Bit-Wasp /
bitcoin-php
Complex classes like InputSigner often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use InputSigner, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 38 | class InputSigner |
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| 39 | { |
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| 40 | /** |
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| 41 | * @var array |
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| 42 | */ |
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| 43 | protected static $canSign = [ |
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| 44 | ScriptType::P2PKH, |
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| 45 | ScriptType::P2PK, |
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| 46 | ScriptType::MULTISIG |
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| 47 | ]; |
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| 48 | |||
| 49 | /** |
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| 50 | * @var array |
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| 51 | */ |
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| 52 | protected static $validP2sh = [ |
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| 53 | ScriptType::P2WKH, |
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| 54 | ScriptType::P2WSH, |
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| 55 | ScriptType::P2PKH, |
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| 56 | ScriptType::P2PK, |
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| 57 | ScriptType::MULTISIG |
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| 58 | ]; |
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| 59 | |||
| 60 | /** |
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| 61 | * @var EcAdapterInterface |
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| 62 | */ |
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| 63 | private $ecAdapter; |
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| 64 | |||
| 65 | /** |
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| 66 | * @var OutputData $scriptPubKey |
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| 67 | */ |
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| 68 | private $scriptPubKey; |
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| 69 | |||
| 70 | /** |
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| 71 | * @var OutputData $redeemScript |
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| 72 | */ |
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| 73 | private $redeemScript; |
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| 74 | |||
| 75 | /** |
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| 76 | * @var OutputData $witnessScript |
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| 77 | */ |
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| 78 | private $witnessScript; |
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| 79 | |||
| 80 | /** |
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| 81 | * @var OutputData |
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| 82 | */ |
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| 83 | private $signScript; |
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| 84 | |||
| 85 | /** |
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| 86 | * @var int |
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| 87 | */ |
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| 88 | private $sigVersion; |
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| 89 | |||
| 90 | /** |
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| 91 | * @var OutputData $witnessKeyHash |
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| 92 | */ |
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| 93 | private $witnessKeyHash; |
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| 94 | |||
| 95 | /** |
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| 96 | * @var TransactionInterface |
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| 97 | */ |
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| 98 | private $tx; |
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| 99 | |||
| 100 | /** |
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| 101 | * @var int |
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| 102 | */ |
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| 103 | private $nInput; |
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| 104 | |||
| 105 | /** |
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| 106 | * @var TransactionOutputInterface |
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| 107 | */ |
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| 108 | private $txOut; |
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| 109 | |||
| 110 | /** |
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| 111 | * @var PublicKeyInterface[] |
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| 112 | */ |
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| 113 | private $publicKeys = []; |
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| 114 | |||
| 115 | /** |
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| 116 | * @var TransactionSignatureInterface[] |
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| 117 | */ |
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| 118 | private $signatures = []; |
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| 119 | |||
| 120 | /** |
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| 121 | * @var int |
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| 122 | */ |
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| 123 | private $requiredSigs = 0; |
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| 124 | |||
| 125 | /** |
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| 126 | * @var OutputClassifier |
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| 127 | */ |
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| 128 | private $classifier; |
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| 129 | |||
| 130 | /** |
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| 131 | * @var Interpreter |
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| 132 | */ |
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| 133 | private $interpreter; |
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| 134 | |||
| 135 | /** |
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| 136 | * @var Checker |
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| 137 | */ |
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| 138 | private $signatureChecker; |
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| 139 | |||
| 140 | /** |
