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<?php |
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namespace BitWasp\Bitcoin\Script; |
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use BitWasp\Buffertools\BufferInterface; |
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class WitnessProgram |
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{ |
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const V0 = 0; |
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/** |
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* @var int |
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*/ |
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private $version; |
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/** |
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* @var BufferInterface |
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*/ |
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private $program; |
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/** |
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* @var |
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*/ |
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private $outputScript; |
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/** |
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* WitnessProgram constructor. |
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* @param int $version |
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* @param BufferInterface $program |
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*/ |
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public function __construct($version, BufferInterface $program) |
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{ |
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if ($this->version < 0 || $this->version > 16) { |
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throw new \RuntimeException("Invalid witness program version"); |
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} |
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if ($this->version === 0 && ($program->getSize() !== 20 && $program->getSize() !== 32)) { |
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throw new \RuntimeException('Invalid size for V0 witness program - must be 20 or 32 bytes'); |
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} |
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$this->version = $version; |
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$this->program = $program; |
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} |
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/** |
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* @param BufferInterface $program |
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* @return WitnessProgram |
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*/ |
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public static function v0(BufferInterface $program) |
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{ |
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if ($program->getSize() === 20) { |
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return new self(self::V0, $program); |
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} else if ($program->getSize() === 32) { |
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return new self(self::V0, $program); |
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} else { |
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throw new \RuntimeException('Invalid size for V0 witness program - must be 20 or 32 bytes'); |
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} |
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} |
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/** |
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* @return int |
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*/ |
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public function getVersion() |
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{ |
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return $this->version; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getProgram() |
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{ |
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return $this->program; |
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} |
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/** |
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* @return ScriptInterface |
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*/ |
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public function getScript() |
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{ |
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if (null === $this->outputScript) { |
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$this->outputScript = ScriptFactory::sequence([encodeOpN($this->version), $this->program]); |
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} |
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return $this->outputScript; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
