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MDL-23797 improved detection of PAGE->context abuse andproblems; fixed incorrect use of this->context instead of this->_context; missing PAGE->context does not throw fatal error any more
This commit is contained in:
Petr Skoda
parent
df92ba9a43
commit
eb5bdb3510
4 changed files with 65 additions and 26 deletions
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@ -328,12 +328,13 @@ class moodle_page {
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*/
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protected function magic_get_context() {
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if (is_null($this->_context)) {
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if (CLI_SCRIPT) {
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// cli scripts work in system context, do not annoy devs with fatal errors here
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$this->_context = get_context_instance(CONTEXT_SYSTEM);
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if (CLI_SCRIPT or NO_MOODLE_COOKIES) {
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// cli scripts work in system context, do not annoy devs with debug info
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// very few scripts do not use cookies, we can safely use system as default context there
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} else {
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throw new coding_exception('$PAGE->context accessed before it was known.');
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debugging('Coding problem: this page does not set $PAGE->context properly.');
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}
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$this->_context = get_context_instance(CONTEXT_SYSTEM);
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}
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return $this->_context;
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}
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@ -641,7 +642,7 @@ class moodle_page {
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if ($this->_legacypageobject) {
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return $this->_legacypageobject->user_allowed_editing();
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}
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return has_any_capability($this->all_editing_caps(), $this->context);
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return has_any_capability($this->all_editing_caps(), $this->_context);
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}
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/**
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@ -652,7 +653,7 @@ class moodle_page {
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$summary = '';
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$summary .= 'General type: ' . $this->pagelayout . '. ';
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if (!during_initial_install()) {
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$summary .= 'Context ' . print_context_name($this->context) . ' (context id ' . $this->context->id . '). ';
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$summary .= 'Context ' . print_context_name($this->_context) . ' (context id ' . $this->_context->id . '). ';
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}
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$summary .= 'Page type ' . $this->pagetype . '. ';
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if ($this->subpage) {
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@ -723,6 +724,28 @@ class moodle_page {
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* @param object $context a context object, normally obtained with get_context_instance.
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*/
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public function set_context($context) {
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if ($context === null) {
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// extremely ugly hack which sets context to some value in order to prevent warnings,
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// use only for core error handling!!!!
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if (!$this->_context) {
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$this->_context = get_context_instance(CONTEXT_SYSTEM);
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}
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return;
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}
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// ideally we should set context only once
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if (isset($this->_context)) {
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if ($context->id == $this->_context->id) {
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// fine - no change needed
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} else if ($this->_context->contextlevel == CONTEXT_SYSTEM or $this->_context->contextlevel == CONTEXT_COURSE) {
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// hmm - not ideal, but it might produce too many warnings due to the design of require_login
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} else {
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// we do not want devs to do weird switching of context levels on the fly,
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// because we might have used the context already such as in text filter in page title
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debugging('Coding problem: unsupported modification of PAGE->context from '.$this->_context->contextlevel.' to '.$context->contextlevel);
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}
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}
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$this->_context = $context;
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}
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@ -732,6 +755,8 @@ class moodle_page {
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* @param objcet $cm a full cm object obtained from get_coursemodule_from_id or get_coursemodule_from_instance.
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*/
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public function set_cm($cm, $course = null, $module = null) {
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global $DB;
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if (!isset($cm->name) || !isset($cm->modname) || !isset($cm->id)) {
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throw new coding_exception('The $cm you set on $PAGE must have been obtained with get_coursemodule_from_id or get_coursemodule_from_instance. That is, the ->name and -> modname fields must be present and correct.');
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}
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@ -742,8 +767,7 @@ class moodle_page {
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}
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if (!$this->_course || $this->_course->id != $cm->course) {
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if (!$course) {
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global $DB;
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$course = $DB->get_record('course', array('id' => $cm->course));
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$course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
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}
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if ($course->id != $cm->course) {
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throw new coding_exception('The course you passed to $PAGE->set_cm does not seem to correspond to the $cm.');
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@ -1115,6 +1139,11 @@ class moodle_page {
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return;
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}
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if (!during_initial_install()) {
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// detect PAGE->context mess
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$this->magic_get_context();
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}
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if (!$this->_course && !during_initial_install()) {
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$this->set_course($SITE);
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}
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@ -1290,7 +1319,7 @@ class moodle_page {
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if (!during_initial_install()) {
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$this->add_body_class('course-' . $this->_course->id);
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$this->add_body_class('context-' . $this->context->id);
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$this->add_body_class('context-' . $this->_context->id);
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}
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if (!empty($this->_cm)) {
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@ -1669,10 +1698,10 @@ function page_map_class($type, $classname = NULL) {
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* @deprecated since Moodle 2.0
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* Parent class from which all Moodle page classes derive
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*
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* @package moodlecore
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* @subpackage pages
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* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @package core
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* @subpackage lib
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* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class page_base extends moodle_page {
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/**
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@ -1707,10 +1736,10 @@ class page_base extends moodle_page {
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* Although this does nothing, this class declaration should be left for now
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* since there may be legacy class doing class page_... extends page_course
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*
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* @package moodlecore
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* @subpackage pages
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* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @package core
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* @subpackage lib
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* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class page_course extends page_base {
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}
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@ -1719,10 +1748,10 @@ class page_course extends page_base {
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* @deprecated since Moodle 2.0
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* Class that models the common parts of all activity modules
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*
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* @package moodlecore
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* @subpackage pages
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* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @package core
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* @subpackage lib
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* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class page_generic_activity extends page_base {
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// Although this function is deprecated, it should be left here because
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