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| 141 | * TxInputSigning constructor. |
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| 142 | * @param EcAdapterInterface $ecAdapter |
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| 143 | * @param TransactionInterface $tx |
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| 144 | * @param int $nInput |
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| 145 | * @param TransactionOutputInterface $txOut |
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| 146 | * @param SignData $signData |
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| 147 | */ |
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| 148 | 88 | public function __construct(EcAdapterInterface $ecAdapter, TransactionInterface $tx, $nInput, TransactionOutputInterface $txOut, SignData $signData) |
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| 149 | { |
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| 150 | 88 | $inputs = $tx->getInputs(); |
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| 151 | 88 | if (!isset($inputs[$nInput])) { |
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| 152 | 2 | throw new \RuntimeException('No input at this index'); |
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| 153 | } |
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| 154 | |||
| 155 | 86 | $this->ecAdapter = $ecAdapter; |
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| 156 | 86 | $this->tx = $tx; |
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| 157 | 86 | $this->nInput = $nInput; |
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| 158 | 86 | $this->txOut = $txOut; |
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| 159 | 86 | $this->pubKeySerializer = EcSerializer::getSerializer(PublicKeySerializerInterface::class, $ecAdapter); |
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| 160 | 86 | $this->txSigSerializer = new TransactionSignatureSerializer(EcSerializer::getSerializer(DerSignatureSerializerInterface::class, $ecAdapter)); |
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| 161 | 86 | $this->classifier = new OutputClassifier(); |
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| 162 | 86 | $this->interpreter = new Interpreter(); |
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| 163 | 86 | $this->signatureChecker = new Checker($this->ecAdapter, $this->tx, $nInput, $txOut->getValue()); |
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| 164 | 86 | $this->flags = $signData->hasSignaturePolicy() ? $signData->getSignaturePolicy() : Interpreter::VERIFY_NONE; |
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| 165 | 86 | $this->publicKeys = []; |
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| 166 | 86 | $this->signatures = []; |
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| 167 | |||
| 168 | 86 | $scriptSig = $inputs[$nInput]->getScript(); |
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| 169 | 86 | $witness = isset($tx->getWitnesses()[$nInput]) ? $tx->getWitnesses()[$nInput]->all() : []; |
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| 170 | |||
| 171 | 86 | $this->solve($signData, $txOut->getScript(), $scriptSig, $witness); |
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| 172 | 58 | } |
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| 173 | |||
| 174 | /** |
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| 175 | * @param TransactionSignatureInterface[] $stack |
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| 176 | * @param PublicKeyInterface[] $publicKeys |
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| 177 | * @return \SplObjectStorage |
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| 178 | */ |
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| 179 | 12 | private function sortMultiSigs($stack, array $publicKeys) |
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| 180 | { |
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| 181 | 12 | $sigSort = new SignatureSort($this->ecAdapter); |
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| 182 | 12 | $sigs = new \SplObjectStorage; |
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| 183 | |||
| 184 | 12 | foreach ($stack as $txSig) { |
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| 185 | 12 | $hash = $this->getSigHash($txSig->getHashType()); |
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| 186 | 12 | $linked = $sigSort->link([$txSig->getSignature()], $publicKeys, $hash); |
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| 187 | 12 | foreach ($publicKeys as $key) { |
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| 188 | 12 | if ($linked->contains($key)) { |
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| 189 | 12 | $sigs[$key] = $txSig; |
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| 190 | } |
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| 191 | } |
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| 192 | } |
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| 193 | |||
| 194 | 12 | return $sigs; |
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| 195 | } |
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| 196 | |||
| 197 | /** |
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| 198 | * @param ScriptInterface $script |
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| 199 | * @return \BitWasp\Buffertools\BufferInterface[] |
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| 200 | */ |
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| 201 | 68 | private function evalPushOnly(ScriptInterface $script) |
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| 202 | { |
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| 203 | 68 | $stack = new Stack(); |
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| 204 | 68 | $interpreter = new Interpreter(); |
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| 205 | 68 | $interpreter->evaluate($script, $stack, SigHash::V0, $this->flags | Interpreter::VERIFY_SIGPUSHONLY, $this->signatureChecker); |
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| 206 | 68 | return $stack->all(); |
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| 207 | } |
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| 208 | |||
| 209 | /** |
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| 210 | * @param BufferInterface[] $buffers |
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| 211 | * @return ScriptInterface |
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| 212 | */ |
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| 213 | private function pushAll(array $buffers) |
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| 214 | { |
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| 215 | 50 | return ScriptFactory::sequence(array_map(function ($buffer) { |
