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Current File : /home/webpages/lima-city/tomlinde/html/gallpam/cachedImage.php

<?php
require_once 'internals/globalConstants.php';

/*requires 
sudo apt-get install php5-gd
a constant IMAGE_CACHE_PATH
a constant IMAGE_ORIGINAL_PATH
*/
class cacheImage {
	private $size;
	private $path;
	private $name;
	private $maxX;
	private $maxY;

	private function setSize($size){
		$x = stripos($size,"x");
		if($x <= 0)
			throw new Exception("Invalide size parameter (wrong X)");
		
		$firstNum = substr($size,0,$x);
		$secondNum = substr($size, $x+1);
		
		if(!is_numeric($firstNum) OR !is_numeric($secondNum))
			throw new Exception("Invalide size parameter (wrong number)");
		
		if(!file_exists(IMAGE_CACHE_PATH.$size) OR !is_dir(IMAGE_CACHE_PATH.$size))
			throw new Exception("Invalide size parameter (cache directory doesn't exist)");
		
		//its ok
		$this->size = $size;
		$this->maxX = $firstNum;
		$this->maxY = $secondNum;
	}
	private function setPath($path){
		if(stripos($path, "..") !== false)
			throw new Exception("Invalide path parameter (contains ..)");
		
		if(substr($path, strlen($path)-1) != "/")
			$path = $path."/";
		
		$this->path = $path;
	}
	private function setName($name){
		if(stripos($name, "..") == 0 AND stripos($name, "..") === true)
			throw new Exception("Invalide name parameter (contains .. at the beginning)");
		
		if(stripos($name, "/") !== false)
			throw new Exception("Invalide name parameter (contains /)");
		
		$this->name = $name;
	}
	private function imageExistsInCache(){
		return file_exists(IMAGE_CACHE_PATH.$this->size."/".$this->path.$this->name);
	}
	
	private function readImageFromPath($imagePath){
		$ext = strtolower(end(explode('.', $this->name)));
		switch($ext){
			case 'jpg':
			case 'jpeg': $img = imagecreatefromjpeg($imagePath); break;
			case 'png': $img = imagecreatefrompng($imagePath);break;
			case 'gif': $img = imagecreatefromgif($imagePath);break;
			default: throw new Exception("Invalide Image-Type");
		}
		
		if(!$img)
			throw new Exception("could not read the Image (".$imagePath.")");
		
		return $img;
	}
	private function createCacheFromImg($img){
		# Get image size and scale ratio
		$width = imagesx($img);
		$height = imagesy($img);
		$scale = min($this->maxX/$width, $this->maxY/$height);
		
		//we also do upscaling (since we care about this at an other point)
		$new_width = floor($scale*$width);
		$new_height = floor($scale*$height);

		# Create a new temporary image
		$new_img = imagecreatetruecolor($new_width, $new_height);

		# Copy and resize old image into new image
		imagecopyresized($new_img, $img, 0, 0, 0, 0,
				$new_width, $new_height, $width, $height);
		
		$this->saveImageToCache($new_img);
	}
	private function saveImageToCache($img){
		$imagePath = IMAGE_CACHE_PATH.$this->size."/".$this->path.$this->name;
		
		if(!file_exists(IMAGE_CACHE_PATH.$this->size."/".$this->path))
			mkdir(IMAGE_CACHE_PATH.$this->size."/".$this->path, 0777, true);
		
		$ext = strtolower(end(explode('.', $this->name)));
		switch($ext){
			case 'jpg':
			case 'jpeg': imagejpeg($img, $imagePath, 80); break;
			case 'png': imagepng($img, $imagePath, 80); break;
			case 'gif': imagegif($img, $imagePath); break;
			default: throw new Exception("Invalide Image-Type");
		}
	}
	
	public function getImage($inPath, $inName, $inSize){
		$this->setSize($inSize);
		$this->setName($inName);
		$this->setPath($inPath);
		
		if(!$this->imageExistsInCache()){
			$img = $this->readImageFromPath(IMAGE_ORIGINAL_PATH.$this->path.$this->name);
			if($this->maxX < imagesx($img) OR $this->maxY < imagesy($img)){
				$this->createCacheFromImg($img);
				imagedestroy($img);
				$img = $this->readImageFromPath(IMAGE_CACHE_PATH.$this->size."/".$this->path.$this->name);
			}
		} else
			$img = $this->readImageFromPath(IMAGE_CACHE_PATH.$this->size."/".$this->path.$this->name);
		
		return $img;
	}
};
/*$cli = true;
if($cli){
	$inPath = $argv['2'];
	$inName = $argv['3'];
	$inSize = $argv['4'];
} else {*/
	$inPath = $_GET["path"];
	$inName = $_GET["name"];
	$inSize = $_GET["size"];
//}

try{
	$cImage = new cacheImage();
	$img = $cImage->getImage($inPath, $inName, $inSize);
	header("Content-type: image/jpeg");
	imagejpeg($img);
} catch (Exception $e) {
	echo "something went wrong :-/\n";
}
?>

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