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moodle/lib/filterlib.php
John Okely 672f483670 MDL-42834 admin: Removal of httpswwwroot
2017-10-23 12:25:36 +08:00

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Library functions for managing text filter plugins.
*
* @package core
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/** The states a filter can be in, stored in the filter_active table. */
define('TEXTFILTER_ON', 1);
/** The states a filter can be in, stored in the filter_active table. */
define('TEXTFILTER_INHERIT', 0);
/** The states a filter can be in, stored in the filter_active table. */
define('TEXTFILTER_OFF', -1);
/** The states a filter can be in, stored in the filter_active table. */
define('TEXTFILTER_DISABLED', -9999);
/**
* Define one exclusive separator that we'll use in the temp saved tags
* keys. It must be something rare enough to avoid having matches with
* filterobjects. MDL-18165
*/
define('TEXTFILTER_EXCL_SEPARATOR', '-%-');
/**
* Class to manage the filtering of strings. It is intended that this class is
* only used by weblib.php. Client code should probably be using the
* format_text and format_string functions.
*
* This class is a singleton.
*
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class filter_manager {
/**
* @var moodle_text_filter[][] This list of active filters, by context, for filtering content.
* An array contextid => ordered array of filter name => filter objects.
*/
protected $textfilters = array();
/**
* @var moodle_text_filter[][] This list of active filters, by context, for filtering strings.
* An array contextid => ordered array of filter name => filter objects.
*/
protected $stringfilters = array();
/** @var array Exploded version of $CFG->stringfilters. */
protected $stringfilternames = array();
/** @var filter_manager Holds the singleton instance. */
protected static $singletoninstance;
/**
* Constructor. Protected. Use {@link instance()} instead.
*/
protected function __construct() {
$this->stringfilternames = filter_get_string_filters();
}
/**
* Factory method. Use this to get the filter manager.
*
* @return filter_manager the singleton instance.
*/
public static function instance() {
global $CFG;
if (is_null(self::$singletoninstance)) {
if (!empty($CFG->perfdebug) and $CFG->perfdebug > 7) {
self::$singletoninstance = new performance_measuring_filter_manager();
} else {
self::$singletoninstance = new self();
}
}
return self::$singletoninstance;
}
/**
* Resets the caches, usually to be called between unit tests
*/
public static function reset_caches() {
if (self::$singletoninstance) {
self::$singletoninstance->unload_all_filters();
}
self::$singletoninstance = null;
}
/**
* Unloads all filters and other cached information
*/
protected function unload_all_filters() {
$this->textfilters = array();
$this->stringfilters = array();
$this->stringfilternames = array();
}
/**
* Load all the filters required by this context.
*
* @param context $context the context.
*/
protected function load_filters($context) {
$filters = filter_get_active_in_context($context);
$this->textfilters[$context->id] = array();
$this->stringfilters[$context->id] = array();
foreach ($filters as $filtername => $localconfig) {
$filter = $this->make_filter_object($filtername, $context, $localconfig);
if (is_null($filter)) {
continue;
}
$this->textfilters[$context->id][$filtername] = $filter;
if (in_array($filtername, $this->stringfilternames)) {
$this->stringfilters[$context->id][$filtername] = $filter;
}
}
}
/**
* Factory method for creating a filter.
*
* @param string $filtername The filter name, for example 'tex'.
* @param context $context context object.
* @param array $localconfig array of local configuration variables for this filter.
* @return moodle_text_filter The filter, or null, if this type of filter is
* not recognised or could not be created.
*/
protected function make_filter_object($filtername, $context, $localconfig) {
global $CFG;
$path = $CFG->dirroot .'/filter/'. $filtername .'/filter.php';
if (!is_readable($path)) {
return null;
}
include_once($path);
$filterclassname = 'filter_' . $filtername;
if (class_exists($filterclassname)) {
return new $filterclassname($context, $localconfig);
}
return null;
}
/**
* Apply a list of filters to some content.
* @param string $text
* @param moodle_text_filter[] $filterchain array filter name => filter object.
* @param array $options options passed to the filters.
* @param array $skipfilters of filter names. Any filters that should not be applied to this text.
* @return string $text
*/
protected function apply_filter_chain($text, $filterchain, array $options = array(),
array $skipfilters = null) {
foreach ($filterchain as $filtername => $filter) {
if ($skipfilters !== null && in_array($filtername, $skipfilters)) {
continue;
}
$text = $filter->filter($text, $options);
}
return $text;
}
/**
* Get all the filters that apply to a given context for calls to format_text.
*
* @param context $context
* @return moodle_text_filter[] A text filter
*/
protected function get_text_filters($context) {
if (!isset($this->textfilters[$context->id])) {
$this->load_filters($context);
}
return $this->textfilters[$context->id];
}
/**
* Get all the filters that apply to a given context for calls to format_string.
*
* @param context $context the context.
* @return moodle_text_filter[] A text filter
*/
protected function get_string_filters($context) {
if (!isset($this->stringfilters[$context->id])) {
$this->load_filters($context);
}
return $this->stringfilters[$context->id];
}
/**
* Filter some text
*
* @param string $text The text to filter
* @param context $context the context.
* @param array $options options passed to the filters
* @param array $skipfilters of filter names. Any filters that should not be applied to this text.
* @return string resulting text
*/
public function filter_text($text, $context, array $options = array(),
array $skipfilters = null) {
$text = $this->apply_filter_chain($text, $this->get_text_filters($context), $options, $skipfilters);
// <nolink> tags removed for XHTML compatibility
$text = str_replace(array('<nolink>', '</nolink>'), '', $text);
return $text;
}
/**
* Filter a piece of string
*
* @param string $string The text to filter
* @param context $context the context.
* @return string resulting string
*/
public function filter_string($string, $context) {
return $this->apply_filter_chain($string, $this->get_string_filters($context));
}
/**
* @deprecated Since Moodle 3.0 MDL-50491. This was used by the old text filtering system, but no more.
