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<?php
/*
* Textpattern Content Management System
* https://textpattern.com/
*
* Copyright (C) 2026 The Textpattern Development Team
*
* This file is part of Textpattern.
*
* Textpattern 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, version 2.
*
* Textpattern 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 Textpattern. If not, see <https://www.gnu.org/licenses/>.
*/
/**
* Collection of miscellaneous tools.
*
* @package Misc
*/
/**
* Strips NULL bytes.
*
* @param string|array $in The input value
* @return mixed
*/
function deNull($in)
{
return is_array($in) ? doArray($in, 'deNull') : strtr((string)$in, array("\0" => ''));
}
/**
* Strips carriage returns and linefeeds.
*
* @param string|array $in The input value
* @return mixed
*/
function deCRLF($in)
{
return is_array($in) ? doArray($in, 'deCRLF') : strtr((string)$in, array(
"\n" => '',
"\r" => '',
));
}
/**
* Applies a callback to a given string or an array.
*
* @param string|array $in An array or a string to run through the callback function
* @param callback $function The callback function
* @return mixed
* @example
* echo doArray(array('value1', 'value2'), 'intval');
*/
function doArray($in, $function)
{
if (is_array($in)) {
return array_map($function, $in);
}
if (is_array($function)) {
return call_user_func($function, $in);
}
return $function($in);
}
/**
* Un-quotes a quoted string or an array of values.
*
* @param string|array $in The input value
* @return mixed
*/
function doStrip($in)
{
return is_array($in) ? doArray($in, 'doStrip') : doArray($in, 'stripslashes');
}
/**
* Strips HTML and PHP tags from a string or an array.
*
* @param string|array $in The input value
* @return mixed
* @example
* echo doStripTags('<p>Hello world!</p>');
*/
function doStripTags($in)
{
return is_array($in) ? doArray($in, 'doStripTags') : doArray($in, 'strip_tags');
}
/**
* Converts entity escaped brackets back to characters.
*
* @param string|array $in The input value
* @return mixed
*/
function doDeEnt($in)
{
return doArray($in, 'deEntBrackets');
}
/**
* Converts entity escaped brackets back to characters.
*
* @param string $in The input value
* @return string
*/
function deEntBrackets($in)
{
$array = array(
'<' => '<',
'<' => '<',
'<' => '<',
'>' => '>',
'>' => '>',
'>' => '>',
);
foreach ($array as $k => $v) {
$in = preg_replace("/".preg_quote($k)."/i", $v, $in);
}
return $in;
}
/**
* Escapes special characters for use in an SQL statement.
*
* Always use this function when dealing with user-defined values in SQL
* statements. If this function is not used to escape user-defined data in a
* statement, the query is vulnerable to SQL injection attacks.
*
* @param string|array $in The input value
* @return mixed An array of escaped values or a string depending on $in
* @package DB
* @example
* echo safe_field('column', 'table', "color = '" . doSlash(gps('color')) . "'");
*/
function doSlash($in)
{
return doArray($in, 'safe_escape');
}
/**
* Escape SQL LIKE pattern's wildcards for use in an SQL statement.
*
* @param string|array $in The input value
* @return mixed An array of escaped values or a string depending on $in
* @since 4.6.0
* @package DB
* @example
* echo safe_field('column', 'table', "color LIKE '" . doLike(gps('color')) . "'");
*/
function doLike($in)
{
return doArray($in, 'safe_escape_like');
}
/**
* A shell for htmlspecialchars() with $flags defaulting to ENT_QUOTES.
*
* @param string $string The string being converted
* @param int $flags A bitmask of one or more flags. The default is ENT_QUOTES
* @param string $encoding Defines encoding used in conversion. The default is UTF-8
* @param bool $double_encode When double_encode is turned off PHP will not encode existing HTML entities, the default is to convert everything
* @return string
* @see https://www.php.net/manual/en/function.htmlspecialchars.php
* @since 4.5.0
* @package Filter
*/
function txpspecialchars($string, $flags = ENT_QUOTES, $encoding = 'UTF-8', $double_encode = true)
{
// Ignore ENT_HTML5 and ENT_XHTML for now.
