				ProgramID: "11111111111111111111111111111111", // System Program
				Accounts: []AccountMeta{
					{Pubkey: "9xQeWvG816bUx9EPjHmaT23yvVM2ZWbrrpZb9PusVFin", IsSigner: true, IsWritable: true},
					{Pubkey: "2wmVCSfPxGPjrnMMn7rchp4uaeoTqN39mXFC2zhPdri9", IsSigner: false, IsWritable: true},
				},
				Data: encodeTransferInstruction(1_000_000_000), // 1 SOL in lamports
			},
		},
	}

	// Compute transaction hash
	txHash := tx.Hash()

	fmt.Printf("   ✓ Key generation initiated\n")
	fmt.Printf("   ✓ Transaction details:\n")
	fmt.Printf("     - Fee Payer: %s...\n", tx.FeePayer[:16])
	fmt.Printf("     - Recent Blockhash: %s...\n", tx.RecentBlockhash[:16])
	fmt.Printf("     - Instructions: %d\n", len(tx.Instructions))
	fmt.Printf("     - Amount: 1 SOL (1,000,000,000 lamports)\n")
	fmt.Printf("   ✓ TX Hash: %s\n", hex.EncodeToString(txHash[:16])+"...")
	fmt.Printf("   ✓ Threshold: %d-of-%d signers required\n", thresholdValue+1, len(partyIDs))
	fmt.Printf("   ✓ Party status: Done=%v\n", party.Done())
	fmt.Println()

	// Example 2: SPL Token Transfer
	fmt.Println("2. SPL Token Transfer")
	fmt.Println()

	splTx := &SolanaTransaction{
		RecentBlockhash: "EkSnNWid2cvwEVnVx9aBqawnmiCNiDgp3gUdkDPTKN1N",
		FeePayer:        "9xQeWvG816bUx9EPjHmaT23yvVM2ZWbrrpZb9PusVFin",
		Instructions: []Instruction{
			{
				ProgramID: "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA", // SPL Token Program
				Accounts: []AccountMeta{
					{Pubkey: "sourceTokenAccount", IsSigner: false, IsWritable: true},
					{Pubkey: "destTokenAccount", IsSigner: false, IsWritable: true},
					{Pubkey: "ownerPubkey", IsSigner: true, IsWritable: false},
				},
				Data: encodeSPLTransfer(1_000_000), // 1 USDC (6 decimals)
			},
		},
	}

	splHash := splTx.Hash()
	fmt.Printf("   ✓ SPL Token transfer encoded\n")
	fmt.Printf("   ✓ Token Program: TokenkegQfeZyiNwAJbNbGKPFXC...\n")
	fmt.Printf("   ✓ TX Hash: %s\n", hex.EncodeToString(splHash[:16])+"...")
	fmt.Println()

	// Solana ecosystem
	fmt.Println("=== Solana Ecosystem Support ===")
	programs := []struct {
		name      string
		programID string
	}{
		{"System Program", "11111111111111111111111111111111"},
		{"SPL Token", "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"},
		{"Token 2022", "TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb"},
		{"Associated Token", "ATokenGPvbdGVxr1b2hvZbsiqW5xWH25efTNsLJA8knL"},
		{"Memo Program", "MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr"},
	}
	for _, prog := range programs {
		fmt.Printf("   ✓ %s\n", prog.name)
	}
	fmt.Println()

	fmt.Println("=== Solana MPC Benefits ===")
	fmt.Println("   • Native Ed25519 threshold signatures")
	fmt.Println("   • Sub-second transaction finality")
	fmt.Println("   • Support for all SPL tokens")
	fmt.Println("   • DeFi protocol compatibility (Raydium, Jupiter, etc.)")
	fmt.Println("   • NFT marketplace support (Magic Eden, Tensor)")
	fmt.Println()
	fmt.Println("✅ Solana threshold signing ready!")
}

// SolanaTransaction represents a simplified Solana transaction
type SolanaTransaction struct {
	RecentBlockhash string
	FeePayer        string
	Instructions    []Instruction
}

// Instruction represents a Solana instruction
type Instruction struct {
	ProgramID string
	Accounts  []AccountMeta
	Data      []byte
}

// AccountMeta represents account metadata
type AccountMeta struct {
	Pubkey     string
	IsSigner   bool
	IsWritable bool
}

// Hash computes the transaction hash for signing
func (tx *SolanaTransaction) Hash() [32]byte {
	h := sha256.New()
	// Simplified: in production use proper Solana serialization
	h.Write([]byte(tx.RecentBlockhash))
	h.Write([]byte(tx.FeePayer))
	for _, ix := range tx.Instructions {
		h.Write([]byte(ix.ProgramID))
		h.Write(ix.Data)
	}
	var result [32]byte
	copy(result[:], h.Sum(nil))
	return result
}

// encodeTransferInstruction encodes a System Program transfer
func encodeTransferInstruction(lamports uint64) []byte {
	// Instruction: Transfer (index 2)
	data := make([]byte, 12)
	data[0] = 2 // Transfer instruction
	// Little-endian lamports
	for i := 0; i < 8; i++ {
		data[4+i] = byte(lamports >> (i * 8))
	}
	return data
}

// encodeSPLTransfer encodes an SPL Token transfer
func encodeSPLTransfer(amount uint64) []byte {
	// Instruction: Transfer (index 3)
	data := make([]byte, 9)
	data[0] = 3 // Transfer instruction
	// Little-endian amount
	for i := 0; i < 8; i++ {
		data[1+i] = byte(amount >> (i * 8))
	}
	return data
}

// base58Alphabet is the Bitcoin/Solana base58 alphabet
const base58Alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"

// base58Encode encodes data to base58 (simplified implementation)
func base58Encode(data []byte) string {
	if len(data) == 0 {
		return ""
	}
	// Simplified: just return hex for demonstration
	// Production code would use a proper base58 implementation
	return hex.EncodeToString(data)
}