397 lines
12 KiB
PHP
397 lines
12 KiB
PHP
<?php
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/**
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* @file src/Util/Strings.php
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*/
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namespace Friendica\Util;
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use Friendica\Content\ContactSelector;
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use Friendica\Core\Logger;
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/**
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* @brief This class handles string functions
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*/
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class Strings
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{
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/**
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* @brief Generates a pseudo-random string of hexadecimal characters
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*
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* @param int $size
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* @return string
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*/
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public static function getRandomHex($size = 64)
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{
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$byte_size = ceil($size / 2);
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$bytes = random_bytes($byte_size);
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$return = substr(bin2hex($bytes), 0, $size);
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return $return;
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}
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/**
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* This is our primary input filter.
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*
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* The high bit hack only involved some old IE browser, forget which (IE5/Mac?)
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* that had an XSS attack vector due to stripping the high-bit on an 8-bit character
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* after cleansing, and angle chars with the high bit set could get through as markup.
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*
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* This is now disabled because it was interfering with some legitimate unicode sequences
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* and hopefully there aren't a lot of those browsers left.
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*
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* Use this on any text input where angle chars are not valid or permitted
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* They will be replaced with safer brackets. This may be filtered further
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* if these are not allowed either.
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*
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* @param string $string Input string
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* @return string Filtered string
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*/
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public static function removeTags($string)
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{
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return str_replace(["<", ">"], ['[', ']'], $string);
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}
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/**
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* @brief Use this on "body" or "content" input where angle chars shouldn't be removed,
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* and allow them to be safely displayed.
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* @param string $string
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*
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* @return string
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*/
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public static function escapeTags($string)
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{
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return htmlspecialchars($string, ENT_COMPAT, 'UTF-8', false);
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}
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/**
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* @brief Generate a string that's random, but usually pronounceable. Used to generate initial passwords
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*
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* @param int $len length
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*
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* @return string
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*/
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public static function getRandomName($len)
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{
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if ($len <= 0) {
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return '';
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}
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$vowels = ['a', 'a', 'ai', 'au', 'e', 'e', 'e', 'ee', 'ea', 'i', 'ie', 'o', 'ou', 'u'];
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if (mt_rand(0, 5) == 4) {
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$vowels[] = 'y';
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}
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$cons = [
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'b', 'bl', 'br',
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'c', 'ch', 'cl', 'cr',
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'd', 'dr',
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'f', 'fl', 'fr',
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'g', 'gh', 'gl', 'gr',
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'h',
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'j',
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'k', 'kh', 'kl', 'kr',
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'l',
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'm',
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'n',
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'p', 'ph', 'pl', 'pr',
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'qu',
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'r', 'rh',
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's' ,'sc', 'sh', 'sm', 'sp', 'st',
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't', 'th', 'tr',
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'v',
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'w', 'wh',
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'x',
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'z', 'zh'
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];
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$midcons = ['ck', 'ct', 'gn', 'ld', 'lf', 'lm', 'lt', 'mb', 'mm', 'mn', 'mp',
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'nd', 'ng', 'nk', 'nt', 'rn', 'rp', 'rt'];
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$noend = ['bl', 'br', 'cl', 'cr', 'dr', 'fl', 'fr', 'gl', 'gr',
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'kh', 'kl', 'kr', 'mn', 'pl', 'pr', 'rh', 'tr', 'qu', 'wh', 'q'];
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$start = mt_rand(0, 2);
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if ($start == 0) {
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$table = $vowels;
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} else {
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$table = $cons;
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}
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$word = '';
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for ($x = 0; $x < $len; $x ++) {
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$r = mt_rand(0, count($table) - 1);
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$word .= $table[$r];
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if ($table == $vowels) {
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$table = array_merge($cons, $midcons);
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} else {
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$table = $vowels;
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}
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}
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$word = substr($word, 0, $len);
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foreach ($noend as $noe) {
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$noelen = strlen($noe);
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if ((strlen($word) > $noelen) && (substr($word, -$noelen) == $noe)) {
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$word = self::getRandomName($len);
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break;
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}
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}
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return $word;
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}
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/**
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* @brief translate and format the networkname of a contact
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*
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* @param string $network Networkname of the contact (e.g. dfrn, rss and so on)
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* @param string $url The contact url
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*
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* @return string Formatted network name
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*/
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public static function formatNetworkName($network, $url = 0)
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{
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if ($network != "") {
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if ($url != "") {
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$network_name = '<a href="'.$url.'">'.ContactSelector::networkToName($network, $url)."</a>";
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} else {
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$network_name = ContactSelector::networkToName($network);
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}
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return $network_name;
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}
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}
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/**
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* @brief Remove intentation from a text
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*
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* @param string $text String to be transformed.
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* @param string $chr Optional. Indentation tag. Default tab (\t).
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* @param int $count Optional. Default null.
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*
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* @return string Transformed string.
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*/
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public static function deindent($text, $chr = "[\t ]", $count = NULL)
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{
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$lines = explode("\n", $text);
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if (is_null($count)) {
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$m = [];
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$k = 0;
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while ($k < count($lines) && strlen($lines[$k]) == 0) {
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$k++;
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}
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preg_match("|^" . $chr . "*|", $lines[$k], $m);
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$count = strlen($m[0]);
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}
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for ($k = 0; $k < count($lines); $k++) {
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$lines[$k] = preg_replace("|^" . $chr . "{" . $count . "}|", "", $lines[$k]);
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}
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return implode("\n", $lines);
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}
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/**
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* @brief Get byte size returned in a Data Measurement (KB, MB, GB)
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*
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* @param int $bytes The number of bytes to be measured
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* @param int $precision Optional. Default 2.
