imagemanager.php

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	 * @return boolean true if the path exists, false otherwise
	 */
	function validRelativePath($path) 
	{
		$dirs = $this->getDirs();
		if($path == '/')
			Return true;
		//check the path given in the url against the 
		//list of paths in the system.
		for($i = 0; $i < count($dirs); $i++)
		{
			$key = key($dirs);
			//we found the path
			if($key == $path)
				Return true;
		
			next($dirs);
		}		
		Return false;
	}

	/**
	 * Process uploaded files, assumes the file is in 
	 * $_FILES['upload'] and $_POST['dir'] is set.
	 * The dir must be relative to the base_dir and exists.
	 * If 'validate_images' is set to true, only file with
	 * image dimensions will be accepted.
	 * @return null
	 */
	function processUploads() 
	{
		if($this->isValidBase() == false)
			return;

		$relative = null;

		if(isset($_POST['dir'])) 
			$relative = rawurldecode($_POST['dir']);
		else
			return;

		//check for the file, and must have valid relative path
		if(isset($_FILES['upload']) && $this->validRelativePath($relative))
		{
			$this->_processFiles($relative, $_FILES['upload']);
		}
	}

	/**
	 * Process upload files. The file must be an 
	 * uploaded file. If 'validate_images' is set to
	 * true, only images will be processed. Any duplicate
	 * file will be renamed. See Files::copyFile for details
	 * on renaming.
	 * @param string $relative the relative path where the file
	 * should be copied to.
	 * @param array $file the uploaded file from $_FILES
	 * @return boolean true if the file was processed successfully, 
	 * false otherwise
	 */
	function _processFiles($relative, $file)
	{
		
		if($file['error']!=0)
		{
			Return false;
		}

		if(!is_file($file['tmp_name']))
		{
			Return false;
		}

		if(!is_uploaded_file($file['tmp_name']))
		{
			Files::delFile($file['tmp_name']);
			Return false;
		}
		

		if($this->config['validate_images'] == true)
		{
			$imgInfo = @getImageSize($file['tmp_name']);
			if(!is_array($imgInfo))
			{
				Files::delFile($file['tmp_name']);
				Return false;
			}
		}

		//now copy the file
		$path = Files::makePath($this->getBaseDir(),$relative);
		$result = Files::copyFile($file['tmp_name'], $path, $file['name']);

		//no copy error
		if(!is_int($result))
		{
			Files::delFile($file['tmp_name']);
			Return true;
		}

		//delete tmp files.
		Files::delFile($file['tmp_name']);
		Return false;
	}

	/**
	 * Get the URL of the relative file.
	 * basically appends the relative file to the 
	 * base_url given in config.inc.php
	 * @param string $relative a file the relative to the base_dir
	 * @return string the URL of the relative file.
	 */
	function getFileURL($relative) 
	{
		Return Files::makeFile($this->getBaseURL(),$relative);
	}

	/**
	 * Get the fullpath to a relative file.
	 * @param string $relative the relative file.
	 * @return string the full path, .ie. the base_dir + relative.
	 */
	function getFullPath($relative) 
	{
		Return Files::makeFile($this->getBaseDir(),$relative);;
	}

	/**
	 * Get the default thumbnail.
	 * @return string default thumbnail, empty string if 
	 * the thumbnail doesn't exist.
	 */
	function getDefaultThumb() 
	{
		if(is_file($this->config['default_thumbnail']))
			Return $this->config['default_thumbnail'];
		else 
			Return '';
	}


	/**
	 * Get the thumbnail url to be displayed. 
	 * If the thumbnail exists, and it is up-to-date
	 * the thumbnail url will be returns. If the 
	 * file is not an image, a default image will be returned.
	 * If it is an image file, and no thumbnail exists or 
	 * the thumbnail is out-of-date (i.e. the thumbnail 
	 * modified time is less than the original file)
	 * then a thumbs.php?img=filename.jpg is returned.
	 * The thumbs.php url will generate a new thumbnail
	 * on the fly. If the image is less than the dimensions
	 * of the thumbnails, the image will be display instead.
	 * @param string $relative the relative image file.
	 * @return string the url of the thumbnail, be it
	 * actually thumbnail or a script to generate the
	 * thumbnail on the fly.
	 */
	function getThumbnail($relative) 
	{
		$fullpath = Files::makeFile($this->getBaseDir(),$relative);

		//not a file???
		if(!is_file($fullpath))
			Return $this->getDefaultThumb();

		$imgInfo = @getImageSize($fullpath);
		
		//not an image
		if(!is_array($imgInfo))
			Return $this->getDefaultThumb();

