<?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 of functions for web output
*
* Library of all general-purpose Moodle PHP functions and constants
* that produce HTML output
*
* Other main libraries:
* - datalib.php - functions that access the database.
* - moodlelib.php - general-purpose Moodle functions.
*
* @package core
* @subpackage lib
* @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();
// Constants.
// Define text formatting types ... eventually we can add Wiki, BBcode etc.
/**
* Does all sorts of transformations and filtering.
*/
define('FORMAT_MOODLE', '0');
/**
* Plain HTML (with some tags stripped).
*/
define('FORMAT_HTML', '1');
/**
* Plain text (even tags are printed in full).
*/
define('FORMAT_PLAIN', '2');
/**
* Wiki-formatted text.
* Deprecated: left here just to note that '3' is not used (at the moment)
* and to catch any latent wiki-like text (which generates an error)
* @deprecated since 2005!
*/
define('FORMAT_WIKI', '3');
/**
* Markdown-formatted text http://daringfireball.net/projects/markdown/
*/
define('FORMAT_MARKDOWN', '4');
/**
* A moodle_url comparison using this flag will return true if the base URLs match, params are ignored.
*/
define('URL_MATCH_BASE', 0);
/**
* A moodle_url comparison using this flag will return true if the base URLs match and the params of url1 are part of url2.
*/
define('URL_MATCH_PARAMS', 1);
/**
* A moodle_url comparison using this flag will return true if the two URLs are identical, except for the order of the params.
*/
define('URL_MATCH_EXACT', 2);
// Functions.
/**
* Add quotes to HTML characters.
*
* Returns $var with HTML characters (like "<", ">", etc.) properly quoted.
* Related function {@link p()} simply prints the output of this function.
*
* @param string $var the string potentially containing HTML characters
* @return string
*/
function s($var) {
if ($var === false) {
return '0';
}
if ($var === null || $var === '') {
return '';
}
return preg_replace(
'/&#(\d+|x[0-9a-f]+);/i', '&#$1;',
htmlspecialchars($var, ENT_QUOTES | ENT_HTML401 | ENT_SUBSTITUTE)
);
}
/**
* Add quotes to HTML characters.
*
* Prints $var with HTML characters (like "<", ">", etc.) properly quoted.
* This function simply calls & displays {@link s()}.
* @see s()
*
* @param string $var the string potentially containing HTML characters
*/
function p($var) {
echo s($var);
}
/**
* Does proper javascript quoting.
*
* Do not use addslashes anymore, because it does not work when magic_quotes_sybase is enabled.
*
* @param mixed $var String, Array, or Object to add slashes to
* @return mixed quoted result
*/
function addslashes_js($var) {
if (is_string($var)) {
$var = str_replace('\\', '\\\\', $var);
$var = str_replace(array('\'', '"', "\n", "\r", "\0"), array('\\\'', '\\"', '\\n', '\\r', '\\0'), $var);
$var = str_replace('</', '<\/', $var); // XHTML compliance.
} else if (is_array($var)) {
$var = array_map('addslashes_js', $var);
} else if (is_object($var)) {
$a = get_object_vars($var);
foreach ($a as $key => $value) {
$a[$key] = addslashes_js($value);
}
$var = (object)$a;
}
return $var;
}
/**
* Remove query string from url.
*
* Takes in a URL and returns it without the querystring portion.
*
* @param string $url the url which may have a query string attached.
* @return string The remaining URL.
*/
function strip_querystring($url) {
if ($url === null || $url === '') {
return '';
}
if ($commapos = strpos($url, '?')) {
return substr($url, 0, $commapos);
} else {
return $url;
}
}
/**
* Returns the name of the current script, WITH the querystring portion.
*
* This function is necessary because PHP_SELF and REQUEST_URI and SCRIPT_NAME
* return different things depending on a lot of things like your OS, Web
* server, and the way PHP is compiled (ie. as a CGI, module, ISAPI, etc.)
* <b>NOTE:</b> This function returns false if the global variables needed are not set.
*
* @return mixed String or false if the global variables needed are not set.
*/
function me() {
global $ME;
return $ME;
}
/**
* Guesses the full URL of the current script.
*
* This function is using $PAGE->url, but may fall back to $FULLME which
* is constructed from PHP_SELF and REQUEST_URI or SCRIPT_NAME
*
* @return mixed full page URL string or false if unknown
*/
function qualified_me() {
global $FULLME, $PAGE, $CFG;
if (isset($PAGE) and $PAGE->has_set_url()) {
// This is the only recommended way to find out current page.
return $PAGE->url->out(false);
} else {
if ($FULLME === null) {
// CLI script most probably.
return false;
}
if (!empty($CFG->sslproxy)) {
// Return only https links when using SSL proxy.
return preg_replace('/^http:/', 'https:', $FULLME, 1);
} else {
return $FULLME;
}
}
}
/**
* Determines whether or not the Moodle site is being served over HTTPS.
*
* This is done simply by checking the value of $CFG->wwwroot, which seems
* to be the only reliable method.
*
* @return boolean True if site is served over HTTPS, false otherwise.
*/
function is_https() {
global $CFG;
return (strpos($CFG->wwwroot, 'https://') === 0);
}
/**
* Returns the cleaned local URL of the HTTP_REFERER less the URL query string parameters if required.
*
* @param bool $stripquery if true, also removes the query part of the url.
* @return string The resulting referer or empty string.
*/
function get_local_referer($stripquery = true) {
if (isset($_SERVER['HTTP_REFERER'])) {
$referer = clean_param($_SERVER['HTTP_REFERER'], PARAM_LOCALURL);
if ($stripquery) {
return strip_querystring($referer);
} else {
return $referer;
}
} else {
return '';
}
}
/**
* Determine if there is data waiting to be processed from a form
*
* Used on most forms in Moodle to check for data
* Returns the data as an object, if it's found.
* This object can be used in foreach loops without
* casting because it's cast to (array) automatically
*
* Checks that submitted POST data exists and returns it as object.
*
* @return mixed false or object
*/
function data_submitted() {
if (empty($_POST)) {
return false;
} else {
return (object)fix_utf8($_POST);
}
}
/**
* Given some normal text this function will break up any
* long words to a given size by inserting the given character
*
* It's multibyte savvy and doesn't change anything inside html tags.
*
* @param string $string the string to be modified
* @param int $maxsize maximum length of the string to be returned
* @param string $cutchar the string used to represent word breaks
* @return string
*/
function break_up_long_words($string, $maxsize=20, $cutchar=' ') {
// First of all, save all the tags inside the text to skip them.
$tags = array();
filter_save_tags($string, $tags);
// Process the string adding the cut when necessary.
$output = '';
$length = core_text::strlen($string);
$wordlength = 0;
for ($i=0; $i<$length; $i++) {
$char = core_text::substr($string, $i, 1);
if ($char == ' ' or $char == "\t" or $char == "\n" or $char == "\r" or $char == "<" or $char == ">") {
$wordlength = 0;
} else {
$wordlength++;
if ($wordlength > $maxsize) {
$output .= $cutchar;
$wordlength = 0;
}
}
$output .= $char;
}
// Finally load the tags back again.
if (!empty($tags)) {
$output = str_replace(array_keys($tags), $tags, $output);
}
return $output;
}
/**
* Try and close the current window using JavaScript, either immediately, or after a delay.
*
* Echo's out the resulting XHTML & javascript
*
* @param integer $delay a delay in seconds before closing the window. Default 0.
* @param boolean $reloadopener if true, we will see if this window was a pop-up, and try
* to reload the parent window before this one closes.
*/
function close_window($delay = 0, $reloadopener = false) {
global $PAGE, $OUTPUT;
if (!$PAGE->headerprinted) {
$PAGE->set_title(get_string('closewindow'));
echo $OUTPUT->header();
} else {
$OUTPUT->container_end_all(false);
}
if ($reloadopener) {
// Trigger the reload immediately, even if the reload is after a delay.
$PAGE->requires->js_function_call('window.opener.location.reload', array(true));
}
$OUTPUT->notification(get_string('windowclosing'), 'notifysuccess');
$PAGE->requires->js_function_call('close_window', array(new stdClass()), false, $delay);
echo $OUTPUT->footer();
exit;
}
/**
* Returns a string containing a link to the user documentation for the current page.
*
* Also contains an icon by default. Shown to teachers and admin only.
*
* @param string $text The text to be displayed for the link
* @return string The link to user documentation for this current page
*/
function page_doc_link($text='') {
global $OUTPUT, $PAGE;
$path = page_get_doc_link_path($PAGE);
if (!$path) {
return '';
}
return $OUTPUT->doc_link($path, $text);
}
/**
* Returns the path to use when constructing a link to the docs.
*
* @since Moodle 2.5.1 2.6
* @param moodle_page $page
* @return string
*/
function page_get_doc_link_path(moodle_page $page) {
global $CFG;
if (empty($CFG->docroot) || during_initial_install()) {
return '';
}
if (!has_capability('moodle/site:doclinks', $page->context)) {
return '';
}
$path = $page->docspath;
if (!$path) {
return '';
}
return $path;
}
/**
* Validates an email to make sure it makes sense.
*
* @param string $address The email address to validate.
* @return boolean
*/
function validate_email($address) {
global $CFG;
if ($address === null || $address === false || $address === '') {
return false;
}
require_once("{$CFG->libdir}/phpmailer/moodle_phpmailer.php");
return moodle_phpmailer::validateAddress($address ?? '') && !preg_match('/[<>]/', $address);
}
/**
* Extracts file argument either from file parameter or PATH_INFO
*
* Note: $scriptname parameter is not needed anymore
*
* @return string file path (only safe characters)
*/
function get_file_argument() {
global $SCRIPT;
$relativepath = false;
$hasforcedslashargs = false;
if (isset($_SERVER['REQUEST_URI']) && !empty($_SERVER['REQUEST_URI'])) {
// Checks whether $_SERVER['REQUEST_URI'] contains '/pluginfile.php/'
// instead of '/pluginfile.php?', when serving a file from e.g. mod_imscp or mod_scorm.
if ((strpos($_SERVER['REQUEST_URI'], '/pluginfile.php/') !== false)
&& isset($_SERVER['PATH_INFO']) && !empty($_SERVER['PATH_INFO'])) {
// Exclude edge cases like '/pluginfile.php/?file='.
