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<?php |
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namespace BitWasp\Bitcoin\Transaction\Factory\ScriptInfo; |
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use BitWasp\Bitcoin\Locktime; |
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use BitWasp\Bitcoin\Script\Interpreter\Number; |
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use BitWasp\Bitcoin\Script\Opcodes; |
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use BitWasp\Bitcoin\Script\Parser\Operation; |
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use BitWasp\Bitcoin\Script\ScriptInterface; |
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use BitWasp\Bitcoin\Transaction\TransactionInput; |
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class CheckSequenceVerify |
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{ |
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/** |
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* @var int |
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*/ |
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private $relativeTimeLock; |
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/** |
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* CheckLocktimeVerify constructor. |
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* @param int $relativeTimeLock |
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*/ |
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public function __construct($relativeTimeLock) |
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{ |
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if ($relativeTimeLock < 0) { |
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throw new \RuntimeException("relative locktime cannot be negative"); |
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} |
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if ($relativeTimeLock > Locktime::INT_MAX) { |
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throw new \RuntimeException("nLockTime exceeds maximum value"); |
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} |
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$this->relativeTimeLock = $relativeTimeLock; |
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} |
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/** |
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* @param Operation[] $chunks |
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* @param bool $fMinimal |
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* @return static |
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*/ |
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public static function fromDecodedScript(array $chunks, $fMinimal = false) |
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{ |
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if (count($chunks) !== 3) { |
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throw new \RuntimeException("Invalid number of items for CSV"); |
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} |
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if (!$chunks[0]->isPush()) { |
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throw new \InvalidArgumentException('CSV script had invalid value for time'); |
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} |
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if ($chunks[1]->getOp() !== Opcodes::OP_CHECKSEQUENCEVERIFY) { |
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throw new \InvalidArgumentException('CSV script invalid opcode'); |
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} |
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if ($chunks[2]->getOp() !== Opcodes::OP_DROP) { |
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throw new \InvalidArgumentException('CSV script invalid opcode'); |
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} |
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$numLockTime = Number::buffer($chunks[0]->getData(), $fMinimal, 5); |
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return new static($numLockTime->getInt()); |
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} |
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/** |
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* @param ScriptInterface $script |
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* @return CheckSequenceVerify |
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*/ |
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public static function fromScript(ScriptInterface $script) |
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{ |
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return static::fromDecodedScript($script->getScriptParser()->decode()); |
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} |
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/** |
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* @return int |
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*/ |
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public function getRelativeLockTime() |
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{ |
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return $this->relativeTimeLock; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isRelativeToBlock() |
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{ |
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if ($this->isDisabled()) { |
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throw new \RuntimeException("This opcode seems to be disabled"); |
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} |
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return ($this->relativeTimeLock & TransactionInput::SEQUENCE_LOCKTIME_TYPE_FLAG) === 0; |
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} |
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/** |
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* @return int |
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*/ |
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public function isDisabled() |
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{ |
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return $this->relativeTimeLock & TransactionInput::SEQUENCE_LOCKTIME_DISABLE_FLAG; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
