<?php
/*
    TimThumb script created by Tim McDaniels and Darren Hoyt with tweaks by Ben Gillbanks
    http://code.google.com/p/timthumb/

    MIT License: http://www.opensource.org/licenses/mit-license.php

    Paramters
    ---------
    w: width
    h: height
    zc: zoom crop (0 or 1)
    q: quality (default is 75 and max is 100)

    HTML example: <img src="/scripts/timthumb.php?src=/images/whatever.jpg&w=150&h=200&zc=1" alt="" />
*/

/*
$sizeLimits = array(
    "100x100",
    "150x150",
);
*/

error_reporting(0);
ini_set("display_errors", 1);

define ('CACHE_SIZE', 250);					// number of files to store before clearing cache
define ('CACHE_CLEAR', 5);					// maximum number of files to delete on each cache clear
define ('CACHE_USE', FALSE);				// use the cache files? (mostly for testing)
define ('VERSION', '1.15');					// version number (to force a cache refresh)
define ('DIRECTORY_CACHE', './cache');		// cache directory
define ('DIRECTORY_TEMP', './temp');		// temp directory

// 	external domains that are allowed to be displayed on your website
$allowedSites = array (
	'flickr.com',
	'picasa.com',
	'blogger.com',
	'wordpress.com',
	'img.youtube.com',
);


// STOP MODIFYING HERE!
// --------------------

// check to see if GD function exist
if (!function_exists('imagecreatetruecolor')) {
    displayError('GD Library Error: imagecreatetruecolor does not exist - please contact your webhost and ask them to install the GD library');
}

if (function_exists ('imagefilter') && defined ('IMG_FILTER_NEGATE')) {
	$imageFilters = array (
		1 => array (IMG_FILTER_NEGATE, 0),
		2 => array (IMG_FILTER_GRAYSCALE, 0),
		3 => array (IMG_FILTER_BRIGHTNESS, 1),
		4 => array (IMG_FILTER_CONTRAST, 1),
		5 => array (IMG_FILTER_COLORIZE, 4),
		6 => array (IMG_FILTER_EDGEDETECT, 0),
		7 => array (IMG_FILTER_EMBOSS, 0),
		8 => array (IMG_FILTER_GAUSSIAN_BLUR, 0),
		9 => array (IMG_FILTER_SELECTIVE_BLUR, 0),
		10 => array (IMG_FILTER_MEAN_REMOVAL, 0),
		11 => array (IMG_FILTER_SMOOTH, 0),
	);
}

// sort out image source
$src = get_request ('src', '');
if ($src == '' || strlen ($src) <= 3) {
    displayError ('no image specified');
}

// clean params before use
$src = cleanSource ($src);
// last modified time (for caching)
$lastModified = filemtime ($src);

// get standard input properties
$new_width = preg_replace ("/[^0-9]+/", '', get_request('w', 0));
$new_height = preg_replace ("/[^0-9]+/", '', get_request('h', 0));
$zoom_crop = preg_replace ("/[^0-9]+/", '', get_request('zc', 1));
$quality = preg_replace ("/[^0-9]+/", '', get_request('q', 90));
$align = get_request ('a', 'c');
$filters = get_request ('f', '');
$sharpen = get_request ('s', 0);

// set default width and height if neither are set already
if ($new_width == 0 && $new_height == 0) {
    $new_width = 100;
    $new_height = 100;
}

// get mime type of src
$mime_type = mime_type ($src);

// check to see if this image is in the cache already
check_cache ($mime_type);

// if not in cache then clear some space and generate a new file
cleanCache();

// set memory limit to be able to have enough space to resize larger images
ini_set ('memory_limit', '50M');

// make sure that the src is gif/jpg/png
if (!valid_src_mime_type ($mime_type)) {
    displayError ('Invalid src mime type: ' . $mime_type);
}

if (strlen ($src) && file_exists ($src)) {

    // open the existing image
    $image = open_image ($mime_type, $src);
    if ($image === false) {
        displayError ('Unable to open image : ' . $src);
    }

    // Get original width and height
    $width = imagesx ($image);
    $height = imagesy ($image);

    // generate new w/h if not provided
    if ($new_width && !$new_height) {

        $new_height = $height * ($new_width / $width);

    } elseif ($new_height && !$new_width) {

        $new_width = $width * ($new_height / $height);

    } elseif (!$new_width && !$new_height) {

        $new_width = $width;
        $new_height = $height;

    }

    // create a new true color image
    $canvas = imagecreatetruecolor ($new_width, $new_height);
    imagealphablending ($canvas, false);
    // Create a new transparent color for image
    $color = imagecolorallocatealpha ($canvas, 0, 0, 0, 127);
    // Completely fill the background of the new image with allocated color.
    imagefill ($canvas, 0, 0, $color);
    // Restore transparency blending
    imagesavealpha ($canvas, true);

    if ($zoom_crop) {

        $src_x = $src_y = 0;
        $src_w = $width;
        $src_h = $height;

