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919 lines (819 loc) · 27.4 KB
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package outscript
import (
"crypto/ed25519"
"encoding/binary"
"errors"
"fmt"
"io"
"slices"
"sort"
"github.com/KarpelesLab/base58"
)
// SolanaKey is a 32-byte public key used to identify accounts on the Solana network.
type SolanaKey [32]byte
// SolanaSystemProgram is the address of the Solana System Program.
var SolanaSystemProgram = mustParseSolanaKey("11111111111111111111111111111111")
func mustParseSolanaKey(s string) SolanaKey {
k, err := ParseSolanaKey(s)
if err != nil {
panic(err)
}
return k
}
// ParseSolanaKey parses a base58-encoded string into a SolanaKey.
func ParseSolanaKey(s string) (SolanaKey, error) {
buf, err := base58.Bitcoin.Decode(s)
if err != nil {
return SolanaKey{}, fmt.Errorf("failed to decode solana key: %w", err)
}
if len(buf) != 32 {
return SolanaKey{}, fmt.Errorf("invalid solana key: expected 32 bytes, got %d", len(buf))
}
var k SolanaKey
copy(k[:], buf)
return k, nil
}
// String returns the base58 encoding of the key.
func (k SolanaKey) String() string {
return base58.Bitcoin.Encode(k[:])
}
// IsZero reports whether the key is all zeros.
func (k SolanaKey) IsZero() bool {
return k == SolanaKey{}
}
// SolanaAccountMeta describes an account referenced by an instruction.
type SolanaAccountMeta struct {
Pubkey SolanaKey
IsSigner bool
IsWritable bool
}
// SolanaInstruction is a high-level instruction before account compilation.
type SolanaInstruction struct {
ProgramID SolanaKey
Accounts []SolanaAccountMeta
Data []byte
}
// SolanaTransferInstruction returns a System Program transfer instruction
// that moves lamports from one account to another.
func SolanaTransferInstruction(from, to SolanaKey, lamports uint64) SolanaInstruction {
data := make([]byte, 12)
binary.LittleEndian.PutUint32(data[0:4], 2) // Transfer instruction index
binary.LittleEndian.PutUint64(data[4:12], lamports)
return SolanaInstruction{
ProgramID: SolanaSystemProgram,
Accounts: []SolanaAccountMeta{
{Pubkey: from, IsSigner: true, IsWritable: true},
{Pubkey: to, IsSigner: false, IsWritable: true},
},
Data: data,
}
}
// SolanaMessageHeader contains the counts needed to distinguish signer and
// readonly accounts in a transaction message.
type SolanaMessageHeader struct {
NumRequiredSignatures uint8
NumReadonlySignedAccounts uint8
NumReadonlyUnsignedAccounts uint8
}
// SolanaCompiledInstruction is an instruction with account references replaced
// by indices into the message's account key array.
type SolanaCompiledInstruction struct {
ProgramIDIndex uint8
AccountIndices []uint8
Data []byte
}
// SolanaMessage is the message portion of a legacy Solana transaction.
type SolanaMessage struct {
Header SolanaMessageHeader
AccountKeys []SolanaKey
RecentBlockhash SolanaKey
Instructions []SolanaCompiledInstruction
}
// SolanaAddressTableLookup describes a lookup into an address lookup table
// for v0 versioned transactions.
type SolanaAddressTableLookup struct {
AccountKey SolanaKey
WritableIndexes []uint8
ReadonlyIndexes []uint8
}
// SolanaMessageV0 is a versioned (v0) message with address lookup table support.
type SolanaMessageV0 struct {
Header SolanaMessageHeader
AccountKeys []SolanaKey
RecentBlockhash SolanaKey
Instructions []SolanaCompiledInstruction
AddressTableLookups []SolanaAddressTableLookup
}
// SolanaTx represents a Solana transaction (legacy or versioned).