// ENT_HTML5 and ENT_XHTML are defined in PHP 5.4+ but we consistently encode single quotes as ' in any doctype.
// global $prefs;
// static $h5 = null;
//
// if (defined(ENT_HTML5)) {
// if ($h5 === null) {
// $h5 = ($prefs['doctype'] == 'html5' && TXPINTERFACE == 'public');
// }
//
// if ($h5) {
// $flags = ($flags | ENT_HTML5) & ~ENT_HTML401;
// }
// }
//
return htmlspecialchars((string)$string, $flags, $encoding, $double_encode);
}
/**
* Converts special characters to HTML entities.
*
* @param array|string $in The input value
* @return mixed The array or string with HTML syntax characters escaped
* @package Filter
*/
function doSpecial($in)
{
return doArray($in, 'txpspecialchars');
}
/**
* Converts the given value to NULL.
*
* @param mixed $a The input value
* @return null
* @package Filter
* @access private
*/
function _null($a)
{
return null;
}
/**
* Converts an array of values to NULL.
*
* @param array $in The array
* @return array
* @package Filter
*/
function array_null($in)
{
return array_map('_null', $in);
}
/**
* Escapes a page title. Converts <, >, ', " characters to HTML entities.
*
* @param string $title The input string
* @return string The string escaped
* @package Filter
*/
function escape_title($title)
{
return strtr((string)$title, array(
'<' => '<',
'>' => '>',
"'" => ''',
'"' => '"',
));
}
/**
* Sanitises a string for use in a JavaScript string.
*
* Escapes \, \n, \r, " and ' characters. It removes 'PARAGRAPH SEPARATOR'
* (U+2029) and 'LINE SEPARATOR' (U+2028). When you need to pass a string
* from PHP to JavaScript, use this function to sanitise the value to avoid
* XSS attempts.
*
* @param string $js JavaScript input
* @return string Escaped JavaScript
* @since 4.4.0
* @package Filter
*/
function escape_js($js)
{
$js = isset($js) ? preg_replace('/[\x{2028}\x{2029}]/u', '', $js) : '';
return addcslashes($js, "\\\'\"\n\r");
}
/**
* Escapes CDATA section for an XML document.
*
* @param string $str The string
* @return string XML representation wrapped in CDATA tags
* @package XML
*/
function escape_cdata($str)
{
return '<![CDATA['.str_replace(']]>', ']]]><![CDATA[]>', $str).']]>';
}
/**
* Returns a localisation string.
*
* @param string $var String name
* @param array $atts Replacement pairs
* @param string $escape Convert special characters to HTML entities. Either "html" or ""
* @return string A localisation string
* @package L10n
*/
function gTxt($var, $atts = array(), $escape = 'html')
{
global $event, $plugin, $txp_current_plugin;
static $txpLang = null;
if ($txpLang === null) {
$txpLang = Txp::get('\Textpattern\L10n\Lang');
$lang = TXPINTERFACE == 'admin' ? get_pref('language_ui', gps('lang', LANG)) : LANG;
$loaded = $txpLang->load($lang, true);
$evt = isset($event) ? trim($event) : '';
if (empty($loaded) || !in_array($evt, $loaded)) {
load_lang($lang, $evt);
}
}
// Hackish
if (isset($txp_current_plugin) && isset($plugin['textpack'])) {
$txpLang->loadTextpack($plugin['textpack']);
unset($plugin['textpack']);
}
return $txpLang->txt($var, $atts, $escape);
}
/**
* Returns given timestamp in a format of 01 Jan 2001 15:19:16.
