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1 | <?php | |
2 | /** | |
3 | * Shaarli utilities | |
4 | */ | |
5 | ||
6 | /** | |
7 | * Logs a message to a text file | |
8 | * | |
9 | * The log format is compatible with fail2ban. | |
10 | * | |
11 | * @param string $logFile where to write the logs | |
12 | * @param string $clientIp the client's remote IPv4/IPv6 address | |
13 | * @param string $message the message to log | |
14 | */ | |
15 | function logm($logFile, $clientIp, $message) | |
16 | { | |
17 | file_put_contents( | |
18 | $logFile, | |
19 | date('Y/m/d H:i:s').' - '.$clientIp.' - '.strval($message).PHP_EOL, | |
20 | FILE_APPEND | |
21 | ); | |
22 | } | |
23 | ||
24 | /** | |
25 | * Returns the small hash of a string, using RFC 4648 base64url format | |
26 | * | |
27 | * Small hashes: | |
28 | * - are unique (well, as unique as crc32, at last) | |
29 | * - are always 6 characters long. | |
30 | * - only use the following characters: a-z A-Z 0-9 - _ @ | |
31 | * - are NOT cryptographically secure (they CAN be forged) | |
32 | * | |
33 | * In Shaarli, they are used as a tinyurl-like link to individual entries, | |
34 | * built once with the combination of the date and item ID. | |
35 | * e.g. smallHash('20111006_131924' . 142) --> eaWxtQ | |
36 | * | |
37 | * @warning before v0.8.1, smallhashes were built only with the date, | |
38 | * and their value has been preserved. | |
39 | * | |
40 | * @param string $text Create a hash from this text. | |
41 | * | |
42 | * @return string generated small hash. | |
43 | */ | |
44 | function smallHash($text) | |
45 | { | |
46 | $t = rtrim(base64_encode(hash('crc32', $text, true)), '='); | |
47 | return strtr($t, '+/', '-_'); | |
48 | } | |
49 | ||
50 | /** | |
51 | * Tells if a string start with a substring | |
52 | * | |
53 | * @param string $haystack Given string. | |
54 | * @param string $needle String to search at the beginning of $haystack. | |
55 | * @param bool $case Case sensitive. | |
56 | * | |
57 | * @return bool True if $haystack starts with $needle. | |
58 | */ | |
59 | function startsWith($haystack, $needle, $case = true) | |
60 | { | |
61 | if ($case) { | |
62 | return (strcmp(substr($haystack, 0, strlen($needle)), $needle) === 0); | |
63 | } | |
64 | return (strcasecmp(substr($haystack, 0, strlen($needle)), $needle) === 0); | |
65 | } | |
66 | ||
67 | /** | |
68 | * Tells if a string ends with a substring | |
69 | * | |
70 | * @param string $haystack Given string. | |
71 | * @param string $needle String to search at the end of $haystack. | |
72 | * @param bool $case Case sensitive. | |
73 | * | |
74 | * @return bool True if $haystack ends with $needle. | |
75 | */ | |
76 | function endsWith($haystack, $needle, $case = true) | |
77 | { | |
78 | if ($case) { | |
79 | return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0); | |
80 | } | |
81 | return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0); | |
82 | } | |
83 | ||
84 | /** | |
85 | * Htmlspecialchars wrapper | |
86 | * Support multidimensional array of strings. | |
87 | * | |
88 | * @param mixed $input Data to escape: a single string or an array of strings. | |
89 | * | |
90 | * @return string escaped. | |
91 | */ | |
92 | function escape($input) | |
93 | { | |
94 | if (is_array($input)) { | |
95 | $out = array(); | |
96 | foreach($input as $key => $value) { | |
97 | $out[$key] = escape($value); | |
98 | } | |
99 | return $out; | |
100 | } | |
101 | return htmlspecialchars($input, ENT_COMPAT, 'UTF-8', false); | |
102 | } | |
103 | ||
104 | /** | |
105 | * Reverse the escape function. | |
106 | * | |
107 | * @param string $str the string to unescape. | |
108 | * | |
109 | * @return string unescaped string. | |
110 | */ | |
111 | function unescape($str) | |
112 | { | |
