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 $keyword = yourls_sanitize_keyword( $keyword );
388 $table = YOURLS_DB_TABLE_URL;
389 $already_exists = $ydb->get_var( "SELECT COUNT(`keyword`) FROM `$table` WHERE `keyword` = '$keyword';" );
390 if ( $already_exists )
393 return yourls_apply_filter( 'keyword_is_taken', $taken, $keyword );
401 function yourls_db_connect() {
404 if ( !defined( 'YOURLS_DB_USER' )
405 or !defined( 'YOURLS_DB_PASS' )
406 or !defined( 'YOURLS_DB_NAME' )
407 or !defined( 'YOURLS_DB_HOST' )
408 or !class_exists( 'ezSQL_mysql' )
409 ) yourls_die ( yourls__( 'DB config missing, or could not find DB class' ), yourls__( 'Fatal error' ), 503 );
411 // Are we standalone or in the WordPress environment?
412 if ( class_exists( 'wpdb' ) ) {
413 $ydb = new wpdb( YOURLS_DB_USER, YOURLS_DB_PASS, YOURLS_DB_NAME, YOURLS_DB_HOST );
415 $ydb = new ezSQL_mysql( YOURLS_DB_USER, YOURLS_DB_PASS, YOURLS_DB_NAME, YOURLS_DB_HOST );
417 if ( $ydb->last_error )
418 yourls_die( $ydb->last_error, yourls__( 'Fatal error' ), 503 );
420 if ( defined( 'YOURLS_DEBUG' ) && YOURLS_DEBUG === true )
421 $ydb->show_errors = true;
430 function yourls_xml_encode( $array ) {
431 require_once( YOURLS_INC.'/functions-xml.php' );
432 $converter= new yourls_array2xml;
433 return $converter->array2xml( $array );
437 * 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
440 function yourls_get_keyword_infos( $keyword, $use_cache = true ) {
442 $keyword = yourls_sanitize_string( $keyword );
444 yourls_do_action( 'pre_get_keyword', $keyword, $use_cache );
446 if( isset( $ydb->infos[$keyword] ) && $use_cache == true ) {
447 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
450 yourls_do_action( 'get_keyword_not_cached', $keyword );
452 $table = YOURLS_DB_TABLE_URL;
453 $infos = $ydb->get_row( "SELECT * FROM `$table` WHERE `keyword` = '$keyword'" );
456 $infos = (array)$infos;
457 $ydb->infos[ $keyword ] = $infos;
459 $ydb->infos[ $keyword ] = false;
462 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
466 * Return (string) selected information associated with a keyword. Optional $notfound = string default message if nothing found
469 function yourls_get_keyword_info( $keyword, $field, $notfound = false ) {
471 // Allow plugins to short-circuit the whole function
472 $pre = yourls_apply_filter( 'shunt_get_keyword_info', false, $keyword, $field, $notfound );
473 if ( false !== $pre )
476 $keyword = yourls_sanitize_string( $keyword );
477 $infos = yourls_get_keyword_infos( $keyword );
480 if ( isset( $infos[ $field ] ) && $infos[ $field ] !== false )
481 $return = $infos[ $field ];
483 return yourls_apply_filter( 'get_keyword_info', $return, $keyword, $field, $notfound );
487 * Return title associated with keyword. Optional $notfound = string default message if nothing found
490 function yourls_get_keyword_title( $keyword, $notfound = false ) {
491 return yourls_get_keyword_info( $keyword, 'title', $notfound );
495 * Return long URL associated with keyword. Optional $notfound = string default message if nothing found
498 function yourls_get_keyword_longurl( $keyword, $notfound = false ) {
499 return yourls_get_keyword_info( $keyword, 'url', $notfound );
503 * Return number of clicks on a keyword. Optional $notfound = string default message if nothing found
506 function yourls_get_keyword_clicks( $keyword, $notfound = false ) {
507 return yourls_get_keyword_info( $keyword, 'clicks', $notfound );
511 * Return IP that added a keyword. Optional $notfound = string default message if nothing found
514 function yourls_get_keyword_IP( $keyword, $notfound = false ) {
515 return yourls_get_keyword_info( $keyword, 'ip', $notfound );
519 * Return timestamp associated with a keyword. Optional $notfound = string default message if nothing found
522 function yourls_get_keyword_timestamp( $keyword, $notfound = false ) {
523 return yourls_get_keyword_info( $keyword, 'timestamp', $notfound );
527 * Update click count on a short URL. Return 0/1 for error/success.