*/
public function text_filtering_hash() {
throw new coding_exception('filter_manager::text_filtering_hash() can not be used any more');
}
/**
* Setup page with filters requirements and other prepare stuff.
*
* This method is used by {@see format_text()} and {@see format_string()}
* in order to allow filters to setup any page requirement (js, css...)
* or perform any action needed to get them prepared before filtering itself
* happens by calling to each every active setup() method.
*
* Note it's executed for each piece of text filtered, so filter implementations
* are responsible of controlling the cardinality of the executions that may
* be different depending of the stuff to prepare.
*
* @param moodle_page $page the page we are going to add requirements to.
* @param context $context the context which contents are going to be filtered.
* @since Moodle 2.3
*/
public function setup_page_for_filters($page, $context) {
$filters = $this->get_text_filters($context);
foreach ($filters as $filter) {
$filter->setup($page, $context);
}
}
/**
* Setup the page for globally available filters.
*
* This helps setting up the page for filters which may be applied to
* the page, even if they do not belong to the current context, or are
* not yet visible because the content is lazily added (ajax). This method
* always uses to the system context which determines the globally
* available filters.
*
* This should only ever be called once per request.
*
* @param moodle_page $page The page.
* @since Moodle 3.2
*/
public function setup_page_for_globally_available_filters($page) {
$context = context_system::instance();
$filterdata = filter_get_globally_enabled_filters_with_config();
foreach ($filterdata as $name => $config) {
if (isset($this->textfilters[$context->id][$name])) {
$filter = $this->textfilters[$context->id][$name];
} else {
$filter = $this->make_filter_object($name, $context, $config);
if (is_null($filter)) {
continue;
}
}
$filter->setup($page, $context);
}
}
}
/**
* Filter manager subclass that does nothing. Having this simplifies the logic
* of format_text, etc.
*
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class null_filter_manager {
public function filter_text($text, $context, array $options = array(),
array $skipfilters = null) {
return $text;
}
public function filter_string($string, $context) {
return $string;
}
public function text_filtering_hash() {
throw new coding_exception('filter_manager::text_filtering_hash() can not be used any more');
}
}
/**
* Filter manager subclass that tracks how much work it does.
*
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class performance_measuring_filter_manager extends filter_manager {
/** @var int number of filter objects created. */
protected $filterscreated = 0;
/** @var int number of calls to filter_text. */
protected $textsfiltered = 0;
/** @var int number of calls to filter_string. */
protected $stringsfiltered = 0;
protected function unload_all_filters() {
parent::unload_all_filters();
$this->filterscreated = 0;
$this->textsfiltered = 0;
$this->stringsfiltered = 0;
}
protected function make_filter_object($filtername, $context, $localconfig) {
$this->filterscreated++;
return parent::make_filter_object($filtername, $context, $localconfig);
}
public function filter_text($text, $context, array $options = array(),
array $skipfilters = null) {
$this->textsfiltered++;
return parent::filter_text($text, $context, $options, $skipfilters);
}
public function filter_string($string, $context) {
$this->stringsfiltered++;
return parent::filter_string($string, $context);
}
/**
* Return performance information, in the form required by {@link get_performance_info()}.
* @return array the performance info.
*/
public function get_performance_summary() {
return array(array(
'contextswithfilters' => count($this->textfilters),
'filterscreated' => $this->filterscreated,
'textsfiltered' => $this->textsfiltered,
'stringsfiltered' => $this->stringsfiltered,
), array(
'contextswithfilters' => 'Contexts for which filters were loaded',
'filterscreated' => 'Filters created',
'textsfiltered' => 'Pieces of content filtered',
'stringsfiltered' => 'Strings filtered',
));
}
}
/**
* Base class for text filters. You just need to override this class and
* implement the filter method.
*
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class moodle_text_filter {
/** @var context The context we are in. */
protected $context;
/** @var array Any local configuration for this filter in this context. */
protected $localconfig;
/**
* Set any context-specific configuration for this filter.
*
* @param context $context The current context.
* @param array $localconfig Any context-specific configuration for this filter.
*/
public function __construct($context, array $localconfig) {
$this->context = $context;
$this->localconfig = $localconfig;
}
/**
* @deprecated Since Moodle 3.0 MDL-50491. This was used by the old text filtering system, but no more.
*/
public function hash() {
throw new coding_exception('moodle_text_filter::hash() can not be used any more');
}
/**
* Setup page with filter requirements and other prepare stuff.
*
* Override this method if the filter needs to setup page
* requirements or needs other stuff to be executed.
*
* Note this method is invoked from {@see setup_page_for_filters()}
* for each piece of text being filtered, so it is responsible
* for controlling its own execution cardinality.
*
* @param moodle_page $page the page we are going to add requirements to.
* @param context $context the context which contents are going to be filtered.
* @since Moodle 2.3
*/
public function setup($page, $context) {
// Override me, if needed.
}
/**
* Override this function to actually implement the filtering.
*
* @param $text some HTML content.
* @param array $options options passed to the filters
* @return the HTML content after the filtering has been applied.
*/
public abstract function filter($text, array $options = array());
}
/**
* This is just a little object to define a phrase and some instructions
* for how to process it. Filters can create an array of these to pass
* to the filter_phrases function below.
*
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
**/
class filterobject {
/** @var string */
var $phrase;
var $hreftagbegin;
var $hreftagend;
/** @var bool */
var $casesensitive;
var $fullmatch;
/** @var mixed */
var $replacementphrase;
var $work_phrase;
var $work_hreftagbegin;
var $work_hreftagend;
var $work_casesensitive;
var $work_fullmatch;
var $work_replacementphrase;
/** @var bool */
var $work_calculated;
/**
* A constructor just because I like constructing
*
* @param string $phrase
* @param string $hreftagbegin
* @param string $hreftagend
* @param bool $casesensitive
* @param bool $fullmatch
* @param mixed $replacementphrase
*/
public function __construct($phrase, $hreftagbegin = '<span class="highlight">',
$hreftagend = '</span>',
$casesensitive = false,
$fullmatch = false,
$replacementphrase = NULL) {
$this->phrase = $phrase;
$this->hreftagbegin = $hreftagbegin;
$this->hreftagend = $hreftagend;
$this->casesensitive = $casesensitive;
$this->fullmatch = $fullmatch;
$this->replacementphrase= $replacementphrase;
$this->work_calculated = false;
}
}
/**
* Look up the name of this filter
*
* @param string $filter the filter name
* @return string the human-readable name for this filter.
