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<?php |
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namespace TreeHouse\Feeder\Resource\Transformer; |
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use TreeHouse\Feeder\Resource\FileResource; |
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use TreeHouse\Feeder\Resource\ResourceCollection; |
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use TreeHouse\Feeder\Resource\ResourceInterface; |
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use TreeHouse\Feeder\Transport\FileTransport; |
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/** |
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* Strips all control characters from the resource, except space characters. |
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*/ |
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class RemoveControlCharactersTransformer implements ResourceTransformerInterface |
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{ |
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/** |
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* @var int |
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*/ |
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protected $length; |
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/** |
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* @param int $length The number of bytes to read/write while processing the resource |
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*/ |
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public function __construct($length = 8192) |
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{ |
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$this->length = intval($length); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function transform(ResourceInterface $resource, ResourceCollection $collection) |
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{ |
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$file = $resource->getFile()->getPathname(); |
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$tmpFile = tempnam(sys_get_temp_dir(), $file); |
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// remove control characters |
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$old = fopen($file, 'r'); |
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$new = fopen($tmpFile, 'w'); |
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// list control characters, but leave out \t\r\n |
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$chars = array_map('chr', range(0, 31)); |
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$chars[] = chr(127); |
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unset($chars[9], $chars[10], $chars[13]); |
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while (!feof($old)) { |
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fwrite($new, str_replace($chars, '', fread($old, $this->length))); |
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} |
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fclose($old); |
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fclose($new); |
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// atomic write |
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$this->rename($tmpFile, $file); |
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$transport = FileTransport::create($file); |
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if ($resource->getTransport()) { |
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$transport->setDestinationDir($resource->getTransport()->getDestinationDir()); |
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} |
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return new FileResource($transport); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function needsTransforming(ResourceInterface $resource) |
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{ |
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return true; |
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} |
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/** |
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* @param string $old |
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* @param string $new |
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* |
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* @throws \RuntimeException |
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*/ |
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protected function rename($old, $new) |
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{ |
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if (!rename($old, $new)) { |
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throw new \RuntimeException(sprintf('Could not rename %s to %s', $old, $new)); |
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} |
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} |
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} |
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treehouselabs /
feeder