530 function yourls_update_clicks( $keyword, $clicks = false ) {
531 // Allow plugins to short-circuit the whole function
532 $pre = yourls_apply_filter( 'shunt_update_clicks', false, $keyword, $clicks );
533 if ( false !== $pre )
537 $keyword = yourls_sanitize_string( $keyword );
538 $table = YOURLS_DB_TABLE_URL;
539 if ( $clicks !== false && is_int( $clicks ) && $clicks >= 0 )
540 $update = $ydb->query( "UPDATE `$table` SET `clicks` = $clicks WHERE `keyword` = '$keyword'" );
542 $update = $ydb->query( "UPDATE `$table` SET `clicks` = clicks + 1 WHERE `keyword` = '$keyword'" );
544 yourls_do_action( 'update_clicks', $keyword, $update, $clicks );
549 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
552 function yourls_get_stats( $filter = 'top', $limit = 10, $start = 0 ) {
561 $sort_by = 'timestamp';
562 $sort_order = 'desc';
572 $sort_order = 'desc';
577 $limit = intval( $limit );
578 $start = intval( $start );
581 $table_url = YOURLS_DB_TABLE_URL;
582 $results = $ydb->get_results( "SELECT * FROM `$table_url` WHERE 1=1 ORDER BY `$sort_by` $sort_order LIMIT $start, $limit;" );
587 foreach ( (array)$results as $res ) {
588 $return['links']['link_'.$i++] = array(
589 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
591 'title' => $res->title,
592 'timestamp'=> $res->timestamp,
594 'clicks' => $res->clicks,
599 $return['stats'] = yourls_get_db_stats();
601 $return['statusCode'] = 200;
603 return yourls_apply_filter( 'get_stats', $return, $filter, $limit, $start );
607 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
610 function yourls_get_link_stats( $shorturl ) {
613 $table_url = YOURLS_DB_TABLE_URL;
614 $res = $ydb->get_row( "SELECT * FROM `$table_url` WHERE keyword = '$shorturl';" );
621 'message' => 'Error: short URL not found',
626 'message' => 'success',
628 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
630 'title' => $res->title,
631 'timestamp'=> $res->timestamp,
633 'clicks' => $res->clicks,
638 return yourls_apply_filter( 'get_link_stats', $return, $shorturl );
642 * Get total number of URLs and sum of clicks. Input: optional "AND WHERE" clause. Returns array
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];
809 * Log a redirect (for stats)
812 function yourls_log_redirect( $keyword ) {
813 // Allow plugins to short-circuit the whole function
814 $pre = yourls_apply_filter( 'shunt_log_redirect', false, $keyword );
815 if ( false !== $pre )
818 if ( !yourls_do_log_redirect() )
822 $table = YOURLS_DB_TABLE_LOG;
824 $keyword = yourls_sanitize_string( $keyword );
825 $referrer = ( isset( $_SERVER['HTTP_REFERER'] ) ? yourls_sanitize_url( $_SERVER['HTTP_REFERER'] ) : 'direct' );
826 $ua = yourls_get_user_agent();
827 $ip = yourls_get_IP();
828 $location = yourls_geo_ip_to_countrycode( $ip );
830 return $ydb->query( "INSERT INTO `$table` (click_time, shorturl, referrer, user_agent, ip_address, country_code) VALUES (NOW(), '$keyword', '$referrer', '$ua', '$ip', '$location')" );
834 * Check if we want to not log redirects (for stats)
837 function yourls_do_log_redirect() {
838 return ( !defined( 'YOURLS_NOSTATS' ) || YOURLS_NOSTATS != true );
842 * Converts an IP to a 2 letter country code, using GeoIP database if available in includes/geo/
845 function yourls_geo_ip_to_countrycode( $ip = '', $default = '' ) {
846 // Allow plugins to short-circuit the Geo IP API
847 $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
848 if ( false !== $location )
851 if ( !file_exists( YOURLS_INC.'/geo/GeoIP.dat') || !file_exists( YOURLS_INC.'/geo/geoip.inc') )
855 $ip = yourls_get_IP();
857 require_once( YOURLS_INC.'/geo/geoip.inc') ;
858 $gi = geoip_open( YOURLS_INC.'/geo/GeoIP.dat', GEOIP_STANDARD);
859 $location = geoip_country_code_by_addr($gi, $ip);
862 return yourls_apply_filter( 'geo_ip_to_countrycode', $location, $ip, $default );
866 * Converts a 2 letter country code to long name (ie AU -> Australia)
869 function yourls_geo_countrycode_to_countryname( $code ) {
870 // Allow plugins to short-circuit the Geo IP API
871 $country = yourls_apply_filter( 'shunt_geo_countrycode_to_countryname', false, $code );
872 if ( false !== $country )
875 // Load the Geo class if not already done
876 if( !class_exists( 'GeoIP' ) ) {
877 $temp = yourls_geo_ip_to_countrycode( '127.0.0.1' );
880 if( class_exists( 'GeoIP' ) ) {
882 $id = $geo->GEOIP_COUNTRY_CODE_TO_NUMBER[ $code ];
883 $long = $geo->GEOIP_COUNTRY_NAMES[ $id ];
891 * Return flag URL from 2 letter country code
894 function yourls_geo_get_flag( $code ) {
895 if( file_exists( YOURLS_INC.'/geo/flags/flag_'.strtolower($code).'.gif' ) ) {
896 $img = yourls_match_current_protocol( YOURLS_SITE.'/includes/geo/flags/flag_'.( strtolower( $code ) ).'.gif' );
900 return yourls_apply_filter( 'geo_get_flag', $img, $code );
905 * Check if an upgrade is needed
908 function yourls_upgrade_is_needed() {
909 // check YOURLS_DB_VERSION exist && match values stored in YOURLS_DB_TABLE_OPTIONS
910 list( $currentver, $currentsql ) = yourls_get_current_version_from_sql();
911 if( $currentsql < YOURLS_DB_VERSION )
918 * Get current version & db version as stored in the options DB. Prior to 1.4 there's no option table.
