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 $shorturl = YOURLS_SITE .'/'. $url_exists->keyword;
292 $return['status'] = 'fail';
293 $return['code'] = 'error:url';
294 $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 );
295 $return['message'] = /* //translators: eg "http://someurl/ already exists" */ yourls_s( '%s already exists in database', yourls_trim_long_string( $strip_url ) ) . " (<a href='$shorturl'>$shorturl</a>)";
296 $return['title'] = $url_exists->title;
297 $return['shorturl'] = $shorturl;
300 yourls_do_action( 'post_add_new_link', $url, $keyword, $title );
302 $return['statusCode'] = 200; // regardless of result, this is still a valid request
303 return yourls_apply_filter( 'add_new_link', $return, $url, $keyword, $title );
311 function yourls_edit_link( $url, $keyword, $newkeyword='', $title='' ) {
312 // Allow plugins to short-circuit the whole function
313 $pre = yourls_apply_filter( 'shunt_edit_link', null, $keyword, $url, $keyword, $newkeyword, $title );
319 $table = YOURLS_DB_TABLE_URL;
320 $url = yourls_escape (yourls_sanitize_url( $url ) );
321 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
322 $title = yourls_escape( yourls_sanitize_title( $title ) );
323 $newkeyword = yourls_escape( yourls_sanitize_string( $newkeyword ) );
324 $strip_url = stripslashes( $url );
325 $strip_title = stripslashes( $title );
326 $old_url = $ydb->get_var( "SELECT `url` FROM `$table` WHERE `keyword` = '$keyword';" );
328 // Check if new URL is not here already
329 if ( $old_url != $url && !yourls_allow_duplicate_longurls() ) {
330 $new_url_already_there = intval($ydb->get_var("SELECT COUNT(keyword) FROM `$table` WHERE `url` = '$url';"));
332 $new_url_already_there = false;
335 // Check if the new keyword is not here already
336 if ( $newkeyword != $keyword ) {
337 $keyword_is_ok = yourls_keyword_is_free( $newkeyword );
339 $keyword_is_ok = true;
342 yourls_do_action( 'pre_edit_link', $url, $keyword, $newkeyword, $new_url_already_there, $keyword_is_ok );
345 if ( ( !$new_url_already_there || yourls_allow_duplicate_longurls() ) && $keyword_is_ok ) {
346 $update_url = $ydb->query( "UPDATE `$table` SET `url` = '$url', `keyword` = '$newkeyword', `title` = '$title' WHERE `keyword` = '$keyword';" );
348 $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 ) );
349 $return['status'] = 'success';
350 $return['message'] = yourls__( 'Link updated in database' );
352 $return['status'] = 'fail';
353 $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 ) ;
358 $return['status'] = 'fail';
359 $return['message'] = yourls__( 'URL or keyword already exists in database' );
362 return yourls_apply_filter( 'edit_link', $return, $url, $keyword, $newkeyword, $title, $new_url_already_there, $keyword_is_ok );
366 * Update a title link (no checks for duplicates etc..)
369 function yourls_edit_link_title( $keyword, $title ) {
370 // Allow plugins to short-circuit the whole function
371 $pre = yourls_apply_filter( 'shunt_edit_link_title', null, $keyword, $title );
377 $keyword = yourls_escape( yourls_sanitize_keyword( $keyword ) );
378 $title = yourls_escape( yourls_sanitize_title( $title ) );
380 $table = YOURLS_DB_TABLE_URL;
381 $update = $ydb->query("UPDATE `$table` SET `title` = '$title' WHERE `keyword` = '$keyword';");
388 * Check if keyword id is free (ie not already taken, and not reserved). Return bool.
391 function yourls_keyword_is_free( $keyword ) {
393 if ( yourls_keyword_is_reserved( $keyword ) or yourls_keyword_is_taken( $keyword ) )
396 return yourls_apply_filter( 'keyword_is_free', $free, $keyword );
400 * Check if a keyword is taken (ie there is already a short URL with this id). Return bool.
403 function yourls_keyword_is_taken( $keyword ) {
405 // Allow plugins to short-circuit the whole function
406 $pre = yourls_apply_filter( 'shunt_keyword_is_taken', false, $keyword );
407 if ( false !== $pre )
411 $keyword = yourls_escape( yourls_sanitize_keyword( $keyword ) );
413 $table = YOURLS_DB_TABLE_URL;
414 $already_exists = $ydb->get_var( "SELECT COUNT(`keyword`) FROM `$table` WHERE `keyword` = '$keyword';" );
415 if ( $already_exists )
418 return yourls_apply_filter( 'keyword_is_taken', $taken, $keyword );
425 function yourls_xml_encode( $array ) {
426 require_once( YOURLS_INC.'/functions-xml.php' );
427 $converter= new yourls_array2xml;
428 return $converter->array2xml( $array );
432 * 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
435 function yourls_get_keyword_infos( $keyword, $use_cache = true ) {
437 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
439 yourls_do_action( 'pre_get_keyword', $keyword, $use_cache );
441 if( isset( $ydb->infos[$keyword] ) && $use_cache == true ) {
442 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
445 yourls_do_action( 'get_keyword_not_cached', $keyword );
447 $table = YOURLS_DB_TABLE_URL;
448 $infos = $ydb->get_row( "SELECT * FROM `$table` WHERE `keyword` = '$keyword'" );
451 $infos = (array)$infos;
452 $ydb->infos[ $keyword ] = $infos;
454 $ydb->infos[ $keyword ] = false;
457 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
461 * Return (string) selected information associated with a keyword. Optional $notfound = string default message if nothing found
464 function yourls_get_keyword_info( $keyword, $field, $notfound = false ) {
466 // Allow plugins to short-circuit the whole function
467 $pre = yourls_apply_filter( 'shunt_get_keyword_info', false, $keyword, $field, $notfound );
468 if ( false !== $pre )
471 $keyword = yourls_sanitize_string( $keyword );
472 $infos = yourls_get_keyword_infos( $keyword );
475 if ( isset( $infos[ $field ] ) && $infos[ $field ] !== false )
476 $return = $infos[ $field ];
478 return yourls_apply_filter( 'get_keyword_info', $return, $keyword, $field, $notfound );
482 * Return title associated with keyword. Optional $notfound = string default message if nothing found
485 function yourls_get_keyword_title( $keyword, $notfound = false ) {
486 return yourls_get_keyword_info( $keyword, 'title', $notfound );
490 * Return long URL associated with keyword. Optional $notfound = string default message if nothing found
493 function yourls_get_keyword_longurl( $keyword, $notfound = false ) {
494 return yourls_get_keyword_info( $keyword, 'url', $notfound );
498 * Return number of clicks on a keyword. Optional $notfound = string default message if nothing found
501 function yourls_get_keyword_clicks( $keyword, $notfound = false ) {
502 return yourls_get_keyword_info( $keyword, 'clicks', $notfound );
506 * Return IP that added a keyword. Optional $notfound = string default message if nothing found
509 function yourls_get_keyword_IP( $keyword, $notfound = false ) {
510 return yourls_get_keyword_info( $keyword, 'ip', $notfound );
514 * Return timestamp associated with a keyword. Optional $notfound = string default message if nothing found
517 function yourls_get_keyword_timestamp( $keyword, $notfound = false ) {
518 return yourls_get_keyword_info( $keyword, 'timestamp', $notfound );
522 * Update click count on a short URL. Return 0/1 for error/success.