$args = explode('/', ltrim($_SERVER['PATH_INFO'], '/'));
$hasforcedslashargs = (count($args) > 2); // Always at least: context, component and filearea.
}
}
if (!$hasforcedslashargs) {
$relativepath = optional_param('file', false, PARAM_PATH);
}
if ($relativepath !== false and $relativepath !== '') {
return $relativepath;
}
$relativepath = false;
// Then try extract file from the slasharguments.
if (stripos($_SERVER['SERVER_SOFTWARE'], 'iis') !== false) {
// NOTE: IIS tends to convert all file paths to single byte DOS encoding,
// we can not use other methods because they break unicode chars,
// the only ways are to use URL rewriting
// OR
// to properly set the 'FastCGIUtf8ServerVariables' registry key.
if (isset($_SERVER['PATH_INFO']) and $_SERVER['PATH_INFO'] !== '') {
// Check that PATH_INFO works == must not contain the script name.
if (strpos($_SERVER['PATH_INFO'], $SCRIPT) === false) {
$relativepath = clean_param(urldecode($_SERVER['PATH_INFO']), PARAM_PATH);
}
}
} else {
// All other apache-like servers depend on PATH_INFO.
if (isset($_SERVER['PATH_INFO'])) {
if (isset($_SERVER['SCRIPT_NAME']) and strpos($_SERVER['PATH_INFO'], $_SERVER['SCRIPT_NAME']) === 0) {
$relativepath = substr($_SERVER['PATH_INFO'], strlen($_SERVER['SCRIPT_NAME']));
} else {
$relativepath = $_SERVER['PATH_INFO'];
}
$relativepath = clean_param($relativepath, PARAM_PATH);
}
}
return $relativepath;
}
/**
* Just returns an array of text formats suitable for a popup menu
*
* @return array
*/
function format_text_menu() {
return array (FORMAT_MOODLE => get_string('formattext'),
FORMAT_HTML => get_string('formathtml'),
FORMAT_PLAIN => get_string('formatplain'),
FORMAT_MARKDOWN => get_string('formatmarkdown'));
}
/**
* Given text in a variety of format codings, this function returns the text as safe HTML.
*
* This function should mainly be used for long strings like posts,
* answers, glossary items etc. For short strings {@link format_string()}.
*
* <pre>
* Options:
* trusted : If true the string won't be cleaned. Default false required noclean=true.
* noclean : If true the string won't be cleaned, unless $CFG->forceclean is set. Default false required trusted=true.
* filter : If true the string will be run through applicable filters as well. Default true.
* para : If true then the returned string will be wrapped in div tags. Default true.
* newlines : If true then lines newline breaks will be converted to HTML newline breaks. Default true.
* context : The context that will be used for filtering.
* overflowdiv : If set to true the formatted text will be encased in a div
* with the class no-overflow before being returned. Default false.
* allowid : If true then id attributes will not be removed, even when
* using htmlpurifier. Default false.
* blanktarget : If true all <a> tags will have target="_blank" added unless target is explicitly specified.
* </pre>
*
* @param string $text The text to be formatted. This is raw text originally from user input.
* @param int $format Identifier of the text format to be used
* [FORMAT_MOODLE, FORMAT_HTML, FORMAT_PLAIN, FORMAT_MARKDOWN]
* @param stdClass|array $options text formatting options
* @param int $courseiddonotuse deprecated course id, use context option instead
* @return string
*/
function format_text($text, $format = FORMAT_MOODLE, $options = null, $courseiddonotuse = null) {
global $CFG;
// Manually include the formatting class for now until after the release after 4.5 LTS.
require_once("{$CFG->libdir}/classes/formatting.php");
if ($format === FORMAT_WIKI) {
// This format was deprecated in Moodle 1.5.
throw new \coding_exception(
'Wiki-like formatting is not supported.'
);
}
if ($options instanceof \core\context) {
// A common mistake has been to call this function with a context object.
// This has never been expected, or nor supported.
debugging(
'The options argument should not be a context object directly. ' .
' Please pass an array with a context key instead.',
DEBUG_DEVELOPER,
);
$params['context'] = $options;
$options = [];
}
if ($options) {
$options = (array) $options;
}
if (empty($CFG->version) || $CFG->version < 2013051400 || during_initial_install()) {
// Do not filter anything during installation or before upgrade completes.
$params['context'] = null;
} else if ($options && isset($options['context'])) { // First by explicit passed context option.
if (is_numeric($options['context'])) {
// A contextid was passed.
$params['context'] = \core\context::instance_by_id($options['context']);
} else if ($options['context'] instanceof \core\context) {
$params['context'] = $options['context'];
} else {
debugging(
'Unknown context passed to format_text(). Content will not be filtered.',
DEBUG_DEVELOPER,
);
}
// Unset the context from $options to prevent it overriding the configured value.
unset($options['context']);
} else if ($courseiddonotuse) {
// Legacy courseid.
$params['context'] = \core\context\course::instance($courseiddonotuse);
debugging(
"Passing a courseid to format_text() is deprecated, please pass a context instead.",
DEBUG_DEVELOPER,
);
}
$params['text'] = $text;
if ($options) {
// The smiley option was deprecated in Moodle 2.0.
if (array_key_exists('smiley', $options)) {
unset($options['smiley']);
debugging(
'The smiley option is deprecated and no longer used.',
DEBUG_DEVELOPER,
);
}
// The nocache option was deprecated in Moodle 2.3 in MDL-34347.
if (array_key_exists('nocache', $options)) {
unset($options['nocache']);
debugging(
'The nocache option is deprecated and no longer used.',
DEBUG_DEVELOPER,
);
}
$validoptions = [
'text',
'format',
'context',
'trusted',
'clean',
'filter',
'para',
'newlines',
'overflowdiv',
'blanktarget',
'allowid',
'noclean',
];
$invalidoptions = array_diff(array_keys($options), $validoptions);
if ($invalidoptions) {
debugging(sprintf(
'The following options are not valid: %s',
implode(', ', $invalidoptions),
), DEBUG_DEVELOPER);
foreach ($invalidoptions as $option) {
unset($options[$option]);
}
}
foreach ($options as $option => $value) {
$params[$option] = $value;
}
// The noclean option has been renamed to clean.
if (array_key_exists('noclean', $params)) {
$params['clean'] = !$params['noclean'];
unset($params['noclean']);
}
}
if ($format !== null) {
$params['format'] = $format;
}
return \core\di::get(\core\formatting::class)->format_text(...$params);
}
/**
* Resets some data related to filters, called during upgrade or when general filter settings change.
*
* @param bool $phpunitreset true means called from our PHPUnit integration test reset
* @return void
*/
function reset_text_filters_cache($phpunitreset = false) {
global $CFG, $DB;
if ($phpunitreset) {
// HTMLPurifier does not change, DB is already reset to defaults,
// nothing to do here, the dataroot was cleared too.
return;
}
// The purge_all_caches() deals with cachedir and localcachedir purging,
// the individual filter caches are invalidated as necessary elsewhere.
// Update $CFG->filterall cache flag.
if (empty($CFG->stringfilters)) {
set_config('filterall', 0);
return;
}
$installedfilters = core_component::get_plugin_list('filter');
$filters = explode(',', $CFG->stringfilters);
foreach ($filters as $filter) {
if (isset($installedfilters[$filter])) {
set_config('filterall', 1);
return;
}
}
set_config('filterall', 0);
}
/**
* Given a simple string, this function returns the string
* processed by enabled string filters if $CFG->filterall is enabled
*
* This function should be used to print short strings (non html) that
* need filter processing e.g. activity titles, post subjects,
* glossary concepts.
*
* @staticvar bool $strcache
* @param string $string The string to be filtered. Should be plain text, expect
* possibly for multilang tags.
* @param ?bool $striplinks To strip any link in the result text. Moodle 1.8 default changed from false to true! MDL-8713
* @param array $options options array/object or courseid
* @return string
*/
function format_string($string, $striplinks = true, $options = null) {
global $CFG;
// Manually include the formatting class for now until after the release after 4.5 LTS.
require_once("{$CFG->libdir}/classes/formatting.php");
$params = [
'string' => $string,
'striplinks' => (bool) $striplinks,
];
// This method only expects either:
// - an array of options;
// - a stdClass of options to be cast to an array; or
// - an integer courseid.
if ($options instanceof \core\context) {
// A common mistake has been to call this function with a context object.
// This has never been expected, or nor supported.
debugging(
'The options argument should not be a context object directly. ' .
' Please pass an array with a context key instead.',
DEBUG_DEVELOPER,
);
$params['context'] = $options;
$options = [];
} else if (is_numeric($options)) {
// Legacy courseid usage.
$params['context'] = \core\context\course::instance($options);
$options = [];
} else if (is_array($options) || is_a($options, \stdClass::class)) {
$options = (array) $options;
if (isset($options['context'])) {
if (is_numeric($options['context'])) {
// A contextid was passed usage.
$params['context'] = \core\context::instance_by_id($options['context']);
} else if ($options['context'] instanceof \core\context) {
$params['context'] = $options['context'];
} else {
debugging(
'An invalid value for context was provided.',
DEBUG_DEVELOPER,
);
}
}
} else if ($options !== null) {
// Something else was passed, so we'll just use an empty array.
debugging(sprintf(
'The options argument should be an Array, or stdclass. %s passed.',
gettype($options),
), DEBUG_DEVELOPER);
// Attempt to cast to array since we always used to, but throw in some debugging.
$options = array_filter(
(array) $options,
fn ($key) => !is_numeric($key),
ARRAY_FILTER_USE_KEY,
);
}
if (isset($options['filter'])) {
$params['filter'] = (bool) $options['filter'];
} else {
$params['filter'] = true;
}
if (isset($options['escape'])) {
$params['escape'] = (bool) $options['escape'];
} else {
$params['escape'] = true;
}
$validoptions = [
'string',
'striplinks',
'context',
'filter',
'escape',
];
if ($options) {
$invalidoptions = array_diff(array_keys($options), $validoptions);
if ($invalidoptions) {
debugging(sprintf(
'The following options are not valid: %s',
implode(', ', $invalidoptions),
), DEBUG_DEVELOPER);
}
}
return \core\di::get(\core\formatting::class)->format_string(
...$params,
);
}
/**
* Given a string, performs a negative lookahead looking for any ampersand character
* that is not followed by a proper HTML entity. If any is found, it is replaced
* by &. The string is then returned.
