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<?php |
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namespace BitWasp\Bitcoin\Transaction\Bip69; |
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use BitWasp\Bitcoin\Script\ScriptWitnessInterface; |
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use BitWasp\Bitcoin\Transaction\Mutator\TxMutator; |
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use BitWasp\Bitcoin\Transaction\TransactionInputInterface; |
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use BitWasp\Bitcoin\Transaction\TransactionInterface; |
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use BitWasp\Bitcoin\Transaction\TransactionOutputInterface; |
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class Bip69 |
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{ |
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/** |
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* @param TransactionInputInterface[] $vTxin |
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* @return array |
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*/ |
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public function sortInputs(array $vTxin) |
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{ |
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usort($vTxin, [$this, 'compareInputs']); |
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return $vTxin; |
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} |
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/** |
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* @param TransactionInputInterface $vin1 |
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* @param TransactionInputInterface $vin2 |
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* @return bool |
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*/ |
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public function compareInputs(TransactionInputInterface $vin1, TransactionInputInterface $vin2) |
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{ |
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$outpoint1 = $vin1->getOutPoint(); |
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$outpoint2 = $vin2->getOutPoint(); |
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$cmpTxId = strcmp($outpoint1->getTxId()->getBinary(), $outpoint2->getTxId()->getBinary()); |
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return ($cmpTxId !== 0) ? $cmpTxId : $outpoint1->getVout() - $outpoint2->getVout(); |
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} |
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/** |
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* @param TransactionOutputInterface[] $vTxout |
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* @return TransactionOutputInterface[] |
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*/ |
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public function sortOutputs($vTxout) |
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{ |
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usort($vTxout, [$this, 'compareOutputs']); |
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return $vTxout; |
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} |
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/** |
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* @param TransactionOutputInterface $vout1 |
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* @param TransactionOutputInterface $vout2 |
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* @return bool |
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*/ |
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public function compareOutputs(TransactionOutputInterface $vout1, TransactionOutputInterface $vout2) |
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{ |
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$value = $vout1->getValue() - $vout2->getValue(); |
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return ($value !== 0) ? $value : strcmp($vout1->getScript()->getBinary(), $vout2->getScript()->getBinary()); |
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} |
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/** |
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* @param TransactionInterface $tx |
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* @return bool |
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*/ |
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public function check(TransactionInterface $tx) |
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{ |
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$inputs = $tx->getInputs(); |
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$outputs = $tx->getOutputs(); |
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return $this->sortInputs($inputs) === $inputs && $this->sortOutputs($outputs) === $outputs; |
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} |
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/** |
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* @param TransactionInputInterface[] $inputs |
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* @param ScriptWitnessInterface[] $witnesses |
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* @return array |
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* @throws \Exception |
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*/ |
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public function sortInputsAndWitness(array $inputs, array $witnesses) |
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{ |
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if (count($inputs) !== count($witnesses)) { |
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throw new \Exception('Number of inputs must match witnesses'); |
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} |
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uasort($inputs, [$this, 'compareInputs']); |
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$vWitness = []; |
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foreach ($inputs as $key => $input) { |
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$vWitness[] = $witnesses[$key]; |
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} |
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return [$inputs, $vWitness]; |
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} |
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/** |
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* @param TransactionInterface $tx |
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* @return TransactionInterface |
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*/ |
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public function mutate(TransactionInterface $tx) |
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{ |
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if (count($tx->getWitnesses()) > 0) { |
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list ($vTxin, $vWit) = $this->sortInputsAndWitness($tx->getInputs(), $tx->getWitnesses()); |
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} else { |
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$vTxin = $this->sortInputs($tx->getInputs()); |
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$vWit = []; |
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} |
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return (new TxMutator($tx)) |
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->inputs($vTxin) |
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->outputs($this->sortOutputs($tx->getOutputs())) |
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->witness($vWit) |
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->done(); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