525 function yourls_update_clicks( $keyword, $clicks = false ) {
526 // Allow plugins to short-circuit the whole function
527 $pre = yourls_apply_filter( 'shunt_update_clicks', false, $keyword, $clicks );
528 if ( false !== $pre )
532 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
533 $table = YOURLS_DB_TABLE_URL;
534 if ( $clicks !== false && is_int( $clicks ) && $clicks >= 0 )
535 $update = $ydb->query( "UPDATE `$table` SET `clicks` = $clicks WHERE `keyword` = '$keyword'" );
537 $update = $ydb->query( "UPDATE `$table` SET `clicks` = clicks + 1 WHERE `keyword` = '$keyword'" );
539 yourls_do_action( 'update_clicks', $keyword, $update, $clicks );
544 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
547 function yourls_get_stats( $filter = 'top', $limit = 10, $start = 0 ) {
556 $sort_by = 'timestamp';
557 $sort_order = 'desc';
567 $sort_order = 'desc';
572 $limit = intval( $limit );
573 $start = intval( $start );
576 $table_url = YOURLS_DB_TABLE_URL;
577 $results = $ydb->get_results( "SELECT * FROM `$table_url` WHERE 1=1 ORDER BY `$sort_by` $sort_order LIMIT $start, $limit;" );
582 foreach ( (array)$results as $res ) {
583 $return['links']['link_'.$i++] = array(
584 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
586 'title' => $res->title,
587 'timestamp'=> $res->timestamp,
589 'clicks' => $res->clicks,
594 $return['stats'] = yourls_get_db_stats();
596 $return['statusCode'] = 200;
598 return yourls_apply_filter( 'get_stats', $return, $filter, $limit, $start );
602 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
605 function yourls_get_link_stats( $shorturl ) {
608 $table_url = YOURLS_DB_TABLE_URL;
609 $shorturl = yourls_escape( yourls_sanitize_keyword( $shorturl ) );
611 $res = $ydb->get_row( "SELECT * FROM `$table_url` WHERE keyword = '$shorturl';" );
618 'message' => 'Error: short URL not found',
623 'message' => 'success',
625 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
627 'title' => $res->title,
628 'timestamp'=> $res->timestamp,
630 'clicks' => $res->clicks,
635 return yourls_apply_filter( 'get_link_stats', $return, $shorturl );
639 * Get total number of URLs and sum of clicks. Input: optional "AND WHERE" clause. Returns array
641 * IMPORTANT NOTE: make sure arguments for the $where clause have been sanitized and yourls_escape()'d
642 * before calling this function.
645 function yourls_get_db_stats( $where = '' ) {
647 $table_url = YOURLS_DB_TABLE_URL;
649 $totals = $ydb->get_row( "SELECT COUNT(keyword) as count, SUM(clicks) as sum FROM `$table_url` WHERE 1=1 $where" );
650 $return = array( 'total_links' => $totals->count, 'total_clicks' => $totals->sum );
652 return yourls_apply_filter( 'get_db_stats', $return, $where );
656 * Get number of SQL queries performed
659 function yourls_get_num_queries() {
662 return yourls_apply_filter( 'get_num_queries', $ydb->num_queries );
666 * Returns a sanitized a user agent string. Given what I found on http://www.user-agents.org/ it should be OK.
669 function yourls_get_user_agent() {
670 if ( !isset( $_SERVER['HTTP_USER_AGENT'] ) )
673 $ua = strip_tags( html_entity_decode( $_SERVER['HTTP_USER_AGENT'] ));
674 $ua = preg_replace('![^0-9a-zA-Z\':., /{}\(\)\[\]\+@&\!\?;_\-=~\*\#]!', '', $ua );
676 return yourls_apply_filter( 'get_user_agent', substr( $ua, 0, 254 ) );
680 * Redirect to another page
683 function yourls_redirect( $location, $code = 301 ) {
684 yourls_do_action( 'pre_redirect', $location, $code );
685 $location = yourls_apply_filter( 'redirect_location', $location, $code );
686 $code = yourls_apply_filter( 'redirect_code', $code, $location );
687 // Redirect, either properly if possible, or via Javascript otherwise
688 if( !headers_sent() ) {
689 yourls_status_header( $code );
690 header( "Location: $location" );
692 yourls_redirect_javascript( $location );
698 * Set HTTP status header
701 function yourls_status_header( $code = 200 ) {
705 $protocol = $_SERVER['SERVER_PROTOCOL'];
706 if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
707 $protocol = 'HTTP/1.0';
709 $code = intval( $code );
710 $desc = yourls_get_HTTP_status( $code );
712 @header ("$protocol $code $desc"); // This causes problems on IIS and some FastCGI setups
713 yourls_do_action( 'status_header', $code );
717 * Redirect to another page using Javascript. Set optional (bool)$dontwait to false to force manual redirection (make sure a message has been read by user)
720 function yourls_redirect_javascript( $location, $dontwait = true ) {
721 yourls_do_action( 'pre_redirect_javascript', $location, $dontwait );
722 $location = yourls_apply_filter( 'redirect_javascript', $location, $dontwait );
724 $message = yourls_s( 'if you are not redirected after 10 seconds, please <a href="%s">click here</a>', $location );
726 <script type="text/javascript">
727 window.location="$location";
729 <small>($message)</small>
732 echo '<p>' . yourls_s( 'Please <a href="%s">click here</a>', $location ) . '</p>';
734 yourls_do_action( 'post_redirect_javascript', $location );
738 * Return a HTTP status code
741 function yourls_get_HTTP_status( $code ) {
742 $code = intval( $code );
743 $headers_desc = array(
745 101 => 'Switching Protocols',
751 203 => 'Non-Authoritative Information',
753 205 => 'Reset Content',
754 206 => 'Partial Content',
755 207 => 'Multi-Status',
758 300 => 'Multiple Choices',
759 301 => 'Moved Permanently',
762 304 => 'Not Modified',
765 307 => 'Temporary Redirect',
767 400 => 'Bad Request',
768 401 => 'Unauthorized',
769 402 => 'Payment Required',
772 405 => 'Method Not Allowed',
773 406 => 'Not Acceptable',
774 407 => 'Proxy Authentication Required',
775 408 => 'Request Timeout',
778 411 => 'Length Required',
779 412 => 'Precondition Failed',
780 413 => 'Request Entity Too Large',
781 414 => 'Request-URI Too Long',
782 415 => 'Unsupported Media Type',
783 416 => 'Requested Range Not Satisfiable',
784 417 => 'Expectation Failed',
785 422 => 'Unprocessable Entity',
787 424 => 'Failed Dependency',
788 426 => 'Upgrade Required',
790 500 => 'Internal Server Error',
791 501 => 'Not Implemented',
792 502 => 'Bad Gateway',
793 503 => 'Service Unavailable',
794 504 => 'Gateway Timeout',
795 505 => 'HTTP Version Not Supported',
796 506 => 'Variant Also Negotiates',
797 507 => 'Insufficient Storage',
798 510 => 'Not Extended'
801 if ( isset( $headers_desc[$code] ) )
802 return $headers_desc[$code];
808 * Log a redirect (for stats)
810 * This function does not check for the existence of a valid keyword, in order to save a query. Make sure the keyword
811 * exists before calling it.