*
* @param string $string
* @return string
*/
function replace_ampersands_not_followed_by_entity($string) {
return preg_replace("/\&(?![a-zA-Z0-9#]{1,8};)/", "&", $string ?? '');
}
/**
* Given a string, replaces all <a>.*</a> by .* and returns the string.
*
* @param string $string
* @return string
*/
function strip_links($string) {
return preg_replace('/(<a\s[^>]+?>)(.+?)(<\/a>)/is', '$2', $string);
}
/**
* This expression turns links into something nice in a text format. (Russell Jungwirth)
*
* @param string $string
* @return string
*/
function wikify_links($string) {
return preg_replace('~(<a [^<]*href=["|\']?([^ "\']*)["|\']?[^>]*>([^<]*)</a>)~i', '$3 [ $2 ]', $string);
}
/**
* Given text in a variety of format codings, this function returns the text as plain text suitable for plain email.
*
* @param string $text The text to be formatted. This is raw text originally from user input.
* @param int $format Identifier of the text format to be used
* [FORMAT_MOODLE, FORMAT_HTML, FORMAT_PLAIN, FORMAT_WIKI, FORMAT_MARKDOWN]
* @return string
*/
function format_text_email($text, $format) {
switch ($format) {
case FORMAT_PLAIN:
return $text;
break;
case FORMAT_WIKI:
// There should not be any of these any more!
$text = wikify_links($text);
return core_text::entities_to_utf8(strip_tags($text), true);
break;
case FORMAT_HTML:
return html_to_text($text);
break;
case FORMAT_MOODLE:
case FORMAT_MARKDOWN:
default:
$text = wikify_links($text);
return core_text::entities_to_utf8(strip_tags($text), true);
break;
}
}
/**
* Formats activity intro text
*
* @param string $module name of module
* @param object $activity instance of activity
* @param int $cmid course module id
* @param bool $filter filter resulting html text
* @return string
*/
function format_module_intro($module, $activity, $cmid, $filter=true) {
global $CFG;
require_once("$CFG->libdir/filelib.php");
$context = context_module::instance($cmid);
$options = array('noclean' => true, 'para' => false, 'filter' => $filter, 'context' => $context, 'overflowdiv' => true);
$intro = file_rewrite_pluginfile_urls($activity->intro, 'pluginfile.php', $context->id, 'mod_'.$module, 'intro', null);
return trim(format_text($intro, $activity->introformat, $options, null));
}
/**
* Removes the usage of Moodle files from a text.
*
* In some rare cases we need to re-use a text that already has embedded links
* to some files hosted within Moodle. But the new area in which we will push
* this content does not support files... therefore we need to remove those files.
*
* @param string $source The text
* @return string The stripped text
*/
function strip_pluginfile_content($source) {
$baseurl = '@@PLUGINFILE@@';
// Looking for something like < .* "@@pluginfile@@.*" .* >
$pattern = '$<[^<>]+["\']' . $baseurl . '[^"\']*["\'][^<>]*>$';
$stripped = preg_replace($pattern, '', $source);
// Use purify html to rebalence potentially mismatched tags and generally cleanup.
return purify_html($stripped);
}
/**
* Legacy function, used for cleaning of old forum and glossary text only.
*
* @param string $text text that may contain legacy TRUSTTEXT marker
* @return string text without legacy TRUSTTEXT marker
*/
function trusttext_strip($text) {
if (!is_string($text)) {
// This avoids the potential for an endless loop below.
throw new coding_exception('trusttext_strip parameter must be a string');
}
while (true) { // Removing nested TRUSTTEXT.
$orig = $text;
$text = str_replace('#####TRUSTTEXT#####', '', $text);
if (strcmp($orig, $text) === 0) {
return $text;
}
}
}
/**
* Must be called before editing of all texts with trust flag. Removes all XSS nasties from texts stored in database if needed.
*
* @param stdClass $object data object with xxx, xxxformat and xxxtrust fields
* @param string $field name of text field
* @param context $context active context
* @return stdClass updated $object
*/
function trusttext_pre_edit($object, $field, $context) {
$trustfield = $field.'trust';
$formatfield = $field.'format';
if ($object->$formatfield == FORMAT_MARKDOWN) {
// We do not have a way to sanitise Markdown texts,
// luckily editors for this format should not have XSS problems.
return $object;
}
if (!$object->$trustfield or !trusttext_trusted($context)) {
$object->$field = clean_text($object->$field, $object->$formatfield);
}
return $object;
}
/**
* Is current user trusted to enter no dangerous XSS in this context?
*
* Please note the user must be in fact trusted everywhere on this server!!
*
* @param context $context
* @return bool true if user trusted
*/
function trusttext_trusted($context) {
return (trusttext_active() and has_capability('moodle/site:trustcontent', $context));
}
/**
* Is trusttext feature active?
*
* @return bool
*/
function trusttext_active() {
global $CFG;
return !empty($CFG->enabletrusttext);
}
/**
* Cleans raw text removing nasties.
*
* Given raw text (eg typed in by a user) this function cleans it up and removes any nasty tags that could mess up
* Moodle pages through XSS attacks.
*
* The result must be used as a HTML text fragment, this function can not cleanup random
* parts of html tags such as url or src attributes.
*
* NOTE: the format parameter was deprecated because we can safely clean only HTML.
*
* @param string $text The text to be cleaned
* @param int|string $format deprecated parameter, should always contain FORMAT_HTML or FORMAT_MOODLE
* @param array $options Array of options; currently only option supported is 'allowid' (if true,
* does not remove id attributes when cleaning)
* @return string The cleaned up text
*/
function clean_text($text, $format = FORMAT_HTML, $options = array()) {
$text = (string)$text;
if ($format != FORMAT_HTML and $format != FORMAT_HTML) {
// TODO: we need to standardise cleanup of text when loading it into editor first.
// debugging('clean_text() is designed to work only with html');.
}
if ($format == FORMAT_PLAIN) {
return $text;
}
if (is_purify_html_necessary($text)) {
$text = purify_html($text, $options);
}
// Originally we tried to neutralise some script events here, it was a wrong approach because
// it was trivial to work around that (for example using style based XSS exploits).
// We must not give false sense of security here - all developers MUST understand how to use
// rawurlencode(), htmlentities(), htmlspecialchars(), p(), s(), moodle_url, html_writer and friends!!!
return $text;
}
/**
* Is it necessary to use HTMLPurifier?
*
* @private
* @param string $text
* @return bool false means html is safe and valid, true means use HTMLPurifier
*/
function is_purify_html_necessary($text) {
if ($text === '') {
return false;
}
if ($text === (string)((int)$text)) {
return false;
}
if (strpos($text, '&') !== false or preg_match('|<[^pesb/]|', $text)) {
// We need to normalise entities or other tags except p, em, strong and br present.
return true;
}
$altered = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8', true);
if ($altered === $text) {
// No < > or other special chars means this must be safe.
return false;
}
// Let's try to convert back some safe html tags.
$altered = preg_replace('|<p>(.*?)</p>|m', '<p>$1</p>', $altered);
if ($altered === $text) {
return false;
}
$altered = preg_replace('|<em>([^<>]+?)</em>|m', '<em>$1</em>', $altered);
if ($altered === $text) {
return false;
}
$altered = preg_replace('|<strong>([^<>]+?)</strong>|m', '<strong>$1</strong>', $altered);
if ($altered === $text) {
return false;
}
$altered = str_replace('<br />', '<br />', $altered);
if ($altered === $text) {
return false;
}
return true;
}
/**
* KSES replacement cleaning function - uses HTML Purifier.
*
* @param string $text The (X)HTML string to purify
* @param array $options Array of options; currently only option supported is 'allowid' (if set,
* does not remove id attributes when cleaning)
* @return string
*/
function purify_html($text, $options = array()) {
global $CFG;
$text = (string)$text;
static $purifiers = array();
static $caches = array();
// Purifier code can change only during major version upgrade.
$version = empty($CFG->version) ? 0 : $CFG->version;
$cachedir = "$CFG->localcachedir/htmlpurifier/$version";
if (!file_exists($cachedir)) {
// Purging of caches may remove the cache dir at any time,
// luckily file_exists() results should be cached for all existing directories.
$purifiers = array();
$caches = array();
gc_collect_cycles();
make_localcache_directory('htmlpurifier', false);
check_dir_exists($cachedir);
}
$allowid = empty($options['allowid']) ? 0 : 1;
$allowobjectembed = empty($CFG->allowobjectembed) ? 0 : 1;
$type = 'type_'.$allowid.'_'.$allowobjectembed;
if (!array_key_exists($type, $caches)) {
$caches[$type] = cache::make('core', 'htmlpurifier', array('type' => $type));
}
$cache = $caches[$type];
// Add revision number and all options to the text key so that it is compatible with local cluster node caches.
$key = "|$version|$allowobjectembed|$allowid|$text";
$filteredtext = $cache->get($key);
if ($filteredtext === true) {
// The filtering did not change the text last time, no need to filter anything again.
return $text;
} else if ($filteredtext !== false) {
return $filteredtext;
}
if (empty($purifiers[$type])) {
require_once $CFG->libdir.'/htmlpurifier/HTMLPurifier.safe-includes.php';
require_once $CFG->libdir.'/htmlpurifier/locallib.php';
$config = HTMLPurifier_Config::createDefault();
$config->set('HTML.DefinitionID', 'moodlehtml');
$config->set('HTML.DefinitionRev', 7);
$config->set('Cache.SerializerPath', $cachedir);
$config->set('Cache.SerializerPermissions', $CFG->directorypermissions);
$config->set('Core.NormalizeNewlines', false);
$config->set('Core.ConvertDocumentToFragment', true);
$config->set('Core.Encoding', 'UTF-8');
$config->set('HTML.Doctype', 'XHTML 1.0 Transitional');
$config->set('URI.AllowedSchemes', array(
'http' => true,
'https' => true,
'ftp' => true,
'irc' => true,
'nntp' => true,
'news' => true,
'rtsp' => true,
'rtmp' => true,
'teamspeak' => true,
'gopher' => true,
'mms' => true,
'mailto' => true
));
$config->set('Attr.AllowedFrameTargets', array('_blank'));
if ($allowobjectembed) {
$config->set('HTML.SafeObject', true);
$config->set('Output.FlashCompat', true);
$config->set('HTML.SafeEmbed', true);
}
if ($allowid) {
$config->set('Attr.EnableID', true);
}
if ($def = $config->maybeGetRawHTMLDefinition()) {
$def->addElement('nolink', 'Inline', 'Flow', array()); // Skip our filters inside.
