lib/resourcelib.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * Recourse module like helper functions
  20  *
  21  * @package    core
  22  * @subpackage lib
  23  * @copyright  2009 Petr Skoda (http://skodak.org)
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 defined('MOODLE_INTERNAL') || die();
  28
  29 /** Try the best way */
  30 define('RESOURCELIB_DISPLAY_AUTO', 0);
  31 /** Display using object tag */
  32 define('RESOURCELIB_DISPLAY_EMBED', 1);
  33 /** Display inside frame */
  34 define('RESOURCELIB_DISPLAY_FRAME', 2);
  35 /** Display normal link in new window */
  36 define('RESOURCELIB_DISPLAY_NEW', 3);
  37 /** Force download of file instead of display */
  38 define('RESOURCELIB_DISPLAY_DOWNLOAD', 4);
  39 /** Open directly */
  40 define('RESOURCELIB_DISPLAY_OPEN', 5);
  41 /** Open in "emulated" pop-up without navigation */
  42 define('RESOURCELIB_DISPLAY_POPUP', 6);
  43
  44 /** Legacy files not needed or new resource */
  45 define('RESOURCELIB_LEGACYFILES_NO', 0);
  46 /** Legacy files conversion marked as completed */
  47 define('RESOURCELIB_LEGACYFILES_DONE', 1);
  48 /** Legacy files conversion in progress*/
  49 define('RESOURCELIB_LEGACYFILES_ACTIVE', 2);
  50
  51
  52 /**
  53  * Try on demand migration of file from old course files
  54  * @param string $filepath old file path
  55  * @param int $cmid migrated course module if
  56  * @param int $courseid
  57  * @param string $component
  58  * @param string $filearea new file area
  59  * @param int $itemid migrated file item id
  60  * @return mixed, false if not found, stored_file instance if migrated to new area
  61  */
  62 function resourcelib_try_file_migration($filepath, $cmid, $courseid, $component, $filearea, $itemid) {
  63     $fs = get_file_storage();
  64
  65     if (stripos($filepath, '/backupdata/') === 0 or stripos($filepath, '/moddata/') === 0) {
  66         // do not steal protected files!
  67         return false;
  68     }
  69
  70     if (!$context = get_context_instance(CONTEXT_MODULE, $cmid)) {
  71         return false;
  72     }
  73     if (!$coursecontext = get_context_instance(CONTEXT_COURSE, $courseid)) {
  74         return false;
  75     }
  76
  77     $fullpath = rtrim("/$coursecontext->id/course/legacy/0".$filepath, '/');
  78     do {
  79         if (!$file = $fs->get_file_by_hash(sha1($fullpath))) {
  80             if ($file = $fs->get_file_by_hash(sha1("$fullpath/.")) and $file->is_directory()) {
  81                 if ($file = $fs->get_file_by_hash(sha1("$fullpath/index.htm"))) {
  82                     break;
  83                 }
  84                 if ($file = $fs->get_file_by_hash(sha1("$fullpath/index.html"))) {
  85                     break;
  86                 }
  87                 if ($file = $fs->get_file_by_hash(sha1("$fullpath/Default.htm"))) {
  88                     break;
  89                 }
  90             }
  91             return false;
  92         }
  93     } while (false);
  94
  95     // copy and keep the same path, name, etc.
