course/view.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * Display the course home page.
  19  *
  20  * @copyright 1999 Martin Dougiamas  http://dougiamas.com
  21  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  22  * @package core_course
  23  */
  24
  25 require_once('../config.php');
  26 require_once('lib.php');
  27 require_once($CFG->libdir.'/completionlib.php');
  28
  29 redirect_if_major_upgrade_required();
  30
  31 $id = optional_param('id', 0, PARAM_INT);
  32 $name = optional_param('name', '', PARAM_TEXT);
  33 $edit = optional_param('edit', -1, PARAM_BOOL);
  34 $hide = optional_param('hide', 0, PARAM_INT);
  35 $show = optional_param('show', 0, PARAM_INT);
  36 $duplicatesection = optional_param('duplicatesection', 0, PARAM_INT);
  37 $idnumber = optional_param('idnumber', '', PARAM_RAW);
  38 $sectionid = optional_param('sectionid', 0, PARAM_INT);
  39 $section = optional_param('section', 0, PARAM_INT);
  40 $expandsection = optional_param('expandsection', -1, PARAM_INT);
  41 $move = optional_param('move', 0, PARAM_INT);
  42 $marker = optional_param('marker', -1 , PARAM_INT);
  43 $switchrole = optional_param('switchrole', -1, PARAM_INT); // Deprecated, use course/switchrole.php instead.
  44 $return = optional_param('return', 0, PARAM_LOCALURL);
  45
  46 $params = [];
  47 if (!empty($name)) {
  48     $params = ['shortname' => $name];
  49 } else if (!empty($idnumber)) {
  50     $params = ['idnumber' => $idnumber];
  51 } else if (!empty($id)) {
  52     $params = ['id' => $id];
  53 } else {
  54     throw new \moodle_exception('unspecifycourseid', 'error');
  55 }
  56
  57 $course = $DB->get_record('course', $params, '*', MUST_EXIST);
  58
  59 $urlparams = ['id' => $course->id];
  60
  61 // Sectionid should get priority over section number.
  62 if ($sectionid) {
  63     $section = $DB->get_field('course_sections', 'section', ['id' => $sectionid, 'course' => $course->id], MUST_EXIST);
  64 }
  65 if ($section) {
  66     $urlparams['section'] = $section;
  67 }
  68 if ($expandsection !== -1) {
  69     $urlparams['expandsection'] = $expandsection;
  70 }
  71
  72 $PAGE->set_url('/course/view.php', $urlparams); // Defined here to avoid notices on errors etc.
  73
  74 // Prevent caching of this page to stop confusion when changing page after making AJAX changes.
  75 $PAGE->set_cacheable(false);
  76
  77 context_helper::preload_course($course->id);
  78 $context = context_course::instance($course->id, MUST_EXIST);
  79
  80 // Remove any switched roles before checking login.
  81 if ($switchrole == 0 && confirm_sesskey()) {
  82     role_switch($switchrole, $context);
  83 }
  84
  85 require_login($course);
  86
  87 // Switchrole - sanity check in cost-order...
  88 $resetuserallowedediting = false;
  89 if ($switchrole > 0 && confirm_sesskey() &&
  90     has_capability('moodle/role:switchroles', $context)) {
  91     // Is this role assignable in this context?
  92     // Inquiring minds want to know.
  93     $aroles = get_switchable_roles($context);
  94     if (is_array($aroles) && isset($aroles[$switchrole])) {
  95         role_switch($switchrole, $context);
  96         // Double check that this role is allowed here.
  97         require_login($course);
  98     }
  99     // Reset course page state. This prevents some weird problems.
 100     $USER->activitycopy = false;
 101     $USER->activitycopycourse = null;
 102     unset($USER->activitycopyname);
 103     unset($SESSION->modform);
 104     $USER->editing = 0;
 105     $resetuserallowedediting = true;
 106 }
 107
 108 // If course is hosted on an external server, redirect to corresponding
 109 // url with appropriate authentication attached as parameter.
 110 if (file_exists($CFG->dirroot . '/course/externservercourse.php')) {
 111     include($CFG->dirroot . '/course/externservercourse.php');
 112     if (function_exists('extern_server_course')) {
 113         if ($externurl = extern_server_course($course)) {
 114             redirect($externurl);
 115         }
 116     }
 117 }
 118
 119 require_once($CFG->dirroot.'/calendar/lib.php'); // This is after login because it needs $USER.
 120
 121 // Must set layout before gettting section info. See MDL-47555.
 122 $PAGE->set_pagelayout('course');
 123 $PAGE->add_body_class('limitedwidth');
 124
 125 if ($section && $section > 0) {
 126
 127     // Get section details and check it exists.