*/
function filter_get_name($filter) {
if (strpos($filter, 'filter/') === 0) {
debugging("Old '$filter'' parameter used in filter_get_name()");
$filter = substr($filter, 7);
} else if (strpos($filter, '/') !== false) {
throw new coding_exception('Unknown filter type ' . $filter);
}
if (get_string_manager()->string_exists('filtername', 'filter_' . $filter)) {
return get_string('filtername', 'filter_' . $filter);
} else {
return $filter;
}
}
/**
* Get the names of all the filters installed in this Moodle.
*
* @return array path => filter name from the appropriate lang file. e.g.
* array('tex' => 'TeX Notation');
* sorted in alphabetical order of name.
*/
function filter_get_all_installed() {
global $CFG;
$filternames = array();
foreach (core_component::get_plugin_list('filter') as $filter => $fulldir) {
if (is_readable("$fulldir/filter.php")) {
$filternames[$filter] = filter_get_name($filter);
}
}
core_collator::asort($filternames);
return $filternames;
}
/**
* Set the global activated state for a text filter.
*
* @param string $filtername The filter name, for example 'tex'.
* @param int $state One of the values TEXTFILTER_ON, TEXTFILTER_OFF or TEXTFILTER_DISABLED.
* @param int $move -1 means up, 0 means the same, 1 means down
*/
function filter_set_global_state($filtername, $state, $move = 0) {
global $DB;
// Check requested state is valid.
if (!in_array($state, array(TEXTFILTER_ON, TEXTFILTER_OFF, TEXTFILTER_DISABLED))) {
throw new coding_exception("Illegal option '$state' passed to filter_set_global_state. " .
"Must be one of TEXTFILTER_ON, TEXTFILTER_OFF or TEXTFILTER_DISABLED.");
}
if ($move > 0) {
$move = 1;
} else if ($move < 0) {
$move = -1;
}
if (strpos($filtername, 'filter/') === 0) {
//debugging("Old filtername '$filtername' parameter used in filter_set_global_state()", DEBUG_DEVELOPER);
$filtername = substr($filtername, 7);
} else if (strpos($filtername, '/') !== false) {
throw new coding_exception("Invalid filter name '$filtername' used in filter_set_global_state()");
}
$transaction = $DB->start_delegated_transaction();
$syscontext = context_system::instance();
$filters = $DB->get_records('filter_active', array('contextid' => $syscontext->id), 'sortorder ASC');
$on = array();
$off = array();
foreach($filters as $f) {
if ($f->active == TEXTFILTER_DISABLED) {
$off[$f->filter] = $f;
} else {
$on[$f->filter] = $f;
}
}
// Update the state or add new record.
if (isset($on[$filtername])) {
$filter = $on[$filtername];
if ($filter->active != $state) {
add_to_config_log('filter_active', $filter->active, $state, $filtername);
$filter->active = $state;
$DB->update_record('filter_active', $filter);
if ($filter->active == TEXTFILTER_DISABLED) {
unset($on[$filtername]);
$off = array($filter->filter => $filter) + $off;
}
}
} else if (isset($off[$filtername])) {
$filter = $off[$filtername];
if ($filter->active != $state) {
add_to_config_log('filter_active', $filter->active, $state, $filtername);
$filter->active = $state;
$DB->update_record('filter_active', $filter);
if ($filter->active != TEXTFILTER_DISABLED) {
unset($off[$filtername]);
$on[$filter->filter] = $filter;
}
}
} else {
add_to_config_log('filter_active', '', $state, $filtername);
$filter = new stdClass();
$filter->filter = $filtername;
$filter->contextid = $syscontext->id;
$filter->active = $state;
$filter->sortorder = 99999;
$filter->id = $DB->insert_record('filter_active', $filter);
$filters[$filter->id] = $filter;
if ($state == TEXTFILTER_DISABLED) {
$off[$filter->filter] = $filter;
} else {
$on[$filter->filter] = $filter;
}
}
// Move only active.
if ($move != 0 and isset($on[$filter->filter])) {
$i = 1;
foreach ($on as $f) {
$f->newsortorder = $i;
$i++;
}
$filter->newsortorder = $filter->newsortorder + $move;
foreach ($on as $f) {
if ($f->id == $filter->id) {
continue;
}
if ($f->newsortorder == $filter->newsortorder) {
if ($move == 1) {
$f->newsortorder = $f->newsortorder - 1;
} else {
$f->newsortorder = $f->newsortorder + 1;
}
}
}
core_collator::asort_objects_by_property($on, 'newsortorder', core_collator::SORT_NUMERIC);
}
// Inactive are sorted by filter name.
core_collator::asort_objects_by_property($off, 'filter', core_collator::SORT_NATURAL);
// Update records if necessary.
$i = 1;
foreach ($on as $f) {
if ($f->sortorder != $i) {
$DB->set_field('filter_active', 'sortorder', $i, array('id'=>$f->id));
}
$i++;
}
foreach ($off as $f) {
if ($f->sortorder != $i) {
$DB->set_field('filter_active', 'sortorder', $i, array('id'=>$f->id));
}
$i++;
}
$transaction->allow_commit();
}
/**
* @param string $filtername The filter name, for example 'tex'.
* @return boolean is this filter allowed to be used on this site. That is, the
* admin has set the global 'active' setting to On, or Off, but available.
