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68 lars 1 
<?php
2 
/**
3 
 * CodeIgniter
4 
 *
5 
 * An open source application development framework for PHP
6 
 *
7 
 * This content is released under the MIT License (MIT)
8 
 *
2257 lars 9 
 * Copyright (c) 2014 - 2018, British Columbia Institute of Technology
68 lars 10 
 *
11 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 
 * of this software and associated documentation files (the "Software"), to deal
13 
 * in the Software without restriction, including without limitation the rights
14 
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 
 * copies of the Software, and to permit persons to whom the Software is
16 
 * furnished to do so, subject to the following conditions:
17 
 *
18 
 * The above copyright notice and this permission notice shall be included in
19 
 * all copies or substantial portions of the Software.
20 
 *
21 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 
 * THE SOFTWARE.
28 
 *
29 
 * @package	CodeIgniter
30 
 * @author	EllisLab Dev Team
31 
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
2257 lars 32 
 * @copyright	Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
68 lars 33 
 * @license	http://opensource.org/licenses/MIT	MIT License
34 
 * @link	https://codeigniter.com
35 
 * @since	Version 1.0.0
36 
 * @filesource
37 
 */
38 
defined('BASEPATH') OR exit('No direct script access allowed');
39 
 
40 
/**
41 
 * File Uploading Class
42 
 *
43 
 * @package		CodeIgniter
44 
 * @subpackage	Libraries
45 
 * @category	Uploads
46 
 * @author		EllisLab Dev Team
47 
 * @link		https://codeigniter.com/user_guide/libraries/file_uploading.html
48 
 */
49 
class CI_Upload {
50 
 
51 
	/**
52 
	 * Maximum file size
53 
	 *
54 
	 * @var	int
55 
	 */
56 
	public $max_size = 0;
57 
 
58 
	/**
59 
	 * Maximum image width
60 
	 *
61 
	 * @var	int
62 
	 */
63 
	public $max_width = 0;
64 
 
65 
	/**
66 
	 * Maximum image height
67 
	 *
68 
	 * @var	int
69 
	 */
70 
	public $max_height = 0;
71 
 
72 
	/**
73 
	 * Minimum image width
74 
	 *
75 
	 * @var	int
76 
	 */
77 
	public $min_width = 0;
78 
 
79 
	/**
80 
	 * Minimum image height
81 
	 *
82 
	 * @var	int
83 
	 */
84 
	public $min_height = 0;
85 
 
86 
	/**
87 
	 * Maximum filename length
88 
	 *
89 
	 * @var	int
90 
	 */
91 
	public $max_filename = 0;
92 
 
93 
	/**
94 
	 * Maximum duplicate filename increment ID
95 
	 *
96 
	 * @var	int
97 
	 */
98 
	public $max_filename_increment = 100;
99 
 
100 
	/**
101 
	 * Allowed file types
102 
	 *
103 
	 * @var	string
104 
	 */
105 
	public $allowed_types = '';
106 
 
107 
	/**
108 
	 * Temporary filename
109 
	 *
110 
	 * @var	string
111 
	 */
112 
	public $file_temp = '';
113 
 
114 
	/**
115 
	 * Filename
116 
	 *
117 
	 * @var	string
118 
	 */
119 
	public $file_name = '';
120 
 
121 
	/**
122 
	 * Original filename
123 
	 *
124 
	 * @var	string
125 
	 */
126 
	public $orig_name = '';
127 
 
128 
	/**
129 
	 * File type
130 
	 *
131 
	 * @var	string
132 
	 */
133 
	public $file_type = '';
134 
 
135 
	/**
136 
	 * File size
137 
	 *
138 
	 * @var	int
139 
	 */
140 
	public $file_size = NULL;
141 
 
142 
	/**
143 
	 * Filename extension
144 
	 *
145 
	 * @var	string
146 
	 */
147 
	public $file_ext = '';
148 
 
149 
	/**
150 
	 * Force filename extension to lowercase
151 
	 *
152 
	 * @var	string
153 
	 */
154 
	public $file_ext_tolower = FALSE;
155 
 
156 
	/**
157 
	 * Upload path
158 
	 *
159 
	 * @var	string
160 
	 */
161 
	public $upload_path = '';
162 
 
163 
	/**
164 
	 * Overwrite flag
165 
	 *
166 
	 * @var	bool
167 
	 */
168 
	public $overwrite = FALSE;
169 
 
170 
	/**
171 
	 * Obfuscate filename flag
172 
	 *
173 
	 * @var	bool
174 
	 */
175 
	public $encrypt_name = FALSE;
176 
 
177 
	/**
178 
	 * Is image flag
179 
	 *
180 
	 * @var	bool
181 
	 */
182 
	public $is_image = FALSE;
183 
 
184 
	/**
185 
	 * Image width
186 
	 *
187 
	 * @var	int
188 
	 */
189 
	public $image_width = NULL;
190 
 
191 
	/**
192 
	 * Image height
193 
	 *
194 
	 * @var	int
195 
	 */
196 
	public $image_height = NULL;
197 
 
198 
	/**
199 
	 * Image type
200 
	 *
201 
	 * @var	string
202 
	 */
203 
	public $image_type = '';
204 
 
205 
	/**
206 
	 * Image size string
207 
	 *
208 
	 * @var	string
209 
	 */
210 
	public $image_size_str = '';
211 
 
212 
	/**
213 
	 * Error messages list
214 
	 *
215 
	 * @var	array
216 
	 */
217 
	public $error_msg = array();
218 
 
