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<?php |
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namespace BitWasp\Bitcoin\Script\Classifier; |
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use BitWasp\Bitcoin\Script\Parser\Operation; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Key\PublicKey; |
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use BitWasp\Bitcoin\Script\Opcodes; |
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use BitWasp\Bitcoin\Script\ScriptInterface; |
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class OutputClassifier implements ScriptClassifierInterface |
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{ |
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/** |
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* @var \BitWasp\Bitcoin\Script\Parser\Operation[] |
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*/ |
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private $decoded; |
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/** |
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* @var ScriptInterface |
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*/ |
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private $script; |
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/** |
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* @param ScriptInterface $script |
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*/ |
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public function __construct(ScriptInterface $script) |
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{ |
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$this->script = $script; |
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$this->decoded = $script->getScriptParser()->decode(); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isPayToPublicKey() |
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{ |
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if (count($this->decoded) < 1 || !$this->decoded[0]->isPush()) { |
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return false; |
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} |
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$size = $this->decoded[0]->getDataSize(); |
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if ($size === 33 || $size === 65) { |
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$op = $this->decoded[1]; |
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if (!$op->isPush() && $op->getOp() === Opcodes::OP_CHECKSIG) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isPayToPublicKeyHash() |
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{ |
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if (count($this->decoded) !== 5) { |
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return false; |
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} |
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$dup = $this->decoded[0]; |
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$hash = $this->decoded[1]; |
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$buf = $this->decoded[2]; |
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$eq = $this->decoded[3]; |
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$checksig = $this->decoded[4]; |
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foreach ([$dup, $hash, $eq, $checksig] as $op) { |
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/** @var Operation $op */ |
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if ($op->isPush()) { |
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return false; |
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} |
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} |
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return $dup->getOp() === Opcodes::OP_DUP |
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&& $hash->getOp() === Opcodes::OP_HASH160 |
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&& $buf->isPush() && $buf->getDataSize() === 20 |
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&& $eq->getOp() === Opcodes::OP_EQUALVERIFY |
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&& $checksig->getOp() === Opcodes::OP_CHECKSIG; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isPayToScriptHash() |
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{ |
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if (count($this->decoded) !== 3) { |
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return false; |
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} |
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$hash = $this->decoded[0]; |
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if ($hash->isPush() || !$hash->getOp() === Opcodes::OP_HASH160) { |
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return false; |
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} |
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$buffer = $this->decoded[1]; |
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if (!$buffer->isPush() || $buffer->getDataSize() !== 20) { |
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return false; |
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} |
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$eq = $this->decoded[2]; |
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return !$eq->isPush() && $eq->getOp() === Opcodes::OP_EQUAL; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isMultisig() |
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{ |
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$count = count($this->decoded); |
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if ($count <= 3) { |
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return false; |
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} |
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$mOp = $this->decoded[0]; |
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$nOp = $this->decoded[$count - 2]; |
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$checksig = $this->decoded[$count - 1]; |
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if ($mOp->isPush() || $nOp->isPush() || $checksig->isPush()) { |
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return false; |
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} |
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/** @var Operation[] $vKeys */ |
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$vKeys = array_slice($this->decoded, 1, -2); |
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foreach ($vKeys as $key) { |
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if (!$key->isPush() || !PublicKey::isCompressedOrUncompressed($key->getData())) { |
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return false; |
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} |
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} |
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return $mOp->getOp() >= Opcodes::OP_0 |
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&& $nOp->getOp() <= Opcodes::OP_16 |
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&& $checksig->getOp() === Opcodes::OP_CHECKMULTISIG; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isWitness() |
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{ |
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$buffer = $this->script->getBuffer(); |
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$size = $buffer->getSize(); |
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if ($size < 4 || $size > 34) { |
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return false; |
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} |
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$parser = $this->script->getScriptParser(); |
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$script = $parser->decode(); |
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if (count($script) !== 2 || !$script[1]->isPush()) { |
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return false; |
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} |
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$version = $script[0]->getOp(); |
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if ($version != Opcodes::OP_0 && ($version < Opcodes::OP_1 || $version > Opcodes::OP_16)) { |
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return false; |
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} |
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$witness = $script[1]; |
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if ($size === $witness->getDataSize() + 2) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @return string |
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*/ |
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public function classify() |
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{ |
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if ($this->isPayToScriptHash()) { |
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return self::PAYTOSCRIPTHASH; |
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} elseif ($this->isWitness()) { |
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return self::WITNESS; |
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} elseif ($this->isPayToPublicKey()) { |
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return self::PAYTOPUBKEY; |
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} elseif ($this->isPayToPublicKeyHash()) { |
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return self::PAYTOPUBKEYHASH; |
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} elseif ($this->isMultisig()) { |
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return self::MULTISIG; |
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} |
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return self::UNKNOWN; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
