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Differences Between: [Versions 310 and 400] [Versions 311 and 400] [Versions 39 and 400] [Versions 400 and 401] [Versions 400 and 402] [Versions 400 and 403]

   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   * Private url module utility functions
  20   *
  21   * @package    mod_url
  22   * @copyright  2009 Petr Skoda  {@link http://skodak.org}
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   */
  25  
  26  defined('MOODLE_INTERNAL') || die;
  27  
  28  require_once("$CFG->libdir/filelib.php");
  29  require_once("$CFG->libdir/resourcelib.php");
  30  require_once("$CFG->dirroot/mod/url/lib.php");
  31  
  32  /**
  33   * This methods does weak url validation, we are looking for major problems only,
  34   * no strict RFE validation.
  35   *
  36   * @param $url
  37   * @return bool true is seems valid, false if definitely not valid URL
  38   */
  39  function url_appears_valid_url($url) {
  40      if (preg_match('/^(\/|https?:|ftp:)/i', $url)) {
  41          // note: this is not exact validation, we look for severely malformed URLs only
  42          return (bool) preg_match('/^[a-z]+:\/\/([^:@\s]+:[^@\s]+@)?[^ @]+(:[0-9]+)?(\/[^#]*)?(#.*)?$/i', $url);
  43      } else {
  44          return (bool)preg_match('/^[a-z]+:\/\/...*$/i', $url);
  45      }
  46  }
  47  
  48  /**
  49   * Fix common URL problems that we want teachers to see fixed
  50   * the next time they edit the resource.
  51   *
  52   * This function does not include any XSS protection.
  53   *
  54   * @param string $url
  55   * @return string
  56   */
  57  function url_fix_submitted_url($url) {
  58      // note: empty urls are prevented in form validation
  59      $url = trim($url);
  60  
  61      // remove encoded entities - we want the raw URI here
  62      $url = html_entity_decode($url, ENT_QUOTES, 'UTF-8');
  63  
  64      if (!preg_match('|^[a-z]+:|i', $url) and !preg_match('|^/|', $url)) {
  65          // invalid URI, try to fix it by making it normal URL,
  66          // please note relative urls are not allowed, /xx/yy links are ok
  67          $url = 'http://'.$url;
  68      }
  69  
  70      return $url;
  71  }
  72  
  73  /**
  74   * Return full url with all extra parameters
  75   *
  76   * This function does not include any XSS protection.
  77   *
  78   * @param string $url
  79   * @param object $cm
  80   * @param object $course
  81   * @param object $config
  82   * @return string url with & encoded as &amp;
  83   */
  84  function url_get_full_url($url, $cm, $course, $config=null) {
  85  
  86      $parameters = empty($url->parameters) ? [] : (array) unserialize_array($url->parameters);
  87  
  88      // make sure there are no encoded entities, it is ok to do this twice
  89      $fullurl = html_entity_decode($url->externalurl, ENT_QUOTES, 'UTF-8');
  90  
  91      $letters = '\pL';
  92      $latin = 'a-zA-Z';
  93      $digits = '0-9';
  94      $symbols = '\x{20E3}\x{00AE}\x{00A9}\x{203C}\x{2047}\x{2048}\x{2049}\x{3030}\x{303D}\x{2139}\x{2122}\x{3297}\x{3299}' .
  95                 '\x{2300}-\x{23FF}\x{2600}-\x{27BF}\x{2B00}-\x{2BF0}';
  96      $arabic = '\x{FE00}-\x{FEFF}';
  97      $math = '\x{2190}-\x{21FF}\x{2900}-\x{297F}';
  98      $othernumbers = '\x{2460}-\x{24FF}';
  99      $geometric = '\x{25A0}-\x{25FF}';
 100      $emojis = '\x{1F000}-\x{1F6FF}';
 101  
 102      if (preg_match('/^(\/|https?:|ftp:)/i', $fullurl) or preg_match('|^/|', $fullurl)) {
 103          // encode extra chars in URLs - this does not make it always valid, but it helps with some UTF-8 problems
 104          // Thanks to 💩.la emojis count as valid, too.
 105          $allowed = "[" . $letters . $latin . $digits . $symbols . $arabic . $math . $othernumbers . $geometric .
