course/view.php

   1 <?php
   2
   3 //  Display the course home page.
   4
   5     require_once('../config.php');
   6     require_once('lib.php');
   7     require_once($CFG->libdir.'/completionlib.php');
   8
   9     $id          = optional_param('id', 0, PARAM_INT);
  10     $name        = optional_param('name', '', PARAM_TEXT);
  11     $edit        = optional_param('edit', -1, PARAM_BOOL);
  12     $hide        = optional_param('hide', 0, PARAM_INT);
  13     $show        = optional_param('show', 0, PARAM_INT);
  14     $idnumber    = optional_param('idnumber', '', PARAM_RAW);
  15     $sectionid   = optional_param('sectionid', 0, PARAM_INT);
  16     $section     = optional_param('section', 0, PARAM_INT);
  17     $move        = optional_param('move', 0, PARAM_INT);
  18     $marker      = optional_param('marker',-1 , PARAM_INT);
  19     $switchrole  = optional_param('switchrole',-1, PARAM_INT); // Deprecated, use course/switchrole.php instead.
  20     $return      = optional_param('return', 0, PARAM_LOCALURL);
  21
  22     $params = array();
  23     if (!empty($name)) {
  24         $params = array('shortname' => $name);
  25     } else if (!empty($idnumber)) {
  26         $params = array('idnumber' => $idnumber);
  27     } else if (!empty($id)) {
  28         $params = array('id' => $id);
  29     }else {
  30         print_error('unspecifycourseid', 'error');
  31     }
  32
  33     $course = $DB->get_record('course', $params, '*', MUST_EXIST);
  34
  35     $urlparams = array('id' => $course->id);
  36
  37     // Sectionid should get priority over section number
  38     if ($sectionid) {
  39         $section = $DB->get_field('course_sections', 'section', array('id' => $sectionid, 'course' => $course->id), MUST_EXIST);
  40     }
  41     if ($section) {
  42         $urlparams['section'] = $section;
  43     }
  44
  45     $PAGE->set_url('/course/view.php', $urlparams); // Defined here to avoid notices on errors etc
  46
  47     // Prevent caching of this page to stop confusion when changing page after making AJAX changes
  48     $PAGE->set_cacheable(false);
  49
  50     context_helper::preload_course($course->id);
  51     $context = context_course::instance($course->id, MUST_EXIST);
  52
  53     // Remove any switched roles before checking login
  54     if ($switchrole == 0 && confirm_sesskey()) {
  55         role_switch($switchrole, $context);
  56     }
  57
  58     require_login($course);
  59
  60     // Switchrole - sanity check in cost-order...
  61     $reset_user_allowed_editing = false;
  62     if ($switchrole > 0 && confirm_sesskey() &&
  63         has_capability('moodle/role:switchroles', $context)) {
  64         // is this role assignable in this context?
  65         // inquiring minds want to know...
  66         $aroles = get_switchable_roles($context);
  67         if (is_array($aroles) && isset($aroles[$switchrole])) {
  68             role_switch($switchrole, $context);
  69             // Double check that this role is allowed here
  70             require_login($course);
  71         }
  72         // reset course page state - this prevents some weird problems ;-)
  73         $USER->activitycopy = false;
  74         $USER->activitycopycourse = NULL;
  75         unset($USER->activitycopyname);
  76         unset($SESSION->modform);
  77         $USER->editing = 0;
  78         $reset_user_allowed_editing = true;
  79     }
  80
  81     //If course is hosted on an external server, redirect to corresponding
  82     //url with appropriate authentication attached as parameter
  83     if (file_exists($CFG->dirroot .'/course/externservercourse.php')) {
  84         include $CFG->dirroot .'/course/externservercourse.php';
  85         if (function_exists('extern_server_course')) {
  86             if ($extern_url = extern_server_course($course)) {
  87                 redirect($extern_url);
  88             }
  89         }
  90     }
  91
  92
  93     require_once($CFG->dirroot.'/calendar/lib.php');    /// This is after login because it needs $USER
  94
  95     // Must set layout before gettting section info. See MDL-47555.
  96     $PAGE->set_pagelayout('course');
  97
  98     if ($section and $section > 0) {
  99
 100         // Get section details and check it exists.
