lib/filelib.php

   1 <?php //$Id$
   2
   3 require_once($CFG->libdir.'/libcurlemu/libcurlemu.inc.php'); // might be moved to setup.php later
   4
   5 define('BYTESERVING_BOUNDARY', 's1k2o3d4a5k6s7'); //unique string constant
   6
   7 /**
   8  * Fetches content of file from Internet (using proxy if defined).
   9  *
  10  * @return mixed false if request failed or content of the file as string if ok.
  11  */
  12 function download_file_content($url) {
  13     $ch = curl_init($url);
  14     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  15     curl_setopt($ch, CURLOPT_HEADER, false);
  16     if (!empty($CFG->proxyhost)) {
  17         curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, true);
  18         if (empty($CFG->proxyport)) {
  19             curl_setopt($ch, CURLOPT_PROXY, $CFG->proxy);
  20         } else {
  21             curl_setopt($ch, CURLOPT_PROXY, $CFG->proxy.':'.$CFG->proxyport);
  22         }
  23         if(!empty($CFG->proxyuser) and !empty($CFG->proxypassword)) {
  24             curl_setopt($ch, CURLOPT_PROXYUSERPWD, $CFG->proxyuser.':'.$CFG->proxypassword);
  25         }
  26     }
  27     $result = curl_exec($ch);
  28     curl_close($ch);
  29     return $result;
  30 }
  31
  32 /**
  33  * @return List of information about file types based on extensions.
  34  *   Associative array of extension (lower-case) to associative array
  35  *   from 'element name' to data. Current element names are 'type' and 'icon'.
  36  *   Unknown types should use the 'xxx' entry which includes defaults.
  37  */
  38 function get_mimetypes_array() {
  39     return array (
  40         'xxx'  => array ('type'=>'document/unknown', 'icon'=>'unknown.gif'),
  41         '3gp'  => array ('type'=>'video/quicktime', 'icon'=>'video.gif'),
  42         'ai'   => array ('type'=>'application/postscript', 'icon'=>'image.gif'),
  43         'aif'  => array ('type'=>'audio/x-aiff', 'icon'=>'audio.gif'),
  44         'aiff' => array ('type'=>'audio/x-aiff', 'icon'=>'audio.gif'),
  45         'aifc' => array ('type'=>'audio/x-aiff', 'icon'=>'audio.gif'),
  46         'applescript'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  47         'asc'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  48         'asm'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  49         'au'   => array ('type'=>'audio/au', 'icon'=>'audio.gif'),
  50         'avi'  => array ('type'=>'video/x-ms-wm', 'icon'=>'avi.gif'),
  51         'bmp'  => array ('type'=>'image/bmp', 'icon'=>'image.gif'),
  52         'c'    => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  53         'cct'  => array ('type'=>'shockwave/director', 'icon'=>'flash.gif'),
  54         'cpp'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  55         'cs'   => array ('type'=>'application/x-csh', 'icon'=>'text.gif'),
  56         'css'  => array ('type'=>'text/css', 'icon'=>'text.gif'),
  57         'csv'  => array ('type'=>'text/csv', 'icon'=>'excel.gif'),
  58         'dv'   => array ('type'=>'video/x-dv', 'icon'=>'video.gif'),
  59         'dmg'  => array ('type'=>'application/octet-stream', 'icon'=>'dmg.gif'),
  60         'doc'  => array ('type'=>'application/msword', 'icon'=>'word.gif'),
  61         'dcr'  => array ('type'=>'application/x-director', 'icon'=>'flash.gif'),
  62         'dif'  => array ('type'=>'video/x-dv', 'icon'=>'video.gif'),
  63         'dir'  => array ('type'=>'application/x-director', 'icon'=>'flash.gif'),
  64         'dxr'  => array ('type'=>'application/x-director', 'icon'=>'flash.gif'),
  65         'eps'  => array ('type'=>'application/postscript', 'icon'=>'pdf.gif'),
  66         'fdf'  => array ('type'=>'application/pdf', 'icon'=>'pdf.gif'),
