bitcoin-php/src/Script/Factory/ScriptCreator.php at main · ProtonMail/bitcoin-php · GitHub

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<?php

declare(strict_types=1);

namespace BitWasp\Bitcoin\Script\Factory;

use BitWasp\Bitcoin\Math\Math;

use BitWasp\Bitcoin\Script\Interpreter\Number;

use BitWasp\Bitcoin\Script\Opcodes;

use BitWasp\Bitcoin\Script\Script;

use BitWasp\Bitcoin\Script\ScriptInterface;

use BitWasp\Buffertools\Buffer;

use BitWasp\Buffertools\BufferInterface;

class ScriptCreator

{

/**

* @var string

private $script = '';

/**

* @var Opcodes

private $opcodes;

/**

* @var Math

private $math;

/**

* @param Math $math

* @param Opcodes $opcodes

* @param BufferInterface|null $buffer

public function __construct(Math $math, Opcodes $opcodes, ?BufferInterface $buffer = null)

{

if ($buffer !== null) {

$this->script = $buffer->getBinary();

}

$this->math = $math;

$this->opcodes = $opcodes;

}

/**

* Add a data-push instruction to the script,

* pushing x bytes of $data from $data, with

* the appropriate marker for the different

* PUSHDATA opcodes.

* @param BufferInterface $data

* @return $this

public function push(BufferInterface $data)

{

$length = $data->getSize();

if ($length < Opcodes::OP_PUSHDATA1) {

$this->script .= pack('C', $length) . $data->getBinary();

} else {

if ($length <= 0xff) {

$lengthSize = 1;

$code = 'C';

} elseif ($length <= 0xffff) {

$lengthSize = 2;

$code = 'S';

} else {

$lengthSize = 4;

$code = 'V';

}

$opCode = constant("BitWasp\\Bitcoin\\Script\\Opcodes::OP_PUSHDATA" . $lengthSize);

$this->script .= pack('C', $opCode) . pack($code, $length) . $data->getBinary();

}

return $this;

}

/**

* Concatenate $script onto $this.

* @param ScriptInterface $script

* @return $this

public function concat(ScriptInterface $script)

{

$this->script .= $script->getBinary();

return $this;

}

/**

* This function accepts an array of elements, builds

* an intermediate script composed of the items in $sequence,

* and concatenates it in one step.

* The allowed types are:

* - opcode (integer form)

* - script number (Number class)

* - data (BufferInterface)

* - script (ScriptInterface)

* @param int[]|\BitWasp\Bitcoin\Script\Interpreter\Number[]|BufferInterface[] $sequence

* @return $this

public function sequence(array $sequence)

{

$new = new self($this->math, $this->opcodes, null);

foreach ($sequence as $operation) {

if (is_int($operation)) {

if (!$this->opcodes->offsetExists($operation)) {

throw new \RuntimeException('Unknown opcode');

}

$new->script .= chr($operation);

} elseif ($operation instanceof Number) {

$new->push($operation->getBuffer());

} elseif ($operation instanceof BufferInterface) {

$new->push($operation);

} elseif ($operation instanceof ScriptInterface) {

$new->concat($operation);

} else {

throw new \RuntimeException('Value must be an opcode/BufferInterface/Number');

}

$this->concat($new->getScript());

return $this;

}

/**

* This function accepts an integer, and adds the appropriate

* data-push instruction to the script, minimally encoding it

* where possible.

* @param int $n

* @return $this

public function int(int $n)

{

if ($n === 0) {

$this->script .= chr(Opcodes::OP_0);

} else if ($n === -1 || ($n >= 1 && $n <= 16)) {

$this->script .= chr(\BitWasp\Bitcoin\Script\encodeOpN($n));

} else {

$this->push(Number::int($n)->getBuffer());

}

return $this;

}

/**

* Takes a list of opcodes (the name as a string)

* and adds the opcodes to the script.

* @param string... $opNames

* @return $this

public function op(string ...$opNames)

{

$opCodes = [];

foreach ($opNames as $opName) {

$opCodes[] = $this->opcodes->getOpByName($opName);

}

return $this->sequence($opCodes);

}

/**

* Takes a list of opcodes (in integer form) and

* adds them to the script.

* @param int ...$opcodes

* @return $this

public function opcode(int ...$opcodes)

{

$this->sequence($opcodes);

return $this;

}

/**

* Takes a list of data elements and adds the

* push-data instructions to the script.

* @param BufferInterface ...$dataList

* @return $this

public function data(BufferInterface ...$dataList)

{

$this->sequence($dataList);

return $this;

}

/**

* Generates a script based on the current state.

* @return ScriptInterface

public function getScript(): ScriptInterface

{

return new Script(new Buffer($this->script), $this->opcodes);

}

bitcoin-php/src/Script/Factory/ScriptCreator.php at main · ProtonMail/bitcoin-php · GitHub

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