113 | return htmlspecialchars_decode($str); | |
114 | } | |
115 | ||
116 | /** | |
117 | * Sanitize link before rendering. | |
118 | * | |
119 | * @param array $link Link to escape. | |
120 | */ | |
121 | function sanitizeLink(&$link) | |
122 | { | |
123 | $link['url'] = escape($link['url']); // useful? | |
124 | $link['title'] = escape($link['title']); | |
125 | $link['description'] = escape($link['description']); | |
126 | $link['tags'] = escape($link['tags']); | |
127 | } | |
128 | ||
129 | /** | |
130 | * Checks if a string represents a valid date | |
131 | ||
132 | * @param string $format The expected DateTime format of the string | |
133 | * @param string $string A string-formatted date | |
134 | * | |
135 | * @return bool whether the string is a valid date | |
136 | * | |
137 | * @see http://php.net/manual/en/class.datetime.php | |
138 | * @see http://php.net/manual/en/datetime.createfromformat.php | |
139 | */ | |
140 | function checkDateFormat($format, $string) | |
141 | { | |
142 | $date = DateTime::createFromFormat($format, $string); | |
143 | return $date && $date->format($string) == $string; | |
144 | } | |
145 | ||
146 | /** | |
147 | * Generate a header location from HTTP_REFERER. | |
148 | * Make sure the referer is Shaarli itself and prevent redirection loop. | |
149 | * | |
150 | * @param string $referer - HTTP_REFERER. | |
151 | * @param string $host - Server HOST. | |
152 | * @param array $loopTerms - Contains list of term to prevent redirection loop. | |
153 | * | |
154 | * @return string $referer - final referer. | |
155 | */ | |
156 | function generateLocation($referer, $host, $loopTerms = array()) | |
157 | { | |
158 | $finalReferer = '?'; | |
159 | ||
160 | // No referer if it contains any value in $loopCriteria. | |
161 | foreach ($loopTerms as $value) { | |
162 | if (strpos($referer, $value) !== false) { | |
163 | return $finalReferer; | |
164 | } | |
165 | } | |
166 | ||
167 | // Remove port from HTTP_HOST | |
168 | if ($pos = strpos($host, ':')) { | |
169 | $host = substr($host, 0, $pos); | |
170 | } | |
171 | ||
172 | $refererHost = parse_url($referer, PHP_URL_HOST); | |
173 | if (!empty($referer) && (strpos($refererHost, $host) !== false || startsWith('?', $refererHost))) { | |
174 | $finalReferer = $referer; | |
175 | } | |
176 | ||
177 | return $finalReferer; | |
178 | } | |
179 | ||
180 | /** | |
181 | * Validate session ID to prevent Full Path Disclosure. | |
182 | * | |
183 | * See #298. | |
184 | * The session ID's format depends on the hash algorithm set in PHP settings | |
185 | * | |
186 | * @param string $sessionId Session ID | |
187 | * | |
188 | * @return true if valid, false otherwise. | |
189 | * | |
190 | * @see http://php.net/manual/en/function.hash-algos.php | |
191 | * @see http://php.net/manual/en/session.configuration.php | |
192 | */ | |
193 | function is_session_id_valid($sessionId) | |
194 | { | |
195 | if (empty($sessionId)) { | |
196 | return false; | |
197 | } | |
198 | ||
199 | if (!$sessionId) { | |
200 | return false; | |
201 | } | |
202 | ||
203 | if (!preg_match('/^[a-zA-Z0-9,-]{2,128}$/', $sessionId)) { | |
204 | return false; | |
205 | } | |
206 | ||
207 | return true; | |
208 | } | |
209 | ||
210 | /** | |
211 | * Sniff browser language to set the locale automatically. | |
212 | * Note that is may not work on your server if the corresponding locale is not installed. | |
213 | * | |
214 | * @param string $headerLocale Locale send in HTTP headers (e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"). | |
215 | **/ | |
216 | function autoLocale($headerLocale) | |
217 | { | |
218 | // Default if browser does not send HTTP_ACCEPT_LANGUAGE | |
219 | $locales = array('en_US', 'en_US.utf8', 'en_US.UTF-8'); | |
220 | if (! empty($headerLocale)) { | |