219 
	/**
220 
	 * Remove spaces flag
221 
	 *
222 
	 * @var	bool
223 
	 */
224 
	public $remove_spaces = TRUE;
225 
 
226 
	/**
227 
	 * MIME detection flag
228 
	 *
229 
	 * @var	bool
230 
	 */
231 
	public $detect_mime = TRUE;
232 
 
233 
	/**
234 
	 * XSS filter flag
235 
	 *
236 
	 * @var	bool
237 
	 */
238 
	public $xss_clean = FALSE;
239 
 
240 
	/**
241 
	 * Apache mod_mime fix flag
242 
	 *
243 
	 * @var	bool
244 
	 */
245 
	public $mod_mime_fix = TRUE;
246 
 
247 
	/**
248 
	 * Temporary filename prefix
249 
	 *
250 
	 * @var	string
251 
	 */
252 
	public $temp_prefix = 'temp_file_';
253 
 
254 
	/**
255 
	 * Filename sent by the client
256 
	 *
257 
	 * @var	bool
258 
	 */
259 
	public $client_name = '';
260 
 
261 
	// --------------------------------------------------------------------
262 
 
263 
	/**
264 
	 * Filename override
265 
	 *
266 
	 * @var	string
267 
	 */
268 
	protected $_file_name_override = '';
269 
 
270 
	/**
271 
	 * MIME types list
272 
	 *
273 
	 * @var	array
274 
	 */
275 
	protected $_mimes = array();
276 
 
277 
	/**
278 
	 * CI Singleton
279 
	 *
280 
	 * @var	object
281 
	 */
282 
	protected $_CI;
283 
 
284 
	// --------------------------------------------------------------------
285 
 
286 
	/**
287 
	 * Constructor
288 
	 *
289 
	 * @param	array	$config
290 
	 * @return	void
291 
	 */
292 
	public function __construct($config = array())
293 
	{
294 
		empty($config) OR $this->initialize($config, FALSE);
295 
 
296 
		$this->_mimes =& get_mimes();
297 
		$this->_CI =& get_instance();
298 
 
299 
		log_message('info', 'Upload Class Initialized');
300 
	}
301 
 
302 
	// --------------------------------------------------------------------
303 
 
304 
	/**
305 
	 * Initialize preferences
306 
	 *
307 
	 * @param	array	$config
308 
	 * @param	bool	$reset
309 
	 * @return	CI_Upload
310 
	 */
311 
	public function initialize(array $config = array(), $reset = TRUE)
312 
	{
313 
		$reflection = new ReflectionClass($this);
314 
 
315 
		if ($reset === TRUE)
316 
		{
317 
			$defaults = $reflection->getDefaultProperties();
318 
			foreach (array_keys($defaults) as $key)
319 
			{
320 
				if ($key[0] === '_')
321 
				{
322 
					continue;
323 
				}
324 
 
325 
				if (isset($config[$key]))
326 
				{
327 
					if ($reflection->hasMethod('set_'.$key))
328 
					{
329 
						$this->{'set_'.$key}($config[$key]);
330 
					}
331 
					else
332 
					{
333 
						$this->$key = $config[$key];
334 
					}
335 
				}
336 
				else
337 
				{
338 
					$this->$key = $defaults[$key];
339 
				}
340 
			}
341 
		}
342 
		else
343 
		{
344 
			foreach ($config as $key => &$value)
345 
			{
346 
				if ($key[0] !== '_' && $reflection->hasProperty($key))
347 
				{
348 
					if ($reflection->hasMethod('set_'.$key))
349 
					{
350 
						$this->{'set_'.$key}($value);
351 
					}
352 
					else
353 
					{
354 
						$this->$key = $value;
355 
					}
356 
				}
357 
			}
358 
		}
359 
 
360 
		// if a file_name was provided in the config, use it instead of the user input
361 
		// supplied file name for all uploads until initialized again
362 
		$this->_file_name_override = $this->file_name;
363 
		return $this;
364 
	}
365 
 
366 
	// --------------------------------------------------------------------
367 
 
368 
	/**
369 
	 * Perform the file upload
370 
	 *
371 
	 * @param	string	$field
372 
	 * @return	bool
373 
	 */
374 
	public function do_upload($field = 'userfile')
375 
	{
376 
		// Is $_FILES[$field] set? If not, no reason to continue.
377 
		if (isset($_FILES[$field]))
378 
		{
379 
			$_file = $_FILES[$field];
380 
		}
381 
		// Does the field name contain array notation?
382 
		elseif (($c = preg_match_all('/(?:^[^\[]+)|\[[^]]*\]/', $field, $matches)) > 1)
383 
		{
384 
			$_file = $_FILES;
385 
			for ($i = 0; $i < $c; $i++)
386 
			{
387 
				// We can't track numeric iterations, only full field names are accepted
388 
				if (($field = trim($matches[0][$i], '[]')) === '' OR ! isset($_file[$field]))
389 
				{
390 
					$_file = NULL;
391 
					break;
392 
				}
393 
 
394 
				$_file = $_file[$field];
395 
			}
396 
		}
397 
 
398 
		if ( ! isset($_file))
399 
		{
400 
			$this->set_error('upload_no_file_selected', 'debug');
401 
			return FALSE;
402 
		}
403 
 
404 
		// Is the upload path valid?
405 
		if ( ! $this->validate_upload_path())
406 
		{
407 
			// errors will already be set by validate_upload_path() so just return FALSE
408 
			return FALSE;
409 
		}
410 
 
