4 * Function library for anything related to formatting / validating / sanitizing
8 * Convert an integer (1337) to a string (3jk).
11 function yourls_int2string( $num, $chars = null ) {
13 $chars = yourls_get_shorturl_charset();
15 $len = strlen( $chars );
16 while( $num >= $len ) {
17 $mod = bcmod( $num, $len );
18 $num = bcdiv( $num, $len );
19 $string = $chars[ $mod ] . $string;
21 $string = $chars[ intval( $num ) ] . $string;
23 return yourls_apply_filter( 'int2string', $string, $num, $chars );
27 * Convert a string (3jk) to an integer (1337)
30 function yourls_string2int( $string, $chars = null ) {
32 $chars = yourls_get_shorturl_charset();
34 $string = strrev( $string );
35 $baselen = strlen( $chars );
36 $inputlen = strlen( $string );
37 for ($i = 0; $i < $inputlen; $i++) {
38 $index = strpos( $chars, $string[$i] );
39 $integer = bcadd( $integer, bcmul( $index, bcpow( $baselen, $i ) ) );
42 return yourls_apply_filter( 'string2int', $integer, $string, $chars );
46 * Return a unique(ish) hash for a string to be used as a valid HTML id
49 function yourls_string2htmlid( $string ) {
50 return yourls_apply_filter( 'string2htmlid', 'y'.abs( crc32( $string ) ) );
54 * Make sure a link keyword (ie "1fv" as in "site.com/1fv") is valid.
57 function yourls_sanitize_string( $string ) {
58 // make a regexp pattern with the shorturl charset, and remove everything but this
59 $pattern = yourls_make_regexp_pattern( yourls_get_shorturl_charset() );
60 $valid = substr( preg_replace( '![^'.$pattern.']!', '', $string ), 0, 199 );
62 return yourls_apply_filter( 'sanitize_string', $valid, $string );
66 * Alias function. I was always getting it wrong.
69 function yourls_sanitize_keyword( $keyword ) {
70 return yourls_sanitize_string( $keyword );
74 * Sanitize a page title. No HTML per W3C http://www.w3.org/TR/html401/struct/global.html#h-7.4.2
77 function yourls_sanitize_title( $unsafe_title ) {
78 $title = $unsafe_title;
79 $title = strip_tags( $title );
80 $title = preg_replace( "/\s+/", ' ', trim( $title ) );
81 return yourls_apply_filter( 'sanitize_title', $title, $unsafe_title );
85 * A few sanity checks on the URL. Used for redirection or DB. For display purpose, see yourls_esc_url()
88 function yourls_sanitize_url( $unsafe_url ) {
89 $url = yourls_esc_url( $unsafe_url, 'redirection' );
90 return yourls_apply_filter( 'sanitize_url', $url, $unsafe_url );
94 * Perform a replacement while a string is found, eg $subject = '%0%0%0DDD', $search ='%0D' -> $result =''
96 * Stolen from WP's _deep_replace
99 function yourls_deep_replace( $search, $subject ){
103 foreach( (array) $search as $val ) {
104 while( strpos( $subject, $val ) !== false ) {
106 $subject = str_replace( $val, '', $subject );
115 * Make sure an integer is a valid integer (PHP's intval() limits to too small numbers)
118 function yourls_sanitize_int( $in ) {
119 return ( substr( preg_replace( '/[^0-9]/', '', strval( $in ) ), 0, 20 ) );
123 * Escape a string or an array of strings before DB usage. ALWAYS escape before using in a SQL query. Thanks.
125 * @param string|array $data string or array of strings to be escaped
126 * @return string|array escaped data
128 function yourls_escape( $data ) {
129 if( is_array( $data ) ) {
130 foreach( $data as $k => $v ) {
131 if( is_array( $v ) ) {
132 $data[ $k ] = yourls_escape( $v );
134 $data[ $k ] = yourls_escape_real( $v );
138 $data = yourls_escape_real( $data );
145 * "Real" escape. This function should NOT be called directly. Use yourls_escape() instead.
147 * This function uses a "real" escape if possible, using PDO, MySQL or MySQLi functions,
148 * with a fallback to a "simple" addslashes
149 * If you're implementing a custom DB engine or a custom cache system, you can define an
150 * escape function using filter 'custom_escape_real'
153 * @param string $a string to be escaped
154 * @return string escaped string
156 function yourls_escape_real( $string ) {
158 if( isset( $ydb ) && is_a( $ydb, 'ezSQLcore' ) )
159 return $ydb->escape( $string );
161 // YOURLS DB classes have been bypassed by a custom DB engine or a custom cache layer
162 return yourls_apply_filters( 'custom_escape_real', addslashes( $string ), $string );
166 * Sanitize an IP address
169 function yourls_sanitize_ip( $ip ) {
170 return preg_replace( '/[^0-9a-fA-F:., ]/', '', $ip );
174 * Make sure a date is m(m)/d(d)/yyyy, return false otherwise
177 function yourls_sanitize_date( $date ) {
178 if( !preg_match( '!^\d{1,2}/\d{1,2}/\d{4}$!' , $date ) ) {
185 * Sanitize a date for SQL search. Return false if malformed input.
188 function yourls_sanitize_date_for_sql( $date ) {
189 if( !yourls_sanitize_date( $date ) )
191 return date( 'Y-m-d', strtotime( $date ) );
195 * Return trimmed string
198 function yourls_trim_long_string( $string, $length = 60, $append = '[...]' ) {
199 $newstring = $string;
200 if( function_exists( 'mb_substr' ) ) {
201 if ( mb_strlen( $newstring ) > $length ) {
202 $newstring = mb_substr( $newstring, 0, $length - mb_strlen( $append ), 'UTF-8' ) . $append;
205 if ( strlen( $newstring ) > $length ) {
206 $newstring = substr( $newstring, 0, $length - strlen( $append ) ) . $append;
209 return yourls_apply_filter( 'trim_long_string', $newstring, $string, $length, $append );
213 * Sanitize a version number (1.4.1-whatever -> 1.4.1)
216 function yourls_sanitize_version( $ver ) {
217 return preg_replace( '/[^0-9.]/', '', $ver );
221 * Sanitize a filename (no Win32 stuff)
224 function yourls_sanitize_filename( $file ) {
225 $file = str_replace( '\\', '/', $file ); // sanitize for Win32 installs
226 $file = preg_replace( '|/+|' ,'/', $file ); // remove any duplicate slash
231 * Check if a string seems to be UTF-8. Stolen from WP.
234 function yourls_seems_utf8( $str ) {
235 $length = strlen( $str );
236 for ( $i=0; $i < $length; $i++ ) {
237 $c = ord( $str[ $i ] );
238 if ( $c < 0x80 ) $n = 0; # 0bbbbbbb
239 elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb
240 elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb
241 elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb
242 elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb
243 elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b
244 else return false; # Does not match any model
245 for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?
246 if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))
254 * Checks for invalid UTF8 in a string. Stolen from WP
258 * @param string $string The text which is to be checked.
259 * @param boolean $strip Optional. Whether to attempt to strip out invalid UTF8. Default is false.
260 * @return string The checked text.
262 function yourls_check_invalid_utf8( $string, $strip = false ) {
263 $string = (string) $string;
265 if ( 0 === strlen( $string ) ) {
269 // Check for support for utf8 in the installed PCRE library once and store the result in a static
271 if ( !isset( $utf8_pcre ) ) {
272 $utf8_pcre = @preg_match( '/^./u', 'a' );
274 // We can't demand utf8 in the PCRE installation, so just return the string in those cases
279 // preg_match fails when it encounters invalid UTF8 in $string
280 if ( 1 === @preg_match( '/^./us', $string ) ) {
284 // Attempt to strip the bad chars if requested (not recommended)
285 if ( $strip && function_exists( 'iconv' ) ) {
286 return iconv( 'utf-8', 'utf-8', $string );
293 * Converts a number of special characters into their HTML entities. Stolen from WP.
295 * Specifically deals with: &, <, >, ", and '.
297 * $quote_style can be set to ENT_COMPAT to encode " to
298 * ", or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.
302 * @param string $string The text which is to be encoded.
303 * @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.
304 * @param boolean $double_encode Optional. Whether to encode existing html entities. Default is false.
305 * @return string The encoded text with HTML entities.
307 function yourls_specialchars( $string, $quote_style = ENT_NOQUOTES, $double_encode = false ) {
308 $string = (string) $string;
310 if ( 0 === strlen( $string ) )
313 // Don't bother if there are no specialchars - saves some processing
314 if ( ! preg_match( '/[&<>"\']/', $string ) )
317 // Account for the previous behaviour of the function when the $quote_style is not an accepted value
318 if ( empty( $quote_style ) )
319 $quote_style = ENT_NOQUOTES;
320 elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) )
321 $quote_style = ENT_QUOTES;
325 $_quote_style = $quote_style;
327 if ( $quote_style === 'double' ) {
328 $quote_style = ENT_COMPAT;
329 $_quote_style = ENT_COMPAT;
330 } elseif ( $quote_style === 'single' ) {
331 $quote_style = ENT_NOQUOTES;
334 // Handle double encoding ourselves
335 if ( $double_encode ) {
336 $string = @htmlspecialchars( $string, $quote_style, $charset );
338 // Decode & into &
339 $string = yourls_specialchars_decode( $string, $_quote_style );
341 // Guarantee every &entity; is valid or re-encode the &
342 $string = yourls_kses_normalize_entities( $string );
344 // Now re-encode everything except &entity;
345 $string = preg_split( '/(&#?x?[0-9a-z]+;)/i', $string, -1, PREG_SPLIT_DELIM_CAPTURE );
347 for ( $i = 0; $i < count( $string ); $i += 2 )
348 $string[$i] = @htmlspecialchars( $string[$i], $quote_style, $charset );
350 $string = implode( '', $string );
353 // Backwards compatibility
354 if ( 'single' === $_quote_style )
355 $string = str_replace( "'", ''', $string );
361 * Converts a number of HTML entities into their special characters. Stolen from WP.