 106              $emojis . "]" . preg_quote(';/?:@=&$_.+!*(),-#%', '/');
 107          $fullurl = preg_replace_callback("/[^$allowed]/u", 'url_filter_callback', $fullurl);
 108      } else {
 109          // encode special chars only
 110          $fullurl = str_replace('"', '%22', $fullurl);
 111          $fullurl = str_replace('\'', '%27', $fullurl);
 112          $fullurl = str_replace(' ', '%20', $fullurl);
 113          $fullurl = str_replace('<', '%3C', $fullurl);
 114          $fullurl = str_replace('>', '%3E', $fullurl);
 115      }
 116  
 117      // add variable url parameters
 118      if (!empty($parameters)) {
 119          if (!$config) {
 120              $config = get_config('url');
 121          }
 122          $paramvalues = url_get_variable_values($url, $cm, $course, $config);
 123  
 124          foreach ($parameters as $parse=>$parameter) {
 125              if (isset($paramvalues[$parameter])) {
 126                  $parameters[$parse] = rawurlencode($parse).'='.rawurlencode($paramvalues[$parameter]);
 127              } else {
 128                  unset($parameters[$parse]);
 129              }
 130          }
 131  
 132          if (!empty($parameters)) {
 133              if (stripos($fullurl, 'teamspeak://') === 0) {
 134                  $fullurl = $fullurl.'?'.implode('?', $parameters);
 135              } else {
 136                  $join = (strpos($fullurl, '?') === false) ? '?' : '&';
 137                  $fullurl = $fullurl.$join.implode('&', $parameters);
 138              }
 139          }
 140      }
 141  
 142      // encode all & to &amp; entity
 143      $fullurl = str_replace('&', '&amp;', $fullurl);
 144  
 145      return $fullurl;
 146  }
 147  
 148  /**
 149   * Unicode encoding helper callback
 150   * @internal
 151   * @param array $matches
 152   * @return string
 153   */
 154  function url_filter_callback($matches) {
 155      return rawurlencode($matches[0]);
 156  }
 157  
 158  /**
 159   * Print url header.
 160   * @param object $url
 161   * @param object $cm
 162   * @param object $course
 163   * @return void
 164   */
 165  function url_print_header($url, $cm, $course) {
 166      global $PAGE, $OUTPUT;
 167  
 168      $PAGE->set_title($course->shortname.': '.$url->name);
 169      $PAGE->set_heading($course->fullname);
 170      $PAGE->set_activity_record($url);
 171      echo $OUTPUT->header();
 172  }
 173  
 174  /**
 175   * Get url introduction.
 176   *
 177   * @param object $url
 178   * @param object $cm
 179   * @param bool $ignoresettings print even if not specified in modedit
 180   * @return string
 181   */
 182  function url_get_intro(object $url, object $cm, bool $ignoresettings = false): string {
 183      $options = empty($url->displayoptions) ? [] : (array) unserialize_array($url->displayoptions);
 184      if ($ignoresettings or !empty($options['printintro'])) {
 185          if (trim(strip_tags($url->intro))) {
 186              return format_module_intro('url', $url, $cm->id);
 187          }
 188      }
 189  
 190      return '';
 191  }
 192  
 193  /**
 194   * Display url frames.
 195   * @param object $url
 196   * @param object $cm
 197   * @param object $course
 198   * @return does not return
 199   */
 200  function url_display_frame($url, $cm, $course) {
 201      global $PAGE, $OUTPUT, $CFG;
 202  
 203      $frame = optional_param('frameset', 'main', PARAM_ALPHA);
 204  
 205      if ($frame === 'top') {
 206          $PAGE->set_pagelayout('frametop');
 207          $PAGE->activityheader->set_attrs([
 208              'description' => url_get_intro($url, $cm),
 209              'title' => format_string($url->name)
 210          ]);
 211          url_print_header($url, $cm, $course);
 212          echo $OUTPUT->footer();
 213          die;
 214  
 215      } else {
 216          $config = get_config('url');
 217          $context = context_module::instance($cm->id);
 218          $exteurl = url_get_full_url($url, $cm, $course, $config);
 219          $navurl = "$CFG->wwwroot/mod/url/view.php?id=$cm->id&amp;frameset=top";
 220          $coursecontext = context_course::instance($course->id);
 221          $courseshortname = format_string($course->shortname, true, array('context' => $coursecontext));
 222          $title = strip_tags($courseshortname.': '.format_string($url->name));
 223          $framesize = $config->framesize;
 224          $modulename = s(get_string('modulename','url'));
 225          $contentframetitle = s(format_string($url->name));
 226          $dir = get_string('thisdirection', 'langconfig');
 227  
 228          $extframe = <<<EOF
 229  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
 230  <html dir="$dir">
 231    <head>
 232      <meta http-equiv="content-type" content="text/html; charset=utf-8" />
 233      <title>$title</title>
 234    </head>
 235    <frameset rows="$framesize,*">
 236      <frame src="$navurl" title="$modulename"/>
 237      <frame src="$exteurl" title="$contentframetitle"/>
 238    </frameset>
 239  </html>
 240  EOF;
 241  
 242          @header('Content-Type: text/html; charset=utf-8');
 243          echo $extframe;
 244          die;
 245      }
 246  }
 247  
 248  /**
 249   * Print url info and link.