411 
		// Was the file able to be uploaded? If not, determine the reason why.
412 
		if ( ! is_uploaded_file($_file['tmp_name']))
413 
		{
414 
			$error = isset($_file['error']) ? $_file['error'] : 4;
415 
 
416 
			switch ($error)
417 
			{
418 
				case UPLOAD_ERR_INI_SIZE:
419 
					$this->set_error('upload_file_exceeds_limit', 'info');
420 
					break;
421 
				case UPLOAD_ERR_FORM_SIZE:
422 
					$this->set_error('upload_file_exceeds_form_limit', 'info');
423 
					break;
424 
				case UPLOAD_ERR_PARTIAL:
425 
					$this->set_error('upload_file_partial', 'debug');
426 
					break;
427 
				case UPLOAD_ERR_NO_FILE:
428 
					$this->set_error('upload_no_file_selected', 'debug');
429 
					break;
430 
				case UPLOAD_ERR_NO_TMP_DIR:
431 
					$this->set_error('upload_no_temp_directory', 'error');
432 
					break;
433 
				case UPLOAD_ERR_CANT_WRITE:
434 
					$this->set_error('upload_unable_to_write_file', 'error');
435 
					break;
436 
				case UPLOAD_ERR_EXTENSION:
437 
					$this->set_error('upload_stopped_by_extension', 'debug');
438 
					break;
439 
				default:
440 
					$this->set_error('upload_no_file_selected', 'debug');
441 
					break;
442 
			}
443 
 
444 
			return FALSE;
445 
		}
446 
 
447 
		// Set the uploaded data as class variables
448 
		$this->file_temp = $_file['tmp_name'];
449 
		$this->file_size = $_file['size'];
450 
 
451 
		// Skip MIME type detection?
452 
		if ($this->detect_mime !== FALSE)
453 
		{
454 
			$this->_file_mime_type($_file);
455 
		}
456 
 
457 
		$this->file_type = preg_replace('/^(.+?);.*$/', '\\1', $this->file_type);
458 
		$this->file_type = strtolower(trim(stripslashes($this->file_type), '"'));
459 
		$this->file_name = $this->_prep_filename($_file['name']);
460 
		$this->file_ext	 = $this->get_extension($this->file_name);
461 
		$this->client_name = $this->file_name;
462 
 
463 
		// Is the file type allowed to be uploaded?
464 
		if ( ! $this->is_allowed_filetype())
465 
		{
466 
			$this->set_error('upload_invalid_filetype', 'debug');
467 
			return FALSE;
468 
		}
469 
 
470 
		// if we're overriding, let's now make sure the new name and type is allowed
471 
		if ($this->_file_name_override !== '')
472 
		{
473 
			$this->file_name = $this->_prep_filename($this->_file_name_override);
474 
 
475 
			// If no extension was provided in the file_name config item, use the uploaded one
476 
			if (strpos($this->_file_name_override, '.') === FALSE)
477 
			{
478 
				$this->file_name .= $this->file_ext;
479 
			}
480 
			else
481 
			{
482 
				// An extension was provided, let's have it!
483 
				$this->file_ext	= $this->get_extension($this->_file_name_override);
484 
			}
485 
 
486 
			if ( ! $this->is_allowed_filetype(TRUE))
487 
			{
488 
				$this->set_error('upload_invalid_filetype', 'debug');
489 
				return FALSE;
490 
			}
491 
		}
492 
 
493 
		// Convert the file size to kilobytes
494 
		if ($this->file_size > 0)
495 
		{
496 
			$this->file_size = round($this->file_size/1024, 2);
497 
		}
498 
 
499 
		// Is the file size within the allowed maximum?
500 
		if ( ! $this->is_allowed_filesize())
501 
		{
502 
			$this->set_error('upload_invalid_filesize', 'info');
503 
			return FALSE;
504 
		}
505 
 
506 
		// Are the image dimensions within the allowed size?
507 
		// Note: This can fail if the server has an open_basedir restriction.
508 
		if ( ! $this->is_allowed_dimensions())
509 
		{
510 
			$this->set_error('upload_invalid_dimensions', 'info');
511 
			return FALSE;
512 
		}
513 
 
514 
		// Sanitize the file name for security
515 
		$this->file_name = $this->_CI->security->sanitize_filename($this->file_name);
516 
 
517 
		// Truncate the file name if it's too long
518 
		if ($this->max_filename > 0)
519 
		{
520 
			$this->file_name = $this->limit_filename_length($this->file_name, $this->max_filename);
521 
		}
522 
 
523 
		// Remove white spaces in the name
524 
		if ($this->remove_spaces === TRUE)
525 
		{
526 
			$this->file_name = preg_replace('/\s+/', '_', $this->file_name);
527 
		}
528 
 
529 
		if ($this->file_ext_tolower && ($ext_length = strlen($this->file_ext)))
530 
		{
531 
			// file_ext was previously lower-cased by a get_extension() call
532 
			$this->file_name = substr($this->file_name, 0, -$ext_length).$this->file_ext;
533 
		}
534 
 
535 
		/*
536 
		 * Validate the file name
537 
		 * This function appends an number onto the end of
538 
		 * the file if one with the same name already exists.
539 
		 * If it returns false there was a problem.
540 
		 */
541 
		$this->orig_name = $this->file_name;
542 
		if (FALSE === ($this->file_name = $this->set_filename($this->upload_path, $this->file_name)))
543 
		{
544 
			return FALSE;
545 
		}
546 
 