// When MessageV0 is non-nil, the transaction is a v0 versioned transaction.
type SolanaTx struct {
Signatures [][]byte
Message SolanaMessage // used for legacy transactions
MessageV0 *SolanaMessageV0 // non-nil for v0 versioned transactions
}
// solanaAccountInfo tracks the merged permissions for a single account during compilation.
type solanaAccountInfo struct {
key SolanaKey
isSigner bool
isWritable bool
}
// NewSolanaTx compiles a set of high-level instructions into a transaction.
// The fee payer is always placed first in the account list as a writable signer.
func NewSolanaTx(feePayer, recentBlockhash SolanaKey, instructions ...SolanaInstruction) (*SolanaTx, error) {
// Collect and deduplicate accounts, merging permissions.
seen := make(map[SolanaKey]*solanaAccountInfo)
// Fee payer is always signer + writable.
seen[feePayer] = &solanaAccountInfo{key: feePayer, isSigner: true, isWritable: true}
for _, ix := range instructions {
for _, acc := range ix.Accounts {
if info, ok := seen[acc.Pubkey]; ok {
info.isSigner = info.isSigner || acc.IsSigner
info.isWritable = info.isWritable || acc.IsWritable
} else {
seen[acc.Pubkey] = &solanaAccountInfo{
key: acc.Pubkey,
isSigner: acc.IsSigner,
isWritable: acc.IsWritable,
}
}
}
// Program IDs are added as non-signer, readonly (unless already present with higher perms).
if _, ok := seen[ix.ProgramID]; !ok {
seen[ix.ProgramID] = &solanaAccountInfo{
key: ix.ProgramID,
isSigner: false,
isWritable: false,
}
}
}
// Sort accounts into 4 groups:
// 1. signer + writable
// 2. signer + readonly
// 3. non-signer + writable
// 4. non-signer + readonly
// Within each group, maintain stable order (fee payer always first overall).
var signerWritable, signerReadonly, nonsignerWritable, nonsignerReadonly []solanaAccountInfo
for _, info := range seen {
if info.key == feePayer {
continue // handled separately
}
switch {
case info.isSigner && info.isWritable:
signerWritable = append(signerWritable, *info)
case info.isSigner && !info.isWritable:
signerReadonly = append(signerReadonly, *info)
case !info.isSigner && info.isWritable:
nonsignerWritable = append(nonsignerWritable, *info)
default:
nonsignerReadonly = append(nonsignerReadonly, *info)
}
}
// Stable sort each group by key bytes for deterministic ordering.
sortByKey := func(s []solanaAccountInfo) {
sort.SliceStable(s, func(i, j int) bool {
return slices.Compare(s[i].key[:], s[j].key[:]) < 0
})
}
sortByKey(signerWritable)
sortByKey(signerReadonly)
sortByKey(nonsignerWritable)
sortByKey(nonsignerReadonly)
// Build the final account list.
feePayerInfo := *seen[feePayer]
allAccounts := make([]solanaAccountInfo, 0, len(seen))
allAccounts = append(allAccounts, feePayerInfo)
allAccounts = append(allAccounts, signerWritable...)
allAccounts = append(allAccounts, signerReadonly...)
allAccounts = append(allAccounts, nonsignerWritable...)
allAccounts = append(allAccounts, nonsignerReadonly...)
if len(allAccounts) > 256 {
return nil, fmt.Errorf("transaction has %d accounts, maximum is 256", len(allAccounts))
}
// Build index map.
indexMap := make(map[SolanaKey]uint8, len(allAccounts))
accountKeys := make([]SolanaKey, len(allAccounts))
for i, acc := range allAccounts {
indexMap[acc.key] = uint8(i)
accountKeys[i] = acc.key
}
// Compute header counts.
numSigners := 1 + len(signerWritable) + len(signerReadonly) // +1 for fee payer
numReadonlySigned := len(signerReadonly)
numReadonlyUnsigned := len(nonsignerReadonly)
// Compile instructions.
