product_thumb.php

<?php
// This is "On the Fly Thumbnailer with Caching Option" by Pallieter Koopmans.
// Based on Marcello Colaruotolo (1.5.1) which builds upon Nathan Welch (1.5)
// and Roberto Ghizzi. With improvements by @Quest WebDesign, http://atQuest.nl/,
// Martijn Loeffen (browser-caching and thumbnail-cache-dir) and Richard Burford
// aka psynaptic (admin control and documentation)
//
// Scales product images dynamically, resulting in smaller file sizes, and keeps
// proper image ratio.
//
// Used in conjunction with modified tep_image in html_output.php (see: readme.html).

// get config values from the database
require('includes/configure.php'); // include server parameters
$server = DB_SERVER;
$username = DB_SERVER_USERNAME;
$password = DB_SERVER_PASSWORD;
$database = DB_DATABASE;
$connect=@mysql_connect($server,$username,$password) or http_headers('','Error,Database Connection'); 
@mysql_select_db($database,$connect) or http_headers('','Error,Database Connection');
$query="select configuration_key as cfgKey, configuration_value as cfgValue from configuration where configuration_group_id='100'"; 
$output=@mysql_query($query,$connect) or http_headers('','Error,Database Connection');
while ($row = @mysql_fetch_array($output)) {define($row['cfgKey'], $row['cfgValue']);}

// CONFIGURATION SETTINGS
//
// Server cache directory. Set the value below to true to generate resampled thumbnails
// resulting in smoother-looking images. Not supported in GD ver. < 2.01
$use_resampling = true; if (THUMBNAIL_USE_RESAMPLING === 'false') {$use_resampling = false;}
//
// Create True Color Thumbnails? Better quality overall but set to false if you
// have GD version < 2.01 or if creating transparent thumbnails.
$use_truecolor = true; if (THUMBNAIL_TRUE_COLOUR === 'false') {$use_truecolor = false;}
//
// Output GIFs as JPEGS? Set this option to true if you have GD version > 1.6
// and want to output GIF thumbnails as JPGs instead of GIFs or PNGs. Note that your
// GIF transparencies will not be retained in the thumbnail if you output them
// as JPGs. If you have GD Library < 1.6 with GIF create support, GIFs will
// be output as GIFs. Set the "matte" color below if setting this option to true.
$gif_as_jpeg = false; if (THUMBNAIL_OUTPUT_JPEG === 'true') {$gif_as_jpeg = true;}
//
// Cache Images on the server? Set to true if you want to save requested thumbnails
// on disk. This will add to disk space but will save your processor from having to
// create the thumbnail for every visitor.
$tn_server_cache = true; if (THUMBNAIL_CACHE_SERVER === 'false') {$tn_server_cache = false;}
//
// Thumbnail Path. If server-caching is enabled, specify a sub-directory
// where the thumbnails should be kept. Use '' for the default images-directory,
// which is /catalog/images/
// Note: Make sure this path actually exists as a subdirectory and is writeable!
$tn_path = THUMBNAIL_PATH; // The default is 'thumbnails/', should be chmod 777
//
// Cache Images in Browser-Cache? Set to true if you want browsers to be able to
// cache viewed thumbnails in their own cache. This will save bandwidth for every
// visitor that views the same thumbnail again. The default is true
$tn_browser_cache = true; if (THUMBNAIL_CACHE_BROWSER === 'false') {$tn_browser_cache = false;}
//
// Send a 404 http response when an image is not found
// If set to false, will show a small error-image (as in version < 2.0.0)
$use404 = true; // The default is true
//
// Define RGB Color Value for background matte color if outputting GIFs as JPEGs
// Example: white is r=255, b=255, g=255; black is r=0, b=0, g=0; red is r=255, b=0, g=0;
$tn_colours = explode(",", THUMBNAIL_BACKGROUND_MATTE);
$r = $tn_colours[0]; $g = $tn_colours[1]; $b = $tn_colours[2];
//
// Allow the creation of thumbnail images that are larger than the original images:
$allow_larger = false; if (THUMBNAIL_ALLOW_LARGER === 'true') {$allow_larger = true;}
//
// If allow_larger is set to false, you can opt to output the original image:
// Better leave it true if you want pixel_trans_* to work as expected
$show_original = true; if (THUMBNAIL_SHOW_ORIGINAL == 'false') {$show_original = false;}
//
// Set jpeg compression quality for resampled images.
$jpeg_quality=THUMBNAIL_JPEG_COMPRESSION; // The default is 100.
// END CONFIGURATION SETTINGS

// Note: In order to manually debug this script, you might want to comment
// some header() lines -- otherwise no output is shown.