		//the original image is smaller than thumbnails,
		//so just return the url to the original image.
		if ($imgInfo[0] <= $this->config['thumbnail_width']
		 && $imgInfo[1] <= $this->config['thumbnail_height'])
			Return $this->getFileURL($relative);

		$thumbnail = $this->getThumbName($fullpath);
		
		//check for thumbnails, if exists and
		// it is up-to-date, return the thumbnail url
		if(is_file($thumbnail))
		{
			if(filemtime($thumbnail) >= filemtime($fullpath))
				Return $this->getThumbURL($relative);
		}

		//well, no thumbnail was found, so ask the thumbs.php
		//to generate the thumbnail on the fly.
		Return 'thumbs.php?img='.rawurlencode($relative);
	}

	/**
	 * Delete and specified files.
	 * @return boolean true if delete, false otherwise
	 */
	function deleteFiles() 
	{
		if(isset($_GET['delf']))
			$this->_delFile(rawurldecode($_GET['delf']));
	}

	/**
	 * Delete and specified directories.
	 * @return boolean true if delete, false otherwise
	 */
	function deleteDirs() 
	{
		 if(isset($_GET['deld']))
			return $this->_delDir(rawurldecode($_GET['deld']));		
		 else
			 Return false;
	}

	/**
	 * Delete the relative file, and any thumbnails.
	 * @param string $relative the relative file.
	 * @return boolean true if deleted, false otherwise.
	 */
	function _delFile($relative) 
	{
		$fullpath = Files::makeFile($this->getBaseDir(),$relative);
		
		//check that the file is an image
		if($this->config['validate_images'] == true)
		{
			if(!is_array($this->getImageInfo($fullpath)))
				return false; //hmmm not an Image!!???
		}

		$thumbnail = $this->getThumbName($fullpath);

		if(Files::delFile($fullpath))
			Return Files::delFile($thumbnail);
		else
			Return false;
	}

	/**
	 * Delete directories recursively.
	 * @param string $relative the relative path to be deleted.
	 * @return boolean true if deleted, false otherwise.
	 */
	function _delDir($relative) 
	{
		$fullpath = Files::makePath($this->getBaseDir(),$relative);
		if($this->countFiles($fullpath) <= 0)
			return Files::delFolder($fullpath,true); //delete recursively.
		else
			Return false;
	}

	/**
	 * Create new directories.
	 * If in safe_mode, nothing happens.
	 * @return boolean true if created, false otherwise.
	 */
	function processNewDir() 
	{
		if($this->config['safe_mode'] == true)
			Return false;

		if(isset($_GET['newDir']) && isset($_GET['dir']))
		{
			$newDir = rawurldecode($_GET['newDir']);
			$dir = rawurldecode($_GET['dir']);
			$path = Files::makePath($this->getBaseDir(),$dir);
			$fullpath = Files::makePath($path, Files::escape($newDir));
			if(is_dir($fullpath))
				Return false;

			Return Files::createFolder($fullpath);
		}
	}

	/**
	 * Do some graphic library method checkings
	 * @param string $library the graphics library, GD, NetPBM, or IM.
	 * @param string $method the method to check.
	 * @return boolean true if able, false otherwise.
	 */
	function validGraphicMethods($library,$method)
	{
		switch ($library)
		{
			case 'GD':
				return $this->_checkGDLibrary($method);
				break;
			case 'NetPBM':
				return $this->_checkNetPBMLibrary($method);
				break;
			case 'IM':
				return $this->_checkIMLibrary($method);
		}
		return false;
	}

	function _checkIMLibrary($method)
	{
		//ImageMagick goes throught 1 single executable
		if(is_file(Files::fixPath(IMAGE_TRANSFORM_LIB_PATH).'convert'))
			return true;
		else
			return false;
	}

	/**
	 * Check the GD library functionality.
	 * @param string $library the graphics library, GD, NetPBM, or IM.
	 * @return boolean true if able, false otherwise.
	 */
	function _checkGDLibrary($method)
	{
		$errors = array();
		switch($method)
		{
			case 'create':
				$errors['createjpeg'] = function_exists('imagecreatefromjpeg');
				$errors['creategif'] = function_exists('imagecreatefromgif');
				$errors['createpng'] = function_exists('imagecreatefrompng');
				break;
			case 'modify':
				$errors['create'] = function_exists('ImageCreateTrueColor') || function_exists('ImageCreate');
				$errors['copy'] = function_exists('ImageCopyResampled') || function_exists('ImageCopyResized');
				break;
			case 'save':
				$errors['savejpeg'] = function_exists('imagejpeg');
				$errors['savegif'] = function_exists('imagegif');
				$errors['savepng'] = function_exists('imagepng');
				break;
		}

		return $errors;
	}
}