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thumb.php
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thumb.php
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<?php
/*
Title: Thumb.php
URL: http://github.com/jamiebicknell/Thumb
Author: Jamie Bicknell
Twitter: @jamiebicknell
*/
define('THUMB_CACHE', './cache/'); // Path to cache directory (must be writeable)
define('THUMB_CACHE_AGE', 86400); // Duration of cached files in seconds
define('THUMB_BROWSER_CACHE', true); // Browser cache true or false
define('SHARPEN_MIN', 12); // Minimum sharpen value
define('SHARPEN_MAX', 28); // Maximum sharpen value
define('ADJUST_ORIENTATION', true); // Auto adjust orientation for JPEG true or false
$src = isset($_GET['src']) ? $_GET['src'] : false;
$size = isset($_GET['size']) ? str_replace(array('<', 'x'), '', $_GET['size']) != '' ? $_GET['size'] : 100 : 100;
$crop = isset($_GET['crop']) ? max(0, min(1, $_GET['crop'])) : 1;
$trim = isset($_GET['trim']) ? max(0, min(1, $_GET['trim'])) : 0;
$zoom = isset($_GET['zoom']) ? max(0, min(1, $_GET['zoom'])) : 0;
$align = isset($_GET['align']) ? $_GET['align'] : false;
$sharpen = isset($_GET['sharpen']) ? max(0, min(100, $_GET['sharpen'])) : 0;
$gray = isset($_GET['gray']) ? max(0, min(1, $_GET['gray'])) : 0;
$ignore = isset($_GET['ignore']) ? max(0, min(1, $_GET['ignore'])) : 0;
$path = parse_url($src);
if (isset($path['scheme'])) {
$base = parse_url('http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
if (preg_replace('/^www\./i', '', $base['host']) == preg_replace('/^www\./i', '', $path['host'])) {
$base = explode('/', preg_replace('/\/+/', '/', $base['path']));
$path = explode('/', preg_replace('/\/+/', '/', $path['path']));
$temp = $path;
$part = count($base);
foreach ($base as $k => $v) {
if ($v == $path[$k]) {
array_shift($temp);
} else {
if ($part - $k > 1) {
$temp = array_pad($temp, 0 - (count($temp) + ($part - $k) - 1), '..');
break;
} else {
$temp[0] = './' . $temp[0];
}
}
}
$src = implode('/', $temp);
}
}
if (!extension_loaded('gd')) {
die('GD extension is not installed');
}
if (!is_writable(THUMB_CACHE)) {
die('Cache not writable');
}
if (isset($path['scheme']) || !file_exists($src)) {
die('File cannot be found');
}
if (!in_array(strtolower(substr(strrchr($src, '.'), 1)), array('gif', 'jpg', 'jpeg', 'png'))) {
die('File is not an image');
}
$file_salt = 'v1.0.4';
$file_size = filesize($src);
$file_time = filemtime($src);
$file_date = gmdate('D, d M Y H:i:s T', $file_time);
$file_type = strtolower(substr(strrchr($src, '.'), 1));
$file_hash = md5($file_salt . ($src.$size.$crop.$trim.$zoom.$align.$sharpen.$gray.$ignore) . $file_time);
$file_temp = THUMB_CACHE . $file_hash . '.img.txt';
$file_name = basename(substr($src, 0, strrpos($src, '.')) . strtolower(strrchr($src, '.')));
if (!file_exists(THUMB_CACHE . 'index.html')) {
touch(THUMB_CACHE . 'index.html');
}
if (($fp = fopen(THUMB_CACHE . 'index.html', 'r')) !== false) {
if (flock($fp, LOCK_EX)) {
if (time() - THUMB_CACHE_AGE > filemtime(THUMB_CACHE . 'index.html')) {
$files = glob(THUMB_CACHE . '*.img.txt');
if (is_array($files) && count($files) > 0) {
foreach ($files as $file) {
if (time() - THUMB_CACHE_AGE > filemtime($file)) {
unlink($file);
}
}
}
touch(THUMB_CACHE . 'index.html');
}
flock($fp, LOCK_UN);
}
fclose($fp);
}
if (THUMB_BROWSER_CACHE && (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) || isset($_SERVER['HTTP_IF_NONE_MATCH']))) {
if ($_SERVER['HTTP_IF_MODIFIED_SINCE'] == $file_date && $_SERVER['HTTP_IF_NONE_MATCH'] == $file_hash) {
header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
die();
}
}
if (!file_exists($file_temp)) {
list($w0, $h0, $type) = getimagesize($src);
$data = file_get_contents($src);
if ($ignore && $type == 1) {
if (preg_match('/\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)/s', $data)) {
header('Content-Type: image/gif');
header('Content-Length: ' . $file_size);
header('Content-Disposition: inline; filename="' . $file_name . '"');
header('Last-Modified: ' . $file_date);
header('ETag: ' . $file_hash);
header('Accept-Ranges: none');
if (THUMB_BROWSER_CACHE) {
header('Cache-Control: max-age=604800, must-revalidate');
header('Expires: ' . gmdate('D, d M Y H:i:s T', strtotime('+7 days')));
} else {
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Expires: ' . gmdate('D, d M Y H:i:s T'));
header('Pragma: no-cache');
}
die($data);
}
}
$oi = imagecreatefromstring($data);
if (ADJUST_ORIENTATION && $type == 2) {
// I know supressing errors is bad, but calling exif_read_data on invalid
// or corrupted data returns a fatal error and there's no way to validate
// the EXIF data before calling the function.
