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') ) {
17 $charset = '0123456789abcdefghijklmnopqrstuvwxyz';
19 switch( YOURLS_URL_CONVERT ) {
21 $charset = '0123456789abcdefghijklmnopqrstuvwxyz';
24 case 64: // just because some people get this wrong in their config.php
25 $charset = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
30 $charset = yourls_apply_filter( 'get_shorturl_charset', $charset );
35 * Make an optimized regexp pattern from a string of characters
38 function yourls_make_regexp_pattern( $string ) {
39 $pattern = preg_quote( $string, '-' ); // add - as an escaped characters -- this is fixed in PHP 5.3
40 // TODO: replace char sequences by smart sequences such as 0-9, a-z, A-Z ... ?
45 * Is a URL a short URL?
48 function yourls_is_shorturl( $shorturl ) {
49 // TODO: make sure this function evolves with the feature set.
52 $keyword = yourls_get_relative_url( $shorturl ); // accept either 'http://ozh.in/abc' or 'abc'
53 if( $keyword && $keyword == yourls_sanitize_string( $keyword ) && yourls_keyword_is_taken( $keyword ) ) {
57 return yourls_apply_filter( 'is_shorturl', $is_short, $shorturl );
61 * Check to see if a given keyword is reserved (ie reserved URL or an existing page). Returns bool
64 function yourls_keyword_is_reserved( $keyword ) {
65 global $yourls_reserved_URL;
66 $keyword = yourls_sanitize_keyword( $keyword );
69 if ( in_array( $keyword, $yourls_reserved_URL)
70 or file_exists( YOURLS_ABSPATH ."/pages/$keyword.php" )
71 or is_dir( YOURLS_ABSPATH ."/$keyword" )
75 return yourls_apply_filter( 'keyword_is_reserved', $reserved, $keyword );
79 * Function: Get client IP Address. Returns a DB safe string.
82 function yourls_get_IP() {
83 // Precedence: if set, X-Forwarded-For > HTTP_X_FORWARDED_FOR > HTTP_CLIENT_IP > HTTP_VIA > REMOTE_ADDR
84 $headers = array( 'X-Forwarded-For', 'HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'HTTP_VIA', 'REMOTE_ADDR' );
85 foreach( $headers as $header ) {
86 if ( !empty( $_SERVER[ $header ] ) ) {
87 $ip = $_SERVER[ $header ];
92 // headers can contain multiple IPs (X-Forwarded-For = client, proxy1, proxy2). Take first one.
93 if ( strpos( $ip, ',' ) !== false )
94 $ip = substr( $ip, 0, strpos( $ip, ',' ) );
96 return yourls_apply_filter( 'get_IP', yourls_sanitize_ip( $ip ) );
100 * Get next id a new link will have if no custom keyword provided
103 function yourls_get_next_decimal() {
104 return yourls_apply_filter( 'get_next_decimal', (int)yourls_get_option( 'next_id' ) );
108 * Update id for next link with no custom keyword
111 function yourls_update_next_decimal( $int = '' ) {
112 $int = ( $int == '' ) ? yourls_get_next_decimal() + 1 : (int)$int ;
113 $update = yourls_update_option( 'next_id', $int );
114 yourls_do_action( 'update_next_decimal', $int, $update );
119 * Delete a link in the DB
122 function yourls_delete_link_by_keyword( $keyword ) {
125 $table = YOURLS_DB_TABLE_URL;
126 $keyword = yourls_sanitize_string( $keyword );
127 $delete = $ydb->query("DELETE FROM `$table` WHERE `keyword` = '$keyword';");
128 yourls_do_action( 'delete_link', $keyword, $delete );
133 * SQL query to insert a new link in the DB. Returns boolean for success or failure of the inserting
136 function yourls_insert_link_in_db( $url, $keyword, $title = '' ) {
139 $url = yourls_escape( yourls_sanitize_url( $url ) );
140 $keyword = yourls_escape( yourls_sanitize_keyword( $keyword ) );
141 $title = yourls_escape( yourls_sanitize_title( $title ) );
143 $table = YOURLS_DB_TABLE_URL;
144 $timestamp = date('Y-m-d H:i:s');
145 $ip = yourls_get_IP();
146 $insert = $ydb->query("INSERT INTO `$table` (`keyword`, `url`, `title`, `timestamp`, `ip`, `clicks`) VALUES('$keyword', '$url', '$title', '$timestamp', '$ip', 0);");
148 yourls_do_action( 'insert_link', (bool)$insert, $url, $keyword, $title, $timestamp, $ip );
150 return (bool)$insert;
154 * Check if a URL already exists in the DB. Return NULL (doesn't exist) or an object with URL informations.
157 function yourls_url_exists( $url ) {
158 // Allow plugins to short-circuit the whole function
159 $pre = yourls_apply_filter( 'shunt_url_exists', false, $url );
160 if ( false !== $pre )
164 $table = YOURLS_DB_TABLE_URL;
165 $strip_url = stripslashes($url);
166 $url_exists = $ydb->get_row("SELECT * FROM `$table` WHERE `url` = '".$strip_url."';");
168 return yourls_apply_filter( 'url_exists', $url_exists, $url );
172 * Add a new link in the DB, either with custom keyword, or find one
175 function yourls_add_new_link( $url, $keyword = '', $title = '' ) {
178 // Allow plugins to short-circuit the whole function
179 $pre = yourls_apply_filter( 'shunt_add_new_link', false, $url, $keyword, $title );
180 if ( false !== $pre )
183 $url = yourls_encodeURI( $url );
184 $url = yourls_escape( yourls_sanitize_url( $url ) );
185 if ( !$url || $url == 'http://' || $url == 'https://' ) {
186 $return['status'] = 'fail';
187 $return['code'] = 'error:nourl';
188 $return['message'] = yourls__( 'Missing or malformed URL' );
189 $return['errorCode'] = '400';
190 return yourls_apply_filter( 'add_new_link_fail_nourl', $return, $url, $keyword, $title );
194 $ip = yourls_get_IP();
195 yourls_check_IP_flood( $ip );
197 // Prevent internal redirection loops: cannot shorten a shortened URL
198 if( yourls_get_relative_url( $url ) ) {
199 if( yourls_is_shorturl( $url ) ) {
200 $return['status'] = 'fail';
201 $return['code'] = 'error:noloop';
202 $return['message'] = yourls__( 'URL is a short URL' );
203 $return['errorCode'] = '400';
204 return yourls_apply_filter( 'add_new_link_fail_noloop', $return, $url, $keyword, $title );
208 yourls_do_action( 'pre_add_new_link', $url, $keyword, $title );
210 $strip_url = stripslashes( $url );
213 // duplicates allowed or new URL => store it
214 if( yourls_allow_duplicate_longurls() || !( $url_exists = yourls_url_exists( $url ) ) ) {
216 if( isset( $title ) && !empty( $title ) ) {
217 $title = yourls_sanitize_title( $title );
219 $title = yourls_get_remote_title( $url );
221 $title = yourls_apply_filter( 'add_new_title', $title, $url, $keyword );
223 // Custom keyword provided
226 yourls_do_action( 'add_new_link_custom_keyword', $url, $keyword, $title );
228 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
229 $keyword = yourls_apply_filter( 'custom_keyword', $keyword, $url, $title );
230 if ( !yourls_keyword_is_free( $keyword ) ) {
231 // This shorturl either reserved or taken already
232 $return['status'] = 'fail';
233 $return['code'] = 'error:keyword';
234 $return['message'] = yourls_s( 'Short URL %s already exists in database or is reserved', $keyword );
236 // all clear, store !
