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<?php |
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declare(strict_types=1); |
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/** |
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* Saito - The Threaded Web Forum |
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* |
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* @copyright Copyright (c) the Saito Project Developers |
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* @link https://github.com/Schlaefer/Saito |
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* @license http://opensource.org/licenses/MIT |
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*/ |
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namespace ImageUploader\Lib; |
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use Cake\Core\Configure; |
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use Cake\Filesystem\File; |
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/** |
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* Determine mime-type for a file and try to fix some common mime-type issues. |
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*/ |
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class MimeType |
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{ |
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/** @var array [<wrong type> => [<file .ext> => <right type>]] */ |
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private static $conversion = [ |
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'application/octet-stream' => [ |
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'mp4' => 'video/mp4', |
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], |
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]; |
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/** |
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* Get mime-type |
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* |
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* @param string $filepath File path on server to check the actual file |
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* @param string|null $name Original file name with original extension |
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* @return string Determined mime-type |
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*/ |
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public static function get(string $filepath, ?string $name): string |
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{ |
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$file = new File($filepath); |
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if (!$file->exists()) { |
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throw new \RuntimeException( |
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sprintf('File "%s" does not exists.', $filepath), |
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1570856931 |
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); |
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} |
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$type = $file->mime(); |
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if (!$type) { |
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throw new \RuntimeException( |
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sprintf('Cannot determine mime-type for file "%s".', $filepath), |
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1570856932 |
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); |
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} |
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$name = $name ?: $file->pwd(); |
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$type = self::fixByFileExtension($type, $name); |
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return $type; |
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} |
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/** |
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* Fix type based on filename extension |
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* |
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* @param string $type original mime-type |
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* @param string $filename path to file for filename |
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* @return string fixed mime-type |
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*/ |
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private static function fixByFileExtension(string $type, string $filename): string |
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{ |
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// Check that mime-type has an .extension based fix. |
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if (array_key_exists($type, self::$conversion)) { |
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$UploaderConfig = Configure::read('Saito.Settings.uploader'); |
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$fileExtension = strtolower(pathinfo($filename, PATHINFO_EXTENSION)); |
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$conversion = self::$conversion[$type]; |
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foreach ($conversion as $extension => $newType) { |
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// Check that file has the matching .extension. |
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if ($fileExtension !== $extension) { |
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continue; |
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} |
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// Check that the mime-type wich is considered a fix is allowed |
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// at all. |
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if (!$UploaderConfig->hasType($newType)) { |
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continue; |
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} |
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$type = $newType; |
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break; |
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} |
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} |
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return $type; |
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} |
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} |
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Schlaefer /
Saito
In PHP, under loose comparison (like
==, or!=, orswitchconditions), values of different types might be equal.For
stringvalues, the empty string''is a special case, in particular the following results might be unexpected: