8 * Determine the allowed character set in short URLs
11 function yourls_get_shorturl_charset() {
12 static $charset = null;
13 if( $charset !== null )
16 if( defined('YOURLS_URL_CONVERT') && in_array( YOURLS_URL_CONVERT, array( 62, 64 ) ) ) {
17 $charset = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
19 // defined to 36, or wrongly defined
20 $charset = '0123456789abcdefghijklmnopqrstuvwxyz';
23 $charset = yourls_apply_filter( 'get_shorturl_charset', $charset );
28 * Make an optimized regexp pattern from a string of characters
31 function yourls_make_regexp_pattern( $string ) {
32 $pattern = preg_quote( $string, '-' ); // add - as an escaped characters -- this is fixed in PHP 5.3
33 // TODO: replace char sequences by smart sequences such as 0-9, a-z, A-Z ... ?
38 * Is a URL a short URL? Accept either 'http://sho.rt/abc' or 'abc'
41 function yourls_is_shorturl( $shorturl ) {
42 // TODO: make sure this function evolves with the feature set.
46 // Is $shorturl a URL (http://sho.rt/abc) or a keyword (abc) ?
47 if( yourls_get_protocol( $shorturl ) ) {
48 $keyword = yourls_get_relative_url( $shorturl );
53 // Check if it's a valid && used keyword
54 if( $keyword && $keyword == yourls_sanitize_string( $keyword ) && yourls_keyword_is_taken( $keyword ) ) {
58 return yourls_apply_filter( 'is_shorturl', $is_short, $shorturl );
62 * Check to see if a given keyword is reserved (ie reserved URL or an existing page). Returns bool
65 function yourls_keyword_is_reserved( $keyword ) {
66 global $yourls_reserved_URL;
67 $keyword = yourls_sanitize_keyword( $keyword );
70 if ( in_array( $keyword, $yourls_reserved_URL)
71 or file_exists( YOURLS_ABSPATH ."/pages/$keyword.php" )
72 or is_dir( YOURLS_ABSPATH ."/$keyword" )
76 return yourls_apply_filter( 'keyword_is_reserved', $reserved, $keyword );
80 * Function: Get client IP Address. Returns a DB safe string.
83 function yourls_get_IP() {
86 // Precedence: if set, X-Forwarded-For > HTTP_X_FORWARDED_FOR > HTTP_CLIENT_IP > HTTP_VIA > REMOTE_ADDR
87 $headers = array( 'X-Forwarded-For', 'HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'HTTP_VIA', 'REMOTE_ADDR' );
88 foreach( $headers as $header ) {
89 if ( !empty( $_SERVER[ $header ] ) ) {
90 $ip = $_SERVER[ $header ];
95 // headers can contain multiple IPs (X-Forwarded-For = client, proxy1, proxy2). Take first one.
96 if ( strpos( $ip, ',' ) !== false )
97 $ip = substr( $ip, 0, strpos( $ip, ',' ) );
99 return yourls_apply_filter( 'get_IP', yourls_sanitize_ip( $ip ) );
103 * Get next id a new link will have if no custom keyword provided
106 function yourls_get_next_decimal() {
107 return yourls_apply_filter( 'get_next_decimal', (int)yourls_get_option( 'next_id' ) );
111 * Update id for next link with no custom keyword
114 function yourls_update_next_decimal( $int = '' ) {
115 $int = ( $int == '' ) ? yourls_get_next_decimal() + 1 : (int)$int ;
116 $update = yourls_update_option( 'next_id', $int );
117 yourls_do_action( 'update_next_decimal', $int, $update );
122 * Delete a link in the DB
125 function yourls_delete_link_by_keyword( $keyword ) {
126 // Allow plugins to short-circuit the whole function
127 $pre = yourls_apply_filter( 'shunt_delete_link_by_keyword', null, $keyword );
133 $table = YOURLS_DB_TABLE_URL;
134 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
135 $delete = $ydb->query("DELETE FROM `$table` WHERE `keyword` = '$keyword';");
136 yourls_do_action( 'delete_link', $keyword, $delete );
141 * SQL query to insert a new link in the DB. Returns boolean for success or failure of the inserting
144 function yourls_insert_link_in_db( $url, $keyword, $title = '' ) {
147 $url = yourls_escape( yourls_sanitize_url( $url ) );
148 $keyword = yourls_escape( yourls_sanitize_keyword( $keyword ) );
149 $title = yourls_escape( yourls_sanitize_title( $title ) );
151 $table = YOURLS_DB_TABLE_URL;
152 $timestamp = date('Y-m-d H:i:s');
153 $ip = yourls_get_IP();
154 $insert = $ydb->query("INSERT INTO `$table` (`keyword`, `url`, `title`, `timestamp`, `ip`, `clicks`) VALUES('$keyword', '$url', '$title', '$timestamp', '$ip', 0);");
156 yourls_do_action( 'insert_link', (bool)$insert, $url, $keyword, $title, $timestamp, $ip );
158 return (bool)$insert;
162 * Check if a URL already exists in the DB. Return NULL (doesn't exist) or an object with URL informations.
165 function yourls_url_exists( $url ) {
166 // Allow plugins to short-circuit the whole function
167 $pre = yourls_apply_filter( 'shunt_url_exists', false, $url );
168 if ( false !== $pre )
172 $table = YOURLS_DB_TABLE_URL;
173 $url = yourls_escape( yourls_sanitize_url( $url) );
174 $url_exists = $ydb->get_row( "SELECT * FROM `$table` WHERE `url` = '".$url."';" );
176 return yourls_apply_filter( 'url_exists', $url_exists, $url );
180 * Add a new link in the DB, either with custom keyword, or find one
183 function yourls_add_new_link( $url, $keyword = '', $title = '' ) {
184 // Allow plugins to short-circuit the whole function
185 $pre = yourls_apply_filter( 'shunt_add_new_link', false, $url, $keyword, $title );
186 if ( false !== $pre )
189 $url = yourls_encodeURI( $url );
190 $url = yourls_escape( yourls_sanitize_url( $url ) );
191 if ( !$url || $url == 'http://' || $url == 'https://' ) {
192 $return['status'] = 'fail';
193 $return['code'] = 'error:nourl';
194 $return['message'] = yourls__( 'Missing or malformed URL' );
195 $return['errorCode'] = '400';
196 return yourls_apply_filter( 'add_new_link_fail_nourl', $return, $url, $keyword, $title );
200 $ip = yourls_get_IP();
201 yourls_check_IP_flood( $ip );
203 // Prevent internal redirection loops: cannot shorten a shortened URL
204 if( yourls_get_relative_url( $url ) ) {
205 if( yourls_is_shorturl( $url ) ) {
206 $return['status'] = 'fail';
207 $return['code'] = 'error:noloop';
208 $return['message'] = yourls__( 'URL is a short URL' );
209 $return['errorCode'] = '400';
210 return yourls_apply_filter( 'add_new_link_fail_noloop', $return, $url, $keyword, $title );
214 yourls_do_action( 'pre_add_new_link', $url, $keyword, $title );
216 $strip_url = stripslashes( $url );
219 // duplicates allowed or new URL => store it
220 if( yourls_allow_duplicate_longurls() || !( $url_exists = yourls_url_exists( $url ) ) ) {
222 if( isset( $title ) && !empty( $title ) ) {
223 $title = yourls_sanitize_title( $title );
225 $title = yourls_get_remote_title( $url );
227 $title = yourls_apply_filter( 'add_new_title', $title, $url, $keyword );
229 // Custom keyword provided
232 yourls_do_action( 'add_new_link_custom_keyword', $url, $keyword, $title );
234 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
235 $keyword = yourls_apply_filter( 'custom_keyword', $keyword, $url, $title );
236 if ( !yourls_keyword_is_free( $keyword ) ) {
237 // This shorturl either reserved or taken already
238 $return['status'] = 'fail';
239 $return['code'] = 'error:keyword';
240 $return['message'] = yourls_s( 'Short URL %s already exists in database or is reserved', $keyword );
242 // all clear, store !