547 
		/*
548 
		 * Run the file through the XSS hacking filter
549 
		 * This helps prevent malicious code from being
550 
		 * embedded within a file. Scripts can easily
551 
		 * be disguised as images or other file types.
552 
		 */
553 
		if ($this->xss_clean && $this->do_xss_clean() === FALSE)
554 
		{
555 
			$this->set_error('upload_unable_to_write_file', 'error');
556 
			return FALSE;
557 
		}
558 
 
559 
		/*
560 
		 * Move the file to the final destination
561 
		 * To deal with different server configurations
562 
		 * we'll attempt to use copy() first. If that fails
563 
		 * we'll use move_uploaded_file(). One of the two should
564 
		 * reliably work in most environments
565 
		 */
566 
		if ( ! @copy($this->file_temp, $this->upload_path.$this->file_name))
567 
		{
568 
			if ( ! @move_uploaded_file($this->file_temp, $this->upload_path.$this->file_name))
569 
			{
570 
				$this->set_error('upload_destination_error', 'error');
571 
				return FALSE;
572 
			}
573 
		}
574 
 
575 
		/*
576 
		 * Set the finalized image dimensions
577 
		 * This sets the image width/height (assuming the
578 
		 * file was an image). We use this information
579 
		 * in the "data" function.
580 
		 */
581 
		$this->set_image_properties($this->upload_path.$this->file_name);
582 
 
583 
		return TRUE;
584 
	}
585 
 
586 
	// --------------------------------------------------------------------
587 
 
588 
	/**
589 
	 * Finalized Data Array
590 
	 *
591 
	 * Returns an associative array containing all of the information
592 
	 * related to the upload, allowing the developer easy access in one array.
593 
	 *
594 
	 * @param	string	$index
595 
	 * @return	mixed
596 
	 */
597 
	public function data($index = NULL)
598 
	{
599 
		$data = array(
600 
				'file_name'		=> $this->file_name,
601 
				'file_type'		=> $this->file_type,
602 
				'file_path'		=> $this->upload_path,
603 
				'full_path'		=> $this->upload_path.$this->file_name,
604 
				'raw_name'		=> substr($this->file_name, 0, -strlen($this->file_ext)),
605 
				'orig_name'		=> $this->orig_name,
606 
				'client_name'		=> $this->client_name,
607 
				'file_ext'		=> $this->file_ext,
608 
				'file_size'		=> $this->file_size,
609 
				'is_image'		=> $this->is_image(),
610 
				'image_width'		=> $this->image_width,
611 
				'image_height'		=> $this->image_height,
612 
				'image_type'		=> $this->image_type,
613 
				'image_size_str'	=> $this->image_size_str,
614 
			);
615 
 
616 
		if ( ! empty($index))
617 
		{
618 
			return isset($data[$index]) ? $data[$index] : NULL;
619 
		}
620 
 
621 
		return $data;
622 
	}
623 
 
624 
	// --------------------------------------------------------------------
625 
 
626 
	/**
627 
	 * Set Upload Path
628 
	 *
629 
	 * @param	string	$path
630 
	 * @return	CI_Upload
631 
	 */
632 
	public function set_upload_path($path)
633 
	{
634 
		// Make sure it has a trailing slash
635 
		$this->upload_path = rtrim($path, '/').'/';
636 
		return $this;
637 
	}
638 
 
639 
	// --------------------------------------------------------------------
640 
 
641 
	/**
642 
	 * Set the file name
643 
	 *
644 
	 * This function takes a filename/path as input and looks for the
645 
	 * existence of a file with the same name. If found, it will append a
646 
	 * number to the end of the filename to avoid overwriting a pre-existing file.
647 
	 *
648 
	 * @param	string	$path
649 
	 * @param	string	$filename
650 
	 * @return	string
651 
	 */
652 
	public function set_filename($path, $filename)
653 
	{
654 
		if ($this->encrypt_name === TRUE)
655 
		{
656 
			$filename = md5(uniqid(mt_rand())).$this->file_ext;
657 
		}
658 
 
659 
		if ($this->overwrite === TRUE OR ! file_exists($path.$filename))
660 
		{
661 
			return $filename;
662 
		}
663 
 
664 
		$filename = str_replace($this->file_ext, '', $filename);
665 
 
666 
		$new_filename = '';
667 
		for ($i = 1; $i < $this->max_filename_increment; $i++)
668 
		{
669 
			if ( ! file_exists($path.$filename.$i.$this->file_ext))
670 
			{
671 
				$new_filename = $filename.$i.$this->file_ext;
672 
				break;
673 
			}
674 
		}
675 
 
676 
		if ($new_filename === '')
677 
		{
678 
			$this->set_error('upload_bad_filename', 'debug');
679 
			return FALSE;
680 
		}
2257 lars 681 
 
682 
		return $new_filename;
68 lars 683 
	}
684 
 
685 
	// --------------------------------------------------------------------
686 
 
687 
	/**
688 
	 * Set Maximum File Size
689 
	 *
690 
	 * @param	int	$n
691 
	 * @return	CI_Upload
692 
	 */
693 
	public function set_max_filesize($n)
694 
	{
695 
		$this->max_size = ($n < 0) ? 0 : (int) $n;
696 
		return $this;
697 
	}
698 
 
699 
	// --------------------------------------------------------------------
700 
 
701 
	/**
702 
	 * Set Maximum File Size
703 
	 *
704 
	 * An internal alias to set_max_filesize() to help with configuration
705 
	 * as initialize() will look for a set_<property_name>() method ...
706 
	 *
707 
	 * @param	int	$n
708 
	 * @return	CI_Upload
709 
	 */
710 
	protected function set_max_size($n)
711 
	{
712 
		return $this->set_max_filesize($n);
713 
	}
714 
 