// reverse strrchr(), taken from http://nl2.php.net/manual/en/function.strrchr.php
function reverse_strrchr($haystack, $needle)
{
	return strrpos($haystack, $needle) ? substr($haystack, 0, strrpos($haystack, $needle) +1 ) : false;
}

function modify_tn_path($file)
{
	global $tn_path;

	if ($tn_path=='') return $file;
	else{
		// append the thumbnail-path to the path
		$pathSep = "/";	//$pathSep = strstr(PHP_OS, "WIN") ? "\\" : "/";;
		$path = reverse_strrchr($file,$pathSep);
		error_reporting(E_ALL);
		if ($path===false) return $tn_path . $file;
		else return str_replace($path,$path . $tn_path,$file);
	}
}

function http_headers($file='')
{
	//
	// This function supports the use of browser-caching (optional)
	//
	// A 304 (Not Modified) will be sent when the thumbnail has not changed
	//       since the time it was last cached by the client
	// A 200 (OK) will be sent when the thumbnail was not cached by the client
	//       or when the thumbnail was cached but changed afterwards
	// A 404 (Not Found) will be sent when the thumbnail is not found (optional)
	global $use404, $tn_browser_cache;

	if (isset($_SERVER["SERVER_PROTOCOL"]) && $_SERVER["SERVER_PROTOCOL"] == "HTTP/1.1") 
		$httpProtocol = "HTTP/1.1";
	else
		$httpProtocol = "HTTP/1.0";

	if (file_exists($file))
	{

		if (isset ($_SERVER["HTTP_CACHE_CONTROL"])) {
			$tn_browser_cache = strtolower($_SERVER["HTTP_CACHE_CONTROL"]) == "no-cache" ? false : $tn_browser_cache ;
		}

		//Build our entity tag, which is "inode-lastmodtime-filesize"
		$lastModified = filemtime($file);
		$lastModifiedGMT = $lastModified - date('Z');
		$lastModifiedHttpFormat = gmstrftime("%a, %d %b %Y %T %Z", $lastModified);
		// Don't use inode in eTag when you have multiple webservers, instead I use a dummy value (1fa44b7)
		$eTag = '"1fa44b7-' . dechex(filesize($file)) . "-" . dechex($lastModifiedGMT) . '"';

		if ($tn_browser_cache){

			$lastModifiedFromHttp = "xxx";
			if (isset ($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {
				$lastModifiedFromHttp = ($_SERVER["HTTP_IF_MODIFIED_SINCE"] === "") ? "xxx" : $_SERVER["HTTP_IF_MODIFIED_SINCE"] ;
			}

			// Read sent eTag by browser
			$foundETag = "";
			if (isset ($_SERVER["HTTP_IF_NONE_MATCH"])) {
				$foundETag = stripslashes($_SERVER["HTTP_IF_NONE_MATCH"]);
			}

			// Last Modification Time
			if ($lastModifiedFromHttp == $lastModifiedHttpFormat) {
				$sameLastModified = true;
			}
			elseif (strpos($lastModifiedFromHttp,$lastModifiedHttpFormat) !== false){
				$sameLastModified = true;
			}
			else {
				$sameLastModified = false;
			}

			if (($eTag == $foundETag) && $sameLastModified){
				// same eTag and Last Modification Time (e.g. with Firefox)
				$is304 = true;
			}
			else
				// no eTag supplied, but Last Modification Time is unchanged (e.g. with IE 6.0)
			$is304 = (($foundETag == "") && $sameLastModified);

			if ($is304)
			{
				//
				// They already have an up to date copy so tell them
				if ($lastModifiedGMT > 946080000) {        // 946080000 = Dec 24, 1999 4PM
					// only send if valid eTag
					header("ETag: " . $eTag);
				}
				header("Status: 304 Not Modified");
				header($httpProtocol . " 304 Not Modified");
				header("Connection: close");
				exit();
			}
		}

