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messages.go
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messages.go
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package messages
import (
"bytes"
"errors"
"fmt"
"math/big"
ffgcrypto "github.com/filefilego/filefilego/crypto"
"github.com/libp2p/go-libp2p/core/crypto"
)
// DataQueryRequest represents a data query message.
type DataQueryRequest struct {
FileHashes [][]byte
FromPeerAddr string
Hash []byte
Timestamp int64
}
// DataQueryResponse represents a data query response.
type DataQueryResponse struct {
FromPeerAddr string
FeesPerByte string
HashDataQueryRequest []byte
PublicKey []byte
Signature []byte
FileHashes [][]byte
FileHashesSizes []uint64
UnavailableFileHashes [][]byte
Timestamp int64
FileMerkleRootHashes [][]byte
FileNames []string
FileFeesPerByte []string
}
// ToDataQueryRequest returns a domain DataQueryRequest object.
func ToDataQueryRequest(dqr *DataQueryRequestProto) DataQueryRequest {
r := DataQueryRequest{
FileHashes: make([][]byte, len(dqr.FileHashes)),
FromPeerAddr: dqr.FromPeerAddr,
Hash: make([]byte, len(dqr.Hash)),
Timestamp: dqr.Timestamp,
}
copy(r.FileHashes, dqr.FileHashes)
copy(r.Hash, dqr.Hash)
return r
}
// ToDataQueryRequestProto returns a protobuf message of DataQueryRequest object.
func ToDataQueryRequestProto(dqr DataQueryRequest) *DataQueryRequestProto {
r := DataQueryRequestProto{
FileHashes: make([][]byte, len(dqr.FileHashes)),
FromPeerAddr: dqr.FromPeerAddr,
Hash: make([]byte, len(dqr.Hash)),
Timestamp: dqr.Timestamp,
}
copy(r.FileHashes, dqr.FileHashes)
copy(r.Hash, dqr.Hash)
return &r
}
// GetHash gets the hash of data query request.
func (dqr DataQueryRequest) GetHash() []byte {
fileHahes := []byte{}
for _, v := range dqr.FileHashes {
fileHahes = append(fileHahes, v...)
}
timestampBytes := big.NewInt(dqr.Timestamp).Bytes()
data := bytes.Join(
[][]byte{
fileHahes,
[]byte(dqr.FromPeerAddr),
timestampBytes,
},
[]byte{},
)
hash := ffgcrypto.Sha256(data)
return hash
}
// Validate a data query request.
func (dqr DataQueryRequest) Validate() error {
if len(dqr.FileHashes) == 0 {
return errors.New("no file hashes in the request")
}
hashRequest := dqr.GetHash()
if !bytes.Equal(hashRequest, dqr.Hash) {
return errors.New("data query request hash mismatch")
}
return nil
}
// ToDataQueryResponse returns a domain DataQueryResponse object.
func ToDataQueryResponse(dqr *DataQueryResponseProto) DataQueryResponse {
r := DataQueryResponse{
FromPeerAddr: dqr.FromPeerAddr,
FeesPerByte: dqr.FeesPerByte,
HashDataQueryRequest: make([]byte, len(dqr.HashDataQueryRequest)),
PublicKey: make([]byte, len(dqr.PublicKey)),
Signature: make([]byte, len(dqr.Signature)),
FileHashes: make([][]byte, len(dqr.FileHashes)),
FileHashesSizes: make([]uint64, len(dqr.FileHashesSizes)),
UnavailableFileHashes: make([][]byte, len(dqr.UnavailableFileHashes)),
Timestamp: dqr.Timestamp,
FileMerkleRootHashes: make([][]byte, len(dqr.FileMerkleRootHashes)),
FileNames: make([]string, len(dqr.FileNames)),
FileFeesPerByte: make([]string, len(dqr.FileFeesPerByte)),
}
copy(r.HashDataQueryRequest, dqr.HashDataQueryRequest)
copy(r.PublicKey, dqr.PublicKey)
copy(r.Signature, dqr.Signature)
copy(r.FileHashes, dqr.FileHashes)
copy(r.FileHashesSizes, dqr.FileHashesSizes)
copy(r.UnavailableFileHashes, dqr.UnavailableFileHashes)
copy(r.FileMerkleRootHashes, dqr.FileMerkleRootHashes)
copy(r.FileNames, dqr.FileNames)
copy(r.FileFeesPerByte, dqr.FileFeesPerByte)
return r
}
// ToDataQueryResponseProto returns a ToDataQueryResponseProto from a doman ToDataQueryResponse.