  67         'flv'  => array ('type'=>'video/x-flv', 'icon'=>'video.gif'),
  68         'gif'  => array ('type'=>'image/gif', 'icon'=>'image.gif'),
  69         'gtar' => array ('type'=>'application/x-gtar', 'icon'=>'zip.gif'),
  70         'tgz'  => array ('type'=>'application/g-zip', 'icon'=>'zip.gif'),
  71         'gz'   => array ('type'=>'application/g-zip', 'icon'=>'zip.gif'),
  72         'gzip' => array ('type'=>'application/g-zip', 'icon'=>'zip.gif'),
  73         'h'    => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  74         'hpp'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  75         'hqx'  => array ('type'=>'application/mac-binhex40', 'icon'=>'zip.gif'),
  76         'htc'  => array ('type'=>'text/x-component', 'icon'=>'text.gif'),
  77         'html' => array ('type'=>'text/html', 'icon'=>'html.gif'),
  78         'xhtml'=> array ('type'=>'application/xhtml+xml', 'icon'=>'html.gif'),
  79         'htm'  => array ('type'=>'text/html', 'icon'=>'html.gif'),
  80         'ico'  => array ('type'=>'image/vnd.microsoft.icon', 'icon'=>'image.gif'),
  81         'isf'  => array ('type'=>'application/inspiration', 'icon'=>'isf.gif'),
  82         'ist'  => array ('type'=>'application/inspiration.template', 'icon'=>'isf.gif'),
  83         'java' => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  84         'jcb'  => array ('type'=>'text/xml', 'icon'=>'jcb.gif'),
  85         'jcl'  => array ('type'=>'text/xml', 'icon'=>'jcl.gif'),
  86         'jcw'  => array ('type'=>'text/xml', 'icon'=>'jcw.gif'),
  87         'jmt'  => array ('type'=>'text/xml', 'icon'=>'jmt.gif'),
  88         'jmx'  => array ('type'=>'text/xml', 'icon'=>'jmx.gif'),
  89         'jpe'  => array ('type'=>'image/jpeg', 'icon'=>'image.gif'),
  90         'jpeg' => array ('type'=>'image/jpeg', 'icon'=>'image.gif'),
  91         'jpg'  => array ('type'=>'image/jpeg', 'icon'=>'image.gif'),
  92         'jqz'  => array ('type'=>'text/xml', 'icon'=>'jqz.gif'),
  93         'js'   => array ('type'=>'application/x-javascript', 'icon'=>'text.gif'),
  94         'latex'=> array ('type'=>'application/x-latex', 'icon'=>'text.gif'),
  95         'm'    => array ('type'=>'text/plain', 'icon'=>'text.gif'),
  96         'mov'  => array ('type'=>'video/quicktime', 'icon'=>'video.gif'),
  97         'movie'=> array ('type'=>'video/x-sgi-movie', 'icon'=>'video.gif'),
  98         'm3u'  => array ('type'=>'audio/x-mpegurl', 'icon'=>'audio.gif'),
  99         'mp3'  => array ('type'=>'audio/mp3', 'icon'=>'audio.gif'),
 100         'mp4'  => array ('type'=>'video/mp4', 'icon'=>'video.gif'),
 101         'mpeg' => array ('type'=>'video/mpeg', 'icon'=>'video.gif'),
 102         'mpe'  => array ('type'=>'video/mpeg', 'icon'=>'video.gif'),
 103         'mpg'  => array ('type'=>'video/mpeg', 'icon'=>'video.gif'),
 104
 105         'odt'  => array ('type'=>'application/vnd.oasis.opendocument.text', 'icon'=>'odt.gif'),
 106         'ott'  => array ('type'=>'application/vnd.oasis.opendocument.text-template', 'icon'=>'odt.gif'),
 107         'oth'  => array ('type'=>'application/vnd.oasis.opendocument.text-web', 'icon'=>'odt.gif'),
 108         'odm'  => array ('type'=>'application/vnd.oasis.opendocument.text-master', 'icon'=>'odm.gif'),
 109         'odg'  => array ('type'=>'application/vnd.oasis.opendocument.graphics', 'icon'=>'odg.gif'),
 110         'otg'  => array ('type'=>'application/vnd.oasis.opendocument.graphics-template', 'icon'=>'odg.gif'),
 111         'odp'  => array ('type'=>'application/vnd.oasis.opendocument.presentation', 'icon'=>'odp.gif'),
 112         'otp'  => array ('type'=>'application/vnd.oasis.opendocument.presentation-template', 'icon'=>'odp.gif'),