 250   * @param object $url
 251   * @param object $cm
 252   * @param object $course
 253   * @return does not return
 254   */
 255  function url_print_workaround($url, $cm, $course) {
 256      global $OUTPUT, $PAGE, $USER;
 257  
 258      $PAGE->activityheader->set_description(url_get_intro($url, $cm, true));
 259      url_print_header($url, $cm, $course);
 260  
 261      $fullurl = url_get_full_url($url, $cm, $course);
 262  
 263      $display = url_get_final_display_type($url);
 264      if ($display == RESOURCELIB_DISPLAY_POPUP) {
 265          $jsfullurl = addslashes_js($fullurl);
 266          $options = empty($url->displayoptions) ? [] : (array) unserialize_array($url->displayoptions);
 267          $width  = empty($options['popupwidth'])  ? 620 : $options['popupwidth'];
 268          $height = empty($options['popupheight']) ? 450 : $options['popupheight'];
 269          $wh = "width=$width,height=$height,toolbar=no,location=no,menubar=no,copyhistory=no,status=no,directories=no,scrollbars=yes,resizable=yes";
 270          $extra = "onclick=\"window.open('$jsfullurl', '', '$wh'); return false;\"";
 271  
 272      } else if ($display == RESOURCELIB_DISPLAY_NEW) {
 273          $extra = "onclick=\"this.target='_blank';\"";
 274  
 275      } else {
 276          $extra = '';
 277      }
 278  
 279      echo '<div class="urlworkaround">';
 280      print_string('clicktoopen', 'url', "<a href=\"$fullurl\" $extra>$fullurl</a>");
 281      echo '</div>';
 282  
 283      echo $OUTPUT->footer();
 284      die;
 285  }
 286  
 287  /**
 288   * Display embedded url file.
 289   * @param object $url
 290   * @param object $cm
 291   * @param object $course
 292   * @return does not return
 293   */
 294  function url_display_embed($url, $cm, $course) {
 295      global $PAGE, $OUTPUT;
 296  
 297      $mimetype = resourcelib_guess_url_mimetype($url->externalurl);
 298      $fullurl  = url_get_full_url($url, $cm, $course);
 299      $title    = $url->name;
 300  
 301      $link = html_writer::tag('a', $fullurl, array('href'=>str_replace('&amp;', '&', $fullurl)));
 302      $clicktoopen = get_string('clicktoopen', 'url', $link);
 303      $moodleurl = new moodle_url($fullurl);
 304  
 305      $extension = resourcelib_get_extension($url->externalurl);
 306  
 307      $mediamanager = core_media_manager::instance($PAGE);
 308      $embedoptions = array(
 309          core_media_manager::OPTION_TRUSTED => true,
 310          core_media_manager::OPTION_BLOCK => true
 311      );
 312  
 313      if (in_array($mimetype, array('image/gif','image/jpeg','image/png'))) {  // It's an image
 314          $code = resourcelib_embed_image($fullurl, $title);
 315  
 316      } else if ($mediamanager->can_embed_url($moodleurl, $embedoptions)) {
 317          // Media (audio/video) file.
 318          $code = $mediamanager->embed_url($moodleurl, $title, 0, 0, $embedoptions);
 319  
 320      } else {
 321          // anything else - just try object tag enlarged as much as possible
 322          $code = resourcelib_embed_general($fullurl, $title, $clicktoopen, $mimetype);
 323      }
 324  
 325      $PAGE->activityheader->set_description(url_get_intro($url, $cm));
 326      url_print_header($url, $cm, $course);
 327  
 328      echo $code;
 329  
 330      echo $OUTPUT->footer();
 331      die;
 332  }
 333  
 334  /**
 335   * Decide the best display format.
 336   * @param object $url
 337   * @return int display type constant
 338   */
 339  function url_get_final_display_type($url) {
 340      global $CFG;
 341  
 342      if ($url->display != RESOURCELIB_DISPLAY_AUTO) {
 343          return $url->display;
 344      }
 345  
 346      // detect links to local moodle pages
 347      if (strpos($url->externalurl, $CFG->wwwroot) === 0) {
 348          if (strpos($url->externalurl, 'file.php') === false and strpos($url->externalurl, '.php') !== false ) {
 349              // most probably our moodle page with navigation
 350              return RESOURCELIB_DISPLAY_OPEN;
 351          }
 352      }
 353  
 354      // Binaries and other formats that are known to cause trouble for external links.