814 * @param string $keyword short URL keyword
815 * @return mixed Result of the INSERT query (1 on success)
817 function yourls_log_redirect( $keyword ) {
818 // Allow plugins to short-circuit the whole function
819 $pre = yourls_apply_filter( 'shunt_log_redirect', false, $keyword );
820 if ( false !== $pre )
823 if ( !yourls_do_log_redirect() )
827 $table = YOURLS_DB_TABLE_LOG;
829 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
830 $referrer = ( isset( $_SERVER['HTTP_REFERER'] ) ? yourls_escape( yourls_sanitize_url( $_SERVER['HTTP_REFERER'] ) ) : 'direct' );
831 $ua = yourls_escape( yourls_get_user_agent() );
832 $ip = yourls_escape( yourls_get_IP() );
833 $location = yourls_escape( yourls_geo_ip_to_countrycode( $ip ) );
835 return $ydb->query( "INSERT INTO `$table` (click_time, shorturl, referrer, user_agent, ip_address, country_code) VALUES (NOW(), '$keyword', '$referrer', '$ua', '$ip', '$location')" );
839 * Check if we want to not log redirects (for stats)
842 function yourls_do_log_redirect() {
843 return ( !defined( 'YOURLS_NOSTATS' ) || YOURLS_NOSTATS != true );
847 * Converts an IP to a 2 letter country code, using GeoIP database if available in includes/geo/
850 * @param string $ip IP or, if empty string, will be current user IP
851 * @param string $defaut Default string to return if IP doesn't resolve to a country (malformed, private IP...)
852 * @return string 2 letter country code (eg 'US') or $default
854 function yourls_geo_ip_to_countrycode( $ip = '', $default = '' ) {
855 // Allow plugins to short-circuit the Geo IP API
856 $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
857 if ( false !== $location )
861 $ip = yourls_get_IP();
863 // Use IPv4 or IPv6 DB & functions
864 if( false === filter_var( $ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6 ) ) {
866 $func = 'geoip_country_code_by_addr';
869 $func = 'geoip_country_code_by_addr_v6';
872 if ( !file_exists( YOURLS_INC . '/geo/' . $db ) || !file_exists( YOURLS_INC .'/geo/geoip.inc' ) )
875 require_once( YOURLS_INC . '/geo/geoip.inc' );
876 $gi = geoip_open( YOURLS_INC . '/geo/' . $db, GEOIP_STANDARD );
878 $location = call_user_func( $func, $gi, $ip );
879 } catch ( Exception $e ) {
884 if( '' == $location )
885 $location = $default;
887 return yourls_apply_filter( 'geo_ip_to_countrycode', $location, $ip, $default );
891 * Converts a 2 letter country code to long name (ie AU -> Australia)
894 function yourls_geo_countrycode_to_countryname( $code ) {
895 // Allow plugins to short-circuit the Geo IP API
896 $country = yourls_apply_filter( 'shunt_geo_countrycode_to_countryname', false, $code );
897 if ( false !== $country )
900 // Load the Geo class if not already done
901 if( !class_exists( 'GeoIP', false ) ) {
902 $temp = yourls_geo_ip_to_countrycode( '127.0.0.1' );
905 if( class_exists( 'GeoIP', false ) ) {
907 $id = $geo->GEOIP_COUNTRY_CODE_TO_NUMBER[ $code ];
908 $long = $geo->GEOIP_COUNTRY_NAMES[ $id ];
916 * Return flag URL from 2 letter country code
919 function yourls_geo_get_flag( $code ) {
920 if( file_exists( YOURLS_INC.'/geo/flags/flag_'.strtolower($code).'.gif' ) ) {
921 $img = yourls_match_current_protocol( YOURLS_SITE.'/includes/geo/flags/flag_'.( strtolower( $code ) ).'.gif' );
925 return yourls_apply_filter( 'geo_get_flag', $img, $code );
930 * Check if an upgrade is needed
933 function yourls_upgrade_is_needed() {
934 // check YOURLS_DB_VERSION exist && match values stored in YOURLS_DB_TABLE_OPTIONS
935 list( $currentver, $currentsql ) = yourls_get_current_version_from_sql();
936 if( $currentsql < YOURLS_DB_VERSION )
943 * Get current version & db version as stored in the options DB. Prior to 1.4 there's no option table.
946 function yourls_get_current_version_from_sql() {
947 $currentver = yourls_get_option( 'version' );
948 $currentsql = yourls_get_option( 'db_version' );
950 // Values if version is 1.3
956 return array( $currentver, $currentsql);
960 * Read an option from DB (or from cache if available). Return value or $default if not found
962 * Pretty much stolen from WordPress
965 * @param string $option Option name. Expected to not be SQL-escaped.
966 * @param mixed $default Optional value to return if option doesn't exist. Default false.
967 * @return mixed Value set for the option.
969 function yourls_get_option( $option_name, $default = false ) {
972 // Allow plugins to short-circuit options
973 $pre = yourls_apply_filter( 'shunt_option_'.$option_name, false );
974 if ( false !== $pre )
977 // If option not cached already, get its value from the DB
978 if ( !isset( $ydb->option[$option_name] ) ) {
979 $table = YOURLS_DB_TABLE_OPTIONS;
980 $option_name = yourls_escape( $option_name );
981 $row = $ydb->get_row( "SELECT `option_value` FROM `$table` WHERE `option_name` = '$option_name' LIMIT 1" );
982 if ( is_object( $row) ) { // Has to be get_row instead of get_var because of funkiness with 0, false, null values
983 $value = $row->option_value;
984 } else { // option does not exist, so we must cache its non-existence
987 $ydb->option[ $option_name ] = yourls_maybe_unserialize( $value );
990 return yourls_apply_filter( 'get_option_'.$option_name, $ydb->option[$option_name] );
994 * Read all options from DB at once
996 * The goal is to read all options at once and then populate array $ydb->option, to prevent further
997 * SQL queries if we need to read an option value later.
998 * It's also a simple check whether YOURLS is installed or not (no option = assuming not installed) after
999 * a check for DB server reachability has been performed
1003 function yourls_get_all_options() {
1006 // Allow plugins to short-circuit all options. (Note: regular plugins are loaded after all options)
1007 $pre = yourls_apply_filter( 'shunt_all_options', false );
1008 if ( false !== $pre )
1011 $table = YOURLS_DB_TABLE_OPTIONS;
1013 $allopt = $ydb->get_results( "SELECT `option_name`, `option_value` FROM `$table` WHERE 1=1" );
1015 foreach( (array)$allopt as $option ) {
1016 $ydb->option[ $option->option_name ] = yourls_maybe_unserialize( $option->option_value );
1019 if( property_exists( $ydb, 'option' ) ) {
1020 $ydb->option = yourls_apply_filter( 'get_all_options', $ydb->option );
1021 $ydb->installed = true;
1023 // Zero option found: either YOURLS is not installed or DB server is dead
1024 if( !yourls_is_db_alive() ) {
1025 yourls_db_dead(); // YOURLS will die here
1027 $ydb->installed = false;
1032 * Update (add if doesn't exist) an option to DB
1034 * Pretty much stolen from WordPress
1037 * @param string $option Option name. Expected to not be SQL-escaped.