715 
	// --------------------------------------------------------------------
716 
 
717 
	/**
718 
	 * Set Maximum File Name Length
719 
	 *
720 
	 * @param	int	$n
721 
	 * @return	CI_Upload
722 
	 */
723 
	public function set_max_filename($n)
724 
	{
725 
		$this->max_filename = ($n < 0) ? 0 : (int) $n;
726 
		return $this;
727 
	}
728 
 
729 
	// --------------------------------------------------------------------
730 
 
731 
	/**
732 
	 * Set Maximum Image Width
733 
	 *
734 
	 * @param	int	$n
735 
	 * @return	CI_Upload
736 
	 */
737 
	public function set_max_width($n)
738 
	{
739 
		$this->max_width = ($n < 0) ? 0 : (int) $n;
740 
		return $this;
741 
	}
742 
 
743 
	// --------------------------------------------------------------------
744 
 
745 
	/**
746 
	 * Set Maximum Image Height
747 
	 *
748 
	 * @param	int	$n
749 
	 * @return	CI_Upload
750 
	 */
751 
	public function set_max_height($n)
752 
	{
753 
		$this->max_height = ($n < 0) ? 0 : (int) $n;
754 
		return $this;
755 
	}
756 
 
757 
	// --------------------------------------------------------------------
758 
 
759 
	/**
760 
	 * Set minimum image width
761 
	 *
762 
	 * @param	int	$n
763 
	 * @return	CI_Upload
764 
	 */
765 
	public function set_min_width($n)
766 
	{
767 
		$this->min_width = ($n < 0) ? 0 : (int) $n;
768 
		return $this;
769 
	}
770 
 
771 
	// --------------------------------------------------------------------
772 
 
773 
	/**
774 
	 * Set minimum image height
775 
	 *
776 
	 * @param	int	$n
777 
	 * @return	CI_Upload
778 
	 */
779 
	public function set_min_height($n)
780 
	{
781 
		$this->min_height = ($n < 0) ? 0 : (int) $n;
782 
		return $this;
783 
	}
784 
 
785 
	// --------------------------------------------------------------------
786 
 
787 
	/**
788 
	 * Set Allowed File Types
789 
	 *
790 
	 * @param	mixed	$types
791 
	 * @return	CI_Upload
792 
	 */
793 
	public function set_allowed_types($types)
794 
	{
795 
		$this->allowed_types = (is_array($types) OR $types === '*')
796 
			? $types
797 
			: explode('|', $types);
798 
		return $this;
799 
	}
800 
 
801 
	// --------------------------------------------------------------------
802 
 
803 
	/**
804 
	 * Set Image Properties
805 
	 *
806 
	 * Uses GD to determine the width/height/type of image
807 
	 *
808 
	 * @param	string	$path
809 
	 * @return	CI_Upload
810 
	 */
811 
	public function set_image_properties($path = '')
812 
	{
813 
		if ($this->is_image() && function_exists('getimagesize'))
814 
		{
815 
			if (FALSE !== ($D = @getimagesize($path)))
816 
			{
817 
				$types = array(1 => 'gif', 2 => 'jpeg', 3 => 'png');
818 
 
819 
				$this->image_width	= $D[0];
820 
				$this->image_height	= $D[1];
821 
				$this->image_type	= isset($types[$D[2]]) ? $types[$D[2]] : 'unknown';
822 
				$this->image_size_str	= $D[3]; // string containing height and width
823 
			}
824 
		}
825 
 
826 
		return $this;
827 
	}
828 
 
829 
	// --------------------------------------------------------------------
830 
 
831 
	/**
832 
	 * Set XSS Clean
833 
	 *
834 
	 * Enables the XSS flag so that the file that was uploaded
835 
	 * will be run through the XSS filter.
836 
	 *
837 
	 * @param	bool	$flag
838 
	 * @return	CI_Upload
839 
	 */
840 
	public function set_xss_clean($flag = FALSE)
841 
	{
842 
		$this->xss_clean = ($flag === TRUE);
843 
		return $this;
844 
	}
845 
 
846 
	// --------------------------------------------------------------------
847 
 
848 
	/**
849 
	 * Validate the image
850 
	 *
851 
	 * @return	bool
852 
	 */
853 
	public function is_image()
854 
	{
855 
		// IE will sometimes return odd mime-types during upload, so here we just standardize all
856 
		// jpegs or pngs to the same file type.
857 
 
858 
		$png_mimes  = array('image/x-png');
859 
		$jpeg_mimes = array('image/jpg', 'image/jpe', 'image/jpeg', 'image/pjpeg');
860 
 
861 
		if (in_array($this->file_type, $png_mimes))
862 
		{
863 
			$this->file_type = 'image/png';
864 
		}
865 
		elseif (in_array($this->file_type, $jpeg_mimes))
866 
		{
867 
			$this->file_type = 'image/jpeg';
868 
		}
869 
 
870 
		$img_mimes = array('image/gif',	'image/jpeg', 'image/png');
871 
 
872 
		return in_array($this->file_type, $img_mimes, TRUE);
873 
	}
874 
 
875 
	// --------------------------------------------------------------------
876 
 
877 
	/**
878 
	 * Verify that the filetype is allowed
879 
	 *
880 
	 * @param	bool	$ignore_mime
881 
	 * @return	bool
882 
	 */
883 
	public function is_allowed_filetype($ignore_mime = FALSE)
884 
	{
885 
		if ($this->allowed_types === '*')
886 
		{
887 
			return TRUE;
888 
		}
889 
 
