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   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   * URL module main user interface
  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  require('../../config.php');
  27  require_once("$CFG->dirroot/mod/url/locallib.php");
  28  require_once($CFG->libdir . '/completionlib.php');
  29  
  30  $id       = optional_param('id', 0, PARAM_INT);        // Course module ID
  31  $u        = optional_param('u', 0, PARAM_INT);         // URL instance id
  32  $redirect = optional_param('redirect', 0, PARAM_BOOL);
  33  
  34  if ($u) {  // Two ways to specify the module
  35      $url = $DB->get_record('url', array('id'=>$u), '*', MUST_EXIST);
  36      $cm = get_coursemodule_from_instance('url', $url->id, $url->course, false, MUST_EXIST);
  37  
  38  } else {
  39      $cm = get_coursemodule_from_id('url', $id, 0, false, MUST_EXIST);
  40      $url = $DB->get_record('url', array('id'=>$cm->instance), '*', MUST_EXIST);
  41  }
  42  
  43  $course = $DB->get_record('course', array('id'=>$cm->course), '*', MUST_EXIST);
  44  
  45  require_course_login($course, true, $cm);
  46  $context = context_module::instance($cm->id);
  47  require_capability('mod/url:view', $context);
  48  
  49  $params = array(
  50      'context' => $context,
  51      'objectid' => $url->id
  52  );
  53  $event = \mod_url\event\course_module_viewed::create($params);
  54  $event->add_record_snapshot('course_modules', $cm);
  55  $event->add_record_snapshot('course', $course);
  56  $event->add_record_snapshot('url', $url);
  57  $event->trigger();
  58  
  59  // Update 'viewed' state if required by completion system
  60  $completion = new completion_info($course);
  61  $completion->set_module_viewed($cm);
  62  
  63  $PAGE->set_url('/mod/url/view.php', array('id' => $cm->id));
  64  
  65  // Make sure URL exists before generating output - some older sites may contain empty urls
  66  // Do not use PARAM_URL here, it is too strict and does not support general URIs!
  67  $exturl = trim($url->externalurl);
  68  if (empty($exturl) or $exturl === 'http://') {
  69      url_print_header($url, $cm, $course);
  70      url_print_heading($url, $cm, $course);
  71      url_print_intro($url, $cm, $course);
  72      notice(get_string('invalidstoredurl', 'url'), new moodle_url('/course/view.php', array('id'=>$cm->course)));
  73      die;
  74  }
  75  unset($exturl);
  76  
  77  $displaytype = url_get_final_display_type($url);
  78  if ($displaytype == RESOURCELIB_DISPLAY_OPEN) {
  79      // For 'open' links, we always redirect to the content - except if the user
  80      // just chose 'save and display' from the form then that would be confusing
  81      if (!isset($_SERVER['HTTP_REFERER']) || strpos($_SERVER['HTTP_REFERER'], 'modedit.php') === false) {
  82          $redirect = true;
  83      }
  84  }
  85  
  86  if ($redirect) {
  87      // coming from course page or url index page,
  88      // the redirection is needed for completion tracking and logging
  89      $fullurl = str_replace('&amp;', '&', url_get_full_url($url, $cm, $course));
  90  
  91      if (!course_get_format($course)->has_view_page()) {
  92          // If course format does not have a view page, add redirection delay with a link to the edit page.
  93          // Otherwise teacher is redirected to the external URL without any possibility to edit activity or course settings.
  94          $editurl = null;
  95          if (has_capability('moodle/course:manageactivities', $context)) {
  96              $editurl = new moodle_url('/course/modedit.php', array('update' => $cm->id));
  97              $edittext = get_string('editthisactivity');
  98          } else if (has_capability('moodle/course:update', $context->get_course_context())) {
  99              $editurl = new moodle_url('/course/edit.php', array('id' => $course->id));
 100              $edittext = get_string('editcoursesettings');
 101          }
 102          if ($editurl) {
 103              redirect($fullurl, html_writer::link($editurl, $edittext)."<br/>".
 104                      get_string('pageshouldredirect'), 10);
 105          }
 106      }
 107      redirect($fullurl);
 108  }
 109  
 110  switch ($displaytype) {
 111      case RESOURCELIB_DISPLAY_EMBED:
 112          url_display_embed($url, $cm, $course);
 113          break;
 114      case RESOURCELIB_DISPLAY_FRAME:
 115          url_display_frame($url, $cm, $course);
 116          break;
 117      default:
 118          url_print_workaround($url, $cm, $course);
 119          break;
 120  }