dafd3f081a
@see https://www.php.net/manual/en/intldateformatter.format.php > If a DateTime or an IntlCalendar object is passed, its timezone is not considered. The object will be formatted using the formaterʼs configured timezone. If one wants to use the timezone of the object to be formatted, IntlDateFormatter::setTimeZone() must be called before with the objectʼs timezone.
502 lines
14 KiB
PHP
502 lines
14 KiB
PHP
<?php
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/**
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* Shaarli utilities
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*/
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/**
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* Format log using provided data.
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*
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* @param string $message the message to log
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* @param string|null $clientIp the client's remote IPv4/IPv6 address
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*
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* @return string Formatted message to log
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*/
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function format_log(string $message, string $clientIp = null): string
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{
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$out = $message;
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if (!empty($clientIp)) {
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// Note: we keep the first dash to avoid breaking fail2ban configs
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$out = '- ' . $clientIp . ' - ' . $out;
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}
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return $out;
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}
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/**
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* Returns the small hash of a string, using RFC 4648 base64url format
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*
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* Small hashes:
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* - are unique (well, as unique as crc32, at last)
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* - are always 6 characters long.
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* - only use the following characters: a-z A-Z 0-9 - _ @
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* - are NOT cryptographically secure (they CAN be forged)
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*
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* In Shaarli, they are used as a tinyurl-like link to individual entries,
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* built once with the combination of the date and item ID.
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* e.g. smallHash('20111006_131924' . 142) --> eaWxtQ
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*
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* @warning before v0.8.1, smallhashes were built only with the date,
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* and their value has been preserved.
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*
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* @param string $text Create a hash from this text.
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*
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* @return string generated small hash.
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*/
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function smallHash($text)
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{
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$t = rtrim(base64_encode(hash('crc32', $text, true)), '=');
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return strtr($t, '+/', '-_');
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}
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/**
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* Tells if a string start with a substring
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*
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* @param string $haystack Given string.
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* @param string $needle String to search at the beginning of $haystack.
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* @param bool $case Case sensitive.
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*
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* @return bool True if $haystack starts with $needle.
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*/
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function startsWith($haystack, $needle, $case = true)
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{
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if ($case) {
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return (strcmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
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}
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return (strcasecmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
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}
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/**
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* Tells if a string ends with a substring
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*
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* @param string $haystack Given string.
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* @param string $needle String to search at the end of $haystack.
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* @param bool $case Case sensitive.
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*
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* @return bool True if $haystack ends with $needle.
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*/
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function endsWith($haystack, $needle, $case = true)
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{
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if ($case) {
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return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
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}
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return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
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}
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/**
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* Htmlspecialchars wrapper
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* Support multidimensional array of strings.
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*
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* @param mixed $input Data to escape: a single string or an array of strings.
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*
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* @return string|array escaped.
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*/
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function escape($input)
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{
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if (null === $input) {
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return null;
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}
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if (is_bool($input) || is_int($input) || is_float($input) || $input instanceof DateTimeInterface) {
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return $input;
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}
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if (is_array($input)) {
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$out = [];
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foreach ($input as $key => $value) {
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$out[escape($key)] = escape($value);
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}
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return $out;
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}
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return htmlspecialchars($input, ENT_COMPAT, 'UTF-8', false);
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}
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/**
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* Reverse the escape function.
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*
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* @param string $str the string to unescape.
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*
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* @return string unescaped string.
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*/
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function unescape($str)
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{
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return htmlspecialchars_decode($str);
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}
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/**
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* Sanitize link before rendering.
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*
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* @param array $link Link to escape.
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*/
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function sanitizeLink(&$link)
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{
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$link['url'] = escape($link['url']); // useful?
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$link['title'] = escape($link['title']);
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$link['description'] = escape($link['description']);
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$link['tags'] = escape($link['tags']);
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}
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/**
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* Checks if a string represents a valid date
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* @param string $format The expected DateTime format of the string
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* @param string $string A string-formatted date
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*
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* @return bool whether the string is a valid date
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*
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* @see http://php.net/manual/en/class.datetime.php
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* @see http://php.net/manual/en/datetime.createfromformat.php
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*/
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function checkDateFormat($format, $string)
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{
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$date = DateTime::createFromFormat($format, $string);
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return $date && $date->format($string) == $string;
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}
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/**
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* Generate a header location from HTTP_REFERER.
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* Make sure the referer is Shaarli itself and prevent redirection loop.
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*
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* @param string $referer - HTTP_REFERER.
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* @param string $host - Server HOST.
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* @param array $loopTerms - Contains list of term to prevent redirection loop.
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*
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* @return string $referer - final referer.
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*/
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function generateLocation($referer, $host, $loopTerms = [])
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{
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$finalReferer = './?';
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// No referer if it contains any value in $loopCriteria.