$def->addElement('tex', 'Inline', 'Inline', array()); // Tex syntax, equivalent to $$xx$$.
$def->addElement('algebra', 'Inline', 'Inline', array()); // Algebra syntax, equivalent to @@xx@@.
$def->addElement('lang', 'Block', 'Flow', array(), array('lang'=>'CDATA')); // Original multilang style - only our hacked lang attribute.
$def->addAttribute('span', 'xxxlang', 'CDATA'); // Current very problematic multilang.
// Enable the bidirectional isolate element and its span equivalent.
$def->addElement('bdi', 'Inline', 'Flow', 'Common');
$def->addAttribute('span', 'dir', 'Enum#ltr,rtl,auto');
// Media elements.
// https://html.spec.whatwg.org/#the-video-element
$def->addElement('video', 'Inline', 'Optional: #PCDATA | Flow | source | track', 'Common', [
'src' => 'URI',
'crossorigin' => 'Enum#anonymous,use-credentials',
'poster' => 'URI',
'preload' => 'Enum#auto,metadata,none',
'autoplay' => 'Bool',
'playsinline' => 'Bool',
'loop' => 'Bool',
'muted' => 'Bool',
'controls' => 'Bool',
'width' => 'Length',
'height' => 'Length',
]);
// https://html.spec.whatwg.org/#the-audio-element
$def->addElement('audio', 'Inline', 'Optional: #PCDATA | Flow | source | track', 'Common', [
'src' => 'URI',
'crossorigin' => 'Enum#anonymous,use-credentials',
'preload' => 'Enum#auto,metadata,none',
'autoplay' => 'Bool',
'loop' => 'Bool',
'muted' => 'Bool',
'controls' => 'Bool'
]);
// https://html.spec.whatwg.org/#the-source-element
$def->addElement('source', false, 'Empty', null, [
'src' => 'URI',
'type' => 'Text'
]);
// https://html.spec.whatwg.org/#the-track-element
$def->addElement('track', false, 'Empty', null, [
'src' => 'URI',
'kind' => 'Enum#subtitles,captions,descriptions,chapters,metadata',
'srclang' => 'Text',
'label' => 'Text',
'default' => 'Bool',
]);
// Use the built-in Ruby module to add annotation support.
$def->manager->addModule(new HTMLPurifier_HTMLModule_Ruby());
}
$purifier = new HTMLPurifier($config);
$purifiers[$type] = $purifier;
} else {
$purifier = $purifiers[$type];
}
$multilang = (strpos($text, 'class="multilang"') !== false);
$filteredtext = $text;
if ($multilang) {
$filteredtextregex = '/<span(\s+lang="([a-zA-Z0-9_-]+)"|\s+class="multilang"){2}\s*>/';
$filteredtext = preg_replace($filteredtextregex, '<span xxxlang="${2}">', $filteredtext);
}
$filteredtext = (string)$purifier->purify($filteredtext);
if ($multilang) {
$filteredtext = preg_replace('/<span xxxlang="([a-zA-Z0-9_-]+)">/', '<span lang="${1}" class="multilang">', $filteredtext);
}
if ($text === $filteredtext) {
// No need to store the filtered text, next time we will just return unfiltered text
// because it was not changed by purifying.
$cache->set($key, true);
} else {
$cache->set($key, $filteredtext);
}
return $filteredtext;
}
/**
* Given plain text, makes it into HTML as nicely as possible.
*
* May contain HTML tags already.
*
* Do not abuse this function. It is intended as lower level formatting feature used
* by {@link format_text()} to convert FORMAT_MOODLE to HTML. You are supposed
* to call format_text() in most of cases.
*
* @param string $text The string to convert.
* @param boolean $smileyignored Was used to determine if smiley characters should convert to smiley images, ignored now
* @param boolean $para If true then the returned string will be wrapped in div tags
* @param boolean $newlines If true then lines newline breaks will be converted to HTML newline breaks.
* @return string
*/
function text_to_html($text, $smileyignored = null, $para = true, $newlines = true) {
// Remove any whitespace that may be between HTML tags.
$text = preg_replace("~>([[:space:]]+)<~i", "><", $text);
// Remove any returns that precede or follow HTML tags.
$text = preg_replace("~([\n\r])<~i", " <", $text);
$text = preg_replace("~>([\n\r])~i", "> ", $text);
// Make returns into HTML newlines.
if ($newlines) {
$text = nl2br($text);
}
// Wrap the whole thing in a div if required.
if ($para) {
// In 1.9 this was changed from a p => div.
return '<div class="text_to_html">'.$text.'</div>';
} else {
return $text;
}
}
/**
* Given Markdown formatted text, make it into XHTML using external function
*
* @param string $text The markdown formatted text to be converted.
* @return string Converted text
*/
function markdown_to_html($text) {
global $CFG;
if ($text === '' or $text === null) {
return $text;
}
require_once($CFG->libdir .'/markdown/MarkdownInterface.php');
require_once($CFG->libdir .'/markdown/Markdown.php');
require_once($CFG->libdir .'/markdown/MarkdownExtra.php');
return \Michelf\MarkdownExtra::defaultTransform($text);
}
/**
* Given HTML text, make it into plain text using external function
*
* @param string $html The text to be converted.
* @param integer $width Width to wrap the text at. (optional, default 75 which
* is a good value for email. 0 means do not limit line length.)
* @param boolean $dolinks By default, any links in the HTML are collected, and
* printed as a list at the end of the HTML. If you don't want that, set this
* argument to false.
* @return string plain text equivalent of the HTML.
*/
function html_to_text($html, $width = 75, $dolinks = true) {
global $CFG;
require_once($CFG->libdir .'/html2text/lib.php');
$options = array(
'width' => $width,
'do_links' => 'table',
);
if (empty($dolinks)) {
$options['do_links'] = 'none';
}
$h2t = new core_html2text($html, $options);
$result = $h2t->getText();
return $result;
}
/**
* Converts texts or strings to plain text.
*
* - When used to convert user input introduced in an editor the text format needs to be passed in $contentformat like we usually
* do in format_text.
* - When this function is used for strings that are usually passed through format_string before displaying them
* we need to set $contentformat to false. This will execute html_to_text as these strings can contain multilang tags if
* multilang filter is applied to headings.
*
* @param string $content The text as entered by the user
* @param int|false $contentformat False for strings or the text format: FORMAT_MOODLE/FORMAT_HTML/FORMAT_PLAIN/FORMAT_MARKDOWN
* @return string Plain text.
*/
function content_to_text($content, $contentformat) {
switch ($contentformat) {
case FORMAT_PLAIN:
// Nothing here.
break;
case FORMAT_MARKDOWN:
$content = markdown_to_html($content);
$content = html_to_text($content, 75, false);
break;
default:
// FORMAT_HTML, FORMAT_MOODLE and $contentformat = false, the later one are strings usually formatted through
// format_string, we need to convert them from html because they can contain HTML (multilang filter).
$content = html_to_text($content, 75, false);
}
return trim($content, "\r\n ");
}
/**
* Factory method for extracting draft file links from arbitrary text using regular expressions. Only text
* is required; other file fields may be passed to filter.
*
* @param string $text Some html content.
* @param bool $forcehttps force https urls.
* @param int $contextid This parameter and the next three identify the file area to save to.
* @param string $component The component name.
* @param string $filearea The filearea.
* @param int $itemid The item id for the filearea.
* @param string $filename The specific filename of the file.
* @return array
*/
function extract_draft_file_urls_from_text($text, $forcehttps = false, $contextid = null, $component = null,
$filearea = null, $itemid = null, $filename = null) {
global $CFG;
$wwwroot = $CFG->wwwroot;
if ($forcehttps) {
$wwwroot = str_replace('http://', 'https://', $wwwroot);
}
$urlstring = '/' . preg_quote($wwwroot, '/');
$urlbase = preg_quote('draftfile.php');
$urlstring .= "\/(?<urlbase>{$urlbase})";
if (is_null($contextid)) {
$contextid = '[0-9]+';
}
$urlstring .= "\/(?<contextid>{$contextid})";
if (is_null($component)) {
$component = '[a-z_]+';
}
$urlstring .= "\/(?<component>{$component})";
if (is_null($filearea)) {
$filearea = '[a-z_]+';
}
$urlstring .= "\/(?<filearea>{$filearea})";
if (is_null($itemid)) {
$itemid = '[0-9]+';
}
$urlstring .= "\/(?<itemid>{$itemid})";
// Filename matching magic based on file_rewrite_urls_to_pluginfile().
if (is_null($filename)) {
$filename = '[^\'\",&<>|`\s:\\\\]+';
}
$urlstring .= "\/(?<filename>{$filename})/";
// Regular expression which matches URLs and returns their components.
preg_match_all($urlstring, $text, $urls, PREG_SET_ORDER);
return $urls;
}
/**
* This function will highlight search words in a given string
*
* It cares about HTML and will not ruin links. It's best to use
* this function after performing any conversions to HTML.
*
* @param string $needle The search string. Syntax like "word1 +word2 -word3" is dealt with correctly.
* @param string $haystack The string (HTML) within which to highlight the search terms.
* @param boolean $matchcase whether to do case-sensitive. Default case-insensitive.
* @param string $prefix the string to put before each search term found.
* @param string $suffix the string to put after each search term found.
* @return string The highlighted HTML.
*/
function highlight($needle, $haystack, $matchcase = false,
$prefix = '<span class="highlight">', $suffix = '</span>') {
// Quick bail-out in trivial cases.
if (empty($needle) or empty($haystack)) {
return $haystack;
}
// Break up the search term into words, discard any -words and build a regexp.
