mod/url/view.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  * 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 }