*
* @param int $timestamp The UNIX timestamp
* @return string A formatted date
* @access private
* @see safe_stftime()
* @package DateTime
* @example
* echo gTime();
*/
function gTime($timestamp = 0)
{
return safe_strftime('%d %b %Y %X', $timestamp);
}
/**
* Creates a dumpfile from a backtrace and outputs given parameters.
*
* @package Debug
*/
function dmp()
{
static $f = false;
if (defined('txpdmpfile')) {
global $prefs;
if (!$f) {
$f = fopen($prefs['tempdir'].DS.txpdmpfile, 'a');
}
$stack = get_caller();
fwrite($f, "\n[".$stack[0].t.safe_strftime('iso8601')."]\n");
}
$a = func_get_args();
if (!$f) {
echo "<pre dir=\"auto\">".n;
}
foreach ($a as $thing) {
$out = is_scalar($thing) ? strval($thing) : var_export($thing, true);
if ($f) {
fwrite($f, $out.n);
} else {
echo txpspecialchars($out).n;
}
}
if (!$f) {
echo "</pre>".n;
}
}
/**
* Gets the given language's strings from the database.
*
* Fetches the given language from the database and returns the strings
* as an array.
*
* If no $events is specified, only appropriate strings for the current context
* are returned. If 'TXPINTERFACE' constant equals 'admin' all strings are
* returned. Otherwise, only strings from events 'common' and 'public'.
*
* If $events is FALSE, returns all strings.
*
* @param string $lang The language code
* @param array|string|bool $events An array of loaded events
* @return array
* @package L10n
* @example
* print_r(
* load_lang('en-gb', false)
* );
*/
function load_lang($lang, $events = null)
{
global $production_status, $event, $textarray;
isset($textarray) or $textarray = array();
$textarray = array_merge($textarray, Txp::get('\Textpattern\L10n\Lang')->load($lang, $events));
if (($production_status !== 'live' || $event === 'diag')
&& $debug = parse_ini_file(txpath.DS.'mode.ini')
) {
$textarray += (array)$debug;
Txp::get('\Textpattern\L10n\Lang')->setPack($textarray);
}
return $textarray;
}
/**
* Gets a list of user groups.
*
* @param bool $keys Whether to fetch the array as keys (true) or gTxt() strings (false)
* @return array
* @package User
* @example
* print_r(
* get_groups()
* );
*/
function get_groups($keys = false)
{
global $txp_groups;
callback_event_ref('user', 'groups', 0, $txp_groups);
return $keys ? $txp_groups : doArray($txp_groups, 'gTxt');
}
/**
* Checks if a user has privileges to the given resource.
*
* @param string $res The resource
* @param mixed $user The user. If no user name is supplied, assume the current logged in user
* @return bool
* @package User
* @example
* add_privs('my_privilege_resource', '1,2,3');
* if (has_privs('my_privilege_resource', 'username'))
* {
* echo "'username' has privileges to 'my_privilege_resource'.";
* }
*/
function has_privs($res = null, $user = '')
{
global $txp_user, $txp_permissions;
static $privs;
if (is_array($user)) {
$level = isset($user['privs']) ? $user['privs'] : null;
$user = isset($user['name']) ? $user['name'] : '';
}
$user = (string) $user;
if ($user === '') {
$user = (string) $txp_user;
}
if ($user !== '') {
if (!isset($privs[$user])) {
$privs[$user] = isset($level) ?
$level :
safe_field("privs", 'txp_users', "name = '".doSlash($user)."'");
}
if (!isset($res)) {
return $privs[$user];
} elseif (isset($txp_permissions[$res]) && $privs[$user] && $txp_permissions[$res]) {
return in_list($privs[$user], $txp_permissions[$res]);
}
}
return false;
}
/**
* Adds dynamic privileges.