921 function yourls_get_current_version_from_sql() {
922 $currentver = yourls_get_option( 'version' );
923 $currentsql = yourls_get_option( 'db_version' );
925 // Values if version is 1.3
931 return array( $currentver, $currentsql);
935 * Read an option from DB (or from cache if available). Return value or $default if not found
938 function yourls_get_option( $option_name, $default = false ) {
941 // Allow plugins to short-circuit options
942 $pre = yourls_apply_filter( 'shunt_option_'.$option_name, false );
943 if ( false !== $pre )
946 // If option not cached already, get its value from the DB
947 if ( !isset( $ydb->option[$option_name] ) ) {
948 $table = YOURLS_DB_TABLE_OPTIONS;
949 $option_name = yourls_escape( $option_name );
950 $row = $ydb->get_row( "SELECT `option_value` FROM `$table` WHERE `option_name` = '$option_name' LIMIT 1" );
951 if ( is_object( $row) ) { // Has to be get_row instead of get_var because of funkiness with 0, false, null values
952 $value = $row->option_value;
953 } else { // option does not exist, so we must cache its non-existence
956 $ydb->option[ $option_name ] = yourls_maybe_unserialize( $value );
959 return yourls_apply_filter( 'get_option_'.$option_name, $ydb->option[$option_name] );
963 * Read all options from DB at once
966 function yourls_get_all_options() {
969 // Allow plugins to short-circuit all options. (Note: regular plugins are loaded after all options)
970 $pre = yourls_apply_filter( 'shunt_all_options', false );
971 if ( false !== $pre )
974 $table = YOURLS_DB_TABLE_OPTIONS;
976 $allopt = $ydb->get_results( "SELECT `option_name`, `option_value` FROM `$table` WHERE 1=1" );
978 foreach( (array)$allopt as $option ) {
979 $ydb->option[$option->option_name] = yourls_maybe_unserialize( $option->option_value );
982 $ydb->option = yourls_apply_filter( 'get_all_options', $ydb->option );
986 * Update (add if doesn't exist) an option to DB
989 function yourls_update_option( $option_name, $newvalue ) {
991 $table = YOURLS_DB_TABLE_OPTIONS;
993 $safe_option_name = yourls_escape( $option_name );
995 $oldvalue = yourls_get_option( $safe_option_name );
997 // If the new and old values are the same, no need to update.
998 if ( $newvalue === $oldvalue )
1001 if ( false === $oldvalue ) {
1002 yourls_add_option( $option_name, $newvalue );
1006 $_newvalue = yourls_escape( yourls_maybe_serialize( $newvalue ) );
1008 yourls_do_action( 'update_option', $option_name, $oldvalue, $newvalue );
1010 $ydb->query( "UPDATE `$table` SET `option_value` = '$_newvalue' WHERE `option_name` = '$option_name'" );
1012 if ( $ydb->rows_affected == 1 ) {
1013 $ydb->option[ $option_name ] = $newvalue;
1020 * Add an option to the DB
1023 function yourls_add_option( $name, $value = '' ) {
1025 $table = YOURLS_DB_TABLE_OPTIONS;
1026 $safe_name = yourls_escape( $name );
1028 // Make sure the option doesn't already exist
1029 if ( false !== yourls_get_option( $safe_name ) )
1032 $_value = yourls_escape( yourls_maybe_serialize( $value ) );
1034 yourls_do_action( 'add_option', $safe_name, $_value );
1036 $ydb->query( "INSERT INTO `$table` (`option_name`, `option_value`) VALUES ('$name', '$_value')" );
1037 $ydb->option[ $name ] = $value;
1043 * Delete an option from the DB
1046 function yourls_delete_option( $name ) {
1048 $table = YOURLS_DB_TABLE_OPTIONS;
1049 $name = yourls_escape( $name );
1051 // Get the ID, if no ID then return
1052 $option = $ydb->get_row( "SELECT option_id FROM `$table` WHERE `option_name` = '$name'" );
1053 if ( is_null( $option ) || !$option->option_id )
1056 yourls_do_action( 'delete_option', $option_name );
1058 $ydb->query( "DELETE FROM `$table` WHERE `option_name` = '$name'" );
1065 * Serialize data if needed. Stolen from WordPress
1068 function yourls_maybe_serialize( $data ) {
1069 if ( is_array( $data ) || is_object( $data ) )
1070 return serialize( $data );
1072 if ( yourls_is_serialized( $data ) )
1073 return serialize( $data );
1079 * Check value to find if it was serialized. Stolen from WordPress
1082 function yourls_is_serialized( $data ) {
1083 // if it isn't a string, it isn't serialized
1084 if ( !is_string( $data ) )
1086 $data = trim( $data );
1087 if ( 'N;' == $data )
1089 if ( !preg_match( '/^([adObis]):/', $data, $badions ) )
1091 switch ( $badions[1] ) {
1095 if ( preg_match( "/^{$badions[1]}:[0-9]+:.*[;}]\$/s", $data ) )
1101 if ( preg_match( "/^{$badions[1]}:[0-9.E-]+;\$/", $data ) )
1109 * Unserialize value only if it was serialized. Stolen from WP
1112 function yourls_maybe_unserialize( $original ) {
1113 if ( yourls_is_serialized( $original ) ) // don't attempt to unserialize data that wasn't serialized going in
1114 return @unserialize( $original );
1119 * Determine if the current page is private
1122 function yourls_is_private() {
1125 if ( defined('YOURLS_PRIVATE') && YOURLS_PRIVATE == true ) {
1127 // Allow overruling for particular pages:
1130 if( yourls_is_API() ) {
1131 if( !defined('YOURLS_PRIVATE_API') || YOURLS_PRIVATE_API != false )
1135 } elseif( yourls_is_infos() ) {
1136 if( !defined('YOURLS_PRIVATE_INFOS') || YOURLS_PRIVATE_INFOS !== false )
1146 return yourls_apply_filter( 'is_private', $private );
1150 * Show login form if required
1153 function yourls_maybe_require_auth() {
1154 if( yourls_is_private() )
1155 require_once( YOURLS_INC.'/auth.php' );
1159 * Allow several short URLs for the same long URL ?
