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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) 2005-2015 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) 2005-2015 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 $mimetype MimeType
      * @throws Zend_Validate_Exception
      */
     public function __construct($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 $file
      * @throws Zend_Validate_Exception When finfo can not read the magicfile
      * @return Zend_Validate_File_MimeType Provides a fluent interface
      */
     public function setMagicFile($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 $headerCheck
      * @return Zend_Validate_File_MimeType Provides a fluent interface
      */
     public function enableHeaderCheck($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 $mimetype The mimetypes to add for validation
      * @throws Zend_Validate_Exception
      * @return Zend_Validate_File_Extension Provides a fluent interface
      */
     public function addMimeType($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 $errline
      */
     protected function _errorHandler($errno, $errstr, $errfile, $errline)
     {
         $this->_finfoError = new ErrorException($errstr, $errno, 0, $errfile, $errline);
     }
 }