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<?php
namespace Gregwar\Captcha;
use Symfony\Component\Finder\Finder;
/**
* Handles actions related to captcha image files including saving and garbage collection
*
* @author Gregwar <g.passault@gmail.com>
* @author Jeremy Livingston <jeremy@quizzle.com>
*/
class ImageFileHandler
{
/**
* Name of folder for captcha images
* @var string
*/
protected $imageFolder;
/**
* Absolute path to public web folder
* @var string
*/
protected $webPath;
/**
* Frequency of garbage collection in fractions of 1
* @var int
*/
protected $gcFreq;
/**
* Maximum age of images in minutes
* @var int
*/
protected $expiration;
/**
* @param $imageFolder
* @param $webPath
* @param $gcFreq
* @param $expiration
*/
public function __construct($imageFolder, $webPath, $gcFreq, $expiration)
{
$this->imageFolder = $imageFolder;
$this->webPath = $webPath;
$this->gcFreq = $gcFreq;
$this->expiration = $expiration;
}
/**
* Saves the provided image content as a file
*
* @param string $contents
*
* @return string
*/
public function saveAsFile($contents)
{
$this->createFolderIfMissing();
$filename = md5(uniqid()) . '.jpg';
$filePath = $this->webPath . '/' . $this->imageFolder . '/' . $filename;
imagejpeg($contents, $filePath, 15);
return '/' . $this->imageFolder . '/' . $filename;
}
/**
* Randomly runs garbage collection on the image directory
*
* @return bool
*/
public function collectGarbage()
{
if (!mt_rand(1, $this->gcFreq) == 1) {
return false;
}
$this->createFolderIfMissing();
$finder = new Finder();
$criteria = sprintf('<= now - %s minutes', $this->expiration);
$finder->in($this->webPath . '/' . $this->imageFolder)
->date($criteria);
foreach($finder->files() as $file) {
unlink($file->getPathname());
}
return true;
}
/**
* Creates the folder if it doesn't exist
*/
protected function createFolderIfMissing()
{
if (!file_exists($this->webPath . '/' . $this->imageFolder)) {
mkdir($this->webPath . '/' . $this->imageFolder, 0755);
}
}
}
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