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foreach (array_filter($loopTerms) as $value) {
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if (strpos($referer, $value) !== false) {
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return $finalReferer;
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}
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}
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// Remove port from HTTP_HOST
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if ($pos = strpos($host, ':')) {
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$host = substr($host, 0, $pos);
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}
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$refererHost = parse_url($referer, PHP_URL_HOST);
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if (!empty($referer) && (strpos($refererHost, $host) !== false || startsWith('?', $refererHost))) {
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$finalReferer = $referer;
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}
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return $finalReferer;
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}
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/**
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* Sniff browser language to set the locale automatically.
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* Note that is may not work on your server if the corresponding locale is not installed.
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*
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* @param string $headerLocale Locale send in HTTP headers (e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3").
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**/
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function autoLocale($headerLocale)
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{
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// Default if browser does not send HTTP_ACCEPT_LANGUAGE
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$locales = ['en_US', 'en_US.utf8', 'en_US.UTF-8'];
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if (! empty($headerLocale)) {
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if (preg_match_all('/([a-z]{2,3})[-_]?([a-z]{2})?,?/i', $headerLocale, $matches, PREG_SET_ORDER)) {
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$attempts = [];
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foreach ($matches as $match) {
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$first = [strtolower($match[1]), strtoupper($match[1])];
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$separators = ['_', '-'];
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$encodings = ['utf8', 'UTF-8'];
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if (!empty($match[2])) {
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$second = [strtoupper($match[2]), strtolower($match[2])];
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$items = [$first, $separators, $second, ['.'], $encodings];
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} else {
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$items = [$first, $separators, $first, ['.'], $encodings];
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}
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$attempts = array_merge($attempts, iterator_to_array(cartesian_product_generator($items)));
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}
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if (! empty($attempts)) {
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$locales = array_merge(array_map('implode', $attempts), $locales);
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}
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}
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}
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setlocale(LC_ALL, $locales);
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}
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/**
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* Build a Generator object representing the cartesian product from given $items.
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*
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* Example:
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* [['a'], ['b', 'c']]
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* will generate:
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* [
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* ['a', 'b'],
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* ['a', 'c'],
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* ]
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*
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* @param array $items array of array of string
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*
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* @return Generator representing the cartesian product of given array.
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*
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* @see https://en.wikipedia.org/wiki/Cartesian_product
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*/
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function cartesian_product_generator($items)
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{
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if (empty($items)) {
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yield [];
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}
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$subArray = array_pop($items);
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if (empty($subArray)) {
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return;
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}
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foreach (cartesian_product_generator($items) as $item) {
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foreach ($subArray as $value) {
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yield $item + [count($item) => $value];
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}
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}
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}
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/**
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* Generates a default API secret.
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*
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* Note that the random-ish methods used in this function are predictable,
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* which makes them NOT suitable for crypto.
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* BUT the random string is salted with the salt and hashed with the username.
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* It makes the generated API secret secured enough for Shaarli.
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*
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* PHP 7 provides random_int(), designed for cryptography.
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* More info: http://stackoverflow.com/questions/4356289/php-random-string-generator
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* @param string $username Shaarli login username
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* @param string $salt Shaarli password hash salt
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*
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* @return string|bool Generated API secret, 12 char length.
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* Or false if invalid parameters are provided (which will make the API unusable).
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*/
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function generate_api_secret($username, $salt)
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{
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if (empty($username) || empty($salt)) {
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return false;
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}
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return str_shuffle(substr(hash_hmac('sha512', uniqid($salt), $username), 10, 12));
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}
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/**
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* Trim string, replace sequences of whitespaces by a single space.
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* PHP equivalent to `normalize-space` XSLT function.
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*
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* @param string $string Input string.
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*
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* @return mixed Normalized string.
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*/
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function normalize_spaces($string)
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{
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return preg_replace('/\s{2,}/', ' ', trim($string));
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}
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/**
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* Format the date according to the locale.
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*
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* Requires php-intl to display international datetimes,
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* otherwise default format '%c' will be returned.
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*
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* @param DateTimeInterface $date to format.
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* @param bool $time Displays time if true.
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* @param bool $intl Use international format if true.
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*
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* @return bool|string Formatted date, or false if the input is invalid.
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*/
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function format_date($date, $time = true, $intl = true)
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{
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if (! $date instanceof DateTimeInterface) {
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return false;
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}
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if (! $intl || ! class_exists('IntlDateFormatter')) {
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$format = $time ? '%c' : '%x';
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return strftime($format, $date->getTimestamp());
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}
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$formatter = new IntlDateFormatter(
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setlocale(LC_TIME, 0),
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IntlDateFormatter::LONG,
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$time ? IntlDateFormatter::LONG : IntlDateFormatter::NONE
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);
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$formatter->setTimeZone($date->getTimezone());
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return $formatter->format($date);
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}
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/**
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* Format the date month according to the locale.
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*
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* @param DateTimeInterface $date to format.