243 yourls_insert_link_in_db( $url, $keyword, $title );
244 $return['url'] = array('keyword' => $keyword, 'url' => $strip_url, 'title' => $title, 'date' => date('Y-m-d H:i:s'), 'ip' => $ip );
245 $return['status'] = 'success';
246 $return['message'] = /* //translators: eg "http://someurl/ added to DB" */ yourls_s( '%s added to database', yourls_trim_long_string( $strip_url ) );
247 $return['title'] = $title;
248 $return['html'] = yourls_table_add_row( $keyword, $url, $title, $ip, 0, time() );
249 $return['shorturl'] = YOURLS_SITE .'/'. $keyword;
252 // Create random keyword
255 yourls_do_action( 'add_new_link_create_keyword', $url, $keyword, $title );
257 $timestamp = date( 'Y-m-d H:i:s' );
258 $id = yourls_get_next_decimal();
261 $keyword = yourls_int2string( $id );
262 $keyword = yourls_apply_filter( 'random_keyword', $keyword, $url, $title );
263 if ( yourls_keyword_is_free($keyword) ) {
264 if( @yourls_insert_link_in_db( $url, $keyword, $title ) ){
265 // everything ok, populate needed vars
266 $return['url'] = array('keyword' => $keyword, 'url' => $strip_url, 'title' => $title, 'date' => $timestamp, 'ip' => $ip );
267 $return['status'] = 'success';
268 $return['message'] = /* //translators: eg "http://someurl/ added to DB" */ yourls_s( '%s added to database', yourls_trim_long_string( $strip_url ) );
269 $return['title'] = $title;
270 $return['html'] = yourls_table_add_row( $keyword, $url, $title, $ip, 0, time() );
271 $return['shorturl'] = YOURLS_SITE .'/'. $keyword;
273 // database error, couldnt store result
274 $return['status'] = 'fail';
275 $return['code'] = 'error:db';
276 $return['message'] = yourls_s( 'Error saving url to database' );
282 @yourls_update_next_decimal( $id );
285 // URL was already stored
288 yourls_do_action( 'add_new_link_already_stored', $url, $keyword, $title );
290 $return['status'] = 'fail';
291 $return['code'] = 'error:url';
292 $return['url'] = array( 'keyword' => $url_exists->keyword, 'url' => $strip_url, 'title' => $url_exists->title, 'date' => $url_exists->timestamp, 'ip' => $url_exists->ip, 'clicks' => $url_exists->clicks );
293 $return['message'] = /* //translators: eg "http://someurl/ already exists" */ yourls_s( '%s already exists in database', yourls_trim_long_string( $strip_url ) );
294 $return['title'] = $url_exists->title;
295 $return['shorturl'] = YOURLS_SITE .'/'. $url_exists->keyword;
298 yourls_do_action( 'post_add_new_link', $url, $keyword, $title );
300 $return['statusCode'] = 200; // regardless of result, this is still a valid request
301 return yourls_apply_filter( 'add_new_link', $return, $url, $keyword, $title );
309 function yourls_edit_link( $url, $keyword, $newkeyword='', $title='' ) {
310 // Allow plugins to short-circuit the whole function
311 $pre = yourls_apply_filter( 'shunt_edit_link', null, $keyword, $url, $keyword, $newkeyword, $title );
317 $table = YOURLS_DB_TABLE_URL;
318 $url = yourls_escape (yourls_sanitize_url( $url ) );
319 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
320 $title = yourls_escape( yourls_sanitize_title( $title ) );
321 $newkeyword = yourls_escape( yourls_sanitize_string( $newkeyword ) );
322 $strip_url = stripslashes( $url );
323 $strip_title = stripslashes( $title );
324 $old_url = $ydb->get_var( "SELECT `url` FROM `$table` WHERE `keyword` = '$keyword';" );
326 // Check if new URL is not here already
327 if ( $old_url != $url && !yourls_allow_duplicate_longurls() ) {
328 $new_url_already_there = intval($ydb->get_var("SELECT COUNT(keyword) FROM `$table` WHERE `url` = '$url';"));
330 $new_url_already_there = false;
333 // Check if the new keyword is not here already
334 if ( $newkeyword != $keyword ) {
335 $keyword_is_ok = yourls_keyword_is_free( $newkeyword );
337 $keyword_is_ok = true;
340 yourls_do_action( 'pre_edit_link', $url, $keyword, $newkeyword, $new_url_already_there, $keyword_is_ok );
343 if ( ( !$new_url_already_there || yourls_allow_duplicate_longurls() ) && $keyword_is_ok ) {
344 $update_url = $ydb->query( "UPDATE `$table` SET `url` = '$url', `keyword` = '$newkeyword', `title` = '$title' WHERE `keyword` = '$keyword';" );
346 $return['url'] = array( 'keyword' => $newkeyword, 'shorturl' => YOURLS_SITE.'/'.$newkeyword, 'url' => $strip_url, 'display_url' => yourls_trim_long_string( $strip_url ), 'title' => $strip_title, 'display_title' => yourls_trim_long_string( $strip_title ) );
347 $return['status'] = 'success';
348 $return['message'] = yourls__( 'Link updated in database' );
350 $return['status'] = 'fail';
351 $return['message'] = /* //translators: "Error updating http://someurl/ (Shorturl: http://sho.rt/blah)" */ yourls_s( 'Error updating %s (Short URL: %s)', yourls_trim_long_string( $strip_url ), $keyword ) ;
356 $return['status'] = 'fail';
357 $return['message'] = yourls__( 'URL or keyword already exists in database' );
360 return yourls_apply_filter( 'edit_link', $return, $url, $keyword, $newkeyword, $title, $new_url_already_there, $keyword_is_ok );
364 * Update a title link (no checks for duplicates etc..)
367 function yourls_edit_link_title( $keyword, $title ) {
368 // Allow plugins to short-circuit the whole function
369 $pre = yourls_apply_filter( 'shunt_edit_link_title', null, $keyword, $title );
375 $keyword = yourls_escape( yourls_sanitize_keyword( $keyword ) );
376 $title = yourls_escape( yourls_sanitize_title( $title ) );
378 $table = YOURLS_DB_TABLE_URL;
379 $update = $ydb->query("UPDATE `$table` SET `title` = '$title' WHERE `keyword` = '$keyword';");
386 * Check if keyword id is free (ie not already taken, and not reserved). Return bool.
389 function yourls_keyword_is_free( $keyword ) {
391 if ( yourls_keyword_is_reserved( $keyword ) or yourls_keyword_is_taken( $keyword ) )
394 return yourls_apply_filter( 'keyword_is_free', $free, $keyword );
398 * Check if a keyword is taken (ie there is already a short URL with this id). Return bool.
401 function yourls_keyword_is_taken( $keyword ) {
403 // Allow plugins to short-circuit the whole function
404 $pre = yourls_apply_filter( 'shunt_keyword_is_taken', false, $keyword );
405 if ( false !== $pre )
409 $keyword = yourls_escape( yourls_sanitize_keyword( $keyword ) );
411 $table = YOURLS_DB_TABLE_URL;
412 $already_exists = $ydb->get_var( "SELECT COUNT(`keyword`) FROM `$table` WHERE `keyword` = '$keyword';" );
413 if ( $already_exists )
416 return yourls_apply_filter( 'keyword_is_taken', $taken, $keyword );
423 function yourls_xml_encode( $array ) {
424 require_once( YOURLS_INC.'/functions-xml.php' );
425 $converter= new yourls_array2xml;
426 return $converter->array2xml( $array );
430 * Return array of all information associated with keyword. Returns false if keyword not found. Set optional $use_cache to false to force fetching from DB
433 function yourls_get_keyword_infos( $keyword, $use_cache = true ) {
435 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
437 yourls_do_action( 'pre_get_keyword', $keyword, $use_cache );
439 if( isset( $ydb->infos[$keyword] ) && $use_cache == true ) {
440 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
443 yourls_do_action( 'get_keyword_not_cached', $keyword );
445 $table = YOURLS_DB_TABLE_URL;
446 $infos = $ydb->get_row( "SELECT * FROM `$table` WHERE `keyword` = '$keyword'" );
449 $infos = (array)$infos;
450 $ydb->infos[ $keyword ] = $infos;
452 $ydb->infos[ $keyword ] = false;
455 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
459 * Return (string) selected information associated with a keyword. Optional $notfound = string default message if nothing found
462 function yourls_get_keyword_info( $keyword, $field, $notfound = false ) {
464 // Allow plugins to short-circuit the whole function
465 $pre = yourls_apply_filter( 'shunt_get_keyword_info', false, $keyword, $field, $notfound );
466 if ( false !== $pre )
469 $keyword = yourls_sanitize_string( $keyword );
470 $infos = yourls_get_keyword_infos( $keyword );
473 if ( isset( $infos[ $field ] ) && $infos[ $field ] !== false )
474 $return = $infos[ $field ];
476 return yourls_apply_filter( 'get_keyword_info', $return, $keyword, $field, $notfound );
480 * Return title associated with keyword. Optional $notfound = string default message if nothing found
483 function yourls_get_keyword_title( $keyword, $notfound = false ) {
484 return yourls_get_keyword_info( $keyword, 'title', $notfound );
488 * Return long URL associated with keyword. Optional $notfound = string default message if nothing found
491 function yourls_get_keyword_longurl( $keyword, $notfound = false ) {
492 return yourls_get_keyword_info( $keyword, 'url', $notfound );
496 * Return number of clicks on a keyword. Optional $notfound = string default message if nothing found
499 function yourls_get_keyword_clicks( $keyword, $notfound = false ) {
500 return yourls_get_keyword_info( $keyword, 'clicks', $notfound );
504 * Return IP that added a keyword. Optional $notfound = string default message if nothing found
507 function yourls_get_keyword_IP( $keyword, $notfound = false ) {
508 return yourls_get_keyword_info( $keyword, 'ip', $notfound );
512 * Return timestamp associated with a keyword. Optional $notfound = string default message if nothing found
515 function yourls_get_keyword_timestamp( $keyword, $notfound = false ) {
516 return yourls_get_keyword_info( $keyword, 'timestamp', $notfound );
520 * Update click count on a short URL. Return 0/1 for error/success.