237 yourls_insert_link_in_db( $url, $keyword, $title );
238 $return['url'] = array('keyword' => $keyword, 'url' => $strip_url, 'title' => $title, 'date' => date('Y-m-d H:i:s'), 'ip' => $ip );
239 $return['status'] = 'success';
240 $return['message'] = /* //translators: eg "http://someurl/ added to DB" */ yourls_s( '%s added to database', yourls_trim_long_string( $strip_url ) );
241 $return['title'] = $title;
242 $return['html'] = yourls_table_add_row( $keyword, $url, $title, $ip, 0, time() );
243 $return['shorturl'] = YOURLS_SITE .'/'. $keyword;
246 // Create random keyword
249 yourls_do_action( 'add_new_link_create_keyword', $url, $keyword, $title );
251 $timestamp = date( 'Y-m-d H:i:s' );
252 $id = yourls_get_next_decimal();
255 $keyword = yourls_int2string( $id );
256 $keyword = yourls_apply_filter( 'random_keyword', $keyword, $url, $title );
257 $free = yourls_keyword_is_free($keyword);
258 $add_url = @yourls_insert_link_in_db( $url, $keyword, $title );
259 $ok = ($free && $add_url);
260 if ( $ok === false && $add_url === 1 ) {
261 // we stored something, but shouldn't have (ie reserved id)
262 $delete = yourls_delete_link_by_keyword( $keyword );
263 $return['extra_info'] .= '(deleted '.$keyword.')';
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;
275 @yourls_update_next_decimal( $id );
278 // URL was already stored
281 yourls_do_action( 'add_new_link_already_stored', $url, $keyword, $title );
283 $return['status'] = 'fail';
284 $return['code'] = 'error:url';
285 $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 );
286 $return['message'] = /* //translators: eg "http://someurl/ already exists" */ yourls_s( '%s already exists in database', yourls_trim_long_string( $strip_url ) );
287 $return['title'] = $url_exists->title;
288 $return['shorturl'] = YOURLS_SITE .'/'. $url_exists->keyword;
291 yourls_do_action( 'post_add_new_link', $url, $keyword, $title );
293 $return['statusCode'] = 200; // regardless of result, this is still a valid request
294 return yourls_apply_filter( 'add_new_link', $return, $url, $keyword, $title );
302 function yourls_edit_link( $url, $keyword, $newkeyword='', $title='' ) {
305 $table = YOURLS_DB_TABLE_URL;
306 $url = yourls_escape (yourls_sanitize_url( $url ) );
307 $keyword = yourls_escape( yourls_sanitize_string( $keyword ) );
308 $title = yourls_escape( yourls_sanitize_title( $title ) );
309 $newkeyword = yourls_escape( yourls_sanitize_string( $newkeyword ) );
310 $strip_url = stripslashes( $url );
311 $strip_title = stripslashes( $title );
312 $old_url = $ydb->get_var( "SELECT `url` FROM `$table` WHERE `keyword` = '$keyword';" );
314 // Check if new URL is not here already
315 if ( $old_url != $url && !yourls_allow_duplicate_longurls() ) {
316 $new_url_already_there = intval($ydb->get_var("SELECT COUNT(keyword) FROM `$table` WHERE `url` = '$strip_url';"));
318 $new_url_already_there = false;
321 // Check if the new keyword is not here already
322 if ( $newkeyword != $keyword ) {
323 $keyword_is_ok = yourls_keyword_is_free( $newkeyword );
325 $keyword_is_ok = true;
328 yourls_do_action( 'pre_edit_link', $url, $keyword, $newkeyword, $new_url_already_there, $keyword_is_ok );
331 if ( ( !$new_url_already_there || yourls_allow_duplicate_longurls() ) && $keyword_is_ok ) {
332 $update_url = $ydb->query( "UPDATE `$table` SET `url` = '$url', `keyword` = '$newkeyword', `title` = '$title' WHERE `keyword` = '$keyword';" );
334 $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 ) );
335 $return['status'] = 'success';
336 $return['message'] = yourls__( 'Link updated in database' );
338 $return['status'] = 'fail';
339 $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 ) ;
344 $return['status'] = 'fail';
345 $return['message'] = yourls__( 'URL or keyword already exists in database' );
348 return yourls_apply_filter( 'edit_link', $return, $url, $keyword, $newkeyword, $title, $new_url_already_there, $keyword_is_ok );
352 * Update a title link (no checks for duplicates etc..)
355 function yourls_edit_link_title( $keyword, $title ) {
358 $keyword = yourls_escape( yourls_sanitize_keyword( $keyword ) );
359 $title = yourls_escape( yourls_sanitize_title( $title ) );
361 $table = YOURLS_DB_TABLE_URL;
362 $update = $ydb->query("UPDATE `$table` SET `title` = '$title' WHERE `keyword` = '$keyword';");
369 * Check if keyword id is free (ie not already taken, and not reserved). Return bool.
372 function yourls_keyword_is_free( $keyword ) {
374 if ( yourls_keyword_is_reserved( $keyword ) or yourls_keyword_is_taken( $keyword ) )
377 return yourls_apply_filter( 'keyword_is_free', $free, $keyword );
381 * Check if a keyword is taken (ie there is already a short URL with this id). Return bool.
384 function yourls_keyword_is_taken( $keyword ) {
386 // Allow plugins to short-circuit the whole function
387 $pre = yourls_apply_filter( 'shunt_keyword_is_taken', false, $keyword );
388 if ( false !== $pre )
392 $keyword = yourls_sanitize_keyword( $keyword );
394 $table = YOURLS_DB_TABLE_URL;
395 $already_exists = $ydb->get_var( "SELECT COUNT(`keyword`) FROM `$table` WHERE `keyword` = '$keyword';" );
396 if ( $already_exists )
399 return yourls_apply_filter( 'keyword_is_taken', $taken, $keyword );
407 function yourls_db_connect() {
410 if ( !defined( 'YOURLS_DB_USER' )
411 or !defined( 'YOURLS_DB_PASS' )
412 or !defined( 'YOURLS_DB_NAME' )
413 or !defined( 'YOURLS_DB_HOST' )
414 ) yourls_die ( yourls__( 'Incorrect DB config, or could not connect to DB' ), yourls__( 'Fatal error' ), 503 );
416 // Are we standalone or in the WordPress environment?
