*/
error_reporting(0);
$get_filename = $_GET['filename'];
$get_size = @$_GET['size'];
if (empty($get_size)) $get_size = 120;
if (preg_match("/^\/.*/i", $get_filename)) die("Unauthorized access !");
if (preg_match("/.jpe?g$/i", $get_filename)) $get_filename_type = "JPG";
if (preg_match("/.gif$/i", $get_filename)) $get_filename_type = "GIF";
if (preg_match("/.png$/i", $get_filename)) $get_filename_type = "PNG";
/**
* Vertical flip
* @author http://stackoverflow.com/questions/8232722/how-to-flip-part-of-an-image-horizontal-with-php-gd
*/
function flipVertical(&$img) {
$size_x = imagesx($img);
$size_y = imagesy($img);
$temp = imagecreatetruecolor($size_x, $size_y);
$x = imagecopyresampled($temp, $img, 0, 0, 0, ($size_y-1), $size_x, $size_y, $size_x, 0-$size_y);
if ($x)
{
$img = $temp;
} else {
die("Unable to flip image");
}
}
/**
* Horizontal flip
* @author http://stackoverflow.com/questions/8232722/how-to-flip-part-of-an-image-horizontal-with-php-gd
*/
function flipHorizontal(&$img) {
$size_x = imagesx($img);
$size_y = imagesy($img);
$temp = imagecreatetruecolor($size_x, $size_y);
$x = imagecopyresampled($temp, $img, 0, 0, ($size_x-1), 0, $size_x, $size_y, 0-$size_x, $size_y);
if ($x)
{
$img = $temp;
} else {
die("Unable to flip image");
}
}
/**
* Sanitizing (this allows for collisions)
*/
function sanitize($name) {
return preg_replace("/[^[:alnum:]_.-]/", "_", $name);
}
// Make sure the "thumbs" directory exists.
if (!is_dir('thumbs') && is_writable('.'))
{
mkdir('thumbs',0700);
}
// Thumbnail file name and path.
// (We always put thumbnails in jpg for simplification)
$thumbname = 'thumbs/'.sanitize($get_filename).'.jpg';
if (file_exists($thumbname)) // If thumbnail exists, serve it.
{
$fd = fopen($thumbname, "r");
$cacheContent = fread($fd, filesize($thumbname));
fclose($fd);
header('Content-type: image/jpeg');
echo($cacheContent);
exit;
}
// Display error image if file isn't found
if (!is_file($get_filename)) {
header('Content-type: image/jpeg');
$errorimage = imagecreatefromjpeg('images/questionmark.jpg');
imagejpeg($errorimage, null, 90);
imagedestroy($errorimage);
exit;
}
// Display error image if file exists, but can't be opened
if (!is_readable($get_filename)) {
header('Content-type: image/jpeg');
$errorimage = imagecreatefromjpeg('images/cannotopen.jpg');
imagejpeg($errorimage, null, 90);
imagedestroy($errorimage);
exit;
}
// otherwise, generate thumbnail, send it and save it to file.
$target = "";
$xoord = 0;
$yoord = 0;
$imgsize = getimagesize($get_filename);
$width = $imgsize[0];
$height = $imgsize[1];
if ($width > $height) // If the width is greater than the height it’s a horizontal picture
{
$xoord = ceil(($width-$height)/2);
$width = $height; // Then we read a square frame that equals the width
}
else
{
$yoord = ceil(($height-$width)/2);
$height = $width;
}
// Rotate JPG pictures
// for more info on orientation see
// http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/
$degrees = 0;
$flip = '';
if (preg_match("/.jpg$|.jpeg$/i", $_GET['filename'])) {
if (function_exists('exif_read_data') && function_exists('imagerotate')) {
$exif = exif_read_data($_GET['filename'], 0, true);
$ort = $exif['IFD0']['Orientation'];
switch ($ort) {
case 3: // 180 rotate right
$degrees = 180;
break;
case 6: // 90 rotate right
$degrees = 270;
break;
case 8: // 90 rotate left
$degrees = 90;
break;
case 2: // flip vertical
$flip = 'vertical';
break;
case 7: // flipped
$degrees = 90;
$flip = 'vertical';
break;
case 5: // flipped
$degrees = 270;
$flip = 'vertical';
break;
case 4: // flipped
$degrees = 180;
$flip = 'vertical';
break;
}
}
}
$target = imagecreatetruecolor($get_size, $get_size);
// if the picture can be transparent, add a white background
if (in_array($get_filename_type, array("GIF", "PNG")))
{
$backgroundColor = imagecolorallocate($target, 255, 255, 255);
imagefill($target, 0, 0, $backgroundColor);
}
if ($get_filename_type == "JPG") $source = imagecreatefromjpeg($get_filename);
if ($get_filename_type == "GIF") $source = imagecreatefromgif($get_filename);
if ($get_filename_type == "PNG") $source = imagecreatefrompng($get_filename);
imagecopyresampled($target, $source, 0, 0, $xoord, $yoord, $get_size, $get_size, $width, $height);
imagedestroy($source);
//proper rotation by jan niggemann
if ($degrees != 0)
{
$target = imagerotate($target, $degrees, 0);
}
//proper mirror (aka flip) by jan niggemann
if ($flip == 'vertical')
{
//only in php >= 5.5.0 ImageJPEG(imageflip($target, IMG_FLIP_VERTICAL),null,80);
flipVertical($target);
flipHorizontal($target);
flipVertical($target);
}
ob_start(); // Start output buffering.
header('Content-type: image/jpeg'); // We always render the thumbnail in JPEG even if the source is GIF or PNG.
imagejpeg($target, null, 80);
imagedestroy($target);
$cachedImage = ob_get_contents(); // Get the buffer content.
ob_end_flush(); // End buffering
if (is_writable(dirname($thumbname)))
{
$fd = fopen($thumbname, "w"); // Save buffer to disk
if ($fd)
{
fwrite($fd,$cachedImage);
fclose($fd);
}
}