 101         $modinfo = get_fast_modinfo($course);
 102         $coursesections = $modinfo->get_section_info($section, MUST_EXIST);
 103
 104         // Check user is allowed to see it.
 105         if (!$coursesections->uservisible) {
 106             // Check if coursesection has conditions affecting availability and if
 107             // so, output availability info.
 108             if ($coursesections->visible && $coursesections->availableinfo) {
 109                 $sectionname     = get_section_name($course, $coursesections);
 110                 $message = get_string('notavailablecourse', '', $sectionname);
 111                 redirect(course_get_url($course), $message, null, \core\output\notification::NOTIFY_ERROR);
 112             } else {
 113                 // Note: We actually already know they don't have this capability
 114                 // or uservisible would have been true; this is just to get the
 115                 // correct error message shown.
 116                 require_capability('moodle/course:viewhiddensections', $context);
 117             }
 118         }
 119     }
 120
 121     // Fix course format if it is no longer installed
 122     $format = course_get_format($course);
 123     $course->format = $format->get_format();
 124
 125     $PAGE->set_pagetype('course-view-' . $course->format);
 126     $PAGE->set_other_editing_capability('moodle/course:update');
 127     $PAGE->set_other_editing_capability('moodle/course:manageactivities');
 128     $PAGE->set_other_editing_capability('moodle/course:activityvisibility');
 129     if (course_format_uses_sections($course->format)) {
 130         $PAGE->set_other_editing_capability('moodle/course:sectionvisibility');
 131         $PAGE->set_other_editing_capability('moodle/course:movesections');
 132     }
 133
 134     // Preload course format renderer before output starts.
 135     // This is a little hacky but necessary since
 136     // format.php is not included until after output starts
 137     $format->get_renderer($PAGE);
 138
 139     if ($reset_user_allowed_editing) {
 140         // ugly hack
 141         unset($PAGE->_user_allowed_editing);
 142     }
 143
 144     if (!isset($USER->editing)) {
 145         $USER->editing = 0;
 146     }
 147     if ($PAGE->user_allowed_editing()) {
 148         if (($edit == 1) and confirm_sesskey()) {
 149             $USER->editing = 1;
 150             // Redirect to site root if Editing is toggled on frontpage
 151             if ($course->id == SITEID) {
 152                 redirect($CFG->wwwroot .'/?redirect=0');
 153             } else if (!empty($return)) {
 154                 redirect($CFG->wwwroot . $return);
 155             } else {
 156                 $url = new moodle_url($PAGE->url, array('notifyeditingon' => 1));
 157                 redirect($url);
 158             }
 159         } else if (($edit == 0) and confirm_sesskey()) {
 160             $USER->editing = 0;
 161             if(!empty($USER->activitycopy) && $USER->activitycopycourse == $course->id) {
 162                 $USER->activitycopy       = false;
 163                 $USER->activitycopycourse = NULL;
 164             }
 165             // Redirect to site root if Editing is toggled on frontpage
 166             if ($course->id == SITEID) {
 167                 redirect($CFG->wwwroot .'/?redirect=0');
 168             } else if (!empty($return)) {
 169                 redirect($CFG->wwwroot . $return);
 170             } else {
 171                 redirect($PAGE->url);
 172             }
 173         }
 174
 175         if (has_capability('moodle/course:sectionvisibility', $context)) {
 176             if ($hide && confirm_sesskey()) {
 177                 set_section_visible($course->id, $hide, '0');
 178                 redirect($PAGE->url);
 179             }
 180
 181             if ($show && confirm_sesskey()) {
 182                 set_section_visible($course->id, $show, '1');
 183                 redirect($PAGE->url);
 184             }
 185         }
 186
 187         if (!empty($section) && !empty($move) &&
 188                 has_capability('moodle/course:movesections', $context) && confirm_sesskey()) {
 189             $destsection = $section + $move;
 190             if (move_section_to($course, $section, $destsection)) {
 191                 if ($course->id == SITEID) {
 192                     redirect($CFG->wwwroot . '/?redirect=0');
 193                 } else {
 194                     redirect(course_get_url($course));
 195                 }
 196             } else {
 197                 echo $OUTPUT->notification('An error occurred while moving a section');
 198             }
 199         }
 200     } else {
 201         $USER->editing = 0;
 202     }
 203
 204     $SESSION->fromdiscussion = $PAGE->url->out(false);
 205
 206
 207     if ($course->id == SITEID) {
 208         // This course is not a real course.