 113         'ods'  => array ('type'=>'application/vnd.oasis.opendocument.spreadsheet', 'icon'=>'ods.gif'),
 114         'ots'  => array ('type'=>'application/vnd.oasis.opendocument.spreadsheet-template', 'icon'=>'ods.gif'),
 115         'odc'  => array ('type'=>'application/vnd.oasis.opendocument.chart', 'icon'=>'odc.gif'),
 116         'odf'  => array ('type'=>'application/vnd.oasis.opendocument.formula', 'icon'=>'odf.gif'),
 117         'odb'  => array ('type'=>'application/vnd.oasis.opendocument.database', 'icon'=>'odb.gif'),
 118         'odi'  => array ('type'=>'application/vnd.oasis.opendocument.image', 'icon'=>'odi.gif'),
 119
 120         'pct'  => array ('type'=>'image/pict', 'icon'=>'image.gif'),
 121         'pdf'  => array ('type'=>'application/pdf', 'icon'=>'pdf.gif'),
 122         'php'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
 123         'pic'  => array ('type'=>'image/pict', 'icon'=>'image.gif'),
 124         'pict' => array ('type'=>'image/pict', 'icon'=>'image.gif'),
 125         'png'  => array ('type'=>'image/png', 'icon'=>'image.gif'),
 126         'pps'  => array ('type'=>'application/vnd.ms-powerpoint', 'icon'=>'powerpoint.gif'),
 127         'ppt'  => array ('type'=>'application/vnd.ms-powerpoint', 'icon'=>'powerpoint.gif'),
 128         'ps'   => array ('type'=>'application/postscript', 'icon'=>'pdf.gif'),
 129         'qt'   => array ('type'=>'video/quicktime', 'icon'=>'video.gif'),
 130         'ra'   => array ('type'=>'audio/x-realaudio', 'icon'=>'audio.gif'),
 131         'ram'  => array ('type'=>'audio/x-pn-realaudio', 'icon'=>'audio.gif'),
 132         'rhb'  => array ('type'=>'text/xml', 'icon'=>'xml.gif'),
 133         'rm'   => array ('type'=>'audio/x-pn-realaudio', 'icon'=>'audio.gif'),
 134         'rtf'  => array ('type'=>'text/rtf', 'icon'=>'text.gif'),
 135         'rtx'  => array ('type'=>'text/richtext', 'icon'=>'text.gif'),
 136         'sh'   => array ('type'=>'application/x-sh', 'icon'=>'text.gif'),
 137         'sit'  => array ('type'=>'application/x-stuffit', 'icon'=>'zip.gif'),
 138         'smi'  => array ('type'=>'application/smil', 'icon'=>'text.gif'),
 139         'smil' => array ('type'=>'application/smil', 'icon'=>'text.gif'),
 140         'sqt'  => array ('type'=>'text/xml', 'icon'=>'xml.gif'),
 141         'svg'  => array ('type'=>'image/svg+xml', 'icon'=>'image.gif'),
 142         'svgz' => array ('type'=>'image/svg+xml', 'icon'=>'image.gif'),
 143         'swa'  => array ('type'=>'application/x-director', 'icon'=>'flash.gif'),
 144         'swf'  => array ('type'=>'application/x-shockwave-flash', 'icon'=>'flash.gif'),
 145         'swfl' => array ('type'=>'application/x-shockwave-flash', 'icon'=>'flash.gif'),
 146
 147         'sxw'  => array ('type'=>'application/vnd.sun.xml.writer', 'icon'=>'odt.gif'),
 148         'stw'  => array ('type'=>'application/vnd.sun.xml.writer.template', 'icon'=>'odt.gif'),
 149         'sxc'  => array ('type'=>'application/vnd.sun.xml.calc', 'icon'=>'odt.gif'),
 150         'stc'  => array ('type'=>'application/vnd.sun.xml.calc.template', 'icon'=>'odt.gif'),
 151         'sxd'  => array ('type'=>'application/vnd.sun.xml.draw', 'icon'=>'odt.gif'),
 152         'std'  => array ('type'=>'application/vnd.sun.xml.draw.template', 'icon'=>'odt.gif'),
 153         'sxi'  => array ('type'=>'application/vnd.sun.xml.impress', 'icon'=>'odt.gif'),
 154         'sti'  => array ('type'=>'application/vnd.sun.xml.impress.template', 'icon'=>'odt.gif'),
 155         'sxg'  => array ('type'=>'application/vnd.sun.xml.writer.global', 'icon'=>'odt.gif'),
 156         'sxm'  => array ('type'=>'application/vnd.sun.xml.math', 'icon'=>'odt.gif'),
 157
 158         'tar'  => array ('type'=>'application/x-tar', 'icon'=>'zip.gif'),