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| 216 | 42 | if (!($buffer instanceof BufferInterface)) { |
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| 217 | throw new \RuntimeException('Script contained a non-push opcode'); |
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| 218 | } |
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| 219 | |||
| 220 | 42 | $size = $buffer->getSize(); |
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| 221 | 42 | if ($size === 0) { |
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| 222 | 4 | return Opcodes::OP_0; |
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| 223 | } |
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| 224 | |||
| 225 | 42 | $first = ord($buffer->getBinary()); |
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| 226 | 42 | if ($size === 1 && $first >= 1 && $first <= 16) { |
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| 227 | return \BitWasp\Bitcoin\Script\encodeOpN($first); |
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| 228 | } else { |
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| 229 | 42 | return $buffer; |
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| 230 | } |
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| 231 | 50 | }, $buffers)); |
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| 232 | } |
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| 233 | |||
| 234 | /** |
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| 235 | * @param int $flags |
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| 236 | * @param ScriptInterface $scriptSig |
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| 237 | * @param ScriptInterface $scriptPubKey |
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| 238 | * @param ScriptWitnessInterface|null $scriptWitness |
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| 239 | * @return bool |
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| 240 | */ |
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| 241 | 26 | private function verifySolution($flags, ScriptInterface $scriptSig, ScriptInterface $scriptPubKey, ScriptWitnessInterface $scriptWitness = null) |
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| 245 | |||
| 246 | /** |
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| 247 | * @param ScriptInterface $scriptPubKey |
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| 248 | * @param array $chunks |
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| 249 | * @param int $sigVersion |
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| 250 | * @return bool |
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| 251 | */ |
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| 252 | 44 | private function evaluateSolution(ScriptInterface $scriptPubKey, array $chunks, $sigVersion) |
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| 253 | { |
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| 254 | 44 | $stack = new Stack($chunks); |
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| 255 | 44 | if (!$this->interpreter->evaluate($scriptPubKey, $stack, $sigVersion, $this->flags, $this->signatureChecker)) { |
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| 256 | 2 | return false; |
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| 257 | } |
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| 258 | |||
| 259 | 42 | if ($stack->isEmpty()) { |
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| 260 | return false; |
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| 261 | } |
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| 262 | |||
| 263 | 42 | if (false === $this->interpreter->castToBool($stack[-1])) { |
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| 264 | 2 | return false; |
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| 265 | } |
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| 266 | |||
| 267 | 40 | return true; |
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| 268 | } |
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| 269 | |||
| 270 | /** |
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| 271 | * This function is strictly for $canSign types. |
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| 272 | * It will extract signatures/publicKeys when given $outputData, and $stack. |
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| 273 | * $stack is the result of decompiling a scriptSig, or taking the witness data. |
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| 274 | * @param OutputData $outputData |
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| 275 | * @param array $stack |
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| 276 | * @param $sigVersion |
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| 277 | * @return mixed |
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| 278 | */ |
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| 279 | 64 | public function extractFromValues(OutputData $outputData, array $stack, $sigVersion) |
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| 280 | { |
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| 281 | 64 | $type = $outputData->getType(); |
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| 282 | 64 | $size = count($stack); |
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| 283 | 64 | if ($type === ScriptType::P2PKH) { |
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| 284 | 38 | $this->requiredSigs = 1; |
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| 285 | 38 | if ($size === 2) { |
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| 286 | 34 | if (!$this->evaluateSolution($outputData->getScript(), $stack, $sigVersion)) { |
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| 287 | 2 | throw new \RuntimeException('Existing signatures are invalid!'); |
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| 288 | } |
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| 289 | 32 | $this->signatures = [$this->txSigSerializer->parse($stack[0])]; |
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| 290 | 32 | $this->publicKeys = [$this->pubKeySerializer->parse($stack[1])]; |
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| 291 | } |
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| 292 | } |
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| 293 | |||
| 294 | 62 | if ($type === ScriptType::P2PK && count($stack) === 1) { |
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| 295 | 12 | $this->requiredSigs = 1; |
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| 296 | 12 | if ($size === 1) { |
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| 297 | 12 | if (!$this->evaluateSolution($outputData->getScript(), $stack, $sigVersion)) { |