		//
		// We have to send them the whole page
		header('Pragma: ');
		header('Expires: ');
		if ($tn_browser_cache){
			if ($lastModifiedGMT > 946080000) {        // 946080000 = Dec 24, 1999 4PM
				header('ETag: ' . $eTag);
			}
			header('Last-Modified: ' . $lastModifiedHttpFormat);
			header('Cache-Control: private');
		}
		else {
			header('Cache-Control: no-cache');
		}

	}
	else
	{
		if ($use404)
		{
			//
			// send them a 404 http response header
			header("TEST404: TEST404");
			header("Status: 404 Not Found");
			header($httpProtocol . " 404 Not Found");
			exit();
		}
		else
		{
			//
			// show a custom error-image (non-cacheable by the browser)			
			header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");				// Date in the past
			header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");	// Always modified
			header("Cache-Control: no-store, no-cache, must-revalidate");	// HTTP/1.1
			header("Cache-Control: post-check=0, pre-check=0", false);		// HTTP/1.1
			header("Pragma: no-cache");										// HTTP/1.0
			header('Content-type: image/jpeg');
			$src = imagecreate($_GET['w'], $_GET['h']);						// Create a blank image.
			$bgc = imagecolorallocate($src, 255, 255, 255);
			$tc  = imagecolorallocate($src, 0, 0, 0);
			imagefilledrectangle($src, 0, 0, $_GET['w'], $_GET['h'], $bgc);
			imagestring($src, 1, 5, 5, 'Error', $tc);
			imagejpeg($src, '', $jpeg_quality);
			imagedestroy($src);
			exit();
		}
	}
}

// Get the size of the image:
$image = @getimagesize($_GET['img']);

// Check the input variables and decide what to do:
if (empty($image) || empty($_GET['w']) || empty($_GET['h']) || (empty($allow_larger) && ($_GET['w'] > $image[0] || $_GET['h'] > $image[1])))
{
	if (empty($image) || empty($show_original))
	{
		http_headers();
	}
	else
	{
	// 2Do: Return the original image w/o making a copy (as that is what we currently do):
// 	$_GET['w'] = $image[0];
// 	$_GET['h'] = $image[1];
	}
}

// Create appropriate image header:
if ($image[2] == 2 || ($image[2] == 1 && $gif_as_jpeg))
{
	header('Content-type: image/jpeg');
	if ($tn_server_cache) $filename = modify_tn_path($_GET['img'] .'.thumb_'.$_GET['w'].'x'.$_GET['h'].'.jpg');
}
elseif ($image[2] == 1 && function_exists('imagegif'))
{
	header('Content-type: image/gif');
	if ($tn_server_cache) $filename = modify_tn_path($_GET['img'] .'.thumb_'.$_GET['w'].'x'.$_GET['h'].'.gif');
}
elseif ($image[2] == 3 || $image[2] == 1)
{
	header('Content-type: image/png');
	if ($tn_server_cache) $filename = modify_tn_path($_GET['img'] .'.thumb_'.$_GET['w'].'x'.$_GET['h'].'.png');
}

// If you are required to set the full path for file_exists(), set this:
// $filename = '/your/path/to/catalog/'.$filename;

if (file_exists($filename) && $tn_server_cache && filemtime($filename) > filemtime($_GET['img']))
{
	// Output Cache Headers
	http_headers($filename);

	if ($image[2] == 2 || ($image[2] == 1 && $gif_as_jpeg))
	{
		$src = imagecreatefromjpeg($filename);
		imagejpeg($src, '', $jpeg_quality);
	}
	elseif ($image[2] == 1 && function_exists('imagegif'))
	{
		$src = imagecreatefromgif($filename);
		imagegif($src);
	}
	elseif ($image[2] == 3 || $image[2] == 1)
	{
		$src = imagecreatefrompng($filename);
		imagepng($src);
	}
	else
	{
		// Not an image or imagecreatefrom...-function does not exits.
		// Let's output an error
		http_headers();
	}
}
else
{
	// create thumbnail directory if not exist.
	$tmp_path = str_replace(basename($filename), '', $filename);
	if (is_dir($tmp_path) == false) mkdir($tmp_path);