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*
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* @return string Size with measured units.
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*/
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public static function formatBytes($bytes, $precision = 2)
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{
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$units = ['B', 'KB', 'MB', 'GB', 'TB'];
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$bytes = max($bytes, 0);
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$pow = floor(($bytes ? log($bytes) : 0) / log(1024));
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$pow = min($pow, count($units) - 1);
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$bytes /= pow(1024, $pow);
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return round($bytes, $precision) . ' ' . $units[$pow];
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}
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/**
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* @brief Protect percent characters in sprintf calls
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*
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* @param string $s String to transform.
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*
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* @return string Transformed string.
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*/
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public static function protectSprintf($s)
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{
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return str_replace('%', '%%', $s);
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}
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/**
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* @brief Base64 Encode URL and translate +/ to -_ Optionally strip padding.
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*
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* @param string $s URL to encode
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* @param boolean $strip_padding Optional. Default false
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*
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* @return string Encoded URL
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*/
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public static function base64UrlEncode($s, $strip_padding = false)
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{
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$s = strtr(base64_encode($s), '+/', '-_');
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if ($strip_padding) {
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$s = str_replace('=', '', $s);
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}
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return $s;
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}
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/**
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* @brief Decode Base64 Encoded URL and translate -_ to +/
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* @param string $s URL to decode
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*
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* @return string Decoded URL
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*/
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public static function base64UrlDecode($s)
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{
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if (is_array($s)) {
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Logger::log('base64url_decode: illegal input: ' . print_r(debug_backtrace(), true));
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return $s;
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}
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/*
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* // Placeholder for new rev of salmon which strips base64 padding.
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* // PHP base64_decode handles the un-padded input without requiring this step
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* // Uncomment if you find you need it.
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*
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* $l = strlen($s);
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* if (!strpos($s,'=')) {
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* $m = $l % 4;
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* if ($m == 2)
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* $s .= '==';
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* if ($m == 3)
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* $s .= '=';
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* }
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*
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*/
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return base64_decode(strtr($s, '-_', '+/'));
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}
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/**
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* @brief Pull out all #hashtags and @person tags from $string.
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*
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* We also get @person@domain.com - which would make
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* the regex quite complicated as tags can also
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* end a sentence. So we'll run through our results
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* and strip the period from any tags which end with one.
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* Returns array of tags found, or empty array.
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*
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* @param string $string Post content
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*
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* @return array List of tag and person names
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*/
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public static function getTags($string)
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{
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$ret = [];
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// Convert hashtag links to hashtags
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$string = preg_replace('/#\[url\=([^\[\]]*)\](.*?)\[\/url\]/ism', '#$2', $string);
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// ignore anything in a code block
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$string = preg_replace('/\[code\](.*?)\[\/code\]/sm', '', $string);
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// Force line feeds at bbtags
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$string = str_replace(['[', ']'], ["\n[", "]\n"], $string);
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// ignore anything in a bbtag
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$string = preg_replace('/\[(.*?)\]/sm', '', $string);
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// Match full names against @tags including the space between first and last
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// We will look these up afterward to see if they are full names or not recognisable.
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if (preg_match_all('/(@[^ \x0D\x0A,:?]+ [^ \x0D\x0A@,:?]+)([ \x0D\x0A@,:?]|$)/', $string, $matches)) {
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foreach ($matches[1] as $match) {
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if (strstr($match, ']')) {
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// we might be inside a bbcode color tag - leave it alone
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continue;
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}
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if (substr($match, -1, 1) === '.') {
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$ret[] = substr($match, 0, -1);
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} else {
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$ret[] = $match;
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}
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}
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}
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// Otherwise pull out single word tags. These can be @nickname, @first_last
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// and #hash tags.
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if (preg_match_all('/([!#@][^\^ \x0D\x0A,;:?]+)([ \x0D\x0A,;:?]|$)/', $string, $matches)) {
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foreach ($matches[1] as $match) {
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if (strstr($match, ']')) {
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// we might be inside a bbcode color tag - leave it alone
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continue;
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}
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if (substr($match, -1, 1) === '.') {
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$match = substr($match,0,-1);
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}
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// ignore strictly numeric tags like #1
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if ((strpos($match, '#') === 0) && ctype_digit(substr($match, 1))) {
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continue;
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}
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// try not to catch url fragments
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if (strpos($string, $match) && preg_match('/[a-zA-z0-9\/]/', substr($string, strpos($string, $match) - 1, 1))) {
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continue;
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}
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$ret[] = $match;
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}
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}
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return $ret;
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}
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/**
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* @brief Normalize url
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*
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* @param string $url URL to be normalized.
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*
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* @return string Normalized URL.
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*/
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public static function normaliseLink($url)
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{
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$ret = str_replace(['https:', '//www.'], ['http:', '//'], $url);
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return rtrim($ret, '/');
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}
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/**
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* @brief Normalize OpenID identity
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*
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* @param string $s OpenID Identity
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*
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* @return string normalized OpenId Identity
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*/
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function normaliseOpenID($s)
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{
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return trim(str_replace(['http://', 'https://'], ['', ''], $s), '/');
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}
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/**
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* @brief Compare two URLs to see if they are the same, but ignore
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* slight but hopefully insignificant differences such as if one
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* is https and the other isn't, or if one is www.something and
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* the other isn't - and also ignore case differences.
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*
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* @param string $a first url
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* @param string $b second url
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* @return boolean True if the URLs match, otherwise False
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*
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*/
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public static function compareLink($a, $b)
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{
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return (strcasecmp(self::normaliseLink($a), self::normaliseLink($b)) === 0);
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}
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}
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