Minigalnano/createthumb.php
Sebastien SAUVAGE c6b911cc29 Version 0.3.7
* Version number now starts at 0.3.7
* Added thumbnail cache.
* Added optional folder comment and image title/caption
* darkgold2 theme from version 0.2.3 adapted to this version.
* darkgold2 is now the default theme.
* Increased thumbnail size.
* Increased number of images per page.
* Page is now in UTF-8 by default to support international characters.
* Removed many warnings.
* Corrected XSS vulnerability.
* Added htaccess to prevent raw browsing of images folder.
* Removed version check against original author's website.
2013-03-23 18:46:00 +01:00

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<?php
/*
MINIGAL NANO
- A PHP/HTML/CSS based image gallery script
This script and included files are subject to licensing from Creative Commons (http://creativecommons.org/licenses/by-sa/2.5/)
You may use, edit and redistribute this script, as long as you pay tribute to the original author by NOT removing the linkback to www.minigal.dk ("Powered by MiniGal Nano x.x.x")
MiniGal Nano is created by Thomas Rybak
Copyright 2010 by Thomas Rybak
Support: www.minigal.dk
Community: www.minigal.dk/forum
Please enjoy this free script!
Version 0.3.5 modified by Sebastien SAUVAGE (sebsauvage.net):
- Added thumbnail cache (reduces server CPU load, server bandwith and speeds up client page display).
- Thumbnails are now always in JPEG even if the source image is PNG or GIF.
USAGE EXAMPLE:
File: createthumb.php
Example: <img src="createthumb.php?filename=photo.jpg&amp;width=100&amp;height=100">
*/
// error_reporting(E_ALL);
error_reporting(0);
/*
if (preg_match("/.jpg$|.jpeg$/i", $_GET['filename'])) header('Content-type: image/jpeg');
if (preg_match("/.gif$/i", $_GET['filename'])) header('Content-type: image/gif');
if (preg_match("/.png$/i", $_GET['filename'])) header('Content-type: image/png');
*/
function str_split_php4( $text, $split = 1 ) {
// place each character of the string into and array
$array = array();
for ( $i=0; $i < strlen( $text ); ){
$key = NULL;
for ( $j = 0; $j < $split; $j++, $i++ ) {
$key .= $text[$i];
}
array_push( $array, $key );
}
return $array;
}
function sanitize($name)
{
// Sanitize image filename (taken from http://iamcam.wordpress.com/2007/03/20/clean-file-names-using-php-preg_replace/ )
$fname=$name;
$replace="_";
$pattern="/([[:alnum:]_\.-]*)/";
$fname=str_replace(str_split_php4(preg_replace($pattern,$replace,$fname)),$replace,$fname);
return $fname;
}
// Make sure the "thumbs" directory exists.
if (!is_dir('thumbs')) { 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($cacheContent);
}
else // otherwise, generate thumbnail, send it and save it to file.
{
// Display error image if file isn't found
if (!is_file($_GET['filename'])) {
header('Content-type: image/jpeg');
$errorimage = ImageCreateFromJPEG('images/questionmark.jpg');
ImageJPEG($errorimage,null,90);
}
// Display error image if file exists, but can't be opened
if (substr(decoct(fileperms($_GET['filename'])), -1, strlen(fileperms($_GET['filename']))) < 4 OR substr(decoct(fileperms($_GET['filename'])), -3,1) < 4) {
header('Content-type: image/jpeg');
$errorimage = ImageCreateFromJPEG('images/cannotopen.jpg');
ImageJPEG($errorimage,null,90);
}
// Define variables
$target = "";
$xoord = 0;
$yoord = 0;
if ($_GET['size'] == "") $_GET['size'] = 120; //
$imgsize = GetImageSize($_GET['filename']);
$width = $imgsize[0];
$height = $imgsize[1];
if ($width > $height) { // If the width is greater than the height its 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 = $width;
}
// Rotate JPG pictures
if (preg_match("/.jpg$|.jpeg$/i", $_GET['filename'])) {
if (function_exists('exif_read_data') && function_exists('imagerotate')) {
$exif = exif_read_data($_GET['filename']);
$ort = $exif['IFD0']['Orientation'];
$degrees = 0;
switch($ort)
{
case 6: // 90 rotate right
$degrees = 270;
break;
case 8: // 90 rotate left
$degrees = 90;
break;
}
if ($degrees != 0) $target = imagerotate($target, $degrees, 0);
}
}
$target = ImageCreatetruecolor($_GET['size'],$_GET['size']);
if (preg_match("/.jpg$/i", $_GET['filename'])) $source = ImageCreateFromJPEG($_GET['filename']);
if (preg_match("/.gif$/i", $_GET['filename'])) $source = ImageCreateFromGIF($_GET['filename']);
if (preg_match("/.png$/i", $_GET['filename'])) $source = ImageCreateFromPNG($_GET['filename']);
imagecopyresampled($target,$source,0,0,$xoord,$yoord,$_GET['size'],$_GET['size'],$width,$height);
imagedestroy($source);
//if (preg_match("/.jpg$/i", $_GET['filename'])) ImageJPEG($target,null,90);
//if (preg_match("/.gif$/i", $_GET['filename'])) ImageGIF($target,null,90);
//if (preg_match("/.png$/i", $_GET['filename'])) ImageJPEG($target,null,90); // Using ImageJPEG on purpose
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
$fd = fopen($thumbname, "w"); // Save buffer to disk
if ($fd) { fwrite($fd,$cachedImage); fclose($fd); }
}
?>