 209         redirect($CFG->wwwroot .'/');
 210     }
 211
 212     // Determine whether the user has permission to download course content.
 213     $candownloadcourse = \core\content::can_export_context($context, $USER);
 214
 215     // We are currently keeping the button here from 1.x to help new teachers figure out
 216     // what to do, even though the link also appears in the course admin block.  It also
 217     // means you can back out of a situation where you removed the admin block. :)
 218     if ($PAGE->user_allowed_editing()) {
 219         $buttons = $OUTPUT->edit_button($PAGE->url);
 220         $PAGE->set_button($buttons);
 221     } else if ($candownloadcourse) {
 222         // Show the download course content button if user has permission to access it.
 223         // Only showing this if user doesn't have edit rights, since those who do will access it via the actions menu.
 224         $buttonattr = \core_course\output\content_export_link::get_attributes($context);
 225         $button = new single_button($buttonattr->url, $buttonattr->displaystring, 'post', false, $buttonattr->elementattributes);
 226         $PAGE->set_button($OUTPUT->render($button));
 227     }
 228
 229     // If viewing a section, make the title more specific
 230     if ($section and $section > 0 and course_format_uses_sections($course->format)) {
 231         $sectionname = get_string('sectionname', "format_$course->format");
 232         $sectiontitle = get_section_name($course, $section);
 233         $PAGE->set_title(get_string('coursesectiontitle', 'moodle', array('course' => $course->fullname, 'sectiontitle' => $sectiontitle, 'sectionname' => $sectionname)));
 234     } else {
 235         $PAGE->set_title(get_string('coursetitle', 'moodle', array('course' => $course->fullname)));
 236     }
 237
 238     $PAGE->set_heading($course->fullname);
 239     echo $OUTPUT->header();
 240
 241     if ($USER->editing == 1) {
 242
 243         // MDL-65321 The backup libraries are quite heavy, only require the bare minimum.
 244         require_once($CFG->dirroot . '/backup/util/helper/async_helper.class.php');
 245
 246         if (async_helper::is_async_pending($id, 'course', 'backup')) {
 247             echo $OUTPUT->notification(get_string('pendingasyncedit', 'backup'), 'warning');
 248         }
 249     }
 250
 251     // Course wrapper start.
 252     echo html_writer::start_tag('div', array('class'=>'course-content'));
 253
 254     // make sure that section 0 exists (this function will create one if it is missing)
 255     course_create_sections_if_missing($course, 0);
 256
 257     // get information about course modules and existing module types
 258     // format.php in course formats may rely on presence of these variables
 259     $modinfo = get_fast_modinfo($course);
 260     $modnames = get_module_types_names();
 261     $modnamesplural = get_module_types_names(true);
 262     $modnamesused = $modinfo->get_used_module_names();
 263     $mods = $modinfo->get_cms();
 264     $sections = $modinfo->get_section_info_all();
 265
 266     // CAUTION, hacky fundamental variable defintion to follow!
 267     // Note that because of the way course fromats are constructed though
 268     // inclusion we pass parameters around this way..
 269     $displaysection = $section;
 270
 271     // Include the actual course format.
 272     require($CFG->dirroot .'/course/format/'. $course->format .'/format.php');
 273     // Content wrapper end.
 274
 275     echo html_writer::end_tag('div');
 276
 277     // Trigger course viewed event.
 278     // We don't trust $context here. Course format inclusion above executes in the global space. We can't assume
 279     // anything after that point.
 280     course_view(context_course::instance($course->id), $section);
 281
 282     // Include course AJAX
 283     include_course_ajax($course, $modnamesused);
 284
 285     // If available, include the JS to prepare the download course content modal.
 286     if ($candownloadcourse) {
 287         $PAGE->requires->js_call_amd('core_course/downloadcontent', 'init');
 288     }
 289
 290     // Load the view JS module if completion tracking is enabled for this course.
 291     $completion = new completion_info($course);
 292     if ($completion->is_enabled()) {
 293         $PAGE->requires->js_call_amd('core_course/view', 'init');
 294     }
 295
 296     echo $OUTPUT->footer();