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<?php |
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namespace BitWasp\Bitcoin\PaymentProtocol; |
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use BitWasp\Bitcoin\Math\Math; |
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use BitWasp\Bitcoin\PaymentProtocol\Protobufs\Payment; |
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use BitWasp\Bitcoin\PaymentProtocol\Protobufs\PaymentDetails; |
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use BitWasp\Bitcoin\PaymentProtocol\Protobufs\PaymentRequest; |
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use BitWasp\Bitcoin\Transaction\TransactionFactory; |
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use BitWasp\Bitcoin\Transaction\TransactionInterface; |
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use BitWasp\Buffertools\Buffer; |
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class PaymentVerifier |
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{ |
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/** |
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* @var Math |
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*/ |
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private $math; |
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/** |
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* PaymentVerifier constructor. |
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* @param Math $math |
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*/ |
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public function __construct(Math $math) |
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{ |
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$this->math = $math; |
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} |
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/** |
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* @param Payment $payment |
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* @return TransactionInterface[] |
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*/ |
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public function getTransactions(Payment $payment) |
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{ |
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return array_map( |
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function ($binTx) { |
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return TransactionFactory::fromHex(new Buffer($binTx)); |
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}, |
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$payment->getTransactionsList() |
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); |
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} |
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/** |
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* @param PaymentRequest $request |
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* @param TransactionInterface[] $collection |
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* @return bool |
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*/ |
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public function checkTransactions(PaymentRequest $request, array $collection) |
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{ |
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// Add up cumulative amounts for each destination |
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$scriptAmount = []; |
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array_map(function (TransactionInterface $tx) use (&$scriptAmount) { |
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foreach ($tx->getOutputs() as $output) { |
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$scriptBin = $output->getScript()->getBinary(); |
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if (array_key_exists($scriptBin, $scriptAmount)) { |
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$scriptAmount[$scriptBin] = $this->math->add(gmp_init($output->getValue(), 10), $scriptAmount[$scriptBin]); |
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} else { |
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$scriptAmount[$scriptBin] = gmp_init($output->getValue(), 10); |
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} |
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} |
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}, $collection); |
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// Do the same for our PaymentDetails |
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$details = new PaymentDetails(); |
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$details->parse($request->getSerializedPaymentDetails()); |
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$requiredAmounts = []; |
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foreach ($details->getOutputsList() as $out) { |
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$scriptBin = $out->getScript(); |
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if (array_key_exists($scriptBin, $requiredAmounts)) { |
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$requiredAmounts[$scriptBin] = $this->math->add(gmp_init($out->getAmount(), 10), $requiredAmounts[$scriptBin]); |
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} else { |
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$requiredAmounts[$scriptBin] = gmp_init($out->getAmount(), 10); |
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} |
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} |
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// Check required amounts against user transaction |
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foreach ($requiredAmounts as $script => $value) { |
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// Script not funded |
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if (!array_key_exists($script, $scriptAmount)) { |
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return false; |
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} |
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// Script not paid enough |
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if ($this->math->cmp($scriptAmount[$script], $value) < 0) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* Verifies that outputs of transactions in Payment |
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* satisfy the amounts required by the PaymentRequest. |
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* |
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* @param Payment $payment |
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* @param PaymentRequest $request |
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* @return bool |
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*/ |
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public function checkPayment(PaymentRequest $request, Payment $payment) |
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{ |
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$transactions = $this->getTransactions($payment); |
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return $this->checkTransactions($request, $transactions); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