 159         'tif'  => array ('type'=>'image/tiff', 'icon'=>'image.gif'),
 160         'tiff' => array ('type'=>'image/tiff', 'icon'=>'image.gif'),
 161         'tex'  => array ('type'=>'application/x-tex', 'icon'=>'text.gif'),
 162         'texi' => array ('type'=>'application/x-texinfo', 'icon'=>'text.gif'),
 163         'texinfo'  => array ('type'=>'application/x-texinfo', 'icon'=>'text.gif'),
 164         'tsv'  => array ('type'=>'text/tab-separated-values', 'icon'=>'text.gif'),
 165         'txt'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
 166         'wav'  => array ('type'=>'audio/wav', 'icon'=>'audio.gif'),
 167         'wmv'  => array ('type'=>'video/x-ms-wmv', 'icon'=>'avi.gif'),
 168         'asf'  => array ('type'=>'video/x-ms-asf', 'icon'=>'avi.gif'),
 169         'xdp'  => array ('type'=>'application/pdf', 'icon'=>'pdf.gif'),
 170         'xfd'  => array ('type'=>'application/pdf', 'icon'=>'pdf.gif'),
 171         'xfdf' => array ('type'=>'application/pdf', 'icon'=>'pdf.gif'),
 172         'xls'  => array ('type'=>'application/vnd.ms-excel', 'icon'=>'excel.gif'),
 173         'xml'  => array ('type'=>'application/xml', 'icon'=>'xml.gif'),
 174         'xsl'  => array ('type'=>'text/xml', 'icon'=>'xml.gif'),
 175         'zip'  => array ('type'=>'application/zip', 'icon'=>'zip.gif')
 176     );
 177 }
 178
 179 /**
 180  * Obtains information about a filetype based on its extension. Will
 181  * use a default if no information is present about that particular
 182  * extension.
 183  * @param string $element Desired information (usually 'icon'
 184  *   for icon filename or 'type' for MIME type)
 185  * @param string $filename Filename we're looking up
 186  * @return string Requested piece of information from array
 187  */
 188 function mimeinfo($element, $filename) {
 189     static $mimeinfo;
 190     $mimeinfo=get_mimetypes_array();
 191
 192     if (eregi('\.([a-z0-9]+)$', $filename, $match)) {
 193         if (isset($mimeinfo[strtolower($match[1])][$element])) {
 194             return $mimeinfo[strtolower($match[1])][$element];
 195         } else {
 196             return $mimeinfo['xxx'][$element];   // By default
 197         }
 198     } else {
 199         return $mimeinfo['xxx'][$element];   // By default
 200     }
 201 }
 202
 203 /**
 204  * Obtains information about a filetype based on the MIME type rather than
 205  * the other way around.
 206  * @param string $element Desired information (usually 'icon')
 207  * @param string $mimetype MIME type we're looking up
 208  * @return string Requested piece of information from array
 209  */
 210 function mimeinfo_from_type($element, $mimetype) {
 211     static $mimeinfo;
 212     $mimeinfo=get_mimetypes_array();
 213
 214     foreach($mimeinfo as $values) {
 215         if($values['type']==$mimetype) {
 216             if(isset($values[$element])) {
 217                 return $values[$element];
 218             }
 219             break;
 220         }
 221     }
 222     return $mimeinfo['xxx'][$element]; // Default
 223 }
 224
 225 /**
 226  * Obtains descriptions for file types (e.g. 'Microsoft Word document') from the
 227  * mimetypes.php language file.
 228  * @param string $mimetype MIME type (can be obtained using the mimeinfo function)
 229  * @param bool $capitalise If true, capitalises first character of result
 230  * @return string Text description
 231  */
 232 function get_mimetype_description($mimetype,$capitalise=false) {
 233     $result=get_string($mimetype,'mimetypes');
 234     // Surrounded by square brackets indicates that there isn't a string for that
 235     // (maybe there is a better way to find this out?)