523 function yourls_update_clicks( $keyword, $clicks = false ) {
524 // Allow plugins to short-circuit the whole function
525 $pre = yourls_apply_filter( 'shunt_update_clicks', false, $keyword, $clicks );
526 if ( false !== $pre )
530 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
531 $table = YOURLS_DB_TABLE_URL;
532 if ( $clicks !== false && is_int( $clicks ) && $clicks >= 0 )
533 $update = $ydb->query( "UPDATE `$table` SET `clicks` = $clicks WHERE `keyword` = '$keyword'" );
535 $update = $ydb->query( "UPDATE `$table` SET `clicks` = clicks + 1 WHERE `keyword` = '$keyword'" );
537 yourls_do_action( 'update_clicks', $keyword, $update, $clicks );
542 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
545 function yourls_get_stats( $filter = 'top', $limit = 10, $start = 0 ) {
554 $sort_by = 'timestamp';
555 $sort_order = 'desc';
565 $sort_order = 'desc';
570 $limit = intval( $limit );
571 $start = intval( $start );
574 $table_url = YOURLS_DB_TABLE_URL;
575 $results = $ydb->get_results( "SELECT * FROM `$table_url` WHERE 1=1 ORDER BY `$sort_by` $sort_order LIMIT $start, $limit;" );
580 foreach ( (array)$results as $res ) {
581 $return['links']['link_'.$i++] = array(
582 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
584 'title' => $res->title,
585 'timestamp'=> $res->timestamp,
587 'clicks' => $res->clicks,
592 $return['stats'] = yourls_get_db_stats();
594 $return['statusCode'] = 200;
596 return yourls_apply_filter( 'get_stats', $return, $filter, $limit, $start );
600 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
603 function yourls_get_link_stats( $shorturl ) {
606 $table_url = YOURLS_DB_TABLE_URL;
607 $shorturl = yourls_escape( yourls_sanitize_keyword( $shorturl ) );
609 $res = $ydb->get_row( "SELECT * FROM `$table_url` WHERE keyword = '$shorturl';" );
616 'message' => 'Error: short URL not found',
621 'message' => 'success',
623 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
625 'title' => $res->title,
626 'timestamp'=> $res->timestamp,
628 'clicks' => $res->clicks,
633 return yourls_apply_filter( 'get_link_stats', $return, $shorturl );
637 * Get total number of URLs and sum of clicks. Input: optional "AND WHERE" clause. Returns array
639 * IMPORTANT NOTE: make sure arguments for the $where clause have been sanitized and yourls_escape()'d
640 * before calling this function.
643 function yourls_get_db_stats( $where = '' ) {
645 $table_url = YOURLS_DB_TABLE_URL;
647 $totals = $ydb->get_row( "SELECT COUNT(keyword) as count, SUM(clicks) as sum FROM `$table_url` WHERE 1=1 $where" );
648 $return = array( 'total_links' => $totals->count, 'total_clicks' => $totals->sum );
650 return yourls_apply_filter( 'get_db_stats', $return, $where );
654 * Get number of SQL queries performed
657 function yourls_get_num_queries() {
660 return yourls_apply_filter( 'get_num_queries', $ydb->num_queries );
664 * Returns a sanitized a user agent string. Given what I found on http://www.user-agents.org/ it should be OK.
667 function yourls_get_user_agent() {
668 if ( !isset( $_SERVER['HTTP_USER_AGENT'] ) )
671 $ua = strip_tags( html_entity_decode( $_SERVER['HTTP_USER_AGENT'] ));
672 $ua = preg_replace('![^0-9a-zA-Z\':., /{}\(\)\[\]\+@&\!\?;_\-=~\*\#]!', '', $ua );
674 return yourls_apply_filter( 'get_user_agent', substr( $ua, 0, 254 ) );
678 * Redirect to another page
681 function yourls_redirect( $location, $code = 301 ) {
682 yourls_do_action( 'pre_redirect', $location, $code );
683 $location = yourls_apply_filter( 'redirect_location', $location, $code );
684 $code = yourls_apply_filter( 'redirect_code', $code, $location );
685 // Redirect, either properly if possible, or via Javascript otherwise
686 if( !headers_sent() ) {
687 yourls_status_header( $code );
688 header( "Location: $location" );
690 yourls_redirect_javascript( $location );
696 * Set HTTP status header
699 function yourls_status_header( $code = 200 ) {
703 $protocol = $_SERVER['SERVER_PROTOCOL'];
704 if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
705 $protocol = 'HTTP/1.0';
707 $code = intval( $code );
708 $desc = yourls_get_HTTP_status( $code );
710 @header ("$protocol $code $desc"); // This causes problems on IIS and some FastCGI setups
711 yourls_do_action( 'status_header', $code );
715 * Redirect to another page using Javascript. Set optional (bool)$dontwait to false to force manual redirection (make sure a message has been read by user)
718 function yourls_redirect_javascript( $location, $dontwait = true ) {
719 yourls_do_action( 'pre_redirect_javascript', $location, $dontwait );
720 $location = yourls_apply_filter( 'redirect_javascript', $location, $dontwait );
722 $message = yourls_s( 'if you are not redirected after 10 seconds, please <a href="%s">click here</a>', $location );
724 <script type="text/javascript">
725 window.location="$location";
727 <small>($message)</small>
730 echo '<p>' . yourls_s( 'Please <a href="%s">click here</a>', $location ) . '</p>';
732 yourls_do_action( 'post_redirect_javascript', $location );
736 * Return a HTTP status code
739 function yourls_get_HTTP_status( $code ) {
740 $code = intval( $code );
741 $headers_desc = array(
743 101 => 'Switching Protocols',
749 203 => 'Non-Authoritative Information',
751 205 => 'Reset Content',
752 206 => 'Partial Content',
753 207 => 'Multi-Status',
756 300 => 'Multiple Choices',
757 301 => 'Moved Permanently',
760 304 => 'Not Modified',
763 307 => 'Temporary Redirect',
765 400 => 'Bad Request',
766 401 => 'Unauthorized',
767 402 => 'Payment Required',
770 405 => 'Method Not Allowed',
771 406 => 'Not Acceptable',
772 407 => 'Proxy Authentication Required',
773 408 => 'Request Timeout',
776 411 => 'Length Required',
777 412 => 'Precondition Failed',
778 413 => 'Request Entity Too Large',
779 414 => 'Request-URI Too Long',
780 415 => 'Unsupported Media Type',
781 416 => 'Requested Range Not Satisfiable',
782 417 => 'Expectation Failed',
783 422 => 'Unprocessable Entity',
785 424 => 'Failed Dependency',
786 426 => 'Upgrade Required',
788 500 => 'Internal Server Error',
789 501 => 'Not Implemented',
790 502 => 'Bad Gateway',
791 503 => 'Service Unavailable',
792 504 => 'Gateway Timeout',
793 505 => 'HTTP Version Not Supported',
794 506 => 'Variant Also Negotiates',
795 507 => 'Insufficient Storage',
796 510 => 'Not Extended'
799 if ( isset( $headers_desc[$code] ) )
800 return $headers_desc[$code];
807 * Log a redirect (for stats)
810 function yourls_log_redirect( $keyword ) {
811 // Allow plugins to short-circuit the whole function
812 $pre = yourls_apply_filter( 'shunt_log_redirect', false, $keyword );
813 if ( false !== $pre )
816 if ( !yourls_do_log_redirect() )
820 $table = YOURLS_DB_TABLE_LOG;
822 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
823 $referrer = ( isset( $_SERVER['HTTP_REFERER'] ) ? yourls_escape( yourls_sanitize_url( $_SERVER['HTTP_REFERER'] ) ) : 'direct' );
824 $ua = yourls_escape( yourls_get_user_agent() );
825 $ip = yourls_escape( yourls_get_IP() );
826 $location = yourls_escape( yourls_geo_ip_to_countrycode( $ip ) );
828 return $ydb->query( "INSERT INTO `$table` (click_time, shorturl, referrer, user_agent, ip_address, country_code) VALUES (NOW(), '$keyword', '$referrer', '$ua', '$ip', '$location')" );
832 * Check if we want to not log redirects (for stats)
835 function yourls_do_log_redirect() {
836 return ( !defined( 'YOURLS_NOSTATS' ) || YOURLS_NOSTATS != true );
840 * Converts an IP to a 2 letter country code, using GeoIP database if available in includes/geo/
843 * @param string $ip IP or, if empty string, will be current user IP
844 * @param string $defaut Default string to return if IP doesn't resolve to a country (malformed, private IP...)