        $cmp_x = $width  / $new_width;
        $cmp_y = $height / $new_height;

        // calculate x or y coordinate and width or height of source
		if ($cmp_x > $cmp_y) {

            $src_w = round (($width / $cmp_x * $cmp_y));
            $src_x = round (($width - ($width / $cmp_x * $cmp_y)) / 2);

        } elseif ($cmp_y > $cmp_x) {

            $src_h = round (($height / $cmp_y * $cmp_x));
            $src_y = round (($height - ($height / $cmp_y * $cmp_x)) / 2);

        }

		// positional cropping!
		switch ($align) {
			case 't':
			case 'tl':
			case 'lr':
			case 'tr':
			case 'rt':
				$src_y = 0;
				break;

			case 'b':
			case 'bl':
			case 'lb':
			case 'br':
			case 'rb':
				$src_y = $height - $src_h;
				break;

			case 'l':
			case 'tl':
			case 'lt':
			case 'bl':
			case 'lb':
				$src_x = 0;
				break;

			case 'r':
			case 'tr':
			case 'rt':
			case 'br':
			case 'rb':
				$src_x = $width - $new_width;
				$src_x = $width - $src_w;

				break;

			default:

				break;
		}

		imagecopyresampled ($canvas, $image, 0, 0, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h);

    } else {

        // copy and resize part of an image with resampling
        imagecopyresampled ($canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

    }

    if ($filters != '' && function_exists ('imagefilter') && defined ('IMG_FILTER_NEGATE')) {
        // apply filters to image
        $filterList = explode ('|', $filters);
        foreach ($filterList as $fl) {

            $filterSettings = explode (',', $fl);
            if (isset ($imageFilters[$filterSettings[0]])) {

                for ($i = 0; $i < 4; $i ++) {
                    if (!isset ($filterSettings[$i])) {
						$filterSettings[$i] = null;
                    } else {
						$filterSettings[$i] = (int) $filterSettings[$i];
					}
                }

                switch ($imageFilters[$filterSettings[0]][1]) {

                    case 1:

                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1]);
                        break;

                    case 2:

                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2]);
                        break;

                    case 3:

                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3]);
                        break;

                    case 4:

                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3], $filterSettings[4]);
                        break;

                    default:

                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0]);
                        break;

                }
            }
        }
    }

	if ($sharpen > 0 && function_exists('imageconvolution')) {

		$sharpenMatrix = array(
			array(-1,-1,-1),
			array(-1,16,-1),
			array(-1,-1,-1),
		);

		$divisor = 8;
		$offset = 0;

		imageconvolution ($canvas, $sharpenMatrix, $divisor, $offset);

	}

    // output image to browser based on mime type
    show_image ($mime_type, $canvas);

    // remove image from memory
    imagedestroy ($canvas);

} else {

    if (strlen ($src)) {
        displayError ('image ' . $src . ' not found');
    } else {
        displayError ('no source specified');
    }

}

/**
 *
 */
function show_image ($mime_type, $image_resized) {

    global $quality;

    // check to see if we can write to the cache directory
    $is_writable = 0;
    $cache_file = get_cache_file ($mime_type);

    if (touch ($cache_file)) {

        // give 666 permissions so that the developer
        // can overwrite web server user
        chmod ($cache_file, 0666);
        $is_writable = 1;

    } else {

        $cache_file = NULL;
        header ('Content-type: ' . $mime_type);

    }

	if (stristr ($mime_type, 'jpeg')) {
		imagejpeg ($image_resized, $cache_file, $quality);
	} else {
		$quality = floor ($quality * 0.09);
		imagepng ($image_resized, $cache_file, $quality);
    }

    if ($is_writable) {
        show_cache_file ($mime_type);
    }

    imagedestroy ($image_resized);

    //displayError ('error showing image');

}

/**
 *
 */
function get_request( $property, $default = 0 ) {

    if( isset($_REQUEST[$property]) ) {

        return $_REQUEST[$property];

    } else {

        return $default;

    }

}

/**
 *
 */
function open_image ($mime_type, $src) {

	$mime_type = strtolower ($mime_type);

	if (stristr ($mime_type, 'gif')) {

        $image = imagecreatefromgif($src);

    } elseif (stristr ($mime_type, 'jpeg')) {

        @ini_set ('gd.jpeg_ignore_warning', 1);
        $image = imagecreatefromjpeg($src);

    } elseif (stristr ($mime_type, 'png')) {

        $image = imagecreatefrompng($src);

    }

    return $image;

}

/**
 * clean out old files from the cache
 * you can change the number of files to store and to delete per loop in the defines at the top of the code
 */
function cleanCache() {

