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<?php |
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namespace SilverStripe\TextExtraction\Extractor; |
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use Exception; |
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use GuzzleHttp\Client; |
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use GuzzleHttp\Psr7\Response; |
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use InvalidArgumentException; |
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use Psr\Log\LoggerInterface; |
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use SilverStripe\Assets\File; |
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use SilverStripe\Core\Injector\Injector; |
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/** |
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* Text extractor that calls an Apache Solr instance |
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* and extracts content via the "ExtractingRequestHandler" endpoint. |
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* Does not alter the Solr index itself, but uses it purely |
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* for its file parsing abilities. |
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* |
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* @author ischommer |
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* @see http://wiki.apache.org/solr/ExtractingRequestHandler |
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*/ |
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class SolrCellTextExtractor extends FileTextExtractor |
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{ |
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/** |
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* Base URL to use for Solr text extraction. |
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* E.g. http://localhost:8983/solr/update/extract |
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* |
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* @config |
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* @var string |
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*/ |
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private static $base_url; |
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/** |
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* @var int |
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* @config |
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*/ |
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private static $priority = 75; |
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/** |
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* @var Client |
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*/ |
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protected $httpClient; |
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/** |
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* @return Client |
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*/ |
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public function getHttpClient() |
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{ |
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if (!$this->httpClient) { |
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$this->httpClient = new Client(); |
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} |
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return $this->httpClient; |
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} |
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/** |
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* @param Client $client |
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* @return $this |
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*/ |
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public function setHttpClient(Client $client) |
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{ |
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$this->httpClient = $client; |
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return $this; |
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} |
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/** |
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* @return string |
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*/ |
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public function isAvailable() |
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{ |
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$url = $this->config()->get('base_url'); |
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return (bool) $url; |
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} |
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/** |
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* @param string $extension |
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* @return bool |
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*/ |
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public function supportsExtension($extension) |
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{ |
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return in_array( |
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strtolower($extension), |
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[ |
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'pdf', 'doc', 'docx', 'xls', 'xlsx', |
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'epub', 'rtf', 'odt', 'fodt', 'ods', 'fods', |
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'ppt', 'pptx', 'odp', 'fodp', 'csv' |
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] |
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); |
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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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// Rely on supportsExtension |
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return false; |
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} |
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/** |
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* @param File|string $file |
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* @return string |
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* @throws InvalidArgumentException |
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*/ |
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public function getContent($file) |
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{ |
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if (!$file || (is_string($file) && !file_exists($file))) { |
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// no file |
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return ''; |
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} |
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$fileName = $file instanceof File ? $file->getFilename() : basename($file); |
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$client = $this->getHttpClient(); |
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// Get and validate base URL |
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$baseUrl = $this->config()->get('base_url'); |
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if (!$this->config()->get('base_url')) { |
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throw new InvalidArgumentException('SolrCellTextExtractor.base_url not specified'); |
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} |
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try { |
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$stream = $file instanceof File ? $file->getStream() : fopen($file, 'r'); |
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/** @var Response $response */ |
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$response = $client |
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->post($baseUrl, [ |
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'multipart' => [ |
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['name' => 'extractOnly', 'contents' => 'true'], |
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['name' => 'extractFormat', 'contents' => 'text'], |
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['name' => 'myfile', 'contents' => $stream], |
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] |
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]); |
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} catch (InvalidArgumentException $e) { |
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$msg = sprintf( |
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'Error extracting text from "%s" (message: %s)', |
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$fileName, |
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$e->getMessage() |
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); |
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Injector::inst()->get(LoggerInterface::class)->notice($msg); |
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return null; |
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} catch (Exception $e) { |
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// Catch other errors that Tika can throw via Guzzle but are not caught and break Solr search |
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// query in some cases. |
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$msg = sprintf( |
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'Tika server error attempting to extract from "%s" (message: %s)', |
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$fileName, |
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$e->getMessage() |
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); |
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Injector::inst()->get(LoggerInterface::class)->notice($msg); |
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return null; |
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} |
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$matches = []; |
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// Use preg match to avoid SimpleXML running out of memory on large text nodes |
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preg_match( |
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sprintf('/\<str name\="%s"\>(.*?)\<\/str\>/s', preg_quote($fileName)), |
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(string)$response->getBody(), |
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$matches |
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); |
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return $matches ? $matches[1] : null; |
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} |
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} |
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silverstripe /
silverstripe-textextraction
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