845 * @return string 2 letter country code (eg 'US') or $default
847 function yourls_geo_ip_to_countrycode( $ip = '', $default = '' ) {
848 // Allow plugins to short-circuit the Geo IP API
849 $location = yourls_apply_filter( 'shunt_geo_ip_to_countrycode', false, $ip, $default ); // at this point $ip can be '', check if your plugin hooks in here
850 if ( false !== $location )
854 $ip = yourls_get_IP();
856 // Use IPv4 or IPv6 DB & functions
857 if( false === filter_var( $ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6 ) ) {
859 $func = 'geoip_country_code_by_addr';
862 $func = 'geoip_country_code_by_addr_v6';
865 if ( !file_exists( YOURLS_INC . '/geo/' . $db ) || !file_exists( YOURLS_INC .'/geo/geoip.inc' ) )
868 require_once( YOURLS_INC . '/geo/geoip.inc' );
869 $gi = geoip_open( YOURLS_INC . '/geo/' . $db, GEOIP_STANDARD );
871 $location = call_user_func( $func, $gi, $ip );
872 } catch ( Exception $e ) {
877 if( '' == $location )
878 $location = $default;
880 return yourls_apply_filter( 'geo_ip_to_countrycode', $location, $ip, $default );
884 * Converts a 2 letter country code to long name (ie AU -> Australia)
887 function yourls_geo_countrycode_to_countryname( $code ) {
888 // Allow plugins to short-circuit the Geo IP API
889 $country = yourls_apply_filter( 'shunt_geo_countrycode_to_countryname', false, $code );
890 if ( false !== $country )
893 // Load the Geo class if not already done
894 if( !class_exists( 'GeoIP', false ) ) {
895 $temp = yourls_geo_ip_to_countrycode( '127.0.0.1' );
898 if( class_exists( 'GeoIP', false ) ) {
900 $id = $geo->GEOIP_COUNTRY_CODE_TO_NUMBER[ $code ];
901 $long = $geo->GEOIP_COUNTRY_NAMES[ $id ];
909 * Return flag URL from 2 letter country code
912 function yourls_geo_get_flag( $code ) {
913 if( file_exists( YOURLS_INC.'/geo/flags/flag_'.strtolower($code).'.gif' ) ) {
914 $img = yourls_match_current_protocol( YOURLS_SITE.'/includes/geo/flags/flag_'.( strtolower( $code ) ).'.gif' );
918 return yourls_apply_filter( 'geo_get_flag', $img, $code );
923 * Check if an upgrade is needed
926 function yourls_upgrade_is_needed() {
927 // check YOURLS_DB_VERSION exist && match values stored in YOURLS_DB_TABLE_OPTIONS
928 list( $currentver, $currentsql ) = yourls_get_current_version_from_sql();
929 if( $currentsql < YOURLS_DB_VERSION )
936 * Get current version & db version as stored in the options DB. Prior to 1.4 there's no option table.
939 function yourls_get_current_version_from_sql() {
940 $currentver = yourls_get_option( 'version' );
941 $currentsql = yourls_get_option( 'db_version' );
943 // Values if version is 1.3
949 return array( $currentver, $currentsql);
953 * Read an option from DB (or from cache if available). Return value or $default if not found
955 * Pretty much stolen from WordPress
958 * @param string $option Option name. Expected to not be SQL-escaped.
959 * @param mixed $default Optional value to return if option doesn't exist. Default false.
960 * @return mixed Value set for the option.
962 function yourls_get_option( $option_name, $default = false ) {
965 // Allow plugins to short-circuit options
966 $pre = yourls_apply_filter( 'shunt_option_'.$option_name, false );
967 if ( false !== $pre )
970 // If option not cached already, get its value from the DB
971 if ( !isset( $ydb->option[$option_name] ) ) {
972 $table = YOURLS_DB_TABLE_OPTIONS;
973 $option_name = yourls_escape( $option_name );
974 $row = $ydb->get_row( "SELECT `option_value` FROM `$table` WHERE `option_name` = '$option_name' LIMIT 1" );
975 if ( is_object( $row) ) { // Has to be get_row instead of get_var because of funkiness with 0, false, null values
976 $value = $row->option_value;
977 } else { // option does not exist, so we must cache its non-existence
980 $ydb->option[ $option_name ] = yourls_maybe_unserialize( $value );
983 return yourls_apply_filter( 'get_option_'.$option_name, $ydb->option[$option_name] );
987 * Read all options from DB at once
989 * The goal is to read all option at once and then populate array $ydb->option, to prevent further
990 * SQL queries if we need to read an option value later.
991 * It's also a simple check whether YOURLS is installed or not (no option = assuming not installed)
995 function yourls_get_all_options() {
998 // Allow plugins to short-circuit all options. (Note: regular plugins are loaded after all options)
999 $pre = yourls_apply_filter( 'shunt_all_options', false );
1000 if ( false !== $pre )
1003 $table = YOURLS_DB_TABLE_OPTIONS;
1005 $allopt = $ydb->get_results( "SELECT `option_name`, `option_value` FROM `$table` WHERE 1=1" );
1007 foreach( (array)$allopt as $option ) {
1008 $ydb->option[ $option->option_name ] = yourls_maybe_unserialize( $option->option_value );
1011 if( property_exists( $ydb, 'option' ) ) {
1012 $ydb->option = yourls_apply_filter( 'get_all_options', $ydb->option );
1013 $ydb->installed = true;
1015 // Zero option found: assume YOURLS is not installed
1016 $ydb->installed = false;
1021 * Update (add if doesn't exist) an option to DB
1023 * Pretty much stolen from WordPress
1026 * @param string $option Option name. Expected to not be SQL-escaped.
1027 * @param mixed $newvalue Option value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
1028 * @return bool False if value was not updated, true otherwise.
1030 function yourls_update_option( $option_name, $newvalue ) {
1032 $table = YOURLS_DB_TABLE_OPTIONS;
1034 $option_name = trim( $option_name );
1035 if ( empty( $option_name ) )
1038 // Use clone to break object refs -- see commit 09b989d375bac65e692277f61a84fede2fb04ae3
1039 if ( is_object( $newvalue ) )
1040 $newvalue = clone $newvalue;
1042 $option_name = yourls_escape( $option_name );
1044 $oldvalue = yourls_get_option( $option_name );
1046 // If the new and old values are the same, no need to update.
1047 if ( $newvalue === $oldvalue )
1050 if ( false === $oldvalue ) {
1051 yourls_add_option( $option_name, $newvalue );
1055 $_newvalue = yourls_escape( yourls_maybe_serialize( $newvalue ) );
1057 yourls_do_action( 'update_option', $option_name, $oldvalue, $newvalue );
1059 $ydb->query( "UPDATE `$table` SET `option_value` = '$_newvalue' WHERE `option_name` = '$option_name'" );
1061 if ( $ydb->rows_affected == 1 ) {
1062 $ydb->option[ $option_name ] = $newvalue;
1069 * Add an option to the DB
1071 * Pretty much stolen from WordPress
1074 * @param string $option Name of option to add. Expected to not be SQL-escaped.
1075 * @param mixed $value Optional option value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
1076 * @return bool False if option was not added and true otherwise.
