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<?php |
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/** |
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* Simple extension-based MIME type guesser. |
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* |
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* @copyright 2018 Institute of Legal Medicine, Medical University of Innsbruck |
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* @author Andreas Erhard <[email protected]> |
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* @license LGPL-3.0-only |
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* @link http://www.gerichtsmedizin.at/ |
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* |
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* @package fileinfo |
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*/ |
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namespace Gmi\Toolkit\Fileinfo\Type; |
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/** |
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* Guesses the MIME type for a file based on the file extension. |
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*/ |
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class ExtensionMimeTypeGuesser |
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{ |
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/** |
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* @var array Map of extensions to MIME types. |
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*/ |
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private $map; |
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/** |
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* @var string Fallback MIME type if it can't be determined via the extension. |
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*/ |
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private $fallbackType = 'application/octet-stream'; |
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/** |
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* Constructor. |
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* |
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* @param TypeMapInterface[] $typeMaps |
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*/ |
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public function __construct(array $typeMaps = null) |
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{ |
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if (null === $typeMaps) { |
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$typeMaps = static::getDefaultTypeMaps(); |
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} |
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$this->map = $this->buildMap($typeMaps); |
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} |
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/** |
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* Returns the MIME type for a given file extension. |
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* For unknown extensions, "application/octet-stream" is returned. |
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* |
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* @param string $extension |
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* |
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* @return string |
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*/ |
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public function guess($extension) |
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{ |
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if (isset($this->map[$extension])) { |
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return $this->map[$extension]; |
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} |
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return $this->fallbackType; |
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} |
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/** |
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* Returns the default type maps. |
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* |
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* @return TypeMapInterface[] |
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*/ |
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public static function getDefaultTypeMaps() |
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{ |
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return [ |
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new DocumentTypeMap(), |
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new ImageTypeMap(), |
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new VideoTypeMap(), |
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new AudioTypeMap(), |
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new OpenDocumentTypeMap(), |
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new MsOfficeTypeMap(), |
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new SerializationTypeMap(), |
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new ArchiveTypeMap(), |
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new WebApplicationTypeMap(), |
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]; |
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} |
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/** |
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* Builds a lookup array from the type maps. |
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* |
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* @param TypeMapInterface[] $typeMaps |
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* |
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* @return array flat map array with the file extension as key and the MIME type as value |
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*/ |
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private function buildMap($typeMaps) |
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{ |
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$map = []; |
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$allTypeMaps = []; |
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foreach ($typeMaps as $typeMap) { |
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$allTypeMaps = array_merge($allTypeMaps, $typeMap->getMap()); |
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} |
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foreach ($allTypeMaps as $type) { |
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foreach ($type->getExtensions() as $extension) { |
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$map[$extension] = $type->getMimeType(); |
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} |
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} |
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return $map; |
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} |
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} |
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gmitirol /
toolkit-fileinfo