417 if ( class_exists( 'wpdb', false ) ) {
418 $ydb = new wpdb( YOURLS_DB_USER, YOURLS_DB_PASS, YOURLS_DB_NAME, YOURLS_DB_HOST );
420 $ydb = new ezSQL_mysql( YOURLS_DB_USER, YOURLS_DB_PASS, YOURLS_DB_NAME, YOURLS_DB_HOST );
422 if ( $ydb->last_error )
423 yourls_die( $ydb->last_error, yourls__( 'Fatal error' ), 503 );
425 if ( defined( 'YOURLS_DEBUG' ) && YOURLS_DEBUG === true )
426 $ydb->show_errors = true;
435 function yourls_xml_encode( $array ) {
436 require_once( YOURLS_INC.'/functions-xml.php' );
437 $converter= new yourls_array2xml;
438 return $converter->array2xml( $array );
442 * Return array of all informations associated with keyword. Returns false if keyword not found. Set optional $use_cache to false to force fetching from DB
445 function yourls_get_keyword_infos( $keyword, $use_cache = true ) {
447 $keyword = yourls_sanitize_string( $keyword );
449 yourls_do_action( 'pre_get_keyword', $keyword, $use_cache );
451 if( isset( $ydb->infos[$keyword] ) && $use_cache == true ) {
452 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
455 yourls_do_action( 'get_keyword_not_cached', $keyword );
457 $table = YOURLS_DB_TABLE_URL;
458 $infos = $ydb->get_row( "SELECT * FROM `$table` WHERE `keyword` = '$keyword'" );
461 $infos = (array)$infos;
462 $ydb->infos[ $keyword ] = $infos;
464 $ydb->infos[ $keyword ] = false;
467 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
471 * Return (string) selected information associated with a keyword. Optional $notfound = string default message if nothing found
474 function yourls_get_keyword_info( $keyword, $field, $notfound = false ) {
476 // Allow plugins to short-circuit the whole function
477 $pre = yourls_apply_filter( 'shunt_get_keyword_info', false, $keyword, $field, $notfound );
478 if ( false !== $pre )
481 $keyword = yourls_sanitize_string( $keyword );
482 $infos = yourls_get_keyword_infos( $keyword );
485 if ( isset( $infos[ $field ] ) && $infos[ $field ] !== false )
486 $return = $infos[ $field ];
488 return yourls_apply_filter( 'get_keyword_info', $return, $keyword, $field, $notfound );
492 * Return title associated with keyword. Optional $notfound = string default message if nothing found
495 function yourls_get_keyword_title( $keyword, $notfound = false ) {
496 return yourls_get_keyword_info( $keyword, 'title', $notfound );
500 * Return long URL associated with keyword. Optional $notfound = string default message if nothing found
503 function yourls_get_keyword_longurl( $keyword, $notfound = false ) {
504 return yourls_get_keyword_info( $keyword, 'url', $notfound );
508 * Return number of clicks on a keyword. Optional $notfound = string default message if nothing found
511 function yourls_get_keyword_clicks( $keyword, $notfound = false ) {
512 return yourls_get_keyword_info( $keyword, 'clicks', $notfound );
516 * Return IP that added a keyword. Optional $notfound = string default message if nothing found
519 function yourls_get_keyword_IP( $keyword, $notfound = false ) {
520 return yourls_get_keyword_info( $keyword, 'ip', $notfound );
524 * Return timestamp associated with a keyword. Optional $notfound = string default message if nothing found
527 function yourls_get_keyword_timestamp( $keyword, $notfound = false ) {
528 return yourls_get_keyword_info( $keyword, 'timestamp', $notfound );
532 * Update click count on a short URL. Return 0/1 for error/success.
535 function yourls_update_clicks( $keyword, $clicks = false ) {
536 // Allow plugins to short-circuit the whole function
537 $pre = yourls_apply_filter( 'shunt_update_clicks', false, $keyword, $clicks );
538 if ( false !== $pre )
542 $keyword = yourls_sanitize_string( $keyword );
543 $table = YOURLS_DB_TABLE_URL;
544 if ( $clicks !== false && is_int( $clicks ) && $clicks >= 0 )
545 $update = $ydb->query( "UPDATE `$table` SET `clicks` = $clicks WHERE `keyword` = '$keyword'" );
547 $update = $ydb->query( "UPDATE `$table` SET `clicks` = clicks + 1 WHERE `keyword` = '$keyword'" );
549 yourls_do_action( 'update_clicks', $keyword, $update, $clicks );
554 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
557 function yourls_get_stats( $filter = 'top', $limit = 10, $start = 0 ) {
566 $sort_by = 'timestamp';
567 $sort_order = 'desc';
577 $sort_order = 'desc';
582 $limit = intval( $limit );
583 $start = intval( $start );
586 $table_url = YOURLS_DB_TABLE_URL;
587 $results = $ydb->get_results( "SELECT * FROM `$table_url` WHERE 1=1 ORDER BY `$sort_by` $sort_order LIMIT $start, $limit;" );
592 foreach ( (array)$results as $res ) {
593 $return['links']['link_'.$i++] = array(
594 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
596 'title' => $res->title,
597 'timestamp'=> $res->timestamp,
599 'clicks' => $res->clicks,
604 $return['stats'] = yourls_get_db_stats();
606 $return['statusCode'] = 200;
608 return yourls_apply_filter( 'get_stats', $return, $filter, $limit, $start );
612 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
615 function yourls_get_link_stats( $shorturl ) {
618 $table_url = YOURLS_DB_TABLE_URL;
619 $res = $ydb->get_row( "SELECT * FROM `$table_url` WHERE keyword = '$shorturl';" );
626 'message' => 'Error: short URL not found',
631 'message' => 'success',
633 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
635 'title' => $res->title,
636 'timestamp'=> $res->timestamp,
638 'clicks' => $res->clicks,
643 return yourls_apply_filter( 'get_link_stats', $return, $shorturl );
647 * Get total number of URLs and sum of clicks. Input: optional "AND WHERE" clause. Returns array
650 function yourls_get_db_stats( $where = '' ) {
652 $table_url = YOURLS_DB_TABLE_URL;
654 $totals = $ydb->get_row( "SELECT COUNT(keyword) as count, SUM(clicks) as sum FROM `$table_url` WHERE 1=1 $where" );
655 $return = array( 'total_links' => $totals->count, 'total_clicks' => $totals->sum );
657 return yourls_apply_filter( 'get_db_stats', $return, $where );
661 * Get number of SQL queries performed
664 function yourls_get_num_queries() {
667 return yourls_apply_filter( 'get_num_queries', $ydb->num_queries );
671 * Returns a sanitized a user agent string. Given what I found on http://www.user-agents.org/ it should be OK.