compiled := make([]SolanaCompiledInstruction, len(instructions))
for i, ix := range instructions {
indices := make([]uint8, len(ix.Accounts))
for j, acc := range ix.Accounts {
indices[j] = indexMap[acc.Pubkey]
}
compiled[i] = SolanaCompiledInstruction{
ProgramIDIndex: indexMap[ix.ProgramID],
AccountIndices: indices,
Data: ix.Data,
}
}
msg := SolanaMessage{
Header: SolanaMessageHeader{
NumRequiredSignatures: uint8(numSigners),
NumReadonlySignedAccounts: uint8(numReadonlySigned),
NumReadonlyUnsignedAccounts: uint8(numReadonlyUnsigned),
},
AccountKeys: accountKeys,
RecentBlockhash: recentBlockhash,
Instructions: compiled,
}
return &SolanaTx{
Signatures: make([][]byte, numSigners),
Message: msg,
}, nil
}
// NewSolanaTxV0 compiles a set of high-level instructions into a v0 versioned
// transaction with address lookup table support. The lookups parameter specifies
// which address lookup tables to reference. Accounts resolved through lookup
// tables are not included in the static account key list.
func NewSolanaTxV0(feePayer, recentBlockhash SolanaKey, lookups []SolanaAddressTableLookup, instructions ...SolanaInstruction) (*SolanaTx, error) {
// Compile static accounts the same way as legacy transactions.
seen := make(map[SolanaKey]*solanaAccountInfo)
seen[feePayer] = &solanaAccountInfo{key: feePayer, isSigner: true, isWritable: true}
for _, ix := range instructions {
for _, acc := range ix.Accounts {
if info, ok := seen[acc.Pubkey]; ok {
info.isSigner = info.isSigner || acc.IsSigner
info.isWritable = info.isWritable || acc.IsWritable
} else {
seen[acc.Pubkey] = &solanaAccountInfo{
key: acc.Pubkey,
isSigner: acc.IsSigner,
isWritable: acc.IsWritable,
}
}
}
if _, ok := seen[ix.ProgramID]; !ok {
seen[ix.ProgramID] = &solanaAccountInfo{
key: ix.ProgramID,
isSigner: false,
isWritable: false,
}
}
}
var signerWritable, signerReadonly, nonsignerWritable, nonsignerReadonly []solanaAccountInfo
for _, info := range seen {
if info.key == feePayer {
continue
}
switch {
case info.isSigner && info.isWritable:
signerWritable = append(signerWritable, *info)
case info.isSigner && !info.isWritable:
signerReadonly = append(signerReadonly, *info)
case !info.isSigner && info.isWritable:
nonsignerWritable = append(nonsignerWritable, *info)
default:
nonsignerReadonly = append(nonsignerReadonly, *info)
}
}
sortByKey := func(s []solanaAccountInfo) {
sort.SliceStable(s, func(i, j int) bool {
return slices.Compare(s[i].key[:], s[j].key[:]) < 0
})
}
sortByKey(signerWritable)
sortByKey(signerReadonly)
sortByKey(nonsignerWritable)
sortByKey(nonsignerReadonly)
feePayerInfo := *seen[feePayer]
allAccounts := make([]solanaAccountInfo, 0, len(seen))
allAccounts = append(allAccounts, feePayerInfo)
allAccounts = append(allAccounts, signerWritable...)
allAccounts = append(allAccounts, signerReadonly...)
allAccounts = append(allAccounts, nonsignerWritable...)
allAccounts = append(allAccounts, nonsignerReadonly...)