 236     if(strpos($result,'[')===0) {
 237         $result=get_string('document/unknown','mimetypes');
 238     }
 239     if($capitalise) {
 240         $result=ucfirst($result);
 241     }
 242     return $result;
 243 }
 244
 245 /**
 246  * Handles the sending of file data to the user's browser, including support for
 247  * byteranges etc.
 248  * @param string $path Path of file on disk (including real filename), or actual content of file as string
 249  * @param string $filename Filename to send
 250  * @param int $lifetime Number of seconds before the file should expire from caches (default 24 hours)
 251  * @param int $filter 0 (default)=no filtering, 1=all files, 2=html files only
 252  * @param bool $pathisstring If true (default false), $path is the content to send and not the pathname
 253  * @param bool $forcedownload If true (default false), forces download of file rather than view in browser/plugin
 254  * @param string $mimetype Include to specify the MIME type; leave blank to have it guess the type from $filename
 255  */
 256 function send_file($path, $filename, $lifetime=86400 , $filter=0, $pathisstring=false, $forcedownload=false, $mimetype='') {
 257     global $CFG, $COURSE;
 258
 259     // Use given MIME type if specified, otherwise guess it using mimeinfo.
 260     // IE, Konqueror and Opera open html file directly in browser from web even when directed to save it to disk :-O
 261     // only Firefox saves all files locally before opening when content-disposition: attachment stated
 262     $isFF         = check_browser_version('Firefox', '1.5'); // only FF > 1.5 properly tested
 263     $mimetype     = ($forcedownload and !$isFF) ? 'application/x-forcedownload' :
 264                          ($mimetype ? $mimetype : mimeinfo('type', $filename));
 265     $lastmodified = $pathisstring ? time() : filemtime($path);
 266     $filesize     = $pathisstring ? strlen($path) : filesize($path);
 267
 268     //Adobe Acrobat Reader XSS prevention
 269     if ($mimetype=='application/pdf' or mimeinfo('type', $filename)=='application/pdf') {
 270         //please note that it prevents opening of pdfs in browser when http referer disabled
 271         //or file linked from another site; browser caching of pdfs is now disabled too
 272         if (!empty($_SERVER['HTTP_RANGE'])) {
 273             //already byteserving
 274             $lifetime = 1; // >0 needed for byteserving
 275         } else if (empty($_SERVER['HTTP_REFERER']) or strpos($_SERVER['HTTP_REFERER'], $CFG->wwwroot)!==0) {
 276             $mimetype = 'application/x-forcedownload';
 277             $forcedownload = true;
 278             $lifetime = 0;
 279         } else {
 280             $lifetime = 1; // >0 needed for byteserving
 281         }
 282     }
 283
 284     //IE compatibiltiy HACK!
 285     if (ini_get('zlib.output_compression')) {
 286         ini_set('zlib.output_compression', 'Off');
 287     }
 288
 289     //try to disable automatic sid rewrite in cookieless mode
 290     @ini_set("session.use_trans_sid", "false");
 291
 292     //do not put '@' before the next header to detect incorrect moodle configurations,
 293     //error should be better than "weird" empty lines for admins/users
 294     //TODO: should we remove all those @ before the header()? Are all of the values supported on all servers?