1038 * @param mixed $newvalue Option value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
1039 * @return bool False if value was not updated, true otherwise.
1041 function yourls_update_option( $option_name, $newvalue ) {
1043 $table = YOURLS_DB_TABLE_OPTIONS;
1045 $option_name = trim( $option_name );
1046 if ( empty( $option_name ) )
1049 // Use clone to break object refs -- see commit 09b989d375bac65e692277f61a84fede2fb04ae3
1050 if ( is_object( $newvalue ) )
1051 $newvalue = clone $newvalue;
1053 $option_name = yourls_escape( $option_name );
1055 $oldvalue = yourls_get_option( $option_name );
1057 // If the new and old values are the same, no need to update.
1058 if ( $newvalue === $oldvalue )
1061 if ( false === $oldvalue ) {
1062 yourls_add_option( $option_name, $newvalue );
1066 $_newvalue = yourls_escape( yourls_maybe_serialize( $newvalue ) );
1068 yourls_do_action( 'update_option', $option_name, $oldvalue, $newvalue );
1070 $ydb->query( "UPDATE `$table` SET `option_value` = '$_newvalue' WHERE `option_name` = '$option_name'" );
1072 if ( $ydb->rows_affected == 1 ) {
1073 $ydb->option[ $option_name ] = $newvalue;
1080 * Add an option to the DB
1082 * Pretty much stolen from WordPress
1085 * @param string $option Name of option to add. Expected to not be SQL-escaped.
1086 * @param mixed $value Optional option value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
1087 * @return bool False if option was not added and true otherwise.
1089 function yourls_add_option( $name, $value = '' ) {
1091 $table = YOURLS_DB_TABLE_OPTIONS;
1093 $name = trim( $name );
1094 if ( empty( $name ) )
1097 // Use clone to break object refs -- see commit 09b989d375bac65e692277f61a84fede2fb04ae3
1098 if ( is_object( $value ) )
1099 $value = clone $value;
1101 $name = yourls_escape( $name );
1103 // Make sure the option doesn't already exist
1104 if ( false !== yourls_get_option( $name ) )
1107 $_value = yourls_escape( yourls_maybe_serialize( $value ) );
1109 yourls_do_action( 'add_option', $name, $_value );
1111 $ydb->query( "INSERT INTO `$table` (`option_name`, `option_value`) VALUES ('$name', '$_value')" );
1112 $ydb->option[ $name ] = $value;
1118 * Delete an option from the DB
1120 * Pretty much stolen from WordPress
1123 * @param string $option Option name to delete. Expected to not be SQL-escaped.
1124 * @return bool True, if option is successfully deleted. False on failure.
1126 function yourls_delete_option( $name ) {
1128 $table = YOURLS_DB_TABLE_OPTIONS;
1129 $name = yourls_escape( $name );
1131 // Get the ID, if no ID then return
1132 $option = $ydb->get_row( "SELECT option_id FROM `$table` WHERE `option_name` = '$name'" );
1133 if ( is_null( $option ) || !$option->option_id )
1136 yourls_do_action( 'delete_option', $name );
1138 $ydb->query( "DELETE FROM `$table` WHERE `option_name` = '$name'" );
1139 unset( $ydb->option[ $name ] );
1145 * Serialize data if needed. Stolen from WordPress
1148 * @param mixed $data Data that might be serialized.
1149 * @return mixed A scalar data
1151 function yourls_maybe_serialize( $data ) {
1152 if ( is_array( $data ) || is_object( $data ) )
1153 return serialize( $data );
1155 if ( yourls_is_serialized( $data, false ) )
1156 return serialize( $data );
1162 * Check value to find if it was serialized. Stolen from WordPress
1165 * @param mixed $data Value to check to see if was serialized.
1166 * @param bool $strict Optional. Whether to be strict about the end of the string. Defaults true.
1167 * @return bool False if not serialized and true if it was.
1169 function yourls_is_serialized( $data, $strict = true ) {
1170 // if it isn't a string, it isn't serialized
1171 if ( ! is_string( $data ) )
1173 $data = trim( $data );
1174 if ( 'N;' == $data )
1176 $length = strlen( $data );
1179 if ( ':' !== $data[1] )
1182 $lastc = $data[ $length - 1 ];
1183 if ( ';' !== $lastc && '}' !== $lastc )
1186 $semicolon = strpos( $data, ';' );
1187 $brace = strpos( $data, '}' );
1188 // Either ; or } must exist.
1189 if ( false === $semicolon && false === $brace )
1191 // But neither must be in the first X characters.
1192 if ( false !== $semicolon && $semicolon < 3 )
1194 if ( false !== $brace && $brace < 4 )
1201 if ( '"' !== $data[ $length - 2 ] )
1203 } elseif ( false === strpos( $data, '"' ) ) {
1206 // or else fall through
1209 return (bool) preg_match( "/^{$token}:[0-9]+:/s", $data );
1213 $end = $strict ? '$' : '';
1214 return (bool) preg_match( "/^{$token}:[0-9.E-]+;$end/", $data );
1220 * Unserialize value only if it was serialized. Stolen from WP
1223 * @param string $original Maybe unserialized original, if is needed.
1224 * @return mixed Unserialized data can be any type.
1226 function yourls_maybe_unserialize( $original ) {
1227 if ( yourls_is_serialized( $original ) ) // don't attempt to unserialize data that wasn't serialized going in
1228 return @unserialize( $original );
1233 * Determine if the current page is private
1236 function yourls_is_private() {
1239 if ( defined('YOURLS_PRIVATE') && YOURLS_PRIVATE == true ) {
1241 // Allow overruling for particular pages:
1244 if( yourls_is_API() ) {
1245 if( !defined('YOURLS_PRIVATE_API') || YOURLS_PRIVATE_API != false )
1249 } elseif( yourls_is_infos() ) {
1250 if( !defined('YOURLS_PRIVATE_INFOS') || YOURLS_PRIVATE_INFOS !== false )
1260 return yourls_apply_filter( 'is_private', $private );
1264 * Show login form if required
1267 function yourls_maybe_require_auth() {
1268 if( yourls_is_private() ) {
1269 yourls_do_action( 'require_auth' );
1270 require_once( YOURLS_INC.'/auth.php' );
1272 yourls_do_action( 'require_no_auth' );
1277 * Allow several short URLs for the same long URL ?
