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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* 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 license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Validate
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id$
*/
/**
* @see Zend_Validate_Abstract
*/
require_once 'Zend/Validate/Abstract.php';
/**
* Validator for the mime type of a file
*
* @category Zend
* @package Zend_Validate
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Validate_File_MimeType extends Zend_Validate_Abstract
{
/**
* @const Error type constants
*/
const FALSE_TYPE = 'fileMimeTypeFalse';
const NOT_DETECTED = 'fileMimeTypeNotDetected';
const NOT_READABLE = 'fileMimeTypeNotReadable';
/**
* @var array Error message templates
*/
protected $_messageTemplates = array(
self::FALSE_TYPE => "File '%value%' has a false mimetype of '%type%'",
self::NOT_DETECTED => "The mimetype of file '%value%' could not be detected",
self::NOT_READABLE => "File '%value%' is not readable or does not exist",
);
/**
* @var array
*/
protected $_messageVariables = array(
'type' => '_type'
);
/**
* @var string
*/
protected $_type;
/**
* Mimetypes
*
* If null, there is no mimetype
*
* @var string|null
*/
protected $_mimetype;
/**
* Magicfile to use
*
* @var string|null
*/
protected $_magicfile;
/**
* Finfo object to use
*
* @var resource
*/
protected $_finfo;
/**
* If no $_ENV['MAGIC'] is set, try and autodiscover it based on common locations
* @var array
*/
protected $_magicFiles = array(
'/usr/share/misc/magic',
'/usr/share/misc/magic.mime',
'/usr/share/misc/magic.mgc',
'/usr/share/mime/magic',
'/usr/share/mime/magic.mime',
'/usr/share/mime/magic.mgc',
'/usr/share/file/magic',
'/usr/share/file/magic.mime',
'/usr/share/file/magic.mgc',
);
/**
* Indicates whether use of $_magicFiles should be attempted.
* @var boolean
*/
protected $_tryCommonMagicFiles = true;
/**
* Option to allow header check
*
* @var boolean
*/
protected $_headerCheck = false;
/**
* Holds error information returned by finfo_open
*
* @var array
*/
protected $_finfoError;
/**
* Sets validator options
*
* Mimetype to accept
*
* @param string|array $mimetype MimeType
* @return void
*/
public function __construct($mimetype)
{
if ($mimetype instanceof Zend_Config) {
$mimetype = $mimetype->toArray();
} elseif (is_string($mimetype)) {
$mimetype = explode(',', $mimetype);
} elseif (!is_array($mimetype)) {
require_once 'Zend/Validate/Exception.php';
throw new Zend_Validate_Exception("Invalid options to validator provided");
}
if (isset($mimetype['magicfile'])) {
$this->setMagicFile($mimetype['magicfile']);
unset($mimetype['magicfile']);
}
if (isset($mimetype['headerCheck'])) {
$this->enableHeaderCheck($mimetype['headerCheck']);
unset($mimetype['headerCheck']);
}
$this->setMimeType($mimetype);
}
/**
* Returns the actual set magicfile
*
* Note that for PHP 5.3.0 or higher, we don't use $_ENV['MAGIC'] or try to
* find a magic file in a common location as PHP now has a built-in internal
* magic file.
*
* @return string
*/
public function getMagicFile()
{
if (version_compare(PHP_VERSION, '5.3.0', '<')
&& null === $this->_magicfile) {
if (!empty($_ENV['MAGIC'])) {
$this->setMagicFile($_ENV['MAGIC']);
} elseif (
!(@ini_get("safe_mode") == 'On' || @ini_get("safe_mode") === 1)
&& $this->shouldTryCommonMagicFiles() // @see ZF-11784
) {
require_once 'Zend/Validate/Exception.php';
foreach ($this->_magicFiles as $file) {
// supressing errors which are thrown due to openbase_dir restrictions
try {
$this->setMagicFile($file);
if ($this->_magicfile !== null) {
break;
}
} catch (Zend_Validate_Exception $e) {
// Intentionally, catch and fall through
}
}
}
if ($this->_magicfile === null) {
$this->_magicfile = false;
}
}
return $this->_magicfile;
}
/**
* Sets the magicfile to use
* if null, the MAGIC constant from php is used
* if the MAGIC file is errorous, no file will be set
*
* @param string $file
* @throws Zend_Validate_Exception When finfo can not read the magicfile
* @return Zend_Validate_File_MimeType Provides fluid interface
*/
public function setMagicFile($file)
{
if (empty($file)) {
$this->_magicfile = null;
} else if (!(class_exists('finfo', false))) {
$this->_magicfile = null;
require_once 'Zend/Validate/Exception.php';
throw new Zend_Validate_Exception('Magicfile can not be set. There is no finfo extension installed');
} else if (!is_file($file) || !is_readable($file)) {
require_once 'Zend/Validate/Exception.php';
throw new Zend_Validate_Exception('The given magicfile can not be read');
} else {
$const = defined('FILEINFO_MIME_TYPE') ? FILEINFO_MIME_TYPE : FILEINFO_MIME;
set_error_handler(array($this, '_errorHandler'), E_NOTICE | E_WARNING);
$this->_finfo = finfo_open($const, $file);
restore_error_handler();
if (empty($this->_finfo)) {
$this->_finfo = null;
require_once 'Zend/Validate/Exception.php';
throw new Zend_Validate_Exception(
sprintf('The given magicfile ("%s") is not accepted by finfo', $file),
null,
$this->_finfoError
);
} else {
$this->_magicfile = $file;
}
}
return $this;
}
/**
* Enables or disables attempts to try the common magic file locations
* specified by Zend_Validate_File_MimeType::_magicFiles
*
* @param boolean $flag
* @return Zend_Validate_File_MimeType Provides fluent interface