*/
function filter_is_enabled($filtername) {
if (strpos($filtername, 'filter/') === 0) {
//debugging("Old filtername '$filtername' parameter used in filter_is_enabled()", DEBUG_DEVELOPER);
$filtername = substr($filtername, 7);
} else if (strpos($filtername, '/') !== false) {
throw new coding_exception("Invalid filter name '$filtername' used in filter_is_enabled()");
}
return array_key_exists($filtername, filter_get_globally_enabled());
}
/**
* Return a list of all the filters that may be in use somewhere.
*
* @staticvar array $enabledfilters
* @return array where the keys and values are both the filter name, like 'tex'.
*/
function filter_get_globally_enabled() {
static $enabledfilters = null;
if (is_null($enabledfilters)) {
$filters = filter_get_global_states();
$enabledfilters = array();
foreach ($filters as $filter => $filerinfo) {
if ($filerinfo->active != TEXTFILTER_DISABLED) {
$enabledfilters[$filter] = $filter;
}
}
}
return $enabledfilters;
}
/**
* Get the globally enabled filters.
*
* This returns the filters which could be used in any context. Essentially
* the filters which are not disabled for the entire site.
*
* @return array Keys are filter names, and values the config.
*/
function filter_get_globally_enabled_filters_with_config() {
global $DB;
$sql = "SELECT f.filter, fc.name, fc.value
FROM {filter_active} f
LEFT JOIN {filter_config} fc
ON fc.filter = f.filter
AND fc.contextid = f.contextid
WHERE f.contextid = :contextid
AND f.active != :disabled
ORDER BY f.sortorder";
$rs = $DB->get_recordset_sql($sql, [
'contextid' => context_system::instance()->id,
'disabled' => TEXTFILTER_DISABLED
]);
// Massage the data into the specified format to return.
$filters = array();
foreach ($rs as $row) {
if (!isset($filters[$row->filter])) {
$filters[$row->filter] = array();
}
if ($row->name !== null) {
$filters[$row->filter][$row->name] = $row->value;
}
}
$rs->close();
return $filters;
}
/**
* Return the names of the filters that should also be applied to strings
* (when they are enabled).
*
* @return array where the keys and values are both the filter name, like 'tex'.
*/
function filter_get_string_filters() {
global $CFG;
$stringfilters = array();
if (!empty($CFG->filterall) && !empty($CFG->stringfilters)) {
$stringfilters = explode(',', $CFG->stringfilters);
$stringfilters = array_combine($stringfilters, $stringfilters);
}
return $stringfilters;
}
/**
* Sets whether a particular active filter should be applied to all strings by
* format_string, or just used by format_text.
*
* @param string $filter The filter name, for example 'tex'.
* @param boolean $applytostrings if true, this filter will apply to format_string
* and format_text, when it is enabled.
*/
function filter_set_applies_to_strings($filter, $applytostrings) {
$stringfilters = filter_get_string_filters();
$prevfilters = $stringfilters;
$allfilters = core_component::get_plugin_list('filter');
if ($applytostrings) {
$stringfilters[$filter] = $filter;
} else {
unset($stringfilters[$filter]);
}
// Remove missing filters.
foreach ($stringfilters as $filter) {
if (!isset($allfilters[$filter])) {
unset($stringfilters[$filter]);
}
}
if ($prevfilters != $stringfilters) {
set_config('stringfilters', implode(',', $stringfilters));
set_config('filterall', !empty($stringfilters));
}
}
/**
* Set the local activated state for a text filter.
*
* @param string $filter The filter name, for example 'tex'.
* @param integer $contextid The id of the context to get the local config for.
* @param integer $state One of the values TEXTFILTER_ON, TEXTFILTER_OFF or TEXTFILTER_INHERIT.
* @return void
*/
function filter_set_local_state($filter, $contextid, $state) {
global $DB;
// Check requested state is valid.
if (!in_array($state, array(TEXTFILTER_ON, TEXTFILTER_OFF, TEXTFILTER_INHERIT))) {
throw new coding_exception("Illegal option '$state' passed to filter_set_local_state. " .
"Must be one of TEXTFILTER_ON, TEXTFILTER_OFF or TEXTFILTER_INHERIT.");
}
if ($contextid == context_system::instance()->id) {
throw new coding_exception('You cannot use filter_set_local_state ' .
'with $contextid equal to the system context id.');
}
if ($state == TEXTFILTER_INHERIT) {
$DB->delete_records('filter_active', array('filter' => $filter, 'contextid' => $contextid));
return;
}
$rec = $DB->get_record('filter_active', array('filter' => $filter, 'contextid' => $contextid));
$insert = false;
if (empty($rec)) {
$insert = true;
$rec = new stdClass;
$rec->filter = $filter;
$rec->contextid = $contextid;
}
$rec->active = $state;
if ($insert) {
$DB->insert_record('filter_active', $rec);
} else {
$DB->update_record('filter_active', $rec);
}
}
/**
* Set a particular local config variable for a filter in a context.
*
* @param string $filter The filter name, for example 'tex'.
* @param integer $contextid The id of the context to get the local config for.
* @param string $name the setting name.
* @param string $value the corresponding value.
*/
function filter_set_local_config($filter, $contextid, $name, $value) {
global $DB;
$rec = $DB->get_record('filter_config', array('filter' => $filter, 'contextid' => $contextid, 'name' => $name));
$insert = false;
if (empty($rec)) {
$insert = true;
$rec = new stdClass;
$rec->filter = $filter;
$rec->contextid = $contextid;
$rec->name = $name;
}
$rec->value = $value;
if ($insert) {
$DB->insert_record('filter_config', $rec);
} else {
$DB->update_record('filter_config', $rec);
}
}
/**
* Remove a particular local config variable for a filter in a context.
*
* @param string $filter The filter name, for example 'tex'.
* @param integer $contextid The id of the context to get the local config for.
* @param string $name the setting name.
*/
function filter_unset_local_config($filter, $contextid, $name) {
global $DB;
$DB->delete_records('filter_config', array('filter' => $filter, 'contextid' => $contextid, 'name' => $name));
}
/**
* Get local config variables for a filter in a context. Normally (when your
* filter is running) you don't need to call this, becuase the config is fetched
* for you automatically. You only need this, for example, when you are getting
* the config so you can show the user an editing from.