1162 function yourls_allow_duplicate_longurls() {
1163 // special treatment if API to check for WordPress plugin requests
1164 if( yourls_is_API() ) {
1165 if ( isset($_REQUEST['source']) && $_REQUEST['source'] == 'plugin' )
1168 return ( defined( 'YOURLS_UNIQUE_URLS' ) && YOURLS_UNIQUE_URLS == false );
1172 * Return list of all shorturls associated to the same long URL. Returns NULL or array of keywords.
1175 function yourls_get_duplicate_keywords( $longurl ) {
1176 if( !yourls_allow_duplicate_longurls() )
1180 $longurl = yourls_escape( yourls_sanitize_url($longurl) );
1181 $table = YOURLS_DB_TABLE_URL;
1183 $return = $ydb->get_col( "SELECT `keyword` FROM `$table` WHERE `url` = '$longurl'" );
1184 return yourls_apply_filter( 'get_duplicate_keywords', $return, $longurl );
1188 * Check if an IP shortens URL too fast to prevent DB flood. Return true, or die.
1191 function yourls_check_IP_flood( $ip = '' ) {
1193 // Allow plugins to short-circuit the whole function
1194 $pre = yourls_apply_filter( 'shunt_check_IP_flood', false, $ip );
1195 if ( false !== $pre )
1198 yourls_do_action( 'pre_check_ip_flood', $ip ); // at this point $ip can be '', check it if your plugin hooks in here
1201 ( defined('YOURLS_FLOOD_DELAY_SECONDS') && YOURLS_FLOOD_DELAY_SECONDS === 0 ) ||
1202 !defined('YOURLS_FLOOD_DELAY_SECONDS')
1206 $ip = ( $ip ? yourls_sanitize_ip( $ip ) : yourls_get_IP() );
1208 // Don't throttle whitelist IPs
1209 if( defined( 'YOURLS_FLOOD_IP_WHITELIST' ) && YOURLS_FLOOD_IP_WHITELIST ) {
1210 $whitelist_ips = explode( ',', YOURLS_FLOOD_IP_WHITELIST );
1211 foreach( (array)$whitelist_ips as $whitelist_ip ) {
1212 $whitelist_ip = trim( $whitelist_ip );
1213 if ( $whitelist_ip == $ip )
1218 // Don't throttle logged in users
1219 if( yourls_is_private() ) {
1220 if( yourls_is_valid_user() === true )
1224 yourls_do_action( 'check_ip_flood', $ip );
1227 $table = YOURLS_DB_TABLE_URL;
1229 $lasttime = $ydb->get_var( "SELECT `timestamp` FROM $table WHERE `ip` = '$ip' ORDER BY `timestamp` DESC LIMIT 1" );
1232 $then = date( 'U', strtotime( $lasttime ) );
1233 if( ( $now - $then ) <= YOURLS_FLOOD_DELAY_SECONDS ) {
1235 yourls_do_action( 'ip_flood', $ip, $now - $then );
1236 yourls_die( yourls__( 'Too many URLs added too fast. Slow down please.' ), yourls__( 'Forbidden' ), 403 );
1244 * Check if YOURLS is installing
1249 function yourls_is_installing() {
1250 $installing = defined( 'YOURLS_INSTALLING' ) && YOURLS_INSTALLING == true;
1251 return yourls_apply_filter( 'is_installing', $installing );
1255 * Check if YOURLS is upgrading
1260 function yourls_is_upgrading() {
1261 $upgrading = defined( 'YOURLS_UPGRADING' ) && YOURLS_UPGRADING == true;
1262 return yourls_apply_filter( 'is_upgrading', $upgrading );
1267 * Check if YOURLS is installed
1270 function yourls_is_installed() {
1271 static $is_installed = false;
1272 if ( $is_installed === false ) {
1273 $check_14 = $check_13 = false;
1275 if( defined('YOURLS_DB_TABLE_NEXTDEC') )
1276 $check_13 = $ydb->get_var('SELECT `next_id` FROM '.YOURLS_DB_TABLE_NEXTDEC);
1277 $check_14 = yourls_get_option( 'version' );
1278 $is_installed = $check_13 || $check_14;
1280 return yourls_apply_filter( 'is_installed', $is_installed );
1284 * Generate random string of (int)$length length and type $type (see function for details)
1287 function yourls_rnd_string ( $length = 5, $type = 0, $charlist = '' ) {
1289 $length = intval( $length );
1291 // define possible characters
1294 // custom char list, or comply to charset as defined in config
1296 $possible = $charlist ? $charlist : yourls_get_shorturl_charset() ;
1299 // no vowels to make no offending word, no 0/1/o/l to avoid confusion between letters & digits. Perfect for passwords.