$exif = @exif_read_data($src, EXIF);
if (isset($exif['Orientation'])) {
$degree = 0;
$mirror = false;
switch ($exif['Orientation']) {
case 2:
$mirror = true;
break;
case 3:
$degree = 180;
break;
case 4:
$degree = 180;
$mirror = true;
break;
case 5:
$degree = 270;
$mirror = true;
$w0 ^= $h0 ^= $w0 ^= $h0;
break;
case 6:
$degree = 270;
$w0 ^= $h0 ^= $w0 ^= $h0;
break;
case 7:
$degree = 90;
$mirror = true;
$w0 ^= $h0 ^= $w0 ^= $h0;
break;
case 8:
$degree = 90;
$w0 ^= $h0 ^= $w0 ^= $h0;
break;
}
if ($degree > 0) {
$oi = imagerotate($oi, $degree, 0);
}
if ($mirror) {
$nm = $oi;
$oi = imagecreatetruecolor($w0, $h0);
imagecopyresampled($oi, $nm, 0, 0, $w0 - 1, 0, $w0, $h0, -$w0, $h0);
imagedestroy($nm);
}
}
}
list($w,$h) = explode('x', str_replace('<', '', $size) . 'x');
$w = ($w != '') ? floor(max(8, min(1500, $w))) : '';
$h = ($h != '') ? floor(max(8, min(1500, $h))) : '';
if (strstr($size, '<')) {
$h = $w;
$crop = 0;
$trim = 1;
} elseif (!strstr($size, 'x')) {
$h = $w;
} elseif ($w == '' || $h == '') {
$w = ($w == '') ? ($w0 * $h) / $h0 : $w;
$h = ($h == '') ? ($h0 * $w) / $w0 : $h;
$crop = 0;
$trim = 1;
}
$trim_w = ($trim) ? 1 : ($w == '') ? 1 : 0;
$trim_h = ($trim) ? 1 : ($h == '') ? 1 : 0;
if ($crop) {
$w1 = (($w0 / $h0) > ($w / $h)) ? floor($w0 * $h / $h0) : $w;
$h1 = (($w0 / $h0) < ($w / $h)) ? floor($h0 * $w / $w0) : $h;
if (!$zoom) {
if ($h0 < $h || $w0 < $w) {
$w1 = $w0;
$h1 = $h0;
}
}
} else {
$w1 = (($w0 / $h0) < ($w / $h)) ? floor($w0 * $h / $h0) : floor($w);
$h1 = (($w0 / $h0) > ($w / $h)) ? floor($h0 * $w / $w0) : floor($h);
$w = floor($w);
$h = floor($h);
if (!$zoom) {
if ($h0 < $h && $w0 < $w) {
$w1 = $w0;
$h1 = $h0;
}
}
}
$w = ($trim_w) ? (($w0 / $h0) > ($w / $h)) ? min($w, $w1) : $w1 : $w;
$h = ($trim_h) ? (($w0 / $h0) < ($w / $h)) ? min($h, $h1) : $h1 : $h;
if ($sharpen) {
$matrix = array (
array(-1, -1, -1),
array(-1, SHARPEN_MAX - ($sharpen * (SHARPEN_MAX - SHARPEN_MIN)) / 100, -1),
array(-1, -1, -1));
$divisor = array_sum(array_map('array_sum', $matrix));
}
$x = strpos($align, 'l') !== false ? 0 : (strpos($align, 'r') !== false ? $w - $w1 : ($w - $w1) / 2);
$y = strpos($align, 't') !== false ? 0 : (strpos($align, 'b') !== false ? $h - $h1 : ($h - $h1) / 2);
$im = imagecreatetruecolor($w, $h);
$bg = imagecolorallocate($im, 255, 255, 255);
imagefill($im, 0, 0, $bg);
switch ($type) {
case 1:
imagecopyresampled($im, $oi, $x, $y, 0, 0, $w1, $h1, $w0, $h0);
if ($sharpen && version_compare(PHP_VERSION, '5.1.0', '>=')) {
imageconvolution($im, $matrix, $divisor, 0);
}
if ($gray) {
imagefilter($im, IMG_FILTER_GRAYSCALE);
}
imagegif($im, $file_temp);
break;
case 2:
imagecopyresampled($im, $oi, $x, $y, 0, 0, $w1, $h1, $w0, $h0);
if ($sharpen && version_compare(PHP_VERSION, '5.1.0', '>=')) {
imageconvolution($im, $matrix, $divisor, 0);
}
if ($gray) {
imagefilter($im, IMG_FILTER_GRAYSCALE);
}
imagejpeg($im, $file_temp, 100);
break;
case 3:
imagefill($im, 0, 0, imagecolorallocatealpha($im, 0, 0, 0, 127));
imagesavealpha($im, true);
imagealphablending($im, false);
imagecopyresampled($im, $oi, $x, $y, 0, 0, $w1, $h1, $w0, $h0);
if ($sharpen && version_compare(PHP_VERSION, '5.1.0', '>=')) {
$fix = imagecolorat($im, 0, 0);
imageconvolution($im, $matrix, $divisor, 0);
imagesetpixel($im, 0, 0, $fix);
}
if ($gray) {
imagefilter($im, IMG_FILTER_GRAYSCALE);
}
imagepng($im, $file_temp);
break;
}
imagedestroy($im);
imagedestroy($oi);
}
header('Content-Type: image/' . $file_type);
header('Content-Length: ' . filesize($file_temp));
header('Content-Disposition: inline; filename="' . $file_name . '"');
header('Last-Modified: ' . $file_date);
header('ETag: ' . $file_hash);
header('Accept-Ranges: none');
if (THUMB_BROWSER_CACHE) {
header('Cache-Control: max-age=604800, must-revalidate');
header('Expires: ' . gmdate('D, d M Y H:i:s T', strtotime('+7 days')));
} else {
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Expires: ' . gmdate('D, d M Y H:i:s T'));
header('Pragma: no-cache');
}
readfile($file_temp);