221 | if (preg_match_all('/([a-z]{2,3})[-_]?([a-z]{2})?,?/i', $headerLocale, $matches, PREG_SET_ORDER)) { | |
222 | $attempts = []; | |
223 | foreach ($matches as $match) { | |
224 | $first = [strtolower($match[1]), strtoupper($match[1])]; | |
225 | $separators = ['_', '-']; | |
226 | $encodings = ['utf8', 'UTF-8']; | |
227 | if (!empty($match[2])) { | |
228 | $second = [strtoupper($match[2]), strtolower($match[2])]; | |
229 | $items = [$first, $separators, $second, ['.'], $encodings]; | |
230 | } else { | |
231 | $items = [$first, $separators, $first, ['.'], $encodings]; | |
232 | } | |
233 | $attempts = array_merge($attempts, iterator_to_array(cartesian_product_generator($items))); | |
234 | } | |
235 | ||
236 | if (! empty($attempts)) { | |
237 | $locales = array_merge(array_map('implode', $attempts), $locales); | |
238 | } | |
239 | } | |
240 | } | |
241 | ||
242 | setlocale(LC_ALL, $locales); | |
243 | } | |
244 | ||
245 | /** | |
246 | * Build a Generator object representing the cartesian product from given $items. | |
247 | * | |
248 | * Example: | |
249 | * [['a'], ['b', 'c']] | |
250 | * will generate: | |
251 | * [ | |
252 | * ['a', 'b'], | |
253 | * ['a', 'c'], | |
254 | * ] | |
255 | * | |
256 | * @param array $items array of array of string | |
257 | * | |
258 | * @return Generator representing the cartesian product of given array. | |
259 | * | |
260 | * @see https://en.wikipedia.org/wiki/Cartesian_product | |
261 | */ | |
262 | function cartesian_product_generator($items) | |
263 | { | |
264 | if (empty($items)) { | |
265 | yield []; | |
266 | } | |
267 | $subArray = array_pop($items); | |
268 | if (empty($subArray)) { | |
269 | return; | |
270 | } | |
271 | foreach (cartesian_product_generator($items) as $item) { | |
272 | foreach ($subArray as $value) { | |
273 | yield $item + [count($item) => $value]; | |
274 | } | |
275 | } | |
276 | } | |
277 | ||
278 | /** | |
279 | * Generates a default API secret. | |
280 | * | |
281 | * Note that the random-ish methods used in this function are predictable, | |
282 | * which makes them NOT suitable for crypto. | |
283 | * BUT the random string is salted with the salt and hashed with the username. | |
284 | * It makes the generated API secret secured enough for Shaarli. | |
285 | * | |
286 | * PHP 7 provides random_int(), designed for cryptography. | |
287 | * More info: http://stackoverflow.com/questions/4356289/php-random-string-generator | |
288 | ||
289 | * @param string $username Shaarli login username | |
290 | * @param string $salt Shaarli password hash salt | |
291 | * | |
292 | * @return string|bool Generated API secret, 12 char length. | |
293 | * Or false if invalid parameters are provided (which will make the API unusable). | |
294 | */ | |
295 | function generate_api_secret($username, $salt) | |
296 | { | |
297 | if (empty($username) || empty($salt)) { | |
298 | return false; | |
299 | } | |
300 | ||
301 | return str_shuffle(substr(hash_hmac('sha512', uniqid($salt), $username), 10, 12)); | |
302 | } | |
303 | ||
304 | /** | |
305 | * Trim string, replace sequences of whitespaces by a single space. | |
306 | * PHP equivalent to `normalize-space` XSLT function. | |
307 | * | |
308 | * @param string $string Input string. | |
309 | * | |
310 | * @return mixed Normalized string. | |
311 | */ | |
312 | function normalize_spaces($string) | |
313 | { | |
314 | return preg_replace('/\s{2,}/', ' ', trim($string)); | |
315 | } | |
316 | ||
317 | /** | |
318 | * Format the date according to the locale. | |
319 | * | |
320 | * Requires php-intl to display international datetimes, | |
321 | * otherwise default format '%c' will be returned. | |
322 | * | |
323 | * @param DateTime $date to format. | |
324 | * @param bool $time Displays time if true. | |
