Script::isP2SH() - Code Metrics - Inspection of "ScriptInterface: add isP2SH function" - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#541)

by thomas

created 2017-09-30 15:11 UTC

Script::isP2SH() B

↳ Parent: Script

Complexity

Conditions	5
Paths	2

Size

Total Lines	13
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	5.2

Importance

Changes

Metric	Value
cc	5
eloc	8
nc	2
nop	1
dl	0
loc	13
ccs	4
cts	5
cp	0.8
crap	5.2
rs	8.8571
c	0
b	0
f	0

<?php

namespace BitWasp\Bitcoin\Script;

use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Crypto\Hash;
use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
use BitWasp\Bitcoin\Script\Interpreter\InterpreterInterface;
use BitWasp\Bitcoin\Script\Parser\Parser;
use BitWasp\Bitcoin\Serializable;
use BitWasp\Buffertools\Buffer;
use BitWasp\Buffertools\BufferInterface;

class Script extends Serializable implements ScriptInterface
{

    /**
     * @var Opcodes
     */
    protected $opCodes;

    /**
     * @var string
     */
    protected $script;

    /**
     * @var BufferInterface|null
     */
    protected $scriptHash;

    /**
     * @var BufferInterface|null
     */
    protected $witnessScriptHash;

    /**
     * @param BufferInterface $script
     * @param Opcodes|null $opCodes
     */
    public function __construct(BufferInterface $script = null, Opcodes $opCodes = null)
    {
        $this->script = $script instanceof BufferInterface ? $script->getBinary() : '';
        $this->opCodes = $opCodes ?: new Opcodes();
    }

    /**
     * @return BufferInterface
     */
    public function getBuffer()
    {
        return new Buffer($this->script);
    }

    /**
     * @return Parser
     */
    public function getScriptParser()
    {
        return new Parser(Bitcoin::getMath(), $this);
    }

    /**
     * Get all opcodes
     *
     * @return Opcodes
     */
    public function getOpCodes()
    {
        return $this->opCodes;
    }

    /**
     * Return a buffer containing the HASH160 of this script.
     *
     * @return BufferInterface
     */
    public function getScriptHash()
    {
        if (null === $this->scriptHash) {
            $this->scriptHash = Hash::sha256ripe160($this->getBuffer());
        }

        return $this->scriptHash;
    }

    /**
     * Return a buffer containing the SHA256 of this script.
     *
     * @return BufferInterface
     */
    public function getWitnessScriptHash()
    {
        if (null === $this->witnessScriptHash) {
            $this->witnessScriptHash = Hash::sha256($this->getBuffer());
        }

        return $this->witnessScriptHash;
    }

    /**
     * @param bool|true $accurate
     * @return int
     */
    public function countSigOps($accurate = true)
    {
        $count = 0;
        $parser = $this->getScriptParser();

        $lastOp = 0xff;
        try {
            foreach ($parser as $exec) {
                $op = $exec->getOp();

                // None of these are pushdatas, so just an opcode
                if ($op === Opcodes::OP_CHECKSIG || $op === Opcodes::OP_CHECKSIGVERIFY) {
                    $count++;
                } elseif ($op === Opcodes::OP_CHECKMULTISIG || $op === Opcodes::OP_CHECKMULTISIGVERIFY) {
                    if ($accurate && ($lastOp >= Opcodes::OP_1 && $lastOp <= Opcodes::OP_16)) {
                        $count += decodeOpN($lastOp);
                    } else {
                        $count += 20;
                    }
                }

                $lastOp = $op;
            }
        } catch (\Exception $e) {
            /* Script parsing failures don't count, and terminate the loop */
        }

        return $count;
    }

    /**
     * @param WitnessProgram $program
     * @param ScriptWitnessInterface $scriptWitness
     * @return int
     */
    private function witnessSigOps(WitnessProgram $program, ScriptWitnessInterface $scriptWitness)
    {
        if ($program->getVersion() === 0) {
            $size = $program->getProgram()->getSize();
            if ($size === 32 && count($scriptWitness) > 0) {
                $script = new Script($scriptWitness->bottom());
                return $script->countSigOps(true);
            }

            if ($size === 20) {
                return 1;
            }
        }

        return 0;
    }

    /**
     * @param ScriptInterface $scriptSig
     * @param ScriptWitnessInterface $scriptWitness
     * @param int $flags
     * @return int
     */
    public function countWitnessSigOps(ScriptInterface $scriptSig, ScriptWitnessInterface $scriptWitness, $flags)
    {
        if ($flags & InterpreterInterface::VERIFY_WITNESS === 0) {
            return 0;
        }