	// Create a new, empty image based on settings:
	if (function_exists('imagecreatetruecolor') && $use_truecolor && ($image[2] == 2 || $image[2] == 3))
	{
		$tmp_img = imagecreatetruecolor($_GET['w'],$_GET['h']);
	}
	else
	{
		$tmp_img = imagecreate($_GET['w'],$_GET['h']);
	}

	$th_bg_color = imagecolorallocate($tmp_img, $r, $g, $b);

	imagefill($tmp_img, 0, 0, $th_bg_color);
	imagecolortransparent($tmp_img, $th_bg_color);

	// Create the image to be scaled:
	if ($image[2] == 2 && function_exists('imagecreatefromjpeg'))
	{
		$src = imagecreatefromjpeg($_GET['img']);
	}
	elseif ($image[2] == 1 && function_exists('imagecreatefromgif'))
	{
		$src = imagecreatefromgif($_GET['img']);
	}
	elseif (($image[2] == 3 || $image[2] == 1) && function_exists('imagecreatefrompng'))
	{
		$src = imagecreatefrompng($_GET['img']);
	}
	else
	{
		// Not an image or imagecreatefrom...-function does not exits.
		// Let's output an error
		http_headers();
	}


	// Scale the image based on settings:
	if (empty($allow_larger) && ($_GET['w'] > $image[0] || $_GET['h'] > $image[1]))
	{
		// existing image is smaller than thumbnail so create the thumbnail
		// with the smaller original image centred on it
		$dx = ($_GET['w'] - $image[0]) / 2;
		$dy = ($_GET['h'] - $image[1]) / 2;
		imagecopy($tmp_img, $src, $dx, $dy, 0, 0, $image[0], $image[1]);
		} else
			if (function_exists('imagecopyresampled') && $use_resampling)
		{
			imagecopyresampled($tmp_img, $src, 0, 0, 0, 0, $_GET['w'], $_GET['h'], $image[0], $image[1]);
		}
		else
		{
			imagecopyresized($tmp_img, $src, 0, 0, 0, 0, $_GET['w'], $_GET['h'], $image[0], $image[1]);
		}

		// Output the image:
		if ($image[2] == 2 || ($image[2] == 1 && $gif_as_jpeg))
		{
			if ($tn_server_cache)
			{
				$thumbnail = modify_tn_path($_GET['img'].'.thumb_'.$_GET['w'].'x'.$_GET['h'].'.jpg');
				imagejpeg($tmp_img,$thumbnail, $jpeg_quality);
				http_headers($thumbnail);
			}
			else
			{
				http_headers($_GET['img']);
			}
			imagejpeg($tmp_img, '', $jpeg_quality);
		}
		elseif ($image[2] == 1 && function_exists('imagegif'))
		{
			if ($tn_server_cache)
			{
				$thumbnail = modify_tn_path($_GET['img'].'.thumb_'.$_GET['w'].'x'.$_GET['h'].'.gif');
				imagegif($tmp_img,$thumbnail);
				http_headers($thumbnail);
			}
			else
			{
				http_headers($_GET['img']);
			}
			imagegif($tmp_img);
		}
		elseif ($image[2] == 3 || $image[2] == 1)
		{
			if ($tn_server_cache)
			{
				$thumbnail = modify_tn_path($_GET['img'].'.thumb_'.$_GET['w'].'x'.$_GET['h'].'.png');
				imagepng($tmp_img,$thumbnail);
				http_headers($thumbnail);
			}
			else
			{
				http_headers($_GET['img']);
			}
			imagepng($tmp_img);
		}
		else
		{
			// Not an image or image...-function not supported
			// Let's output an error:
			http_headers();
		}

		// Clear the image from memory:
		imagedestroy($src);
		imagedestroy($tmp_img);
	}
?>