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<?php |
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namespace Mohamedahmed01\SimpleMerkele; |
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use Mohamedahmed01\SimpleMerkele\Types\HashValidation; |
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use Mohamedahmed01\SimpleMerkele\Exceptions\InvalidArrayModeException; |
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use Mohamedahmed01\SimpleMerkele\Exceptions\OddHashInventoryException; |
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use Mohamedahmed01\SimpleMerkele\Exceptions\HashInventoryEmptyException; |
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final class SimpleMerkele |
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{ |
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private $inventory = []; |
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private $topHash = ''; |
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private $array_mode = 2; |
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private $hashing_algo = 'sha256'; |
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public const ALLOW_ODD_ARRAYS = 1; |
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public const DIS_ALLOW_ODD_ARRAYS = 2; |
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public function __construct($array_mode=2, $hashing_algo='sha256') |
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{ |
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$this->validateArrayMode($array_mode); |
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$this->array_mode = $array_mode; |
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HashValidation::validHashingAlgo($hashing_algo); |
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$this->hashing_algo=$hashing_algo; |
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} |
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public function addHash(String $hash) |
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{ |
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$this->validateHash($hash, $this->hashing_algo); |
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$this->inventory[]=$hash; |
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} |
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public function calculateTree():string |
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{ |
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$this->validateInventory(); |
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$this->reduceTree($this->inventory, []); |
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return $this->topHash; |
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} |
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public function resetTree() |
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{ |
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$this->inventory=[]; |
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$this->topHash = ''; |
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} |
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private function reduceTree($treeInventory, $nodeHashesMemo=[]) |
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{ |
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$nodeHashes=$nodeHashesMemo; |
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if (count($treeInventory)<=0) { |
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$treeInventory=$nodeHashes; |
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$nodeHashes=[]; |
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if (count($treeInventory) <= 1 &&empty($nodeHashes)) { |
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$this->topHash=array_pop($treeInventory); |
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return; |
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} |
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if (!(count($treeInventory)%2===0)) { |
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$treeInventory[]=$treeInventory[count($treeInventory)-1]; |
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} |
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} |
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$nodeHashes[] = hash($this->hashing_algo, array_pop($treeInventory).array_pop($treeInventory)); |
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$this->reduceTree($treeInventory, $nodeHashes); |
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} |
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/** |
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* @SuppressWarnings(PHPMD.StaticAccess) |
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*/ |
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private function validateHash(String $hash, String $type) |
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{ |
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HashValidation::validateHashString($hash); |
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HashValidation::checkHashLength($hash, $type); |
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} |
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private function validateInventory() |
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{ |
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if (empty($this->inventory)) { |
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throw new HashInventoryEmptyException(); |
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} |
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$isOddArray = count($this->inventory)%2 !== 0; |
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if ($this->array_mode === self::ALLOW_ODD_ARRAYS && $isOddArray) { |
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$this->inventory[]=$this->inventory[count($this->inventory)-1]; |
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} elseif ($this->array_mode === self::DIS_ALLOW_ODD_ARRAYS && $isOddArray) { |
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throw new OddHashInventoryException(); |
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} |
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} |
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private function validateArrayMode($array_mode) |
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{ |
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if (!in_array( |
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$array_mode, |
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[self::ALLOW_ODD_ARRAYS,self::DIS_ALLOW_ODD_ARRAYS], |
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true |
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)) { |
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throw new InvalidArrayModeException(); |
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} |
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} |
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} |
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mohamedahmed01 /
simple-merkele