  96     $file_record = array('contextid'=>$context->id, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid);
  97     try {
  98         return $fs->create_file_from_storedfile($file_record, $file);
  99     } catch (Exception $e) {
 100         // file may exist - highly unlikely, we do not want upgrades to stop here
 101         return false;
 102     }
 103 }
 104
 105 /**
 106  * Returns list of available display options
 107  * @param array $enabled list of options enabled in module configuration
 108  * @param int $current current display options for existing instances
 109  * @return array of key=>name pairs
 110  */
 111 function resourcelib_get_displayoptions(array $enabled, $current=null) {
 112     if (is_number($current)) {
 113         $enabled[] = $current;
 114     }
 115
 116     $options = array(RESOURCELIB_DISPLAY_AUTO     => get_string('resourcedisplayauto'),
 117                      RESOURCELIB_DISPLAY_EMBED    => get_string('resourcedisplayembed'),
 118                      RESOURCELIB_DISPLAY_FRAME    => get_string('resourcedisplayframe'),
 119                      RESOURCELIB_DISPLAY_NEW      => get_string('resourcedisplaynew'),
 120                      RESOURCELIB_DISPLAY_DOWNLOAD => get_string('resourcedisplaydownload'),
 121                      RESOURCELIB_DISPLAY_OPEN     => get_string('resourcedisplayopen'),
 122                      RESOURCELIB_DISPLAY_POPUP    => get_string('resourcedisplaypopup'));
 123
 124     $result = array();
 125
 126     foreach ($options as $key=>$value) {
 127         if (in_array($key, $enabled)) {
 128             $result[$key] = $value;
 129         }
 130     }
 131
 132     if (empty($result)) {
 133         // there should be always something in case admin misconfigures module
 134         $result[RESOURCELIB_DISPLAY_OPEN] = $options[RESOURCELIB_DISPLAY_OPEN];
 135     }
 136
 137     return $result;
 138 }
 139
 140 /**
 141  * Tries to guess correct mimetype for arbitrary URL
 142  * @param string $fullurl
 143  * @return string mimetype
 144  */
 145 function resourcelib_guess_url_mimetype($fullurl) {
 146     global $CFG;
 147     require_once("$CFG->libdir/filelib.php");
 148
 149     if ($fullurl instanceof moodle_url) {
 150         $fullurl = $fullurl->out(false);
 151     }
 152
 153     $matches = null;
 154     if (preg_match("|^(.*)/[a-z]*file.php(\?file=)?(/[^&\?#]*)|", $fullurl, $matches)) {
 155         // remove the special moodle file serving hacks so that the *file.php is ignored
 156         $fullurl = $matches[1].$matches[3];
 157     }
 158
 159     if (preg_match("|^(.*)#.*|", $fullurl, $matches)) {
 160         // ignore all anchors
 161         $fullurl = $matches[1];
 162     }
 163
 164     if (strpos($fullurl, '.php')){
 165         // we do not really know what is in general php script
 166         return 'text/html';
 167
 168     } else if (substr($fullurl, -1) === '/') {
 169         // directory index (http://example.com/smaples/)
 170         return 'text/html';
 171
 172     } else if (strpos($fullurl, '//') !== false and substr_count($fullurl, '/') == 2) {
 173         // just a host name (http://example.com), solves Australian servers "audio" problem too
 174         return 'text/html';
 175
 176     } else {
 177         // ok, this finally looks like a real file
 178         $parts = explode('?', $fullurl);
 179         $url = reset($parts);
 180         return mimeinfo('type', $url);
 181     }
 182 }
 183
 184 /**
 185  * Looks for the extension.
 186  *
 187  * @param string $fullurl
 188  * @return string file extension
 189  */
 190 function resourcelib_get_extension($fullurl) {
 191
 192     if ($fullurl instanceof moodle_url) {
 193         $fullurl = $fullurl->out(false);
 194     }
 195
 196     $matches = null;
 197     if (preg_match("|^(.*)/[a-z]*file.php(\?file=)?(/.*)|", $fullurl, $matches)) {
 198         // remove the special moodle file serving hacks so that the *file.php is ignored
 199         $fullurl = $matches[1].$matches[3];
 200     }
 201
 202     $matches = null;
 203     if (preg_match('/^[^#\?]+\.([a-z0-9]+)([#\?].*)?$/i', $fullurl, $matches)) {
 204         return strtolower($matches[1]);
 205     }
 206
 207     return '';
 208 }
 209
 210 /**
 211  * Returns image embedding html.