 355      static $download = ['application/zip', 'application/x-tar', 'application/g-zip',
 356                          'application/pdf', 'text/html', 'document/unknown'];
 357      static $embed    = array('image/gif', 'image/jpeg', 'image/png', 'image/svg+xml',         // images
 358                               'application/x-shockwave-flash', 'video/x-flv', 'video/x-ms-wm', // video formats
 359                               'video/quicktime', 'video/mpeg', 'video/mp4',
 360                               'audio/mp3', 'audio/x-realaudio-plugin', 'x-realaudio-plugin',   // audio formats,
 361                              );
 362  
 363      $mimetype = resourcelib_guess_url_mimetype($url->externalurl);
 364  
 365      if (in_array($mimetype, $download)) {
 366          return RESOURCELIB_DISPLAY_DOWNLOAD;
 367      }
 368      if (in_array($mimetype, $embed)) {
 369          return RESOURCELIB_DISPLAY_EMBED;
 370      }
 371  
 372      // let the browser deal with it somehow
 373      return RESOURCELIB_DISPLAY_OPEN;
 374  }
 375  
 376  /**
 377   * Get the parameters that may be appended to URL
 378   * @param object $config url module config options
 379   * @return array array describing opt groups
 380   */
 381  function url_get_variable_options($config) {
 382      global $CFG;
 383  
 384      $options = array();
 385      $options[''] = array('' => get_string('chooseavariable', 'url'));
 386  
 387      $options[get_string('course')] = array(
 388          'courseid'        => 'id',
 389          'coursefullname'  => get_string('fullnamecourse'),
 390          'courseshortname' => get_string('shortnamecourse'),
 391          'courseidnumber'  => get_string('idnumbercourse'),
 392          'coursesummary'   => get_string('summary'),
 393          'courseformat'    => get_string('format'),
 394      );
 395  
 396      $options[get_string('modulename', 'url')] = array(
 397          'urlinstance'     => 'id',
 398          'urlcmid'         => 'cmid',
 399          'urlname'         => get_string('name'),
 400          'urlidnumber'     => get_string('idnumbermod'),
 401      );
 402  
 403      $options[get_string('miscellaneous')] = array(
 404          'sitename'        => get_string('fullsitename'),
 405          'serverurl'       => get_string('serverurl', 'url'),
 406          'currenttime'     => get_string('time'),
 407          'lang'            => get_string('language'),
 408      );
 409      if (!empty($config->secretphrase)) {
 410          $options[get_string('miscellaneous')]['encryptedcode'] = get_string('encryptedcode');
 411      }
 412  
 413      $options[get_string('user')] = array(
 414          'userid'          => 'id',
 415          'userusername'    => get_string('username'),
 416          'useridnumber'    => get_string('idnumber'),
 417          'userfirstname'   => get_string('firstname'),
 418          'userlastname'    => get_string('lastname'),
 419          'userfullname'    => get_string('fullnameuser'),
 420          'useremail'       => get_string('email'),
 421          'userphone1'      => get_string('phone1'),
 422          'userphone2'      => get_string('phone2'),
 423          'userinstitution' => get_string('institution'),
 424          'userdepartment'  => get_string('department'),
 425          'useraddress'     => get_string('address'),
 426          'usercity'        => get_string('city'),
 427          'usertimezone'    => get_string('timezone'),
 428      );
 429  
 430      if ($config->rolesinparams) {
 431          $roles = role_fix_names(get_all_roles());
 432          $roleoptions = array();
 433          foreach ($roles as $role) {
 434              $roleoptions['course'.$role->shortname] = get_string('yourwordforx', '', $role->localname);
 435          }
 436          $options[get_string('roles')] = $roleoptions;
 437      }
 438  
 439      return $options;
 440  }
 441  
 442  /**
 443   * Get the parameter values that may be appended to URL
 444   * @param object $url module instance
 445   * @param object $cm
 446   * @param object $course
 447   * @param object $config module config options
 448   * @return array of parameter values
 449   */
 450  function url_get_variable_values($url, $cm, $course, $config) {
 451      global $USER, $CFG;
 452  
 453      $site = get_site();
 454  
 455      $coursecontext = context_course::instance($course->id);
 456  
 457      $values = array (
 458          'courseid'        => $course->id,
 459          'coursefullname'  => format_string($course->fullname, true, array('context' => $coursecontext)),
 460          'courseshortname' => format_string($course->shortname, true, array('context' => $coursecontext)),
 461          'courseidnumber'  => $course->idnumber,
 462          'coursesummary'   => $course->summary,