 295     header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
 296
 297     if ($forcedownload) {
 298         @header('Content-Disposition: attachment; filename='.$filename);
 299     } else {
 300         @header('Content-Disposition: inline; filename='.$filename);
 301     }
 302
 303     if ($lifetime > 0) {
 304         @header('Cache-Control: max-age='.$lifetime);
 305         @header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 306         @header('Pragma: ');
 307
 308         if (empty($CFG->disablebyteserving) && !$pathisstring && $mimetype != 'text/plain' && $mimetype != 'text/html') {
 309
 310             @header('Accept-Ranges: bytes');
 311
 312             if (!empty($_SERVER['HTTP_RANGE']) && strpos($_SERVER['HTTP_RANGE'],'bytes=') !== FALSE) {
 313                 // byteserving stuff - for acrobat reader and download accelerators
 314                 // see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
 315                 // inspired by: http://www.coneural.org/florian/papers/04_byteserving.php
 316                 $ranges = false;
 317                 if (preg_match_all('/(\d*)-(\d*)/', $_SERVER['HTTP_RANGE'], $ranges, PREG_SET_ORDER)) {
 318                     foreach ($ranges as $key=>$value) {
 319                         if ($ranges[$key][1] == '') {
 320                             //suffix case
 321                             $ranges[$key][1] = $filesize - $ranges[$key][2];
 322                             $ranges[$key][2] = $filesize - 1;
 323                         } else if ($ranges[$key][2] == '' || $ranges[$key][2] > $filesize - 1) {
 324                             //fix range length
 325                             $ranges[$key][2] = $filesize - 1;
 326                         }
 327                         if ($ranges[$key][2] != '' && $ranges[$key][2] < $ranges[$key][1]) {
 328                             //invalid byte-range ==> ignore header
 329                             $ranges = false;
 330                             break;
 331                         }
 332                         //prepare multipart header
 333                         $ranges[$key][0] =  "\r\n--".BYTESERVING_BOUNDARY."\r\nContent-Type: $mimetype\r\n";
 334                         $ranges[$key][0] .= "Content-Range: bytes {$ranges[$key][1]}-{$ranges[$key][2]}/$filesize\r\n\r\n";
 335                     }
 336                 } else {
 337                     $ranges = false;
 338                 }
 339                 if ($ranges) {
 340                     byteserving_send_file($path, $mimetype, $ranges);
 341                 }
 342             }
 343         } else {
 344             /// Do not byteserve (disabled, strings, text and html files).
 345             @header('Accept-Ranges: none');
 346         }
 347     } else { // Do not cache files in proxies and browsers
 348         if (strpos($CFG->wwwroot, 'https://') === 0) { //https sites - watch out for IE! KB812935 and KB316431
 349             @header('Cache-Control: max-age=10');
 350             @header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
 351             @header('Pragma: ');
 352         } else { //normal http - prevent caching at all cost
 353             @header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
 354             @header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
 355             @header('Pragma: no-cache');
 356         }
 357         @header('Accept-Ranges: none'); // Do not allow byteserving when caching disabled
 358     }
 359
 360     if (empty($filter)) {
 361         if ($mimetype == 'text/html' && !empty($CFG->usesid) && empty($_COOKIE['MoodleSession'.$CFG->sessioncookie])) {
 362             //cookieless mode - rewrite links
 363             @header('Content-Type: text/html');
 364             $path = $pathisstring ? $path : implode('', file($path));
 365             $path = sid_ob_rewrite($path);
 366             $filesize = strlen($path);
 367             $pathisstring = true;
 368         } else if ($mimetype == 'text/plain') {
 369             @header('Content-Type: Text/plain; charset=utf-8'); //add encoding
 370         } else {
 371             @header('Content-Type: '.$mimetype);
 372         }
 373         @header('Content-Length: '.$filesize);
 374         while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
 375         if ($pathisstring) {
 376             echo $path;
 377         } else {
 378             readfile_chunked($path);
 379         }
 380     } else {     // Try to put the file through filters
 381         if ($mimetype == 'text/html') {
 382             $options = new object();
 383             $options->noclean = true;
 384             $options->nocache = true; // temporary workaround for MDL-5136
 385             $text = $pathisstring ? $path : implode('', file($path));
 386             $output = format_text($text, FORMAT_HTML, $options, $COURSE->id);
 387             if (!empty($CFG->usesid) && empty($_COOKIE['MoodleSession'.$CFG->sessioncookie])) {
 388                 //cookieless mode - rewrite links
 389                 $output = sid_ob_rewrite($output);
 390             }
 391
 392             @header('Content-Length: '.strlen($output));
 393             @header('Content-Type: text/html');
 394             while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
 395             echo $output;
 396         // only filter text if filter all files is selected
 397         } else if (($mimetype == 'text/plain') and ($filter == 1)) {
 398             $options = new object();
 399             $options->newlines = false;
 400             $options->noclean = true;
 401             $text = htmlentities($pathisstring ? $path : implode('', file($path)));
 402             $output = '<pre>'. format_text($text, FORMAT_MOODLE, $options, $COURSE->id) .'</pre>';
 403             if (!empty($CFG->usesid) && empty($_COOKIE['MoodleSession'.$CFG->sessioncookie])) {
 404                 //cookieless mode - rewrite links
 405                 $output = sid_ob_rewrite($output);
 406             }
 407
 408             @header('Content-Length: '.strlen($output));
 409             @header('Content-Type: text/html; charset=utf-8'); //add encoding
 410             while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
 411             echo $output;
 412         } else {    // Just send it out raw
 413             @header('Content-Length: '.$filesize);
 414             @header('Content-Type: '.$mimetype);
 415             while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
 416             if ($pathisstring) {
 417                 echo $path;
 418             }else {
 419                 readfile_chunked($path);
 420             }
 421         }
 422     }
 423     die; //no more chars to output!!!