if len(allAccounts) > 256 {
return nil, fmt.Errorf("transaction has %d accounts, maximum is 256", len(allAccounts))
}
indexMap := make(map[SolanaKey]uint8, len(allAccounts))
accountKeys := make([]SolanaKey, len(allAccounts))
for i, acc := range allAccounts {
indexMap[acc.key] = uint8(i)
accountKeys[i] = acc.key
}
numSigners := 1 + len(signerWritable) + len(signerReadonly)
numReadonlySigned := len(signerReadonly)
numReadonlyUnsigned := len(nonsignerReadonly)
compiled := make([]SolanaCompiledInstruction, len(instructions))
for i, ix := range instructions {
indices := make([]uint8, len(ix.Accounts))
for j, acc := range ix.Accounts {
indices[j] = indexMap[acc.Pubkey]
}
compiled[i] = SolanaCompiledInstruction{
ProgramIDIndex: indexMap[ix.ProgramID],
AccountIndices: indices,
Data: ix.Data,
}
}
msg := &SolanaMessageV0{
Header: SolanaMessageHeader{
NumRequiredSignatures: uint8(numSigners),
NumReadonlySignedAccounts: uint8(numReadonlySigned),
NumReadonlyUnsignedAccounts: uint8(numReadonlyUnsigned),
},
AccountKeys: accountKeys,
RecentBlockhash: recentBlockhash,
Instructions: compiled,
AddressTableLookups: lookups,
}
return &SolanaTx{
Signatures: make([][]byte, numSigners),
MessageV0: msg,
}, nil
}
// messageBytes returns the serialized message bytes, dispatching to the
// correct message version.
func (tx *SolanaTx) messageBytes() ([]byte, error) {
if tx.MessageV0 != nil {
return tx.MessageV0.MarshalBinary()
}
return tx.Message.MarshalBinary()
}
// messageHeader returns the header from the active message version.
func (tx *SolanaTx) messageHeader() SolanaMessageHeader {
if tx.MessageV0 != nil {
return tx.MessageV0.Header
}
return tx.Message.Header
}
// messageAccountKeys returns the static account keys from the active message version.
func (tx *SolanaTx) messageAccountKeys() []SolanaKey {
if tx.MessageV0 != nil {
return tx.MessageV0.AccountKeys
}
return tx.Message.AccountKeys
}
// Sign signs the transaction message with the provided Ed25519 private keys.
// Keys are matched to signature slots by their public key.
func (tx *SolanaTx) Sign(keys ...ed25519.PrivateKey) error {
msgBytes, err := tx.messageBytes()
if err != nil {
return err
}
header := tx.messageHeader()
accountKeys := tx.messageAccountKeys()
numSigners := int(header.NumRequiredSignatures)
if numSigners > len(accountKeys) {
return fmt.Errorf("invalid header: %d required signers but only %d account keys", numSigners, len(accountKeys))
}
for _, key := range keys {
pub := key.Public().(ed25519.PublicKey)
var pubKey SolanaKey
copy(pubKey[:], pub)
idx := -1
for i := 0; i < numSigners; i++ {
if accountKeys[i] == pubKey {
idx = i
break
}
}
if idx < 0 {
return fmt.Errorf("key %s is not a required signer", pubKey)
}
sig := ed25519.Sign(key, msgBytes)
tx.Signatures[idx] = sig
}
return nil
}
// Verify checks that all required signatures are present and valid Ed25519
// signatures over the serialized message.
func (tx *SolanaTx) Verify() error {
msgBytes, err := tx.messageBytes()
if err != nil {
return fmt.Errorf("failed to serialize message: %w", err)
}
header := tx.messageHeader()
accountKeys := tx.messageAccountKeys()
numSigners := int(header.NumRequiredSignatures)
if numSigners > len(accountKeys) {
return fmt.Errorf("invalid header: %d required signers but only %d account keys", numSigners, len(accountKeys))
}
if len(tx.Signatures) < numSigners {
return fmt.Errorf("expected %d signatures, got %d", numSigners, len(tx.Signatures))
}
for i := 0; i < numSigners; i++ {
sig := tx.Signatures[i]
if len(sig) != 64 {
return fmt.Errorf("signature %d is missing or has invalid length %d", i, len(sig))
}
pubkey := accountKeys[i]
if !ed25519.Verify(ed25519.PublicKey(pubkey[:]), msgBytes, sig) {
return fmt.Errorf("signature %d (signer %s) verification failed", i, pubkey)
}
}
return nil
}
// Hash returns the transaction ID, which is the first signature (64 bytes).