    $files = glob(DIRECTORY_CACHE . '/*', GLOB_BRACE);

    if (count($files) > 0) {

        $yesterday = time() - (24 * 60 * 60);

        usort($files, 'filemtime_compare');
        $i = 0;

        if (count($files) > CACHE_SIZE) {

            foreach ($files as $file) {

                $i ++;

                if ($i >= CACHE_CLEAR) {
                    return;
                }

                if (@filemtime($file) > $yesterday) {
                    return;
                }

				if (file_exists($file)) {
					unlink($file);
				}

            }

        }

    }

}


/**
 * compare the file time of two files
 */
function filemtime_compare($a, $b) {

    return filemtime ($a) - filemtime ($b);

}


/**
 * determine the file mime type
 */
function mime_type ($file) {

    if (stristr (PHP_OS, 'WIN')) {
        $os = 'WIN';
    } else {
        $os = PHP_OS;
    }

    $mime_type = '';

    if (function_exists ('mime_content_type') && $os != 'WIN') {
        $mime_type = mime_content_type ($file);
    }

	// use PECL fileinfo to determine mime type
	if (!valid_src_mime_type ($mime_type)) {
		if (function_exists ('finfo_open')) {
			$finfo = @finfo_open (FILEINFO_MIME);
			if ($finfo != '') {
				$mime_type = finfo_file ($finfo, $file);
				finfo_close ($finfo);
			}
		}
	}

    // try to determine mime type by using unix file command
    // this should not be executed on windows
    if (!valid_src_mime_type ($mime_type) && $os != "WIN") {
        if (preg_match ("/FreeBSD|FREEBSD|LINUX/", $os)) {
			$mime_type = trim (@shell_exec ('file -bi ' . escapeshellarg($file)));
        }
    }

    // use file's extension to determine mime type
    if (!valid_src_mime_type ($mime_type)) {

        // set defaults
        $mime_type = 'image/png';
        // file details
        $fileDetails = pathinfo ($file);
        $ext = strtolower ($fileDetails["extension"]);
        // mime types
        $types = array (
             'jpg'  => 'image/jpeg',
             'jpeg' => 'image/jpeg',
             'png'  => 'image/png',
             'gif'  => 'image/gif'
         );

        if (strlen ($ext) && strlen ($types[$ext])) {
            $mime_type = $types[$ext];
        }

    }

    return $mime_type;

}


/**
 *
 */
function valid_src_mime_type ($mime_type) {

    if (preg_match ("/jpg|jpeg|gif|png/i", $mime_type)) {
        return true;
    }

    return false;

}


/**
 *
 */
function check_cache ($mime_type) {

	if (CACHE_USE) {
		// make sure cache dir exists
		if (!file_exists (DIRECTORY_CACHE)) {
			// give 777 permissions so that developer can overwrite
			// files created by web server user
			mkdir (DIRECTORY_CACHE);
			chmod (DIRECTORY_CACHE, 0777);
		}

		show_cache_file ($mime_type);
	}

}


/**
 *
 */
function show_cache_file ($mime_type) {

    $cache_file = get_cache_file ($mime_type);

    if (file_exists ($cache_file)) {

        $gmdate_mod = gmdate ("D, d M Y H:i:s", filemtime($cache_file));

        if(! strstr ($gmdate_mod, "GMT")) {
            $gmdate_mod .= " GMT";
        }

        if (isset ($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {

            // check for updates
            $if_modified_since = preg_replace ("/;.*$/", "", $_SERVER["HTTP_IF_MODIFIED_SINCE"]);

            if ($if_modified_since == $gmdate_mod) {
                header ('HTTP/1.1 304 Not Modified');
                die();
            }

        }

		clearstatcache ();
        $fileSize = filesize ($cache_file);

        // send headers then display image
        header ('Content-Type: ' . $mime_type);
        header ('Accept-Ranges: bytes');
        header ('Last-Modified: ' . $gmdate_mod);
        header ('Content-Length: ' . $fileSize);
        header ('Cache-Control: max-age=9999, must-revalidate');
        header ('Expires: ' . $gmdate_mod);

		if (!@readfile ($cache_file)) {
			$content = file_get_contents ($cache_file);
        	if ($content != FALSE) {
				echo $content;
				die();
			} else {
				displayError ('cache file could not be loaded');
			}
		}

        die();

    }

}


/**
 *
 */
function get_cache_file ($mime_type) {

    global $lastModified;
    static $cache_file;

	$file_type = '.png';

	if (stristr ($mime_type, 'jpeg')) {
		$file_type = '.jpg';
    }

    if (!$cache_file) {
        $cache_file = DIRECTORY_CACHE . '/' . md5 ($_SERVER ['QUERY_STRING'] . VERSION . $lastModified) . $file_type;
    }

    return $cache_file;