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*
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* @return bool|string Formatted date, or false if the input is invalid.
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*/
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function format_month(DateTimeInterface $date)
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{
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if (! $date instanceof DateTimeInterface) {
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return false;
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}
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return strftime('%B', $date->getTimestamp());
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}
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/**
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* Check if the input is an integer, no matter its real type.
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*
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* PHP is a bit messy regarding this:
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* - is_int returns false if the input is a string
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* - ctype_digit returns false if the input is an integer or negative
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*
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* @param mixed $input value
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*
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* @return bool true if the input is an integer, false otherwise
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*/
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function is_integer_mixed($input)
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{
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if (is_array($input) || is_bool($input) || is_object($input)) {
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return false;
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}
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$input = strval($input);
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return ctype_digit($input) || (startsWith($input, '-') && ctype_digit(substr($input, 1)));
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}
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/**
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* Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
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*
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* @param string $val Size expressed in string.
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*
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* @return int Size expressed in bytes.
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*/
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function return_bytes($val)
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{
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if (is_integer_mixed($val) || $val === '0' || empty($val)) {
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return $val;
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}
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$val = trim($val);
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$last = strtolower($val[strlen($val) - 1]);
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$val = intval(substr($val, 0, -1));
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switch ($last) {
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case 'g':
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$val *= 1024;
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// do no break in order 1024^2 for each unit
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case 'm':
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$val *= 1024;
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// do no break in order 1024^2 for each unit
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case 'k':
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$val *= 1024;
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}
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return $val;
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}
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/**
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* Return a human readable size from bytes.
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*
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* @param int $bytes value
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*
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* @return string Human readable size
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*/
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function human_bytes($bytes)
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{
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if ($bytes === '') {
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return t('Setting not set');
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}
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if (! is_integer_mixed($bytes)) {
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return $bytes;
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}
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$bytes = intval($bytes);
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if ($bytes === 0) {
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return t('Unlimited');
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}
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$units = [t('B'), t('kiB'), t('MiB'), t('GiB')];
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for ($i = 0; $i < count($units) && $bytes >= 1024; ++$i) {
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$bytes /= 1024;
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}
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return round($bytes) . $units[$i];
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}
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/**
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* Try to determine max file size for uploads (POST).
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* Returns an integer (in bytes) or formatted depending on $format.
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*
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* @param mixed $limitPost post_max_size PHP setting
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* @param mixed $limitUpload upload_max_filesize PHP setting
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* @param bool $format Format max upload size to human readable size
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*
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* @return int|string max upload file size
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*/
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function get_max_upload_size($limitPost, $limitUpload, $format = true)
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{
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$size1 = return_bytes($limitPost);
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$size2 = return_bytes($limitUpload);
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// Return the smaller of two:
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$maxsize = min($size1, $size2);
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return $format ? human_bytes($maxsize) : $maxsize;
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}
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/**
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* Sort the given array alphabetically using php-intl if available.
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* Case sensitive.
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*
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* Note: doesn't support multidimensional arrays
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*
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* @param array $data Input array, passed by reference
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* @param bool $reverse Reverse sort if set to true
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* @param bool $byKeys Sort the array by keys if set to true, by value otherwise.
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*/
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function alphabetical_sort(&$data, $reverse = false, $byKeys = false)
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{
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$callback = function ($a, $b) use ($reverse) {
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// Collator is part of PHP intl.
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if (class_exists('Collator')) {
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$collator = new Collator(setlocale(LC_COLLATE, 0));
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if (!intl_is_failure(intl_get_error_code())) {
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return $collator->compare($a, $b) * ($reverse ? -1 : 1);
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}
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}
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return strcasecmp($a, $b) * ($reverse ? -1 : 1);
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};
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if ($byKeys) {
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uksort($data, $callback);
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} else {
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usort($data, $callback);
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}
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}
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/**
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* Wrapper function for translation which match the API
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* of gettext()/_() and ngettext().
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*
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* @param string $text Text to translate.
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* @param string $nText The plural message ID.
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* @param int $nb The number of items for plural forms.
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* @param string $domain The domain where the translation is stored (default: shaarli).
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* @param array $variables Associative array of variables to replace in translated text.
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* @param bool $fixCase Apply `ucfirst` on the translated string, might be useful for strings with variables.
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*
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* @return string Text translated.
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*/
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function t($text, $nText = '', $nb = 1, $domain = 'shaarli', $variables = [], $fixCase = false)
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{
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$postFunction = $fixCase ? 'ucfirst' : function ($input) {
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return $input;
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};
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return $postFunction(dn__($domain, $text, $nText, $nb, $variables));
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}
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/**
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* Converts an exception into a printable stack trace string.
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*/
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function exception2text(Throwable $e): string
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{
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return $e->getMessage() . PHP_EOL . $e->getFile() . $e->getLine() . PHP_EOL . $e->getTraceAsString();
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}
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