*
* @param string $filter The filter name, for example 'tex'.
* @param integer $contextid The ID of the context to get the local config for.
* @return array of name => value pairs.
*/
function filter_get_local_config($filter, $contextid) {
global $DB;
return $DB->get_records_menu('filter_config', array('filter' => $filter, 'contextid' => $contextid), '', 'name,value');
}
/**
* This function is for use by backup. Gets all the filter information specific
* to one context.
*
* @param int $contextid
* @return array Array with two elements. The first element is an array of objects with
* fields filter and active. These come from the filter_active table. The
* second element is an array of objects with fields filter, name and value
* from the filter_config table.
*/
function filter_get_all_local_settings($contextid) {
global $DB;
return array(
$DB->get_records('filter_active', array('contextid' => $contextid), 'filter', 'filter,active'),
$DB->get_records('filter_config', array('contextid' => $contextid), 'filter,name', 'filter,name,value'),
);
}
/**
* Get the list of active filters, in the order that they should be used
* for a particular context, along with any local configuration variables.
*
* @param context $context a context
* @return array an array where the keys are the filter names, for example
* 'tex' and the values are any local
* configuration for that filter, as an array of name => value pairs
* from the filter_config table. In a lot of cases, this will be an
* empty array. So, an example return value for this function might be
* array(tex' => array())
*/
function filter_get_active_in_context($context) {
global $DB, $FILTERLIB_PRIVATE;
if (!isset($FILTERLIB_PRIVATE)) {
$FILTERLIB_PRIVATE = new stdClass();
}
// Use cache (this is a within-request cache only) if available. See
// function filter_preload_activities.
if (isset($FILTERLIB_PRIVATE->active) &&
array_key_exists($context->id, $FILTERLIB_PRIVATE->active)) {
return $FILTERLIB_PRIVATE->active[$context->id];
}
$contextids = str_replace('/', ',', trim($context->path, '/'));
// The following SQL is tricky. It is explained on
// http://docs.moodle.org/dev/Filter_enable/disable_by_context
$sql = "SELECT active.filter, fc.name, fc.value
FROM (SELECT f.filter, MAX(f.sortorder) AS sortorder
FROM {filter_active} f
JOIN {context} ctx ON f.contextid = ctx.id
WHERE ctx.id IN ($contextids)
GROUP BY filter
HAVING MAX(f.active * ctx.depth) > -MIN(f.active * ctx.depth)
) active
LEFT JOIN {filter_config} fc ON fc.filter = active.filter AND fc.contextid = $context->id
ORDER BY active.sortorder";
$rs = $DB->get_recordset_sql($sql);
// Massage the data into the specified format to return.
$filters = array();
foreach ($rs as $row) {
if (!isset($filters[$row->filter])) {
$filters[$row->filter] = array();
}
if (!is_null($row->name)) {
$filters[$row->filter][$row->name] = $row->value;
}
}
$rs->close();
return $filters;
}
/**
* Preloads the list of active filters for all activities (modules) on the course
* using two database queries.
*
* @param course_modinfo $modinfo Course object from get_fast_modinfo
*/
function filter_preload_activities(course_modinfo $modinfo) {
global $DB, $FILTERLIB_PRIVATE;
if (!isset($FILTERLIB_PRIVATE)) {
$FILTERLIB_PRIVATE = new stdClass();
}
// Don't repeat preload
if (!isset($FILTERLIB_PRIVATE->preloaded)) {
$FILTERLIB_PRIVATE->preloaded = array();
}
if (!empty($FILTERLIB_PRIVATE->preloaded[$modinfo->get_course_id()])) {
return;
}
$FILTERLIB_PRIVATE->preloaded[$modinfo->get_course_id()] = true;
// Get contexts for all CMs
$cmcontexts = array();
$cmcontextids = array();
foreach ($modinfo->get_cms() as $cm) {
$modulecontext = context_module::instance($cm->id);
$cmcontextids[] = $modulecontext->id;
$cmcontexts[] = $modulecontext;
}
// Get course context and all other parents...
$coursecontext = context_course::instance($modinfo->get_course_id());
$parentcontextids = explode('/', substr($coursecontext->path, 1));
$allcontextids = array_merge($cmcontextids, $parentcontextids);
// Get all filter_active rows relating to all these contexts
list ($sql, $params) = $DB->get_in_or_equal($allcontextids);
$filteractives = $DB->get_records_select('filter_active', "contextid $sql", $params, 'sortorder');
// Get all filter_config only for the cm contexts
list ($sql, $params) = $DB->get_in_or_equal($cmcontextids);
$filterconfigs = $DB->get_records_select('filter_config', "contextid $sql", $params);
// Note: I was a bit surprised that filter_config only works for the
// most specific context (i.e. it does not need to be checked for course
// context if we only care about CMs) however basede on code in
// filter_get_active_in_context, this does seem to be correct.
// Build course default active list. Initially this will be an array of
// filter name => active score (where an active score >0 means it's active)
$courseactive = array();
// Also build list of filter_active rows below course level, by contextid
$remainingactives = array();
// Array lists filters that are banned at top level
$banned = array();
// Add any active filters in parent contexts to the array
foreach ($filteractives as $row) {
$depth = array_search($row->contextid, $parentcontextids);
if ($depth !== false) {
// Find entry
if (!array_key_exists($row->filter, $courseactive)) {
$courseactive[$row->filter] = 0;
}
// This maths copes with reading rows in any order. Turning on/off
// at site level counts 1, at next level down 4, at next level 9,
// then 16, etc. This means the deepest level always wins, except
// against the -9999 at top level.