 128     $modinfo = get_fast_modinfo($course);
 129     $coursesections = $modinfo->get_section_info($section, MUST_EXIST);
 130
 131     // Check user is allowed to see it.
 132     if (!$coursesections->uservisible) {
 133         // Check if coursesection has conditions affecting availability and if
 134         // so, output availability info.
 135         if ($coursesections->visible && $coursesections->availableinfo) {
 136             $sectionname = get_section_name($course, $coursesections);
 137             $message = get_string('notavailablecourse', '', $sectionname);
 138             redirect(course_get_url($course), $message, null, \core\output\notification::NOTIFY_ERROR);
 139         } else {
 140             // Note: We actually already know they don't have this capability
 141             // or uservisible would have been true; this is just to get the
 142             // correct error message shown.
 143             require_capability('moodle/course:viewhiddensections', $context);
 144         }
 145     }
 146 }
 147
 148 // Fix course format if it is no longer installed.
 149 $format = course_get_format($course);
 150 $course->format = $format->get_format();
 151
 152 $PAGE->set_pagetype('course-view-' . $course->format);
 153 $PAGE->set_other_editing_capability('moodle/course:update');
 154 $PAGE->set_other_editing_capability('moodle/course:manageactivities');
 155 $PAGE->set_other_editing_capability('moodle/course:activityvisibility');
 156 if (course_format_uses_sections($course->format)) {
 157     $PAGE->set_other_editing_capability('moodle/course:sectionvisibility');
 158     $PAGE->set_other_editing_capability('moodle/course:movesections');
 159 }
 160
 161 // Preload course format renderer before output starts.
 162 // This is a little hacky but necessary since
 163 // format.php is not included until after output starts.
 164 $renderer = $format->get_renderer($PAGE);
 165
 166 if ($resetuserallowedediting) {
 167     // Ugly hack.
 168     unset($PAGE->_user_allowed_editing);
 169 }
 170
 171 if (!isset($USER->editing)) {
 172     $USER->editing = 0;
 173 }
 174 if ($PAGE->user_allowed_editing()) {
 175     if (($edit == 1) && confirm_sesskey()) {
 176         $USER->editing = 1;
 177         // Redirect to site root if Editing is toggled on frontpage.
 178         if ($course->id == SITEID) {
 179             redirect($CFG->wwwroot .'/?redirect=0');
 180         } else if (!empty($return)) {
 181             redirect($CFG->wwwroot . $return);
 182         } else {
 183             $url = new moodle_url($PAGE->url, ['notifyeditingon' => 1]);
 184             redirect($url);
 185         }
 186     } else if (($edit == 0) && confirm_sesskey()) {
 187         $USER->editing = 0;
 188         if (!empty($USER->activitycopy) && $USER->activitycopycourse == $course->id) {
 189             $USER->activitycopy = false;
 190             $USER->activitycopycourse = null;
 191         }
 192         // Redirect to site root if Editing is toggled on frontpage.
 193         if ($course->id == SITEID) {
 194             redirect($CFG->wwwroot .'/?redirect=0');
 195         } else if (!empty($return)) {
 196             redirect($CFG->wwwroot . $return);
 197         } else {
 198             redirect($PAGE->url);
 199         }
 200     }
 201
 202     if (has_capability('moodle/course:sectionvisibility', $context)) {
 203         if ($hide && confirm_sesskey()) {
 204             set_section_visible($course->id, $hide, '0');
 205             redirect($PAGE->url);
 206         }
 207
 208         if ($show && confirm_sesskey()) {
 209             set_section_visible($course->id, $show, '1');
 210             redirect($PAGE->url);
 211         }
 212     }
 213
 214     if (
 215         !empty($section) && !empty($coursesections) && !empty($duplicatesection)
 216         && has_capability('moodle/course:update', $context) && confirm_sesskey()
 217     ) {
 218         $newsection = $format->duplicate_section($coursesections);
 219         redirect(course_get_url($course, $newsection->section));
 220     }
 221
 222     if (!empty($section) && !empty($move) &&
 223             has_capability('moodle/course:movesections', $context) && confirm_sesskey()) {
 224         $destsection = $section + $move;
 225         if (move_section_to($course, $section, $destsection)) {
 226             if ($course->id == SITEID) {
 227                 redirect($CFG->wwwroot . '/?redirect=0');
 228             } else {
 229                 if ($format->get_course_display() == COURSE_DISPLAY_MULTIPAGE) {
 230                     redirect(course_get_url($course));
 231                 } else {
 232                     redirect(course_get_url($course, $destsection));
 233                 }
 234             }
 235         } else {
 236             echo $OUTPUT->notification('An error occurred while moving a section');
 237         }
 238     }
 239 } else {
 240     $USER->editing = 0;
 241 }
 242
 243 $SESSION->fromdiscussion = $PAGE->url->out(false);
 244
 245
 246 if ($course->id == SITEID) {
 247     // This course is not a real course.