 424 }
 425
 426 function get_records_csv($file, $table) {
 427     global $CFG, $db;
 428
 429     if (!$metacolumns = $db->MetaColumns($CFG->prefix . $table)) {
 430         return false;
 431     }
 432
 433     if(!($handle = @fopen($file, 'r'))) {
 434         error('get_records_csv failed to open '.$file);
 435     }
 436
 437     $fieldnames = fgetcsv($handle, 4096);
 438     if(empty($fieldnames)) {
 439         fclose($handle);
 440         return false;
 441     }
 442
 443     $columns = array();
 444
 445     foreach($metacolumns as $metacolumn) {
 446         $ord = array_search($metacolumn->name, $fieldnames);
 447         if(is_int($ord)) {
 448             $columns[$metacolumn->name] = $ord;
 449         }
 450     }
 451
 452     $rows = array();
 453
 454     while (($data = fgetcsv($handle, 4096)) !== false) {
 455         $item = new stdClass;
 456         foreach($columns as $name => $ord) {
 457             $item->$name = $data[$ord];
 458         }
 459         $rows[] = $item;
 460     }
 461
 462     fclose($handle);
 463     return $rows;
 464 }
 465
 466 function put_records_csv($file, $records, $table = NULL) {
 467     global $CFG, $db;
 468
 469     if (empty($records)) {
 470         return true;
 471     }
 472
 473     $metacolumns = NULL;
 474     if ($table !== NULL && !$metacolumns = $db->MetaColumns($CFG->prefix . $table)) {
 475         return false;
 476     }
 477
 478     echo "x";
 479
 480     if(!($fp = @fopen($CFG->dataroot.'/temp/'.$file, 'w'))) {
 481         error('put_records_csv failed to open '.$file);
 482     }
 483
 484     $proto = reset($records);
 485     if(is_object($proto)) {
 486         $fields_records = array_keys(get_object_vars($proto));
 487     }
 488     else if(is_array($proto)) {
 489         $fields_records = array_keys($proto);
 490     }
 491     else {
 492         return false;
 493     }
 494     echo "x";
 495
 496     if(!empty($metacolumns)) {
 497         $fields_table = array_map(create_function('$a', 'return $a->name;'), $metacolumns);
 498         $fields = array_intersect($fields_records, $fields_table);
 499     }
 500     else {
 501         $fields = $fields_records;
 502     }
 503
 504     fwrite($fp, implode(',', $fields));
 505     fwrite($fp, "\r\n");
 506
 507     foreach($records as $record) {
 508         $array  = (array)$record;
 509         $values = array();
 510         foreach($fields as $field) {
 511             if(strpos($array[$field], ',')) {
 512                 $values[] = '"'.str_replace('"', '\"', $array[$field]).'"';
 513             }
 514             else {
 515                 $values[] = $array[$field];
 516             }
 517         }
 518         fwrite($fp, implode(',', $values)."\r\n");
 519     }
 520
 521     fclose($fp);
 522     return true;
 523 }
 524
 525
 526 /**
 527  * Recursively delete the file or folder with path $location. That is,
 528  * if it is a file delete it. If it is a folder, delete all its content
 529  * then delete it. If $location does not exist to start, that is not
 530  * considered an error.
 531  *
 532  * @param $location the path to remove.