$courseactive[$row->filter] +=
($depth + 1) * ($depth + 1) * $row->active;
if ($row->active == TEXTFILTER_DISABLED) {
$banned[$row->filter] = true;
}
} else {
// Build list of other rows indexed by contextid
if (!array_key_exists($row->contextid, $remainingactives)) {
$remainingactives[$row->contextid] = array();
}
$remainingactives[$row->contextid][] = $row;
}
}
// Chuck away the ones that aren't active.
foreach ($courseactive as $filter=>$score) {
if ($score <= 0) {
unset($courseactive[$filter]);
} else {
$courseactive[$filter] = array();
}
}
// Loop through the contexts to reconstruct filter_active lists for each
// cm on the course.
if (!isset($FILTERLIB_PRIVATE->active)) {
$FILTERLIB_PRIVATE->active = array();
}
foreach ($cmcontextids as $contextid) {
// Copy course list
$FILTERLIB_PRIVATE->active[$contextid] = $courseactive;
// Are there any changes to the active list?
if (array_key_exists($contextid, $remainingactives)) {
foreach ($remainingactives[$contextid] as $row) {
if ($row->active > 0 && empty($banned[$row->filter])) {
// If it's marked active for specific context, add entry
// (doesn't matter if one exists already).
$FILTERLIB_PRIVATE->active[$contextid][$row->filter] = array();
} else {
// If it's marked inactive, remove entry (doesn't matter
// if it doesn't exist).
unset($FILTERLIB_PRIVATE->active[$contextid][$row->filter]);
}
}
}
}
// Process all config rows to add config data to these entries.
foreach ($filterconfigs as $row) {
if (isset($FILTERLIB_PRIVATE->active[$row->contextid][$row->filter])) {
$FILTERLIB_PRIVATE->active[$row->contextid][$row->filter][$row->name] = $row->value;
}
}
}
/**
* List all of the filters that are available in this context, and what the
* local and inherited states of that filter are.
*
* @param context $context a context that is not the system context.
* @return array an array with filter names, for example 'tex'
* as keys. and and the values are objects with fields:
* ->filter filter name, same as the key.
* ->localstate TEXTFILTER_ON/OFF/INHERIT
* ->inheritedstate TEXTFILTER_ON/OFF - the state that will be used if localstate is set to TEXTFILTER_INHERIT.
*/
function filter_get_available_in_context($context) {
global $DB;
// The complex logic is working out the active state in the parent context,
// so strip the current context from the list.
$contextids = explode('/', trim($context->path, '/'));
array_pop($contextids);
$contextids = implode(',', $contextids);
if (empty($contextids)) {
throw new coding_exception('filter_get_available_in_context cannot be called with the system context.');
}
// The following SQL is tricky, in the same way at the SQL in filter_get_active_in_context.
$sql = "SELECT parent_states.filter,
CASE WHEN fa.active IS NULL THEN " . TEXTFILTER_INHERIT . "
ELSE fa.active END AS localstate,
parent_states.inheritedstate
FROM (SELECT f.filter, MAX(f.sortorder) AS sortorder,
CASE WHEN MAX(f.active * ctx.depth) > -MIN(f.active * ctx.depth) THEN " . TEXTFILTER_ON . "
ELSE " . TEXTFILTER_OFF . " END AS inheritedstate
FROM {filter_active} f
JOIN {context} ctx ON f.contextid = ctx.id
WHERE ctx.id IN ($contextids)
GROUP BY f.filter
HAVING MIN(f.active) > " . TEXTFILTER_DISABLED . "
) parent_states
LEFT JOIN {filter_active} fa ON fa.filter = parent_states.filter AND fa.contextid = $context->id
ORDER BY parent_states.sortorder";
return $DB->get_records_sql($sql);
}
/**
* This function is for use by the filter administration page.
*
* @return array 'filtername' => object with fields 'filter' (=filtername), 'active' and 'sortorder'
*/
function filter_get_global_states() {
global $DB;
$context = context_system::instance();
return $DB->get_records('filter_active', array('contextid' => $context->id), 'sortorder', 'filter,active,sortorder');
}
/**
* Delete all the data in the database relating to a filter, prior to deleting it.
*
* @param string $filter The filter name, for example 'tex'.
*/
function filter_delete_all_for_filter($filter) {
global $DB;
unset_all_config_for_plugin('filter_' . $filter);
$DB->delete_records('filter_active', array('filter' => $filter));
$DB->delete_records('filter_config', array('filter' => $filter));
}
/**
* Delete all the data in the database relating to a context, used when contexts are deleted.
*
* @param integer $contextid The id of the context being deleted.
*/
function filter_delete_all_for_context($contextid) {
global $DB;
$DB->delete_records('filter_active', array('contextid' => $contextid));
$DB->delete_records('filter_config', array('contextid' => $contextid));
}
/**
* Does this filter have a global settings page in the admin tree?
* (The settings page for a filter must be called, for example, filtersettingfiltertex.)
*
* @param string $filter The filter name, for example 'tex'.
* @return boolean Whether there should be a 'Settings' link on the config page.
*/
function filter_has_global_settings($filter) {
global $CFG;
$settingspath = $CFG->dirroot . '/filter/' . $filter . '/settings.php';
if (is_readable($settingspath)) {
return true;
}
$settingspath = $CFG->dirroot . '/filter/' . $filter . '/filtersettings.php';
return is_readable($settingspath);
}
/**
* Does this filter have local (per-context) settings?
*
* @param string $filter The filter name, for example 'tex'.
* @return boolean Whether there should be a 'Settings' link on the manage filters in context page.
*/
function filter_has_local_settings($filter) {
global $CFG;
$settingspath = $CFG->dirroot . '/filter/' . $filter . '/filterlocalsettings.php';
return is_readable($settingspath);
}
/**
* Certain types of context (block and user) may not have local filter settings.
* the function checks a context to see whether it may have local config.
*
* @param object $context a context.
* @return boolean whether this context may have local filter settings.
*/
function filter_context_may_have_filter_settings($context) {
return $context->contextlevel != CONTEXT_BLOCK && $context->contextlevel != CONTEXT_USER;
}
/**
* Process phrases intelligently found within a HTML text (such as adding links).