674 function yourls_get_user_agent() {
675 if ( !isset( $_SERVER['HTTP_USER_AGENT'] ) )
678 $ua = strip_tags( html_entity_decode( $_SERVER['HTTP_USER_AGENT'] ));
679 $ua = preg_replace('![^0-9a-zA-Z\':., /{}\(\)\[\]\+@&\!\?;_\-=~\*\#]!', '', $ua );
681 return yourls_apply_filter( 'get_user_agent', substr( $ua, 0, 254 ) );
685 * Redirect to another page
688 function yourls_redirect( $location, $code = 301 ) {
689 yourls_do_action( 'pre_redirect', $location, $code );
690 $location = yourls_apply_filter( 'redirect_location', $location, $code );
691 $code = yourls_apply_filter( 'redirect_code', $code, $location );
692 // Redirect, either properly if possible, or via Javascript otherwise
693 if( !headers_sent() ) {
694 yourls_status_header( $code );
695 header( "Location: $location" );
697 yourls_redirect_javascript( $location );
703 * Set HTTP status header
706 function yourls_status_header( $code = 200 ) {
710 $protocol = $_SERVER["SERVER_PROTOCOL"];
711 if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
712 $protocol = 'HTTP/1.0';
714 $code = intval( $code );
715 $desc = yourls_get_HTTP_status( $code );
717 @header ("$protocol $code $desc"); // This causes problems on IIS and some FastCGI setups
718 yourls_do_action( 'status_header', $code );
722 * Redirect to another page using Javascript. Set optional (bool)$dontwait to false to force manual redirection (make sure a message has been read by user)
725 function yourls_redirect_javascript( $location, $dontwait = true ) {
726 yourls_do_action( 'pre_redirect_javascript', $location, $dontwait );
727 $location = yourls_apply_filter( 'redirect_javascript', $location, $dontwait );
729 $message = yourls_s( 'if you are not redirected after 10 seconds, please <a href="%s">click here</a>', $location );
731 <script type="text/javascript">
732 window.location="$location";
734 <small>($message)</small>
737 echo '<p>' . yourls_s( 'Please <a href="%s">click here</a>', $location ) . '</p>';
739 yourls_do_action( 'post_redirect_javascript', $location );
743 * Return a HTTP status code
746 function yourls_get_HTTP_status( $code ) {
747 $code = intval( $code );
748 $headers_desc = array(
750 101 => 'Switching Protocols',
756 203 => 'Non-Authoritative Information',
758 205 => 'Reset Content',
759 206 => 'Partial Content',
760 207 => 'Multi-Status',
763 300 => 'Multiple Choices',
764 301 => 'Moved Permanently',
767 304 => 'Not Modified',
770 307 => 'Temporary Redirect',
772 400 => 'Bad Request',
773 401 => 'Unauthorized',
774 402 => 'Payment Required',
777 405 => 'Method Not Allowed',
778 406 => 'Not Acceptable',
779 407 => 'Proxy Authentication Required',
780 408 => 'Request Timeout',
783 411 => 'Length Required',
784 412 => 'Precondition Failed',
785 413 => 'Request Entity Too Large',
786 414 => 'Request-URI Too Long',
787 415 => 'Unsupported Media Type',
788 416 => 'Requested Range Not Satisfiable',
789 417 => 'Expectation Failed',
790 422 => 'Unprocessable Entity',
792 424 => 'Failed Dependency',
793 426 => 'Upgrade Required',
795 500 => 'Internal Server Error',
796 501 => 'Not Implemented',
797 502 => 'Bad Gateway',
798 503 => 'Service Unavailable',
799 504 => 'Gateway Timeout',
800 505 => 'HTTP Version Not Supported',
801 506 => 'Variant Also Negotiates',
802 507 => 'Insufficient Storage',
803 510 => 'Not Extended'
806 if ( isset( $headers_desc[$code] ) )
807 return $headers_desc[$code];
814 * Log a redirect (for stats)
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_sanitize_string( $keyword );
830 $referrer = ( isset( $_SERVER['HTTP_REFERER'] ) ? yourls_sanitize_url( $_SERVER['HTTP_REFERER'] ) : 'direct' );
831 $ua = yourls_get_user_agent();
832 $ip = yourls_get_IP();
833 $location = 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 function yourls_geo_ip_to_countrycode( $ip = '', $default = '' ) {
851 // Allow plugins to short-circuit the Geo IP API
852 $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
853 if ( false !== $location )
856 if ( !file_exists( YOURLS_INC.'/geo/GeoIP.dat') || !file_exists( YOURLS_INC.'/geo/geoip.inc') )
860 $ip = yourls_get_IP();
862 require_once( YOURLS_INC.'/geo/geoip.inc') ;
863 $gi = geoip_open( YOURLS_INC.'/geo/GeoIP.dat', GEOIP_STANDARD);
864 $location = geoip_country_code_by_addr($gi, $ip);
867 return yourls_apply_filter( 'geo_ip_to_countrycode', $location, $ip, $default );
871 * Converts a 2 letter country code to long name (ie AU -> Australia)
874 function yourls_geo_countrycode_to_countryname( $code ) {
875 // Allow plugins to short-circuit the Geo IP API
876 $country = yourls_apply_filter( 'shunt_geo_countrycode_to_countryname', false, $code );
877 if ( false !== $country )
880 // Load the Geo class if not already done
881 if( !class_exists( 'GeoIP', false ) ) {
882 $temp = yourls_geo_ip_to_countrycode( '127.0.0.1' );
885 if( class_exists( 'GeoIP', false ) ) {
887 $id = $geo->GEOIP_COUNTRY_CODE_TO_NUMBER[ $code ];
888 $long = $geo->GEOIP_COUNTRY_NAMES[ $id ];
896 * Return flag URL from 2 letter country code
899 function yourls_geo_get_flag( $code ) {
900 if( file_exists( YOURLS_INC.'/geo/flags/flag_'.strtolower($code).'.gif' ) ) {
901 $img = yourls_match_current_protocol( YOURLS_SITE.'/includes/geo/flags/flag_'.( strtolower( $code ) ).'.gif' );
905 return yourls_apply_filter( 'geo_get_flag', $img, $code );
910 * Check if an upgrade is needed
913 function yourls_upgrade_is_needed() {
914 // check YOURLS_DB_VERSION exist && match values stored in YOURLS_DB_TABLE_OPTIONS
915 list( $currentver, $currentsql ) = yourls_get_current_version_from_sql();
916 if( $currentsql < YOURLS_DB_VERSION )
923 * Get current version & db version as stored in the options DB. Prior to 1.4 there's no option table.
926 function yourls_get_current_version_from_sql() {
927 $currentver = yourls_get_option( 'version' );
928 $currentsql = yourls_get_option( 'db_version' );
930 // Values if version is 1.3
936 return array( $currentver, $currentsql);
940 * Read an option from DB (or from cache if available). Return value or $default if not found
943 function yourls_get_option( $option_name, $default = false ) {
946 // Allow plugins to short-circuit options
947 $pre = yourls_apply_filter( 'shunt_option_'.$option_name, false );
948 if ( false !== $pre )
951 // If option not cached already, get its value from the DB
952 if ( !isset( $ydb->option[$option_name] ) ) {
953 $table = YOURLS_DB_TABLE_OPTIONS;
954 $option_name = yourls_escape( $option_name );
955 $row = $ydb->get_row( "SELECT `option_value` FROM `$table` WHERE `option_name` = '$option_name' LIMIT 1" );
956 if ( is_object( $row) ) { // Has to be get_row instead of get_var because of funkiness with 0, false, null values
957 $value = $row->option_value;
958 } else { // option does not exist, so we must cache its non-existence
961 $ydb->option[ $option_name ] = yourls_maybe_unserialize( $value );
964 return yourls_apply_filter( 'get_option_'.$option_name, $ydb->option[$option_name] );
968 * Read all options from DB at once
971 function yourls_get_all_options() {
974 // Allow plugins to short-circuit all options. (Note: regular plugins are loaded after all options)
975 $pre = yourls_apply_filter( 'shunt_all_options', false );
976 if ( false !== $pre )
979 $table = YOURLS_DB_TABLE_OPTIONS;
981 $allopt = $ydb->get_results( "SELECT `option_name`, `option_value` FROM `$table` WHERE 1=1" );
983 foreach( (array)$allopt as $option ) {
984 $ydb->option[$option->option_name] = yourls_maybe_unserialize( $option->option_value );
987 $ydb->option = yourls_apply_filter( 'get_all_options', $ydb->option );
991 * Update (add if doesn't exist) an option to DB
994 function yourls_update_option( $option_name, $newvalue ) {
996 $table = YOURLS_DB_TABLE_OPTIONS;
998 $safe_option_name = yourls_escape( $option_name );
1000 $oldvalue = yourls_get_option( $safe_option_name );
1002 // If the new and old values are the same, no need to update.