$words = preg_split('/ +/', trim($needle));
foreach ($words as $index => $word) {
if (strpos($word, '-') === 0) {
unset($words[$index]);
} else if (strpos($word, '+') === 0) {
$words[$index] = '\b' . preg_quote(ltrim($word, '+'), '/') . '\b'; // Match only as a complete word.
} else {
$words[$index] = preg_quote($word, '/');
}
}
$regexp = '/(' . implode('|', $words) . ')/u'; // Char u is to do UTF-8 matching.
if (!$matchcase) {
$regexp .= 'i';
}
// Another chance to bail-out if $search was only -words.
if (empty($words)) {
return $haystack;
}
// Split the string into HTML tags and real content.
$chunks = preg_split('/((?:<[^>]*>)+)/', $haystack, -1, PREG_SPLIT_DELIM_CAPTURE);
// We have an array of alternating blocks of text, then HTML tags, then text, ...
// Loop through replacing search terms in the text, and leaving the HTML unchanged.
$ishtmlchunk = false;
$result = '';
foreach ($chunks as $chunk) {
if ($ishtmlchunk) {
$result .= $chunk;
} else {
$result .= preg_replace($regexp, $prefix . '$1' . $suffix, $chunk);
}
$ishtmlchunk = !$ishtmlchunk;
}
return $result;
}
/**
* This function will highlight instances of $needle in $haystack
*
* It's faster that the above function {@link highlight()} and doesn't care about
* HTML or anything.
*
* @param string $needle The string to search for
* @param string $haystack The string to search for $needle in
* @return string The highlighted HTML
*/
function highlightfast($needle, $haystack) {
if (empty($needle) or empty($haystack)) {
return $haystack;
}
$parts = explode(core_text::strtolower($needle), core_text::strtolower($haystack));
if (count($parts) === 1) {
return $haystack;
}
$pos = 0;
foreach ($parts as $key => $part) {
$parts[$key] = substr($haystack, $pos, strlen($part));
$pos += strlen($part);
$parts[$key] .= '<span class="highlight">'.substr($haystack, $pos, strlen($needle)).'</span>';
$pos += strlen($needle);
}
return str_replace('<span class="highlight"></span>', '', join('', $parts));
}
/**
* Converts a language code to hyphen-separated format in accordance to the
* {@link https://datatracker.ietf.org/doc/html/rfc5646#section-2.1 BCP47 syntax}.
*
* For additional information, check out
* {@link https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/lang MDN web docs - lang}.
*
* @param string $langcode The language code to convert.
* @return string
*/
function get_html_lang_attribute_value(string $langcode): string {
$langcode = clean_param($langcode, PARAM_LANG);
if ($langcode === '') {
return 'en';
}
// Grab language ISO code from lang config. If it differs from English, then it's been specified and we can return it.
$langiso = (string) (new lang_string('iso6391', 'core_langconfig', null, $langcode));
if ($langiso !== 'en') {
return $langiso;
}
// Where we cannot determine the value from lang config, use the first two characters from the lang code.
return substr($langcode, 0, 2);
}
/**
* Return a string containing 'lang', xml:lang and optionally 'dir' HTML attributes.
*
* Internationalisation, for print_header and backup/restorelib.
*
* @param bool $dir Default false
* @return string Attributes
*/
function get_html_lang($dir = false) {
global $CFG;
$currentlang = current_language();
if (isset($CFG->lang) && $currentlang !== $CFG->lang && !get_string_manager()->translation_exists($currentlang)) {
// Use the default site language when the current language is not available.
$currentlang = $CFG->lang;
// Fix the current language.
fix_current_language($currentlang);
}
$direction = '';
if ($dir) {
if (right_to_left()) {
$direction = ' dir="rtl"';
} else {
$direction = ' dir="ltr"';
}
}
// Accessibility: added the 'lang' attribute to $direction, used in theme <html> tag.
$language = get_html_lang_attribute_value($currentlang);
@header('Content-Language: '.$language);
return ($direction.' lang="'.$language.'" xml:lang="'.$language.'"');
}
// STANDARD WEB PAGE PARTS.
/**
* Send the HTTP headers that Moodle requires.
*
* There is a backwards compatibility hack for legacy code
* that needs to add custom IE compatibility directive.
*
* Example:
* <code>
* if (!isset($CFG->additionalhtmlhead)) {
* $CFG->additionalhtmlhead = '';
* }
* $CFG->additionalhtmlhead .= '<meta http-equiv="X-UA-Compatible" content="IE=8" />';
* header('X-UA-Compatible: IE=8');
* echo $OUTPUT->header();
* </code>
*
* Please note the $CFG->additionalhtmlhead alone might not work,
* you should send the IE compatibility header() too.
*
* @param string $contenttype
* @param bool $cacheable Can this page be cached on back?
* @return void, sends HTTP headers
*/
function send_headers($contenttype, $cacheable = true) {
global $CFG;
@header('Content-Type: ' . $contenttype);
@header('Content-Script-Type: text/javascript');
@header('Content-Style-Type: text/css');
if (empty($CFG->additionalhtmlhead) or stripos($CFG->additionalhtmlhead, 'X-UA-Compatible') === false) {
@header('X-UA-Compatible: IE=edge');
}
if ($cacheable) {
// Allow caching on "back" (but not on normal clicks).
@header('Cache-Control: private, pre-check=0, post-check=0, max-age=0, no-transform');
@header('Pragma: no-cache');
@header('Expires: ');
} else {
// Do everything we can to always prevent clients and proxies caching.
@header('Cache-Control: no-store, no-cache, must-revalidate');
@header('Cache-Control: post-check=0, pre-check=0, no-transform', false);
@header('Pragma: no-cache');
@header('Expires: Mon, 20 Aug 1969 09:23:00 GMT');
@header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
}
@header('Accept-Ranges: none');
// The Moodle app must be allowed to embed content always.
if (empty($CFG->allowframembedding) && !core_useragent::is_moodle_app()) {
@header('X-Frame-Options: sameorigin');
}
// If referrer policy is set, add a referrer header.
if (!empty($CFG->referrerpolicy) && ($CFG->referrerpolicy !== 'default')) {
@header('Referrer-Policy: ' . $CFG->referrerpolicy);
}
}
/**
* Return the right arrow with text ('next'), and optionally embedded in a link.
*
* @param string $text HTML/plain text label (set to blank only for breadcrumb separator cases).
* @param string $url An optional link to use in a surrounding HTML anchor.
* @param bool $accesshide True if text should be hidden (for screen readers only).
* @param string $addclass Additional class names for the link, or the arrow character.
* @return string HTML string.
*/
function link_arrow_right($text, $url='', $accesshide=false, $addclass='', $addparams = []) {
global $OUTPUT; // TODO: move to output renderer.
$arrowclass = 'arrow ';
if (!$url) {
$arrowclass .= $addclass;
}
$arrow = '<span class="'.$arrowclass.'" aria-hidden="true">'.$OUTPUT->rarrow().'</span>';
$htmltext = '';
if ($text) {
$htmltext = '<span class="arrow_text">'.$text.'</span> ';
if ($accesshide) {
$htmltext = get_accesshide($htmltext);
}
}
if ($url) {
$class = 'arrow_link';
if ($addclass) {
$class .= ' '.$addclass;
}
$linkparams = [
'class' => $class,
'href' => $url,
'title' => preg_replace('/<.*?>/', '', $text),
];
$linkparams += $addparams;
return html_writer::link($url, $htmltext . $arrow, $linkparams);
}
return $htmltext.$arrow;
}
/**
* Return the left arrow with text ('previous'), and optionally embedded in a link.
*
* @param string $text HTML/plain text label (set to blank only for breadcrumb separator cases).
* @param string $url An optional link to use in a surrounding HTML anchor.
* @param bool $accesshide True if text should be hidden (for screen readers only).
* @param string $addclass Additional class names for the link, or the arrow character.
* @return string HTML string.
*/
function link_arrow_left($text, $url='', $accesshide=false, $addclass='', $addparams = []) {
global $OUTPUT; // TODO: move to utput renderer.
$arrowclass = 'arrow ';
if (! $url) {
$arrowclass .= $addclass;
}
$arrow = '<span class="'.$arrowclass.'" aria-hidden="true">'.$OUTPUT->larrow().'</span>';
$htmltext = '';
if ($text) {
$htmltext = ' <span class="arrow_text">'.$text.'</span>';
if ($accesshide) {
$htmltext = get_accesshide($htmltext);
}
}
if ($url) {
$class = 'arrow_link';
if ($addclass) {
$class .= ' '.$addclass;
}
$linkparams = [
'class' => $class,
'href' => $url,
'title' => preg_replace('/<.*?>/', '', $text),
];
$linkparams += $addparams;
return html_writer::link($url, $arrow . $htmltext, $linkparams);
}
return $arrow.$htmltext;
}
/**
* Return a HTML element with the class "accesshide", for accessibility.
*
* Please use cautiously - where possible, text should be visible!
*
* @param string $text Plain text.
* @param string $elem Lowercase element name, default "span".
* @param string $class Additional classes for the element.
* @param string $attrs Additional attributes string in the form, "name='value' name2='value2'"
* @return string HTML string.
*/
function get_accesshide($text, $elem='span', $class='', $attrs='') {
return "<$elem class=\"accesshide $class\" $attrs>$text</$elem>";
}
/**
* Return the breadcrumb trail navigation separator.
*
* @return string HTML string.
*/
function get_separator() {
// Accessibility: the 'hidden' slash is preferred for screen readers.
return ' '.link_arrow_right($text='/', $url='', $accesshide=true, 'sep').' ';
}
/**
* Print (or return) a collapsible region, that has a caption that can be clicked to expand or collapse the region.
*
* If JavaScript is off, then the region will always be expanded.
*
* @param string $contents the contents of the box.
* @param string $classes class names added to the div that is output.
* @param string $id id added to the div that is output. Must not be blank.
* @param string $caption text displayed at the top. Clicking on this will cause the region to expand or contract.
* @param string $userpref the name of the user preference that stores the user's preferred default state.
* (May be blank if you do not wish the state to be persisted.
* @param boolean $default Initial collapsed state to use if the user_preference it not set.
* @param boolean $return if true, return the HTML as a string, rather than printing it.