1301 $possible = "23456789bcdfghjkmnpqrstvwxyz";
1304 // Same, with lower + upper
1306 $possible = "23456789bcdfghjkmnpqrstvwxyzBCDFGHJKMNPQRSTVWXYZ";
1309 // all letters, lowercase
1311 $possible = "abcdefghijklmnopqrstuvwxyz";
1314 // all letters, lowercase + uppercase
1316 $possible = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1319 // all digits & letters lowercase
1321 $possible = "0123456789abcdefghijklmnopqrstuvwxyz";
1324 // all digits & letters lowercase + uppercase
1326 $possible = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1332 while ($i < $length) {
1333 $str .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
1337 return yourls_apply_filter( 'rnd_string', $str, $length, $type, $charlist );
1341 * Return salted string
1344 function yourls_salt( $string ) {
1345 $salt = defined('YOURLS_COOKIEKEY') ? YOURLS_COOKIEKEY : md5(__FILE__) ;
1346 return yourls_apply_filter( 'yourls_salt', md5 ($string . $salt), $string );
1350 * Add a query var to a URL and return URL. Completely stolen from WP.
1352 * Works with one of these parameter patterns:
1353 * array( 'var' => 'value' )
1354 * array( 'var' => 'value' ), $url
1356 * 'var', 'value', $url
1357 * If $url ommited, uses $_SERVER['REQUEST_URI']
1360 function yourls_add_query_arg() {
1362 if ( is_array( func_get_arg(0) ) ) {
1363 if ( @func_num_args() < 2 || false === @func_get_arg( 1 ) )
1364 $uri = $_SERVER['REQUEST_URI'];
1366 $uri = @func_get_arg( 1 );
1368 if ( @func_num_args() < 3 || false === @func_get_arg( 2 ) )
1369 $uri = $_SERVER['REQUEST_URI'];
1371 $uri = @func_get_arg( 2 );
1374 $uri = str_replace( '&', '&', $uri );
1377 if ( $frag = strstr( $uri, '#' ) )
1378 $uri = substr( $uri, 0, -strlen( $frag ) );
1382 if ( preg_match( '|^https?://|i', $uri, $matches ) ) {
1383 $protocol = $matches[0];
1384 $uri = substr( $uri, strlen( $protocol ) );
1389 if ( strpos( $uri, '?' ) !== false ) {
1390 $parts = explode( '?', $uri, 2 );
1391 if ( 1 == count( $parts ) ) {
1395 $base = $parts[0] . '?';
1398 } elseif ( !empty( $protocol ) || strpos( $uri, '=' ) === false ) {
1406 parse_str( $query, $qs );
1407 $qs = yourls_urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
1408 if ( is_array( func_get_arg( 0 ) ) ) {
1409 $kayvees = func_get_arg( 0 );
1410 $qs = array_merge( $qs, $kayvees );
1412 $qs[func_get_arg( 0 )] = func_get_arg( 1 );
1415 foreach ( (array) $qs as $k => $v ) {
1420 $ret = http_build_query( $qs );
1421 $ret = trim( $ret, '?' );
1422 $ret = preg_replace( '#=(&|$)#', '$1', $ret );
1423 $ret = $protocol . $base . $ret . $frag;
1424 $ret = rtrim( $ret, '?' );
1429 * Navigates through an array and encodes the values to be used in a URL. Stolen from WP, used in yourls_add_query_arg()
1432 function yourls_urlencode_deep( $value ) {
1433 $value = is_array( $value ) ? array_map( 'yourls_urlencode_deep', $value ) : urlencode( $value );
1438 * Remove arg from query. Opposite of yourls_add_query_arg. Stolen from WP.
1441 function yourls_remove_query_arg( $key, $query = false ) {
1442 if ( is_array( $key ) ) { // removing multiple keys
1443 foreach ( $key as $k )
1444 $query = yourls_add_query_arg( $k, false, $query );
1447 return yourls_add_query_arg( $key, false, $query );
1451 * Return a time-dependent string for nonce creation
1454 function yourls_tick() {
1455 return ceil( time() / YOURLS_NONCE_LIFE );
1459 * Create a time limited, action limited and user limited token
1462 function yourls_create_nonce( $action, $user = false ) {
1463 if( false == $user )
1464 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1465 $tick = yourls_tick();
1466 return substr( yourls_salt($tick . $action . $user), 0, 10 );
1470 * Create a nonce field for inclusion into a form
1473 function yourls_nonce_field( $action, $name = 'nonce', $user = false, $echo = true ) {
1474 $field = '<input type="hidden" id="'.$name.'" name="'.$name.'" value="'.yourls_create_nonce( $action, $user ).'" />';
1481 * Add a nonce to a URL. If URL omitted, adds nonce to current URL
1484 function yourls_nonce_url( $action, $url = false, $name = 'nonce', $user = false ) {
1485 $nonce = yourls_create_nonce( $action, $user );
1486 return yourls_add_query_arg( $name, $nonce, $url );
1490 * Check validity of a nonce (ie time span, user and action match).