 463          'courseformat'    => $course->format,
 464          'lang'            => current_language(),
 465          'sitename'        => format_string($site->fullname, true, array('context' => $coursecontext)),
 466          'serverurl'       => $CFG->wwwroot,
 467          'currenttime'     => time(),
 468          'urlinstance'     => $url->id,
 469          'urlcmid'         => $cm->id,
 470          'urlname'         => format_string($url->name, true, array('context' => $coursecontext)),
 471          'urlidnumber'     => $cm->idnumber,
 472      );
 473  
 474      if (isloggedin()) {
 475          $values['userid']          = $USER->id;
 476          $values['userusername']    = $USER->username;
 477          $values['useridnumber']    = $USER->idnumber;
 478          $values['userfirstname']   = $USER->firstname;
 479          $values['userlastname']    = $USER->lastname;
 480          $values['userfullname']    = fullname($USER);
 481          $values['useremail']       = $USER->email;
 482          $values['userphone1']      = $USER->phone1;
 483          $values['userphone2']      = $USER->phone2;
 484          $values['userinstitution'] = $USER->institution;
 485          $values['userdepartment']  = $USER->department;
 486          $values['useraddress']     = $USER->address;
 487          $values['usercity']        = $USER->city;
 488          $now = new DateTime('now', core_date::get_user_timezone_object());
 489          $values['usertimezone']    = $now->getOffset() / 3600.0; // Value in hours for BC.
 490      }
 491  
 492      // weak imitation of Single-Sign-On, for backwards compatibility only
 493      // NOTE: login hack is not included in 2.0 any more, new contrib auth plugin
 494      //       needs to be createed if somebody needs the old functionality!
 495      if (!empty($config->secretphrase)) {
 496          $values['encryptedcode'] = url_get_encrypted_parameter($url, $config);
 497      }
 498  
 499      //hmm, this is pretty fragile and slow, why do we need it here??
 500      if ($config->rolesinparams) {
 501          $coursecontext = context_course::instance($course->id);
 502          $roles = role_fix_names(get_all_roles($coursecontext), $coursecontext, ROLENAME_ALIAS);
 503          foreach ($roles as $role) {
 504              $values['course'.$role->shortname] = $role->localname;
 505          }
 506      }
 507  
 508      return $values;
 509  }
 510  
 511  /**
 512   * BC internal function
 513   * @param object $url
 514   * @param object $config
 515   * @return string
 516   */
 517  function url_get_encrypted_parameter($url, $config) {
 518      global $CFG;
 519  
 520      if (file_exists("$CFG->dirroot/local/externserverfile.php")) {
 521          require_once("$CFG->dirroot/local/externserverfile.php");
 522          if (function_exists('extern_server_file')) {
 523              return extern_server_file($url, $config);
 524          }
 525      }
 526      return md5(getremoteaddr().$config->secretphrase);
 527  }
 528  
 529  /**
 530   * Optimised mimetype detection from general URL
 531   * @param $fullurl
 532   * @param int $size of the icon.
 533   * @return string|null mimetype or null when the filetype is not relevant.
 534   */
 535  function url_guess_icon($fullurl, $size = null) {
 536      global $CFG;
 537      require_once("$CFG->libdir/filelib.php");
 538  
 539      if (substr_count($fullurl, '/') < 3 or substr($fullurl, -1) === '/') {
 540          // Most probably default directory - index.php, index.html, etc. Return null because
 541          // we want to use the default module icon instead of the HTML file icon.
 542          return null;
 543      }
 544  
 545      try {
 546          // There can be some cases where the url is invalid making parse_url() to return false.
 547          // That will make moodle_url class to throw an exception, so we need to catch the exception to prevent errors.
 548          $moodleurl = new moodle_url($fullurl);
 549          $fullurl = $moodleurl->out_omit_querystring();
 550      } catch (\moodle_exception $e) {
 551          // If an exception is thrown, means the url is invalid. No need to log exception.
 552          return null;
 553      }
 554  
 555      $icon = file_extension_icon($fullurl, $size);
 556      $htmlicon = file_extension_icon('.htm', $size);
 557      $unknownicon = file_extension_icon('', $size);
 558      $phpicon = file_extension_icon('.php', $size); // Exception for php files.
 559  
 560      // We do not want to return those icon types, the module icon is more appropriate.
 561      if ($icon === $unknownicon || $icon === $htmlicon || $icon === $phpicon) {
 562          return null;
 563      }
 564  
 565      return $icon;
 566  }