imagemanager.php

完美的在线教育系统

<?php
/**
 * ImageManager, list images, directories, and thumbnails.
 * @author $Author: Wei Zhuo $
 * @version $Id: ImageManager.php 27 2004-04-01 08:31:57Z Wei Zhuo $
 * @package ImageManager
 */

require_once('Files.php');

/**
 * ImageManager Class.
 * @author $Author: Wei Zhuo $
 * @version $Id: ImageManager.php 27 2004-04-01 08:31:57Z Wei Zhuo $
 */
class ImageManager 
{
	/**
	 * Configuration array.
	 */
	var $config;

	/**
	 * Array of directory information.
	 */
	var $dirs;

	/**
	 * Constructor. Create a new Image Manager instance.
	 * @param array $config configuration array, see config.inc.php
	 */
	function ImageManager($config) 
	{
		$this->config = $config;
	}

	/**
	 * Get the base directory.
	 * @return string base dir, see config.inc.php
	 */
	function getBaseDir() 
	{
		Return $this->config['base_dir'];
	}

	/**
	 * Get the base URL.
	 * @return string base url, see config.inc.php
	 */
	function getBaseURL() 
	{
		Return $this->config['base_url'];
	}

	function isValidBase()
	{
		return is_dir($this->getBaseDir());
	}

	/**
	 * Get the tmp file prefix.
     * @return string tmp file prefix.
	 */
	function getTmpPrefix() 
	{
		Return $this->config['tmp_prefix'];
	}

	/**
	 * Get the sub directories in the base dir.
	 * Each array element contain
	 * the relative path (relative to the base dir) as key and the 
	 * full path as value.
	 * @return array of sub directries
	 * <code>array('path name' => 'full directory path', ...)</code>
	 */
	function getDirs() 
	{
		if(is_null($this->dirs))
		{
			$dirs = $this->_dirs($this->getBaseDir(),'/');
			ksort($dirs);
			$this->dirs = $dirs;
		}
		return $this->dirs;
	}

	/**
	 * Recursively travese the directories to get a list
	 * of accessable directories.
	 * @param string $base the full path to the current directory
	 * @param string $path the relative path name
	 * @return array of accessiable sub-directories
	 * <code>array('path name' => 'full directory path', ...)</code>
	 */
	function _dirs($base, $path) 
	{
		$base = Files::fixPath($base);
		$dirs = array();

		if($this->isValidBase() == false)
			return $dirs;

		$d = @dir($base);
		
		while (false !== ($entry = $d->read())) 
		{
			//If it is a directory, and it doesn't start with
			// a dot, and if is it not the thumbnail directory
			if(is_dir($base.$entry) 
				&& substr($entry,0,1) != '.'
				&& $this->isThumbDir($entry) == false) 
			{
				$relative = Files::fixPath($path.$entry);
				$fullpath = Files::fixPath($base.$entry);
				$dirs[$relative] = $fullpath;
				$dirs = array_merge($dirs, $this->_dirs($fullpath, $relative));
			}
		}
		$d->close();

		Return $dirs;
	}

	/**
	 * Get all the files and directories of a relative path.
	 * @param string $path relative path to be base path.
	 * @return array of file and path information.
	 * <code>array(0=>array('relative'=>'fullpath',...), 1=>array('filename'=>fileinfo array(),...)</code>
	 * fileinfo array: <code>array('url'=>'full url', 
	 *                       'relative'=>'relative to base', 
	 *                        'fullpath'=>'full file path', 
	 *                        'image'=>imageInfo array() false if not image,
	 *                        'stat' => filestat)</code>
	 */
	function getFiles($path) 
	{
		$files = array();
		$dirs = array();

		if($this->isValidBase() == false)
			return array($files,$dirs);

		$path = Files::fixPath($path);
		$base = Files::fixPath($this->getBaseDir());
		$fullpath = Files::makePath($base,$path);


		$d = @dir($fullpath);
		
		while (false !== ($entry = $d->read())) 
		{
			//not a dot file or directory
			if(substr($entry,0,1) != '.')
			{
				if(is_dir($fullpath.$entry)
					&& $this->isThumbDir($entry) == false)
				{
					$relative = Files::fixPath($path.$entry);
					$full = Files::fixPath($fullpath.$entry);
					$count = $this->countFiles($full);
					$dirs[$relative] = array('fullpath'=>$full,'entry'=>$entry,'count'=>$count);
				}
				else if(is_file($fullpath.$entry) && $this->isThumb($entry)==false && $this->isTmpFile($entry) == false) 
				{
					$img = $this->getImageInfo($fullpath.$entry);

					if(!(!is_array($img)&&$this->config['validate_images']))
					{
						$file['url'] = Files::makePath($this->config['base_url'],$path).$entry;
						$file['relative'] = $path.$entry;
						$file['fullpath'] = $fullpath.$entry;
						$file['image'] = $img;
						$file['stat'] = stat($fullpath.$entry);
						$files[$entry] = $file;
					}
				}
			}
		}
		$d->close();
		ksort($dirs);
		ksort($files);
		
