document.lib.php

完美的在线教育系统

<?php
/*
==============================================================================
	Dokeos - elearning and course management software
	
	Copyright (c) 2004-2008 Dokeos SPRL
	Copyright (c) 2003 Ghent University (UGent)
	Copyright (c) Roan Embrechts, Vrije Universiteit Brussel
	
	For a full list of contributors, see "credits.txt".
	The full license can be read in "license.txt".
	
	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.
	
	See the GNU General Public License for more details.
	
	Contact address: Dokeos, rue du Corbeau, 108, B-1030 Brussels, Belgium
	Mail: [e-mail]
==============================================================================
*/
/**
============================================================================== 
*	This is the document library for Dokeos.
*	It is / will be used to provide a service layer to all document-using tools.
*	and eliminate code duplication fro group documents, scorm documents, main documents.
*	Include/require it in your code to use its functionality.
*
*	@version 1.1, January 2005
*	@package dokeos.library
============================================================================== 
*/

/*
============================================================================== 
	DOCUMENTATION
	use the functions like this: DocumentManager::get_course_quota()
============================================================================== 
*/

/*
============================================================================== 
		CONSTANTS
============================================================================== 
*/

define("DISK_QUOTA_FIELD", "disk_quota"); //name of the database field
/** default quota for the course documents folder */
define("DEFAULT_DOCUMENT_QUOTA", get_setting('default_document_quotum'));

/*
============================================================================== 
		VARIABLES
============================================================================== 
*/

$sys_course_path = api_get_path(SYS_COURSE_PATH);
$baseServDir = api_get_path(SYS_PATH);
$baseServUrl = $_configuration['url_append']."/";
$baseWorkDir = $sys_course_path.(!empty($courseDir)?$courseDir:'');

/*
============================================================================== 
		DocumentManager CLASS
		the class and its functions
============================================================================== 
*/

/**
 *	@package dokeos.library
 */
class DocumentManager
{
	/**
	* @return the document folder quuta of the current course, in bytes
	* @todo eliminate globals
	*/
	function get_course_quota()
	{
		global $_course, $maxFilledSpace;
		$course_code = $_course['sysCode'];
		$course_table = Database :: get_main_table(TABLE_MAIN_COURSE);

		$sql_query = "SELECT `".DISK_QUOTA_FIELD."` FROM $course_table WHERE `code` = '$course_code'";
		$sql_result = api_sql_query($sql_query, __FILE__, __LINE__);
		$result = Database::fetch_array($sql_result);
		$course_quota = $result[DISK_QUOTA_FIELD];

		if ($course_quota == NULL)
		{
			//course table entry for quota was null
			//use default value
			$course_quota = DEFAULT_DOCUMENT_QUOTA;
		}