1078 function yourls_add_option( $name, $value = '' ) {
1080 $table = YOURLS_DB_TABLE_OPTIONS;
1082 $name = trim( $name );
1083 if ( empty( $name ) )
1086 // Use clone to break object refs -- see commit 09b989d375bac65e692277f61a84fede2fb04ae3
1087 if ( is_object( $value ) )
1088 $value = clone $value;
1090 $name = yourls_escape( $name );
1092 // Make sure the option doesn't already exist
1093 if ( false !== yourls_get_option( $name ) )
1096 $_value = yourls_escape( yourls_maybe_serialize( $value ) );
1098 yourls_do_action( 'add_option', $name, $_value );
1100 $ydb->query( "INSERT INTO `$table` (`option_name`, `option_value`) VALUES ('$name', '$_value')" );
1101 $ydb->option[ $name ] = $value;
1107 * Delete an option from the DB
1109 * Pretty much stolen from WordPress
1112 * @param string $option Option name to delete. Expected to not be SQL-escaped.
1113 * @return bool True, if option is successfully deleted. False on failure.
1115 function yourls_delete_option( $name ) {
1117 $table = YOURLS_DB_TABLE_OPTIONS;
1118 $name = yourls_escape( $name );
1120 // Get the ID, if no ID then return
1121 $option = $ydb->get_row( "SELECT option_id FROM `$table` WHERE `option_name` = '$name'" );
1122 if ( is_null( $option ) || !$option->option_id )
1125 yourls_do_action( 'delete_option', $name );
1127 $ydb->query( "DELETE FROM `$table` WHERE `option_name` = '$name'" );
1128 unset( $ydb->option[ $name ] );
1134 * Serialize data if needed. Stolen from WordPress
1137 * @param mixed $data Data that might be serialized.
1138 * @return mixed A scalar data
1140 function yourls_maybe_serialize( $data ) {
1141 if ( is_array( $data ) || is_object( $data ) )
1142 return serialize( $data );
1144 if ( yourls_is_serialized( $data, false ) )
1145 return serialize( $data );
1151 * Check value to find if it was serialized. Stolen from WordPress
1154 * @param mixed $data Value to check to see if was serialized.
1155 * @param bool $strict Optional. Whether to be strict about the end of the string. Defaults true.
1156 * @return bool False if not serialized and true if it was.
1158 function yourls_is_serialized( $data, $strict = true ) {
1159 // if it isn't a string, it isn't serialized
1160 if ( ! is_string( $data ) )
1162 $data = trim( $data );
1163 if ( 'N;' == $data )
1165 $length = strlen( $data );
1168 if ( ':' !== $data[1] )
1171 $lastc = $data[ $length - 1 ];
1172 if ( ';' !== $lastc && '}' !== $lastc )
1175 $semicolon = strpos( $data, ';' );
1176 $brace = strpos( $data, '}' );
1177 // Either ; or } must exist.
1178 if ( false === $semicolon && false === $brace )
1180 // But neither must be in the first X characters.
1181 if ( false !== $semicolon && $semicolon < 3 )
1183 if ( false !== $brace && $brace < 4 )
1190 if ( '"' !== $data[ $length - 2 ] )
1192 } elseif ( false === strpos( $data, '"' ) ) {
1195 // or else fall through
1198 return (bool) preg_match( "/^{$token}:[0-9]+:/s", $data );
1202 $end = $strict ? '$' : '';
1203 return (bool) preg_match( "/^{$token}:[0-9.E-]+;$end/", $data );
1209 * Unserialize value only if it was serialized. Stolen from WP
1212 * @param string $original Maybe unserialized original, if is needed.
1213 * @return mixed Unserialized data can be any type.
1215 function yourls_maybe_unserialize( $original ) {
1216 if ( yourls_is_serialized( $original ) ) // don't attempt to unserialize data that wasn't serialized going in
1217 return @unserialize( $original );
1222 * Determine if the current page is private
1225 function yourls_is_private() {
1228 if ( defined('YOURLS_PRIVATE') && YOURLS_PRIVATE == true ) {
1230 // Allow overruling for particular pages:
1233 if( yourls_is_API() ) {
1234 if( !defined('YOURLS_PRIVATE_API') || YOURLS_PRIVATE_API != false )
1238 } elseif( yourls_is_infos() ) {
1239 if( !defined('YOURLS_PRIVATE_INFOS') || YOURLS_PRIVATE_INFOS !== false )
1249 return yourls_apply_filter( 'is_private', $private );
1253 * Show login form if required
1256 function yourls_maybe_require_auth() {
1257 if( yourls_is_private() ) {
1258 yourls_do_action( 'require_auth' );
1259 require_once( YOURLS_INC.'/auth.php' );
1261 yourls_do_action( 'require_no_auth' );
1266 * Allow several short URLs for the same long URL ?
1269 function yourls_allow_duplicate_longurls() {
1270 // special treatment if API to check for WordPress plugin requests
1271 if( yourls_is_API() ) {
1272 if ( isset($_REQUEST['source']) && $_REQUEST['source'] == 'plugin' )
1275 return ( defined( 'YOURLS_UNIQUE_URLS' ) && YOURLS_UNIQUE_URLS == false );
1279 * Return array of keywords that redirect to the submitted long URL
1282 * @param string $longurl long url
1283 * @param string $sort Optional ORDER BY order (can be 'keyword', 'title', 'timestamp' or'clicks')
1284 * @param string $order Optional SORT order (can be 'ASC' or 'DESC')
1285 * @return array array of keywords
1287 function yourls_get_longurl_keywords( $longurl, $sort = 'none', $order = 'ASC' ) {
1289 $longurl = yourls_escape( yourls_sanitize_url( $longurl ) );
1290 $table = YOURLS_DB_TABLE_URL;
1291 $query = "SELECT `keyword` FROM `$table` WHERE `url` = '$longurl'";
1293 // Ensure sort is a column in database (@TODO: update verification array if database changes)
1294 if ( in_array( $sort, array('keyword','title','timestamp','clicks') ) ) {
1295 $query .= " ORDER BY '".$sort."'";
1296 if ( in_array( $order, array( 'ASC','DESC' ) ) ) {
1297 $query .= " ".$order;
1300 return yourls_apply_filter( 'get_longurl_keywords', $ydb->get_col( $query ), $longurl );
1304 * Check if an IP shortens URL too fast to prevent DB flood. Return true, or die.
1307 function yourls_check_IP_flood( $ip = '' ) {
1309 // Allow plugins to short-circuit the whole function
1310 $pre = yourls_apply_filter( 'shunt_check_IP_flood', false, $ip );
1311 if ( false !== $pre )
1314 yourls_do_action( 'pre_check_ip_flood', $ip ); // at this point $ip can be '', check it if your plugin hooks in here
1316 // Raise white flag if installing or if no flood delay defined
1318 ( defined('YOURLS_FLOOD_DELAY_SECONDS') && YOURLS_FLOOD_DELAY_SECONDS === 0 ) ||
1319 !defined('YOURLS_FLOOD_DELAY_SECONDS') ||
1320 yourls_is_installing()
1324 // Don't throttle logged in users
1325 if( yourls_is_private() ) {
1326 if( yourls_is_valid_user() === true )
1330 // Don't throttle whitelist IPs
1331 if( defined( 'YOURLS_FLOOD_IP_WHITELIST' ) && YOURLS_FLOOD_IP_WHITELIST ) {
1332 $whitelist_ips = explode( ',', YOURLS_FLOOD_IP_WHITELIST );
1333 foreach( (array)$whitelist_ips as $whitelist_ip ) {
1334 $whitelist_ip = trim( $whitelist_ip );
1335 if ( $whitelist_ip == $ip )
1340 $ip = ( $ip ? yourls_sanitize_ip( $ip ) : yourls_get_IP() );
1341 $ip = yourls_escape( $ip );
1343 yourls_do_action( 'check_ip_flood', $ip );
1346 $table = YOURLS_DB_TABLE_URL;
1348 $lasttime = $ydb->get_var( "SELECT `timestamp` FROM $table WHERE `ip` = '$ip' ORDER BY `timestamp` DESC LIMIT 1" );
1351 $then = date( 'U', strtotime( $lasttime ) );
1352 if( ( $now - $then ) <= YOURLS_FLOOD_DELAY_SECONDS ) {
1354 yourls_do_action( 'ip_flood', $ip, $now - $then );
1355 yourls_die( yourls__( 'Too many URLs added too fast. Slow down please.' ), yourls__( 'Forbidden' ), 403 );
1363 * Check if YOURLS is installing
1368 function yourls_is_installing() {
1369 $installing = defined( 'YOURLS_INSTALLING' ) && YOURLS_INSTALLING == true;
1370 return yourls_apply_filter( 'is_installing', $installing );
1374 * Check if YOURLS is upgrading
1379 function yourls_is_upgrading() {
1380 $upgrading = defined( 'YOURLS_UPGRADING' ) && YOURLS_UPGRADING == true;
1381 return yourls_apply_filter( 'is_upgrading', $upgrading );
1386 * Check if YOURLS is installed
1388 * Checks property $ydb->installed that is created by yourls_get_all_options()
1390 * See inline comment for updating from 1.3 or prior.