1492 * Returns true if valid, dies otherwise (yourls_die() or die($return) if defined)
1493 * if $nonce is false or unspecified, it will use $_REQUEST['nonce']
1496 function yourls_verify_nonce( $action, $nonce = false, $user = false, $return = '' ) {
1498 if( false == $user )
1499 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1501 // get current nonce value
1502 if( false == $nonce && isset( $_REQUEST['nonce'] ) )
1503 $nonce = $_REQUEST['nonce'];
1505 // what nonce should be
1506 $valid = yourls_create_nonce( $action, $user );
1508 if( $nonce == $valid ) {
1513 yourls_die( yourls__( 'Unauthorized action or expired link' ), yourls__( 'Error' ), 403 );
1518 * Converts keyword into short link (prepend with YOURLS base URL)
1521 function yourls_link( $keyword = '' ) {
1522 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword );
1523 return yourls_apply_filter( 'yourls_link', $link, $keyword );
1527 * Converts keyword into stat link (prepend with YOURLS base URL, append +)
1530 function yourls_statlink( $keyword = '' ) {
1531 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword ) . '+';
1532 if( yourls_is_ssl() )
1533 $link = str_replace( 'http://', 'https://', $link );
1534 return yourls_apply_filter( 'yourls_statlink', $link, $keyword );
1538 * Check if we're in API mode. Returns bool
1541 function yourls_is_API() {
1542 if ( defined( 'YOURLS_API' ) && YOURLS_API == true )
1548 * Check if we're in Ajax mode. Returns bool
1551 function yourls_is_Ajax() {
1552 if ( defined( 'YOURLS_AJAX' ) && YOURLS_AJAX == true )
1558 * Check if we're in GO mode (yourls-go.php). Returns bool
1561 function yourls_is_GO() {
1562 if ( defined( 'YOURLS_GO' ) && YOURLS_GO == true )
1568 * Check if we're displaying stats infos (yourls-infos.php). Returns bool
1571 function yourls_is_infos() {
1572 if ( defined( 'YOURLS_INFOS' ) && YOURLS_INFOS == true )
1578 * Check if we'll need interface display function (ie not API or redirection)
1581 function yourls_has_interface() {
1582 if( yourls_is_API() or yourls_is_GO() )
1588 * Check if we're in the admin area. Returns bool
1591 function yourls_is_admin() {
1592 if ( defined( 'YOURLS_ADMIN' ) && YOURLS_ADMIN == true )
1598 * Check if the server seems to be running on Windows. Not exactly sure how reliable this is.
1601 function yourls_is_windows() {
1602 return defined( 'DIRECTORY_SEPARATOR' ) && DIRECTORY_SEPARATOR == '\\';
1606 * Check if SSL is required. Returns bool.
1609 function yourls_needs_ssl() {
1610 if ( defined('YOURLS_ADMIN_SSL') && YOURLS_ADMIN_SSL == true )
1616 * Return admin link, with SSL preference if applicable.
1619 function yourls_admin_url( $page = '' ) {
1620 $admin = YOURLS_SITE . '/admin/' . $page;
1621 if( yourls_is_ssl() or yourls_needs_ssl() )
1622 $admin = str_replace('http://', 'https://', $admin);
1623 return yourls_apply_filter( 'admin_url', $admin, $page );
1627 * Return YOURLS_SITE or URL under YOURLS setup, with SSL preference
1630 function yourls_site_url( $echo = true, $url = '' ) {
1631 $url = yourls_get_relative_url( $url );
1632 $url = trim( YOURLS_SITE . '/' . $url, '/' );
1634 // Do not enforce (checking yourls_need_ssl() ) but check current usage so it won't force SSL on non-admin pages
1635 if( yourls_is_ssl() )
1636 $url = str_replace( 'http://', 'https://', $url );
1637 $url = yourls_apply_filter( 'site_url', $url );
1644 * Check if SSL is used, returns bool. Stolen from WP.
1647 function yourls_is_ssl() {
1649 if ( isset( $_SERVER['HTTPS'] ) ) {
1650 if ( 'on' == strtolower( $_SERVER['HTTPS'] ) )
1652 if ( '1' == $_SERVER['HTTPS'] )
1654 } elseif ( isset( $_SERVER['SERVER_PORT'] ) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
1657 return yourls_apply_filter( 'is_ssl', $is_ssl );
1662 * Get a remote page <title>, return a string (either title or url)
1665 function yourls_get_remote_title( $url ) {
1666 // Allow plugins to short-circuit the whole function
1667 $pre = yourls_apply_filter( 'shunt_get_remote_title', false, $url );
1668 if ( false !== $pre )
1671 require_once( YOURLS_INC.'/functions-http.php' );
1673 $url = yourls_sanitize_url( $url );
1675 $title = $charset = false;
1677 $content = yourls_get_remote_content( $url );
1679 // If false, return url as title.
1680 // Todo: improve this with temporary title when shorturl_meta available?