890 
		if (empty($this->allowed_types) OR ! is_array($this->allowed_types))
891 
		{
892 
			$this->set_error('upload_no_file_types', 'debug');
893 
			return FALSE;
894 
		}
895 
 
896 
		$ext = strtolower(ltrim($this->file_ext, '.'));
897 
 
898 
		if ( ! in_array($ext, $this->allowed_types, TRUE))
899 
		{
900 
			return FALSE;
901 
		}
902 
 
903 
		// Images get some additional checks
904 
		if (in_array($ext, array('gif', 'jpg', 'jpeg', 'jpe', 'png'), TRUE) && @getimagesize($this->file_temp) === FALSE)
905 
		{
906 
			return FALSE;
907 
		}
908 
 
909 
		if ($ignore_mime === TRUE)
910 
		{
911 
			return TRUE;
912 
		}
913 
 
914 
		if (isset($this->_mimes[$ext]))
915 
		{
916 
			return is_array($this->_mimes[$ext])
917 
				? in_array($this->file_type, $this->_mimes[$ext], TRUE)
918 
				: ($this->_mimes[$ext] === $this->file_type);
919 
		}
920 
 
921 
		return FALSE;
922 
	}
923 
 
924 
	// --------------------------------------------------------------------
925 
 
926 
	/**
927 
	 * Verify that the file is within the allowed size
928 
	 *
929 
	 * @return	bool
930 
	 */
931 
	public function is_allowed_filesize()
932 
	{
933 
		return ($this->max_size === 0 OR $this->max_size > $this->file_size);
934 
	}
935 
 
936 
	// --------------------------------------------------------------------
937 
 
938 
	/**
939 
	 * Verify that the image is within the allowed width/height
940 
	 *
941 
	 * @return	bool
942 
	 */
943 
	public function is_allowed_dimensions()
944 
	{
945 
		if ( ! $this->is_image())
946 
		{
947 
			return TRUE;
948 
		}
949 
 
950 
		if (function_exists('getimagesize'))
951 
		{
952 
			$D = @getimagesize($this->file_temp);
953 
 
954 
			if ($this->max_width > 0 && $D[0] > $this->max_width)
955 
			{
956 
				return FALSE;
957 
			}
958 
 
959 
			if ($this->max_height > 0 && $D[1] > $this->max_height)
960 
			{
961 
				return FALSE;
962 
			}
963 
 
964 
			if ($this->min_width > 0 && $D[0] < $this->min_width)
965 
			{
966 
				return FALSE;
967 
			}
968 
 
969 
			if ($this->min_height > 0 && $D[1] < $this->min_height)
970 
			{
971 
				return FALSE;
972 
			}
973 
		}
974 
 
975 
		return TRUE;
976 
	}
977 
 
978 
	// --------------------------------------------------------------------
979 
 
980 
	/**
981 
	 * Validate Upload Path
982 
	 *
983 
	 * Verifies that it is a valid upload path with proper permissions.
984 
	 *
985 
	 * @return	bool
986 
	 */
987 
	public function validate_upload_path()
988 
	{
989 
		if ($this->upload_path === '')
990 
		{
991 
			$this->set_error('upload_no_filepath', 'error');
992 
			return FALSE;
993 
		}
994 
 
995 
		if (realpath($this->upload_path) !== FALSE)
996 
		{
997 
			$this->upload_path = str_replace('\\', '/', realpath($this->upload_path));
998 
		}
999 
 
1000 
		if ( ! is_dir($this->upload_path))
1001 
		{
1002 
			$this->set_error('upload_no_filepath', 'error');
1003 
			return FALSE;
1004 
		}
1005 
 
1006 
		if ( ! is_really_writable($this->upload_path))
1007 
		{
1008 
			$this->set_error('upload_not_writable', 'error');
1009 
			return FALSE;
1010 
		}
1011 
 
1012 
		$this->upload_path = preg_replace('/(.+?)\/*$/', '\\1/',  $this->upload_path);
1013 
		return TRUE;
1014 
	}
1015 
 
1016 
	// --------------------------------------------------------------------
1017 
 
1018 
	/**
1019 
	 * Extract the file extension
1020 
	 *
1021 
	 * @param	string	$filename
1022 
	 * @return	string
1023 
	 */
1024 
	public function get_extension($filename)
1025 
	{
1026 
		$x = explode('.', $filename);
1027 
 
1028 
		if (count($x) === 1)
1029 
		{
1030 
			return '';
1031 
		}
1032 
 
1033 
		$ext = ($this->file_ext_tolower) ? strtolower(end($x)) : end($x);
1034 
		return '.'.$ext;
1035 
	}
1036 
 
1037 
	// --------------------------------------------------------------------
1038 
 
1039 
	/**
1040 
	 * Limit the File Name Length
1041 
	 *
1042 
	 * @param	string	$filename
1043 
	 * @param	int	$length
1044 
	 * @return	string
1045 
	 */
1046 
	public function limit_filename_length($filename, $length)
1047 
	{
1048 
		if (strlen($filename) < $length)
1049 
		{
1050 
			return $filename;
1051 
		}
1052 
 
1053 
		$ext = '';
1054 
		if (strpos($filename, '.') !== FALSE)
1055 
		{
1056 
			$parts		= explode('.', $filename);
1057 
			$ext		= '.'.array_pop($parts);
1058 
			$filename	= implode('.', $parts);
1059 
		}
1060 
 