func ToDataQueryResponseProto(dqr DataQueryResponse) *DataQueryResponseProto {
r := DataQueryResponseProto{
FromPeerAddr: dqr.FromPeerAddr,
FeesPerByte: dqr.FeesPerByte,
HashDataQueryRequest: make([]byte, len(dqr.HashDataQueryRequest)),
PublicKey: make([]byte, len(dqr.PublicKey)),
Signature: make([]byte, len(dqr.Signature)),
FileHashes: make([][]byte, len(dqr.FileHashes)),
FileHashesSizes: make([]uint64, len(dqr.FileHashesSizes)),
UnavailableFileHashes: make([][]byte, len(dqr.UnavailableFileHashes)),
Timestamp: dqr.Timestamp,
FileMerkleRootHashes: make([][]byte, len(dqr.FileMerkleRootHashes)),
FileNames: make([]string, len(dqr.FileNames)),
FileFeesPerByte: make([]string, len(dqr.FileFeesPerByte)),
}
copy(r.HashDataQueryRequest, dqr.HashDataQueryRequest)
copy(r.PublicKey, dqr.PublicKey)
copy(r.Signature, dqr.Signature)
copy(r.FileHashes, dqr.FileHashes)
copy(r.FileHashesSizes, dqr.FileHashesSizes)
copy(r.UnavailableFileHashes, dqr.UnavailableFileHashes)
copy(r.FileMerkleRootHashes, dqr.FileMerkleRootHashes)
copy(r.FileNames, dqr.FileNames)
copy(r.FileFeesPerByte, dqr.FileFeesPerByte)
return &r
}
// GetDownloadContractHash returns the contract hash.
func GetDownloadContractHash(contract *DownloadContractProto) []byte {
fileHahes := []byte{}
for _, v := range contract.FileHashesNeeded {
fileHahes = append(fileHahes, v...)
}
fileSizes := []byte{}
for _, v := range contract.FileHashesNeededSizes {
intToByte := big.NewInt(0).SetUint64(v).Bytes()
fileSizes = append(fileSizes, intToByte...)
}
data := bytes.Join(
[][]byte{
[]byte(contract.VerifierFees),
contract.FileRequesterNodePublicKey,
contract.VerifierPublicKey,
contract.FileHosterResponse.PublicKey,
contract.FileHosterResponse.Signature,
fileHahes,
fileSizes,
},
[]byte{},
)
hash := ffgcrypto.Sha256(data)
return hash
}
// SignDownloadContractProto signs a download contract from the verifiers side.
func SignDownloadContractProto(privateKey crypto.PrivKey, contract *DownloadContractProto) ([]byte, error) {
fileHahes := []byte{}
for _, v := range contract.FileHashesNeeded {
fileHahes = append(fileHahes, v...)
}
fileSizes := []byte{}
for _, v := range contract.FileHashesNeededSizes {
intToByte := big.NewInt(0).SetUint64(v).Bytes()
fileSizes = append(fileSizes, intToByte...)
}
data := bytes.Join(
[][]byte{
[]byte(contract.VerifierFees),
contract.ContractHash,
contract.FileRequesterNodePublicKey,
contract.VerifierPublicKey,
contract.FileHosterResponse.PublicKey,
contract.FileHosterResponse.Signature,
fileHahes,
fileSizes,
},
[]byte{},
)
sig, err := privateKey.Sign(data)
if err != nil {
return nil, fmt.Errorf("failed to sign download contract proto payload: %w", err)
}
return sig, nil
}
// VerifyDownloadContractProto verifies a download contract.
func VerifyDownloadContractProto(publicKeyVerifier crypto.PubKey, contract *DownloadContractProto) (bool, error) {
dataQueryResponse := ToDataQueryResponse(contract.FileHosterResponse)
publicKeyFileHoster, err := ffgcrypto.PublicKeyFromBytes(dataQueryResponse.PublicKey)
if err != nil {
return false, fmt.Errorf("failed to get the public key of the file hoster: %w", err)
}
contractHash := GetDownloadContractHash(contract)
if !bytes.Equal(contractHash, contract.ContractHash) {
return false, errors.New("contract hash has been modified")
}
ok, err := VerifyDataQueryResponse(publicKeyFileHoster, dataQueryResponse)
if !ok || err != nil {
return false, fmt.Errorf("failed to verify data query resonse payload: %w", err)
}
fileHahes := []byte{}
for _, v := range contract.FileHashesNeeded {
fileHahes = append(fileHahes, v...)
