230 lines
6.8 KiB
Go
230 lines
6.8 KiB
Go
// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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package consensus
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import (
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"fmt"
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coreerr "dappco.re/go/core/log"
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"dappco.re/go/core/blockchain/config"
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"dappco.re/go/core/blockchain/types"
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"dappco.re/go/core/blockchain/wire"
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)
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// ValidateTransaction performs semantic validation on a regular (non-coinbase)
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// transaction. Checks are ordered to match the C++ validate_tx_semantic().
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func ValidateTransaction(tx *types.Transaction, txBlob []byte, forks []config.HardFork, height uint64) error {
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hf4Active := config.IsHardForkActive(forks, config.HF4Zarcanum, height)
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hf5Active := config.IsHardForkActive(forks, config.HF5, height)
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// 0. Transaction version.
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if err := checkTxVersion(tx, forks, height); err != nil {
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return err
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}
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// 1. Blob size.
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if uint64(len(txBlob)) >= config.MaxTransactionBlobSize {
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return coreerr.E("ValidateTransaction", fmt.Sprintf("%d bytes", len(txBlob)), ErrTxTooLarge)
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}
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// 2. Input count.
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if len(tx.Vin) == 0 {
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return ErrNoInputs
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}
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if uint64(len(tx.Vin)) > config.TxMaxAllowedInputs {
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return coreerr.E("ValidateTransaction", fmt.Sprintf("%d", len(tx.Vin)), ErrTooManyInputs)
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}
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hf1Active := config.IsHardForkActive(forks, config.HF1, height)
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// 3. Input types — TxInputGenesis not allowed in regular transactions.
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if err := checkInputTypes(tx, hf1Active, hf4Active); err != nil {
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return err
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}
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// 4. Output validation.
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if err := checkOutputs(tx, hf1Active, hf4Active); err != nil {
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return err
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}
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// 4a. HF5 asset operation validation inside extra.
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if err := checkAssetOperations(tx.Extra, hf5Active); err != nil {
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return err
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}
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// 5. Money overflow.
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if _, err := sumInputs(tx); err != nil {
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return err
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}
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if _, err := sumOutputs(tx); err != nil {
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return err
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}
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// 6. Key image uniqueness.
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if err := checkKeyImages(tx); err != nil {
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return err
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}
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// 7. Balance check (pre-HF4 only — post-HF4 uses commitment proofs).
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if !hf4Active {
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if _, err := TxFee(tx); err != nil {
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return err
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}
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}
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return nil
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}
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// checkTxVersion validates that the transaction version is appropriate for the
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// current hardfork era.
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//
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// Pre-HF4: regular transactions must use version 1.
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// HF4 era: regular transactions must use version 2.
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// HF5+: transaction version must be exactly version 3 and the embedded
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// hardfork_id must match the active hardfork version.
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func checkTxVersion(tx *types.Transaction, forks []config.HardFork, height uint64) error {
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hf5Active := config.IsHardForkActive(forks, config.HF5, height)
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hf4Active := config.IsHardForkActive(forks, config.HF4Zarcanum, height)
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currentFork := config.VersionAtHeight(forks, height)
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var expectedVersion uint64
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switch {
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case hf5Active:
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expectedVersion = types.VersionPostHF5
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case hf4Active:
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expectedVersion = types.VersionPostHF4
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default:
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expectedVersion = types.VersionPreHF4
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}
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if tx.Version != expectedVersion {
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return coreerr.E("checkTxVersion",
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fmt.Sprintf("version %d invalid at height %d (expected %d)", tx.Version, height, expectedVersion),
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ErrTxVersionInvalid)
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}
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if tx.Version >= types.VersionPostHF5 && tx.HardforkID != currentFork {
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return coreerr.E("checkTxVersion",
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fmt.Sprintf("hardfork id %d does not match active fork %d at height %d", tx.HardforkID, currentFork, height),
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ErrTxVersionInvalid)
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}
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return nil
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}
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func checkInputTypes(tx *types.Transaction, hf1Active, hf4Active bool) error {
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for _, vin := range tx.Vin {
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switch vin.(type) {
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case types.TxInputToKey:
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// Always valid.