}


/**
 * check to if the url is valid or not
 */
function valid_extension ($ext) {

    if (preg_match ("/jpg|jpeg|png|gif/i", $ext)) {
        return TRUE;
    } else {
        return FALSE;
    }

}


/**
 *
 */
function checkExternal ($src) {

	global $allowedSites;

    if (preg_match ('/http:\/\//', $src) == true) {

        $url_info = parse_url ($src);

        $isAllowedSite = false;
        foreach ($allowedSites as $site) {
			$site = '/' . addslashes ($site) . '/';
            if (preg_match ($site, $url_info['host']) == true) {
                $isAllowedSite = true;
            }
		}

		if ($isAllowedSite) {

			$fileDetails = pathinfo ($src);
			$ext = strtolower ($fileDetails['extension']);

			$filename = md5 ($src);
			$local_filepath = DIRECTORY_TEMP . '/' . $filename . '.' . $ext;

			if (!file_exists ($local_filepath)) {

				if (function_exists ('curl_init')) {

					$fh = fopen ($local_filepath, 'w');
					$ch = curl_init ($src);

					curl_setopt ($ch, CURLOPT_URL, $src);
					curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);
					curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
					curl_setopt ($ch, CURLOPT_HEADER, 0);
					curl_setopt ($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0');
					curl_setopt ($ch, CURLOPT_FILE, $fh);

					if (curl_exec ($ch) === FALSE) {
						if (file_exists ($local_filepath)) {
							unlink ($local_filepath);
						}
						displayError ('error reading file ' . $src . ' from remote host: ' . curl_error($ch));
					}

					curl_close ($ch);
					fclose ($fh);

                } else {

					if (!$img = file_get_contents($src)) {
						displayError('remote file for ' . $src . ' can not be accessed. It is likely that the file permissions are restricted');
					}

					if (file_put_contents ($local_filepath, $img) == FALSE) {
						displayError ('error writing temporary file');
					}

				}

				if (!file_exists($local_filepath)) {
					displayError('local file for ' . $src . ' can not be created');
				}

			}

			$src = $local_filepath;

		} else {

			displayError('remote host "' . $url_info['host'] . '" not allowed');

		}

    }

    return $src;

}


/**
 * tidy up the image source url
 */
function cleanSource ($src) {
	$host = str_replace ('www.', '', $_SERVER['HTTP_HOST']);
	$regex = "/^((ht|f)tp(s|):\/\/)(www\.|)" . $host . "/i";

	$src = preg_replace ($regex, '', $src);
	$src = strip_tags ($src);
    $src = checkExternal ($src);

    // remove slash from start of string
    if (strpos ($src, '/') === 0) {
        $src = substr ($src, -(strlen ($src) - 1));
    }

    // don't allow users the ability to use '../'
    // in order to gain access to files below document root
    $src = preg_replace ("/\.\.+\//", "", $src);

    // get path to image on file system
    $src = get_document_root ($src) . '/' . $src;

    return $src;

}


/**
 *
 */
function get_document_root ($src) {

    // check for unix servers
    if (file_exists ($_SERVER['DOCUMENT_ROOT'] . '/' . $src)) {
        return $_SERVER['DOCUMENT_ROOT'];
    }

    // check from script filename (to get all directories to timthumb location)
    $parts = array_diff (explode ('/', $_SERVER['SCRIPT_FILENAME']), explode('/', $_SERVER['DOCUMENT_ROOT']));
    $path = $_SERVER['DOCUMENT_ROOT'];
    foreach ($parts as $part) {
        $path .= '/' . $part;
        if (file_exists($path . '/' . $src)) {
            return $path;
        }
    }

    // the relative paths below are useful if timthumb is moved outside of document root
    // specifically if installed in wordpress themes like mimbo pro:
    // /wp-content/themes/mimbopro/scripts/timthumb.php
    $paths = array (
        ".",
        "..",
        "../..",
        "../../..",
        "../../../..",
        "../../../../.."
    );

    foreach ($paths as $path) {
        if (file_exists($path . '/' . $src)) {
            return $path;
        }
    }

    // special check for microsoft servers
    if (!isset ($_SERVER['DOCUMENT_ROOT'])) {
        $path = str_replace ("/", "\\", $_SERVER['ORIG_PATH_INFO']);
        $path = str_replace ($path, "", $_SERVER['SCRIPT_FILENAME']);

        if (file_exists ($path . '/' . $src)) {
            return $path;
        }
    }

    displayError ('file not found ' . $src);

}


/**
 * generic error message
 */
function displayError ($errorString = '') {

    header ('HTTP/1.1 400 Bad Request');
	echo '<pre>' . htmlentities($errorString);
	echo '<br />Query String : ' . $_SERVER['QUERY_STRING'];
	echo '<br />TimThumb version : ' . VERSION . '</pre>';
    die();

}
?>