 212  * @param string $fullurl
 213  * @param string $title
 214  * @return string html
 215  */
 216 function resourcelib_embed_image($fullurl, $title) {
 217     $code = '';
 218     $code .= '<div class="resourcecontent resourceimg">';
 219     $code .= "<img title=\"".strip_tags(format_string($title))."\" class=\"resourceimage\" src=\"$fullurl\" alt=\"\" />";
 220     $code .= '</div>';
 221
 222     return $code;
 223 }
 224
 225 /**
 226  * Returns mp3 embedding html.
 227  * @param string $fullurl
 228  * @param string $title
 229  * @param string $clicktoopen
 230  * @return string html
 231  */
 232 function resourcelib_embed_mp3($fullurl, $title, $clicktoopen) {
 233
 234     if ($fullurl instanceof moodle_url) {
 235         $fullurl = $fullurl->out(false);
 236     } else {
 237         $fullurl = str_replace('&amp;', '&', $fullurl);
 238     }
 239
 240     $id = 'resource_mp3_'.time(); //we need something unique because it might be stored in text cache
 241
 242     // note: size is specified in theme, it can be made as wide as necessary, but the height can not be changed
 243
 244     $output = '<div class="resourcecontent resourcemp3">';
 245     $output .= html_writer::tag('span', $clicktoopen, array('id'=>$id, 'class'=>'resourcemediaplugin resourcemediaplugin_mp3', 'title'=>$title));
 246     $output .= html_writer::script(js_writer::function_call('M.util.add_audio_player', array($id, $fullurl, false)));
 247     $output .= '</div>';
 248
 249     return $output;
 250 }
 251
 252 /**
 253  * Returns flash video embedding html.
 254  * @param string $fullurl
 255  * @param string $title
 256  * @param string $clicktoopen
 257  * @return string html
 258  */
 259 function resourcelib_embed_flashvideo($fullurl, $title, $clicktoopen) {
 260     global $CFG, $PAGE;
 261
 262     if ($fullurl instanceof moodle_url) {
 263         $fullurl = $fullurl->out(false);
 264     } else {
 265         $fullurl = str_replace('&amp;', '&', $fullurl);
 266     }
 267
 268     $id = 'resource_flv_'.time(); //we need something unique because it might be stored in text cache
 269
 270     //note: nobody should be adding any dimensions to themes!!!
 271
 272     if (preg_match('/\?d=([\d]{1,4}%?)x([\d]{1,4}%?)/', $fullurl, $matches)) {
 273         $width    = $matches[1];
 274         $height   = $matches[2];
 275         $autosize = false;
 276     } else {
 277         $width    = 400;
 278         $height   = 300;
 279         $autosize = true;
 280     }
 281     $output = '<div class="resourcecontent resourceflv">';
 282     $output .= html_writer::tag('span', $clicktoopen, array('id'=>$id, 'class'=>'resourcemediaplugin resourcemediaplugin_flv', 'title'=>$title));
 283     $output .= html_writer::script(js_writer::function_call('M.util.add_video_player', array($id, rawurlencode($fullurl), $width, $height, $autosize)));
 284     $output .= '</div>';
 285
 286     return $output;
 287 }
 288
 289 /**
 290  * Returns flash embedding html.
