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 ) yourls_die ( yourls__( 'DB config missing, or could not find DB class' ), yourls__( 'Fatal error' ), 503 );
410 // Are we standalone or in the WordPress environment?
411 if ( class_exists( 'wpdb' ) ) {
412 /* TODO: should we deprecate this? Follow WP dev in that area */
413 $ydb = new wpdb( YOURLS_DB_USER, YOURLS_DB_PASS, YOURLS_DB_NAME, YOURLS_DB_HOST );
415 yourls_set_DB_driver();
418 if ( $ydb->last_error )
419 yourls_die( $ydb->last_error, yourls__( 'Fatal error' ), 503 );
421 if ( defined( 'YOURLS_DEBUG' ) && YOURLS_DEBUG === true )
422 $ydb->show_errors = true;
431 function yourls_xml_encode( $array ) {
432 require_once( YOURLS_INC.'/functions-xml.php' );
433 $converter= new yourls_array2xml;
434 return $converter->array2xml( $array );
438 * 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
441 function yourls_get_keyword_infos( $keyword, $use_cache = true ) {
443 $keyword = yourls_sanitize_string( $keyword );
445 yourls_do_action( 'pre_get_keyword', $keyword, $use_cache );
447 if( isset( $ydb->infos[$keyword] ) && $use_cache == true ) {
448 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
451 yourls_do_action( 'get_keyword_not_cached', $keyword );
453 $table = YOURLS_DB_TABLE_URL;
454 $infos = $ydb->get_row( "SELECT * FROM `$table` WHERE `keyword` = '$keyword'" );
457 $infos = (array)$infos;
458 $ydb->infos[ $keyword ] = $infos;
460 $ydb->infos[ $keyword ] = false;
463 return yourls_apply_filter( 'get_keyword_infos', $ydb->infos[$keyword], $keyword );
467 * Return (string) selected information associated with a keyword. Optional $notfound = string default message if nothing found
470 function yourls_get_keyword_info( $keyword, $field, $notfound = false ) {
472 // Allow plugins to short-circuit the whole function
473 $pre = yourls_apply_filter( 'shunt_get_keyword_info', false, $keyword, $field, $notfound );
474 if ( false !== $pre )
477 $keyword = yourls_sanitize_string( $keyword );
478 $infos = yourls_get_keyword_infos( $keyword );
481 if ( isset( $infos[ $field ] ) && $infos[ $field ] !== false )
482 $return = $infos[ $field ];
484 return yourls_apply_filter( 'get_keyword_info', $return, $keyword, $field, $notfound );
488 * Return title associated with keyword. Optional $notfound = string default message if nothing found
491 function yourls_get_keyword_title( $keyword, $notfound = false ) {
492 return yourls_get_keyword_info( $keyword, 'title', $notfound );
496 * Return long URL associated with keyword. Optional $notfound = string default message if nothing found
499 function yourls_get_keyword_longurl( $keyword, $notfound = false ) {
500 return yourls_get_keyword_info( $keyword, 'url', $notfound );
504 * Return number of clicks on a keyword. Optional $notfound = string default message if nothing found
507 function yourls_get_keyword_clicks( $keyword, $notfound = false ) {
508 return yourls_get_keyword_info( $keyword, 'clicks', $notfound );
512 * Return IP that added a keyword. Optional $notfound = string default message if nothing found
515 function yourls_get_keyword_IP( $keyword, $notfound = false ) {
516 return yourls_get_keyword_info( $keyword, 'ip', $notfound );
520 * Return timestamp associated with a keyword. Optional $notfound = string default message if nothing found
523 function yourls_get_keyword_timestamp( $keyword, $notfound = false ) {
524 return yourls_get_keyword_info( $keyword, 'timestamp', $notfound );
528 * Update click count on a short URL. Return 0/1 for error/success.
