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<?php |
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namespace Storeman; |
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use Clue\StreamFilter; |
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use Storeman\Config\Configuration; |
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use Storeman\Hash\AggregateHashAlgorithm; |
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use Storeman\Hash\Algorithm\HashAlgorithmInterface; |
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use Storeman\Index\IndexObject; |
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/** |
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* Provides read streams for index objects. |
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*/ |
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class FileReader |
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{ |
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/** |
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* @var Configuration |
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*/ |
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protected $configuration; |
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/** |
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* @var HashAlgorithmInterface[] |
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*/ |
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protected $hashFunctions; |
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public function __construct(Configuration $configuration, array $hashFunctions) |
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{ |
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$this->configuration = $configuration; |
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$this->hashFunctions = $hashFunctions; |
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} |
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/** |
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* Returns a readable stream for the given file index object. |
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* |
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* @param IndexObject $indexObject |
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* @return resource |
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*/ |
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public function getReadStream(IndexObject $indexObject) |
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{ |
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assert($indexObject->isFile()); |
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$absolutePath = "{$this->configuration->getPath()}/{$indexObject->getRelativePath()}"; |
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$stream = fopen($absolutePath, 'rb'); |
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if ($stream === false) |
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{ |
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throw new Exception("fopen() failed for '{$absolutePath}'"); |
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} |
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$this->setupStreamHashing($stream, $indexObject); |
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return $stream; |
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} |
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/** |
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* Sets up transparent file hashing. |
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* |
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* @param resource $stream |
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* @param IndexObject $indexObject |
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*/ |
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protected function setupStreamHashing($stream, IndexObject $indexObject) |
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{ |
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$knownHashes = iterator_to_array($indexObject->getHashes()); |
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$configuredHashes = $this->configuration->getFileChecksums(); |
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if ($missingHashes = array_diff_key($configuredHashes, $knownHashes)) |
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{ |
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$aggregateHashAlgorithm = new AggregateHashAlgorithm(array_intersect_key($this->hashFunctions, array_flip($missingHashes))); |
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$aggregateHashAlgorithm->initialize(); |
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StreamFilter\prepend($stream, function(string $chunk = null) use ($aggregateHashAlgorithm, $indexObject) { |
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// eof |
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if ($chunk === null) |
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{ |
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$hashes = $aggregateHashAlgorithm->finalize(); |
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foreach ($hashes as $algorithm => $hash) |
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{ |
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$indexObject->getHashes()->addHash($algorithm, $hash); |
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} |
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} |
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// digest chunk |
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else |
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{ |
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$aggregateHashAlgorithm->digest($chunk); |
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} |
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return $chunk; |
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}); |
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} |
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} |
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} |
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storeman-io /
storeman