1393 function yourls_is_installed() {
1395 $is_installed = ( property_exists( $ydb, 'installed' ) && $ydb->installed == true );
1396 return yourls_apply_filter( 'is_installed', $is_installed );
1398 /* Note: this test won't work on YOURLS 1.3 or older (Aug 2009...)
1399 Should someone complain that they cannot upgrade directly from
1400 1.3 to 1.7: first, laugh at them, then ask them to install 1.6 first.
1405 * Generate random string of (int)$length length and type $type (see function for details)
1408 function yourls_rnd_string ( $length = 5, $type = 0, $charlist = '' ) {
1410 $length = intval( $length );
1412 // define possible characters
1415 // custom char list, or comply to charset as defined in config
1417 $possible = $charlist ? $charlist : yourls_get_shorturl_charset() ;
1420 // no vowels to make no offending word, no 0/1/o/l to avoid confusion between letters & digits. Perfect for passwords.
1422 $possible = "23456789bcdfghjkmnpqrstvwxyz";
1425 // Same, with lower + upper
1427 $possible = "23456789bcdfghjkmnpqrstvwxyzBCDFGHJKMNPQRSTVWXYZ";
1430 // all letters, lowercase
1432 $possible = "abcdefghijklmnopqrstuvwxyz";
1435 // all letters, lowercase + uppercase
1437 $possible = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1440 // all digits & letters lowercase
1442 $possible = "0123456789abcdefghijklmnopqrstuvwxyz";
1445 // all digits & letters lowercase + uppercase
1447 $possible = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1452 $str = substr( str_shuffle( $possible ), 0, $length );
1454 return yourls_apply_filter( 'rnd_string', $str, $length, $type, $charlist );
1458 * Return salted string
1461 function yourls_salt( $string ) {
1462 $salt = defined('YOURLS_COOKIEKEY') ? YOURLS_COOKIEKEY : md5(__FILE__) ;
1463 return yourls_apply_filter( 'yourls_salt', md5 ($string . $salt), $string );
1467 * Add a query var to a URL and return URL. Completely stolen from WP.
1469 * Works with one of these parameter patterns:
1470 * array( 'var' => 'value' )
1471 * array( 'var' => 'value' ), $url
1473 * 'var', 'value', $url
1474 * If $url omitted, uses $_SERVER['REQUEST_URI']
1477 function yourls_add_query_arg() {
1479 if ( is_array( func_get_arg(0) ) ) {
1480 if ( @func_num_args() < 2 || false === @func_get_arg( 1 ) )
1481 $uri = $_SERVER['REQUEST_URI'];
1483 $uri = @func_get_arg( 1 );
1485 if ( @func_num_args() < 3 || false === @func_get_arg( 2 ) )
1486 $uri = $_SERVER['REQUEST_URI'];
1488 $uri = @func_get_arg( 2 );
1491 $uri = str_replace( '&', '&', $uri );
1494 if ( $frag = strstr( $uri, '#' ) )
1495 $uri = substr( $uri, 0, -strlen( $frag ) );
1499 if ( preg_match( '|^https?://|i', $uri, $matches ) ) {
1500 $protocol = $matches[0];
1501 $uri = substr( $uri, strlen( $protocol ) );
1506 if ( strpos( $uri, '?' ) !== false ) {
1507 $parts = explode( '?', $uri, 2 );
1508 if ( 1 == count( $parts ) ) {
1512 $base = $parts[0] . '?';
1515 } elseif ( !empty( $protocol ) || strpos( $uri, '=' ) === false ) {
1523 parse_str( $query, $qs );
1524 $qs = yourls_urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
1525 if ( is_array( func_get_arg( 0 ) ) ) {
1526 $kayvees = func_get_arg( 0 );
1527 $qs = array_merge( $qs, $kayvees );
1529 $qs[func_get_arg( 0 )] = func_get_arg( 1 );
1532 foreach ( (array) $qs as $k => $v ) {
1537 $ret = http_build_query( $qs );
1538 $ret = trim( $ret, '?' );
1539 $ret = preg_replace( '#=(&|$)#', '$1', $ret );
1540 $ret = $protocol . $base . $ret . $frag;
1541 $ret = rtrim( $ret, '?' );
1546 * Navigates through an array and encodes the values to be used in a URL. Stolen from WP, used in yourls_add_query_arg()
1549 function yourls_urlencode_deep( $value ) {
1550 $value = is_array( $value ) ? array_map( 'yourls_urlencode_deep', $value ) : urlencode( $value );
1555 * Remove arg from query. Opposite of yourls_add_query_arg. Stolen from WP.
1558 function yourls_remove_query_arg( $key, $query = false ) {
1559 if ( is_array( $key ) ) { // removing multiple keys
1560 foreach ( $key as $k )
1561 $query = yourls_add_query_arg( $k, false, $query );
1564 return yourls_add_query_arg( $key, false, $query );
1568 * Return a time-dependent string for nonce creation
1571 function yourls_tick() {
1572 return ceil( time() / YOURLS_NONCE_LIFE );
1576 * Create a time limited, action limited and user limited token
1579 function yourls_create_nonce( $action, $user = false ) {
1580 if( false == $user )
1581 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1582 $tick = yourls_tick();
1583 return substr( yourls_salt($tick . $action . $user), 0, 10 );
1587 * Create a nonce field for inclusion into a form
1590 function yourls_nonce_field( $action, $name = 'nonce', $user = false, $echo = true ) {
1591 $field = '<input type="hidden" id="'.$name.'" name="'.$name.'" value="'.yourls_create_nonce( $action, $user ).'" />';
1598 * Add a nonce to a URL. If URL omitted, adds nonce to current URL
1601 function yourls_nonce_url( $action, $url = false, $name = 'nonce', $user = false ) {
1602 $nonce = yourls_create_nonce( $action, $user );
1603 return yourls_add_query_arg( $name, $nonce, $url );
1607 * Check validity of a nonce (ie time span, user and action match).
1609 * Returns true if valid, dies otherwise (yourls_die() or die($return) if defined)
1610 * if $nonce is false or unspecified, it will use $_REQUEST['nonce']
1613 function yourls_verify_nonce( $action, $nonce = false, $user = false, $return = '' ) {
1615 if( false == $user )
1616 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1618 // get current nonce value
1619 if( false == $nonce && isset( $_REQUEST['nonce'] ) )
1620 $nonce = $_REQUEST['nonce'];
1622 // what nonce should be
1623 $valid = yourls_create_nonce( $action, $user );
1625 if( $nonce == $valid ) {
1630 yourls_die( yourls__( 'Unauthorized action or expired link' ), yourls__( 'Error' ), 403 );
1635 * Converts keyword into short link (prepend with YOURLS base URL)
1638 function yourls_link( $keyword = '' ) {
1639 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword );
1640 return yourls_apply_filter( 'yourls_link', $link, $keyword );
1644 * Converts keyword into stat link (prepend with YOURLS base URL, append +)
1647 function yourls_statlink( $keyword = '' ) {
1648 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword ) . '+';
1649 if( yourls_is_ssl() )
1650 $link = yourls_set_url_scheme( $link, 'https' );
1651 return yourls_apply_filter( 'yourls_statlink', $link, $keyword );
1655 * Check if we'll need interface display function (ie not API or redirection)
1658 function yourls_has_interface() {
1659 if( yourls_is_API() or yourls_is_GO() )
1665 * Check if we're in API mode. Returns bool
1668 function yourls_is_API() {
1669 if ( defined( 'YOURLS_API' ) && YOURLS_API == true )
1675 * Check if we're in Ajax mode. Returns bool
1678 function yourls_is_Ajax() {
1679 if ( defined( 'YOURLS_AJAX' ) && YOURLS_AJAX == true )
1685 * Check if we're in GO mode (yourls-go.php). Returns bool
1688 function yourls_is_GO() {
1689 if ( defined( 'YOURLS_GO' ) && YOURLS_GO == true )
1695 * Check if we're displaying stats infos (yourls-infos.php). Returns bool
1698 function yourls_is_infos() {
1699 if ( defined( 'YOURLS_INFOS' ) && YOURLS_INFOS == true )
1705 * Check if we're in the admin area. Returns bool
1708 function yourls_is_admin() {
1709 if ( defined( 'YOURLS_ADMIN' ) && YOURLS_ADMIN == true )
1715 * Check if the server seems to be running on Windows. Not exactly sure how reliable this is.