1280 function yourls_allow_duplicate_longurls() {
1281 // special treatment if API to check for WordPress plugin requests
1282 if( yourls_is_API() ) {
1283 if ( isset($_REQUEST['source']) && $_REQUEST['source'] == 'plugin' )
1286 return ( defined( 'YOURLS_UNIQUE_URLS' ) && YOURLS_UNIQUE_URLS == false );
1290 * Return array of keywords that redirect to the submitted long URL
1293 * @param string $longurl long url
1294 * @param string $sort Optional ORDER BY order (can be 'keyword', 'title', 'timestamp' or'clicks')
1295 * @param string $order Optional SORT order (can be 'ASC' or 'DESC')
1296 * @return array array of keywords
1298 function yourls_get_longurl_keywords( $longurl, $sort = 'none', $order = 'ASC' ) {
1300 $longurl = yourls_escape( yourls_sanitize_url( $longurl ) );
1301 $table = YOURLS_DB_TABLE_URL;
1302 $query = "SELECT `keyword` FROM `$table` WHERE `url` = '$longurl'";
1304 // Ensure sort is a column in database (@TODO: update verification array if database changes)
1305 if ( in_array( $sort, array('keyword','title','timestamp','clicks') ) ) {
1306 $query .= " ORDER BY '".$sort."'";
1307 if ( in_array( $order, array( 'ASC','DESC' ) ) ) {
1308 $query .= " ".$order;
1311 return yourls_apply_filter( 'get_longurl_keywords', $ydb->get_col( $query ), $longurl );
1315 * Check if an IP shortens URL too fast to prevent DB flood. Return true, or die.
1318 function yourls_check_IP_flood( $ip = '' ) {
1320 // Allow plugins to short-circuit the whole function
1321 $pre = yourls_apply_filter( 'shunt_check_IP_flood', false, $ip );
1322 if ( false !== $pre )
1325 yourls_do_action( 'pre_check_ip_flood', $ip ); // at this point $ip can be '', check it if your plugin hooks in here
1327 // Raise white flag if installing or if no flood delay defined
1329 ( defined('YOURLS_FLOOD_DELAY_SECONDS') && YOURLS_FLOOD_DELAY_SECONDS === 0 ) ||
1330 !defined('YOURLS_FLOOD_DELAY_SECONDS') ||
1331 yourls_is_installing()
1335 // Don't throttle logged in users
1336 if( yourls_is_private() ) {
1337 if( yourls_is_valid_user() === true )
1341 // Don't throttle whitelist IPs
1342 if( defined( 'YOURLS_FLOOD_IP_WHITELIST' ) && YOURLS_FLOOD_IP_WHITELIST ) {
1343 $whitelist_ips = explode( ',', YOURLS_FLOOD_IP_WHITELIST );
1344 foreach( (array)$whitelist_ips as $whitelist_ip ) {
1345 $whitelist_ip = trim( $whitelist_ip );
1346 if ( $whitelist_ip == $ip )
1351 $ip = ( $ip ? yourls_sanitize_ip( $ip ) : yourls_get_IP() );
1352 $ip = yourls_escape( $ip );
1354 yourls_do_action( 'check_ip_flood', $ip );
1357 $table = YOURLS_DB_TABLE_URL;
1359 $lasttime = $ydb->get_var( "SELECT `timestamp` FROM $table WHERE `ip` = '$ip' ORDER BY `timestamp` DESC LIMIT 1" );
1362 $then = date( 'U', strtotime( $lasttime ) );
1363 if( ( $now - $then ) <= YOURLS_FLOOD_DELAY_SECONDS ) {
1365 yourls_do_action( 'ip_flood', $ip, $now - $then );
1366 yourls_die( yourls__( 'Too many URLs added too fast. Slow down please.' ), yourls__( 'Forbidden' ), 403 );
1374 * Check if YOURLS is installing
1379 function yourls_is_installing() {
1380 $installing = defined( 'YOURLS_INSTALLING' ) && YOURLS_INSTALLING == true;
1381 return yourls_apply_filter( 'is_installing', $installing );
1385 * Check if YOURLS is upgrading
1390 function yourls_is_upgrading() {
1391 $upgrading = defined( 'YOURLS_UPGRADING' ) && YOURLS_UPGRADING == true;
1392 return yourls_apply_filter( 'is_upgrading', $upgrading );
1397 * Check if YOURLS is installed
1399 * Checks property $ydb->installed that is created by yourls_get_all_options()
1401 * See inline comment for updating from 1.3 or prior.
1404 function yourls_is_installed() {
1406 $is_installed = ( property_exists( $ydb, 'installed' ) && $ydb->installed == true );
1407 return yourls_apply_filter( 'is_installed', $is_installed );
1409 /* Note: this test won't work on YOURLS 1.3 or older (Aug 2009...)
1410 Should someone complain that they cannot upgrade directly from
1411 1.3 to 1.7: first, laugh at them, then ask them to install 1.6 first.
1416 * Generate random string of (int)$length length and type $type (see function for details)
1419 function yourls_rnd_string ( $length = 5, $type = 0, $charlist = '' ) {
1421 $length = intval( $length );
1423 // define possible characters
1426 // custom char list, or comply to charset as defined in config
1428 $possible = $charlist ? $charlist : yourls_get_shorturl_charset() ;
1431 // no vowels to make no offending word, no 0/1/o/l to avoid confusion between letters & digits. Perfect for passwords.
1433 $possible = "23456789bcdfghjkmnpqrstvwxyz";
1436 // Same, with lower + upper
1438 $possible = "23456789bcdfghjkmnpqrstvwxyzBCDFGHJKMNPQRSTVWXYZ";
1441 // all letters, lowercase
1443 $possible = "abcdefghijklmnopqrstuvwxyz";
1446 // all letters, lowercase + uppercase
1448 $possible = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1451 // all digits & letters lowercase
1453 $possible = "0123456789abcdefghijklmnopqrstuvwxyz";
1456 // all digits & letters lowercase + uppercase
1458 $possible = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1463 $str = substr( str_shuffle( $possible ), 0, $length );
1465 return yourls_apply_filter( 'rnd_string', $str, $length, $type, $charlist );
1469 * Return salted string
1472 function yourls_salt( $string ) {
1473 $salt = defined('YOURLS_COOKIEKEY') ? YOURLS_COOKIEKEY : md5(__FILE__) ;
1474 return yourls_apply_filter( 'yourls_salt', md5 ($string . $salt), $string );
1478 * Add a query var to a URL and return URL. Completely stolen from WP.
1480 * Works with one of these parameter patterns:
1481 * array( 'var' => 'value' )
1482 * array( 'var' => 'value' ), $url
1484 * 'var', 'value', $url
1485 * If $url omitted, uses $_SERVER['REQUEST_URI']
1488 function yourls_add_query_arg() {
1490 if ( is_array( func_get_arg(0) ) ) {
1491 if ( @func_num_args() < 2 || false === @func_get_arg( 1 ) )
1492 $uri = $_SERVER['REQUEST_URI'];
1494 $uri = @func_get_arg( 1 );
1496 if ( @func_num_args() < 3 || false === @func_get_arg( 2 ) )
1497 $uri = $_SERVER['REQUEST_URI'];
1499 $uri = @func_get_arg( 2 );
1502 $uri = str_replace( '&', '&', $uri );
1505 if ( $frag = strstr( $uri, '#' ) )
1506 $uri = substr( $uri, 0, -strlen( $frag ) );
1510 if ( preg_match( '|^https?://|i', $uri, $matches ) ) {
1511 $protocol = $matches[0];
1512 $uri = substr( $uri, strlen( $protocol ) );
1517 if ( strpos( $uri, '?' ) !== false ) {
1518 $parts = explode( '?', $uri, 2 );
1519 if ( 1 == count( $parts ) ) {
1523 $base = $parts[0] . '?';
1526 } elseif ( !empty( $protocol ) || strpos( $uri, '=' ) === false ) {
1534 parse_str( $query, $qs );
1535 $qs = yourls_urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
1536 if ( is_array( func_get_arg( 0 ) ) ) {
1537 $kayvees = func_get_arg( 0 );
1538 $qs = array_merge( $qs, $kayvees );
1540 $qs[func_get_arg( 0 )] = func_get_arg( 1 );
1543 foreach ( (array) $qs as $k => $v ) {
1548 $ret = http_build_query( $qs );
1549 $ret = trim( $ret, '?' );
1550 $ret = preg_replace( '#=(&|$)#', '$1', $ret );
1551 $ret = $protocol . $base . $ret . $frag;
1552 $ret = rtrim( $ret, '?' );
1557 * Navigates through an array and encodes the values to be used in a URL. Stolen from WP, used in yourls_add_query_arg()
1560 function yourls_urlencode_deep( $value ) {
1561 $value = is_array( $value ) ? array_map( 'yourls_urlencode_deep', $value ) : urlencode( $value );
1566 * Remove arg from query. Opposite of yourls_add_query_arg. Stolen from WP.
