mimedetect.module in MimeDetect 7

Provide server side mime type detection.

File

mimedetect.module

<?php

/**
 * @file
 * Provide server side mime type detection.
 */

/**
 * Implements hook_menu().
 */
function mimedetect_menu() {
  $items = array();

  // The admin settings form.
  $items['admin/config/media/mimedetect'] = array(
    'title' => 'Mime type detection',
    'description' => 'Control how the mime type of uploaded files will be determined.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array(
      'mimedetect_settings',
    ),
    'access arguments' => array(
      'administer site configuration',
    ),
    'file' => 'mimedetect.admin.inc',
  );
  return $items;
}

/**
 * Detect File Mime Type.
 *
 * @param object $file
 *   A standard Drupal file object. The uri property is used to locate the file
 *   and if the mime detection fails, the mimetype property is returned.
 *
 * @return string
 *   Containing the file's MIME type.
 */
function mimedetect_mime($file) {
  $file = (object) $file;
  $mime = FALSE;

  // Try to use the fileinfo extension first.
  if (variable_get('mimedetect_enable_file_info', FALSE) && extension_loaded('fileinfo')) {
    $magic_file = variable_get('mimedetect_magic', '');
    static $finfo = FALSE;
    if ($finfo || ($finfo = @finfo_open(FILEINFO_MIME, $magic_file))) {
      $mime = finfo_file($finfo, drupal_realpath($file->uri));
    }
  }

  // Try the 'file' binary.
  if ((!$mime || $mime == 'application/octet-stream') && variable_get('mimedetect_enable_file_binary', FALSE) && ($filebin = variable_get('mimedetect_file_binary', '/usr/bin/file')) && basename($filebin) == 'file' && is_executable($filebin)) {

    // On OSX the -i switch is -I, so if we use the long flags everyone is
    // happy. I checked back to version 3.41 and it still supports the long
    // names but if you run into problems you can use " -bi ".
    $command = $filebin . ' --brief --mime' . (!empty($magic_file) ? ' --magic-file=' . escapeshellarg($magic_file) : '') . ' ' . escapeshellarg(drupal_realpath($file->uri));
    $mime = trim(exec($command));
  }

  // With text we often get charset like 'text/plain; charset=us-ascii'.
  $mime = explode(';', $mime);
  $mime = trim($mime[0]);

  // If it was unable to determine the file MIME type, fallback to the core
  // MIME mapping based on file name extension.
  if (!$mime || $mime == 'application/octet-stream') {
    $mime = file_get_mimetype($file->filename);
  }
  return $mime;
}

Functions

Name	Description
mimedetect_menu	Implements hook_menu().
mimedetect_mime	Detect File Mime Type.