}
fileSizes := []byte{}
for _, v := range contract.FileHashesNeededSizes {
intToByte := big.NewInt(0).SetUint64(v).Bytes()
fileSizes = append(fileSizes, intToByte...)
}
data := bytes.Join(
[][]byte{
[]byte(contract.VerifierFees),
contract.ContractHash,
contract.FileRequesterNodePublicKey,
contract.VerifierPublicKey,
contract.FileHosterResponse.PublicKey,
contract.FileHosterResponse.Signature,
fileHahes,
fileSizes,
},
[]byte{},
)
ok, err = publicKeyVerifier.Verify(data, contract.VerifierSignature)
if err != nil {
return false, fmt.Errorf("failed to verify download contract signature using public key: %w", err)
}
return ok, nil
}
// SignDataQueryResponse signs a data query response given the node's private key.
func SignDataQueryResponse(privateKey crypto.PrivKey, response DataQueryResponse) ([]byte, error) {
timestampBytes := big.NewInt(response.Timestamp).Bytes()
fileHahes := []byte{}
for _, v := range response.FileHashes {
fileHahes = append(fileHahes, v...)
}
fileSizes := []byte{}
for _, v := range response.FileHashesSizes {
intToByte := big.NewInt(0).SetUint64(v).Bytes()
fileSizes = append(fileSizes, intToByte...)
}
fileHahesNotFound := []byte{}
for _, v := range response.UnavailableFileHashes {
fileHahesNotFound = append(fileHahesNotFound, v...)
}
fileMerkleRootHahes := []byte{}
for _, v := range response.FileMerkleRootHashes {
fileMerkleRootHahes = append(fileMerkleRootHahes, v...)
}
fileNameBytes := []byte{}
for _, v := range response.FileNames {
fileNameBytes = append(fileNameBytes, []byte(v)...)
}
fileFees := []byte{}
for _, v := range response.FileFeesPerByte {
fileFees = append(fileFees, []byte(v)...)
}
data := bytes.Join(
[][]byte{
[]byte(response.FromPeerAddr),
[]byte(response.FeesPerByte),
response.HashDataQueryRequest,
response.PublicKey,
fileHahes,
fileSizes,
fileHahesNotFound,
timestampBytes,
fileMerkleRootHahes,
fileNameBytes,
fileFees,
},
[]byte{},
)
sig, err := privateKey.Sign(data)
if err != nil {
return nil, fmt.Errorf("failed to sign data query response payload: %w", err)
}
return sig, nil
}
// VerifyDataQueryResponse verifies a data query response messages given the node's public key.
func VerifyDataQueryResponse(publicKey crypto.PubKey, response DataQueryResponse) (bool, error) {
timestampBytes := big.NewInt(response.Timestamp).Bytes()
fileHahes := []byte{}
for _, v := range response.FileHashes {
fileHahes = append(fileHahes, v...)
}
fileSizes := []byte{}
for _, v := range response.FileHashesSizes {
intToByte := big.NewInt(0).SetUint64(v).Bytes()
fileSizes = append(fileSizes, intToByte...)
}
fileHahesNotFound := []byte{}
for _, v := range response.UnavailableFileHashes {
fileHahesNotFound = append(fileHahesNotFound, v...)
}
fileMerkleRootHahes := []byte{}
for _, v := range response.FileMerkleRootHashes {
fileMerkleRootHahes = append(fileMerkleRootHahes, v...)
}
fileNameBytes := []byte{}
for _, v := range response.FileNames {
fileNameBytes = append(fileNameBytes, []byte(v)...)
}
fileFees := []byte{}
for _, v := range response.FileFeesPerByte {
fileFees = append(fileFees, []byte(v)...)
}
data := bytes.Join(
[][]byte{
[]byte(response.FromPeerAddr),
[]byte(response.FeesPerByte),
response.HashDataQueryRequest,
response.PublicKey,
fileHahes,
fileSizes,
fileHahesNotFound,
timestampBytes,
fileMerkleRootHahes,
fileNameBytes,
fileFees,
},
[]byte{},
)
ok, err := publicKey.Verify(data, response.Signature)
if err != nil {
return false, fmt.Errorf("failed to verify data query response signature using public key: %w", err)
}
return ok, nil
}