 533  */
 534 function fulldelete($location) {
 535     if (is_dir($location)) {
 536         $currdir = opendir($location);
 537         while (false !== ($file = readdir($currdir))) {
 538             if ($file <> ".." && $file <> ".") {
 539                 $fullfile = $location."/".$file;
 540                 if (is_dir($fullfile)) {
 541                     if (!fulldelete($fullfile)) {
 542                         return false;
 543                     }
 544                 } else {
 545                     if (!unlink($fullfile)) {
 546                         return false;
 547                     }
 548                 }
 549             }
 550         }
 551         closedir($currdir);
 552         if (! rmdir($location)) {
 553             return false;
 554         }
 555
 556     } else if (file_exists($location)) {
 557         if (!unlink($location)) {
 558             return false;
 559         }
 560     }
 561     return true;
 562 }
 563
 564 /**
 565  * Improves memory consumptions and works around buggy readfile() in PHP 5.0.4 (2MB readfile limit).
 566  */
 567 function readfile_chunked($filename, $retbytes=true) {
 568     $chunksize = 1*(1024*1024); // 1MB chunks - must be less than 2MB!
 569     $buffer = '';
 570     $cnt =0;// $handle = fopen($filename, 'rb');
 571     $handle = fopen($filename, 'rb');
 572     if ($handle === false) {
 573         return false;
 574     }
 575
 576     while (!feof($handle)) {
 577         @set_time_limit(60*60); //reset time limit to 60 min - should be enough for 1 MB chunk
 578         $buffer = fread($handle, $chunksize);
 579         echo $buffer;
 580         flush();
 581         if ($retbytes) {
 582             $cnt += strlen($buffer);
 583         }
 584     }
 585     $status = fclose($handle);
 586     if ($retbytes && $status) {
 587         return $cnt; // return num. bytes delivered like readfile() does.
 588     }
 589     return $status;
 590 }
 591
 592 /**
 593  * Send requested byterange of file.
 594  */
 595 function byteserving_send_file($filename, $mimetype, $ranges) {
 596     $chunksize = 1*(1024*1024); // 1MB chunks - must be less than 2MB!
 597     $handle = fopen($filename, 'rb');
 598     if ($handle === false) {
 599         die;
 600     }
 601     if (count($ranges) == 1) { //only one range requested
 602         $length = $ranges[0][2] - $ranges[0][1] + 1;
 603         @header('HTTP/1.1 206 Partial content');
 604         @header('Content-Length: '.$length);
 605         @header('Content-Range: bytes '.$ranges[0][1].'-'.$ranges[0][2].'/'.filesize($filename));
 606         @header('Content-Type: '.$mimetype);
 607         while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
 608         $buffer = '';
 609         fseek($handle, $ranges[0][1]);
 610         while (!feof($handle) && $length > 0) {
 611             @set_time_limit(60*60); //reset time limit to 60 min - should be enough for 1 MB chunk
 612             $buffer = fread($handle, ($chunksize < $length ? $chunksize : $length));
 613             echo $buffer;
 614             flush();
 615             $length -= strlen($buffer);
 616         }
 617         fclose($handle);
 618         die;
 619     } else { // multiple ranges requested - not tested much
 620         $totallength = 0;
 621         foreach($ranges as $range) {
 622             $totallength += strlen($range[0]) + $range[2] - $range[1] + 1;
 623         }
 624         $totallength += strlen("\r\n--".BYTESERVING_BOUNDARY."--\r\n");
 625         @header('HTTP/1.1 206 Partial content');
 626         @header('Content-Length: '.$totallength);
 627         @header('Content-Type: multipart/byteranges; boundary='.BYTESERVING_BOUNDARY);
 628         //TODO: check if "multipart/x-byteranges" is more compatible with current readers/browsers/servers
 629         while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
 630         foreach($ranges as $range) {
 631             $length = $range[2] - $range[1] + 1;
 632             echo $range[0];
 633             $buffer = '';
 634             fseek($handle, $range[1]);
 635             while (!feof($handle) && $length > 0) {
 636                 @set_time_limit(60*60); //reset time limit to 60 min - should be enough for 1 MB chunk
 637                 $buffer = fread($handle, ($chunksize < $length ? $chunksize : $length));
 638                 echo $buffer;
 639                 flush();
 640                 $length -= strlen($buffer);
 641             }
 642         }
 643         echo "\r\n--".BYTESERVING_BOUNDARY."--\r\n";
 644         fclose($handle);
 645         die;
 646     }
 647 }
 648
 649 ?>