1003 if ( $newvalue === $oldvalue )
1006 if ( false === $oldvalue ) {
1007 yourls_add_option( $option_name, $newvalue );
1011 $_newvalue = yourls_escape( yourls_maybe_serialize( $newvalue ) );
1013 yourls_do_action( 'update_option', $option_name, $oldvalue, $newvalue );
1015 $ydb->query( "UPDATE `$table` SET `option_value` = '$_newvalue' WHERE `option_name` = '$option_name'" );
1017 if ( $ydb->rows_affected == 1 ) {
1018 $ydb->option[ $option_name ] = $newvalue;
1025 * Add an option to the DB
1028 function yourls_add_option( $name, $value = '' ) {
1030 $table = YOURLS_DB_TABLE_OPTIONS;
1031 $safe_name = yourls_escape( $name );
1033 // Make sure the option doesn't already exist
1034 if ( false !== yourls_get_option( $safe_name ) )
1037 $_value = yourls_escape( yourls_maybe_serialize( $value ) );
1039 yourls_do_action( 'add_option', $safe_name, $_value );
1041 $ydb->query( "INSERT INTO `$table` (`option_name`, `option_value`) VALUES ('$name', '$_value')" );
1042 $ydb->option[ $name ] = $value;
1048 * Delete an option from the DB
1051 function yourls_delete_option( $name ) {
1053 $table = YOURLS_DB_TABLE_OPTIONS;
1054 $name = yourls_escape( $name );
1056 // Get the ID, if no ID then return
1057 $option = $ydb->get_row( "SELECT option_id FROM `$table` WHERE `option_name` = '$name'" );
1058 if ( is_null( $option ) || !$option->option_id )
1061 yourls_do_action( 'delete_option', $option_name );
1063 $ydb->query( "DELETE FROM `$table` WHERE `option_name` = '$name'" );
1070 * Serialize data if needed. Stolen from WordPress
1073 function yourls_maybe_serialize( $data ) {
1074 if ( is_array( $data ) || is_object( $data ) )
1075 return serialize( $data );
1077 if ( yourls_is_serialized( $data ) )
1078 return serialize( $data );
1084 * Check value to find if it was serialized. Stolen from WordPress
1087 function yourls_is_serialized( $data ) {
1088 // if it isn't a string, it isn't serialized
1089 if ( !is_string( $data ) )
1091 $data = trim( $data );
1092 if ( 'N;' == $data )
1094 if ( !preg_match( '/^([adObis]):/', $data, $badions ) )
1096 switch ( $badions[1] ) {
1100 if ( preg_match( "/^{$badions[1]}:[0-9]+:.*[;}]\$/s", $data ) )
1106 if ( preg_match( "/^{$badions[1]}:[0-9.E-]+;\$/", $data ) )
1114 * Unserialize value only if it was serialized. Stolen from WP
1117 function yourls_maybe_unserialize( $original ) {
1118 if ( yourls_is_serialized( $original ) ) // don't attempt to unserialize data that wasn't serialized going in
1119 return @unserialize( $original );
1124 * Determine if the current page is private
1127 function yourls_is_private() {
1130 if ( defined('YOURLS_PRIVATE') && YOURLS_PRIVATE == true ) {
1132 // Allow overruling for particular pages:
1135 if( yourls_is_API() ) {
1136 if( !defined('YOURLS_PRIVATE_API') || YOURLS_PRIVATE_API != false )
1140 } elseif( yourls_is_infos() ) {
1141 if( !defined('YOURLS_PRIVATE_INFOS') || YOURLS_PRIVATE_INFOS !== false )
1151 return yourls_apply_filter( 'is_private', $private );
1155 * Show login form if required
1158 function yourls_maybe_require_auth() {
1159 if( yourls_is_private() ) {
1160 yourls_do_action( 'require_auth' );
1161 require_once( YOURLS_INC.'/auth.php' );
1163 yourls_do_action( 'require_no_auth' );
1168 * Allow several short URLs for the same long URL ?
1171 function yourls_allow_duplicate_longurls() {
1172 // special treatment if API to check for WordPress plugin requests
1173 if( yourls_is_API() ) {
1174 if ( isset($_REQUEST['source']) && $_REQUEST['source'] == 'plugin' )
1177 return ( defined( 'YOURLS_UNIQUE_URLS' ) && YOURLS_UNIQUE_URLS == false );
1181 * Return list of all shorturls associated to the same long URL. Returns NULL or array of keywords.
1184 function yourls_get_duplicate_keywords( $longurl ) {
1185 if( !yourls_allow_duplicate_longurls() )
1189 $longurl = yourls_escape( yourls_sanitize_url($longurl) );
1190 $table = YOURLS_DB_TABLE_URL;
1192 $return = $ydb->get_col( "SELECT `keyword` FROM `$table` WHERE `url` = '$longurl'" );
1193 return yourls_apply_filter( 'get_duplicate_keywords', $return, $longurl );
1197 * Check if an IP shortens URL too fast to prevent DB flood. Return true, or die.
1200 function yourls_check_IP_flood( $ip = '' ) {
1202 // Allow plugins to short-circuit the whole function
1203 $pre = yourls_apply_filter( 'shunt_check_IP_flood', false, $ip );
1204 if ( false !== $pre )
1207 yourls_do_action( 'pre_check_ip_flood', $ip ); // at this point $ip can be '', check it if your plugin hooks in here
1210 ( defined('YOURLS_FLOOD_DELAY_SECONDS') && YOURLS_FLOOD_DELAY_SECONDS === 0 ) ||
1211 !defined('YOURLS_FLOOD_DELAY_SECONDS')
1215 $ip = ( $ip ? yourls_sanitize_ip( $ip ) : yourls_get_IP() );
1217 // Don't throttle whitelist IPs
1218 if( defined( 'YOURLS_FLOOD_IP_WHITELIST' ) && YOURLS_FLOOD_IP_WHITELIST ) {
1219 $whitelist_ips = explode( ',', YOURLS_FLOOD_IP_WHITELIST );
1220 foreach( (array)$whitelist_ips as $whitelist_ip ) {
1221 $whitelist_ip = trim( $whitelist_ip );
1222 if ( $whitelist_ip == $ip )
1227 // Don't throttle logged in users
1228 if( yourls_is_private() ) {
1229 if( yourls_is_valid_user() === true )
1233 yourls_do_action( 'check_ip_flood', $ip );
1236 $table = YOURLS_DB_TABLE_URL;
1238 $lasttime = $ydb->get_var( "SELECT `timestamp` FROM $table WHERE `ip` = '$ip' ORDER BY `timestamp` DESC LIMIT 1" );
1241 $then = date( 'U', strtotime( $lasttime ) );
1242 if( ( $now - $then ) <= YOURLS_FLOOD_DELAY_SECONDS ) {
1244 yourls_do_action( 'ip_flood', $ip, $now - $then );
1245 yourls_die( yourls__( 'Too many URLs added too fast. Slow down please.' ), yourls__( 'Forbidden' ), 403 );
1253 * Check if YOURLS is installing
1258 function yourls_is_installing() {
1259 $installing = defined( 'YOURLS_INSTALLING' ) && YOURLS_INSTALLING == true;
1260 return yourls_apply_filter( 'is_installing', $installing );
1264 * Check if YOURLS is upgrading
1269 function yourls_is_upgrading() {
1270 $upgrading = defined( 'YOURLS_UPGRADING' ) && YOURLS_UPGRADING == true;
1271 return yourls_apply_filter( 'is_upgrading', $upgrading );
1276 * Check if YOURLS is installed
1279 function yourls_is_installed() {
1280 static $is_installed = false;
1281 if ( $is_installed === false ) {
1282 $check_14 = $check_13 = false;
1284 if( defined('YOURLS_DB_TABLE_NEXTDEC') )
1285 $check_13 = $ydb->get_var('SELECT `next_id` FROM '.YOURLS_DB_TABLE_NEXTDEC);
1286 $check_14 = yourls_get_option( 'version' );
1287 $is_installed = $check_13 || $check_14;
1289 return yourls_apply_filter( 'is_installed', $is_installed );
1293 * Generate random string of (int)$length length and type $type (see function for details)
1296 function yourls_rnd_string ( $length = 5, $type = 0, $charlist = '' ) {
1298 $length = intval( $length );
1300 // define possible characters
1303 // custom char list, or comply to charset as defined in config
1305 $possible = $charlist ? $charlist : yourls_get_shorturl_charset() ;
1308 // no vowels to make no offending word, no 0/1/o/l to avoid confusion between letters & digits. Perfect for passwords.