func (tx *SolanaTx) Hash() ([]byte, error) {
if len(tx.Signatures) == 0 || len(tx.Signatures[0]) == 0 {
return nil, errors.New("transaction has no signature")
}
return slices.Clone(tx.Signatures[0]), nil
}
// MarshalBinary serializes the transaction into the Solana wire format.
func (tx *SolanaTx) MarshalBinary() ([]byte, error) {
msgBytes, err := tx.messageBytes()
if err != nil {
return nil, err
}
buf := solanaEncodeCompactU16(len(tx.Signatures))
for _, sig := range tx.Signatures {
if len(sig) == 0 {
buf = append(buf, make([]byte, 64)...)
} else {
if len(sig) != 64 {
return nil, fmt.Errorf("invalid signature length: %d", len(sig))
}
buf = append(buf, sig...)
}
}
buf = append(buf, msgBytes...)
return buf, nil
}
// UnmarshalBinary deserializes a transaction from the Solana wire format.
func (tx *SolanaTx) UnmarshalBinary(data []byte) error {
r := data
sigCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading signature count: %w", err)
}
if sigCount > 256 {
return fmt.Errorf("signature count %d exceeds maximum of 256", sigCount)
}
r = r[n:]
tx.Signatures = make([][]byte, sigCount)
for i := 0; i < sigCount; i++ {
if len(r) < 64 {
return io.ErrUnexpectedEOF
}
tx.Signatures[i] = slices.Clone(r[:64])
r = r[64:]
}
// Detect versioned transaction: MSB of first message byte is set.
if len(r) > 0 && r[0]&0x80 != 0 {
version := r[0] & 0x7f
if version != 0 {
return fmt.Errorf("unsupported transaction version: %d", version)
}
tx.MessageV0 = &SolanaMessageV0{}
return tx.MessageV0.UnmarshalBinary(r)
}
return tx.Message.UnmarshalBinary(r)
}
// MarshalBinary serializes the message into the Solana wire format.
func (msg *SolanaMessage) MarshalBinary() ([]byte, error) {
buf := []byte{
msg.Header.NumRequiredSignatures,
msg.Header.NumReadonlySignedAccounts,
msg.Header.NumReadonlyUnsignedAccounts,
}
buf = append(buf, solanaEncodeCompactU16(len(msg.AccountKeys))...)
for _, key := range msg.AccountKeys {
buf = append(buf, key[:]...)
}
buf = append(buf, msg.RecentBlockhash[:]...)
buf = append(buf, solanaEncodeCompactU16(len(msg.Instructions))...)
for _, ix := range msg.Instructions {
buf = append(buf, ix.ProgramIDIndex)
buf = append(buf, solanaEncodeCompactU16(len(ix.AccountIndices))...)
buf = append(buf, ix.AccountIndices...)
buf = append(buf, solanaEncodeCompactU16(len(ix.Data))...)
buf = append(buf, ix.Data...)
}
return buf, nil
}
// UnmarshalBinary deserializes a message from the Solana wire format.
