* @link http://www.pradosoft.com/
* @copyright Copyright © 2005 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Revision: $ $Date: $
* @package System.Web
*/
/**
* 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 as follows,
*
*
*
* 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
* @version $Revision: $ $Date: $
* @package System.Web
* @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();
/**
* @var boolean whether the module is initialized
*/
private $_initialized=false;
/**
* Initializes the module.
* This method is required by IModule and is invoked by application.
* @param TXmlElement module configuration
*/
public function init($config)
{
$application=$this->getApplication();
if($this->_basePath===null)
$this->_basePath=dirname($application->getRequest()->getApplicationFilePath()).'/'.self::DEFAULT_BASEPATH;
if(!is_writable($this->_basePath) || !is_dir($this->_basePath))
throw new TConfigurationException('assetmanager_basepath_invalid',$this->_basePath);
if($this->_baseUrl===null)
$this->_baseUrl=rtrim(dirname($application->getRequest()->getApplicationUrl()),'/\\').'/'.self::DEFAULT_BASEPATH;
$application->setAssetManager($this);
$this->_initialized=true;
}
/**
* @return string the root directory storing published asset files
*/
public function getBasePath()
{
return $this->_basePath;
}
/**
* Sets the root directory storing published asset files.
* The directory must be in namespace format.
* @param string the root directory storing published asset files
* @throws TInvalidOperationException if the module is initialized already
*/
public function setBasePath($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 $this->_baseUrl;
}
/**
* @param string the base url that the published asset files can be accessed
* @throws TInvalidOperationException if the module is initialized already
*/
public function setBaseUrl($value)
{
if($this->_initialized)
throw new TInvalidOperationException('assetmanager_baseurl_unchangeable');
else
$this->_baseUrl=rtrim($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.
* If the application is not in performance mode, the file modification
* time will be used to make sure the published file is latest or not.
* If not, a file copy will be performed.
* @param string the path to be published
* @param boolean If true, file modification time will be checked even if the application
* is in performance mode.
* @return string an absolute URL to the published directory
* @throw TInvalidDataValueException if the file path to be published is invalid
*/
public function publishFilePath($path,$checkTimestamp=false)
{
if(isset($this->_published[$path]))
return $this->_published[$path];
else if(($fullpath=realpath($path))===false)
throw new TInvalidDataValueException('assetmanager_filepath_invalid',$path);
else if(is_file($fullpath))
{
$dir=$this->hash(dirname($fullpath));
$fileName=basename($fullpath);
$dst=$this->_basePath.'/'.$dir;
if(!is_file($dst.'/'.$fileName) || $checkTimestamp || $this->getApplication()->getMode()!==TApplication::STATE_PERFORMANCE)
$this->copyFile($fullpath,$dst);
return $this->_published[$path]=$this->_baseUrl.'/'.$dir.'/'.$fileName;
}
else
{
$dir=$this->hash($fullpath);
if(!is_dir($this->_basePath.'/'.$dir) || $checkTimestamp || $this->getApplication()->getMode()!==TApplication::STATE_PERFORMANCE)
{
Prado::trace("Publishing directory $fullpath",'System.Web.UI.TAssetManager');
$this->copyDirectory($fullpath,$this->_basePath.'/'.$dir);
}
return $this->_published[$path]=$this->_baseUrl.'/'.$dir;
}
}
/**
* 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.
*/
protected function hash($dir)
{
return sprintf('%x',crc32($dir));
}
/**
* Copies a file to a directory.
* Copying is done only when the destination file does not exist
* or has an older file modification time.
* @param string source file path
* @param string destination directory (if not exists, it will be created)
*/
protected function copyFile($src,$dst)
{
if(!is_dir($dst))
@mkdir($dst);
$dstFile=$dst.'/'.basename($src);
if(@filemtime($dstFile)<@filemtime($src))
{
Prado::trace("Publishing file $src to $dstFile",'System.Web.TAssetManager');
@copy($src,$dstFile);
}
}
/**
* Copies a directory recursively as another.
* If the destination directory does not exist, it will be created.
* File modification time is used to ensure the copied files are latest.
* @param string the source directory
* @param string the destination directory
*/
protected function copyDirectory($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);
}
/**
* Publish a tar file by extracting its contents to the assets directory.
* Each tar file must be accomplished with its own MD5 check sum file.
* The MD5 file is published when the tar contents are successfully
* extracted to the assets directory. The presence of the MD5 file
* as published asset assumes that the tar file has already been extracted.
* @param string tar filename
* @param string MD5 checksum for the corresponding tar file.
* @return string URL path to the directory where the tar file was extracted.
*/
public function publishTarFile($tarfile, $md5sum, $checkTimestamp=false)
{
if(isset($this->_published[$md5sum]))
return $this->_published[$md5sum];
else if(($fullpath=realpath($md5sum))===false)
throw new TInvalidDataValueException('assetmanager_tarchecksum_invalid',$md5sum);
else
{
$dir=$this->hash(dirname($fullpath));
$fileName=basename($fullpath);
$dst=$this->_basePath.'/'.$dir;
if(!is_file($dst.'/'.$fileName) || $checkTimestamp || $this->getApplication()->getMode()!==TApplication::STATE_PERFORMANCE)
{
if(@filemtime($dst.'/'.$fileName)<@filemtime($fullpath))
{
$this->copyFile($fullpath,$dst);
$this->deployTarFile($tarfile,$dst);
}
}
return $this->_published[$md5sum]=$this->_baseUrl.'/'.$dir;
}
}
/**
* Extracts the tar file to the destination directory.
* N.B Tar file must not be compressed.
* @param string tar file
* @param string path where the contents of tar file are to be extracted
* @return boolean true if extract successful, false otherwise.
*/
protected function deployTarFile($path,$destination)
{
if(($fullpath=realpath($path))===false)
throw new TIOException('assetmanager_tarfile_invalid',$path);
else
{
Prado::using('System.Data.TTarFileExtractor');
$tar = new TTarFileExtractor($fullpath);
return $tar->extract($destination);
}
}
}
?>