1061 
		return substr($filename, 0, ($length - strlen($ext))).$ext;
1062 
	}
1063 
 
1064 
	// --------------------------------------------------------------------
1065 
 
1066 
	/**
1067 
	 * Runs the file through the XSS clean function
1068 
	 *
1069 
	 * This prevents people from embedding malicious code in their files.
1070 
	 * I'm not sure that it won't negatively affect certain files in unexpected ways,
1071 
	 * but so far I haven't found that it causes trouble.
1072 
	 *
1073 
	 * @return	string
1074 
	 */
1075 
	public function do_xss_clean()
1076 
	{
1077 
		$file = $this->file_temp;
1078 
 
1079 
		if (filesize($file) == 0)
1080 
		{
1081 
			return FALSE;
1082 
		}
1083 
 
1257 lars 1084 
		if (memory_get_usage() && ($memory_limit = ini_get('memory_limit')) > 0)
68 lars 1085 
		{
1257 lars 1086 
			$memory_limit = str_split($memory_limit, strspn($memory_limit, '1234567890'));
1087 
			if ( ! empty($memory_limit[1]))
1088 
			{
1089 
				switch ($memory_limit[1][0])
1090 
				{
1091 
					case 'g':
1092 
					case 'G':
1093 
						$memory_limit[0] *= 1024 * 1024 * 1024;
1094 
						break;
1095 
					case 'm':
1096 
					case 'M':
1097 
						$memory_limit[0] *= 1024 * 1024;
1098 
						break;
1099 
					default:
1100 
						break;
1101 
				}
1102 
			}
68 lars 1103 
 
1257 lars 1104 
			$memory_limit = (int) ceil(filesize($file) + $memory_limit[0]);
68 lars 1105 
			ini_set('memory_limit', $memory_limit); // When an integer is used, the value is measured in bytes. - PHP.net
1106 
		}
1107 
 
1108 
		// If the file being uploaded is an image, then we should have no problem with XSS attacks (in theory), but
1109 
		// IE can be fooled into mime-type detecting a malformed image as an html file, thus executing an XSS attack on anyone
1110 
		// using IE who looks at the image. It does this by inspecting the first 255 bytes of an image. To get around this
1111 
		// CI will itself look at the first 255 bytes of an image to determine its relative safety. This can save a lot of
1112 
		// processor power and time if it is actually a clean image, as it will be in nearly all instances _except_ an
1113 
		// attempted XSS attack.
1114 
 
1115 
		if (function_exists('getimagesize') && @getimagesize($file) !== FALSE)
1116 
		{
1117 
			if (($file = @fopen($file, 'rb')) === FALSE) // "b" to force binary
1118 
			{
1119 
				return FALSE; // Couldn't open the file, return FALSE
1120 
			}
1121 
 
1122 
			$opening_bytes = fread($file, 256);
1123 
			fclose($file);
1124 
 
1125 
			// These are known to throw IE into mime-type detection chaos
1126 
			// <a, <body, <head, <html, <img, <plaintext, <pre, <script, <table, <title
1127 
			// title is basically just in SVG, but we filter it anyhow
1128 
 
1129 
			// if it's an image or no "triggers" detected in the first 256 bytes - we're good
1130 
			return ! preg_match('/<(a|body|head|html|img|plaintext|pre|script|table|title)[\s>]/i', $opening_bytes);
1131 
		}
1132 
 
1133 
		if (($data = @file_get_contents($file)) === FALSE)
1134 
		{
1135 
			return FALSE;
1136 
		}
1137 
 
1138 
		return $this->_CI->security->xss_clean($data, TRUE);
1139 
	}
1140 
 
1141 
	// --------------------------------------------------------------------
1142 
 
1143 
	/**
1144 
	 * Set an error message
1145 
	 *
1146 
	 * @param	string	$msg
1147 
	 * @return	CI_Upload
1148 
	 */
1149 
	public function set_error($msg, $log_level = 'error')
1150 
	{
1151 
		$this->_CI->lang->load('upload');
1152 
 
1153 
		is_array($msg) OR $msg = array($msg);
1154 
		foreach ($msg as $val)
1155 
		{
1156 
			$msg = ($this->_CI->lang->line($val) === FALSE) ? $val : $this->_CI->lang->line($val);
1157 
			$this->error_msg[] = $msg;
1158 
			log_message($log_level, $msg);
1159 
		}
1160 
 
1161 
		return $this;
1162 
	}
1163 
 
1164 
	// --------------------------------------------------------------------
1165 
 
1166 
	/**
1167 
	 * Display the error message
1168 
	 *
1169 
	 * @param	string	$open
1170 
	 * @param	string	$close
1171 
	 * @return	string
1172 
	 */
1173 
	public function display_errors($open = '<p>', $close = '</p>')
1174 
	{
1175 
		return (count($this->error_msg) > 0) ? $open.implode($close.$open, $this->error_msg).$close : '';
1176 
	}
1177 
 
1178 
	// --------------------------------------------------------------------
1179 
 
1180 
	/**
1181 
	 * Prep Filename
1182 
	 *
1183 
	 * Prevents possible script execution from Apache's handling
1184 
	 * of files' multiple extensions.
1185 
	 *
1186 
	 * @link	http://httpd.apache.org/docs/1.3/mod/mod_mime.html#multipleext
1187 
	 *
1188 
	 * @param	string	$filename
1189 
	 * @return	string
1190 
	 */
1191 
	protected function _prep_filename($filename)
1192 
	{
1193 
		if ($this->mod_mime_fix === FALSE OR $this->allowed_types === '*' OR ($ext_pos = strrpos($filename, '.')) === FALSE)
1194 
		{
1195 
			return $filename;
1196 
		}
1197 
 