1569 function yourls_remove_query_arg( $key, $query = false ) {
1570 if ( is_array( $key ) ) { // removing multiple keys
1571 foreach ( $key as $k )
1572 $query = yourls_add_query_arg( $k, false, $query );
1575 return yourls_add_query_arg( $key, false, $query );
1579 * Return a time-dependent string for nonce creation
1582 function yourls_tick() {
1583 return ceil( time() / YOURLS_NONCE_LIFE );
1587 * Create a time limited, action limited and user limited token
1590 function yourls_create_nonce( $action, $user = false ) {
1591 if( false == $user )
1592 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1593 $tick = yourls_tick();
1594 return substr( yourls_salt($tick . $action . $user), 0, 10 );
1598 * Create a nonce field for inclusion into a form
1601 function yourls_nonce_field( $action, $name = 'nonce', $user = false, $echo = true ) {
1602 $field = '<input type="hidden" id="'.$name.'" name="'.$name.'" value="'.yourls_create_nonce( $action, $user ).'" />';
1609 * Add a nonce to a URL. If URL omitted, adds nonce to current URL
1612 function yourls_nonce_url( $action, $url = false, $name = 'nonce', $user = false ) {
1613 $nonce = yourls_create_nonce( $action, $user );
1614 return yourls_add_query_arg( $name, $nonce, $url );
1618 * Check validity of a nonce (ie time span, user and action match).
1620 * Returns true if valid, dies otherwise (yourls_die() or die($return) if defined)
1621 * if $nonce is false or unspecified, it will use $_REQUEST['nonce']
1624 function yourls_verify_nonce( $action, $nonce = false, $user = false, $return = '' ) {
1626 if( false == $user )
1627 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1629 // get current nonce value
1630 if( false == $nonce && isset( $_REQUEST['nonce'] ) )
1631 $nonce = $_REQUEST['nonce'];
1633 // what nonce should be
1634 $valid = yourls_create_nonce( $action, $user );
1636 if( $nonce == $valid ) {
1641 yourls_die( yourls__( 'Unauthorized action or expired link' ), yourls__( 'Error' ), 403 );
1646 * Converts keyword into short link (prepend with YOURLS base URL)
1649 function yourls_link( $keyword = '' ) {
1650 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword );
1651 return yourls_apply_filter( 'yourls_link', $link, $keyword );
1655 * Converts keyword into stat link (prepend with YOURLS base URL, append +)
1658 function yourls_statlink( $keyword = '' ) {
1659 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword ) . '+';
1660 if( yourls_is_ssl() )
1661 $link = yourls_set_url_scheme( $link, 'https' );
1662 return yourls_apply_filter( 'yourls_statlink', $link, $keyword );
1666 * Check if we'll need interface display function (ie not API or redirection)
1669 function yourls_has_interface() {
1670 if( yourls_is_API() or yourls_is_GO() )
1676 * Check if we're in API mode. Returns bool
1679 function yourls_is_API() {
1680 if ( defined( 'YOURLS_API' ) && YOURLS_API == true )
1686 * Check if we're in Ajax mode. Returns bool
1689 function yourls_is_Ajax() {
1690 if ( defined( 'YOURLS_AJAX' ) && YOURLS_AJAX == true )
1696 * Check if we're in GO mode (yourls-go.php). Returns bool
1699 function yourls_is_GO() {
1700 if ( defined( 'YOURLS_GO' ) && YOURLS_GO == true )
1706 * Check if we're displaying stats infos (yourls-infos.php). Returns bool
1709 function yourls_is_infos() {
1710 if ( defined( 'YOURLS_INFOS' ) && YOURLS_INFOS == true )
1716 * Check if we're in the admin area. Returns bool
1719 function yourls_is_admin() {
1720 if ( defined( 'YOURLS_ADMIN' ) && YOURLS_ADMIN == true )
1726 * Check if the server seems to be running on Windows. Not exactly sure how reliable this is.
1729 function yourls_is_windows() {
1730 return defined( 'DIRECTORY_SEPARATOR' ) && DIRECTORY_SEPARATOR == '\\';
1734 * Check if SSL is required. Returns bool.
1737 function yourls_needs_ssl() {
1738 if ( defined('YOURLS_ADMIN_SSL') && YOURLS_ADMIN_SSL == true )
1744 * Return admin link, with SSL preference if applicable.
1747 function yourls_admin_url( $page = '' ) {
1748 $admin = YOURLS_SITE . '/admin/' . $page;
1749 if( yourls_is_ssl() or yourls_needs_ssl() )
1750 $admin = yourls_set_url_scheme( $admin, 'https' );
1751 return yourls_apply_filter( 'admin_url', $admin, $page );
1755 * Return YOURLS_SITE or URL under YOURLS setup, with SSL preference
1758 function yourls_site_url( $echo = true, $url = '' ) {
1759 $url = yourls_get_relative_url( $url );
1760 $url = trim( YOURLS_SITE . '/' . $url, '/' );
1762 // Do not enforce (checking yourls_need_ssl() ) but check current usage so it won't force SSL on non-admin pages
1763 if( yourls_is_ssl() )
1764 $url = yourls_set_url_scheme( $url, 'https' );
1765 $url = yourls_apply_filter( 'site_url', $url );
1772 * Check if SSL is used, returns bool. Stolen from WP.
1775 function yourls_is_ssl() {
1777 if ( isset( $_SERVER['HTTPS'] ) ) {
1778 if ( 'on' == strtolower( $_SERVER['HTTPS'] ) )
1780 if ( '1' == $_SERVER['HTTPS'] )
1782 } elseif ( isset( $_SERVER['SERVER_PORT'] ) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
1785 return yourls_apply_filter( 'is_ssl', $is_ssl );
1789 * Get a remote page title
1791 * This function returns a string: either the page title as defined in HTML, or the URL if not found
1792 * The function tries to convert funky characters found in titles to UTF8, from the detected charset.
1793 * Charset in use is guessed from HTML meta tag, or if not found, from server's 'content-type' response.
