<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Mime;
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use Symfony\Component\Mime\Exception\InvalidArgumentException;
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use Symfony\Component\Mime\Exception\LogicException;
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/**
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* Guesses the MIME type using the PECL extension FileInfo.
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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class FileinfoMimeTypeGuesser implements MimeTypeGuesserInterface
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{
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private $magicFile;
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/**
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* @param string $magicFile A magic file to use with the finfo instance
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*
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* @see http://www.php.net/manual/en/function.finfo-open.php
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*/
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public function __construct(string $magicFile = null)
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{
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$this->magicFile = $magicFile;
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}
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/**
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* {@inheritdoc}
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*/
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public function isGuesserSupported(): bool
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{
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return \function_exists('finfo_open');
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}
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/**
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* {@inheritdoc}
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*/
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public function guessMimeType(string $path): ?string
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{
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if (!is_file($path) || !is_readable($path)) {
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throw new InvalidArgumentException(sprintf('The "%s" file does not exist or is not readable.', $path));
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}
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if (!$this->isGuesserSupported()) {
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throw new LogicException(sprintf('The "%s" guesser is not supported.', __CLASS__));
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}
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if (false === $finfo = new \finfo(\FILEINFO_MIME_TYPE, $this->magicFile)) {
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return null;
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}
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$mimeType = $finfo->file($path);
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if ($mimeType && 0 === (\strlen($mimeType) % 2)) {
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$mimeStart = substr($mimeType, 0, \strlen($mimeType) >> 1);
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$mimeType = $mimeStart.$mimeStart === $mimeType ? $mimeStart : $mimeType;
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}
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return $mimeType;
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}
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}
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