*
* @param array $pluggable The array, see global $txp_options
* @since 4.7.2
* @package User
*/
function plug_privs($pluggable = null, $user = null)
{
global $txp_options;
isset($pluggable) or $pluggable = $txp_options;
$level = isset($user['privs']) ? $user['privs'] : has_privs();
foreach ((array)$pluggable as $pref => $pane) {
if (is_array($pane)) {
if (isset($pane[0])) {
if (!in_list($level, $pane[0])) {
break;
}
unset($pane[0]);
}
} else {
$pane = array('prefs.'.$pref => $pane);
}
if (get_pref($pref)) {
array_walk($pane, function (&$item) use ($level) {
if ($item === true) {
$item = $level;
}
});
add_privs($pane);
} else {
add_privs(array_fill_keys(array_keys($pane), null));
}
}
}
/**
* Grants privileges to user-groups.
*
* Will not let you override existing privs.
*
* @param mixed $res The resource
* @param string $perm List of user-groups, e.g. '1,2,3'
* @package User
* @example
* add_privs('my_admin_side_panel_event', '1,2,3,4,5');
*/
function add_privs($res, $perm = '1')
{
global $txp_permissions;
if (!is_array($res)) {
$res = array($res => $perm);
}
foreach ($res as $priv => $group) {
if ($group === null) {
$txp_permissions[$priv] = null;
} else {
$group .= (empty($txp_permissions[$priv]) ? '' : ','.$txp_permissions[$priv]);
$group = join(',', do_list_unique($group));
$txp_permissions[$priv] = $group;
}
}
}
/**
* Require privileges from a user to the given resource.
*
* Terminates the script if user doesn't have required privileges.
*
* @param string|null $res The resource, or NULL
* @param string $user The user. If no user name is supplied, assume the current logged in user
* @package User
* @example
* require_privs('article.edit');
*/
function require_privs($res = null, $user = '')
{
if ($res === null || !has_privs($res, $user)) {
pagetop(gTxt('restricted_area'));
echo graf(gTxt('restricted_area'), array('class' => 'restricted-area'));
end_page();
exit;
}
}
/**
* Gets a list of users having access to a resource.
*
* @param string $res The resource, e.g. 'article.edit.published'
* @return array A list of usernames
* @since 4.5.0
* @package User
*/
function the_privileged($res, $real = false)
{
global $txp_permissions;
$out = array();
if (isset($txp_permissions[$res])) {
foreach (safe_rows("name, RealName", 'txp_users', "FIND_IN_SET(privs, '".$txp_permissions[$res]."') ORDER BY ".($real ? "RealName" : "name")." ASC") as $user) {
extract($user);
$out[$name] = $real ? $RealName : $name;
}
}
return $out;
}
/**
* Check whether a user can modify the article.
*
* Probably more suitable for Validator class?
*
* @param array $rs The article data
* @param string $user The user name
* @return bool
* @since 4.9.0
* @package User
*/
function can_modify($rs, $user = null) {
global $txp_user;
isset($user) or $user = $txp_user;
$published = $rs['Status'] >= STATUS_LIVE ? '.published' : '';
return has_privs('article.edit'.$published, $user) ||
$rs['AuthorID'] === $user && has_privs('article.edit.own'.$published, $user);
}
/**
* Check whether a user can preview the article.
*
* @param array $rs The article data
* @param string $user The user name
* @return bool
* @since 4.9.1
* @package User
*/
function can_preview($rs, $user = null) {
return has_privs('article.preview', $user) &&
(empty($rs['ID']) || can_modify($rs, $user));
}
/**
* Convert SVG size to pixel size
*
* @param char SVG size
* @return int size in px
* @package Image
*/
function txpsvgtopx($svgsize)
{
if (empty($svgsize)) {
return($svgsize);
}
preg_match('/([0-9\.]*)([A-Za-z]*)/', $svgsize, $matches);
switch (substr($matches[2], 0, 2)) {
case '':
return($matches[1]);
break;
case 'pt':
return($matches[1] * 96 / 72);
break;
case 'pc':
return($matches[1] * 16);
break;
case 'mm':
return($matches[1] * 96 / 25.4);
break;
case 'cm':
return($matches[1] * 96 / 2.54);
break;
case 'in':
return($matches[1] * 96);
break;
default:
return($matches[1]);
break;
}
}
/**
* Lists image types that can be safely uploaded.