1310 $possible = "23456789bcdfghjkmnpqrstvwxyz";
1313 // Same, with lower + upper
1315 $possible = "23456789bcdfghjkmnpqrstvwxyzBCDFGHJKMNPQRSTVWXYZ";
1318 // all letters, lowercase
1320 $possible = "abcdefghijklmnopqrstuvwxyz";
1323 // all letters, lowercase + uppercase
1325 $possible = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1328 // all digits & letters lowercase
1330 $possible = "0123456789abcdefghijklmnopqrstuvwxyz";
1333 // all digits & letters lowercase + uppercase
1335 $possible = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1341 while ($i < $length) {
1342 $str .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
1346 return yourls_apply_filter( 'rnd_string', $str, $length, $type, $charlist );
1350 * Return salted string
1353 function yourls_salt( $string ) {
1354 $salt = defined('YOURLS_COOKIEKEY') ? YOURLS_COOKIEKEY : md5(__FILE__) ;
1355 return yourls_apply_filter( 'yourls_salt', md5 ($string . $salt), $string );
1359 * Add a query var to a URL and return URL. Completely stolen from WP.
1361 * Works with one of these parameter patterns:
1362 * array( 'var' => 'value' )
1363 * array( 'var' => 'value' ), $url
1365 * 'var', 'value', $url
1366 * If $url ommited, uses $_SERVER['REQUEST_URI']
1369 function yourls_add_query_arg() {
1371 if ( is_array( func_get_arg(0) ) ) {
1372 if ( @func_num_args() < 2 || false === @func_get_arg( 1 ) )
1373 $uri = $_SERVER['REQUEST_URI'];
1375 $uri = @func_get_arg( 1 );
1377 if ( @func_num_args() < 3 || false === @func_get_arg( 2 ) )
1378 $uri = $_SERVER['REQUEST_URI'];
1380 $uri = @func_get_arg( 2 );
1383 $uri = str_replace( '&', '&', $uri );
1386 if ( $frag = strstr( $uri, '#' ) )
1387 $uri = substr( $uri, 0, -strlen( $frag ) );
1391 if ( preg_match( '|^https?://|i', $uri, $matches ) ) {
1392 $protocol = $matches[0];
1393 $uri = substr( $uri, strlen( $protocol ) );
1398 if ( strpos( $uri, '?' ) !== false ) {
1399 $parts = explode( '?', $uri, 2 );
1400 if ( 1 == count( $parts ) ) {
1404 $base = $parts[0] . '?';
1407 } elseif ( !empty( $protocol ) || strpos( $uri, '=' ) === false ) {
1415 parse_str( $query, $qs );
1416 $qs = yourls_urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
1417 if ( is_array( func_get_arg( 0 ) ) ) {
1418 $kayvees = func_get_arg( 0 );
1419 $qs = array_merge( $qs, $kayvees );
1421 $qs[func_get_arg( 0 )] = func_get_arg( 1 );
1424 foreach ( (array) $qs as $k => $v ) {
1429 $ret = http_build_query( $qs );
1430 $ret = trim( $ret, '?' );
1431 $ret = preg_replace( '#=(&|$)#', '$1', $ret );
1432 $ret = $protocol . $base . $ret . $frag;
1433 $ret = rtrim( $ret, '?' );
1438 * Navigates through an array and encodes the values to be used in a URL. Stolen from WP, used in yourls_add_query_arg()
1441 function yourls_urlencode_deep( $value ) {
1442 $value = is_array( $value ) ? array_map( 'yourls_urlencode_deep', $value ) : urlencode( $value );
1447 * Remove arg from query. Opposite of yourls_add_query_arg. Stolen from WP.
1450 function yourls_remove_query_arg( $key, $query = false ) {
1451 if ( is_array( $key ) ) { // removing multiple keys
1452 foreach ( $key as $k )
1453 $query = yourls_add_query_arg( $k, false, $query );
1456 return yourls_add_query_arg( $key, false, $query );
1460 * Return a time-dependent string for nonce creation
1463 function yourls_tick() {
1464 return ceil( time() / YOURLS_NONCE_LIFE );
1468 * Create a time limited, action limited and user limited token
1471 function yourls_create_nonce( $action, $user = false ) {
1472 if( false == $user )
1473 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1474 $tick = yourls_tick();
1475 return substr( yourls_salt($tick . $action . $user), 0, 10 );
1479 * Create a nonce field for inclusion into a form
1482 function yourls_nonce_field( $action, $name = 'nonce', $user = false, $echo = true ) {
1483 $field = '<input type="hidden" id="'.$name.'" name="'.$name.'" value="'.yourls_create_nonce( $action, $user ).'" />';
1490 * Add a nonce to a URL. If URL omitted, adds nonce to current URL
1493 function yourls_nonce_url( $action, $url = false, $name = 'nonce', $user = false ) {
1494 $nonce = yourls_create_nonce( $action, $user );
1495 return yourls_add_query_arg( $name, $nonce, $url );
1499 * Check validity of a nonce (ie time span, user and action match).