		return $course_quota;
	}

	/**
	*	Get the content type of a file by checking the extension
	*	We could use mime_content_type() with php-versions > 4.3,
	*	but this doesn't work as it should on Windows installations
	*
	*	@param string $filename or boolean TRUE to return complete array
	*	@author ? first version
	*	@author Bert Vanderkimpen
	*
	*/
	function file_get_mime_type($filename)
	{
		//all mime types in an array (from 1.6, this is the authorative source)
		//please keep this alphabetical if you add something to this list!!!
	    $mime_types=array(
			"ai" => "application/postscript",
			"aif" => "audio/x-aiff",
    		"aifc" => "audio/x-aiff",
   			"aiff" => "audio/x-aiff",
		    "asf" => "video/x-ms-asf",
		    "asc" => "text/plain",
		    "au" => "audio/basic",
		    "avi" => "video/x-msvideo",
		    "bcpio" => "application/x-bcpio",
		    "bin" => "application/octet-stream",
		    "bmp" => "image/bmp",
		    "cdf" => "application/x-netcdf",
		    "class" => "application/octet-stream",
		    "cpio" => "application/x-cpio",
		    "cpt" => "application/mac-compactpro",
		    "csh" => "application/x-csh",
		    "css" => "text/css",
		    "dcr" => "application/x-director",
		    "dir" => "application/x-director",
		    "djv" => "image/vnd.djvu",
		    "djvu" => "image/vnd.djvu",
		    "dll" => "application/octet-stream",
		    "dmg" => "application/x-diskcopy",
		    "dms" => "application/octet-stream",
		    "doc" => "application/msword",
		    "dvi" => "application/x-dvi",
		    "dwg" => "application/vnd.dwg",
		    "dxf" => "application/vnd.dxf",
		    "dxr" => "application/x-director",
		    "eps" => "application/postscript",
		    "etx" => "text/x-setext",
		    "exe" => "application/octet-stream",
		    "ez" => "application/andrew-inset",
		    "gif" => "image/gif",
		    "gtar" => "application/x-gtar",
		    "gz" => "application/x-gzip",    
		    "hdf" => "application/x-hdf",
		    "hqx" => "application/mac-binhex40",
		    "htm" => "text/html",
		    "html" => "text/html",
		    "ice" => "x-conference-xcooltalk",
		    "ief" => "image/ief",
		    "iges" => "model/iges",
		    "igs" => "model/iges",
		    "jar" => "application/java-archiver",
		    "jpe" => "image/jpeg",
		    "jpeg" => "image/jpeg",
		    "jpg" => "image/jpeg",
		    "js" => "application/x-javascript",
		    "kar" => "audio/midi",
		    "latex" => "application/x-latex",
		    "lha" => "application/octet-stream",
		    "lzh" => "application/octet-stream",
		    "m1a" => "audio/mpeg",
		    "m2a" => "audio/mpeg",
		    "m3u" => "audio/x-mpegurl",
		    "man" => "application/x-troff-man",
		    "me" => "application/x-troff-me",
		    "mesh" => "model/mesh",
		    "mid" => "audio/midi",
		    "midi" => "audio/midi",
		    "mov" => "video/quicktime",
		    "movie" => "video/x-sgi-movie",
		    "mp2" => "audio/mpeg",
		    "mp3" => "audio/mpeg",
		    "mp4" => "video/mpeg4-generic",
		    "mpa" => "audio/mpeg",
		    "mpe" => "video/mpeg",
		    "mpeg" => "video/mpeg",
		    "mpg" => "video/mpeg",
		    "mpga" => "audio/mpeg",
		    "ms" => "application/x-troff-ms",
		    "msh" => "model/mesh",
		    "mxu" => "video/vnd.mpegurl",
		    "nc" => "application/x-netcdf",
		    "oda" => "application/oda",
		    "pbm" => "image/x-portable-bitmap",
		    "pct" => "image/pict",
		    "pdb" => "chemical/x-pdb",
		    "pdf" => "application/pdf",
		    "pgm" => "image/x-portable-graymap",
		    "pgn" => "application/x-chess-pgn",
		    "pict" => "image/pict",
		    "png" => "image/png",
		    "pnm" => "image/x-portable-anymap",
		    "ppm" => "image/x-portable-pixmap",
		    "ppt" => "application/vnd.ms-powerpoint",
		    "pps" => "application/vnd.ms-powerpoint",
		    "ps" => "application/postscript",
		    "qt" => "video/quicktime",
		    "ra" => "audio/x-realaudio",
		    "ram" => "audio/x-pn-realaudio",
		    "rar" => "image/x-rar-compressed",
		    "ras" => "image/x-cmu-raster",
		    "rgb" => "image/x-rgb",
		    "rm" => "audio/x-pn-realaudio",
		    "roff" => "application/x-troff",
		    "rpm" => "audio/x-pn-realaudio-plugin",
		    "rtf" => "text/rtf",
		    "rtx" => "text/richtext",
		    "sgm" => "text/sgml",
		    "sgml" => "text/sgml",
		    "sh" => "application/x-sh",
		    "shar" => "application/x-shar",
		    "silo" => "model/mesh",
		    "sib" => "application/X-Sibelius-Score",
		    "sit" => "application/x-stuffit",
		    "skd" => "application/x-koan",
		    "skm" => "application/x-koan",
		    "skp" => "application/x-koan",
		    "skt" => "application/x-koan",
		    "smi" => "application/smil",
		    "smil" => "application/smil",
		    "snd" => "audio/basic",
		    "so" => "application/octet-stream",
		    "spl" => "application/x-futuresplash",
		    "src" => "application/x-wais-source",
		    "sv4cpio" => "application/x-sv4cpio",
		    "sv4crc" => "application/x-sv4crc",
		    "svf" => "application/vnd.svf",
		    "swf" => "application/x-shockwave-flash",
		    "sxc" => "application/vnd.sun.xml.calc",
		    "sxi" => "application/vnd.sun.xml.impress",
		    "sxw" => "application/vnd.sun.xml.writer",
		    "t" => "application/x-troff",
		    "tar" => "application/x-tar",
		    "tcl" => "application/x-tcl",
		    "tex" => "application/x-tex",
		    "texi" => "application/x-texinfo",
		    "texinfo" => "application/x-texinfo",
		    "tga" => "image/x-targa",
		    "tif" => "image/tif",
		    "tiff" => "image/tiff",
		    "tr" => "application/x-troff",
		    "tsv" => "text/tab-seperated-values",
		    "txt" => "text/plain",
		    "ustar" => "application/x-ustar",
		    "vcd" => "application/x-cdlink",
		    "vrml" => "model/vrml",
		    "wav" => "audio/x-wav",
		    "wbmp" => "image/vnd.wap.wbmp",
		    "wbxml" => "application/vnd.wap.wbxml",
		    "wml" => "text/vnd.wap.wml",
		    "wmlc" => "application/vnd.wap.wmlc",
		    "wmls" => "text/vnd.wap.wmlscript",
		    "wmlsc" => "application/vnd.wap.wmlscriptc",
		    "wma" => "video/x-ms-wma",   
		    "wmv" => "audio/x-ms-wmv",    
		    "wrl" => "model/vrml",
		    "xbm" => "image/x-xbitmap",
		    "xht" => "application/xhtml+xml",
		    "xhtml" => "application/xhtml+xml",
		    "xls" => "application/vnd.ms-excel",
		    "xml" => "text/xml",
		    "xpm" => "image/x-xpixmap",
		    "xsl" => "text/xml",
		    "xwd" => "image/x-windowdump",
		    "xyz" => "chemical/x-xyz",
		    "zip" => "application/zip"
		);
		
		if ($filename === TRUE) 
		{
			return $mime_types;
		}
		
		//get the extension of the file
		$extension = explode('.', $filename);

		//$filename will be an array if a . was found
		if (is_array($extension))
		{
			$extension = (strtolower($extension[sizeof($extension) - 1]));
		}
		//file without extension
		else
		{
			$extension = 'empty';