        $program = null;
        if ($this->isWitness($program)) {
            /** @var WitnessProgram $program */
            return $this->witnessSigOps($program, $scriptWitness);
        }

        if ((new OutputClassifier())->isPayToScriptHash($this)) {
            $parsed = $scriptSig->getScriptParser()->decode();
            $subscript = new Script(end($parsed)->getData());
            if ($subscript->isWitness($program)) {
                /** @var WitnessProgram $program */
                return $this->witnessSigOps($program, $scriptWitness);
            }
        }

        return 0;
    }

    /**
     * @param ScriptInterface $scriptSig
     * @return int
     */
    public function countP2shSigOps(ScriptInterface $scriptSig)
    {
        if (!(new OutputClassifier())->isPayToScriptHash($this)) {
            return $this->countSigOps(true);
        }

        try {
            $data = null;
            foreach ($scriptSig->getScriptParser() as $exec) {
                if ($exec->getOp() > Opcodes::OP_16) {
                    return 0;
                }

                if ($exec->isPush()) {
                    $data = $exec->getData();
                }
            }

            if (!$data instanceof BufferInterface) {
                return 0;
            }

            return (new Script($data))->countSigOps(true);
        } catch (\Exception $e) {
            return 0;
        }
    }

    /**
     * @return bool
     */
    public function isPushOnly()
    {
        foreach ($this->getScriptParser()->decode() as $entity) {
            if ($entity->getOp() > Opcodes::OP_16) {
                return false;
            }
        }

        return true;
    }

    /**
     * @param WitnessProgram|null $program
     * @return bool
     */
    public function isWitness(& $program = null)
    {
        $buffer = $this->getBuffer();
        $size = $buffer->getSize();
        if ($size < 4 || $size > 42) {
            return false;
        }

        $script = $this->getScriptParser()->decode();
        if (!isset($script[0]) || !isset($script[1])) {
            return false;
        }

        $version = $script[0]->getOp();
        if ($version !== Opcodes::OP_0 && ($version < Opcodes::OP_1 || $version > Opcodes::OP_16)) {
            return false;
        }

        $witness = $script[1];
        if ($script[1]->isPush() && $size === $witness->getDataSize() + 2) {
            $program = new WitnessProgram(decodeOpN($version), $witness->getData());
            return true;
        }

        return false;
    }

    /**
     * @param BufferInterface $scriptHash
     * @return bool
     */
    public function isP2SH(& $scriptHash)
    {
        if (strlen($this->script) === 23
            && $this->script[0] = Opcodes::OP_HASH160

            && $this->script[1] = 20

            && $this->script[22] = Opcodes::OP_EQUAL
        ) {
            $scriptHash = new Buffer(substr($this->script, 2, 20));
            return true;
        }

        return false;
    }

    /**
     * @param ScriptInterface $script
     * @return bool
     */
    public function equals(ScriptInterface $script)
    {
        return strcmp($this->script, $script->getBinary()) === 0;
    }

    /**
     * @return string
     */
    public function __debugInfo()
    {
        try {
            $decoded = $this->getScriptParser()->getHumanReadable();
        } catch (\Exception $e) {
            $decoded = 'decode failed';
        }
        return [
            'hex' => bin2hex($this->script),
            'asm' => $decoded
        ];
    }
}