325 | * @param bool $intl Use international format if true. | |
326 | * | |
327 | * @return bool|string Formatted date, or false if the input is invalid. | |
328 | */ | |
329 | function format_date($date, $time = true, $intl = true) | |
330 | { | |
331 | if (! $date instanceof DateTime) { | |
332 | return false; | |
333 | } | |
334 | ||
335 | if (! $intl || ! class_exists('IntlDateFormatter')) { | |
336 | $format = $time ? '%c' : '%x'; | |
337 | return strftime($format, $date->getTimestamp()); | |
338 | } | |
339 | ||
340 | $formatter = new IntlDateFormatter( | |
341 | setlocale(LC_TIME, 0), | |
342 | IntlDateFormatter::LONG, | |
343 | $time ? IntlDateFormatter::LONG : IntlDateFormatter::NONE | |
344 | ); | |
345 | ||
346 | return $formatter->format($date); | |
347 | } | |
348 | ||
349 | /** | |
350 | * Check if the input is an integer, no matter its real type. | |
351 | * | |
352 | * PHP is a bit messy regarding this: | |
353 | * - is_int returns false if the input is a string | |
354 | * - ctype_digit returns false if the input is an integer or negative | |
355 | * | |
356 | * @param mixed $input value | |
357 | * | |
358 | * @return bool true if the input is an integer, false otherwise | |
359 | */ | |
360 | function is_integer_mixed($input) | |
361 | { | |
362 | if (is_array($input) || is_bool($input) || is_object($input)) { | |
363 | return false; | |
364 | } | |
365 | $input = strval($input); | |
366 | return ctype_digit($input) || (startsWith($input, '-') && ctype_digit(substr($input, 1))); | |
367 | } | |
368 | ||
369 | /** | |
370 | * Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes. | |
371 | * | |
372 | * @param string $val Size expressed in string. | |
373 | * | |
374 | * @return int Size expressed in bytes. | |
375 | */ | |
376 | function return_bytes($val) | |
377 | { | |
378 | if (is_integer_mixed($val) || $val === '0' || empty($val)) { | |
379 | return $val; | |
380 | } | |
381 | $val = trim($val); | |
382 | $last = strtolower($val[strlen($val)-1]); | |
383 | $val = intval(substr($val, 0, -1)); | |
384 | switch($last) { | |
385 | case 'g': $val *= 1024; | |
386 | case 'm': $val *= 1024; | |
387 | case 'k': $val *= 1024; | |
388 | } | |
389 | return $val; | |
390 | } | |
391 | ||
392 | /** | |
393 | * Return a human readable size from bytes. | |
394 | * | |
395 | * @param int $bytes value | |
396 | * | |
397 | * @return string Human readable size | |
398 | */ | |
399 | function human_bytes($bytes) | |
400 | { | |
401 | if ($bytes === '') { | |
402 | return t('Setting not set'); | |
403 | } | |
404 | if (! is_integer_mixed($bytes)) { | |
405 | return $bytes; | |
406 | } | |
407 | $bytes = intval($bytes); | |
408 | if ($bytes === 0) { | |
409 | return t('Unlimited'); | |
410 | } | |
411 | ||
412 | $units = [t('B'), t('kiB'), t('MiB'), t('GiB')]; | |
413 | for ($i = 0; $i < count($units) && $bytes >= 1024; ++$i) { | |
414 | $bytes /= 1024; | |
415 | } | |
416 | ||
417 | return round($bytes) . $units[$i]; | |
418 | } | |
419 | ||
420 | /** | |
421 | * Try to determine max file size for uploads (POST). | |
422 | * Returns an integer (in bytes) or formatted depending on $format. | |
423 | * | |
424 | * @param mixed $limitPost post_max_size PHP setting | |
425 | * @param mixed $limitUpload upload_max_filesize PHP setting | |
426 | * @param bool $format Format max upload size to human readable size | |
427 | * | |
428 | * @return int|string max upload file size | |
429 | */ | |
430 | function get_max_upload_size($limitPost, $limitUpload, $format = true) | |
431 | { | |
432 | $size1 = return_bytes($limitPost); | |
433 | $size2 = return_bytes($limitUpload); | |
434 | // Return the smaller of two: | |
435 | $maxsize = min($size1, $size2); | |
436 | return $format ? human_bytes($maxsize) : $maxsize; | |
437 | } |