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<?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){
if($size == ""){
$this->size = "original";
return;
}
$x = stripos($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){
$nameArray = explode('.', $this->name);
$ext = strtolower(end($nameArray));
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.")");
//Applying exif orientation rotation...
if (extension_loaded('exif') && function_exists('exif_read_data') && $ext == "jpg" && true)
$img = $this->applyExifOrientation($imagePath, $img);
return $img;
}
private function applyExifOrientation($imagePath, $img){
//FIXME: turning off all error messages is bad, but sadly it works :-/
// http://drupal.org/node/556970
// if we dont disable the errors, everytime someone want to view an image
// which is not in the cache, will not be displayed (but written to the cache)
// another idea: http://stackoverflow.com/questions/8106683/exif-read-data-incorrect-app1-exif-identifier-code
/* sadly it doesn't work right...
getimagesize($imagePath, $info);
echo "imageinfo: ".$info['APP1'];
var_dump($info);
if($info['APP1'] != 'Exif')
return $img;*/
$exif = @exif_read_data($imagePath);
if ($exif !== false){
if(array_key_exists("Orientation", $exif)){
/*
The comments in the switch are from the following bash command (the bash command isn't pretty but it works...)
$ for i in {1..8}; do exiftool -m -n -Orientation=$i 20111014_007.jpg|grep รค && rm *.jpg_original; exiftool -Orientation -n 20111014_007.jpg|sed 's/[ ]\+/ /g'; exiftool -Orientation 20111014_007.jpg|sed 's/[ ]\+/ /g'|cut -d " " -f3-;done
*/
//imagerotate rotates CCW
switch($exif["Orientation"]){
//Orientation : 1
//Horizontal (normal)
case 1: break;
//Orientation : 2
//Mirror horizontal
case 2: $img = $this->imageflip($img, true); break;
//Orientation : 3
//Rotate 180
case 3: $img = imagerotate($img, 180, 0); break;
//Orientation : 4
//Mirror vertical
case 4: $img = $this->imageflip($img, false, true); break;
//Orientation : 5
//Mirror horizontal and rotate 270 CW
case 5: $img = $this->imageflip($img, true); $img = imagerotate($img, 90, 0);break;
//Orientation : 6
//Rotate 90 CW
case 6: $img = imagerotate($img, 270, 0); break;
//Orientation : 7
//Mirror horizontal and rotate 90 CW
case 7: $img = $this->imageflip($img, true); $img = imagerotate($img, 270, 0); break;
//Orientation : 8
//Rotate 270 CW
case 8: $img = imagerotate($img, 90, 0); break;
}
}
}
return $img;
}
private function imageflip($img, $x, $y = false){
$size_x = imagesx($img);
$size_y = imagesy($img);
if($x)
imagecopyresampled($result, $img, 0, 0, ($size_x-1), 0, $size_x, $size_y, 0-$size_x, $size_y);
elseif($y)
imagecopyresampled($result, $img, 0, 0, 0, ($size_y-1), $size_x, $size_y, $size_x, 0-$size_y);
elseif($x && $y)
imagecopyresampled($result, $img, 0, 0, ($size_x-1), ($size_y-1), $size_x, $size_y, 0-$size_x, 0-$size_y);
else
$result = $img;
return $result;
}
private function createCacheFromImg($img){
if($this->size == "original"){
$this->saveImageToCache($img);
return;
}
# 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);
$nameArray = explode('.', $this->name);
$ext = strtolower(end($nameArray));
switch($ext){
case 'jpg':
case 'jpeg': imagejpeg($img, $imagePath, 80); break;
case 'png': imagepng($img, $imagePath, 9); break;
case 'gif': imagegif($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"];
if(array_key_exists("size", $_GET)){
$inSize = $_GET["size"];
}else{
$inSize = "";
}
//}
//FIXME: this is the lazy way (maybe a better way would be http://www.php.net/manual/en/function.exif-imagetype.php)...
//find imgtype:
$fileExt = substr($inName, strrpos($inName, '.'));
try{
$cImage = new cacheImage();
$img = $cImage->getImage($inPath, $inName, $inSize);
switch(strtolower($fileExt)){
case ".jpg":
case ".jpeg": header("Content-type: image/jpeg"); imagejpeg($img); break;
case ".png": header("Content-type: image/png"); imagepng($img); break;
case ".gif": header("Content-type: image/gif"); imagegif($img); break;
}
imagedestroy($img);
} catch (Exception $e) {
echo "something went wrong :-/\n";
}
?>