1		<?php
2
3		namespace BitWasp\Bitcoin\Script;
4
5		use BitWasp\Bitcoin\Bitcoin;
6		use BitWasp\Bitcoin\Crypto\Hash;
7		use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
8		use BitWasp\Bitcoin\Script\Interpreter\InterpreterInterface;
9		use BitWasp\Bitcoin\Script\Parser\Parser;
10		use BitWasp\Bitcoin\Serializable;
11		use BitWasp\Buffertools\Buffer;
12		use BitWasp\Buffertools\BufferInterface;
13
14		class Script extends Serializable implements ScriptInterface
15		{
16
17		/**
18		* @var Opcodes
19		*/
20		protected $opCodes;
21
22		/**
23		* @var string
24		*/
25		protected $script;
26
27		/**
28		* @var BufferInterface\|null
29		*/
30		protected $scriptHash;
31
32		/**
33		* @var BufferInterface\|null
34		*/
35		protected $witnessScriptHash;
36
37		/**
38		* @param BufferInterface $script
39		* @param Opcodes\|null $opCodes
40		*/
41	3006	public function __construct(BufferInterface $script = null, Opcodes $opCodes = null)
42		{
43	3006	$this->script = $script instanceof BufferInterface ? $script->getBinary() : '';
44	3006	$this->opCodes = $opCodes ?: new Opcodes();
45	3006	}
46
47		/**
48		* @return BufferInterface
49		*/
50	3044	public function getBuffer()
51		{
52	3044	return new Buffer($this->script);
53		}
54
55		/**
56		* @return Parser
57		*/
58	2812	public function getScriptParser()
59		{
60	2812	return new Parser(Bitcoin::getMath(), $this);
61		}
62
63		/**
64		* Get all opcodes
65		*
66		* @return Opcodes
67		*/
68	10	public function getOpCodes()
69		{
70	10	return $this->opCodes;
71		}
72
73		/**
74		* Return a buffer containing the HASH160 of this script.
75		*
76		* @return BufferInterface
77		*/
78	86	public function getScriptHash()
79		{
80	86	if (null === $this->scriptHash) {
81	82	$this->scriptHash = Hash::sha256ripe160($this->getBuffer());
82		}
83
84	86	return $this->scriptHash;
85		}
86
87		/**
88		* Return a buffer containing the SHA256 of this script.
89		*
90		* @return BufferInterface
91		*/
92	180	public function getWitnessScriptHash()
93		{
94	180	if (null === $this->witnessScriptHash) {
95	180	$this->witnessScriptHash = Hash::sha256($this->getBuffer());
96		}
97
98	180	return $this->witnessScriptHash;
99		}
100
101		/**
102		* @param bool\|true $accurate
103		* @return int
104		*/
105	18	public function countSigOps($accurate = true)
106		{
107	18	$count = 0;
108	18	$parser = $this->getScriptParser();
109
110	18	$lastOp = 0xff;
111		try {
112	18	foreach ($parser as $exec) {
113	12	$op = $exec->getOp();
114
115		// None of these are pushdatas, so just an opcode
116	12	if ($op === Opcodes::OP_CHECKSIG \|\| $op === Opcodes::OP_CHECKSIGVERIFY) {
117	6	$count++;
118	12	} elseif ($op === Opcodes::OP_CHECKMULTISIG \|\| $op === Opcodes::OP_CHECKMULTISIGVERIFY) {
119	10	if ($accurate && ($lastOp >= Opcodes::OP_1 && $lastOp <= Opcodes::OP_16)) {
120	8	$count += decodeOpN($lastOp);
121		} else {
122	4	$count += 20;
123		}
124		}
125
126	16	$lastOp = $op;
127		}
128	2	} catch (\Exception $e) {
129		/* Script parsing failures don't count, and terminate the loop */
130		}
131
132	18	return $count;
133		}
134
135		/**
136		* @param WitnessProgram $program
137		* @param ScriptWitnessInterface $scriptWitness
138		* @return int
139		*/
140	2	private function witnessSigOps(WitnessProgram $program, ScriptWitnessInterface $scriptWitness)
141		{
142	2	if ($program->getVersion() === 0) {
143	2	$size = $program->getProgram()->getSize();
144	2	if ($size === 32 && count($scriptWitness) > 0) {
145	2	$script = new Script($scriptWitness->bottom());
146	2	return $script->countSigOps(true);
147		}
148
149		if ($size === 20) {
150		return 1;
151		}
152		}
153
154		return 0;
155		}
156
157		/**
158		* @param ScriptInterface $scriptSig
159		* @param ScriptWitnessInterface $scriptWitness
160		* @param int $flags
161		* @return int
162		*/
163	2	public function countWitnessSigOps(ScriptInterface $scriptSig, ScriptWitnessInterface $scriptWitness, $flags)
164		{
165	2	if ($flags & InterpreterInterface::VERIFY_WITNESS === 0) {
166		return 0;
167		}
168
169	2	$program = null;
170	2	if ($this->isWitness($program)) {