363 * Specifically deals with: &, <, >, ", and '.
365 * $quote_style can be set to ENT_COMPAT to decode " entities,
366 * or ENT_QUOTES to do both " and '. Default is ENT_NOQUOTES where no quotes are decoded.
370 * @param string $string The text which is to be decoded.
371 * @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old _wp_specialchars() values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.
372 * @return string The decoded text without HTML entities.
374 function yourls_specialchars_decode( $string, $quote_style = ENT_NOQUOTES ) {
375 $string = (string) $string;
377 if ( 0 === strlen( $string ) ) {
381 // Don't bother if there are no entities - saves a lot of processing
382 if ( strpos( $string, '&' ) === false ) {
386 // Match the previous behaviour of _wp_specialchars() when the $quote_style is not an accepted value
387 if ( empty( $quote_style ) ) {
388 $quote_style = ENT_NOQUOTES;
389 } elseif ( !in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {
390 $quote_style = ENT_QUOTES;
393 // More complete than get_html_translation_table( HTML_SPECIALCHARS )
394 $single = array( ''' => '\'', ''' => '\'' );
395 $single_preg = array( '/�*39;/' => ''', '/�*27;/i' => ''' );
396 $double = array( '"' => '"', '"' => '"', '"' => '"' );
397 $double_preg = array( '/�*34;/' => '"', '/�*22;/i' => '"' );
398 $others = array( '<' => '<', '<' => '<', '>' => '>', '>' => '>', '&' => '&', '&' => '&', '&' => '&' );
399 $others_preg = array( '/�*60;/' => '<', '/�*62;/' => '>', '/�*38;/' => '&', '/�*26;/i' => '&' );
401 if ( $quote_style === ENT_QUOTES ) {
402 $translation = array_merge( $single, $double, $others );
403 $translation_preg = array_merge( $single_preg, $double_preg, $others_preg );
404 } elseif ( $quote_style === ENT_COMPAT || $quote_style === 'double' ) {
405 $translation = array_merge( $double, $others );
406 $translation_preg = array_merge( $double_preg, $others_preg );
407 } elseif ( $quote_style === 'single' ) {
408 $translation = array_merge( $single, $others );
409 $translation_preg = array_merge( $single_preg, $others_preg );
410 } elseif ( $quote_style === ENT_NOQUOTES ) {
411 $translation = $others;
412 $translation_preg = $others_preg;
415 // Remove zero padding on numeric entities
416 $string = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $string );
418 // Replace characters according to translation table
419 return strtr( $string, $translation );
424 * Escaping for HTML blocks. Stolen from WP
428 * @param string $text
431 function yourls_esc_html( $text ) {
432 $safe_text = yourls_check_invalid_utf8( $text );
433 $safe_text = yourls_specialchars( $safe_text, ENT_QUOTES );
434 return yourls_apply_filters( 'esc_html', $safe_text, $text );
438 * Escaping for HTML attributes. Stolen from WP
442 * @param string $text
445 function yourls_esc_attr( $text ) {
446 $safe_text = yourls_check_invalid_utf8( $text );
447 $safe_text = yourls_specialchars( $safe_text, ENT_QUOTES );
448 return yourls_apply_filters( 'esc_attr', $safe_text, $text );
452 * Checks and cleans a URL before printing it. Stolen from WP.
454 * A number of characters are removed from the URL. If the URL is for displaying
455 * (the default behaviour) ampersands are also replaced.
459 * @param string $url The URL to be cleaned.
460 * @param string $context 'display' or something else. Use yourls_sanitize_url() for database or redirection usage.