func (msg *SolanaMessage) UnmarshalBinary(data []byte) error {
r := data
if len(r) < 3 {
return io.ErrUnexpectedEOF
}
msg.Header.NumRequiredSignatures = r[0]
msg.Header.NumReadonlySignedAccounts = r[1]
msg.Header.NumReadonlyUnsignedAccounts = r[2]
r = r[3:]
keyCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading account key count: %w", err)
}
if keyCount > 256 {
return fmt.Errorf("account key count %d exceeds maximum of 256", keyCount)
}
r = r[n:]
msg.AccountKeys = make([]SolanaKey, keyCount)
for i := 0; i < keyCount; i++ {
if len(r) < 32 {
return io.ErrUnexpectedEOF
}
copy(msg.AccountKeys[i][:], r[:32])
r = r[32:]
}
if err := validateSolanaHeader(msg.Header, keyCount); err != nil {
return err
}
if len(r) < 32 {
return io.ErrUnexpectedEOF
}
copy(msg.RecentBlockhash[:], r[:32])
r = r[32:]
ixCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading instruction count: %w", err)
}
r = r[n:]
// Sanity cap: every instruction needs at least one byte (the program id
// index), so the count cannot exceed the remaining bytes.
if ixCount > len(r) {
return fmt.Errorf("instruction count %d exceeds remaining bytes %d", ixCount, len(r))
}
msg.Instructions = make([]SolanaCompiledInstruction, ixCount)
for i := 0; i < ixCount; i++ {
if len(r) < 1 {
return io.ErrUnexpectedEOF
}
msg.Instructions[i].ProgramIDIndex = r[0]
r = r[1:]
accCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading account index count: %w", err)
}
r = r[n:]
if len(r) < accCount {
return io.ErrUnexpectedEOF
}
msg.Instructions[i].AccountIndices = slices.Clone(r[:accCount])
r = r[accCount:]
dataLen, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading instruction data length: %w", err)
}
r = r[n:]
if len(r) < dataLen {
return io.ErrUnexpectedEOF
}
msg.Instructions[i].Data = slices.Clone(r[:dataLen])
r = r[dataLen:]
// Validate that program and account indexes reference real account
// keys. For the legacy format the addressable set is exactly the
// static account key list.
if int(msg.Instructions[i].ProgramIDIndex) >= keyCount {
return fmt.Errorf("instruction %d program id index %d out of range (%d account keys)", i, msg.Instructions[i].ProgramIDIndex, keyCount)
}
for _, ai := range msg.Instructions[i].AccountIndices {
if int(ai) >= keyCount {
return fmt.Errorf("instruction %d account index %d out of range (%d account keys)", i, ai, keyCount)
}
}
}
return nil
}
// MarshalBinary serializes the v0 message into the Solana wire format.
// The first byte is 0x80 (version prefix for v0), followed by the message body
// and address table lookups.
func (msg *SolanaMessageV0) MarshalBinary() ([]byte, error) {
buf := []byte{
0x80, // version prefix: 0x80 | 0 = v0
msg.Header.NumRequiredSignatures,
msg.Header.NumReadonlySignedAccounts,
msg.Header.NumReadonlyUnsignedAccounts,
}
buf = append(buf, solanaEncodeCompactU16(len(msg.AccountKeys))...)
for _, key := range msg.AccountKeys {
buf = append(buf, key[:]...)
}
buf = append(buf, msg.RecentBlockhash[:]...)
buf = append(buf, solanaEncodeCompactU16(len(msg.Instructions))...)
for _, ix := range msg.Instructions {
buf = append(buf, ix.ProgramIDIndex)
buf = append(buf, solanaEncodeCompactU16(len(ix.AccountIndices))...)
buf = append(buf, ix.AccountIndices...)
buf = append(buf, solanaEncodeCompactU16(len(ix.Data))...)
buf = append(buf, ix.Data...)
}
buf = append(buf, solanaEncodeCompactU16(len(msg.AddressTableLookups))...)
for _, lookup := range msg.AddressTableLookups {
buf = append(buf, lookup.AccountKey[:]...)
buf = append(buf, solanaEncodeCompactU16(len(lookup.WritableIndexes))...)
buf = append(buf, lookup.WritableIndexes...)
buf = append(buf, solanaEncodeCompactU16(len(lookup.ReadonlyIndexes))...)
buf = append(buf, lookup.ReadonlyIndexes...)