* @return string|void If $return is false, returns nothing, otherwise returns a string of HTML.
*/
function print_collapsible_region($contents, $classes, $id, $caption, $userpref = '', $default = false, $return = false) {
$output = print_collapsible_region_start($classes, $id, $caption, $userpref, $default, true);
$output .= $contents;
$output .= print_collapsible_region_end(true);
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Print (or return) the start of a collapsible region
*
* The collapsibleregion has a caption that can be clicked to expand or collapse the region. If JavaScript is off, then the region
* will always be expanded.
*
* @param string $classes class names added to the div that is output.
* @param string $id id added to the div that is output. Must not be blank.
* @param string $caption text displayed at the top. Clicking on this will cause the region to expand or contract.
* @param string $userpref the name of the user preference that stores the user's preferred default state.
* (May be blank if you do not wish the state to be persisted.
* @param boolean $default Initial collapsed state to use if the user_preference it not set.
* @param boolean $return if true, return the HTML as a string, rather than printing it.
* @param string $extracontent the extra content will show next to caption, eg.Help icon.
* @return string|void if $return is false, returns nothing, otherwise returns a string of HTML.
*/
function print_collapsible_region_start($classes, $id, $caption, $userpref = '', $default = false, $return = false,
$extracontent = null) {
global $PAGE;
// Work out the initial state.
if (!empty($userpref) and is_string($userpref)) {
$collapsed = get_user_preferences($userpref, $default);
} else {
$collapsed = $default;
$userpref = false;
}
if ($collapsed) {
$classes .= ' collapsed';
}
$output = '';
$output .= '<div id="' . $id . '" class="collapsibleregion ' . $classes . '">';
$output .= '<div id="' . $id . '_sizer">';
$output .= '<div id="' . $id . '_caption" class="collapsibleregioncaption">';
$output .= $caption . ' </div>';
if ($extracontent) {
$output .= html_writer::div($extracontent, 'collapsibleregionextracontent');
}
$output .= '<div id="' . $id . '_inner" class="collapsibleregioninner">';
$PAGE->requires->js_init_call('M.util.init_collapsible_region', array($id, $userpref, get_string('clicktohideshow')));
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Close a region started with print_collapsible_region_start.
*
* @param boolean $return if true, return the HTML as a string, rather than printing it.
* @return string|void if $return is false, returns nothing, otherwise returns a string of HTML.
*/
function print_collapsible_region_end($return = false) {
$output = '</div></div></div>';
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Print a specified group's avatar.
*
* @param array|stdClass $group A single {@link group} object OR array of groups.
* @param int $courseid The course ID.
* @param boolean $large Default small picture, or large.
* @param boolean $return If false print picture, otherwise return the output as string
* @param boolean $link Enclose image in a link to view specified course?
* @param boolean $includetoken Whether to use a user token when displaying this group image.
* True indicates to generate a token for current user, and integer value indicates to generate a token for the
* user whose id is the value indicated.
* If the group picture is included in an e-mail or some other location where the audience is a specific
* user who will not be logged in when viewing, then we use a token to authenticate the user.
* @return string|void Depending on the setting of $return
*/
function print_group_picture($group, $courseid, $large = false, $return = false, $link = true, $includetoken = false) {
global $CFG;
if (is_array($group)) {
$output = '';
foreach ($group as $g) {
$output .= print_group_picture($g, $courseid, $large, true, $link, $includetoken);
}
if ($return) {
return $output;
} else {
echo $output;
return;
}
}
$pictureurl = get_group_picture_url($group, $courseid, $large, $includetoken);
// If there is no picture, do nothing.
if (!isset($pictureurl)) {
return;
}
$context = context_course::instance($courseid);
$groupname = s($group->name);
$pictureimage = html_writer::img($pictureurl, $groupname, ['title' => $groupname]);
$output = '';
if ($link or has_capability('moodle/site:accessallgroups', $context)) {
$linkurl = new moodle_url('/user/index.php', ['id' => $courseid, 'group' => $group->id]);
$output .= html_writer::link($linkurl, $pictureimage);
} else {
$output .= $pictureimage;
}
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Return the url to the group picture.
*
* @param stdClass $group A group object.
* @param int $courseid The course ID for the group.
* @param bool $large A large or small group picture? Default is small.
* @param boolean $includetoken Whether to use a user token when displaying this group image.
* True indicates to generate a token for current user, and integer value indicates to generate a token for the
* user whose id is the value indicated.
* If the group picture is included in an e-mail or some other location where the audience is a specific
* user who will not be logged in when viewing, then we use a token to authenticate the user.
* @return ?moodle_url Returns the url for the group picture.
*/
function get_group_picture_url($group, $courseid, $large = false, $includetoken = false) {
global $CFG;
$context = context_course::instance($courseid);
// If there is no picture, do nothing.
if (!$group->picture) {
return;
}
if ($large) {
$file = 'f1';
} else {
$file = 'f2';
}
$grouppictureurl = moodle_url::make_pluginfile_url(
$context->id, 'group', 'icon', $group->id, '/', $file, false, $includetoken);
$grouppictureurl->param('rev', $group->picture);
return $grouppictureurl;
}
/**
* Display a recent activity note
*
* @staticvar string $strftimerecent
* @param int $time A timestamp int.
* @param stdClass $user A user object from the database.
* @param string $text Text for display for the note
* @param string $link The link to wrap around the text
* @param bool $return If set to true the HTML is returned rather than echo'd
* @param string $viewfullnames
* @return ?string If $retrun was true returns HTML for a recent activity notice.
*/
function print_recent_activity_note($time, $user, $text, $link, $return=false, $viewfullnames=null) {
static $strftimerecent = null;
$output = '';
if (is_null($viewfullnames)) {
$context = context_system::instance();
$viewfullnames = has_capability('moodle/site:viewfullnames', $context);
}
if (is_null($strftimerecent)) {
$strftimerecent = get_string('strftimerecent');
}
$output .= '<div class="head">';
$output .= '<div class="date">'.userdate($time, $strftimerecent).'</div>';
$output .= '<div class="name">'.fullname($user, $viewfullnames).'</div>';
$output .= '</div>';
$output .= '<div class="info"><a href="'.$link.'">'.format_string($text, true).'</a></div>';
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Returns a popup menu with course activity modules
*
* Given a course this function returns a small popup menu with all the course activity modules in it, as a navigation menu
* outputs a simple list structure in XHTML.
* The data is taken from the serialised array stored in the course record.
*
* @param stdClass $course A course object.
* @param array $sections
* @param course_modinfo $modinfo
* @param string $strsection
* @param string $strjumpto
* @param int $width
* @param string $cmid
* @return string The HTML block
*/
function navmenulist($course, $sections, $modinfo, $strsection, $strjumpto, $width=50, $cmid=0) {
global $CFG, $OUTPUT;
$section = -1;
$menu = array();
$doneheading = false;
$courseformatoptions = course_get_format($course)->get_format_options();
$coursecontext = context_course::instance($course->id);
$menu[] = '<ul class="navmenulist"><li class="jumpto section"><span>'.$strjumpto.'</span><ul>';
foreach ($modinfo->cms as $mod) {
if (!$mod->has_view()) {
// Don't show modules which you can't link to!
continue;
}
// For course formats using 'numsections' do not show extra sections.
if (isset($courseformatoptions['numsections']) && $mod->sectionnum > $courseformatoptions['numsections']) {
break;
}
if (!$mod->uservisible) { // Do not icnlude empty sections at all.
continue;
}
if ($mod->sectionnum >= 0 and $section != $mod->sectionnum) {
$thissection = $sections[$mod->sectionnum];
if ($thissection->visible or
(isset($courseformatoptions['hiddensections']) and !$courseformatoptions['hiddensections']) or
has_capability('moodle/course:viewhiddensections', $coursecontext)) {
$thissection->summary = strip_tags(format_string($thissection->summary, true));
if (!$doneheading) {
$menu[] = '</ul></li>';
}
if ($course->format == 'weeks' or empty($thissection->summary)) {
$item = $strsection ." ". $mod->sectionnum;
} else {
if (core_text::strlen($thissection->summary) < ($width-3)) {
$item = $thissection->summary;
} else {
$item = core_text::substr($thissection->summary, 0, $width).'...';
}
}
$menu[] = '<li class="section"><span>'.$item.'</span>';
$menu[] = '<ul>';
$doneheading = true;
$section = $mod->sectionnum;
} else {
// No activities from this hidden section shown.
continue;
}
}
$url = $mod->modname .'/view.php?id='. $mod->id;
$mod->name = strip_tags(format_string($mod->name ,true));
if (core_text::strlen($mod->name) > ($width+5)) {
$mod->name = core_text::substr($mod->name, 0, $width).'...';
}
if (!$mod->visible) {
$mod->name = '('.$mod->name.')';
}
$class = 'activity '.$mod->modname;
$class .= ($cmid == $mod->id) ? ' selected' : '';
$menu[] = '<li class="'.$class.'">'.
$OUTPUT->image_icon('monologo', '', $mod->modname).
'<a href="'.$CFG->wwwroot.'/mod/'.$url.'">'.$mod->name.'</a></li>';
}
if ($doneheading) {
$menu[] = '</ul></li>';
}
$menu[] = '</ul></li></ul>';
return implode("\n", $menu);
}
/**
* Print an error to STDOUT and exit with a non-zero code. For commandline scripts.
*
* Default errorcode is 1.
*
* Very useful for perl-like error-handling:
* do_somethting() or mdie("Something went wrong");
*
* @param string $msg Error message
* @param integer $errorcode Error code to emit
*/
function mdie($msg='', $errorcode=1) {
trigger_error($msg);
exit($errorcode);
}
/**
* Print a message and exit.
*
* @param string $message The message to print in the notice
* @param moodle_url|string $link The link to use for the continue button
* @param object $course A course object. Unused.
* @return void This function simply exits
*/
function notice ($message, $link='', $course=null) {
global $PAGE, $OUTPUT;
$message = clean_text($message); // In case nasties are in here.
if (CLI_SCRIPT) {
echo("!!$message!!\n");
exit(1); // No success.
}
if (!$PAGE->headerprinted) {
// Header not yet printed.