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| 298 | 2 | throw new \RuntimeException('Existing signatures are invalid!'); |
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| 299 | } |
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| 300 | |||
| 301 | 10 | $this->signatures = [$this->txSigSerializer->parse($stack[0])]; |
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| 302 | 10 | $this->publicKeys = [$this->pubKeySerializer->parse($outputData->getSolution())]; |
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| 303 | } |
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| 304 | } |
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| 305 | |||
| 306 | 60 | if ($type === ScriptType::MULTISIG) { |
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| 307 | 14 | $info = new Multisig($outputData->getScript()); |
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| 308 | 14 | $this->requiredSigs = $info->getRequiredSigCount(); |
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| 309 | 14 | $this->publicKeys = $info->getKeys(); |
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| 310 | 14 | if ($size > 1) { |
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| 311 | 12 | $vars = []; |
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| 312 | 12 | for ($i = 1, $j = $size - 1; $i <= $j; $i++) { |
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| 313 | try { |
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| 314 | 12 | $vars[] = $this->txSigSerializer->parse($stack[$i]); |
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| 315 | } catch (\Exception $e) { |
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| 316 | // Try-catch block necessary because we don't know it's actually a TransactionSignature |
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| 317 | } |
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| 318 | } |
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| 319 | |||
| 320 | 12 | $this->signatures = array_fill(0, count($this->publicKeys), null); |
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| 321 | 12 | $sigs = $this->sortMultiSigs($vars, $this->publicKeys); |
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| 322 | 12 | $count = 0; |
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| 323 | 12 | foreach ($this->publicKeys as $idx => $key) { |
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| 324 | 12 | if (isset($sigs[$key])) { |
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| 325 | 10 | $this->signatures[$idx] = $sigs[$key]; |
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| 326 | 12 | $count++; |
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| 327 | } |
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| 328 | } |
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| 329 | |||
| 330 | 12 | if (count($vars) !== $count) { |
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| 331 | 2 | throw new \RuntimeException('Existing signatures are invalid!'); |
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| 332 | } |
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| 333 | // Don't evaluate, already checked sigs during sort. Todo: fix this. |
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| 334 | } |
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| 335 | } |
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| 336 | |||
| 337 | 58 | return $type; |
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| 338 | } |
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| 339 | |||
| 340 | /** |
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| 341 | * Called upon instance creation. |
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| 342 | * This function must throw an exception whenever execution |
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| 343 | * does not yield a signable script. |
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| 344 | * |
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| 345 | * It ensures: |
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| 346 | * - the scriptPubKey can be directly signed, or leads to P2SH/P2WSH/P2WKH |
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| 347 | * - the P2SH script covers signable types and P2WSH/P2WKH |
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| 348 | * - the witnessScript covers signable types only |
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| 349 | * - violating the above prevents instance creation |
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| 350 | * @param SignData $signData |
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| 351 | * @param ScriptInterface $scriptPubKey |
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| 352 | * @param ScriptInterface $scriptSig |
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| 353 | * @param BufferInterface[] $witness |
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| 354 | * @return $this |
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| 355 | * @throws \Exception |
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| 356 | */ |
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| 357 | 86 | private function solve(SignData $signData, ScriptInterface $scriptPubKey, ScriptInterface $scriptSig, array $witness) |
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| 358 | { |
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| 359 | 86 | $sigVersion = SigHash::V0; |
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| 360 | 86 | $sigChunks = []; |
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| 361 | 86 | $solution = $this->scriptPubKey = $this->classifier->decode($scriptPubKey); |
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| 362 | 86 | if ($solution->getType() !== ScriptType::P2SH && !in_array($solution->getType(), self::$validP2sh)) { |
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| 363 | 2 | throw new \RuntimeException('scriptPubKey not supported'); |
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| 364 | } |
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| 365 | |||
| 366 | 84 | if ($solution->canSign()) { |
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| 367 | 38 | $sigChunks = $this->evalPushOnly($scriptSig); |
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| 368 | } |
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| 369 | |||
| 370 | 84 | if ($solution->getType() === ScriptType::P2SH) { |
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| 371 | 30 | $chunks = $this->evalPushOnly($scriptSig); |
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| 372 | 30 | $redeemScript = null; |