}
return buf, nil
}
// UnmarshalBinary deserializes a v0 message from the Solana wire format.
func (msg *SolanaMessageV0) UnmarshalBinary(data []byte) error {
r := data
// Consume version prefix byte.
if len(r) < 1 {
return io.ErrUnexpectedEOF
}
if r[0]&0x80 == 0 {
return errors.New("not a versioned message: MSB not set")
}
version := r[0] & 0x7f
if version != 0 {
return fmt.Errorf("unsupported message version: %d", version)
}
r = r[1:]
if len(r) < 3 {
return io.ErrUnexpectedEOF
}
msg.Header.NumRequiredSignatures = r[0]
msg.Header.NumReadonlySignedAccounts = r[1]
msg.Header.NumReadonlyUnsignedAccounts = r[2]
r = r[3:]
keyCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading account key count: %w", err)
}
if keyCount > 256 {
return fmt.Errorf("account key count %d exceeds maximum of 256", keyCount)
}
r = r[n:]
msg.AccountKeys = make([]SolanaKey, keyCount)
for i := 0; i < keyCount; i++ {
if len(r) < 32 {
return io.ErrUnexpectedEOF
}
copy(msg.AccountKeys[i][:], r[:32])
r = r[32:]
}
if err := validateSolanaHeader(msg.Header, keyCount); err != nil {
return err
}
if len(r) < 32 {
return io.ErrUnexpectedEOF
}
copy(msg.RecentBlockhash[:], r[:32])
r = r[32:]
ixCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading instruction count: %w", err)
}
r = r[n:]
// Sanity cap: every instruction needs at least one byte (the program id
// index), so the count cannot exceed the remaining bytes.
if ixCount > len(r) {
return fmt.Errorf("instruction count %d exceeds remaining bytes %d", ixCount, len(r))
}
msg.Instructions = make([]SolanaCompiledInstruction, ixCount)
for i := 0; i < ixCount; i++ {
if len(r) < 1 {
return io.ErrUnexpectedEOF
}
msg.Instructions[i].ProgramIDIndex = r[0]
r = r[1:]
accCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading account index count: %w", err)
}
r = r[n:]
if len(r) < accCount {
return io.ErrUnexpectedEOF
}
msg.Instructions[i].AccountIndices = slices.Clone(r[:accCount])
r = r[accCount:]
dataLen, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading instruction data length: %w", err)
}
r = r[n:]
if len(r) < dataLen {
return io.ErrUnexpectedEOF
}
msg.Instructions[i].Data = slices.Clone(r[:dataLen])
r = r[dataLen:]
}
// Address table lookups (v0-specific).
lookupCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading address table lookup count: %w", err)
}
r = r[n:]
// Sanity cap: every lookup needs at least one byte, so the count cannot
// exceed the remaining bytes.
if lookupCount > len(r) {
return fmt.Errorf("address table lookup count %d exceeds remaining bytes %d", lookupCount, len(r))
}
msg.AddressTableLookups = make([]SolanaAddressTableLookup, lookupCount)
for i := 0; i < lookupCount; i++ {
if len(r) < 32 {
return io.ErrUnexpectedEOF
}
copy(msg.AddressTableLookups[i].AccountKey[:], r[:32])
r = r[32:]
wCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading writable indexes count: %w", err)
}
r = r[n:]
if len(r) < wCount {
return io.ErrUnexpectedEOF
}
msg.AddressTableLookups[i].WritableIndexes = slices.Clone(r[:wCount])
r = r[wCount:]
rCount, n, err := solanaDecodeCompactU16(r)
if err != nil {
return fmt.Errorf("reading readonly indexes count: %w", err)
}
r = r[n:]
if len(r) < rCount {
return io.ErrUnexpectedEOF
}
msg.AddressTableLookups[i].ReadonlyIndexes = slices.Clone(r[:rCount])
r = r[rCount:]
}
// Validate instruction indexes. For v0 the addressable account set is the
// static account keys followed by accounts loaded from address lookup
// tables (all writable indexes, then all readonly indexes). The lookup
// counts are only known after the lookups have been parsed, which is why
// this validation happens here rather than during instruction parsing.