1501 * Returns true if valid, dies otherwise (yourls_die() or die($return) if defined)
1502 * if $nonce is false or unspecified, it will use $_REQUEST['nonce']
1505 function yourls_verify_nonce( $action, $nonce = false, $user = false, $return = '' ) {
1507 if( false == $user )
1508 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1510 // get current nonce value
1511 if( false == $nonce && isset( $_REQUEST['nonce'] ) )
1512 $nonce = $_REQUEST['nonce'];
1514 // what nonce should be
1515 $valid = yourls_create_nonce( $action, $user );
1517 if( $nonce == $valid ) {
1522 yourls_die( yourls__( 'Unauthorized action or expired link' ), yourls__( 'Error' ), 403 );
1527 * Converts keyword into short link (prepend with YOURLS base URL)
1530 function yourls_link( $keyword = '' ) {
1531 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword );
1532 return yourls_apply_filter( 'yourls_link', $link, $keyword );
1536 * Converts keyword into stat link (prepend with YOURLS base URL, append +)
1539 function yourls_statlink( $keyword = '' ) {
1540 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword ) . '+';
1541 if( yourls_is_ssl() )
1542 $link = str_replace( 'http://', 'https://', $link );
1543 return yourls_apply_filter( 'yourls_statlink', $link, $keyword );
1547 * Check if we're in API mode. Returns bool
1550 function yourls_is_API() {
1551 if ( defined( 'YOURLS_API' ) && YOURLS_API == true )
1557 * Check if we're in Ajax mode. Returns bool
1560 function yourls_is_Ajax() {
1561 if ( defined( 'YOURLS_AJAX' ) && YOURLS_AJAX == true )
1567 * Check if we're in GO mode (yourls-go.php). Returns bool
1570 function yourls_is_GO() {
1571 if ( defined( 'YOURLS_GO' ) && YOURLS_GO == true )
1577 * Check if we're displaying stats infos (yourls-infos.php). Returns bool
1580 function yourls_is_infos() {
1581 if ( defined( 'YOURLS_INFOS' ) && YOURLS_INFOS == true )
1587 * Check if we'll need interface display function (ie not API or redirection)
1590 function yourls_has_interface() {
1591 if( yourls_is_API() or yourls_is_GO() )
1597 * Check if we're in the admin area. Returns bool
1600 function yourls_is_admin() {
1601 if ( defined( 'YOURLS_ADMIN' ) && YOURLS_ADMIN == true )
1607 * Check if the server seems to be running on Windows. Not exactly sure how reliable this is.
1610 function yourls_is_windows() {
1611 return defined( 'DIRECTORY_SEPARATOR' ) && DIRECTORY_SEPARATOR == '\\';
1615 * Check if SSL is required. Returns bool.
1618 function yourls_needs_ssl() {
1619 if ( defined('YOURLS_ADMIN_SSL') && YOURLS_ADMIN_SSL == true )
1625 * Return admin link, with SSL preference if applicable.
1628 function yourls_admin_url( $page = '' ) {
1629 $admin = YOURLS_SITE . '/admin/' . $page;
1630 if( yourls_is_ssl() or yourls_needs_ssl() )
1631 $admin = str_replace('http://', 'https://', $admin);
1632 return yourls_apply_filter( 'admin_url', $admin, $page );
1636 * Return YOURLS_SITE or URL under YOURLS setup, with SSL preference
1639 function yourls_site_url( $echo = true, $url = '' ) {
1640 $url = yourls_get_relative_url( $url );
1641 $url = trim( YOURLS_SITE . '/' . $url, '/' );
1643 // Do not enforce (checking yourls_need_ssl() ) but check current usage so it won't force SSL on non-admin pages
1644 if( yourls_is_ssl() )
1645 $url = str_replace( 'http://', 'https://', $url );
1646 $url = yourls_apply_filter( 'site_url', $url );
1653 * Check if SSL is used, returns bool. Stolen from WP.
1656 function yourls_is_ssl() {
1658 if ( isset( $_SERVER['HTTPS'] ) ) {
1659 if ( 'on' == strtolower( $_SERVER['HTTPS'] ) )
1661 if ( '1' == $_SERVER['HTTPS'] )
1663 } elseif ( isset( $_SERVER['SERVER_PORT'] ) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
1666 return yourls_apply_filter( 'is_ssl', $is_ssl );
1671 * Get a remote page <title>, return a string (either title or url)
1674 function yourls_get_remote_title( $url ) {
1675 // Allow plugins to short-circuit the whole function
1676 $pre = yourls_apply_filter( 'shunt_get_remote_title', false, $url );
1677 if ( false !== $pre )
1680 require_once( YOURLS_INC.'/functions-http.php' );
1682 $url = yourls_sanitize_url( $url );
1684 $title = $charset = false;
1686 $content = yourls_get_remote_content( $url );
1688 // If false, return url as title.
1689 // Todo: improve this with temporary title when shorturl_meta available?
1690 if( false === $content )
1693 if( $content !== false ) {
1695 if ( preg_match('/<title>(.*?)<\/title>/is', $content, $found ) ) {
1701 // <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
1702 if ( preg_match('/<meta[^>]*?charset=([^>]*?)\/?>/is', $content, $found ) ) {
1703 $charset = trim($found[1], '"\' ');
1708 // if title not found, guess if returned content was actually an error message
1709 if( $title == false && strpos( $content, 'Error' ) === 0 ) {
1713 if( $title == false )
1717 if( !yourls_seems_utf8( $title ) )
1718 $title = utf8_encode( $title );
1721 // Charset conversion. We use @ to remove warnings (mb_ functions are easily bitching about illegal chars)
1722 if( function_exists( 'mb_convert_encoding' ) ) {
1724 $title = @mb_convert_encoding( $title, 'UTF-8', $charset );
1726 $title = @mb_convert_encoding( $title, 'UTF-8' );
1730 // Remove HTML entities
1731 $title = html_entity_decode( $title, ENT_QUOTES, 'UTF-8' );
1733 // Strip out evil things
1734 $title = yourls_sanitize_title( $title );
1736 return yourls_apply_filter( 'get_remote_title', $title, $url );
1740 * Quick UA check for mobile devices. Return boolean.
1743 function yourls_is_mobile_device() {
1746 'android', 'blackberry', 'blazer',
1747 'compal', 'elaine', 'fennec', 'hiptop',
1748 'iemobile', 'iphone', 'ipod', 'ipad',
1749 'iris', 'kindle', 'opera mobi', 'opera mini',
1750 'palm', 'phone', 'pocket', 'psp', 'symbian',
1751 'treo', 'wap', 'windows ce', 'windows phone'
1754 // Current user-agent
1755 $current = strtolower( $_SERVER['HTTP_USER_AGENT'] );
1758 $is_mobile = ( str_replace( $mobiles, '', $current ) != $current );
1759 return yourls_apply_filter( 'is_mobile_device', $is_mobile );
1763 * Get request in YOURLS base (eg in 'http://site.com/yourls/abcd' get 'abdc')
1766 function yourls_get_request() {
1767 // Allow plugins to short-circuit the whole function
1768 $pre = yourls_apply_filter( 'shunt_get_request', false );
1769 if ( false !== $pre )
1772 static $request = null;
1774 yourls_do_action( 'pre_get_request', $request );
1776 if( $request !== null )
1779 // Ignore protocol & www. prefix
1780 $root = str_replace( array( 'https://', 'http://', 'https://www.', 'http://www.' ), '', YOURLS_SITE );
1781 // Case insensitive comparison of the YOURLS root to match both http://Sho.rt/blah and http://sho.rt/blah
1782 $request = preg_replace( "!$root/!i", '', $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 1 );
1784 // Unless request looks like a full URL (ie request is a simple keyword) strip query string
1785 if( !preg_match( "@^[a-zA-Z]+://.+@", $request ) ) {
1786 $request = current( explode( '?', $request ) );
1789 return yourls_apply_filter( 'get_request', $request );
1793 * Change protocol to match current scheme used (http or https)
1796 function yourls_match_current_protocol( $url, $normal = 'http', $ssl = 'https' ) {
1797 if( yourls_is_ssl() )
1798 $url = str_replace( $normal, $ssl, $url );
1799 return yourls_apply_filter( 'match_current_protocol', $url );
1803 * Fix $_SERVER['REQUEST_URI'] variable for various setups. Stolen from WP.