 291  * @param string $fullurl
 292  * @param string $title
 293  * @param string $clicktoopen
 294  * @return string html
 295  */
 296 function resourcelib_embed_flash($fullurl, $title, $clicktoopen) {
 297     if (preg_match('/[#\?]d=([\d]{1,4}%?)x([\d]{1,4}%?)/', $fullurl, $matches)) {
 298         $width    = $matches[1];
 299         $height   = $matches[2];
 300     } else {
 301         $width    = 400;
 302         $height   = 300;
 303     }
 304
 305     $code = <<<EOT
 306 <div class="resourcecontent resourceswf">
 307   <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="$width" height="$height">
 308     <param name="movie" value="$fullurl" />
 309     <param name="autoplay" value="true" />
 310     <param name="loop" value="true" />
 311     <param name="controller" value="true" />
 312     <param name="scale" value="aspect" />
 313     <param name="base" value="." />
 314 <!--[if !IE]>-->
 315     <object type="application/x-shockwave-flash" data="$fullurl" width="$width" height="$height">
 316       <param name="controller" value="true" />
 317       <param name="autoplay" value="true" />
 318       <param name="loop" value="true" />
 319       <param name="scale" value="aspect" />
 320       <param name="base" value="." />
 321 <!--<![endif]-->
 322 $clicktoopen
 323 <!--[if !IE]>-->
 324     </object>
 325 <!--<![endif]-->
 326   </object>
 327 </div>
 328 EOT;
 329
 330     return $code;
 331 }
 332
 333 /**
 334  * Returns ms media embedding html.
 335  * @param string $fullurl
 336  * @param string $title
 337  * @param string $clicktoopen
 338  * @return string html
 339  */
 340 function resourcelib_embed_mediaplayer($fullurl, $title, $clicktoopen) {
 341     $code = <<<EOT
 342 <div class="resourcecontent resourcewmv">
 343   <object type="video/x-ms-wmv" data="$fullurl">
 344     <param name="controller" value="true" />
 345     <param name="autostart" value="true" />
 346     <param name="src" value="$fullurl" />
 347     <param name="scale" value="noScale" />
 348     $clicktoopen
 349   </object>
 350 </div>
 351 EOT;
 352
 353     return $code;
 354 }
 355
 356 /**
 357  * Returns quicktime embedding html.
 358  * @param string $fullurl
 359  * @param string $title
 360  * @param string $clicktoopen
 361  * @return string html
 362  */
 363 function resourcelib_embed_quicktime($fullurl, $title, $clicktoopen) {
 364     $code = <<<EOT
 365 <div class="resourcecontent resourceqt">
 366   <object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" codebase="http://www.apple.com/qtactivex/qtplugin.cab">
 367     <param name="src" value="$fullurl" />
 368     <param name="autoplay" value="true" />
 369     <param name="loop" value="true" />
 370     <param name="controller" value="true" />
 371     <param name="scale" value="aspect" />
 372 <!--[if !IE]>-->
 373     <object type="video/quicktime" data="$fullurl">
 374       <param name="controller" value="true" />
 375       <param name="autoplay" value="true" />
 376       <param name="loop" value="true" />
 377       <param name="scale" value="aspect" />
 378 <!--<![endif]-->
 379 $clicktoopen
 380 <!--[if !IE]>-->
 381     </object>
 382 <!--<![endif]-->
 383   </object>
 384 </div>
 385 EOT;
 386
 387     return $code;
 388 }
 389
 390 /**
 391  * Returns mpeg embedding html.
 392  * @param string $fullurl
 393  * @param string $title
 394  * @param string $clicktoopen
 395  * @return string html
 396  */
 397 function resourcelib_embed_mpeg($fullurl, $title, $clicktoopen) {
 398     $code = <<<EOT
 399 <div class="resourcecontent resourcempeg">
 400   <object classid="CLSID:22d6f312-b0f6-11d0-94ab-0080c74c7e95" codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsm p2inf.cab#Version=5,1,52,701" type="application/x-oleobject">
 401     <param name="fileName" value="$fullurl" />
 402     <param name="autoStart" value="true" />
 403     <param name="animationatStart" value="true" />
 404     <param name="transparentatStart" value="true" />
 405     <param name="showControls" value="true" />
 406     <param name="Volume" value="-450" />
 407 <!--[if !IE]>-->
 408     <object type="video/mpeg" data="$fullurl">
 409       <param name="controller" value="true" />
 410       <param name="autostart" value="true" />
 411       <param name="src" value="$fullurl" />
 412 <!--<![endif]-->
 413 $clicktoopen
 414 <!--[if !IE]>-->
 415     </object>
 416 <!--<![endif]-->
 417   </object>
 418 </div>
 419 EOT;
 420
 421     return $code;
 422 }
 423
 424 /**
 425  * Returns real media embedding html.
