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-rw-r--r--system/libraries/Upload.php84
1 files changed, 79 insertions, 5 deletions
diff --git a/system/libraries/Upload.php b/system/libraries/Upload.php
index 8f324de79..66e91c5b6 100644
--- a/system/libraries/Upload.php
+++ b/system/libraries/Upload.php
@@ -4,10 +4,22 @@
*
* An open source application development framework for PHP 5.1.6 or newer
*
+ * NOTICE OF LICENSE
+ *
+ * Licensed under the Open Software License version 3.0
+ *
+ * This source file is subject to the Open Software License (OSL 3.0) that is
+ * bundled with this package in the files license.txt / license.rst. It is
+ * also available through the world wide web at this URL:
+ * http://opensource.org/licenses/OSL-3.0
+ * If you did not receive a copy of the license and are unable to obtain it
+ * through the world wide web, please send an email to
+ * licensing@ellislab.com so we can send you a copy immediately.
+ *
* @package CodeIgniter
- * @author ExpressionEngine Dev Team
- * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
- * @license http://codeigniter.com/user_guide/license.html
+ * @author EllisLab Dev Team
+ * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. (http://ellislab.com/)
+ * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
@@ -21,7 +33,7 @@
* @package CodeIgniter
* @subpackage Libraries
* @category Uploads
- * @author ExpressionEngine Dev Team
+ * @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/libraries/file_uploading.html
*/
class CI_Upload {
@@ -198,7 +210,8 @@ class CI_Upload {
// Set the uploaded data as class variables
$this->file_temp = $_FILES[$field]['tmp_name'];
$this->file_size = $_FILES[$field]['size'];
- $this->file_type = preg_replace("/^(.+?);.*$/", "\\1", $_FILES[$field]['type']);
+ $this->_file_mime_type($_FILES[$field]);
+ $this->file_type = preg_replace("/^(.+?);.*$/", "\\1", $this->file_type);
$this->file_type = strtolower(trim(stripslashes($this->file_type), '"'));
$this->file_name = $this->_prep_filename($_FILES[$field]['name']);
$this->file_ext = $this->get_extension($this->file_name);
@@ -1008,6 +1021,67 @@ class CI_Upload {
// --------------------------------------------------------------------
+ /**
+ * File MIME type
+ *
+ * Detects the (actual) MIME type of the uploaded file, if possible.
+ * The input array is expected to be $_FILES[$field]
+ *
+ * @param array
+ * @return void
+ */
+ protected function _file_mime_type($file)
+ {
+ // Use if the Fileinfo extension, if available (only versions above 5.3 support the FILEINFO_MIME_TYPE flag)
+ if ( (float) substr(phpversion(), 0, 3) >= 5.3 && function_exists('finfo_file'))
+ {
+ $finfo = new finfo(FILEINFO_MIME_TYPE);
+ if ($finfo !== FALSE) // This is possible, if there is no magic MIME database file found on the system
+ {
+ $file_type = $finfo->file($file['tmp_name']);
+
+ /* According to the comments section of the PHP manual page,
+ * it is possible that this function returns an empty string
+ * for some files (e.g. if they don't exist in the magic MIME database)
+ */
+ if (strlen($file_type) > 1)
+ {
+ $this->file_type = $file_type;
+ return;
+ }
+ }
+ }
+
+ // Fall back to the deprecated mime_content_type(), if available
+ if (function_exists('mime_content_type'))
+ {
+ $this->file_type = @mime_content_type($file['tmp_name']);
+ return;
+ }
+
+ /* This is an ugly hack, but UNIX-type systems provide a native way to detect the file type,
+ * which is still more secure than depending on the value of $_FILES[$field]['type'].
+ *
+ * Notes:
+ * - a 'W' in the substr() expression bellow, would mean that we're using Windows
+ * - many system admins would disable the exec() function due to security concerns, hence the function_exists() check
+ */
+ if (DIRECTORY_SEPARATOR !== '\\' && function_exists('exec'))
+ {
+ $output = array();
+ @exec('file --brief --mime-type ' . escapeshellarg($file['tmp_path']), $output, $return_code);
+ if ($return_code === 0 && strlen($output[0]) > 0) // A return status code != 0 would mean failed execution
+ {
+ $this->file_type = rtrim($output[0]);
+ return;
+ }
+ }
+
+ $this->file_type = $file['type'];
+ }
+
+ // --------------------------------------------------------------------
+
}
// END Upload Class