<?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 with the binary "file" (only available on *nix).
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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class FileBinaryMimeTypeGuesser implements MimeTypeGuesserInterface
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{
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private $cmd;
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/**
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* The $cmd pattern must contain a "%s" string that will be replaced
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* with the file name to guess.
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*
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* The command output must start with the MIME type of the file.
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*
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* @param string $cmd The command to run to get the MIME type of a file
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*/
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public function __construct(string $cmd = 'file -b --mime -- %s 2>/dev/null')
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{
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$this->cmd = $cmd;
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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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static $supported = null;
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if (null !== $supported) {
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return $supported;
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}
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if ('\\' === \DIRECTORY_SEPARATOR || !\function_exists('passthru') || !\function_exists('escapeshellarg')) {
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return $supported = false;
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}
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ob_start();
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passthru('command -v file', $exitStatus);
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$binPath = trim(ob_get_clean());
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return $supported = 0 === $exitStatus && '' !== $binPath;
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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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ob_start();
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// need to use --mime instead of -i. see #6641
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passthru(sprintf($this->cmd, escapeshellarg((str_starts_with($path, '-') ? './' : '').$path)), $return);
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if ($return > 0) {
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ob_end_clean();
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return null;
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}
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$type = trim(ob_get_clean());
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if (!preg_match('#^([a-z0-9\-]+/[a-z0-9\-\+\.]+)#i', $type, $match)) {
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// it's not a type, but an error message
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return null;
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}
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return $match[1];
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}
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}
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