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<?php |
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namespace SilverStripe\TextExtraction\Extractor; |
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use SilverStripe\Assets\File; |
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/** |
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* Enables text extraction of file content via the Tika CLI |
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* |
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* {@link http://tika.apache.org/1.7/gettingstarted.html} |
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*/ |
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class TikaTextExtractor extends FileTextExtractor |
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{ |
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/** |
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* Text extraction mode. Defaults to -t (plain text) |
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* |
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* @var string |
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* @config |
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*/ |
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private static $output_mode = '-t'; |
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/** |
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* Get the version of tika installed, or 0 if not installed |
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* |
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* @return mixed float | int The version of tika |
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*/ |
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public function getVersion() |
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{ |
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$code = $this->runShell('tika --version', $stdout); |
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// Parse output |
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if (!$code && preg_match('/Apache Tika (?<version>[\.\d]+)/', $stdout, $matches)) { |
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return $matches['version']; |
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} |
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return 0; |
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} |
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/** |
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* Runs an arbitrary and safely escaped shell command |
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* |
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* @param string $command Full command including arguments |
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* @param string &$stdout Standand output |
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* @param string &$stderr Standard error |
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* @param string $input Content to pass via standard input |
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* @return int Exit code. 0 is success |
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*/ |
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protected function runShell($command, &$stdout = '', &$stderr = '', $input = '') |
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{ |
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$descriptorSpecs = [ |
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0 => ["pipe", "r"], |
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1 => ["pipe", "w"], |
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2 => ["pipe", "w"] |
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]; |
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// Invoke command |
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$pipes = []; |
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$proc = proc_open($command, $descriptorSpecs, $pipes); |
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if (!is_resource($proc)) { |
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return 255; |
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} |
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// Send content as input |
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fwrite($pipes[0], $input); |
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fclose($pipes[0]); |
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// Get output |
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$stdout = stream_get_contents($pipes[1]); |
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fclose($pipes[1]); |
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$stderr = stream_get_contents($pipes[2]); |
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fclose($pipes[2]); |
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// Get result |
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return proc_close($proc); |
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} |
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public function getContent($file) |
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{ |
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$mode = $this->config()->get('output_mode'); |
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$path = $file instanceof File ? $this->getPathFromFile($file) : $file; |
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$command = sprintf('tika %s %s', $mode, escapeshellarg($path)); |
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$code = $this->runShell($command, $output); |
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if ($code == 0) { |
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return $output; |
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} |
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} |
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/** |
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* @return bool |
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*/ |
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public function isAvailable() |
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{ |
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return $this->getVersion() > 0; |
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} |
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/** |
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* @return bool |
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*/ |
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public function supportsExtension($extension) |
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{ |
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// Determine support via mime type only |
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return false; |
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} |
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/** |
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* @param string $mime |
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* @return bool |
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*/ |
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public function supportsMime($mime) |
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{ |
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// Get list of supported mime types |
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$code = $this->runShell('tika --list-supported-types', $supportedTypes, $error); |
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if ($code) { |
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// Error case |
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return false; |
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} |
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// Check if the mime type is inside the result |
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$pattern = sprintf('/\b(%s)\b/', preg_quote($mime, '/')); |
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return (bool)preg_match($pattern, $supportedTypes); |
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} |
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} |
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silverstripe /
silverstripe-textextraction
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