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