*
* @staticvar array $usedpharses
* @param string $text the text that we are filtering
* @param array $link_array an array of filterobjects
* @param array $ignoretagsopen an array of opening tags that we should ignore while filtering
* @param array $ignoretagsclose an array of corresponding closing tags
* @param bool $overridedefaultignore True to only use tags provided by arguments
* @return string
**/
function filter_phrases($text, &$link_array, $ignoretagsopen=NULL, $ignoretagsclose=NULL,
$overridedefaultignore=false) {
global $CFG;
static $usedphrases;
$ignoretags = array(); // To store all the enclosig tags to be completely ignored.
$tags = array(); // To store all the simple tags to be ignored.
if (!$overridedefaultignore) {
// A list of open/close tags that we should not replace within
// Extended to include <script>, <textarea>, <select> and <a> tags
// Regular expression allows tags with or without attributes
$filterignoretagsopen = array('<head>' , '<nolink>' , '<span class="nolink">',
'<script(\s[^>]*?)?>', '<textarea(\s[^>]*?)?>',
'<select(\s[^>]*?)?>', '<a(\s[^>]*?)?>');
$filterignoretagsclose = array('</head>', '</nolink>', '</span>',
'</script>', '</textarea>', '</select>','</a>');
} else {
// Set an empty default list.
$filterignoretagsopen = array();
$filterignoretagsclose = array();
}
// Add the user defined ignore tags to the default list.
if ( is_array($ignoretagsopen) ) {
foreach ($ignoretagsopen as $open) {
$filterignoretagsopen[] = $open;
}
foreach ($ignoretagsclose as $close) {
$filterignoretagsclose[] = $close;
}
}
// Invalid prefixes and suffixes for the fullmatch searches
// Every "word" character, but the underscore, is a invalid suffix or prefix.
// (nice to use this because it includes national characters (accents...) as word characters.
$filterinvalidprefixes = '([^\W_])';
$filterinvalidsuffixes = '([^\W_])';
// Double up some magic chars to avoid "accidental matches"
$text = preg_replace('/([#*%])/','\1\1',$text);
//Remove everything enclosed by the ignore tags from $text
filter_save_ignore_tags($text,$filterignoretagsopen,$filterignoretagsclose,$ignoretags);
// Remove tags from $text
filter_save_tags($text,$tags);
// Time to cycle through each phrase to be linked
$size = sizeof($link_array);
for ($n=0; $n < $size; $n++) {
$linkobject =& $link_array[$n];
// Set some defaults if certain properties are missing
// Properties may be missing if the filterobject class has not been used to construct the object
if (empty($linkobject->phrase)) {
continue;
}
// Avoid integers < 1000 to be linked. See bug 1446.
$intcurrent = intval($linkobject->phrase);
if (!empty($intcurrent) && strval($intcurrent) == $linkobject->phrase && $intcurrent < 1000) {
continue;
}
// All this work has to be done ONLY it it hasn't been done before
if (!$linkobject->work_calculated) {
if (!isset($linkobject->hreftagbegin) or !isset($linkobject->hreftagend)) {
$linkobject->work_hreftagbegin = '<span class="highlight"';
$linkobject->work_hreftagend = '</span>';
} else {
$linkobject->work_hreftagbegin = $linkobject->hreftagbegin;
$linkobject->work_hreftagend = $linkobject->hreftagend;
}
// Double up chars to protect true duplicates
// be cleared up before returning to the user.
$linkobject->work_hreftagbegin = preg_replace('/([#*%])/','\1\1',$linkobject->work_hreftagbegin);
if (empty($linkobject->casesensitive)) {
$linkobject->work_casesensitive = false;
} else {
$linkobject->work_casesensitive = true;
}
if (empty($linkobject->fullmatch)) {
$linkobject->work_fullmatch = false;
} else {
$linkobject->work_fullmatch = true;
}
// Strip tags out of the phrase
$linkobject->work_phrase = strip_tags($linkobject->phrase);
// Double up chars that might cause a false match -- the duplicates will
// be cleared up before returning to the user.
$linkobject->work_phrase = preg_replace('/([#*%])/','\1\1',$linkobject->work_phrase);
// Set the replacement phrase properly
if ($linkobject->replacementphrase) { //We have specified a replacement phrase
// Strip tags
$linkobject->work_replacementphrase = strip_tags($linkobject->replacementphrase);
} else { //The replacement is the original phrase as matched below
$linkobject->work_replacementphrase = '$1';
}
// Quote any regular expression characters and the delimiter in the work phrase to be searched
$linkobject->work_phrase = preg_quote($linkobject->work_phrase, '/');
// Work calculated
$linkobject->work_calculated = true;
}
// If $CFG->filtermatchoneperpage, avoid previously (request) linked phrases
if (!empty($CFG->filtermatchoneperpage)) {
if (!empty($usedphrases) && in_array($linkobject->work_phrase,$usedphrases)) {
continue;
}
}
// Regular expression modifiers
$modifiers = ($linkobject->work_casesensitive) ? 's' : 'isu'; // works in unicode mode!
// Do we need to do a fullmatch?
// If yes then go through and remove any non full matching entries
if ($linkobject->work_fullmatch) {
$notfullmatches = array();
$regexp = '/'.$filterinvalidprefixes.'('.$linkobject->work_phrase.')|('.$linkobject->work_phrase.')'.$filterinvalidsuffixes.'/'.$modifiers;
preg_match_all($regexp,$text,$list_of_notfullmatches);
if ($list_of_notfullmatches) {
foreach (array_unique($list_of_notfullmatches[0]) as $key=>$value) {
$notfullmatches['<*'.$key.'*>'] = $value;
}
if (!empty($notfullmatches)) {
$text = str_replace($notfullmatches,array_keys($notfullmatches),$text);
}
}
}
// Finally we do our highlighting
if (!empty($CFG->filtermatchonepertext) || !empty($CFG->filtermatchoneperpage)) {
$resulttext = preg_replace('/('.$linkobject->work_phrase.')/'.$modifiers,
$linkobject->work_hreftagbegin.