531 function yourls_update_clicks( $keyword, $clicks = false ) {
532 // Allow plugins to short-circuit the whole function
533 $pre = yourls_apply_filter( 'shunt_update_clicks', false, $keyword, $clicks );
534 if ( false !== $pre )
538 $keyword = yourls_sanitize_string( $keyword );
539 $table = YOURLS_DB_TABLE_URL;
540 if ( $clicks !== false && is_int( $clicks ) && $clicks >= 0 )
541 $update = $ydb->query( "UPDATE `$table` SET `clicks` = $clicks WHERE `keyword` = '$keyword'" );
543 $update = $ydb->query( "UPDATE `$table` SET `clicks` = clicks + 1 WHERE `keyword` = '$keyword'" );
545 yourls_do_action( 'update_clicks', $keyword, $update, $clicks );
550 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
553 function yourls_get_stats( $filter = 'top', $limit = 10, $start = 0 ) {
562 $sort_by = 'timestamp';
563 $sort_order = 'desc';
573 $sort_order = 'desc';
578 $limit = intval( $limit );
579 $start = intval( $start );
582 $table_url = YOURLS_DB_TABLE_URL;
583 $results = $ydb->get_results( "SELECT * FROM `$table_url` WHERE 1=1 ORDER BY `$sort_by` $sort_order LIMIT $start, $limit;" );
588 foreach ( (array)$results as $res ) {
589 $return['links']['link_'.$i++] = array(
590 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
592 'title' => $res->title,
593 'timestamp'=> $res->timestamp,
595 'clicks' => $res->clicks,
600 $return['stats'] = yourls_get_db_stats();
602 $return['statusCode'] = 200;
604 return yourls_apply_filter( 'get_stats', $return, $filter, $limit, $start );
608 * Return array of stats. (string)$filter is 'bottom', 'last', 'rand' or 'top'. (int)$limit is the number of links to return
611 function yourls_get_link_stats( $shorturl ) {
614 $table_url = YOURLS_DB_TABLE_URL;
615 $res = $ydb->get_row( "SELECT * FROM `$table_url` WHERE keyword = '$shorturl';" );
622 'message' => 'Error: short URL not found',
627 'message' => 'success',
629 'shorturl' => YOURLS_SITE .'/'. $res->keyword,
631 'title' => $res->title,
632 'timestamp'=> $res->timestamp,
634 'clicks' => $res->clicks,
639 return yourls_apply_filter( 'get_link_stats', $return, $shorturl );
643 * Get total number of URLs and sum of clicks. Input: optional "AND WHERE" clause. Returns array
646 function yourls_get_db_stats( $where = '' ) {
648 $table_url = YOURLS_DB_TABLE_URL;
650 $totals = $ydb->get_row( "SELECT COUNT(keyword) as count, SUM(clicks) as sum FROM `$table_url` WHERE 1=1 $where" );
651 $return = array( 'total_links' => $totals->count, 'total_clicks' => $totals->sum );
653 return yourls_apply_filter( 'get_db_stats', $return, $where );
657 * Get number of SQL queries performed
660 function yourls_get_num_queries() {
663 return yourls_apply_filter( 'get_num_queries', $ydb->num_queries );
667 * Returns a sanitized a user agent string. Given what I found on http://www.user-agents.org/ it should be OK.
670 function yourls_get_user_agent() {
671 if ( !isset( $_SERVER['HTTP_USER_AGENT'] ) )
674 $ua = strip_tags( html_entity_decode( $_SERVER['HTTP_USER_AGENT'] ));
675 $ua = preg_replace('![^0-9a-zA-Z\':., /{}\(\)\[\]\+@&\!\?;_\-=~\*\#]!', '', $ua );
677 return yourls_apply_filter( 'get_user_agent', substr( $ua, 0, 254 ) );
681 * Redirect to another page
684 function yourls_redirect( $location, $code = 301 ) {
685 yourls_do_action( 'pre_redirect', $location, $code );
686 $location = yourls_apply_filter( 'redirect_location', $location, $code );
687 $code = yourls_apply_filter( 'redirect_code', $code, $location );
688 // Redirect, either properly if possible, or via Javascript otherwise
689 if( !headers_sent() ) {
690 yourls_status_header( $code );
691 header( "Location: $location" );
693 yourls_redirect_javascript( $location );
699 * Set HTTP status header
702 function yourls_status_header( $code = 200 ) {
706 $protocol = $_SERVER["SERVER_PROTOCOL"];
707 if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
708 $protocol = 'HTTP/1.0';
710 $code = intval( $code );
711 $desc = yourls_get_HTTP_status( $code );
713 @header ("$protocol $code $desc"); // This causes problems on IIS and some FastCGI setups
714 yourls_do_action( 'status_header', $code );