*
* Returns different results based on the logged in user's privileges.
*
* @param int $type If set, validates the given value
* @return mixed
* @package Image
* @since 4.6.0
* @example
* list($width, $height, $extension) = getimagesize('image');
* if ($type = get_safe_image_types($extension))
* {
* echo "Valid image of {$type}.";
* }
*/
function get_safe_image_types($type = null)
{
$extensions = array(IMAGETYPE_GIF => '.gif', 0 => '.jpeg', IMAGETYPE_JPEG => '.jpg', IMAGETYPE_PNG => '.png') +
(has_privs('image.create.trusted') ? array(IMAGETYPE_SVG => '.svg') : array()) +
(defined('IMAGETYPE_WEBP') ? array(IMAGETYPE_WEBP => '.webp') : array()) +
(defined('IMAGETYPE_AVIF') ? array(IMAGETYPE_AVIF => '.avif') : array());
callback_event_ref('txp.image', 'types', 0, $extensions);
if (isset($type)) {
return !empty($extensions[$type]) ? $extensions[$type] : false;
}
return $extensions;
}
/**
* Gets the dimensions of an image for a HTML <img> tag.
*
* @param string $name The filename
* @return string|bool height="100" width="40", or FALSE on failure
* @package Image
* @example
* if ($size = sizeImage('/path/to/image.png'))
* {
* echo "<img src='image.png' {$size} />";
* }
*/
function sizeImage($name)
{
$size = getimagesize($name);
return is_array($size) ? $size[3] : false;
}
/**
* Gets an image as an array.
*
* @param int $id image ID
* @param string $name image name
* @return array|bool An image data array, or FALSE on failure
* @package Image
* @example
* if ($image = imageFetchInfo($id))
* {
* print_r($image);
* }
*/
function imageFetchInfo($id = "", $name = "")
{
global $thisimage, $p;
static $cache = array(), $fields = null;
if ($id) {
if (isset($cache['i'][$id])) {
return $cache['i'][$id];
} elseif (preg_match('/^\d+$/', trim($id))) {
$where = 'id = '.intval($id).' LIMIT 1';
} else {
// $id might be a direct URL.
if (!isset($fields)) {
$fields = array(
'id' => NULL,
'name' => '',
'category' => '',
'ext' => '',
'w' => 0,
'h' => 0,
'alt' => '',
'caption' => NULL,
'date' => NULL,
'author' => '',
'thumbnail' => 0,
'thumb_w' => 0,
'thumb_h' => 0,
);
// $fields = array_column(safe_show('columns', 'txp_image'), 'Default', 'Field');
$fields['date'] = date('c');
}
$pathinfo = pathinfo($id);
$fields['name'] = isset($pathinfo['filename']) ? $pathinfo['filename'] : '';
$fields['ext'] = isset($pathinfo['extension']) ? '.'.$pathinfo['extension'] : '';
$fields['id'] = $id;
return $fields;
}
} elseif ($name) {
if (isset($cache['n'][$name])) {
return $cache['n'][$name];
} else {
$where = "name = '".doSlash($name)."' LIMIT 1";
}
} elseif ($thisimage) {
$id = (int) $thisimage['id'];
return $cache['i'][$id] = $thisimage;
} elseif ($p) {
if (isset($cache['i'][$p])) {
return $cache['i'][$p];
} else {
$where = 'id = '.intval($p).' LIMIT 1';
}
} else {
assert_image();
return false;
}
$rs = safe_row("*", 'txp_image', $where);
if ($rs) {
$id = (int) $rs['id'];
return $cache['i'][$id] = image_format_info($rs);
} else {
trigger_error(gTxt('unknown_image'));
}
return false;
}
/**
* Private implementation of PHP image_type_to_mime_type().