		Return array($dirs, $files);
	}	

	/**
	 * Count the number of files and directories in a given folder
	 * minus the thumbnail folders and thumbnails.
	 */
	function countFiles($path) 
	{
		$total = 0;

		if(is_dir($path)) 
		{
			$d = @dir($path);

			while (false !== ($entry = $d->read())) 
			{
				//echo $entry."<br>";
				if(substr($entry,0,1) != '.'
					&& $this->isThumbDir($entry) == false
					&& $this->isTmpFile($entry) == false
					&& $this->isThumb($entry) == false) 
				{
					$total++;
				}
			}
			$d->close();
		}
		return $total;
	}

	/**
	 * Get image size information.
	 * @param string $file the image file
	 * @return array of getImageSize information, 
	 *  false if the file is not an image.
	 */
	function getImageInfo($file) 
	{
		Return @getImageSize($file);
	}

	/**
	 * Check if the file contains the thumbnail prefix.
	 * @param string $file filename to be checked
	 * @return true if the file contains the thumbnail prefix, false otherwise.
	 */
	function isThumb($file) 
	{
		$len = strlen($this->config['thumbnail_prefix']);
		if(substr($file,0,$len)==$this->config['thumbnail_prefix'])
			Return true;
		else
			Return false;
	}

	/**
	 * Check if the given directory is a thumbnail directory.
	 * @param string $entry directory name
	 * @return true if it is a thumbnail directory, false otherwise
	 */
	function isThumbDir($entry) 
	{
		if($this->config['thumbnail_dir'] == false
			|| strlen(trim($this->config['thumbnail_dir'])) == 0)
			Return false;		
		else
			Return ($entry == $this->config['thumbnail_dir']);
	}

	/**
	 * Check if the given file is a tmp file.
	 * @param string $file file name
	 * @return boolean true if it is a tmp file, false otherwise
	 */
	function isTmpFile($file) 
	{
		$len = strlen($this->config['tmp_prefix']);
		if(substr($file,0,$len)==$this->config['tmp_prefix'])
			Return true;
		else
			Return false;	 	
	}

	/**
	 * For a given image file, get the respective thumbnail filename
	 * no file existence check is done.
	 * @param string $fullpathfile the full path to the image file
	 * @return string of the thumbnail file
	 */
	function getThumbName($fullpathfile) 
	{
		$path_parts = pathinfo($fullpathfile);
		
		$thumbnail = $this->config['thumbnail_prefix'].$path_parts['basename'];

		if($this->config['safe_mode'] == true
			|| strlen(trim($this->config['thumbnail_dir'])) == 0)
		{
			Return Files::makeFile($path_parts['dirname'],$thumbnail);
		}
		else
		{
			if(strlen(trim($this->config['thumbnail_dir'])) > 0)
			{
				$path = Files::makePath($path_parts['dirname'],$this->config['thumbnail_dir']);
				if(!is_dir($path))
					Files::createFolder($path);
				Return Files::makeFile($path,$thumbnail);
			}
			else //should this ever happen?
			{
				//error_log('ImageManager: Error in creating thumbnail name');
			}
		}
	}
	
	/**
	 * Similar to getThumbName, but returns the URL, base on the
	 * given base_url in config.inc.php
	 * @param string $relative the relative image file name, 
	 * relative to the base_dir path
	 * @return string the url of the thumbnail
	 */
	function getThumbURL($relative) 
	{
		$path_parts = pathinfo($relative);
		$thumbnail = $this->config['thumbnail_prefix'].$path_parts['basename'];
		if($path_parts['dirname']=='\\') $path_parts['dirname']='/';

		if($this->config['safe_mode'] == true
			|| strlen(trim($this->config['thumbnail_dir'])) == 0)
		{
			Return Files::makeFile($this->getBaseURL(),$thumbnail);
		}
		else
		{
			if(strlen(trim($this->config['thumbnail_dir'])) > 0)
			{
				$path = Files::makePath($path_parts['dirname'],$this->config['thumbnail_dir']);
				$url_path = Files::makePath($this->getBaseURL(), $path);
				Return Files::makeFile($url_path,$thumbnail);
			}
			else //should this ever happen?
			{
				//error_log('ImageManager: Error in creating thumbnail url');
			}

		}
	}

	/**
	 * Check if the given path is part of the subdirectories
	 * under the base_dir.
	 * @param string $path the relative path to be checked
	 * @return boolean true if the path exists, false otherwise
	 */
	function validRelativePath($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))
		{
			$upload_result=$this->_processFiles($relative, $_FILES['upload']);
			return $upload_result;
		}
	}
	
	/**
	 * Insert the uploaded picture in the database.
	 * @param string $relative The path in the document images folder
	 * @param array $file the uploaded file from $_FILES
	 * @param String $file_name the correct file name (generated by the function Files::copyFile).
	 */
	function _insertPictureInDatabase($relative, $file, $file_name){

		$image_name=utf8_decode($file_name);
		$image_name= strtr($image_name,"懒旅呐噌忏溴矣哉重蝮趱鲽壬仕栝觌晴掏蜗祉铒仝圮