1806 function yourls_fix_request_uri() {
1808 $default_server_values = array(
1809 'SERVER_SOFTWARE' => '',
1810 'REQUEST_URI' => '',
1812 $_SERVER = array_merge( $default_server_values, $_SERVER );
1814 // Fix for IIS when running with PHP ISAPI
1815 if ( empty( $_SERVER['REQUEST_URI'] ) || ( php_sapi_name() != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
1818 if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
1819 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
1821 // IIS Isapi_Rewrite
1822 else if ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
1823 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
1825 // Use ORIG_PATH_INFO if there is no PATH_INFO
1826 if ( !isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) )
1827 $_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
1829 // Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
1830 if ( isset( $_SERVER['PATH_INFO'] ) ) {
1831 if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
1832 $_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
1834 $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
1837 // Append the query string if it exists and isn't null
1838 if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
1839 $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
1846 * Shutdown function, runs just before PHP shuts down execution. Stolen from WP
1849 function yourls_shutdown() {
1850 yourls_do_action( 'shutdown' );
1854 * Auto detect custom favicon in /user directory, fallback to YOURLS favicon, and echo/return its URL
1857 function yourls_favicon( $echo = true ) {
1858 static $favicon = null;
1859 if( $favicon !== null )
1863 // search for favicon.(gif|ico|png|jpg|svg)
1864 foreach( array( 'gif', 'ico', 'png', 'jpg', 'svg' ) as $ext ) {
1865 if( file_exists( YOURLS_USERDIR. '/favicon.' . $ext ) ) {
1866 $custom = 'favicon.' . $ext;
1872 $favicon = yourls_site_url( false, YOURLS_USERURL . '/' . $custom );
1874 $favicon = yourls_site_url( false ) . '/images/favicon.gif';
1882 * Check for maintenance mode. If yes, die. See yourls_maintenance_mode(). Stolen from WP.
1885 function yourls_check_maintenance_mode() {
1887 $file = YOURLS_ABSPATH . '/.maintenance' ;
1888 if ( !file_exists( $file ) || yourls_is_upgrading() || yourls_is_installing() )
1891 global $maintenance_start;
1894 // If the $maintenance_start timestamp is older than 10 minutes, don't die.
1895 if ( ( time() - $maintenance_start ) >= 600 )
1898 // Use any /user/maintenance.php file
1899 if( file_exists( YOURLS_USERDIR.'/maintenance.php' ) ) {
1900 include( YOURLS_USERDIR.'/maintenance.php' );
1904 // https://www.youtube.com/watch?v=Xw-m4jEY-Ns
1905 $title = yourls__( 'Service temporarily unavailable' );
1906 $message = yourls__( 'Our service is currently undergoing scheduled maintenance.' ) . "</p>\n<p>" .
1907 yourls__( 'Things should not last very long, thank you for your patience and please excuse the inconvenience' );
1908 yourls_die( $message, $title , 503 );
1913 * Return current admin page, or null if not an admin page
1915 * @return mixed string if admin page, null if not an admin page
1918 function yourls_current_admin_page() {
1919 if( yourls_is_admin() ) {
1920 $current = substr( yourls_get_request(), 6 );
1921 if( $current === false )
1922 $current = 'index.php'; // if current page is http://sho.rt/admin/ instead of http://sho.rt/admin/index.php
1930 * Check if a URL protocol is allowed
1932 * Checks a URL against a list of whitelisted protocols. Protocols must be defined with
1933 * their complete scheme name, ie 'stuff:' or 'stuff://' (for instance, 'mailto:' is a valid
1934 * protocol, 'mailto://' isn't, and 'http:' with no double slashed isn't either
1938 * @param string $url URL to be check
1939 * @param array $protocols Optional. Array of protocols, defaults to global $yourls_allowedprotocols
1940 * @return boolean true if protocol allowed, false otherwise
1942 function yourls_is_allowed_protocol( $url, $protocols = array() ) {
1943 if( ! $protocols ) {
1944 global $yourls_allowedprotocols;
1945 $protocols = $yourls_allowedprotocols;
1948 $protocol = yourls_get_protocol( $url );
1949 return yourls_apply_filter( 'is_allowed_protocol', in_array( $protocol, $protocols ), $url, $protocols );
1953 * Get protocol from a URL (eg mailto:, http:// ...)
1957 * @param string $url URL to be check
1958 * @return string Protocol, with slash slash if applicable. Empty string if no protocol
1960 function yourls_get_protocol( $url ) {
1961 preg_match( '!^[a-zA-Z0-9\+\.-]+:(//)?!', $url, $matches );
1963 http://en.wikipedia.org/wiki/URI_scheme#Generic_syntax
1964 The scheme name consists of a sequence of characters beginning with a letter and followed by any
1965 combination of letters, digits, plus ("+"), period ("."), or hyphen ("-"). Although schemes are
1966 case-insensitive, the canonical form is lowercase and documents that specify schemes must do so
1967 with lowercase letters. It is followed by a colon (":").
1969 $protocol = ( isset( $matches[0] ) ? $matches[0] : '' );
1970 return yourls_apply_filter( 'get_protocol', $protocol, $url );
1974 * Get relative URL (eg 'abc' from 'http://sho.rt/abc')
1976 * Treat indifferently http & https. If a URL isn't relative to the YOURLS install, return it as is
1977 * or return empty string if $strict is true
1980 * @param string $url URL to relativize
1981 * @param bool $strict if true and if URL isn't relative to YOURLS install, return empty string
1982 * @return string URL
1984 function yourls_get_relative_url( $url, $strict = true ) {
1985 $url = yourls_sanitize_url( $url );
1987 // Remove protocols to make it easier
1988 $noproto_url = str_replace( 'https:', 'http:', $url );
1989 $noproto_site = str_replace( 'https:', 'http:', YOURLS_SITE );
1991 // Trim URL from YOURLS root URL : if no modification made, URL wasn't relative
1992 $_url = str_replace( $noproto_site . '/', '', $noproto_url );
1993 if( $_url == $noproto_url )
1994 $_url = ( $strict ? '' : $url );
1996 return yourls_apply_filter( 'get_relative_url', $_url, $url );
2000 * Marks a function as deprecated and informs when it has been used. Stolen from WP.
2002 * There is a hook deprecated_function that will be called that can be used
2003 * to get the backtrace up to what file and function called the deprecated
2006 * The current behavior is to trigger a user error if YOURLS_DEBUG is true.
2008 * This function is to be used in every function that is deprecated.
2011 * @uses yourls_do_action() Calls 'deprecated_function' and passes the function name, what to use instead,
2012 * and the version the function was deprecated in.
2013 * @uses yourls_apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do
2014 * trigger or false to not trigger error.
2016 * @param string $function The function that was called
2017 * @param string $version The version of WordPress that deprecated the function
2018 * @param string $replacement Optional. The function that should have been called
2020 function yourls_deprecated_function( $function, $version, $replacement = null ) {
2022 yourls_do_action( 'deprecated_function', $function, $replacement, $version );
2024 // Allow plugin to filter the output error trigger
2025 if ( YOURLS_DEBUG && yourls_apply_filters( 'deprecated_function_trigger_error', true ) ) {
2026 if ( ! is_null( $replacement ) )
2027 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) );
2029 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
2034 * Return the value if not an empty string
2036 * Used with array_filter(), to remove empty keys but not keys with value 0 or false
2039 * @param mixed $val Value to test against ''
2040 * @return bool True if not an empty string
2042 function yourls_return_if_not_empty_string( $val ) {
2043 return( $val !== '' );