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| 373 | 30 | if (count($chunks) > 0) { |
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| 374 | 22 | $redeemScript = new Script($chunks[count($chunks) - 1]); |
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| 375 | } else { |
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| 376 | 26 | if (!$signData->hasRedeemScript()) { |
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| 377 | 2 | throw new \RuntimeException('Redeem script not provided in sign data or scriptSig'); |
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| 378 | } |
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| 379 | } |
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| 380 | |||
| 381 | 28 | if ($signData->hasRedeemScript()) { |
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| 382 | 28 | if ($redeemScript === null) { |
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| 383 | 24 | $redeemScript = $signData->getRedeemScript(); |
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| 384 | } |
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| 385 | |||
| 386 | 28 | if (!$redeemScript->equals($signData->getRedeemScript())) { |
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| 387 | 2 | throw new \RuntimeException('Extracted redeemScript did not match sign data'); |
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| 388 | } |
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| 389 | } |
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| 390 | |||
| 391 | 26 | if (!$this->verifySolution(Interpreter::VERIFY_SIGPUSHONLY, ScriptFactory::sequence([$redeemScript->getBuffer()]), $solution->getScript())) { |
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| 392 | 2 | throw new \RuntimeException('Redeem script fails to solve pay-to-script-hash'); |
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| 393 | } |
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| 394 | |||
| 395 | 24 | $solution = $this->redeemScript = $this->classifier->decode($redeemScript); |
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| 396 | 24 | if (!in_array($solution->getType(), self::$validP2sh)) { |
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| 397 | 2 | throw new \RuntimeException('Unsupported pay-to-script-hash script'); |
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| 398 | } |
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| 399 | |||
| 400 | 22 | $sigChunks = array_slice($chunks, 0, -1); |
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| 401 | } |
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| 402 | |||
| 403 | 76 | if ($solution->getType() === ScriptType::P2WKH) { |
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| 404 | 8 | $sigVersion = SigHash::V1; |
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| 405 | 8 | $solution = $this->witnessKeyHash = $this->classifier->decode(ScriptFactory::scriptPubKey()->payToPubKeyHash($solution->getSolution())); |
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| 406 | 8 | $sigChunks = $witness; |
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| 407 | 70 | } else if ($solution->getType() === ScriptType::P2WSH) { |
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| 408 | 26 | $sigVersion = SigHash::V1; |
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| 409 | |||
| 410 | 26 | $witnessScript = null; |
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| 411 | 26 | if (count($witness) > 0) { |
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| 412 | 18 | $witnessScript = new Script($witness[count($witness) - 1]); |
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| 413 | } else { |
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| 414 | 22 | if (!$signData->hasWitnessScript()) { |
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| 415 | 4 | throw new \RuntimeException('Witness script not provided in sign data or witness'); |
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| 416 | } |
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| 417 | } |
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| 418 | |||
| 419 | 22 | if ($signData->hasWitnessScript()) { |
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| 420 | 22 | if ($witnessScript === null) { |
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| 421 | 18 | $witnessScript = $signData->getWitnessScript(); |
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| 422 | } else { |
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| 423 | 18 | if (!$witnessScript->equals($signData->getWitnessScript())) { |
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| 424 | 4 | throw new \RuntimeException('Extracted witnessScript did not match sign data'); |
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| 425 | } |
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| 426 | } |
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| 427 | } |
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| 428 | |||
| 429 | // Essentially all the reference implementation does |
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| 430 | 18 | if (!$witnessScript->getWitnessScriptHash()->equals($solution->getSolution())) { |
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| 431 | 2 | throw new \RuntimeException('Witness script fails to solve witness-script-hash'); |
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| 432 | } |
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| 433 | |||
| 434 | 16 | $solution = $this->witnessScript = $this->classifier->decode($witnessScript); |
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| 435 | 16 | if (!in_array($this->witnessScript->getType(), self::$canSign)) { |
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| 436 | 2 | throw new \RuntimeException('Unsupported witness-script-hash script'); |
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| 437 | } |
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| 438 | |||
| 439 | 14 | $sigChunks = array_slice($witness, 0, -1); |
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| 440 | } |
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| 441 | |||
| 442 | 64 | $this->sigVersion = $sigVersion; |
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| 443 | 64 | $this->signScript = $solution; |
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| 444 | |||
| 445 | 64 | $this->extractFromValues($solution, $sigChunks, $this->sigVersion); |
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| 446 | |||
| 447 | 58 | return $this; |
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| 448 | } |
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| 449 | |||
| 450 | /** |
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| 451 | * @param ScriptInterface $scriptCode |