$PAGE->set_title(get_string('notice'));
echo $OUTPUT->header();
} else {
echo $OUTPUT->container_end_all(false);
}
echo $OUTPUT->box($message, 'generalbox', 'notice');
echo $OUTPUT->continue_button($link);
echo $OUTPUT->footer();
exit(1); // General error code.
}
/**
* Redirects the user to another page, after printing a notice.
*
* This function calls the OUTPUT redirect method, echo's the output and then dies to ensure nothing else happens.
*
* <strong>Good practice:</strong> You should call this method before starting page
* output by using any of the OUTPUT methods.
*
* @param moodle_url|string $url A moodle_url to redirect to. Strings are not to be trusted!
* @param string $message The message to display to the user
* @param int $delay The delay before redirecting
* @param string $messagetype The type of notification to show the message in. See constants on \core\output\notification.
* @throws moodle_exception
*/
function redirect($url, $message='', $delay=null, $messagetype = \core\output\notification::NOTIFY_INFO): Never {
global $OUTPUT, $PAGE, $CFG;
if (CLI_SCRIPT or AJAX_SCRIPT) {
// This is wrong - developers should not use redirect in these scripts but it should not be very likely.
throw new moodle_exception('redirecterrordetected', 'error');
}
if ($delay === null) {
$delay = -1;
}
// Prevent debug errors - make sure context is properly initialised.
if ($PAGE) {
$PAGE->set_context(null);
$PAGE->set_pagelayout('redirect'); // No header and footer needed.
$PAGE->set_title(get_string('pageshouldredirect', 'moodle'));
}
if ($url instanceof moodle_url) {
$url = $url->out(false);
}
$debugdisableredirect = false;
do {
if (defined('DEBUGGING_PRINTED')) {
// Some debugging already printed, no need to look more.
$debugdisableredirect = true;
break;
}
if (core_useragent::is_msword()) {
// Clicking a URL from MS Word sends a request to the server without cookies. If that
// causes a redirect Word will open a browser pointing the new URL. If not, the URL that
// was clicked is opened. Because the request from Word is without cookies, it almost
// always results in a redirect to the login page, even if the user is logged in in their
// browser. This is not what we want, so prevent the redirect for requests from Word.
$debugdisableredirect = true;
break;
}
if (empty($CFG->debugdisplay) or empty($CFG->debug)) {
// No errors should be displayed.
break;
}
if (!function_exists('error_get_last') or !$lasterror = error_get_last()) {
break;
}
if (!($lasterror['type'] & $CFG->debug)) {
// Last error not interesting.
break;
}
// Watch out here, @hidden() errors are returned from error_get_last() too.
if (headers_sent()) {
// We already started printing something - that means errors likely printed.
$debugdisableredirect = true;
break;
}
if (ob_get_level() and ob_get_contents()) {
// There is something waiting to be printed, hopefully it is the errors,
// but it might be some error hidden by @ too - such as the timezone mess from setup.php.
$debugdisableredirect = true;
break;
}
} while (false);
// Technically, HTTP/1.1 requires Location: header to contain the absolute path.
// (In practice browsers accept relative paths - but still, might as well do it properly.)
// This code turns relative into absolute.
if (!preg_match('|^[a-z]+:|i', $url)) {
// Get host name http://www.wherever.com.
$hostpart = preg_replace('|^(.*?[^:/])/.*$|', '$1', $CFG->wwwroot);
if (preg_match('|^/|', $url)) {
// URLs beginning with / are relative to web server root so we just add them in.
$url = $hostpart.$url;
} else {
// URLs not beginning with / are relative to path of current script, so add that on.
$url = $hostpart.preg_replace('|\?.*$|', '', me()).'/../'.$url;
}
// Replace all ..s.
while (true) {
$newurl = preg_replace('|/(?!\.\.)[^/]*/\.\./|', '/', $url);
if ($newurl == $url) {
break;
}
$url = $newurl;
}
}
// Sanitise url - we can not rely on moodle_url or our URL cleaning
// because they do not support all valid external URLs.
$url = preg_replace('/[\x00-\x1F\x7F]/', '', $url);
$url = str_replace('"', '%22', $url);
$encodedurl = preg_replace("/\&(?![a-zA-Z0-9#]{1,8};)/", "&", $url);
$encodedurl = preg_replace('/^.*href="([^"]*)".*$/', "\\1", clean_text('<a href="'.$encodedurl.'" />', FORMAT_HTML));
$url = str_replace('&', '&', $encodedurl);
if (!empty($message)) {
if (!$debugdisableredirect && !headers_sent()) {
// A message has been provided, and the headers have not yet been sent.
// Display the message as a notification on the subsequent page.
\core\notification::add($message, $messagetype);
$message = null;
$delay = 0;
} else {
if ($delay === -1 || !is_numeric($delay)) {
$delay = 3;
}
$message = clean_text($message);
}
} else {
$message = get_string('pageshouldredirect');
$delay = 0;
}
// Make sure the session is closed properly, this prevents problems in IIS
// and also some potential PHP shutdown issues.
\core\session\manager::write_close();
if ($delay == 0 && !$debugdisableredirect && !headers_sent()) {
// This helps when debugging redirect issues like loops and it is not clear
// which layer in the stack sent the redirect header. If debugging is on
// then the file and line is also shown.
$redirectby = 'Moodle';
if (debugging('', DEBUG_DEVELOPER)) {
$origin = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1)[0];
$redirectby .= ' /' . str_replace($CFG->dirroot . '/', '', $origin['file']) . ':' . $origin['line'];
}
@header("X-Redirect-By: $redirectby");
// 302 might not work for POST requests, 303 is ignored by obsolete clients.
@header($_SERVER['SERVER_PROTOCOL'] . ' 303 See Other');
@header('Location: '.$url);
echo bootstrap_renderer::plain_redirect_message($encodedurl);
exit;
}
// Include a redirect message, even with a HTTP redirect, because that is recommended practice.
if ($PAGE) {
$CFG->docroot = false; // To prevent the link to moodle docs from being displayed on redirect page.
echo $OUTPUT->redirect_message($encodedurl, $message, $delay, $debugdisableredirect, $messagetype);
exit;
} else {
echo bootstrap_renderer::early_redirect_message($encodedurl, $message, $delay);
exit;
}
}
/**
* Given an email address, this function will return an obfuscated version of it.
*
* @param string $email The email address to obfuscate
* @return string The obfuscated email address
*/
function obfuscate_email($email) {
$i = 0;
$length = strlen($email);
$obfuscated = '';
while ($i < $length) {
if (rand(0, 2) && $email[$i]!='@') { // MDL-20619 some browsers have problems unobfuscating @.
$obfuscated.='%'.dechex(ord($email[$i]));
} else {
$obfuscated.=$email[$i];
}
$i++;
}
return $obfuscated;
}
/**
* This function takes some text and replaces about half of the characters
* with HTML entity equivalents. Return string is obviously longer.
*
* @param string $plaintext The text to be obfuscated
* @return string The obfuscated text
*/
function obfuscate_text($plaintext) {
$i=0;
$length = core_text::strlen($plaintext);
$obfuscated='';
$prevobfuscated = false;
while ($i < $length) {
$char = core_text::substr($plaintext, $i, 1);
$ord = core_text::utf8ord($char);
$numerical = ($ord >= ord('0')) && ($ord <= ord('9'));
if ($prevobfuscated and $numerical ) {
$obfuscated.='&#'.$ord.';';
} else if (rand(0, 2)) {
$obfuscated.='&#'.$ord.';';
$prevobfuscated = true;
} else {
$obfuscated.=$char;
$prevobfuscated = false;
}
$i++;
}
return $obfuscated;
}
/**
* This function uses the {@link obfuscate_email()} and {@link obfuscate_text()}
* to generate a fully obfuscated email link, ready to use.
*
* @param string $email The email address to display
* @param string $label The text to displayed as hyperlink to $email
* @param boolean $dimmed If true then use css class 'dimmed' for hyperlink
* @param string $subject The subject of the email in the mailto link
* @param string $body The content of the email in the mailto link
* @return string The obfuscated mailto link
*/
function obfuscate_mailto($email, $label='', $dimmed=false, $subject = '', $body = '') {
if (empty($label)) {
$label = $email;
}
$label = obfuscate_text($label);
$email = obfuscate_email($email);
$mailto = obfuscate_text('mailto');
$url = new moodle_url("mailto:$email");
$attrs = array();
if (!empty($subject)) {
$url->param('subject', format_string($subject));
}
if (!empty($body)) {
$url->param('body', format_string($body));
}
// Use the obfuscated mailto.
$url = preg_replace('/^mailto/', $mailto, $url->out());
if ($dimmed) {
$attrs['title'] = get_string('emaildisable');
$attrs['class'] = 'dimmed';
}
return html_writer::link($url, $label, $attrs);
}
/**
* This function is used to rebuild the <nolink> tag because some formats (PLAIN and WIKI)
* will transform it to html entities
*
* @param string $text Text to search for nolink tag in
* @return string
*/
function rebuildnolinktag($text) {
$text = preg_replace('/<(\/*nolink)>/i', '<$1>', $text);
return $text;
}
/**
* Prints a maintenance message from $CFG->maintenance_message or default if empty.
*/
function print_maintenance_message() {
global $CFG, $SITE, $PAGE, $OUTPUT;
header($_SERVER['SERVER_PROTOCOL'] . ' 503 Moodle under maintenance');
header('Status: 503 Moodle under maintenance');
header('Retry-After: 300');
$PAGE->set_pagetype('maintenance-message');
$PAGE->set_pagelayout('maintenance');
$PAGE->set_heading($SITE->fullname);
echo $OUTPUT->header();
echo $OUTPUT->heading(get_string('sitemaintenance', 'admin'));
if (isset($CFG->maintenance_message) and !html_is_blank($CFG->maintenance_message)) {
echo $OUTPUT->box_start('maintenance_message generalbox boxwidthwide boxaligncenter');
echo $CFG->maintenance_message;
echo $OUTPUT->box_end();
}
echo $OUTPUT->footer();
die;
}
/**
* Returns a string containing a nested list, suitable for formatting into tabs with CSS.
*
* It is not recommended to use this function in Moodle 2.5 but it is left for backward
* compartibility.