* @see http://framework.zend.com/issues/browse/ZF-11784
*/
public function setTryCommonMagicFilesFlag($flag = true)
{
$this->_tryCommonMagicFiles = (boolean) $flag;
return $this;
}
/**
* Accessor for Zend_Validate_File_MimeType::_magicFiles
*
* @return boolean
* @see http://framework.zend.com/issues/browse/ZF-11784
*/
public function shouldTryCommonMagicFiles()
{
return $this->_tryCommonMagicFiles;
}
/**
* Returns the Header Check option
*
* @return boolean
*/
public function getHeaderCheck()
{
return $this->_headerCheck;
}
/**
* Defines if the http header should be used
* Note that this is unsave and therefor the default value is false
*
* @param boolean $checkHeader
* @return Zend_Validate_File_MimeType Provides fluid interface
*/
public function enableHeaderCheck($headerCheck = true)
{
$this->_headerCheck = (boolean) $headerCheck;
return $this;
}
/**
* Returns the set mimetypes
*
* @param boolean $asArray Returns the values as array, when false an concated string is returned
* @return string|array
*/
public function getMimeType($asArray = false)
{
$asArray = (bool) $asArray;
$mimetype = (string) $this->_mimetype;
if ($asArray) {
$mimetype = explode(',', $mimetype);
}
return $mimetype;
}
/**
* Sets the mimetypes
*
* @param string|array $mimetype The mimetypes to validate
* @return Zend_Validate_File_Extension Provides a fluent interface
*/
public function setMimeType($mimetype)
{
$this->_mimetype = null;
$this->addMimeType($mimetype);
return $this;
}
/**
* Adds the mimetypes
*
* @param string|array $mimetype The mimetypes to add for validation
* @return Zend_Validate_File_Extension Provides a fluent interface
*/
public function addMimeType($mimetype)
{
$mimetypes = $this->getMimeType(true);
if (is_string($mimetype)) {
$mimetype = explode(',', $mimetype);
} elseif (!is_array($mimetype)) {
require_once 'Zend/Validate/Exception.php';
throw new Zend_Validate_Exception("Invalid options to validator provided");
}
if (isset($mimetype['magicfile'])) {
unset($mimetype['magicfile']);
}
foreach ($mimetype as $content) {
if (empty($content) || !is_string($content)) {
continue;
}
$mimetypes[] = trim($content);
}
$mimetypes = array_unique($mimetypes);
// Sanity check to ensure no empty values
foreach ($mimetypes as $key => $mt) {
if (empty($mt)) {
unset($mimetypes[$key]);
}
}
$this->_mimetype = implode(',', $mimetypes);
return $this;
}
/**
* Defined by Zend_Validate_Interface
*
* Returns true if the mimetype of the file matches the given ones. Also parts
* of mimetypes can be checked. If you give for example "image" all image
* mime types will be accepted like "image/gif", "image/jpeg" and so on.
*
* @param string $value Real file to check for mimetype
* @param array $file File data from Zend_File_Transfer
* @return boolean
*/
public function isValid($value, $file = null)
{
if ($file === null) {
$file = array(
'type' => null,
'name' => $value
);
}
// Is file readable ?
require_once 'Zend/Loader.php';
if (!Zend_Loader::isReadable($value)) {
return $this->_throw($file, self::NOT_READABLE);
}
$this->_type = $this->_detectMimeType($value);
if (empty($this->_type) && $this->_headerCheck) {
$this->_type = $file['type'];
}
if (empty($this->_type)) {
return $this->_throw($file, self::NOT_DETECTED);
}
$mimetype = $this->getMimeType(true);
if (in_array($this->_type, $mimetype)) {
return true;
}
$types = explode('/', $this->_type);
$types = array_merge($types, explode('-', $this->_type));
$types = array_merge($types, explode(';', $this->_type));
foreach($mimetype as $mime) {
if (in_array($mime, $types)) {
return true;
}
}
return $this->_throw($file, self::FALSE_TYPE);
}
/**
* Throws an error of the given type
*
* @param string $file
* @param string $errorType
* @return false
*/
protected function _throw($file, $errorType)
{
$this->_value = $file['name'];
$this->_error($errorType);
return false;
}
/**
* Try to detect mime type of given file.
* @param string $file File which mime type should be detected
* @return string File mime type or null if not detected
*/
protected function _detectMimeType($file)
{
$mimefile = $this->getMagicFile();
$type = null;
if (class_exists('finfo', false)) {
$const = defined('FILEINFO_MIME_TYPE') ? FILEINFO_MIME_TYPE : FILEINFO_MIME;
if (!empty($mimefile) && empty($this->_finfo)) {
set_error_handler(array($this, '_errorHandler'), E_NOTICE | E_WARNING);
$this->_finfo = finfo_open($const, $mimefile);
restore_error_handler();
}
if (empty($this->_finfo)) {
set_error_handler(array($this, '_errorHandler'), E_NOTICE | E_WARNING);
$this->_finfo = finfo_open($const);
restore_error_handler();
}
if (!empty($this->_finfo)) {
$type = finfo_file($this->_finfo, $file);
}
}
if (empty($type) &&
(function_exists('mime_content_type') && ini_get('mime_magic.magicfile'))) {
$type = mime_content_type($file);
}
return $type;
}
/**
* Saves the provided error information by finfo_open to this instance
*
* @param integer $errno
* @param string $errstr
* @param string $errfile
* @param integer $errline
* @param array $errcontext
* @return void
*/
protected function _errorHandler($errno, $errstr, $errfile, $errline)
{
$this->_finfoError = new ErrorException($errstr, $errno, 0, $errfile, $errline);
}
}
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