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| 452 | * @param int $sigHashType |
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| 453 | * @param int $sigVersion |
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| 454 | * @return BufferInterface |
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| 455 | */ |
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| 456 | 54 | public function calculateSigHashUnsafe(ScriptInterface $scriptCode, $sigHashType, $sigVersion) |
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| 457 | { |
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| 458 | 54 | if (!$this->signatureChecker->isDefinedHashtype($sigHashType)) { |
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| 459 | 2 | throw new \RuntimeException('Invalid sigHashType requested'); |
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| 460 | } |
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| 461 | |||
| 462 | 52 | if ($sigVersion === SigHash::V1) { |
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| 463 | 22 | $hasher = new V1Hasher($this->tx, $this->txOut->getValue()); |
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| 464 | } else { |
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| 465 | 32 | $hasher = new Hasher($this->tx); |
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| 466 | } |
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| 467 | |||
| 468 | 52 | return $hasher->calculate($scriptCode, $this->nInput, $sigHashType); |
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| 469 | } |
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| 470 | |||
| 471 | /** |
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| 472 | * @param int $sigHashType |
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| 473 | * @return BufferInterface |
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| 474 | */ |
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| 475 | 14 | public function getSigHash($sigHashType) |
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| 479 | |||
| 480 | /** |
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| 481 | * @param PrivateKeyInterface $key |
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| 482 | * @param ScriptInterface $scriptCode |
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| 483 | * @param int $sigHashType |
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| 484 | * @param int $sigVersion |
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| 485 | * @return TransactionSignature |
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| 486 | */ |
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| 487 | 50 | private function calculateSignature(PrivateKeyInterface $key, ScriptInterface $scriptCode, $sigHashType, $sigVersion) |
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| 488 | { |
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| 489 | 50 | $hash = $this->calculateSigHashUnsafe($scriptCode, $sigHashType, $sigVersion); |
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| 490 | 50 | $ecSignature = $this->ecAdapter->sign($hash, $key, new Rfc6979($this->ecAdapter, $key, $hash, 'sha256')); |
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| 491 | 50 | return new TransactionSignature($this->ecAdapter, $ecSignature, $sigHashType); |
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| 492 | } |
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| 493 | |||
| 494 | /** |
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| 495 | * @return bool |
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| 496 | */ |
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| 497 | 56 | public function isFullySigned() |
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| 501 | |||
| 502 | /** |
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| 503 | * @return int |
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| 504 | */ |
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| 505 | 50 | public function getRequiredSigs() |
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| 509 | |||
| 510 | /** |
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| 511 | * @return TransactionSignatureInterface[] |
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| 512 | */ |
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| 513 | 50 | public function getSignatures() |
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| 514 | { |
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| 515 | 50 | return $this->signatures; |
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| 516 | } |
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| 517 | |||
| 518 | /** |
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| 519 | * @return PublicKeyInterface[] |
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| 520 | */ |
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| 521 | 50 | public function getPublicKeys() |
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| 525 | |||
| 526 | /** |
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| 527 | * @param PrivateKeyInterface $key |
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| 528 | * @param int $sigHashType |
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| 529 | * @return $this |
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| 530 | */ |
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| 531 | 56 | public function sign(PrivateKeyInterface $key, $sigHashType = SigHash::ALL) |
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| 571 | |||
| 572 | /** |
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| 573 | * @param int $flags |
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| 574 | * @return bool |
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| 575 | */ |
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| 576 | 50 | public function verify($flags = null) |
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| 608 | |||
| 609 | /** |
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| 610 | * @param string $outputType |
||
| 611 | * @return BufferInterface[] |
||
| 612 | */ |
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| 613 | 50 | private function serializeSolution($outputType) |
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| 635 | |||
| 636 | /** |
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| 637 | * @return SigValues |
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| 638 | */ |
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| 639 | 50 | public function serializeSignatures() |
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| 679 | } |
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| 680 |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: