lib/pagelib.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  * This file contains the moodle_page class. There is normally a single instance
  19  * of this class in the $PAGE global variable. This class is a central repository
  20  * of information about the page we are building up to send back to the user.
  21  *
  22  * @package core
  23  * @category page
  24  * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
  25  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26  */
  27
  28 defined('MOODLE_INTERNAL') || die();
  29
  30 /**
  31  * $PAGE is a central store of information about the current page we are
  32  * generating in response to the user's request.
  33  *
  34  * It does not do very much itself
  35  * except keep track of information, however, it serves as the access point to
  36  * some more significant components like $PAGE->theme, $PAGE->requires,
  37  * $PAGE->blocks, etc.
  38  *
  39  * @copyright 2009 Tim Hunt
  40  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  41  * @since Moodle 2.0
  42  * @package core
  43  * @category page
  44  *
  45  * The following properties are alphabetical. Please keep it that way so that its
  46  * easy to maintain.
  47  *
  48  * @property-read string $activityname The type of activity we are in, for example 'forum' or 'quiz'.
  49  *      Will be null if this page is not within a module.
  50  * @property-read stdClass $activityrecord The row from the activities own database table (for example
  51  *      the forum or quiz table) that this page belongs to. Will be null
  52  *      if this page is not within a module.
  53  * @property-read array $alternativeversions Mime type => object with ->url and ->title.
  54  * @property-read block_manager $blocks The blocks manager object for this page.
  55  * @property-read array $blockmanipulations
  56  * @property-read string $bodyclasses A string to use within the class attribute on the body tag.
  57  * @property-read string $bodyid A string to use as the id of the body tag.
  58  * @property-read string $button The HTML to go where the Turn editing on button normally goes.
  59  * @property-read bool $cacheable Defaults to true. Set to false to stop the page being cached at all.
  60  * @property-read array $categories An array of all the categories the page course belongs to,
  61  *      starting with the immediately containing category, and working out to
  62  *      the top-level category. This may be the empty array if we are in the
  63  *      front page course.
  64  * @property-read mixed $category The category that the page course belongs to.
  65  * @property-read cm_info $cm The course_module that this page belongs to. Will be null
  66  *      if this page is not within a module. This is a full cm object, as loaded
  67  *      by get_coursemodule_from_id or get_coursemodule_from_instance,
  68  *      so the extra modname and name fields are present.
  69  * @property-read context $context The main context to which this page belongs.
  70  * @property-read stdClass $course The current course that we are inside - a row from the
  71  *      course table. (Also available as $COURSE global.) If we are not inside
  72  *      an actual course, this will be the site course.
  73  * @property-read string $devicetypeinuse The name of the device type in use
  74  * @property-read string $docspath The path to the Moodle docs for this page.
  75  * @property-read string $focuscontrol The id of the HTML element to be focused when the page has loaded.
  76  * @property-read bool $headerprinted True if the page header has already been printed.
  77  * @property-read string $heading The main heading that should be displayed at the top of the <body>.
  78  * @property-read string $headingmenu The menu (or actions) to display in the heading
  79  * @property-read array $layout_options An arrays with options for the layout file.
  80  * @property-read array $legacythemeinuse True if the legacy browser theme is in use.
  81  * @property-read navbar $navbar The navbar object used to display the navbar
  82  * @property-read global_navigation $navigation The navigation structure for this page.
  83  * @property-read xhtml_container_stack $opencontainers Tracks XHTML tags on this page that have been opened but not closed.
  84  *      mainly for internal use by the rendering code.
  85  * @property-read string $pagelayout The general type of page this is. For example 'normal', 'popup', 'home'.
  86  *      Allows the theme to display things differently, if it wishes to.
  87  * @property-read string $pagetype The page type string, should be used as the id for the body tag in the theme.
  88  * @property-read int $periodicrefreshdelay The periodic refresh delay to use with meta refresh
  89  * @property-read page_requirements_manager $requires Tracks the JavaScript, CSS files, etc. required by this page.
  90  * @property-read settings_navigation $settingsnav The settings navigation
  91  * @property-read int $state One of the STATE_... constants
  92  * @property-read string $subpage The subpage identifier, if any.
  93  * @property-read theme_config $theme The theme for this page.
  94  * @property-read string $title The title that should go in the <head> section of the HTML of this page.
  95  * @property-read moodle_url $url The moodle url object for this page.
  96  */
  97 class moodle_page {
  98
  99     /** The state of the page before it has printed the header **/
 100     const STATE_BEFORE_HEADER = 0;
 101
 102     /** The state the page is in temporarily while the header is being printed **/
 103     const STATE_PRINTING_HEADER = 1;
 104
 105     /** The state the page is in while content is presumably being printed **/
 106     const STATE_IN_BODY = 2;
 107
 108     /**
 109      * The state the page is when the footer has been printed and its function is
 110      * complete.
 111      */
 112     const STATE_DONE = 3;
 113
 114     /**
 115      * @var int The current state of the page. The state a page is within
 116      * determines what actions are possible for it.
 117      */
 118     protected $_state = self::STATE_BEFORE_HEADER;
 119
 120     /**
 121      * @var stdClass The course currently associated with this page.
 122      * If not has been provided the front page course is used.
 123      */
 124     protected $_course = null;
 125
 126     /**
 127      * @var cm_info If this page belongs to a module, this is the cm_info module
 128      * description object.
 129      */
 130     protected $_cm = null;
 131
 132     /**
 133      * @var stdClass If $_cm is not null, then this will hold the corresponding
 134      * row from the modname table. For example, if $_cm->modname is 'quiz', this
 135      * will be a row from the quiz table.
 136      */
 137     protected $_module = null;
 138
 139     /**
 140      * @var context The context that this page belongs to.
 141      */
 142     protected $_context = null;
 143
 144     /**
 145      * @var array This holds any categories that $_course belongs to, starting with the
 146      * particular category it belongs to, and working out through any parent
 147      * categories to the top level. These are loaded progressively, if needed.
 148      * There are three states. $_categories = null initially when nothing is
 149      * loaded; $_categories = array($id => $cat, $parentid => null) when we have
 150      * loaded $_course->category, but not any parents; and a complete array once
 151      * everything is loaded.
 152      */
 153     protected $_categories = null;
 154
 155     /**
 156      * @var array An array of CSS classes that should be added to the body tag in HTML.
 157      */
 158     protected $_bodyclasses = array();
 159
 160     /**
 161      * @var string The title for the page. Used within the title tag in the HTML head.
 162      */
 163     protected $_title = '';
 164
 165     /**
 166      * @var string The string to use as the heading of the page. Shown near the top of the
 167      * page within most themes.
 168      */
 169     protected $_heading = '';
 170
 171     /**
 172      * @var string The pagetype is used to describe the page and defaults to a representation
 173      * of the physical path to the page e.g. my-index, mod-quiz-attempt
 174      */
 175     protected $_pagetype = null;
 176
 177     /**
 178      * @var string The pagelayout to use when displaying this page. The
 179      * pagelayout needs to have been defined by the theme in use, or one of its
 180      * parents. By default base is used however standard is the more common layout.
 181      * Note that this gets automatically set by core during operations like
 182      * require_login.
 183      */
 184     protected $_pagelayout = 'base';
 185
 186     /**
 187      * @var array List of theme layout options, these are ignored by core.
 188      * To be used in individual theme layout files only.
 189      */
 190     protected $_layout_options = null;
 191
 192     /**
 193      * @var string An optional arbitrary parameter that can be set on pages where the context
 194      * and pagetype is not enough to identify the page.
 195      */
 196     protected $_subpage = '';
 197
 198     /**
 199      * @var string Set a different path to use for the 'Moodle docs for this page' link.
 200      * By default, it uses the path of the file for instance mod/quiz/attempt.
 201      */
 202     protected $_docspath = null;
 203
 204     /**
 205      * @var string A legacy class that will be added to the body tag
 206      */
 207     protected $_legacyclass = null;
 208
 209     /**
 210      * @var moodle_url The URL for this page. This is mandatory and must be set
 211      * before output is started.
 212      */
 213     protected $_url = null;
 214
 215     /**
 216      * @var array An array of links to alternative versions of this page.
 217      * Primarily used for RSS versions of the current page.
 218      */
 219     protected $_alternateversions = array();
 220
 221     /**
 222      * @var block_manager The blocks manager for this page. It is responsible for
 223      * the blocks and there content on this page.
 224      */
 225     protected $_blocks = null;
 226
 227     /**
 228      * @var page_requirements_manager Page requirements manager. It is responsible
 229      * for all JavaScript and CSS resources required by this page.
 230      */
 231     protected $_requires = null;
 232
 233     /**
 234      * @var string The capability required by the user in order to edit blocks
 235      * and block settings on this page.
 236      */
 237     protected $_blockseditingcap = 'moodle/site:manageblocks';
 238
 239     /**
 240      * @var bool An internal flag to record when block actions have been processed.
 241      * Remember block actions occur on the current URL and it is important that
 242      * even they are never executed more than once.
 243      */
 244     protected $_block_actions_done = false;
 245
 246     /**
 247      * @var array An array of any other capabilities the current user must have
 248      * in order to editing the page and/or its content (not just blocks).
 249      */
 250     protected $_othereditingcaps = array();
 251
 252     /**
 253      * @var bool Sets whether this page should be cached by the browser or not.
 254      * If it is set to true (default) the page is served with caching headers.
 255      */
 256     protected $_cacheable = true;
 257
 258     /**
 259      * @var string Can be set to the ID of an element on the page, if done that
 260      * element receives focus when the page loads.
 261      */
 262     protected $_focuscontrol = '';
 263
 264     /**
 265      * @var string HTML to go where the turn on editing button is located. This
 266      * is nearly a legacy item and not used very often any more.
 267      */
 268     protected $_button = '';
 269
 270     /**
 271      * @var theme_config The theme to use with this page. This has to be properly
 272      * initialised via {@link moodle_page::initialise_theme_and_output()} which
 273      * happens magically before any operation that requires it.
 274      */
 275     protected $_theme = null;
 276
 277     /**
 278      * @var global_navigation Contains the global navigation structure.
 279      */
 280     protected $_navigation = null;
 281
 282     /**
 283      * @var settings_navigation Contains the settings navigation structure.
 284      */
 285     protected $_settingsnav = null;
 286
 287     /**
 288      * @var navbar Contains the navbar structure.
 289      */
 290     protected $_navbar = null;
 291
 292     /**
 293      * @var string The menu (or actions) to display in the heading.
 294      */
 295     protected $_headingmenu = null;
 296
 297     /**
 298      * @var array stack trace. Then the theme is initialised, we save the stack
 299      * trace, for use in error messages.
 300      */
 301     protected $_wherethemewasinitialised = null;
 302
 303     /**
 304      * @var xhtml_container_stack Tracks XHTML tags on this page that have been
 305      * opened but not closed.
 306      */
 307     protected $_opencontainers;
 308
 309     /**
 310      * @var int Sets the page to refresh after a given delay (in seconds) using
 311      * meta refresh in {@link standard_head_html()} in outputlib.php
 312      * If set to null(default) the page is not refreshed
 313      */
 314     protected $_periodicrefreshdelay = null;
 315
 316     /**
 317      * @var array Associative array of browser shortnames (as used by check_browser_version)
 318      * and their minimum required versions
 319      */
 320     protected $_legacybrowsers = array('MSIE' => 6.0);
 321
 322     /**
 323      * @var string Is set to the name of the device type in use.
 324      * This will we worked out when it is first used.
 325      */
 326     protected $_devicetypeinuse = null;
 327
 328     /**
 329      * @var bool Used to determine if HTTPS should be required for login.
 330      */
 331     protected $_https_login_required = false;
 332
 333     /**
 334      * @var bool Determines if popup notifications allowed on this page.
 335      * Code such as the quiz module disables popup notifications in situations
 336      * such as upgrading or completing a quiz.
 337      */
 338     protected $_popup_notification_allowed = true;
 339
 340     // Magic getter methods =============================================================
 341     // Due to the __get magic below, you normally do not call these as $PAGE->magic_get_x
 342     // methods, but instead use the $PAGE->x syntax.
 343
 344     /**
 345      * Please do not call this method directly, use the ->state syntax. {@link moodle_page::__get()}.
 346      * @return integer one of the STATE_XXX constants. You should not normally need
 347      * to use this in your code. It is intended for internal use by this class
 348      * and its friends like print_header, to check that everything is working as
 349      * expected. Also accessible as $PAGE->state.
 350      */
 351     protected function magic_get_state() {
 352         return $this->_state;
 353     }
 354
 355     /**
 356      * Please do not call this method directly, use the ->headerprinted syntax. {@link moodle_page::__get()}.
 357      * @return bool has the header already been printed?
 358      */
 359     protected function magic_get_headerprinted() {
 360         return $this->_state >= self::STATE_IN_BODY;
 361     }
 362
 363     /**
 364      * Please do not call this method directly, use the ->course syntax. {@link moodle_page::__get()}.
 365      * @return stdClass the current course that we are inside - a row from the
 366      * course table. (Also available as $COURSE global.) If we are not inside
 367      * an actual course, this will be the site course.
 368      */
 369     protected function magic_get_course() {
 370         global $SITE;
 371         if (is_null($this->_course)) {
 372             return $SITE;
 373         }
 374         return $this->_course;
 375     }
 376
 377     /**
 378      * Please do not call this method directly, use the ->cm syntax. {@link moodle_page::__get()}.
 379      * @return cm_info the course_module that this page belongs to. Will be null
 380      * if this page is not within a module. This is a full cm object, as loaded
 381      * by get_coursemodule_from_id or get_coursemodule_from_instance,
 382      * so the extra modname and name fields are present.
 383      */
 384     protected function magic_get_cm() {
 385         return $this->_cm;
 386     }
 387
 388     /**
 389      * Please do not call this method directly, use the ->activityrecord syntax. {@link moodle_page::__get()}.
 390      * @return stdClass the row from the activities own database table (for example
 391      * the forum or quiz table) that this page belongs to. Will be null
 392      * if this page is not within a module.
 393      */
 394     protected function magic_get_activityrecord() {
 395         if (is_null($this->_module) && !is_null($this->_cm)) {
 396             $this->load_activity_record();
 397         }
 398         return $this->_module;
 399     }
 400
 401     /**
 402      * Please do not call this method directly, use the ->activityname syntax. {@link moodle_page::__get()}.
 403      * @return string the The type of activity we are in, for example 'forum' or 'quiz'.
 404      * Will be null if this page is not within a module.
 405      */
 406     protected function magic_get_activityname() {
 407         if (is_null($this->_cm)) {
 408             return null;
 409         }
 410         return $this->_cm->modname;
 411     }
 412
 413     /**
 414      * Please do not call this method directly, use the ->category syntax. {@link moodle_page::__get()}.
 415      * @return stdClass the category that the page course belongs to. If there isn't one
 416      * (that is, if this is the front page course) returns null.
 417      */
 418     protected function magic_get_category() {
 419         $this->ensure_category_loaded();
 420         if (!empty($this->_categories)) {
 421             return reset($this->_categories);
 422         } else {
 423             return null;
 424         }
 425     }
 426
 427     /**
 428      * Please do not call this method directly, use the ->categories syntax. {@link moodle_page::__get()}.
 429      * @return array an array of all the categories the page course belongs to,
 430      * starting with the immediately containing category, and working out to
 431      * the top-level category. This may be the empty array if we are in the
 432      * front page course.
 433      */
 434     protected function magic_get_categories() {
 435         $this->ensure_categories_loaded();
 436         return $this->_categories;
 437     }
 438
 439     /**
 440      * Please do not call this method directly, use the ->context syntax. {@link moodle_page::__get()}.
 441      * @return context the main context to which this page belongs.
 442      */
 443     protected function magic_get_context() {
 444         if (is_null($this->_context)) {
 445             if (CLI_SCRIPT or NO_MOODLE_COOKIES) {
 446                 // Cli scripts work in system context, do not annoy devs with debug info.
 447                 // Very few scripts do not use cookies, we can safely use system as default context there.
 448             } else {
 449                 debugging('Coding problem: $PAGE->context was not set. You may have forgotten '
 450                     .'to call require_login() or $PAGE->set_context(). The page may not display '
 451                     .'correctly as a result');
 452             }
 453             $this->_context = context_system::instance();
 454         }
 455         return $this->_context;
 456     }
 457
 458     /**
 459      * Please do not call this method directly, use the ->pagetype syntax. {@link moodle_page::__get()}.
 460      * @return string e.g. 'my-index' or 'mod-quiz-attempt'.
 461      */
 462     protected function magic_get_pagetype() {
 463         global $CFG;
 464         if (is_null($this->_pagetype) || isset($CFG->pagepath)) {
 465             $this->initialise_default_pagetype();
 466         }
 467         return $this->_pagetype;
 468     }
 469
 470     /**
 471      * Please do not call this method directly, use the ->pagetype syntax. {@link moodle_page::__get()}.
 472      * @return string The id to use on the body tag, uses {@link magic_get_pagetype()}.
 473      */
 474     protected function magic_get_bodyid() {
 475         return 'page-'.$this->pagetype;
 476     }
 477
 478     /**
 479      * Please do not call this method directly, use the ->pagelayout syntax. {@link moodle_page::__get()}.
 480      * @return string the general type of page this is. For example 'standard', 'popup', 'home'.
 481      *      Allows the theme to display things differently, if it wishes to.
 482      */
 483     protected function magic_get_pagelayout() {
 484         return $this->_pagelayout;
 485     }
 486
 487     /**
 488      * Please do not call this method directly, use the ->layout_options syntax. {@link moodle_page::__get()}.
 489      * @return array returns arrays with options for layout file
 490      */
 491     protected function magic_get_layout_options() {
 492         if (!is_array($this->_layout_options)) {
 493             $this->_layout_options = $this->_theme->pagelayout_options($this->pagelayout);
 494         }
 495         return $this->_layout_options;
 496     }
 497
 498     /**
 499      * Please do not call this method directly, use the ->subpage syntax. {@link moodle_page::__get()}.
 500      * @return string The subpage identifier, if any.
 501      */
 502     protected function magic_get_subpage() {
 503         return $this->_subpage;
 504     }
 505
 506     /**
 507      * Please do not call this method directly, use the ->bodyclasses syntax. {@link moodle_page::__get()}.
 508      * @return string the class names to put on the body element in the HTML.
 509      */
 510     protected function magic_get_bodyclasses() {
 511         return implode(' ', array_keys($this->_bodyclasses));
 512     }
 513
 514     /**
 515      * Please do not call this method directly, use the ->title syntax. {@link moodle_page::__get()}.
 516      * @return string the title that should go in the <head> section of the HTML of this page.
 517      */
 518     protected function magic_get_title() {
 519         return $this->_title;
 520     }
 521
 522     /**
 523      * Please do not call this method directly, use the ->heading syntax. {@link moodle_page::__get()}.
 524      * @return string the main heading that should be displayed at the top of the <body>.
 525      */
 526     protected function magic_get_heading() {
 527         return $this->_heading;
 528     }
 529
 530     /**
 531      * Please do not call this method directly, use the ->heading syntax. {@link moodle_page::__get()}.
 532      * @return string The menu (or actions) to display in the heading
 533      */
 534     protected function magic_get_headingmenu() {
 535         return $this->_headingmenu;
 536     }
 537
 538     /**
 539      * Please do not call this method directly, use the ->docspath syntax. {@link moodle_page::__get()}.
 540      * @return string the path to the Moodle docs for this page.
 541      */
 542     protected function magic_get_docspath() {
 543         if (is_string($this->_docspath)) {
 544             return $this->_docspath;
 545         } else {
 546             return str_replace('-', '/', $this->pagetype);
 547         }
 548     }
 549
 550     /**
 551      * Please do not call this method directly, use the ->url syntax. {@link moodle_page::__get()}.
 552      * @return moodle_url the clean URL required to load the current page. (You
 553      * should normally use this in preference to $ME or $FULLME.)
 554      */
 555     protected function magic_get_url() {
 556         global $FULLME;
 557         if (is_null($this->_url)) {
 558             debugging('This page did not call $PAGE->set_url(...). Using '.s($FULLME), DEBUG_DEVELOPER);
 559             $this->_url = new moodle_url($FULLME);
 560             // Make sure the guessed URL cannot lead to dangerous redirects.
 561             $this->_url->remove_params('sesskey');
 562         }
 563         return new moodle_url($this->_url); // Return a clone for safety.
 564     }
 565
 566     /**
 567      * The list of alternate versions of this page.
 568      * @return array mime type => object with ->url and ->title.
 569      */
 570     protected function magic_get_alternateversions() {
 571         return $this->_alternateversions;
 572     }
 573
 574     /**
 575      * Please do not call this method directly, use the ->blocks syntax. {@link moodle_page::__get()}.
 576      * @return block_manager the blocks manager object for this page.
 577      */
 578     protected function magic_get_blocks() {
 579         global $CFG;
 580         if (is_null($this->_blocks)) {
 581             if (!empty($CFG->blockmanagerclass)) {
 582                 if (!empty($CFG->blockmanagerclassfile)) {
 583                     require_once($CFG->blockmanagerclassfile);
 584                 }
 585                 $classname = $CFG->blockmanagerclass;
 586             } else {
 587                 $classname = 'block_manager';
 588             }
 589             $this->_blocks = new $classname($this);
 590         }
 591         return $this->_blocks;
 592     }
 593
 594     /**
 595      * Please do not call this method directly, use the ->requires syntax. {@link moodle_page::__get()}.
 596      * @return page_requirements_manager tracks the JavaScript, CSS files, etc. required by this page.
 597      */
 598     protected function magic_get_requires() {
 599         if (is_null($this->_requires)) {
 600             $this->_requires = new page_requirements_manager();
 601         }
 602         return $this->_requires;
 603     }
 604
 605     /**
 606      * Please do not call this method directly, use the ->cacheable syntax. {@link moodle_page::__get()}.
 607      * @return bool can this page be cached by the user's browser.
 608      */
 609     protected function magic_get_cacheable() {
 610         return $this->_cacheable;
 611     }
 612
 613     /**
 614      * Please do not call this method directly, use the ->focuscontrol syntax. {@link moodle_page::__get()}.
 615      * @return string the id of the HTML element to be focused when the page has loaded.
 616      */
 617     protected function magic_get_focuscontrol() {
 618         return $this->_focuscontrol;
 619     }
 620
 621     /**
 622      * Please do not call this method directly, use the ->button syntax. {@link moodle_page::__get()}.
 623      * @return string the HTML to go where the Turn editing on button normally goes.
 624      */
 625     protected function magic_get_button() {
 626         return $this->_button;
 627     }
 628
 629     /**
 630      * Please do not call this method directly, use the ->theme syntax. {@link moodle_page::__get()}.
 631      * @return theme_config the initialised theme for this page.
 632      */
 633     protected function magic_get_theme() {
 634         if (is_null($this->_theme)) {
 635             $this->initialise_theme_and_output();
 636         }
 637         return $this->_theme;
 638     }
 639
 640     /**
 641      * Returns an array of minipulations or false if there are none to make.
 642      *
 643      * @since 2.5.1 2.6
 644      * @return bool|array
 645      */
 646     protected function magic_get_blockmanipulations() {
 647         if (!right_to_left()) {
 648             return false;
 649         }
 650         if (is_null($this->_theme)) {
 651             $this->initialise_theme_and_output();
 652         }
 653         return $this->_theme->blockrtlmanipulations;
 654     }
 655
 656     /**
 657      * Please do not call this method directly, use the ->devicetypeinuse syntax. {@link moodle_page::__get()}.
 658      * @return string The device type being used.
 659      */
 660     protected function magic_get_devicetypeinuse() {
 661         if (empty($this->_devicetypeinuse)) {
 662             $this->_devicetypeinuse = core_useragent::get_user_device_type();
 663         }
 664         return $this->_devicetypeinuse;
 665     }
 666
 667     /**
 668      * Please do not call this method directly use the ->periodicrefreshdelay syntax
 669      * {@link moodle_page::__get()}
 670      * @return int The periodic refresh delay to use with meta refresh
 671      */
 672     protected function magic_get_periodicrefreshdelay() {
 673         return $this->_periodicrefreshdelay;
 674     }
 675
 676     /**
 677      * Please do not call this method directly use the ->opencontainers syntax. {@link moodle_page::__get()}
 678      * @return xhtml_container_stack tracks XHTML tags on this page that have been opened but not closed.
 679      *      mainly for internal use by the rendering code.
 680      */
 681     protected function magic_get_opencontainers() {
 682         if (is_null($this->_opencontainers)) {
 683             $this->_opencontainers = new xhtml_container_stack();
 684         }
 685         return $this->_opencontainers;
 686     }
 687
 688     /**
 689      * Return the navigation object
 690      * @return global_navigation
 691      */
 692     protected function magic_get_navigation() {
 693         if ($this->_navigation === null) {
 694             $this->_navigation = new global_navigation($this);
 695         }
 696         return $this->_navigation;
 697     }
 698
 699     /**
 700      * Return a navbar object
 701      * @return navbar
 702      */
 703     protected function magic_get_navbar() {
 704         if ($this->_navbar === null) {
 705             $this->_navbar = new navbar($this);
 706         }
 707         return $this->_navbar;
 708     }
 709
 710     /**
 711      * Returns the settings navigation object
 712      * @return settings_navigation
 713      */
 714     protected function magic_get_settingsnav() {
 715         if ($this->_settingsnav === null) {
 716             $this->_settingsnav = new settings_navigation($this);
 717             $this->_settingsnav->initialise();
 718         }
 719         return $this->_settingsnav;
 720     }
 721
 722     /**
 723      * PHP overloading magic to make the $PAGE->course syntax work by redirecting
 724      * it to the corresponding $PAGE->magic_get_course() method if there is one, and
 725      * throwing an exception if not.
 726      *
 727      * @param string $name property name
 728      * @return mixed
 729      * @throws coding_exception
 730      */
 731     public function __get($name) {
 732         $getmethod = 'magic_get_' . $name;
 733         if (method_exists($this, $getmethod)) {
 734             return $this->$getmethod();
 735         } else {
 736             throw new coding_exception('Unknown property ' . $name . ' of $PAGE.');
 737         }
 738     }
 739
 740     /**
 741      * PHP overloading magic to catch obvious coding errors.
 742      *
 743      * This method has been created to catch obvious coding errors where the
 744      * developer has tried to set a page property using $PAGE->key = $value.
 745      * In the moodle_page class all properties must be set using the appropriate
 746      * $PAGE->set_something($value) method.
 747      *
 748      * @param string $name property name
 749      * @param mixed $value Value
 750      * @return void Throws exception if field not defined in page class
 751      * @throws coding_exception
 752      */
 753     public function __set($name, $value) {
 754         if (method_exists($this, 'set_' . $name)) {
 755             throw new coding_exception('Invalid attempt to modify page object', "Use \$PAGE->set_$name() instead.");
 756         } else {
 757             throw new coding_exception('Invalid attempt to modify page object', "Unknown property $name");
 758         }
 759     }
 760
 761     // Other information getting methods ==========================================.
 762
 763     /**
 764      * Returns instance of page renderer
 765      *
 766      * @param string $component name such as 'core', 'mod_forum' or 'qtype_multichoice'.
 767      * @param string $subtype optional subtype such as 'news' resulting to 'mod_forum_news'
 768      * @param string $target one of rendering target constants
 769      * @return renderer_base
 770      */
 771     public function get_renderer($component, $subtype = null, $target = null) {
 772         $target = null;
 773         if ($this->pagelayout === 'maintenance') {
 774             // If the page is using the maintenance layout then we're going to force target to maintenance.
 775             // This leads to a special core renderer that is designed to block access to API's that are likely unavailable for this
 776             // page layout.
 777             $target = RENDERER_TARGET_MAINTENANCE;
 778         }
 779         return $this->magic_get_theme()->get_renderer($this, $component, $subtype, $target);
 780     }
 781
 782     /**
 783      * Checks to see if there are any items on the navbar object
 784      *
 785      * @return bool true if there are, false if not
 786      */
 787     public function has_navbar() {
 788         if ($this->_navbar === null) {
 789             $this->_navbar = new navbar($this);
 790         }
 791         return $this->_navbar->has_items();
 792     }
 793
 794     /**
 795      * Should the current user see this page in editing mode.
 796      * That is, are they allowed to edit this page, and are they currently in
 797      * editing mode.
 798      * @return bool
 799      */
 800     public function user_is_editing() {
 801         global $USER;
 802         return !empty($USER->editing) && $this->user_allowed_editing();
 803     }
 804
 805     /**
 806      * Does the user have permission to edit blocks on this page.
 807      * @return bool
 808      */
 809     public function user_can_edit_blocks() {
 810         return has_capability($this->_blockseditingcap, $this->_context);
 811     }
 812
 813     /**
 814      * Does the user have permission to see this page in editing mode.
 815      * @return bool
 816      */
 817     public function user_allowed_editing() {
 818         return has_any_capability($this->all_editing_caps(), $this->_context);
 819     }
 820
 821     /**
 822      * Get a description of this page. Normally displayed in the footer in developer debug mode.
 823      * @return string
 824      */
 825     public function debug_summary() {
 826         $summary = '';
 827         $summary .= 'General type: ' . $this->pagelayout . '. ';
 828         if (!during_initial_install()) {
 829             $summary .= 'Context ' . $this->context->get_context_name() . ' (context id ' . $this->_context->id . '). ';
 830         }
 831         $summary .= 'Page type ' . $this->pagetype .  '. ';
 832         if ($this->subpage) {
 833             $summary .= 'Sub-page ' . $this->subpage .  '. ';
 834         }
 835         return $summary;
 836     }
 837
 838     // Setter methods =============================================================.
 839
 840     /**
 841      * Set the state.
 842      *
 843      * The state must be one of that STATE_... constants, and the state is only allowed to advance one step at a time.
 844      *
 845      * @param int $state The new state.
 846      * @throws coding_exception
 847      */
 848     public function set_state($state) {
 849         if ($state != $this->_state + 1 || $state > self::STATE_DONE) {
 850             throw new coding_exception('Invalid state passed to moodle_page::set_state. We are in state ' .
 851                     $this->_state . ' and state ' . $state . ' was requested.');
 852         }
 853
 854         if ($state == self::STATE_PRINTING_HEADER) {
 855             $this->starting_output();
 856         }
 857
 858         $this->_state = $state;
 859     }
 860
 861     /**
 862      * Set the current course. This sets both $PAGE->course and $COURSE. It also
 863      * sets the right theme and locale.
 864      *
 865      * Normally you don't need to call this function yourself, require_login will
 866      * call it for you if you pass a $course to it. You can use this function
 867      * on pages that do need to call require_login().
 868      *
 869      * Sets $PAGE->context to the course context, if it is not already set.
 870      *
 871      * @param stdClass $course the course to set as the global course.
 872      * @throws coding_exception
 873      */
 874     public function set_course($course) {
 875         global $COURSE, $PAGE, $CFG, $SITE;
 876
 877         if (empty($course->id)) {
 878             throw new coding_exception('$course passed to moodle_page::set_course does not look like a proper course object.');
 879         }
 880
 881         $this->ensure_theme_not_set();
 882
 883         if (!empty($this->_course->id) && $this->_course->id != $course->id) {
 884             $this->_categories = null;
 885         }
 886
 887         $this->_course = clone($course);
 888
 889         if ($this === $PAGE) {
 890             $COURSE = $this->_course;
 891             moodle_setlocale();
 892         }
 893
 894         if (!$this->_context) {
 895             $this->set_context(context_course::instance($this->_course->id));
 896         }
 897
 898         // Notify course format that this page is set for the course.
 899         if ($this->_course->id != $SITE->id) {
 900             require_once($CFG->dirroot.'/course/lib.php');
 901             $courseformat = course_get_format($this->_course);
 902             $this->add_body_class('format-'. $courseformat->get_format());
 903             $courseformat->page_set_course($this);
 904         } else {
 905             $this->add_body_class('format-site');
 906         }
 907     }
 908
 909     /**
 910      * Set the main context to which this page belongs.
 911      *
 912      * @param context $context a context object. You normally get this with context_xxxx::instance().
 913      */
 914     public function set_context($context) {
 915         if ($context === null) {
 916             // Extremely ugly hack which sets context to some value in order to prevent warnings,
 917             // use only for core error handling!!!!
 918             if (!$this->_context) {
 919                 $this->_context = context_system::instance();
 920             }
 921             return;
 922         }
 923
 924         // Ideally we should set context only once.
 925         if (isset($this->_context) && $context->id !== $this->_context->id) {
 926             $current = $this->_context->contextlevel;
 927             if ($current == CONTEXT_SYSTEM or $current == CONTEXT_COURSE) {
 928                 // Hmm - not ideal, but it might produce too many warnings due to the design of require_login.
 929             } else if ($current == CONTEXT_MODULE and ($parentcontext = $context->get_parent_context()) and
 930                 $this->_context->id == $parentcontext->id) {
 931                 // Hmm - most probably somebody did require_login() and after that set the block context.
 932             } else {
 933                 // We do not want devs to do weird switching of context levels on the fly because we might have used
 934                 // the context already such as in text filter in page title.
 935                 debugging("Coding problem: unsupported modification of PAGE->context from {$current} to {$context->contextlevel}");
 936             }
 937         }
 938
 939         $this->_context = $context;
 940     }
 941
 942     /**
 943      * The course module that this page belongs to (if it does belong to one).
 944      *
 945      * @param stdClass|cm_info $cm a record from course_modules table or cm_info from get_fast_modinfo().
 946      * @param stdClass $course
 947      * @param stdClass $module
 948      * @return void
 949      * @throws coding_exception
 950      */
 951     public function set_cm($cm, $course = null, $module = null) {
 952         global $DB, $CFG, $SITE;
 953
 954         if (!isset($cm->id) || !isset($cm->course)) {
 955             throw new coding_exception('Invalid $cm. It has to be instance of cm_info or record from the course_modules table.');
 956         }
 957
 958         if (!$this->_course || $this->_course->id != $cm->course) {
 959             if (!$course) {
 960                 $course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
 961             }
 962             if ($course->id != $cm->course) {
 963                 throw new coding_exception('The course you passed to $PAGE->set_cm does not correspond to the $cm.');
 964             }
 965             $this->set_course($course);
 966         }
 967
 968         // Make sure we have a $cm from get_fast_modinfo as this contains activity access details.
 969         if (!($cm instanceof cm_info)) {
 970             $modinfo = get_fast_modinfo($this->_course);
 971             $cm = $modinfo->get_cm($cm->id);
 972         }
 973         $this->_cm = $cm;
 974
 975         // Unfortunately the context setting is a mess.
 976         // Let's try to work around some common block problems and show some debug messages.
 977         if (empty($this->_context) or $this->_context->contextlevel != CONTEXT_BLOCK) {
 978             $context = context_module::instance($cm->id);
 979             $this->set_context($context);
 980         }
 981
 982         if ($module) {
 983             $this->set_activity_record($module);
 984         }
 985
 986         // Notify course format that this page is set for the course module.
 987         if ($this->_course->id != $SITE->id) {
 988             require_once($CFG->dirroot.'/course/lib.php');
 989             course_get_format($this->_course)->page_set_cm($this);
 990         }
 991     }
 992
 993     /**
 994      * Sets the activity record. This could be a row from the main table for a
 995      * module. For instance if the current module (cm) is a forum this should be a row
 996      * from the forum table.
 997      *
 998      * @param stdClass $module A row from the main database table for the module that this page belongs to.
 999      * @throws coding_exception
1000      */
1001     public function set_activity_record($module) {
1002         if (is_null($this->_cm)) {
1003             throw new coding_exception('You cannot call $PAGE->set_activity_record until after $PAGE->cm has been set.');
1004         }
1005         if ($module->id != $this->_cm->instance || $module->course != $this->_course->id) {
1006             throw new coding_exception('The activity record does not seem to correspond to the cm that has been set.');
1007         }
1008         $this->_module = $module;
1009     }
1010
1011     /**
1012      * Sets the pagetype to use for this page.
1013      *
1014      * Normally you do not need to set this manually, it is automatically created
1015      * from the script name. However, on some pages this is overridden.
1016      * For example the page type for course/view.php includes the course format,
1017      * for example 'course-view-weeks'. This gets used as the id attribute on
1018      * <body> and also for determining which blocks are displayed.
1019      *
1020      * @param string $pagetype e.g. 'my-index' or 'mod-quiz-attempt'.
1021      */
1022     public function set_pagetype($pagetype) {
1023         $this->_pagetype = $pagetype;
1024     }
1025
1026     /**
1027      * Sets the layout to use for this page.
1028      *
1029      * The page layout determines how the page will be displayed, things such as
1030      * block regions, content areas, etc are controlled by the layout.
1031      * The theme in use for the page will determine that the layout contains.
1032      *
1033      * This properly defaults to 'base', so you only need to call this function if
1034      * you want something different. The exact range of supported layouts is specified
1035      * in the standard theme.
1036      *
1037      * For an idea of the common page layouts see
1038      * {@link http://docs.moodle.org/dev/Themes_2.0#The_different_layouts_as_of_August_17th.2C_2010}
1039      * But please keep in mind that it may be (and normally is) out of date.
1040      * The only place to find an accurate up-to-date list of the page layouts
1041      * available for your version of Moodle is {@link theme/base/config.php}
1042      *
1043      * @param string $pagelayout the page layout this is. For example 'popup', 'home'.
1044      */
1045     public function set_pagelayout($pagelayout) {
1046         // Uncomment this to debug theme pagelayout issues like missing blocks.
1047         // if (!empty($this->_wherethemewasinitialised) && $pagelayout != $this->_pagelayout)
1048         //     debugging('Page layout has already been set and cannot be changed.', DEBUG_DEVELOPER);
1049         $this->_pagelayout = $pagelayout;
1050     }
1051
1052     /**
1053      * If context->id and pagetype are not enough to uniquely identify this page,
1054      * then you can set a subpage id as well. For example, the tags page sets
1055      *
1056      * @param string $subpage an arbitrary identifier that, along with context->id
1057      *      and pagetype, uniquely identifies this page.
1058      */
1059     public function set_subpage($subpage) {
1060         if (empty($subpage)) {
1061             $this->_subpage = '';
1062         } else {
1063             $this->_subpage = $subpage;
1064         }
1065     }
1066
1067     /**
1068      * Adds a CSS class to the body tag of the page.
1069      *
1070      * @param string $class add this class name ot the class attribute on the body tag.
1071      * @throws coding_exception
1072      */
1073     public function add_body_class($class) {
1074         if ($this->_state > self::STATE_BEFORE_HEADER) {
1075             throw new coding_exception('Cannot call moodle_page::add_body_class after output has been started.');
1076         }
1077         $this->_bodyclasses[$class] = 1;
1078     }
1079
1080     /**
1081      * Adds an array of body classes to the body tag of this page.
1082      *
1083      * @param array $classes this utility method calls add_body_class for each array element.
1084      */
1085     public function add_body_classes($classes) {
1086         foreach ($classes as $class) {
1087             $this->add_body_class($class);
1088         }
1089     }
1090
1091     /**
1092      * Sets the title for the page.
1093      * This is normally used within the title tag in the head of the page.
1094      *
1095      * @param string $title the title that should go in the <head> section of the HTML of this page.
1096      */
1097     public function set_title($title) {
1098         $title = format_string($title);
1099         $title = strip_tags($title);
1100         $title = str_replace('"', '&quot;', $title);
1101         $this->_title = $title;
1102     }
1103
1104     /**
1105      * Sets the heading to use for the page.
1106      * This is normally used as the main heading at the top of the content.
1107      *
1108      * @param string $heading the main heading that should be displayed at the top of the <body>.
1109      */
1110     public function set_heading($heading) {
1111         $this->_heading = format_string($heading);
1112     }
1113
1114     /**
1115      * Sets some HTML to use next to the heading {@link moodle_page::set_heading()}
1116      *
1117      * @param string $menu The menu/content to show in the heading
1118      */
1119     public function set_headingmenu($menu) {
1120         $this->_headingmenu = $menu;
1121     }
1122
1123     /**
1124      * Set the course category this page belongs to manually.
1125      *
1126      * This automatically sets $PAGE->course to be the site course. You cannot
1127      * use this method if you have already set $PAGE->course - in that case,
1128      * the category must be the one that the course belongs to. This also
1129      * automatically sets the page context to the category context.
1130      *
1131      * @param int $categoryid The id of the category to set.
1132      * @throws coding_exception
1133      */
1134     public function set_category_by_id($categoryid) {
1135         global $SITE;
1136         if (!is_null($this->_course)) {
1137             throw new coding_exception('Course has already been set. You cannot change the category now.');
1138         }
1139         if (is_array($this->_categories)) {
1140             throw new coding_exception('Course category has already been set. You cannot to change it now.');
1141         }
1142         $this->ensure_theme_not_set();
1143         $this->set_course($SITE);
1144         $this->load_category($categoryid);
1145         $this->set_context(context_coursecat::instance($categoryid));
1146     }
1147
1148     /**
1149      * Set a different path to use for the 'Moodle docs for this page' link.
1150      *
1151      * By default, it uses the pagetype, which is normally the same as the
1152      * script name. So, for example, for mod/quiz/attempt.php, pagetype is
1153      * mod-quiz-attempt, and so docspath is mod/quiz/attempt.
1154      *
1155      * @param string $path the path to use at the end of the moodle docs URL.
1156      */
1157     public function set_docs_path($path) {
1158         $this->_docspath = $path;
1159     }
1160
1161     /**
1162      * You should call this method from every page to set the URL that should be used to return to this page.
1163      *
1164      * Used, for example, by the blocks editing UI to know where to return the
1165      * user after an action.
1166      * For example, course/view.php does:
1167      *      $id = optional_param('id', 0, PARAM_INT);
1168      *      $PAGE->set_url('/course/view.php', array('id' => $id));
1169      *
1170      * @param moodle_url|string $url URL relative to $CFG->wwwroot or {@link moodle_url} instance
1171      * @param array $params parameters to add to the URL
1172      * @throws coding_exception
1173      */
1174     public function set_url($url, array $params = null) {
1175         global $CFG;
1176
1177         if (is_string($url) && strpos($url, 'http') !== 0) {
1178             if (strpos($url, '/') === 0) {
1179                 // We have to use httpswwwroot here, because of loginhttps pages.