1681 if( false === $content )
1684 if( $content !== false ) {
1686 if ( preg_match('/<title>(.*?)<\/title>/is', $content, $found ) ) {
1692 // <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
1693 if ( preg_match('/<meta[^>]*?charset=([^>]*?)\/?>/is', $content, $found ) ) {
1694 $charset = trim($found[1], '"\' ');
1699 // if title not found, guess if returned content was actually an error message
1700 if( $title == false && strpos( $content, 'Error' ) === 0 ) {
1704 if( $title == false )
1708 if( !yourls_seems_utf8( $title ) )
1709 $title = utf8_encode( $title );
1712 // Charset conversion. We use @ to remove warnings (mb_ functions are easily bitching about illegal chars)
1713 if( function_exists( 'mb_convert_encoding' ) ) {
1715 $title = @mb_convert_encoding( $title, 'UTF-8', $charset );
1717 $title = @mb_convert_encoding( $title, 'UTF-8' );
1721 // Remove HTML entities
1722 $title = html_entity_decode( $title, ENT_QUOTES, 'UTF-8' );
1724 // Strip out evil things
1725 $title = yourls_sanitize_title( $title );
1727 return yourls_apply_filter( 'get_remote_title', $title, $url );
1731 * Quick UA check for mobile devices. Return boolean.
1734 function yourls_is_mobile_device() {
1737 'android', 'blackberry', 'blazer',
1738 'compal', 'elaine', 'fennec', 'hiptop',
1739 'iemobile', 'iphone', 'ipod', 'ipad',
1740 'iris', 'kindle', 'opera mobi', 'opera mini',
1741 'palm', 'phone', 'pocket', 'psp', 'symbian',
1742 'treo', 'wap', 'windows ce', 'windows phone'
1745 // Current user-agent
1746 $current = strtolower( $_SERVER['HTTP_USER_AGENT'] );
1749 $is_mobile = ( str_replace( $mobiles, '', $current ) != $current );
1750 return yourls_apply_filter( 'is_mobile_device', $is_mobile );
1754 * Get request in YOURLS base (eg in 'http://site.com/yourls/abcd' get 'abdc')
1757 function yourls_get_request() {
1758 // Allow plugins to short-circuit the whole function
1759 $pre = yourls_apply_filter( 'shunt_get_request', false );
1760 if ( false !== $pre )
1763 static $request = null;
1765 yourls_do_action( 'pre_get_request', $request );
1767 if( $request !== null )
1770 // Ignore protocol & www. prefix
1771 $root = str_replace( array( 'https://', 'http://', 'https://www.', 'http://www.' ), '', YOURLS_SITE );
1772 // Case insensitive comparison of the YOURLS root to match both http://Sho.rt/blah and http://sho.rt/blah
1773 $request = preg_replace( "!$root/!i", '', $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 1 );
1775 // Unless request looks like a full URL (ie request is a simple keyword) strip query string
1776 if( !preg_match( "@^[a-zA-Z]+://.+@", $request ) ) {
1777 $request = current( explode( '?', $request ) );
1780 return yourls_apply_filter( 'get_request', $request );
1784 * Change protocol to match current scheme used (http or https)
1787 function yourls_match_current_protocol( $url, $normal = 'http', $ssl = 'https' ) {
1788 if( yourls_is_ssl() )
1789 $url = str_replace( $normal, $ssl, $url );
1790 return yourls_apply_filter( 'match_current_protocol', $url );
1794 * Fix $_SERVER['REQUEST_URI'] variable for various setups. Stolen from WP.
1797 function yourls_fix_request_uri() {
1799 $default_server_values = array(
1800 'SERVER_SOFTWARE' => '',
1801 'REQUEST_URI' => '',
1803 $_SERVER = array_merge( $default_server_values, $_SERVER );
1805 // Fix for IIS when running with PHP ISAPI
1806 if ( empty( $_SERVER['REQUEST_URI'] ) || ( php_sapi_name() != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
1809 if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
1810 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
1812 // IIS Isapi_Rewrite
1813 else if ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
1814 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
1816 // Use ORIG_PATH_INFO if there is no PATH_INFO
1817 if ( !isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) )
1818 $_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
1820 // Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
1821 if ( isset( $_SERVER['PATH_INFO'] ) ) {
1822 if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
1823 $_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
1825 $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
1828 // Append the query string if it exists and isn't null
1829 if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
1830 $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
1837 * Shutdown function, runs just before PHP shuts down execution. Stolen from WP
1840 function yourls_shutdown() {
1841 yourls_do_action( 'shutdown' );
1845 * Auto detect custom favicon in /user directory, fallback to YOURLS favicon, and echo/return its URL
1848 function yourls_favicon( $echo = true ) {
1849 static $favicon = null;
1850 if( $favicon !== null )
1854 // search for favicon.(gif|ico|png|jpg|svg)
1855 foreach( array( 'gif', 'ico', 'png', 'jpg', 'svg' ) as $ext ) {
1856 if( file_exists( YOURLS_USERDIR. '/favicon.' . $ext ) ) {
1857 $custom = 'favicon.' . $ext;
1863 $favicon = yourls_site_url( false, YOURLS_USERURL . '/' . $custom );
1865 $favicon = yourls_site_url( false ) . '/images/favicon.gif';
1873 * Check for maintenance mode. If yes, die. See yourls_maintenance_mode(). Stolen from WP.
1876 function yourls_check_maintenance_mode() {
1878 $file = YOURLS_ABSPATH . '/.maintenance' ;
1879 if ( !file_exists( $file ) || yourls_is_upgrading() || yourls_is_installing() )
1882 global $maintenance_start;
1885 // If the $maintenance_start timestamp is older than 10 minutes, don't die.