 248     redirect($CFG->wwwroot .'/?redirect=0');
 249 }
 250
 251 // Determine whether the user has permission to download course content.
 252 $candownloadcourse = \core\content::can_export_context($context, $USER);
 253
 254 // We are currently keeping the button here from 1.x to help new teachers figure out
 255 // what to do, even though the link also appears in the course admin block.  It also
 256 // means you can back out of a situation where you removed the admin block.
 257 if ($PAGE->user_allowed_editing()) {
 258     $buttons = $OUTPUT->edit_button($PAGE->url);
 259     $PAGE->set_button($buttons);
 260 }
 261
 262 $editingtitle = '';
 263 if ($PAGE->user_is_editing()) {
 264     // Append this to the page title's lang string to get its equivalent when editing mode is turned on.
 265     $editingtitle = 'editing';
 266 }
 267
 268 // If viewing a section, make the title more specific.
 269 if ($section && $section > 0 && course_format_uses_sections($course->format)) {
 270     $sectionname = get_string('sectionname', "format_$course->format");
 271     $sectiontitle = get_section_name($course, $section);
 272     $PAGE->set_title(
 273         get_string(
 274             'coursesectiontitle' . $editingtitle,
 275             'moodle',
 276             ['course' => $course->fullname, 'sectiontitle' => $sectiontitle, 'sectionname' => $sectionname]
 277         )
 278     );
 279 } else {
 280     $PAGE->set_title(get_string('coursetitle' . $editingtitle, 'moodle', ['course' => $course->fullname]));
 281 }
 282
 283 // Add bulk editing control.
 284 $bulkbutton = $renderer->bulk_editing_button($format);
 285 if (!empty($bulkbutton)) {
 286     $PAGE->add_header_action($bulkbutton);
 287 }
 288
 289 $PAGE->set_heading($course->fullname);
 290 echo $OUTPUT->header();
 291
 292 // Show communication room status notification.
 293 if (core_communication\api::is_available() && has_capability('moodle/course:update', $context)) {
 294     $communication = \core_communication\api::load_by_instance(
 295         $context,
 296         'core_course',
 297         'coursecommunication',
 298         $course->id
 299     );
 300     $communication->show_communication_room_status_notification();
 301 }
 302
 303 if ($USER->editing == 1) {
 304
 305     // MDL-65321 The backup libraries are quite heavy, only require the bare minimum.
 306     require_once($CFG->dirroot . '/backup/util/helper/async_helper.class.php');
 307
 308     if (async_helper::is_async_pending($id, 'course', 'backup')) {
 309         echo $OUTPUT->notification(get_string('pendingasyncedit', 'backup'), 'warning');
 310     }
 311 }
 312
 313 // Course wrapper start.
 314 echo html_writer::start_tag('div', ['class' => 'course-content']);
 315
 316 // Make sure that section 0 exists (this function will create one if it is missing).
 317 course_create_sections_if_missing($course, 0);
 318
 319 // Get information about course modules and existing module types.
 320 // format.php in course formats may rely on presence of these variables.
 321 $modinfo = get_fast_modinfo($course);
 322 $modnames = get_module_types_names();
 323 $modnamesplural = get_module_types_names(true);
 324 $modnamesused = $modinfo->get_used_module_names();
 325 $mods = $modinfo->get_cms();
 326 $sections = $modinfo->get_section_info_all();
 327
 328 // CAUTION, hacky fundamental variable defintion to follow!
 329 // Note that because of the way course fromats are constructed though
 330 // inclusion we pass parameters around this way.
 331 $displaysection = $section;
 332
 333 // Include course AJAX.
 334 include_course_ajax($course, $modnamesused);
 335
 336 // Include the actual course format.
 337 require($CFG->dirroot .'/course/format/'. $course->format .'/format.php');
 338 // Content wrapper end.
 339
 340 echo html_writer::end_tag('div');
 341
 342 // Trigger course viewed event.
 343 // We don't trust $context here. Course format inclusion above executes in the global space. We can't assume
 344 // anything after that point.
 345 course_view(context_course::instance($course->id), $section);
 346
 347 // If available, include the JS to prepare the download course content modal.
 348 if ($candownloadcourse) {
 349     $PAGE->requires->js_call_amd('core_course/downloadcontent', 'init');
 350 }
 351
 352 // Load the view JS module if completion tracking is enabled for this course.
 353 $completion = new completion_info($course);
 354 if ($completion->is_enabled()) {
 355     $PAGE->requires->js_call_amd('core_course/view', 'init');
 356 }
 357
 358 echo $OUTPUT->footer();