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<?php
/**
* TAssetManager class
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Revision: $ $Date: $
* @package System.Web.UI
*/
/**
* TAssetManager class
*
* TAssetManager provides a scheme to allow web clients visiting
* private files that are normally web-inaccessible.
*
* TAssetManager will copy the file to be published into a web-accessible
* directory. The default base directory for storing the file is "assets", which
* should be under the application directory. This can be changed by setting
* the {@link setBasePath BasePath} property together with the
* {@link setBaseUrl BaseUrl} property that refers to the URL for accessing the base path.
*
* By default, TAssetManager will not publish a file or directory if it already
* exists in the publishing directory and has an older modification time.
* If the application mode is set as 'Performance', the modification time check
* will be skipped. You can explicitly require a modification time check
* with the function {@link publishFilePath}. This is usually
* very useful during development.
*
* TAssetManager may be configured in application configuration file within
* page service element as follows,
* <module id="asset" BasePath="Application.assets" BaseUrl="/assets" />
* where {@link getBasePath BasePath} and {@link getBaseUrl BaseUrl} are
* configurable properties of TAssetManager. Make sure that BasePath is a namespace
* pointing to a valid directory writable by the Web server process.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Revision: $ $Date: $
* @package System.Web.UI
* @since 3.0
*/
class TAssetManager extends TModule
{
/**
* Default web accessible base path for storing private files
*/
const DEFAULT_BASEPATH='assets';
/**
* @var string base web accessible path for storing private files
*/
private $_basePath=null;
/**
* @var string base URL for accessing the publishing directory.
*/
private $_baseUrl=null;
/**
* @var boolean whether to use timestamp checking to ensure files are published with up-to-date versions.
*/
private $_checkTimestamp=false;
/**
* @var TApplication application instance
*/
private $_application;
/**
* @var array published assets
*/
private $_published=array();
/**
* Initializes the module.
* This method is required by IModule and is invoked by application.
* @param TXmlElement module configuration
*/
public function init($config=null)
{
parent::init($config);
$application=$this->getApplication();
if($this->_basePath===null)
$this->_basePath=dirname($application->getRequest()->getPhysicalApplicationPath()).'/'.self::DEFAULT_BASEPATH;
if(!is_writable($this->_basePath) || !is_dir($this->_basePath))
throw new TConfigurationException('assetmanager_basepath_invalid',$this->_basePath);
if($this->_baseUrl===null)
$this->_baseUrl=dirname($application->getRequest()->getApplicationPath()).'/'.self::DEFAULT_BASEPATH;
$application->getService()->setAssetManager($this);
}
/**
* @return string the root directory storing published asset files
*/
public function getBasePath()
{
return $this->_basePath;
}
/**
* Sets the root directory storing published asset files.
* The directory must be in namespace format.
* @param string the root directory storing published asset files
* @throws TInvalidOperationException if the service is initialized already
*/
public function setBasePath($value)
{
if($this->_initialized)
throw new TInvalidOperationException('assetmanager_basepath_unchangeable');
else
{
$this->_basePath=Prado::getPathOfAlias($value);
if($this->_basePath===null || !is_dir($this->_basePath) || !is_writable($this->_basePath))
throw new TInvalidDataValueException('assetmanage_basepath_invalid',$value);
}
}
/**
* @return string the base url that the published asset files can be accessed
*/
public function getBaseUrl()
{
return $this->_baseUrl;
}
/**
* @param string the base url that the published asset files can be accessed
* @throws TInvalidOperationException if the service is initialized already
*/
public function setBaseUrl($value)
{
if($this->_initialized)
throw new TInvalidOperationException('assetmanager_baseurl_unchangeable');
else
$this->_baseUrl=$value;
}
/**
* Publishes a file or a directory (recursively).
* This method will copy the content in a directory (recursively) to
* a web accessible directory and returns the URL for the directory.
* @param string the path to be published
* @param boolean whether to use file modify time to ensure every published file is latest
* @return string an absolute URL to the published directory
*/
public function publishFilePath($path,$checkTimestamp=false)
{
if(isset($this->_published[$path]))
return $this->_published[$path];
else if(($fullpath=realpath($path))===false)
return '';
else if(is_file($fullpath))
{
$dir=$this->hash(dirname($fullpath));
$file=$this->_basePath.'/'.$dir.'/'.basename($fullpath);
if(!is_file($file) || $checkTimestamp || $this->getApplication()->getMode()!==TApplication::STATE_PERFORMANCE)
{
if(!is_dir($this->_basePath.'/'.$dir))
@mkdir($this->_basePath.'/'.$dir);
if(!is_file($file) || @filemtime($file)<@filemtime($fullpath))
@copy($fullpath,$file);
}
$this->_published[$path]=$this->_baseUrl.'/'.$dir.'/'.basename($fullpath);
return $this->_published[$path];
}
else
{
$dir=$this->hash($fullpath);
if(!is_dir($this->_basePath.'/'.$dir) || $checkTimestamp || $this->getApplication()->getMode()!==TApplication::STATE_PERFORMANCE)
$this->copyDirectory($fullpath,$this->_basePath.'/'.$dir);
$this->_published[$path]=$this->_baseUrl.'/'.$dir;
return $this->_published[$path];
}
}
/**
* Generate a CRC32 hash for the directory path. Collisions are higher
* than MD5 but generates a much smaller hash string.
* @param string string to be hashed.
* @return string hashed string.
*/
private function hash($dir)
{
return sprintf('%x',crc32($dir));
}
/**
* Copies a directory recursively as another.
* If the destination directory does not exist, it will be created.
* File modification time is used to ensure the copied files are latest.
* @param string the source directory
* @param string the destination directory
*/
protected function copyDirectory($src,$dst)
{
if(!is_dir($dst))
@mkdir($dst);
$folder=@opendir($src);
while($file=@readdir($folder))
{
if($file==='.' || $file==='..')
continue;
else if(is_file($src.'/'.$file))
{
if(@filemtime($dst.'/'.$file)<@filemtime($src.'/'.$file))
@copy($src.'/'.$file,$dst.'/'.$file);
}
else
$this->copyDirectory($src.'/'.$file,$dst.'/'.$file);
}
closedir($folder);
}
}
?>
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