$linkobject->work_replacementphrase.
$linkobject->work_hreftagend, $text, 1);
} else {
$resulttext = preg_replace('/('.$linkobject->work_phrase.')/'.$modifiers,
$linkobject->work_hreftagbegin.
$linkobject->work_replacementphrase.
$linkobject->work_hreftagend, $text);
}
// If the text has changed we have to look for links again
if ($resulttext != $text) {
// Set $text to $resulttext
$text = $resulttext;
// Remove everything enclosed by the ignore tags from $text
filter_save_ignore_tags($text,$filterignoretagsopen,$filterignoretagsclose,$ignoretags);
// Remove tags from $text
filter_save_tags($text,$tags);
// If $CFG->filtermatchoneperpage, save linked phrases to request
if (!empty($CFG->filtermatchoneperpage)) {
$usedphrases[] = $linkobject->work_phrase;
}
}
// Replace the not full matches before cycling to next link object
if (!empty($notfullmatches)) {
$text = str_replace(array_keys($notfullmatches),$notfullmatches,$text);
unset($notfullmatches);
}
}
// Rebuild the text with all the excluded areas
if (!empty($tags)) {
$text = str_replace(array_keys($tags), $tags, $text);
}
if (!empty($ignoretags)) {
$ignoretags = array_reverse($ignoretags); // Reversed so "progressive" str_replace() will solve some nesting problems.
$text = str_replace(array_keys($ignoretags),$ignoretags,$text);
}
// Remove the protective doubleups
$text = preg_replace('/([#*%])(\1)/','\1',$text);
// Add missing javascript for popus
$text = filter_add_javascript($text);
return $text;
}
/**
* @todo Document this function
* @param array $linkarray
* @return array
*/
function filter_remove_duplicates($linkarray) {
$concepts = array(); // keep a record of concepts as we cycle through
$lconcepts = array(); // a lower case version for case insensitive
$cleanlinks = array();
foreach ($linkarray as $key=>$filterobject) {
if ($filterobject->casesensitive) {
$exists = in_array($filterobject->phrase, $concepts);
} else {
$exists = in_array(core_text::strtolower($filterobject->phrase), $lconcepts);
}
if (!$exists) {
$cleanlinks[] = $filterobject;
$concepts[] = $filterobject->phrase;
$lconcepts[] = core_text::strtolower($filterobject->phrase);
}
}
return $cleanlinks;
}
/**
* Extract open/lose tags and their contents to avoid being processed by filters.
* Useful to extract pieces of code like <a>...</a> tags. It returns the text
* converted with some <#xTEXTFILTER_EXCL_SEPARATORx#> codes replacing the extracted text. Such extracted
* texts are returned in the ignoretags array (as values), with codes as keys.
*
* @param string $text the text that we are filtering (in/out)
* @param array $filterignoretagsopen an array of open tags to start searching
* @param array $filterignoretagsclose an array of close tags to end searching
* @param array $ignoretags an array of saved strings useful to rebuild the original text (in/out)
**/
function filter_save_ignore_tags(&$text, $filterignoretagsopen, $filterignoretagsclose, &$ignoretags) {
// Remove everything enclosed by the ignore tags from $text
foreach ($filterignoretagsopen as $ikey=>$opentag) {
$closetag = $filterignoretagsclose[$ikey];
// form regular expression
$opentag = str_replace('/','\/',$opentag); // delimit forward slashes
$closetag = str_replace('/','\/',$closetag); // delimit forward slashes
$pregexp = '/'.$opentag.'(.*?)'.$closetag.'/is';
preg_match_all($pregexp, $text, $list_of_ignores);
foreach (array_unique($list_of_ignores[0]) as $key=>$value) {
$prefix = (string)(count($ignoretags) + 1);
$ignoretags['<#'.$prefix.TEXTFILTER_EXCL_SEPARATOR.$key.'#>'] = $value;
}
if (!empty($ignoretags)) {
$text = str_replace($ignoretags,array_keys($ignoretags),$text);
}
}
}
/**
* Extract tags (any text enclosed by < and > to avoid being processed by filters.
* It returns the text converted with some <%xTEXTFILTER_EXCL_SEPARATORx%> codes replacing the extracted text. Such extracted
* texts are returned in the tags array (as values), with codes as keys.
*
* @param string $text the text that we are filtering (in/out)
* @param array $tags an array of saved strings useful to rebuild the original text (in/out)
**/
function filter_save_tags(&$text, &$tags) {
preg_match_all('/<([^#%*].*?)>/is',$text,$list_of_newtags);
foreach (array_unique($list_of_newtags[0]) as $ntkey=>$value) {
$prefix = (string)(count($tags) + 1);
$tags['<%'.$prefix.TEXTFILTER_EXCL_SEPARATOR.$ntkey.'%>'] = $value;
}
if (!empty($tags)) {
$text = str_replace($tags,array_keys($tags),$text);
}
}
/**
* Add missing openpopup javascript to HTML files.
*
* @param string $text
* @return string
*/
function filter_add_javascript($text) {
global $CFG;
if (stripos($text, '</html>') === FALSE) {
return $text; // This is not a html file.
}
if (strpos($text, 'onclick="return openpopup') === FALSE) {
return $text; // No popup - no need to add javascript.
}
$js ="
<script type=\"text/javascript\">
<!--
function openpopup(url,name,options,fullscreen) {
fullurl = \"".$CFG->wwwroot."\" + url;
windowobj = window.open(fullurl,name,options);
if (fullscreen) {
windowobj.moveTo(0,0);
windowobj.resizeTo(screen.availWidth,screen.availHeight);
}
windowobj.focus();
return false;
}
// -->
</script>";
if (stripos($text, '</head>') !== FALSE) {
// Try to add it into the head element.
$text = str_ireplace('</head>', $js.'</head>', $text);
return $text;
}
// Last chance - try adding head element.
return preg_replace("/<html.*?>/is", "\\0<head>".$js.'</head>', $text);
}
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