1795 * @param string $url URL
1796 * @return string Title (sanitized) or the URL if no title found
1798 function yourls_get_remote_title( $url ) {
1799 // Allow plugins to short-circuit the whole function
1800 $pre = yourls_apply_filter( 'shunt_get_remote_title', false, $url );
1801 if ( false !== $pre )
1804 $url = yourls_sanitize_url( $url );
1806 // Only deal with http(s)://
1807 if( !in_array( yourls_get_protocol( $url ), array( 'http://', 'https://' ) ) )
1810 $title = $charset = false;
1812 $response = yourls_http_get( $url ); // can be a Request object or an error string
1813 if( is_string( $response ) ) {
1817 // Page content. No content? Return the URL
1818 $content = $response->body;
1822 // look for <title>. No title found? Return the URL
1823 if ( preg_match('/<title>(.*?)<\/title>/is', $content, $found ) ) {
1830 // Now we have a title. We'll try to get proper utf8 from it.
1832 // Get charset as (and if) defined by the HTML meta tag. We should match
1833 // <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
1834 // or <meta charset='utf-8'> and all possible variations: see https://gist.github.com/ozh/7951236
1835 if ( preg_match( '/<meta[^>]*charset\s*=["\' ]*([a-zA-Z0-9\-_]+)/is', $content, $found ) ) {
1836 $charset = $found[1];
1839 // No charset found in HTML. Get charset as (and if) defined by the server response
1840 $_charset = current( $response->headers->getValues( 'content-type' ) );
1841 if( preg_match( '/charset=(\S+)/', $_charset, $found ) ) {
1842 $charset = trim( $found[1], ';' );
1847 // Conversion to utf-8 if what we have is not utf8 already
1848 if( strtolower( $charset ) != 'utf-8' && function_exists( 'mb_convert_encoding' ) ) {
1849 // We use @ to remove warnings because mb_ functions are easily bitching about illegal chars
1851 $title = @mb_convert_encoding( $title, 'UTF-8', $charset );
1853 $title = @mb_convert_encoding( $title, 'UTF-8' );
1857 // Remove HTML entities
1858 $title = html_entity_decode( $title, ENT_QUOTES, 'UTF-8' );
1860 // Strip out evil things
1861 $title = yourls_sanitize_title( $title );
1863 return yourls_apply_filter( 'get_remote_title', $title, $url );
1867 * Quick UA check for mobile devices. Return boolean.
1870 function yourls_is_mobile_device() {
1873 'android', 'blackberry', 'blazer',
1874 'compal', 'elaine', 'fennec', 'hiptop',
1875 'iemobile', 'iphone', 'ipod', 'ipad',
1876 'iris', 'kindle', 'opera mobi', 'opera mini',
1877 'palm', 'phone', 'pocket', 'psp', 'symbian',
1878 'treo', 'wap', 'windows ce', 'windows phone'
1881 // Current user-agent
1882 $current = strtolower( $_SERVER['HTTP_USER_AGENT'] );
1885 $is_mobile = ( str_replace( $mobiles, '', $current ) != $current );
1886 return yourls_apply_filter( 'is_mobile_device', $is_mobile );
1890 * Get request in YOURLS base (eg in 'http://site.com/yourls/abcd' get 'abdc')
1893 function yourls_get_request() {
1894 // Allow plugins to short-circuit the whole function
1895 $pre = yourls_apply_filter( 'shunt_get_request', false );
1896 if ( false !== $pre )
1899 static $request = null;
1901 yourls_do_action( 'pre_get_request', $request );
1903 if( $request !== null )
1906 // Ignore protocol & www. prefix
1907 $root = str_replace( array( 'https://', 'http://', 'https://www.', 'http://www.' ), '', YOURLS_SITE );
1908 // Case insensitive comparison of the YOURLS root to match both http://Sho.rt/blah and http://sho.rt/blah
1909 $request = preg_replace( "!$root/!i", '', $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 1 );
1911 // Unless request looks like a full URL (ie request is a simple keyword) strip query string
1912 if( !preg_match( "@^[a-zA-Z]+://.+@", $request ) ) {
1913 $request = current( explode( '?', $request ) );
1916 return yourls_apply_filter( 'get_request', $request );
1920 * Change protocol to match current scheme used (http or https)
1923 function yourls_match_current_protocol( $url, $normal = 'http://', $ssl = 'https://' ) {
1924 if( yourls_is_ssl() )
1925 $url = str_replace( $normal, $ssl, $url );
1926 return yourls_apply_filter( 'match_current_protocol', $url );
1930 * Fix $_SERVER['REQUEST_URI'] variable for various setups. Stolen from WP.
1933 function yourls_fix_request_uri() {
1935 $default_server_values = array(
1936 'SERVER_SOFTWARE' => '',
1937 'REQUEST_URI' => '',
1939 $_SERVER = array_merge( $default_server_values, $_SERVER );
1941 // Fix for IIS when running with PHP ISAPI
1942 if ( empty( $_SERVER['REQUEST_URI'] ) || ( php_sapi_name() != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
1945 if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
1946 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
1948 // IIS Isapi_Rewrite
1949 else if ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
1950 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
1952 // Use ORIG_PATH_INFO if there is no PATH_INFO
1953 if ( !isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) )
1954 $_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
1956 // Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
1957 if ( isset( $_SERVER['PATH_INFO'] ) ) {
1958 if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
1959 $_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
1961 $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
1964 // Append the query string if it exists and isn't null
1965 if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
1966 $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
1973 * Shutdown function, runs just before PHP shuts down execution. Stolen from WP
1976 function yourls_shutdown() {
1977 yourls_do_action( 'shutdown' );
1981 * Auto detect custom favicon in /user directory, fallback to YOURLS favicon, and echo/return its URL
1984 function yourls_favicon( $echo = true ) {
1985 static $favicon = null;
1987 if( $favicon !== null ) {
1995 // search for favicon.(gif|ico|png|jpg|svg)
1996 foreach( array( 'gif', 'ico', 'png', 'jpg', 'svg' ) as $ext ) {
1997 if( file_exists( YOURLS_USERDIR. '/favicon.' . $ext ) ) {
1998 $custom = 'favicon.' . $ext;
2004 $favicon = yourls_site_url( false, YOURLS_USERURL . '/' . $custom );
2006 $favicon = yourls_site_url( false ) . '/images/favicon.gif';
2016 * Check for maintenance mode. If yes, die. See yourls_maintenance_mode(). Stolen from WP.
2019 function yourls_check_maintenance_mode() {
2021 $file = YOURLS_ABSPATH . '/.maintenance' ;
2022 if ( !file_exists( $file ) || yourls_is_upgrading() || yourls_is_installing() )
2025 global $maintenance_start;
2027 include_once( $file );
2028 // If the $maintenance_start timestamp is older than 10 minutes, don't die.
2029 if ( ( time() - $maintenance_start ) >= 600 )
2032 // Use any /user/maintenance.php file
2033 if( file_exists( YOURLS_USERDIR.'/maintenance.php' ) ) {
2034 include_once( YOURLS_USERDIR.'/maintenance.php' );
2038 // https://www.youtube.com/watch?v=Xw-m4jEY-Ns
2039 $title = yourls__( 'Service temporarily unavailable' );
2040 $message = yourls__( 'Our service is currently undergoing scheduled maintenance.' ) . "</p>\n<p>" .