461 * @param array $protocols Optional. Array of allowed protocols, defaults to global $yourls_allowedprotocols
462 * @return string The cleaned $url
464 function yourls_esc_url( $url, $context = 'display', $protocols = array() ) {
465 // make sure there's only one 'http://' at the beginning (prevents pasting a URL right after the default 'http://')
467 array( 'http://http://', 'http://https://' ),
468 array( 'http://', 'https://' ),
475 // make sure there's a protocol, add http:// if not
476 if ( ! yourls_get_protocol( $url ) )
477 $url = 'http://'.$url;
479 // force scheme and domain to lowercase - see issue 591
480 preg_match( '!^([a-zA-Z]+://([^/]+))(.*)$!', $url, $matches );
481 if( isset( $matches[1] ) && isset( $matches[3] ) )
482 $url = strtolower( $matches[1] ) . $matches[3];
484 $original_url = $url;
486 $url = preg_replace( '|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url );
487 // Previous regexp in YOURLS was '|[^a-z0-9-~+_.?\[\]\^#=!&;,/:%@$\|*`\'<>"()\\x80-\\xff\{\}]|i'
488 // TODO: check if that was it too destructive
489 $strip = array( '%0d', '%0a', '%0D', '%0A' );
490 $url = yourls_deep_replace( $strip, $url );
491 $url = str_replace( ';//', '://', $url );
493 // Replace ampersands and single quotes only when displaying.
494 if ( 'display' == $context ) {
495 $url = yourls_kses_normalize_entities( $url );
496 $url = str_replace( '&', '&', $url );
497 $url = str_replace( "'", ''', $url );
500 if ( ! is_array( $protocols ) or ! $protocols ) {
501 global $yourls_allowedprotocols;
502 $protocols = yourls_apply_filter( 'esc_url_protocols', $yourls_allowedprotocols );
503 // Note: $yourls_allowedprotocols is also globally filterable in functions-kses.php/yourls_kses_init()
506 if ( !yourls_is_allowed_protocol( $url, $protocols ) )
509 // I didn't use KSES function kses_bad_protocol() because it doesn't work the way I liked (returns //blah from illegal://blah)
511 $url = substr( $url, 0, 1999 );
513 return yourls_apply_filter( 'esc_url', $url, $original_url, $context );
517 * Escape single quotes, htmlspecialchar " < > &, and fix line endings. Stolen from WP.
519 * Escapes text strings for echoing in JS. It is intended to be used for inline JS
520 * (in a tag attribute, for example onclick="..."). Note that the strings have to
521 * be in single quotes. The filter 'js_escape' is also applied here.
525 * @param string $text The text to be escaped.
526 * @return string Escaped text.
528 function yourls_esc_js( $text ) {
529 $safe_text = yourls_check_invalid_utf8( $text );
530 $safe_text = yourls_specialchars( $safe_text, ENT_COMPAT );
531 $safe_text = preg_replace( '/&#(x)?0*(?(1)27|39);?/i', "'", stripslashes( $safe_text ) );
532 $safe_text = str_replace( "\r", '', $safe_text );
533 $safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) );
534 return yourls_apply_filters( 'esc_js', $safe_text, $text );
538 * Escaping for textarea values. Stolen from WP.
542 * @param string $text
545 function yourls_esc_textarea( $text ) {
546 $safe_text = htmlspecialchars( $text, ENT_QUOTES );
547 return yourls_apply_filters( 'esc_textarea', $safe_text, $text );
552 * PHP emulation of JS's encodeURI
554 * @link https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/encodeURI
558 function yourls_encodeURI( $url ) {
559 // Decode URL all the way
560 $result = yourls_rawurldecode_while_encoded( $url );
562 $result = strtr( rawurlencode( $result ), array (
563 '%3B' => ';', '%2C' => ',', '%2F' => '/', '%3F' => '?', '%3A' => ':', '%40' => '@',
564 '%26' => '&', '%3D' => '=', '%2B' => '+', '%24' => '$', '%21' => '!', '%2A' => '*',
565 '%27' => '\'', '%28' => '(', '%29' => ')', '%23' => '#',
568 // Known limit: this will most likely break IDN URLs such as http://www.académie-française.fr/
569 // To fully support IDN URLs, advocate use of a plugin.
570 return yourls_apply_filter( 'encodeURI', $result, $url );
574 * Adds backslashes before letters and before a number at the start of a string. Stolen from WP.
578 * @param string $string Value to which backslashes will be added.
579 * @return string String with backslashes inserted.
581 function yourls_backslashit($string) {
582 $string = preg_replace('/^([0-9])/', '\\\\\\\\\1', $string);
583 $string = preg_replace('/([a-z])/i', '\\\\\1', $string);
588 * Check if a string seems to be urlencoded
590 * We use rawurlencode instead of urlencode to avoid messing with '+'
593 * @param string $string
596 function yourls_is_rawurlencoded( $string ) {
597 return rawurldecode( $string ) != $string;
601 * rawurldecode a string till it's not encoded anymore
603 * Deals with multiple encoding (eg "%2521" => "%21" => "!").
604 * See https://github.com/YOURLS/YOURLS/issues/1303
607 * @param string $string
610 function yourls_rawurldecode_while_encoded( $string ) {
611 $string = rawurldecode( $string );
612 if( yourls_is_rawurlencoded( $string ) ) {
613 $string = yourls_rawurldecode_while_encoded( $string );