1180                 $url = $CFG->httpswwwroot . $url;
1181             } else {
1182                 throw new coding_exception('Invalid parameter $url, has to be full url or in shortened form starting with /.');
1183             }
1184         }
1185
1186         $this->_url = new moodle_url($url, $params);
1187
1188         $fullurl = $this->_url->out_omit_querystring();
1189         if (strpos($fullurl, "$CFG->httpswwwroot/") !== 0) {
1190             debugging('Most probably incorrect set_page() url argument, it does not match the httpswwwroot!');
1191         }
1192         $shorturl = str_replace("$CFG->httpswwwroot/", '', $fullurl);
1193
1194         if (is_null($this->_pagetype)) {
1195             $this->initialise_default_pagetype($shorturl);
1196         }
1197     }
1198
1199     /**
1200      * Make sure page URL does not contain the given URL parameter.
1201      *
1202      * This should not be necessary if the script has called set_url properly.
1203      * However, in some situations like the block editing actions; when the URL
1204      * has been guessed, it will contain dangerous block-related actions.
1205      * Therefore, the blocks code calls this function to clean up such parameters
1206      * before doing any redirect.
1207      *
1208      * @param string $param the name of the parameter to make sure is not in the
1209      * page URL.
1210      */
1211     public function ensure_param_not_in_url($param) {
1212         $this->_url->remove_params($param);
1213     }
1214
1215     /**
1216      * Sets an alternative version of this page.
1217      *
1218      * There can be alternate versions of some pages (for example an RSS feed version).
1219      * Call this method for each alternative version available.
1220      * For each alternative version a link will be included in the <head> tag.
1221      *
1222      * @param string $title The title to give the alternate version.
1223      * @param string|moodle_url $url The URL of the alternate version.
1224      * @param string $mimetype The mime-type of the alternate version.
1225      * @throws coding_exception
1226      */
1227     public function add_alternate_version($title, $url, $mimetype) {
1228         if ($this->_state > self::STATE_BEFORE_HEADER) {
1229             throw new coding_exception('Cannot call moodle_page::add_alternate_version after output has been started.');
1230         }
1231         $alt = new stdClass;
1232         $alt->title = $title;
1233         $alt->url = $url;
1234         $this->_alternateversions[$mimetype] = $alt;
1235     }
1236
1237     /**
1238      * Specify a form control should be focused when the page has loaded.
1239      *
1240      * @param string $controlid the id of the HTML element to be focused.
1241      */
1242     public function set_focuscontrol($controlid) {
1243         $this->_focuscontrol = $controlid;
1244     }
1245
1246     /**
1247      * Specify a fragment of HTML that goes where the 'Turn editing on' button normally goes.
1248      *
1249      * @param string $html the HTML to display there.
1250      */
1251     public function set_button($html) {
1252         $this->_button = $html;
1253     }
1254
1255     /**
1256      * Set the capability that allows users to edit blocks on this page.
1257      *
1258      * Normally the default of 'moodle/site:manageblocks' is used, but a few
1259      * pages like the My Moodle page need to use a different capability
1260      * like 'moodle/my:manageblocks'.
1261      *
1262      * @param string $capability a capability.
1263      */
1264     public function set_blocks_editing_capability($capability) {
1265         $this->_blockseditingcap = $capability;
1266     }
1267
1268     /**
1269      * Some pages let you turn editing on for reasons other than editing blocks.
1270      * If that is the case, you can pass other capabilities that let the user
1271      * edit this page here.
1272      *
1273      * @param string|array $capability either a capability, or an array of capabilities.
1274      */
1275     public function set_other_editing_capability($capability) {
1276         if (is_array($capability)) {
1277             $this->_othereditingcaps = array_unique($this->_othereditingcaps + $capability);
1278         } else {
1279             $this->_othereditingcaps[] = $capability;
1280         }
1281     }
1282
1283     /**
1284      * Sets whether the browser should cache this page or not.
1285      *
1286      * @param bool $cacheable can this page be cached by the user's browser.
1287      */
1288     public function set_cacheable($cacheable) {
1289         $this->_cacheable = $cacheable;
1290     }
1291
1292     /**
1293      * Sets the page to periodically refresh
1294      *
1295      * This function must be called before $OUTPUT->header has been called or
1296      * a coding exception will be thrown.
1297      *
1298      * @param int $delay Sets the delay before refreshing the page, if set to null refresh is cancelled.
1299      * @throws coding_exception
1300      */
1301     public function set_periodic_refresh_delay($delay = null) {
1302         if ($this->_state > self::STATE_BEFORE_HEADER) {
1303             throw new coding_exception('You cannot set a periodic refresh delay after the header has been printed');
1304         }
1305         if ($delay === null) {
1306             $this->_periodicrefreshdelay = null;
1307         } else if (is_int($delay)) {
1308             $this->_periodicrefreshdelay = $delay;
1309         }
1310     }
1311
1312     /**
1313      * Force this page to use a particular theme.
1314      *
1315      * Please use this cautiously.
1316      * It is only intended to be used by the themes selector admin page.
1317      *
1318      * @param string $themename the name of the theme to use.
1319      */
1320     public function force_theme($themename) {
1321         $this->ensure_theme_not_set();
1322         $this->_theme = theme_config::load($themename);
1323     }
1324
1325     /**
1326      * Reload theme settings.
1327      *
1328      * This is used when we need to reset settings
1329      * because they are now double cached in theme.
1330      */
1331     public function reload_theme() {
1332         if (!is_null($this->_theme)) {
1333             $this->_theme = theme_config::load($this->_theme->name);
1334         }
1335     }
1336
1337     /**
1338      * This function indicates that current page requires the https when $CFG->loginhttps enabled.
1339      *
1340      * By using this function properly, we can ensure 100% https-ized pages
1341      * at our entire discretion (login, forgot_password, change_password)
1342      *
1343      * @return void
1344      * @throws coding_exception
1345      */
1346     public function https_required() {
1347         global $CFG;
1348
1349         if (!is_null($this->_url)) {
1350             throw new coding_exception('https_required() must be used before setting page url!');
1351         }
1352
1353         $this->ensure_theme_not_set();
1354
1355         $this->_https_login_required = true;
1356
1357         if (!empty($CFG->loginhttps)) {
1358             $CFG->httpswwwroot = str_replace('http:', 'https:', $CFG->wwwroot);
1359         } else {
1360             $CFG->httpswwwroot = $CFG->wwwroot;
1361         }
1362     }
1363
1364     /**
1365      * Makes sure that page previously marked with https_required() is really using https://, if not it redirects to https://
1366      *
1367      * @return void (may redirect to https://self)
1368      * @throws coding_exception
1369      */
1370     public function verify_https_required() {
1371         global $CFG, $FULLME;
1372
1373         if (is_null($this->_url)) {
1374             throw new coding_exception('verify_https_required() must be called after setting page url!');
1375         }
1376
1377         if (!$this->_https_login_required) {
1378             throw new coding_exception('verify_https_required() must be called only after https_required()!');
1379         }
1380
1381         if (empty($CFG->loginhttps)) {
1382             // Https not required, so stop checking.
1383             return;
1384         }
1385
1386         if (strpos($this->_url, 'https://')) {
1387             // Detect if incorrect PAGE->set_url() used, it is recommended to use root-relative paths there.
1388             throw new coding_exception('Invalid page url. It must start with https:// for pages that set https_required()!');
1389         }
1390
1391         if (!empty($CFG->sslproxy)) {
1392             // It does not make much sense to use sslproxy and loginhttps at the same time.
1393             return;
1394         }
1395
1396         // Now the real test and redirect!
1397         // NOTE: do NOT use this test for detection of https on current page because this code is not compatible with SSL proxies,
1398         //       instead use (strpos($CFG->httpswwwroot, 'https:') === 0).
1399         if (strpos($FULLME, 'https:') !== 0) {
1400             // This may lead to infinite redirect on an incorrectly configured site.
1401             // In that case set $CFG->loginhttps=0; within /config.php.
1402             redirect($this->_url);
1403         }
1404     }
1405
1406     // Initialisation methods =====================================================
1407     // These set various things up in a default way.
1408
1409     /**
1410      * This method is called when the page first moves out of the STATE_BEFORE_HEADER
1411      * state. This is our last change to initialise things.
1412      */
1413     protected function starting_output() {
1414         global $CFG;
1415
1416         if (!during_initial_install()) {
1417             $this->blocks->load_blocks();
1418             if (empty($this->_block_actions_done)) {
1419                 $this->_block_actions_done = true;
1420                 if ($this->blocks->process_url_actions($this)) {
1421                     redirect($this->url->out(false));
1422                 }
1423             }
1424             $this->blocks->create_all_block_instances();
1425         }
1426
1427         // If maintenance mode is on, change the page header.