*
* Example how to print a single line tabs:
* $rows = array(
* new tabobject(...),
* new tabobject(...)
* );
* echo $OUTPUT->tabtree($rows, $selectedid);
*
* Multiple row tabs may not look good on some devices but if you want to use them
* you can specify ->subtree for the active tabobject.
*
* @param array $tabrows An array of rows where each row is an array of tab objects
* @param string $selected The id of the selected tab (whatever row it's on)
* @param array $inactive An array of ids of inactive tabs that are not selectable.
* @param array $activated An array of ids of other tabs that are currently activated
* @param bool $return If true output is returned rather then echo'd
* @return string HTML output if $return was set to true.
*/
function print_tabs($tabrows, $selected = null, $inactive = null, $activated = null, $return = false) {
global $OUTPUT;
$tabrows = array_reverse($tabrows);
$subtree = array();
foreach ($tabrows as $row) {
$tree = array();
foreach ($row as $tab) {
$tab->inactive = is_array($inactive) && in_array((string)$tab->id, $inactive);
$tab->activated = is_array($activated) && in_array((string)$tab->id, $activated);
$tab->selected = (string)$tab->id == $selected;
if ($tab->activated || $tab->selected) {
$tab->subtree = $subtree;
}
$tree[] = $tab;
}
$subtree = $tree;
}
$output = $OUTPUT->tabtree($subtree);
if ($return) {
return $output;
} else {
print $output;
return !empty($output);
}
}
/**
* Alter debugging level for the current request,
* the change is not saved in database.
*
* @param int $level one of the DEBUG_* constants
* @param bool $debugdisplay
*/
function set_debugging($level, $debugdisplay = null) {
global $CFG;
$CFG->debug = (int)$level;
$CFG->debugdeveloper = (($CFG->debug & DEBUG_DEVELOPER) === DEBUG_DEVELOPER);
if ($debugdisplay !== null) {
$CFG->debugdisplay = (bool)$debugdisplay;
}
}
/**
* Standard Debugging Function
*
* Returns true if the current site debugging settings are equal or above specified level.
* If passed a parameter it will emit a debugging notice similar to trigger_error(). The
* routing of notices is controlled by $CFG->debugdisplay
* eg use like this:
*
* 1) debugging('a normal debug notice');
* 2) debugging('something really picky', DEBUG_ALL);
* 3) debugging('annoying debug message only for developers', DEBUG_DEVELOPER);
* 4) if (debugging()) { perform extra debugging operations (do not use print or echo) }
*
* In code blocks controlled by debugging() (such as example 4)
* any output should be routed via debugging() itself, or the lower-level
* trigger_error() or error_log(). Using echo or print will break XHTML
* JS and HTTP headers.
*
* It is also possible to define NO_DEBUG_DISPLAY which redirects the message to error_log.
*
* @param string $message a message to print
* @param int $level the level at which this debugging statement should show
* @param array $backtrace use different backtrace
* @return bool
*/
function debugging($message = '', $level = DEBUG_NORMAL, $backtrace = null) {
global $CFG, $USER;
$forcedebug = false;
if (!empty($CFG->debugusers) && $USER) {
$debugusers = explode(',', $CFG->debugusers);
$forcedebug = in_array($USER->id, $debugusers);
}
if (!$forcedebug and (empty($CFG->debug) || ($CFG->debug != -1 and $CFG->debug < $level))) {
return false;
}
if (!isset($CFG->debugdisplay)) {
$CFG->debugdisplay = ini_get_bool('display_errors');
}
if ($message) {
if (!$backtrace) {
$backtrace = debug_backtrace();
}
$from = format_backtrace($backtrace, CLI_SCRIPT || NO_DEBUG_DISPLAY);
if (PHPUNIT_TEST) {
if (phpunit_util::debugging_triggered($message, $level, $from)) {
// We are inside test, the debug message was logged.
return true;
}
}
if (NO_DEBUG_DISPLAY) {
// Script does not want any errors or debugging in output,
// we send the info to error log instead.
error_log('Debugging: ' . $message . ' in '. PHP_EOL . $from);
} else if ($forcedebug or $CFG->debugdisplay) {
if (!defined('DEBUGGING_PRINTED')) {
define('DEBUGGING_PRINTED', 1); // Indicates we have printed something.
}
if (CLI_SCRIPT) {
echo "++ $message ++\n$from";
} else {
if (property_exists($CFG, 'debug_developer_debugging_as_error')) {
$showaserror = $CFG->debug_developer_debugging_as_error;
} else {
$showaserror = (bool) get_whoops();
}
if ($showaserror) {
trigger_error($message, E_USER_NOTICE);
} else {
echo '<div class="notifytiny debuggingmessage" data-rel="debugging">', $message, $from, '</div>';
}
}
} else {
trigger_error($message . $from, E_USER_NOTICE);
}
}
return true;
}
/**
* Outputs a HTML comment to the browser.
*
* This is used for those hard-to-debug pages that use bits from many different files in very confusing ways (e.g. blocks).
*
* <code>print_location_comment(__FILE__, __LINE__);</code>
*
* @param string $file
* @param integer $line
* @param boolean $return Whether to return or print the comment
* @return string|void Void unless true given as third parameter
*/
function print_location_comment($file, $line, $return = false) {
if ($return) {
return "<!-- $file at line $line -->\n";
} else {
echo "<!-- $file at line $line -->\n";
}
}
/**
* Returns true if the user is using a right-to-left language.
*
* @return boolean true if the current language is right-to-left (Hebrew, Arabic etc)
*/
function right_to_left() {
return (get_string('thisdirection', 'langconfig') === 'rtl');
}
/**
* Returns swapped left<=> right if in RTL environment.
*
* Part of RTL Moodles support.
*
* @param string $align align to check
* @return string
*/
function fix_align_rtl($align) {
if (!right_to_left()) {
return $align;
}
if ($align == 'left') {
return 'right';
}
if ($align == 'right') {
return 'left';
}
return $align;
}
/**
* Returns true if the page is displayed in a popup window.
*
* Gets the information from the URL parameter inpopup.
*
* @todo Use a central function to create the popup calls all over Moodle and
* In the moment only works with resources and probably questions.
*
* @return boolean
*/
function is_in_popup() {
$inpopup = optional_param('inpopup', '', PARAM_BOOL);
return ($inpopup);
}
/**
* Returns a localized sentence in the current language summarizing the current password policy
*
* @todo this should be handled by a function/method in the language pack library once we have a support for it
* @uses $CFG
* @return string
*/
function print_password_policy() {
global $CFG;
$message = '';
if (!empty($CFG->passwordpolicy)) {
$messages = array();
if (!empty($CFG->minpasswordlength)) {
$messages[] = get_string('informminpasswordlength', 'auth', $CFG->minpasswordlength);
}
if (!empty($CFG->minpassworddigits)) {
$messages[] = get_string('informminpassworddigits', 'auth', $CFG->minpassworddigits);
}
if (!empty($CFG->minpasswordlower)) {
$messages[] = get_string('informminpasswordlower', 'auth', $CFG->minpasswordlower);
}
if (!empty($CFG->minpasswordupper)) {
$messages[] = get_string('informminpasswordupper', 'auth', $CFG->minpasswordupper);
}
if (!empty($CFG->minpasswordnonalphanum)) {
$messages[] = get_string('informminpasswordnonalphanum', 'auth', $CFG->minpasswordnonalphanum);
}
// Fire any additional password policy functions from plugins.
// Callbacks must return an array of message strings.
$pluginsfunction = get_plugins_with_function('print_password_policy');
foreach ($pluginsfunction as $plugintype => $plugins) {
foreach ($plugins as $pluginfunction) {
$messages = array_merge($messages, $pluginfunction());
}
}
$messages = join(', ', $messages); // This is ugly but we do not have anything better yet...
// Check if messages is empty before outputting any text.
if ($messages != '') {
$message = get_string('informpasswordpolicy', 'auth', $messages);
}
}
return $message;
}
/**
* Get the value of a help string fully prepared for display in the current language.
*
* @param string $identifier The identifier of the string to search for.
* @param string $component The module the string is associated with.
* @param boolean $ajax Whether this help is called from an AJAX script.
* This is used to influence text formatting and determines
* which format to output the doclink in.
* @param string|object|array $a An object, string or number that can be used
* within translation strings
* @return stdClass An object containing:
* - heading: Any heading that there may be for this help string.
* - text: The wiki-formatted help string.
* - doclink: An object containing a link, the linktext, and any additional
* CSS classes to apply to that link. Only present if $ajax = false.
* - completedoclink: A text representation of the doclink. Only present if $ajax = true.
*/
function get_formatted_help_string($identifier, $component, $ajax = false, $a = null) {
global $CFG, $OUTPUT;
$sm = get_string_manager();
// Do not rebuild caches here!
// Devs need to learn to purge all caches after any change or disable $CFG->langstringcache.
$data = new stdClass();
if ($sm->string_exists($identifier, $component)) {
$data->heading = format_string(get_string($identifier, $component));
} else {
// Gracefully fall back to an empty string.
$data->heading = '';
}
if ($sm->string_exists($identifier . '_help', $component)) {
$options = new stdClass();
$options->trusted = false;
$options->noclean = false;
$options->filter = false;
$options->para = true;
$options->newlines = false;
$options->overflowdiv = !$ajax;
// Should be simple wiki only MDL-21695.
$data->text = format_text(get_string($identifier.'_help', $component, $a), FORMAT_MARKDOWN, $options);
$helplink = $identifier . '_link';
if ($sm->string_exists($helplink, $component)) { // Link to further info in Moodle docs.
$link = get_string($helplink, $component);
$linktext = get_string('morehelp');
$data->doclink = new stdClass();
$url = new moodle_url(get_docs_url($link));
if ($ajax) {
$data->doclink->link = $url->out();
$data->doclink->linktext = $linktext;
$data->doclink->class = ($CFG->doctonewwindow) ? 'helplinkpopup' : '';
} else {
$data->completedoclink = html_writer::tag('div', $OUTPUT->doc_link($link, $linktext),
array('class' => 'helpdoclink'));
}
}
} else {
$data->text = html_writer::tag('p',
html_writer::tag('strong', 'TODO') . ": missing help string [{$identifier}_help, {$component}]");
}
return $data;
}