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case types.TxInputGenesis:
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return coreerr.E("checkInputTypes", "txin_gen in regular transaction", ErrInvalidInputType)
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case types.TxInputHTLC, types.TxInputMultisig:
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// HTLC and multisig inputs require at least HF1.
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if !hf1Active {
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return coreerr.E("checkInputTypes", fmt.Sprintf("tag %d pre-HF1", vin.InputType()), ErrInvalidInputType)
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}
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default:
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// Future types (ZC) — accept if HF4+.
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if !hf4Active {
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return coreerr.E("checkInputTypes", fmt.Sprintf("tag %d pre-HF4", vin.InputType()), ErrInvalidInputType)
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}
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}
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}
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return nil
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}
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func checkOutputs(tx *types.Transaction, hf1Active, hf4Active bool) error {
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if len(tx.Vout) == 0 {
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return ErrNoOutputs
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}
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if hf4Active && uint64(len(tx.Vout)) < config.TxMinAllowedOutputs {
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return coreerr.E("checkOutputs", fmt.Sprintf("%d (min %d)", len(tx.Vout), config.TxMinAllowedOutputs), ErrTooFewOutputs)
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}
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if uint64(len(tx.Vout)) > config.TxMaxAllowedOutputs {
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return coreerr.E("checkOutputs", fmt.Sprintf("%d", len(tx.Vout)), ErrTooManyOutputs)
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}
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for i, vout := range tx.Vout {
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switch o := vout.(type) {
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case types.TxOutputBare:
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if o.Amount == 0 {
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return coreerr.E("checkOutputs", fmt.Sprintf("output %d has zero amount", i), ErrInvalidOutput)
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}
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// Only known transparent output targets are accepted.
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switch o.Target.(type) {
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case types.TxOutToKey:
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case types.TxOutHTLC, types.TxOutMultisig:
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if !hf1Active {
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return coreerr.E("checkOutputs", fmt.Sprintf("output %d: HTLC/multisig target pre-HF1", i), ErrInvalidOutput)
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}
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case nil:
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return coreerr.E("checkOutputs", fmt.Sprintf("output %d: missing target", i), ErrInvalidOutput)
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default:
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return coreerr.E("checkOutputs", fmt.Sprintf("output %d: unsupported target %T", i, o.Target), ErrInvalidOutput)
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}
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case types.TxOutputZarcanum:
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// Validated by proof verification.
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default:
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return coreerr.E("checkOutputs", fmt.Sprintf("output %d: unsupported output type %T", i, vout), ErrInvalidOutput)
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}
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}
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return nil
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}
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func checkKeyImages(tx *types.Transaction) error {
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seen := make(map[types.KeyImage]struct{})
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for _, vin := range tx.Vin {
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var ki types.KeyImage
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switch v := vin.(type) {
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case types.TxInputToKey:
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ki = v.KeyImage
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case types.TxInputHTLC:
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ki = v.KeyImage
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default:
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continue
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}
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if _, exists := seen[ki]; exists {
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return coreerr.E("checkKeyImages", ki.String(), ErrDuplicateKeyImage)
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}
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seen[ki] = struct{}{}
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}
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return nil
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}
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func checkAssetOperations(extra []byte, hf5Active bool) error {
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if len(extra) == 0 {
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return nil
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}
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elements, err := wire.DecodeVariantVector(extra)
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if err != nil {
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return coreerr.E("checkAssetOperations", "parse extra", ErrInvalidExtra)
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}
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for i, elem := range elements {
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if elem.Tag != types.AssetDescriptorOperationTag {
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continue
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}
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if !hf5Active {
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return coreerr.E("checkAssetOperations", fmt.Sprintf("extra[%d]: asset descriptor operation pre-HF5", i), ErrInvalidExtra)
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}
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op, err := wire.DecodeAssetDescriptorOperation(elem.Data)
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if err != nil {
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return coreerr.E("checkAssetOperations", fmt.Sprintf("extra[%d]: decode asset descriptor operation", i), ErrInvalidExtra)
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}
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if err := op.Validate(); err != nil {
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return coreerr.E("checkAssetOperations", fmt.Sprintf("extra[%d]", i), err)
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}
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}
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return nil
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}
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