1428         if (!empty($CFG->maintenance_enabled)) {
1429             $this->set_button('<a href="' . $CFG->wwwroot . '/' . $CFG->admin .
1430                     '/settings.php?section=maintenancemode">' . get_string('maintenancemode', 'admin') .
1431                     '</a> ' . $this->button);
1432
1433             $title = $this->title;
1434             if ($title) {
1435                 $title .= ' - ';
1436             }
1437             $this->set_title($title . get_string('maintenancemode', 'admin'));
1438         } else {
1439             // Show the messaging popup if there are messages.
1440             message_popup_window();
1441         }
1442
1443         $this->initialise_standard_body_classes();
1444     }
1445
1446     /**
1447      * Method for use by Moodle core to set up the theme. Do not
1448      * use this in your own code.
1449      *
1450      * Make sure the right theme for this page is loaded. Tell our
1451      * blocks_manager about the theme block regions, and then, if
1452      * we are $PAGE, set up the global $OUTPUT.
1453      *
1454      * @return void
1455      */
1456     public function initialise_theme_and_output() {
1457         global $OUTPUT, $PAGE, $SITE, $CFG;
1458
1459         if (!empty($this->_wherethemewasinitialised)) {
1460             return;
1461         }
1462
1463         if (!during_initial_install()) {
1464             // Detect PAGE->context mess.
1465             $this->magic_get_context();
1466         }
1467
1468         if (!$this->_course && !during_initial_install()) {
1469             $this->set_course($SITE);
1470         }
1471
1472         if (is_null($this->_theme)) {
1473             $themename = $this->resolve_theme();
1474             $this->_theme = theme_config::load($themename);
1475         }
1476
1477         $this->_theme->setup_blocks($this->pagelayout, $this->blocks);
1478         if ($this->_theme->enable_dock && !empty($CFG->allowblockstodock)) {
1479             $this->requires->strings_for_js(array('addtodock', 'undockitem', 'dockblock', 'undockblock', 'undockall', 'hidedockpanel', 'hidepanel'), 'block');
1480             $this->requires->string_for_js('thisdirectionvertical', 'langconfig');
1481             $this->requires->yui_module('moodle-core-dock-loader', 'M.core.dock.loader.initLoader');
1482         }
1483
1484         if ($this === $PAGE) {
1485             $target = null;
1486             if ($this->pagelayout === 'maintenance') {
1487                 // If the page is using the maintenance layout then we're going to force target to maintenance.
1488                 // This leads to a special core renderer that is designed to block access to API's that are likely unavailable for this
1489                 // page layout.
1490                 $target = RENDERER_TARGET_MAINTENANCE;
1491             }
1492             $OUTPUT = $this->get_renderer('core', null, $target);
1493         }
1494
1495         $this->_wherethemewasinitialised = debug_backtrace();
1496     }
1497
1498     /**
1499      * Work out the theme this page should use.
1500      *
1501      * This depends on numerous $CFG settings, and the properties of this page.
1502      *
1503      * @return string the name of the theme that should be used on this page.
1504      */
1505     protected function resolve_theme() {
1506         global $CFG, $USER, $SESSION;
1507
1508         if (empty($CFG->themeorder)) {
1509             $themeorder = array('course', 'category', 'session', 'user', 'site');
1510         } else {
1511             $themeorder = $CFG->themeorder;
1512             // Just in case, make sure we always use the site theme if nothing else matched.
1513             $themeorder[] = 'site';
1514         }
1515
1516         $mnetpeertheme = '';
1517         if (isloggedin() and isset($CFG->mnet_localhost_id) and $USER->mnethostid != $CFG->mnet_localhost_id) {
1518             require_once($CFG->dirroot.'/mnet/peer.php');
1519             $mnetpeer = new mnet_peer();
1520             $mnetpeer->set_id($USER->mnethostid);
1521             if ($mnetpeer->force_theme == 1 && $mnetpeer->theme != '') {
1522                 $mnetpeertheme = $mnetpeer->theme;
1523             }
1524         }
1525
1526         foreach ($themeorder as $themetype) {
1527             switch ($themetype) {
1528                 case 'course':
1529                     if (!empty($CFG->allowcoursethemes) && !empty($this->_course->theme) && $this->devicetypeinuse == 'default') {
1530                         return $this->_course->theme;
1531                     }
1532                 break;
1533
1534                 case 'category':
1535                     if (!empty($CFG->allowcategorythemes) && $this->devicetypeinuse == 'default') {
1536                         $categories = $this->categories;
1537                         foreach ($categories as $category) {
1538                             if (!empty($category->theme)) {
1539                                 return $category->theme;
1540                             }
1541                         }
1542                     }
1543                 break;
1544
1545                 case 'session':
1546                     if (!empty($SESSION->theme)) {
1547                         return $SESSION->theme;
1548                     }
1549                 break;
1550
1551                 case 'user':
1552                     if (!empty($CFG->allowuserthemes) && !empty($USER->theme) && $this->devicetypeinuse == 'default') {
1553                         if ($mnetpeertheme) {
1554                             return $mnetpeertheme;
1555                         } else {
1556                             return $USER->theme;
1557                         }
1558                     }
1559                 break;
1560
1561                 case 'site':
1562                     if ($mnetpeertheme) {
1563                         return $mnetpeertheme;
1564                     }
1565                     // First try for the device the user is using.
1566                     $devicetheme = core_useragent::get_device_type_theme($this->devicetypeinuse);
1567                     if (!empty($devicetheme)) {
1568                         return $devicetheme;
1569                     }
1570                     // Next try for the default device (as a fallback).
1571                     $devicetheme = core_useragent::get_device_type_theme('default');
1572                     if (!empty($devicetheme)) {
1573                         return $devicetheme;
1574                     }
1575                     // The default device theme isn't set up - use the overall default theme.
1576                     return theme_config::DEFAULT_THEME;
1577             }
1578         }
1579
1580         // We should most certainly have resolved a theme by now. Something has gone wrong.
1581         debugging('Error resolving the theme to use for this page.', DEBUG_DEVELOPER);
1582         return theme_config::DEFAULT_THEME;
1583     }
1584
1585
1586     /**
1587      * Sets ->pagetype from the script name. For example, if the script that was
1588      * run is mod/quiz/view.php, ->pagetype will be set to 'mod-quiz-view'.
1589      *
1590      * @param string $script the path to the script that should be used to
1591      * initialise ->pagetype. If not passed the $SCRIPT global will be used.
1592      * If legacy code has set $CFG->pagepath that will be used instead, and a
1593      * developer warning issued.
1594      */
1595     protected function initialise_default_pagetype($script = null) {
1596         global $CFG, $SCRIPT;
1597
1598         if (isset($CFG->pagepath)) {
1599             debugging('Some code appears to have set $CFG->pagepath. That was a horrible deprecated thing. ' .
1600                     'Don\'t do it! Try calling $PAGE->set_pagetype() instead.');
1601             $script = $CFG->pagepath;
1602             unset($CFG->pagepath);
1603         }
1604
1605         if (is_null($script)) {
1606             $script = ltrim($SCRIPT, '/');
1607             $len = strlen($CFG->admin);
1608             if (substr($script, 0, $len) == $CFG->admin) {
1609                 $script = 'admin' . substr($script, $len);
1610             }
1611         }
1612
1613         $path = str_replace('.php', '', $script);
1614         if (substr($path, -1) == '/') {
1615             $path .= 'index';
1616         }
1617
1618         if (empty($path) || $path == 'index') {
1619             $this->_pagetype = 'site-index';
1620         } else {
1621             $this->_pagetype = str_replace('/', '-', $path);
1622         }
1623     }
1624
1625     /**
1626      * Initialises the CSS classes that will be added to body tag of the page.
1627      *
1628      * The function is responsible for adding all of the critical CSS classes
1629      * that describe the current page, and its state.
1630      * This includes classes that describe the following for example:
1631      *    - Current language
1632      *    - Language direction
1633      *    - YUI CSS initialisation
1634      *    - Pagelayout
1635      * These are commonly used in CSS to target specific types of pages.