1198 
		$ext = substr($filename, $ext_pos);
1199 
		$filename = substr($filename, 0, $ext_pos);
1200 
		return str_replace('.', '_', $filename).$ext;
1201 
	}
1202 
 
1203 
	// --------------------------------------------------------------------
1204 
 
1205 
	/**
1206 
	 * File MIME type
1207 
	 *
1208 
	 * Detects the (actual) MIME type of the uploaded file, if possible.
1209 
	 * The input array is expected to be $_FILES[$field]
1210 
	 *
1211 
	 * @param	array	$file
1212 
	 * @return	void
1213 
	 */
1214 
	protected function _file_mime_type($file)
1215 
	{
1216 
		// We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii)
1217 
		$regexp = '/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s.+)?$/';
1218 
 
2049 lars 1219 
		/**
1220 
		 * Fileinfo extension - most reliable method
1221 
		 *
1222 
		 * Apparently XAMPP, CentOS, cPanel and who knows what
1223 
		 * other PHP distribution channels EXPLICITLY DISABLE
1224 
		 * ext/fileinfo, which is otherwise enabled by default
1225 
		 * since PHP 5.3 ...
1226 
		 */
1227 
		if (function_exists('finfo_file'))
68 lars 1228 
		{
2049 lars 1229 
			$finfo = @finfo_open(FILEINFO_MIME);
1230 
			if (is_resource($finfo)) // It is possible that a FALSE value is returned, if there is no magic MIME database file found on the system
1231 
			{
1232 
				$mime = @finfo_file($finfo, $file['tmp_name']);
1233 
				finfo_close($finfo);
1257 lars 1234 
 
2049 lars 1235 
				/* According to the comments section of the PHP manual page,
1236 
				 * it is possible that this function returns an empty string
1237 
				 * for some files (e.g. if they don't exist in the magic MIME database)
1238 
				 */
1239 
				if (is_string($mime) && preg_match($regexp, $mime, $matches))
1240 
				{
1241 
					$this->file_type = $matches[1];
1242 
					return;
1243 
				}
68 lars 1244 
			}
1245 
		}
1246 
 
1247 
		/* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,
1248 
		 * which is still more secure than depending on the value of $_FILES[$field]['type'], and as it
1249 
		 * was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better
1250 
		 * than mime_content_type() as well, hence the attempts to try calling the command line with
1251 
		 * three different functions.
1252 
		 *
1253 
		 * Notes:
1254 
		 *	- the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system
1255 
		 *	- many system admins would disable the exec(), shell_exec(), popen() and similar functions
1256 
		 *	  due to security concerns, hence the function_usable() checks
1257 
		 */
1258 
		if (DIRECTORY_SEPARATOR !== '\\')
1259 
		{
1260 
			$cmd = function_exists('escapeshellarg')
1261 
				? 'file --brief --mime '.escapeshellarg($file['tmp_name']).' 2>&1'
1262 
				: 'file --brief --mime '.$file['tmp_name'].' 2>&1';
1263 
 
1264 
			if (function_usable('exec'))
1265 
			{
1266 
				/* This might look confusing, as $mime is being populated with all of the output when set in the second parameter.
1267 
				 * However, we only need the last line, which is the actual return value of exec(), and as such - it overwrites
1268 
				 * anything that could already be set for $mime previously. This effectively makes the second parameter a dummy
1269 
				 * value, which is only put to allow us to get the return status code.
1270 
				 */
1271 
				$mime = @exec($cmd, $mime, $return_status);
1272 
				if ($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches))
1273 
				{
1274 
					$this->file_type = $matches[1];
1275 
					return;
1276 
				}
1277 
			}
1278 
 
1279 
			if ( ! ini_get('safe_mode') && function_usable('shell_exec'))
1280 
			{
1281 
				$mime = @shell_exec($cmd);
1282 
				if (strlen($mime) > 0)
1283 
				{
1284 
					$mime = explode("\n", trim($mime));
1285 
					if (preg_match($regexp, $mime[(count($mime) - 1)], $matches))
1286 
					{
1287 
						$this->file_type = $matches[1];
1288 
						return;
1289 
					}
1290 
				}
1291 
			}
1292 
 
1293 
			if (function_usable('popen'))
1294 
			{
1295 
				$proc = @popen($cmd, 'r');
1296 
				if (is_resource($proc))
1297 
				{
1298 
					$mime = @fread($proc, 512);
1299 
					@pclose($proc);
1300 
					if ($mime !== FALSE)
1301 
					{
1302 
						$mime = explode("\n", trim($mime));
1303 
						if (preg_match($regexp, $mime[(count($mime) - 1)], $matches))
1304 
						{
1305 
							$this->file_type = $matches[1];
1306 
							return;
1307 
						}
1308 
					}
1309 
				}
1310 
			}
1311 
		}
1312 
 
2107 lars 1313 
		// Fall back to mime_content_type(), if available (still better than $_FILES[$field]['type'])
68 lars 1314 
		if (function_exists('mime_content_type'))
1315 
		{
1316 
			$this->file_type = @mime_content_type($file['tmp_name']);
1317 
			if (strlen($this->file_type) > 0) // It's possible that mime_content_type() returns FALSE or an empty string
1318 
			{
1319 
				return;
1320 
			}
1321 
		}
1322 
 
1323 
		$this->file_type = $file['type'];
1324 
	}
1325 
 
1326 
}