1718 function yourls_is_windows() {
1719 return defined( 'DIRECTORY_SEPARATOR' ) && DIRECTORY_SEPARATOR == '\\';
1723 * Check if SSL is required. Returns bool.
1726 function yourls_needs_ssl() {
1727 if ( defined('YOURLS_ADMIN_SSL') && YOURLS_ADMIN_SSL == true )
1733 * Return admin link, with SSL preference if applicable.
1736 function yourls_admin_url( $page = '' ) {
1737 $admin = YOURLS_SITE . '/admin/' . $page;
1738 if( yourls_is_ssl() or yourls_needs_ssl() )
1739 $admin = yourls_set_url_scheme( $admin, 'https' );
1740 return yourls_apply_filter( 'admin_url', $admin, $page );
1744 * Return YOURLS_SITE or URL under YOURLS setup, with SSL preference
1747 function yourls_site_url( $echo = true, $url = '' ) {
1748 $url = yourls_get_relative_url( $url );
1749 $url = trim( YOURLS_SITE . '/' . $url, '/' );
1751 // Do not enforce (checking yourls_need_ssl() ) but check current usage so it won't force SSL on non-admin pages
1752 if( yourls_is_ssl() )
1753 $url = yourls_set_url_scheme( $url, 'https' );
1754 $url = yourls_apply_filter( 'site_url', $url );
1761 * Check if SSL is used, returns bool. Stolen from WP.
1764 function yourls_is_ssl() {
1766 if ( isset( $_SERVER['HTTPS'] ) ) {
1767 if ( 'on' == strtolower( $_SERVER['HTTPS'] ) )
1769 if ( '1' == $_SERVER['HTTPS'] )
1771 } elseif ( isset( $_SERVER['SERVER_PORT'] ) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
1774 return yourls_apply_filter( 'is_ssl', $is_ssl );
1778 * Get a remote page title
1780 * This function returns a string: either the page title as defined in HTML, or the URL if not found
1781 * The function tries to convert funky characters found in titles to UTF8, from the detected charset.
1782 * Charset in use is guessed from HTML meta tag, or if not found, from server's 'content-type' response.
1784 * @param string $url URL
1785 * @return string Title (sanitized) or the URL if no title found
1787 function yourls_get_remote_title( $url ) {
1788 // Allow plugins to short-circuit the whole function
1789 $pre = yourls_apply_filter( 'shunt_get_remote_title', false, $url );
1790 if ( false !== $pre )
1793 $url = yourls_sanitize_url( $url );
1795 // Only deal with http(s)://
1796 if( !in_array( yourls_get_protocol( $url ), array( 'http://', 'https://' ) ) )
1799 $title = $charset = false;
1801 $response = yourls_http_get( $url ); // can be a Request object or an error string
1802 if( is_string( $response ) ) {
1806 // Page content. No content? Return the URL
1807 $content = $response->body;
1811 // look for <title>. No title found? Return the URL
1812 if ( preg_match('/<title>(.*?)<\/title>/is', $content, $found ) ) {
1819 // Now we have a title. We'll try to get proper utf8 from it.
1821 // Get charset as (and if) defined by the HTML meta tag. We should match
1822 // <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
1823 // or <meta charset='utf-8'> and all possible variations: see https://gist.github.com/ozh/7951236
1824 if ( preg_match( '/<meta[^>]*charset\s*=["\' ]*([a-zA-Z0-9\-_]+)/is', $content, $found ) ) {
1825 $charset = $found[1];
1828 // No charset found in HTML. Get charset as (and if) defined by the server response
1829 $_charset = current( $response->headers->getValues( 'content-type' ) );
1830 if( preg_match( '/charset=(\S+)/', $_charset, $found ) ) {
1831 $charset = trim( $found[1], ';' );
1836 // Conversion to utf-8 if what we have is not utf8 already
1837 if( strtolower( $charset ) != 'utf-8' && function_exists( 'mb_convert_encoding' ) ) {
1838 // We use @ to remove warnings because mb_ functions are easily bitching about illegal chars
1840 $title = @mb_convert_encoding( $title, 'UTF-8', $charset );
1842 $title = @mb_convert_encoding( $title, 'UTF-8' );
1846 // Remove HTML entities
1847 $title = html_entity_decode( $title, ENT_QUOTES, 'UTF-8' );
1849 // Strip out evil things
1850 $title = yourls_sanitize_title( $title );
1852 return yourls_apply_filter( 'get_remote_title', $title, $url );
1856 * Quick UA check for mobile devices. Return boolean.
1859 function yourls_is_mobile_device() {
1862 'android', 'blackberry', 'blazer',
1863 'compal', 'elaine', 'fennec', 'hiptop',
1864 'iemobile', 'iphone', 'ipod', 'ipad',
1865 'iris', 'kindle', 'opera mobi', 'opera mini',
1866 'palm', 'phone', 'pocket', 'psp', 'symbian',
1867 'treo', 'wap', 'windows ce', 'windows phone'
1870 // Current user-agent
1871 $current = strtolower( $_SERVER['HTTP_USER_AGENT'] );
1874 $is_mobile = ( str_replace( $mobiles, '', $current ) != $current );
1875 return yourls_apply_filter( 'is_mobile_device', $is_mobile );
1879 * Get request in YOURLS base (eg in 'http://site.com/yourls/abcd' get 'abdc')
1882 function yourls_get_request() {
1883 // Allow plugins to short-circuit the whole function
1884 $pre = yourls_apply_filter( 'shunt_get_request', false );
1885 if ( false !== $pre )
1888 static $request = null;
1890 yourls_do_action( 'pre_get_request', $request );
1892 if( $request !== null )
1895 // Ignore protocol & www. prefix
1896 $root = str_replace( array( 'https://', 'http://', 'https://www.', 'http://www.' ), '', YOURLS_SITE );
1897 // Case insensitive comparison of the YOURLS root to match both http://Sho.rt/blah and http://sho.rt/blah
1898 $request = preg_replace( "!$root/!i", '', $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 1 );
1900 // Unless request looks like a full URL (ie request is a simple keyword) strip query string
1901 if( !preg_match( "@^[a-zA-Z]+://.+@", $request ) ) {
1902 $request = current( explode( '?', $request ) );
1905 return yourls_apply_filter( 'get_request', $request );
1909 * Change protocol to match current scheme used (http or https)
1912 function yourls_match_current_protocol( $url, $normal = 'http://', $ssl = 'https://' ) {
1913 if( yourls_is_ssl() )
1914 $url = str_replace( $normal, $ssl, $url );
1915 return yourls_apply_filter( 'match_current_protocol', $url );
1919 * Fix $_SERVER['REQUEST_URI'] variable for various setups. Stolen from WP.
1922 function yourls_fix_request_uri() {
1924 $default_server_values = array(
1925 'SERVER_SOFTWARE' => '',
1926 'REQUEST_URI' => '',
1928 $_SERVER = array_merge( $default_server_values, $_SERVER );
1930 // Fix for IIS when running with PHP ISAPI
1931 if ( empty( $_SERVER['REQUEST_URI'] ) || ( php_sapi_name() != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
1934 if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
1935 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
1937 // IIS Isapi_Rewrite
1938 else if ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
1939 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
1941 // Use ORIG_PATH_INFO if there is no PATH_INFO
1942 if ( !isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) )
1943 $_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
1945 // Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
1946 if ( isset( $_SERVER['PATH_INFO'] ) ) {
1947 if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
1948 $_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
1950 $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
1953 // Append the query string if it exists and isn't null
1954 if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
1955 $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
1962 * Shutdown function, runs just before PHP shuts down execution. Stolen from WP
1965 function yourls_shutdown() {
1966 yourls_do_action( 'shutdown' );
1970 * Auto detect custom favicon in /user directory, fallback to YOURLS favicon, and echo/return its URL
1973 function yourls_favicon( $echo = true ) {
1974 static $favicon = null;
1975 if( $favicon !== null )
1979 // search for favicon.(gif|ico|png|jpg|svg)
1980 foreach( array( 'gif', 'ico', 'png', 'jpg', 'svg' ) as $ext ) {
1981 if( file_exists( YOURLS_USERDIR. '/favicon.' . $ext ) ) {
1982 $custom = 'favicon.' . $ext;
1988 $favicon = yourls_site_url( false, YOURLS_USERURL . '/' . $custom );
1990 $favicon = yourls_site_url( false ) . '/images/favicon.gif';
1998 * Check for maintenance mode. If yes, die. See yourls_maintenance_mode(). Stolen from WP.