1636      */
1637     protected function initialise_standard_body_classes() {
1638         global $CFG, $USER;
1639
1640         $pagetype = $this->pagetype;
1641         if ($pagetype == 'site-index') {
1642             $this->_legacyclass = 'course';
1643         } else if (substr($pagetype, 0, 6) == 'admin-') {
1644             $this->_legacyclass = 'admin';
1645         }
1646         $this->add_body_class($this->_legacyclass);
1647
1648         $pathbits = explode('-', trim($pagetype));
1649         for ($i = 1; $i < count($pathbits); $i++) {
1650             $this->add_body_class('path-' . join('-', array_slice($pathbits, 0, $i)));
1651         }
1652
1653         $this->add_body_classes(core_useragent::get_browser_version_classes());
1654         $this->add_body_class('dir-' . get_string('thisdirection', 'langconfig'));
1655         $this->add_body_class('lang-' . current_language());
1656         $this->add_body_class('yui-skin-sam'); // Make YUI happy, if it is used.
1657         $this->add_body_class('yui3-skin-sam'); // Make YUI3 happy, if it is used.
1658         $this->add_body_class($this->url_to_class_name($CFG->wwwroot));
1659
1660         // Extra class describing current page layout.
1661         $this->add_body_class('pagelayout-' . $this->_pagelayout);
1662
1663         if (!during_initial_install()) {
1664             $this->add_body_class('course-' . $this->_course->id);
1665             $this->add_body_class('context-' . $this->_context->id);
1666         }
1667
1668         if (!empty($this->_cm)) {
1669             $this->add_body_class('cmid-' . $this->_cm->id);
1670         }
1671
1672         if (!empty($CFG->allowcategorythemes)) {
1673             $this->ensure_category_loaded();
1674             foreach ($this->_categories as $catid => $notused) {
1675                 $this->add_body_class('category-' . $catid);
1676             }
1677         } else {
1678             $catid = 0;
1679             if (is_array($this->_categories)) {
1680                 $catids = array_keys($this->_categories);
1681                 $catid = reset($catids);
1682             } else if (!empty($this->_course->category)) {
1683                 $catid = $this->_course->category;
1684             }
1685             if ($catid) {
1686                 $this->add_body_class('category-' . $catid);
1687             }
1688         }
1689
1690         if (!isloggedin()) {
1691             $this->add_body_class('notloggedin');
1692         }
1693
1694         if (!empty($USER->editing)) {
1695             $this->add_body_class('editing');
1696             if (optional_param('bui_moveid', false, PARAM_INT)) {
1697                 $this->add_body_class('blocks-moving');
1698             }
1699         }
1700
1701         if (!empty($CFG->blocksdrag)) {
1702             $this->add_body_class('drag');
1703         }
1704
1705         if ($this->_devicetypeinuse != 'default') {
1706             $this->add_body_class($this->_devicetypeinuse . 'theme');
1707         }
1708     }
1709
1710     /**
1711      * Loads the activity record for the current CM object associated with this
1712      * page.
1713      *
1714      * This will load {@link moodle_page::$_module} with a row from the related
1715      * module table in the database.
1716      * For instance if {@link moodle_page::$_cm} is a forum then a row from the
1717      * forum table will be loaded.
1718      */
1719     protected function load_activity_record() {
1720         global $DB;
1721         if (is_null($this->_cm)) {
1722             return;
1723         }
1724         $this->_module = $DB->get_record($this->_cm->modname, array('id' => $this->_cm->instance));
1725     }
1726
1727     /**
1728      * This function ensures that the category of the current course has been
1729      * loaded, and if not, the function loads it now.
1730      *
1731      * @return void
1732      * @throws coding_exception
1733      */
1734     protected function ensure_category_loaded() {
1735         if (is_array($this->_categories)) {
1736             return; // Already done.
1737         }
1738         if (is_null($this->_course)) {
1739             throw new coding_exception('Attempt to get the course category for this page before the course was set.');
1740         }
1741         if ($this->_course->category == 0) {
1742             $this->_categories = array();
1743         } else {
1744             $this->load_category($this->_course->category);
1745         }
1746     }
1747
1748     /**
1749      * Loads the requested category into the pages categories array.
1750      *
1751      * @param int $categoryid
1752      * @throws moodle_exception
1753      */
1754     protected function load_category($categoryid) {
1755         global $DB;
1756         $category = $DB->get_record('course_categories', array('id' => $categoryid));
1757         if (!$category) {
1758             throw new moodle_exception('unknowncategory');
1759         }
1760         $this->_categories[$category->id] = $category;
1761         $parentcategoryids = explode('/', trim($category->path, '/'));
1762         array_pop($parentcategoryids);
1763         foreach (array_reverse($parentcategoryids) as $catid) {
1764             $this->_categories[$catid] = null;
1765         }
1766     }
1767
1768     /**
1769      * Ensures that the category the current course is within, as well as all of
1770      * its parent categories, have been loaded.
1771      *
1772      * @return void
1773      */
1774     protected function ensure_categories_loaded() {
1775         global $DB;
1776         $this->ensure_category_loaded();
1777         if (!is_null(end($this->_categories))) {
1778             return; // Already done.
1779         }
1780         $idstoload = array_keys($this->_categories);
1781         array_shift($idstoload);
1782         $categories = $DB->get_records_list('course_categories', 'id', $idstoload);
1783         foreach ($idstoload as $catid) {
1784             $this->_categories[$catid] = $categories[$catid];
1785         }
1786     }
1787
1788     /**
1789      * Ensure the theme has not been loaded yet. If it has an exception is thrown.
1790      * @source
1791      *
1792      * @throws coding_exception
1793      */
1794     protected function ensure_theme_not_set() {
1795         if (!is_null($this->_theme)) {
1796             throw new coding_exception('The theme has already been set up for this page ready for output. ' .
1797                     'Therefore, you can no longer change the theme, or anything that might affect what ' .
1798                     'the current theme is, for example, the course.',
1799                     'Stack trace when the theme was set up: ' . format_backtrace($this->_wherethemewasinitialised));
1800         }
1801     }
1802
1803     /**
1804      * Converts the provided URL into a CSS class that be used within the page.
1805      * This is primarily used to add the wwwroot to the body tag as a CSS class.
1806      *
1807      * @param string $url
1808      * @return string
1809      */
1810     protected function url_to_class_name($url) {
1811         $bits = parse_url($url);
1812         $class = str_replace('.', '-', $bits['host']);
1813         if (!empty($bits['port'])) {
1814             $class .= '--' . $bits['port'];
1815         }
1816         if (!empty($bits['path'])) {
1817             $path = trim($bits['path'], '/');
1818             if ($path) {
1819                 $class .= '--' . str_replace('/', '-', $path);
1820             }
1821         }
1822         return $class;
1823     }
1824
1825     /**
1826      * Combines all of the required editing caps for the page and returns them
1827      * as an array.
1828      *
1829      * @return array
1830      */
1831     protected function all_editing_caps() {
1832         $caps = $this->_othereditingcaps;
1833         $caps[] = $this->_blockseditingcap;
1834         return $caps;
1835     }
1836
1837     /**
1838      * Returns true if the page URL has beem set.
1839      *
1840      * @return bool
1841      */
1842     public function has_set_url() {
1843         return ($this->_url!==null);
1844     }
1845
1846     /**
1847      * Gets set when the block actions for the page have been processed.
1848      *
1849      * @param bool $setting
1850      */
1851     public function set_block_actions_done($setting = true) {
1852         $this->_block_actions_done = $setting;
1853     }
1854
1855     /**
1856      * Are popup notifications allowed on this page?
1857      * Popup notifications may be disallowed in situations such as while upgrading or completing a quiz
1858      *
1859      * @return bool true if popup notifications may be displayed
1860      */
1861     public function get_popup_notification_allowed() {
1862         return $this->_popup_notification_allowed;
1863     }
1864
1865     /**
1866      * Allow or disallow popup notifications on this page. Popups are allowed by default.
1867      *
1868      * @param bool $allowed true if notifications are allowed. False if not allowed. They are allowed by default.
1869      */
1870     public function set_popup_notification_allowed($allowed) {
1871         $this->_popup_notification_allowed = $allowed;
1872     }
1873
1874     /**
1875      * Returns the block region having made any required theme manipulations.
1876      *
1877      * @since 2.5.1 2.6
1878      * @param string $region
1879      * @return string
1880      */
1881     public function apply_theme_region_manipulations($region) {
1882         if ($this->blockmanipulations && isset($this->blockmanipulations[$region])) {
1883             $regionwas = $region;
1884             $regionnow = $this->blockmanipulations[$region];
1885             if ($this->blocks->is_known_region($regionwas) && $this->blocks->is_known_region($regionnow)) {
1886                 // Both the before and after regions are known so we can swap them over.
1887                 return $regionnow;
1888             }
1889             // We didn't know about both, we won't swap them over.
1890             return $regionwas;
1891         }
1892         return $region;
1893     }
1894 }