addressable := keyCount
for _, l := range msg.AddressTableLookups {
addressable += len(l.WritableIndexes) + len(l.ReadonlyIndexes)
}
for i := range msg.Instructions {
if int(msg.Instructions[i].ProgramIDIndex) >= addressable {
return fmt.Errorf("instruction %d program id index %d out of range (%d addressable accounts)", i, msg.Instructions[i].ProgramIDIndex, addressable)
}
for _, ai := range msg.Instructions[i].AccountIndices {
if int(ai) >= addressable {
return fmt.Errorf("instruction %d account index %d out of range (%d addressable accounts)", i, ai, addressable)
}
}
}
return nil
}
// validateSolanaHeader checks that the message header account counts are
// internally consistent with the number of account keys. This prevents
// out-of-bounds indexing in Sign/Verify when handling a crafted message.
func validateSolanaHeader(h SolanaMessageHeader, numKeys int) error {
if int(h.NumRequiredSignatures) > numKeys {
return fmt.Errorf("NumRequiredSignatures %d exceeds account key count %d", h.NumRequiredSignatures, numKeys)
}
if int(h.NumReadonlySignedAccounts) > int(h.NumRequiredSignatures) {
return fmt.Errorf("NumReadonlySignedAccounts %d exceeds NumRequiredSignatures %d", h.NumReadonlySignedAccounts, h.NumRequiredSignatures)
}
if int(h.NumRequiredSignatures)+int(h.NumReadonlyUnsignedAccounts) > numKeys {
return fmt.Errorf("NumRequiredSignatures + NumReadonlyUnsignedAccounts (%d) exceeds account key count %d", int(h.NumRequiredSignatures)+int(h.NumReadonlyUnsignedAccounts), numKeys)
}
return nil
}
// solanaEncodeCompactU16 encodes an integer as Solana's compact-u16 format.
// Values 0-0x7f use 1 byte, 0x80-0x3fff use 2 bytes, 0x4000-0xffff use 3 bytes.
func solanaEncodeCompactU16(v int) []byte {
if v < 0 || v > 0xffff {
panic("compact-u16 value out of range")
}
if v < 0x80 {
return []byte{byte(v)}
}
if v < 0x4000 {
return []byte{byte(v&0x7f) | 0x80, byte(v >> 7)}
}
return []byte{byte(v&0x7f) | 0x80, byte((v>>7)&0x7f) | 0x80, byte(v >> 14)}
}
// solanaDecodeCompactU16 decodes a compact-u16 value and returns the value,
// number of bytes consumed, and any error.
func solanaDecodeCompactU16(data []byte) (int, int, error) {
if len(data) == 0 {
return 0, 0, io.ErrUnexpectedEOF
}
b0 := data[0]
if b0 < 0x80 {
return int(b0), 1, nil
}
if len(data) < 2 {
return 0, 0, io.ErrUnexpectedEOF
}
b1 := data[1]
if b1 < 0x80 {
// Reject non-canonical encodings: a 2-byte form whose high group is
// zero should have been encoded in a single byte.
if b1 == 0 {
return 0, 0, errors.New("non-canonical compact-u16")
}
return int(b0&0x7f) | int(b1)<<7, 2, nil
}
if len(data) < 3 {
return 0, 0, io.ErrUnexpectedEOF
}
b2 := data[2]
if b2 > 3 {
return 0, 0, errors.New("compact-u16 overflow")
}
// Reject non-canonical encodings: a 3-byte form whose high group is zero
// should have been encoded in two bytes.
if b2 == 0 {
return 0, 0, errors.New("non-canonical compact-u16")
}
return int(b0&0x7f) | int(b1&0x7f)<<7 | int(b2)<<14, 3, nil
}
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