171		/** @var WitnessProgram $program */
172	2	return $this->witnessSigOps($program, $scriptWitness);
173		}
174
175		if ((new OutputClassifier())->isPayToScriptHash($this)) {
176		$parsed = $scriptSig->getScriptParser()->decode();
177		$subscript = new Script(end($parsed)->getData());
178		if ($subscript->isWitness($program)) {
179		/** @var WitnessProgram $program */
180		return $this->witnessSigOps($program, $scriptWitness);
181		}
182		}
183
184		return 0;
185		}
186
187		/**
188		* @param ScriptInterface $scriptSig
189		* @return int
190		*/
191	8	public function countP2shSigOps(ScriptInterface $scriptSig)
192		{
193	8	if (!(new OutputClassifier())->isPayToScriptHash($this)) {
194	4	return $this->countSigOps(true);
195		}
196
197		try {
198	8	$data = null;
199	8	foreach ($scriptSig->getScriptParser() as $exec) {
200	8	if ($exec->getOp() > Opcodes::OP_16) {
201	2	return 0;
202		}
203
204	6	if ($exec->isPush()) {
205	6	$data = $exec->getData();
206		}
207		}
208
209	8	if (!$data instanceof BufferInterface) {
210	2	return 0;
211		}
212
213	6	return (new Script($data))->countSigOps(true);
214		} catch (\Exception $e) {
215		return 0;
216		}
217		}
218
219		/**
220		* @return bool
221		*/
222	214	public function isPushOnly()
223		{
224	214	foreach ($this->getScriptParser()->decode() as $entity) {
225	214	if ($entity->getOp() > Opcodes::OP_16) {
226	214	return false;
227		}
228		}
229
230	200	return true;
231		}
232
233		/**
234		* @param WitnessProgram\|null $program
235		* @return bool
236		*/
237	332	public function isWitness(& $program = null)
238		{
239	332	$buffer = $this->getBuffer();
240	332	$size = $buffer->getSize();
241	332	if ($size < 4 \|\| $size > 42) {
242	62	return false;
243		}
244
245	280	$script = $this->getScriptParser()->decode();
246	280	if (!isset($script[0]) \|\| !isset($script[1])) {
247	2	return false;
248		}
249
250	278	$version = $script[0]->getOp();
251	278	if ($version !== Opcodes::OP_0 && ($version < Opcodes::OP_1 \|\| $version > Opcodes::OP_16)) {
252	168	return false;
253		}
254
255	198	$witness = $script[1];
256	198	if ($script[1]->isPush() && $size === $witness->getDataSize() + 2) {
257	192	$program = new WitnessProgram(decodeOpN($version), $witness->getData());
258	192	return true;
259		}
260
261	6	return false;
262		}
263
264		/**
265		* @param BufferInterface $scriptHash
266		* @return bool
267		*/
268	272	public function isP2SH(& $scriptHash)
269		{
270	272	if (strlen($this->script) === 23
271		&& $this->script[0] = Opcodes::OP_HASH160
		0 ignored issues – show Comprehensibility introduced 2017-09-30 16:28 UTC by Report Bug Copy Issue Report Consider adding parentheses for clarity. Current Interpretation: `$this->script[0] = (\Bit...pt\Opcodes::OP_EQUAL)))`, Probably Intended Meaning: `($this->script[0] = \Bit...ript\Opcodes::OP_EQUAL)` Loading history...
272		&& $this->script[1] = 20
		0 ignored issues – show Comprehensibility introduced 2017-09-30 16:28 UTC by Report Bug Copy Issue Report Consider adding parentheses for clarity. Current Interpretation: `$this->script[1] = (20 &...ipt\Opcodes::OP_EQUAL))`, Probably Intended Meaning: `($this->script[1] = 20) ...cript\Opcodes::OP_EQUAL` Loading history...
273		&& $this->script[22] = Opcodes::OP_EQUAL
274		) {
275		$scriptHash = new Buffer(substr($this->script, 2, 20));
276	2	return true;
277		}
278
279	2	return false;
280		}
281
282		/**
283		* @param ScriptInterface $script
284	2	* @return bool
285	2	*/
286		public function equals(ScriptInterface $script)
287		{
288		return strcmp($this->script, $script->getBinary()) === 0;
289		}
290
291		/**
292		* @return string
293		*/
294		public function __debugInfo()
295		{
296		try {
297		$decoded = $this->getScriptParser()->getHumanReadable();
298		} catch (\Exception $e) {
299		$decoded = 'decode failed';
300		}
301		return [
302		'hex' => bin2hex($this->script),
303		'asm' => $decoded
304		];
305		}
306		}
307

Bit-Wasp / bitcoin-php

Pull Request — master (#541)

Script::isP2SH() B

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Size

Duplication

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