2041 yourls__( 'Things should not last very long, thank you for your patience and please excuse the inconvenience' );
2042 yourls_die( $message, $title , 503 );
2047 * Return current admin page, or null if not an admin page
2049 * @return mixed string if admin page, null if not an admin page
2052 function yourls_current_admin_page() {
2053 if( yourls_is_admin() ) {
2054 $current = substr( yourls_get_request(), 6 );
2055 if( $current === false )
2056 $current = 'index.php'; // if current page is http://sho.rt/admin/ instead of http://sho.rt/admin/index.php
2064 * Check if a URL protocol is allowed
2066 * Checks a URL against a list of whitelisted protocols. Protocols must be defined with
2067 * their complete scheme name, ie 'stuff:' or 'stuff://' (for instance, 'mailto:' is a valid
2068 * protocol, 'mailto://' isn't, and 'http:' with no double slashed isn't either
2072 * @param string $url URL to be check
2073 * @param array $protocols Optional. Array of protocols, defaults to global $yourls_allowedprotocols
2074 * @return boolean true if protocol allowed, false otherwise
2076 function yourls_is_allowed_protocol( $url, $protocols = array() ) {
2077 if( ! $protocols ) {
2078 global $yourls_allowedprotocols;
2079 $protocols = $yourls_allowedprotocols;
2082 $protocol = yourls_get_protocol( $url );
2083 return yourls_apply_filter( 'is_allowed_protocol', in_array( $protocol, $protocols ), $url, $protocols );
2087 * Get protocol from a URL (eg mailto:, http:// ...)
2091 * @param string $url URL to be check
2092 * @return string Protocol, with slash slash if applicable. Empty string if no protocol
2094 function yourls_get_protocol( $url ) {
2095 preg_match( '!^[a-zA-Z0-9\+\.-]+:(//)?!', $url, $matches );
2097 http://en.wikipedia.org/wiki/URI_scheme#Generic_syntax
2098 The scheme name consists of a sequence of characters beginning with a letter and followed by any
2099 combination of letters, digits, plus ("+"), period ("."), or hyphen ("-"). Although schemes are
2100 case-insensitive, the canonical form is lowercase and documents that specify schemes must do so
2101 with lowercase letters. It is followed by a colon (":").
2103 $protocol = ( isset( $matches[0] ) ? $matches[0] : '' );
2104 return yourls_apply_filter( 'get_protocol', $protocol, $url );
2108 * Get relative URL (eg 'abc' from 'http://sho.rt/abc')
2110 * Treat indifferently http & https. If a URL isn't relative to the YOURLS install, return it as is
2111 * or return empty string if $strict is true
2114 * @param string $url URL to relativize
2115 * @param bool $strict if true and if URL isn't relative to YOURLS install, return empty string
2116 * @return string URL
2118 function yourls_get_relative_url( $url, $strict = true ) {
2119 $url = yourls_sanitize_url( $url );
2121 // Remove protocols to make it easier
2122 $noproto_url = str_replace( 'https:', 'http:', $url );
2123 $noproto_site = str_replace( 'https:', 'http:', YOURLS_SITE );
2125 // Trim URL from YOURLS root URL : if no modification made, URL wasn't relative
2126 $_url = str_replace( $noproto_site . '/', '', $noproto_url );
2127 if( $_url == $noproto_url )
2128 $_url = ( $strict ? '' : $url );
2130 return yourls_apply_filter( 'get_relative_url', $_url, $url );
2134 * Marks a function as deprecated and informs when it has been used. Stolen from WP.
2136 * There is a hook deprecated_function that will be called that can be used
2137 * to get the backtrace up to what file and function called the deprecated
2140 * The current behavior is to trigger a user error if YOURLS_DEBUG is true.
2142 * This function is to be used in every function that is deprecated.
2145 * @uses yourls_do_action() Calls 'deprecated_function' and passes the function name, what to use instead,
2146 * and the version the function was deprecated in.
2147 * @uses yourls_apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do
2148 * trigger or false to not trigger error.
2150 * @param string $function The function that was called
2151 * @param string $version The version of WordPress that deprecated the function
2152 * @param string $replacement Optional. The function that should have been called
2154 function yourls_deprecated_function( $function, $version, $replacement = null ) {
2156 yourls_do_action( 'deprecated_function', $function, $replacement, $version );
2158 // Allow plugin to filter the output error trigger
2159 if ( YOURLS_DEBUG && yourls_apply_filters( 'deprecated_function_trigger_error', true ) ) {
2160 if ( ! is_null( $replacement ) )
2161 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) );
2163 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
2168 * Return the value if not an empty string
2170 * Used with array_filter(), to remove empty keys but not keys with value 0 or false
2173 * @param mixed $val Value to test against ''
2174 * @return bool True if not an empty string
2176 function yourls_return_if_not_empty_string( $val ) {
2177 return( $val !== '' );
2181 * Add a message to the debug log
2183 * When in debug mode ( YOURLS_DEBUG == true ) the debug log is echoed in yourls_html_footer()
2184 * Log messages are appended to $ydb->debug_log array, which is instanciated within class ezSQLcore_YOURLS
2187 * @param string $msg Message to add to the debug log
2188 * @return string The message itself
2190 function yourls_debug_log( $msg ) {
2192 $ydb->debug_log[] = $msg;
2197 * Explode a URL in an array of ( 'protocol' , 'slashes if any', 'rest of the URL' )
2199 * Some hosts trip up when a query string contains 'http://' - see http://git.io/j1FlJg
2200 * The idea is that instead of passing the whole URL to a bookmarklet, eg index.php?u=http://blah.com,
2201 * we pass it by pieces to fool the server, eg index.php?proto=http:&slashes=//&rest=blah.com
2203 * Known limitation: this won't work if the rest of the URL itself contains 'http://', for example
2204 * if rest = blah.com/file.php?url=http://foo.com
2208 * with 'mailto:jsmith@example.com?subject=hey' :
2209 * array( 'protocol' => 'mailto:', 'slashes' => '', 'rest' => 'jsmith@example.com?subject=hey' )
2211 * with 'http://example.com/blah.html' :
2212 * array( 'protocol' => 'http:', 'slashes' => '//', 'rest' => 'example.com/blah.html' )
2215 * @param string $url URL to be parsed
2216 * @param array $array Optional, array of key names to be used in returned array
2217 * @return mixed false if no protocol found, array of ('protocol' , 'slashes', 'rest') otherwise
2219 function yourls_get_protocol_slashes_and_rest( $url, $array = array( 'protocol', 'slashes', 'rest' ) ) {
2220 $proto = yourls_get_protocol( $url );
2222 if( !$proto or count( $array ) != 3 )
2225 list( $null, $rest ) = explode( $proto, $url, 2 );
2227 list( $proto, $slashes ) = explode( ':', $proto );
2229 return array( $array[0] => $proto . ':', $array[1] => $slashes, $array[2] => $rest );
2233 * Set URL scheme (to HTTP or HTTPS)
2236 * @param string $url URL
2237 * @param string $scheme scheme, either 'http' or 'https'
2238 * @return string URL with chosen scheme
2240 function yourls_set_url_scheme( $url, $scheme = false ) {
2241 if( $scheme != 'http' && $scheme != 'https' ) {
2244 return preg_replace( '!^[a-zA-Z0-9\+\.-]+://!', $scheme . '://', $url );