 426  * @param string $fullurl
 427  * @param string $title
 428  * @param string $clicktoopen
 429  * @return string html
 430  */
 431 function resourcelib_embed_real($fullurl, $title, $clicktoopen) {
 432     $code = <<<EOT
 433 <div class="resourcecontent resourcerm">
 434   <object classid="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA" data="$fullurl" width="320" height="240">
 435     <param name="src" value="$fullurl" />
 436     <param name="controls" value="All" />
 437 <!--[if !IE]>-->
 438     <object type="audio/x-pn-realaudio-plugin" data="$fullurl" width="320" height="240">
 439     <param name="src" value="$fullurl" />
 440       <param name="controls" value="All" />
 441 <!--<![endif]-->
 442 $clicktoopen
 443 <!--[if !IE]>-->
 444     </object>
 445 <!--<![endif]-->
 446   </object>
 447 </div>
 448 EOT;
 449
 450     return $code;
 451 }
 452
 453 /**
 454  * Returns general link or pdf embedding html.
 455  * @param string $fullurl
 456  * @param string $title
 457  * @param string $clicktoopen
 458  * @return string html
 459  */
 460 function resourcelib_embed_pdf($fullurl, $title, $clicktoopen) {
 461     global $CFG, $PAGE;
 462
 463     $code = <<<EOT
 464 <div class="resourcecontent resourcepdf">
 465   <object id="resourceobject" data="$fullurl" type="application/pdf" width="800" height="600">
 466     <param name="src" value="$fullurl" />
 467     $clicktoopen
 468   </object>
 469 </div>
 470 EOT;
 471
 472     // the size is hardcoded in the boject obove intentionally because it is adjusted by the following function on-the-fly
 473     $PAGE->requires->js_init_call('M.util.init_maximised_embed', array('resourceobject'), true);
 474
 475     return $code;
 476 }
 477
 478
 479 /**
 480  * Returns general link or file embedding html.
 481  * @param string $fullurl
 482  * @param string $title
 483  * @param string $clicktoopen
 484  * @param string $mimetype
 485  * @return string html
 486  */
 487 function resourcelib_embed_general($fullurl, $title, $clicktoopen, $mimetype) {
 488     global $CFG, $PAGE;
 489
 490     if ($fullurl instanceof moodle_url) {
 491         $fullurl = $fullurl->out();
 492     }
 493
 494     $iframe = false;
 495
 496     $param = '<param name="src" value="'.$fullurl.'" />';
 497
 498     // IE can not embed stuff properly, that is why we use iframe instead.
 499     // Unfortunately this tag does not validate in xhtml strict mode,
 500     // but in any case it is undeprecated in HTML 5 - we will use it everywhere soon!
 501     if ($mimetype === 'text/html' and check_browser_version('MSIE', 5)) {
 502         $iframe = true;
 503     }
 504
 505     if ($iframe) {
 506         $code = <<<EOT
 507 <div class="resourcecontent resourcegeneral">
 508   <iframe id="resourceobject" src="$fullurl">
 509     $clicktoopen
 510   </iframe>
 511 </div>
 512 EOT;
 513     } else {
 514         $code = <<<EOT
 515 <div class="resourcecontent resourcegeneral">
 516   <object id="resourceobject" data="$fullurl" type="$mimetype"  width="800" height="600">
 517     $param
 518     $clicktoopen
 519   </object>
 520 </div>
 521 EOT;
 522     }
 523
 524     // the size is hardcoded in the boject obove intentionally because it is adjusted by the following function on-the-fly
 525     $PAGE->requires->js_init_call('M.util.init_maximised_embed', array('resourceobject'), true);
 526
 527     return $code;
 528 }