1886 if ( ( time() - $maintenance_start ) >= 600 )
1889 // Use any /user/maintenance.php file
1890 if( file_exists( YOURLS_USERDIR.'/maintenance.php' ) ) {
1891 include( YOURLS_USERDIR.'/maintenance.php' );
1895 // https://www.youtube.com/watch?v=Xw-m4jEY-Ns
1896 $title = yourls__( 'Service temporarily unavailable' );
1897 $message = yourls__( 'Our service is currently undergoing scheduled maintenance.' ) . "</p>\n<p>" .
1898 yourls__( 'Things should not last very long, thank you for your patience and please excuse the inconvenience' );
1899 yourls_die( $message, $title , 503 );
1904 * Return current admin page, or null if not an admin page
1906 * @return mixed string if admin page, null if not an admin page
1909 function yourls_current_admin_page() {
1910 if( yourls_is_admin() ) {
1911 $current = substr( yourls_get_request(), 6 );
1912 if( $current === false )
1913 $current = 'index.php'; // if current page is http://sho.rt/admin/ instead of http://sho.rt/admin/index.php
1921 * Check if a URL protocol is allowed
1923 * Checks a URL against a list of whitelisted protocols. Protocols must be defined with
1924 * their complete scheme name, ie 'stuff:' or 'stuff://' (for instance, 'mailto:' is a valid
1925 * protocol, 'mailto://' isn't, and 'http:' with no double slashed isn't either
1929 * @param string $url URL to be check
1930 * @param array $protocols Optional. Array of protocols, defaults to global $yourls_allowedprotocols
1931 * @return boolean true if protocol allowed, false otherwise
1933 function yourls_is_allowed_protocol( $url, $protocols = array() ) {
1934 if( ! $protocols ) {
1935 global $yourls_allowedprotocols;
1936 $protocols = $yourls_allowedprotocols;
1939 $protocol = yourls_get_protocol( $url );
1940 return yourls_apply_filter( 'is_allowed_protocol', in_array( $protocol, $protocols ), $url, $protocols );
1944 * Get protocol from a URL (eg mailto:, http:// ...)
1948 * @param string $url URL to be check
1949 * @return string Protocol, with slash slash if applicable. Empty string if no protocol
1951 function yourls_get_protocol( $url ) {
1952 preg_match( '!^[a-zA-Z0-9\+\.-]+:(//)?!', $url, $matches );
1954 http://en.wikipedia.org/wiki/URI_scheme#Generic_syntax
1955 The scheme name consists of a sequence of characters beginning with a letter and followed by any
1956 combination of letters, digits, plus ("+"), period ("."), or hyphen ("-"). Although schemes are
1957 case-insensitive, the canonical form is lowercase and documents that specify schemes must do so
1958 with lowercase letters. It is followed by a colon (":").
1960 $protocol = ( isset( $matches[0] ) ? $matches[0] : '' );
1961 return yourls_apply_filter( 'get_protocol', $protocol, $url );
1965 * Get relative URL (eg 'abc' from 'http://sho.rt/abc')
1967 * Treat indifferently http & https. If a URL isn't relative to the YOURLS install, return it as is
1968 * or return empty string if $strict is true
1971 * @param string $url URL to relativize
1972 * @param bool $strict if true and if URL isn't relative to YOURLS install, return empty string
1973 * @return string URL
1975 function yourls_get_relative_url( $url, $strict = true ) {
1976 $url = yourls_sanitize_url( $url );
1978 // Remove protocols to make it easier
1979 $noproto_url = str_replace( 'https:', 'http:', $url );
1980 $noproto_site = str_replace( 'https:', 'http:', YOURLS_SITE );
1982 // Trim URL from YOURLS root URL : if no modification made, URL wasn't relative
1983 $_url = str_replace( $noproto_site . '/', '', $noproto_url );
1984 if( $_url == $noproto_url )
1985 $_url = ( $strict ? '' : $url );
1987 return yourls_apply_filter( 'get_relative_url', $_url, $url );
1991 * Marks a function as deprecated and informs when it has been used. Stolen from WP.
1993 * There is a hook deprecated_function that will be called that can be used
1994 * to get the backtrace up to what file and function called the deprecated
1997 * The current behavior is to trigger a user error if YOURLS_DEBUG is true.
1999 * This function is to be used in every function that is deprecated.
2002 * @uses yourls_do_action() Calls 'deprecated_function' and passes the function name, what to use instead,
2003 * and the version the function was deprecated in.
2004 * @uses yourls_apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do
2005 * trigger or false to not trigger error.
2007 * @param string $function The function that was called
2008 * @param string $version The version of WordPress that deprecated the function
2009 * @param string $replacement Optional. The function that should have been called
2011 function yourls_deprecated_function( $function, $version, $replacement = null ) {
2013 yourls_do_action( 'deprecated_function', $function, $replacement, $version );
2015 // Allow plugin to filter the output error trigger
2016 if ( YOURLS_DEBUG && yourls_apply_filters( 'deprecated_function_trigger_error', true ) ) {
2017 if ( ! is_null( $replacement ) )
2018 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) );
2020 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
2025 * Return the value if not an empty string
2027 * Used with array_filter(), to remove empty keys but not keys with value 0 or false
2030 * @param mixed $val Value to test against ''
2031 * @return bool True if not an empty string
2033 function yourls_return_if_not_empty_string( $val ) {
2034 return( $val !== '' );