*
* Takes an image data array generated by imageFetchInfo() and formats the contents.
*
* @param integer $image_type IMAGETYPE_XXX
* @return string
* @access private
* @package Image
*/
function txp_image_type_to_mime_type($image_type)
{
if ($image_type == IMAGETYPE_SVG) {
return 'image/svg+xml';
}
return image_type_to_mime_type($image_type);
}
/**
* Formats image info.
*
* Takes an image data array generated by imageFetchInfo() and formats the contents.
*
* @param array $image The image
* @return array
* @see imageFetchInfo()
* @access private
* @package Image
*/
function image_format_info($image)
{
global $txpnow;
static $mimetypes;
if (($unix_ts = strtotime($image['date'])) !== false) {
$image['date'] = $unix_ts;
}
if (!isset($mimetypes)) {
$mimetypes = get_safe_image_types();
}
$image['mime'] = ($mime = array_search($image['ext'], $mimetypes)) !== false ? txp_image_type_to_mime_type($mime) : '';
$image['aspect'] = $image['w'] == $image['h'] ? 'square' : ($image['w'] > $image['h'] ? 'landscape' : 'portrait');
/*
$cfs = Txp::get('\Textpattern\Meta\FieldSet', 2)
->filterCollectionAt($unix_ts ? $unix_ts : $txpnow);
foreach ($cfs as $cf) {
$table_id = Txp::get('\Textpattern\Meta\ContentType')->getEntityTable($meta_type);
$ref = $image['id'] ? array($image['id'], 2) : null;
$cf->loadContent($ref, true);
$valueField = $cf->getValueField();
$contentSet = $cf->getContent();
$vals = array();
foreach ($contentSet as $contentRow) {
$vals[] = is_array($contentRow) ? $contentRow[$valueField] : $contentRow;
}
$image[$cf->get('name')] = implode((string)$cf->get('delimiter'), $vals);
}
*/
return $image;
}
/**
* Formats link info.
*
* @param array $link The link to format
* @return array Formatted link data
* @access private
* @package Link
*/
function link_format_info($link)
{
if (($unix_ts = strtotime($link['date'])) > 0) {
$link['date'] = $unix_ts;
}
return $link;
}
/**
* Gets a HTTP GET or POST parameter.
*
* Internally strips CRLF from GET parameters and removes NULL bytes.
*
* @param string $thing The parameter to get
* @return string|array The value of $thing, or an empty string
* @package Network
* @example
* if (gps('sky') == 'blue' && gps('roses') == 'red')
* {
* echo 'Roses are red, sky is blue.';
* }
*/
function gps($thing, $default = '')
{
global $pretext;
if (isset($_GET[$thing])) {
$out = $_GET[$thing];
$out = doArray($out, 'deCRLF');
} elseif (isset($_POST[$thing])) {
$out = $_POST[$thing];
} elseif (is_numeric($thing) && isset($pretext[abs($thing)])) {
$thing >= 0 or $thing += $pretext[0] + 1;
$out = $pretext[$thing];
} else {
return $default;
}
$out = doArray($out, 'deNull');
return $out;
}
/**
* Gets an array of HTTP GET or POST parameters.
*
* @param array $array The parameters to extract
* @return array
* @package Network
* @example
* extract(gpsa(array('sky', 'roses'));
* if ($sky == 'blue' && $roses == 'red')
* {
* echo 'Roses are red, sky is blue.';
* }
*/
function gpsa($array)
{
if (is_array($array)) {
$out = array();
foreach ($array as $a) {
$out[$a] = gps($a);
}
return $out;
}
return false;
}
/**
* Gets a HTTP POST parameter.
*
* Internally removes NULL bytes.
*