2001 function yourls_check_maintenance_mode() {
2003 $file = YOURLS_ABSPATH . '/.maintenance' ;
2004 if ( !file_exists( $file ) || yourls_is_upgrading() || yourls_is_installing() )
2007 global $maintenance_start;
2009 include_once( $file );
2010 // If the $maintenance_start timestamp is older than 10 minutes, don't die.
2011 if ( ( time() - $maintenance_start ) >= 600 )
2014 // Use any /user/maintenance.php file
2015 if( file_exists( YOURLS_USERDIR.'/maintenance.php' ) ) {
2016 include_once( YOURLS_USERDIR.'/maintenance.php' );
2020 // https://www.youtube.com/watch?v=Xw-m4jEY-Ns
2021 $title = yourls__( 'Service temporarily unavailable' );
2022 $message = yourls__( 'Our service is currently undergoing scheduled maintenance.' ) . "</p>\n<p>" .
2023 yourls__( 'Things should not last very long, thank you for your patience and please excuse the inconvenience' );
2024 yourls_die( $message, $title , 503 );
2029 * Return current admin page, or null if not an admin page
2031 * @return mixed string if admin page, null if not an admin page
2034 function yourls_current_admin_page() {
2035 if( yourls_is_admin() ) {
2036 $current = substr( yourls_get_request(), 6 );
2037 if( $current === false )
2038 $current = 'index.php'; // if current page is http://sho.rt/admin/ instead of http://sho.rt/admin/index.php
2046 * Check if a URL protocol is allowed
2048 * Checks a URL against a list of whitelisted protocols. Protocols must be defined with
2049 * their complete scheme name, ie 'stuff:' or 'stuff://' (for instance, 'mailto:' is a valid
2050 * protocol, 'mailto://' isn't, and 'http:' with no double slashed isn't either
2054 * @param string $url URL to be check
2055 * @param array $protocols Optional. Array of protocols, defaults to global $yourls_allowedprotocols
2056 * @return boolean true if protocol allowed, false otherwise
2058 function yourls_is_allowed_protocol( $url, $protocols = array() ) {
2059 if( ! $protocols ) {
2060 global $yourls_allowedprotocols;
2061 $protocols = $yourls_allowedprotocols;
2064 $protocol = yourls_get_protocol( $url );
2065 return yourls_apply_filter( 'is_allowed_protocol', in_array( $protocol, $protocols ), $url, $protocols );
2069 * Get protocol from a URL (eg mailto:, http:// ...)
2073 * @param string $url URL to be check
2074 * @return string Protocol, with slash slash if applicable. Empty string if no protocol
2076 function yourls_get_protocol( $url ) {
2077 preg_match( '!^[a-zA-Z0-9\+\.-]+:(//)?!', $url, $matches );
2079 http://en.wikipedia.org/wiki/URI_scheme#Generic_syntax
2080 The scheme name consists of a sequence of characters beginning with a letter and followed by any
2081 combination of letters, digits, plus ("+"), period ("."), or hyphen ("-"). Although schemes are
2082 case-insensitive, the canonical form is lowercase and documents that specify schemes must do so
2083 with lowercase letters. It is followed by a colon (":").
2085 $protocol = ( isset( $matches[0] ) ? $matches[0] : '' );
2086 return yourls_apply_filter( 'get_protocol', $protocol, $url );
2090 * Get relative URL (eg 'abc' from 'http://sho.rt/abc')
2092 * Treat indifferently http & https. If a URL isn't relative to the YOURLS install, return it as is
2093 * or return empty string if $strict is true
2096 * @param string $url URL to relativize
2097 * @param bool $strict if true and if URL isn't relative to YOURLS install, return empty string
2098 * @return string URL
2100 function yourls_get_relative_url( $url, $strict = true ) {
2101 $url = yourls_sanitize_url( $url );
2103 // Remove protocols to make it easier
2104 $noproto_url = str_replace( 'https:', 'http:', $url );
2105 $noproto_site = str_replace( 'https:', 'http:', YOURLS_SITE );
2107 // Trim URL from YOURLS root URL : if no modification made, URL wasn't relative
2108 $_url = str_replace( $noproto_site . '/', '', $noproto_url );
2109 if( $_url == $noproto_url )
2110 $_url = ( $strict ? '' : $url );
2112 return yourls_apply_filter( 'get_relative_url', $_url, $url );
2116 * Marks a function as deprecated and informs when it has been used. Stolen from WP.
2118 * There is a hook deprecated_function that will be called that can be used
2119 * to get the backtrace up to what file and function called the deprecated
2122 * The current behavior is to trigger a user error if YOURLS_DEBUG is true.
2124 * This function is to be used in every function that is deprecated.
2127 * @uses yourls_do_action() Calls 'deprecated_function' and passes the function name, what to use instead,
2128 * and the version the function was deprecated in.
2129 * @uses yourls_apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do
2130 * trigger or false to not trigger error.
2132 * @param string $function The function that was called
2133 * @param string $version The version of WordPress that deprecated the function
2134 * @param string $replacement Optional. The function that should have been called
2136 function yourls_deprecated_function( $function, $version, $replacement = null ) {
2138 yourls_do_action( 'deprecated_function', $function, $replacement, $version );
2140 // Allow plugin to filter the output error trigger
2141 if ( YOURLS_DEBUG && yourls_apply_filters( 'deprecated_function_trigger_error', true ) ) {
2142 if ( ! is_null( $replacement ) )
2143 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) );
2145 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
2150 * Return the value if not an empty string
2152 * Used with array_filter(), to remove empty keys but not keys with value 0 or false
2155 * @param mixed $val Value to test against ''
2156 * @return bool True if not an empty string
2158 function yourls_return_if_not_empty_string( $val ) {
2159 return( $val !== '' );
2163 * Add a message to the debug log
2165 * When in debug mode ( YOURLS_DEBUG == true ) the debug log is echoed in yourls_html_footer()
2166 * Log messages are appended to $ydb->debug_log array, which is instanciated within class ezSQLcore_YOURLS
2169 * @param string $msg Message to add to the debug log
2170 * @return string The message itself
2172 function yourls_debug_log( $msg ) {
2174 $ydb->debug_log[] = $msg;
2179 * Explode a URL in an array of ( 'protocol' , 'slashes if any', 'rest of the URL' )
2181 * Some hosts trip up when a query string contains 'http://' - see http://git.io/j1FlJg
2182 * The idea is that instead of passing the whole URL to a bookmarklet, eg index.php?u=http://blah.com,
2183 * we pass it by pieces to fool the server, eg index.php?proto=http:&slashes=//&rest=blah.com
2185 * Known limitation: this won't work if the rest of the URL itself contains 'http://', for example
2186 * if rest = blah.com/file.php?url=http://foo.com
2190 * with 'mailto:jsmith@example.com?subject=hey' :
2191 * array( 'protocol' => 'mailto:', 'slashes' => '', 'rest' => 'jsmith@example.com?subject=hey' )
2193 * with 'http://example.com/blah.html' :
2194 * array( 'protocol' => 'http:', 'slashes' => '//', 'rest' => 'example.com/blah.html' )
2197 * @param string $url URL to be parsed
2198 * @param array $array Optional, array of key names to be used in returned array
2199 * @return mixed false if no protocol found, array of ('protocol' , 'slashes', 'rest') otherwise
2201 function yourls_get_protocol_slashes_and_rest( $url, $array = array( 'protocol', 'slashes', 'rest' ) ) {
2202 $proto = yourls_get_protocol( $url );
2204 if( !$proto or count( $array ) != 3 )
2207 list( $null, $rest ) = explode( $proto, $url, 2 );
2209 list( $proto, $slashes ) = explode( ':', $proto );
2211 return array( $array[0] => $proto . ':', $array[1] => $slashes, $array[2] => $rest );
2215 * Set URL scheme (to HTTP or HTTPS)
2218 * @param string $url URL
2219 * @param string $scheme scheme, either 'http' or 'https'
2220 * @return string URL with chosen scheme
2222 function yourls_set_url_scheme( $url, $scheme = false ) {
2223 if( $scheme != 'http' && $scheme != 'https' ) {
2226 return preg_replace( '!^[a-zA-Z0-9\+\.-]+://!', $scheme . '://', $url );