718 * Redirect to another page using Javascript. Set optional (bool)$dontwait to false to force manual redirection (make sure a message has been read by user)
721 function yourls_redirect_javascript( $location, $dontwait = true ) {
722 yourls_do_action( 'pre_redirect_javascript', $location, $dontwait );
723 $location = yourls_apply_filter( 'redirect_javascript', $location, $dontwait );
725 $message = yourls_s( 'if you are not redirected after 10 seconds, please <a href="%s">click here</a>', $location );
727 <script type="text/javascript">
728 window.location="$location";
730 <small>($message)</small>
733 echo '<p>' . yourls_s( 'Please <a href="%s">click here</a>', $location ) . '</p>';
735 yourls_do_action( 'post_redirect_javascript', $location );
739 * Return a HTTP status code
742 function yourls_get_HTTP_status( $code ) {
743 $code = intval( $code );
744 $headers_desc = array(
746 101 => 'Switching Protocols',
752 203 => 'Non-Authoritative Information',
754 205 => 'Reset Content',
755 206 => 'Partial Content',
756 207 => 'Multi-Status',
759 300 => 'Multiple Choices',
760 301 => 'Moved Permanently',
763 304 => 'Not Modified',
766 307 => 'Temporary Redirect',
768 400 => 'Bad Request',
769 401 => 'Unauthorized',
770 402 => 'Payment Required',
773 405 => 'Method Not Allowed',
774 406 => 'Not Acceptable',
775 407 => 'Proxy Authentication Required',
776 408 => 'Request Timeout',
779 411 => 'Length Required',
780 412 => 'Precondition Failed',
781 413 => 'Request Entity Too Large',
782 414 => 'Request-URI Too Long',
783 415 => 'Unsupported Media Type',
784 416 => 'Requested Range Not Satisfiable',
785 417 => 'Expectation Failed',
786 422 => 'Unprocessable Entity',
788 424 => 'Failed Dependency',
789 426 => 'Upgrade Required',
791 500 => 'Internal Server Error',
792 501 => 'Not Implemented',
793 502 => 'Bad Gateway',
794 503 => 'Service Unavailable',
795 504 => 'Gateway Timeout',
796 505 => 'HTTP Version Not Supported',
797 506 => 'Variant Also Negotiates',
798 507 => 'Insufficient Storage',
799 510 => 'Not Extended'
802 if ( isset( $headers_desc[$code] ) )
803 return $headers_desc[$code];
810 * Log a redirect (for stats)
813 function yourls_log_redirect( $keyword ) {
814 // Allow plugins to short-circuit the whole function
815 $pre = yourls_apply_filter( 'shunt_log_redirect', false, $keyword );
816 if ( false !== $pre )
819 if ( !yourls_do_log_redirect() )
823 $table = YOURLS_DB_TABLE_LOG;
825 $keyword = yourls_sanitize_string( $keyword );
826 $referrer = ( isset( $_SERVER['HTTP_REFERER'] ) ? yourls_sanitize_url( $_SERVER['HTTP_REFERER'] ) : 'direct' );
827 $ua = yourls_get_user_agent();
828 $ip = yourls_get_IP();
829 $location = yourls_geo_ip_to_countrycode( $ip );
831 return $ydb->query( "INSERT INTO `$table` (click_time, shorturl, referrer, user_agent, ip_address, country_code) VALUES (NOW(), '$keyword', '$referrer', '$ua', '$ip', '$location')" );
835 * Check if we want to not log redirects (for stats)
838 function yourls_do_log_redirect() {
839 return ( !defined( 'YOURLS_NOSTATS' ) || YOURLS_NOSTATS != true );
843 * Converts an IP to a 2 letter country code, using GeoIP database if available in includes/geo/
846 function yourls_geo_ip_to_countrycode( $ip = '', $default = '' ) {
847 // Allow plugins to short-circuit the Geo IP API
848 $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
849 if ( false !== $location )
852 if ( !file_exists( YOURLS_INC.'/geo/GeoIP.dat') || !file_exists( YOURLS_INC.'/geo/geoip.inc') )
856 $ip = yourls_get_IP();
858 require_once( YOURLS_INC.'/geo/geoip.inc') ;
859 $gi = geoip_open( YOURLS_INC.'/geo/GeoIP.dat', GEOIP_STANDARD);
860 $location = geoip_country_code_by_addr($gi, $ip);
863 return yourls_apply_filter( 'geo_ip_to_countrycode', $location, $ip, $default );
867 * Converts a 2 letter country code to long name (ie AU -> Australia)
870 function yourls_geo_countrycode_to_countryname( $code ) {
871 // Allow plugins to short-circuit the Geo IP API
872 $country = yourls_apply_filter( 'shunt_geo_countrycode_to_countryname', false, $code );
873 if ( false !== $country )
876 // Load the Geo class if not already done
877 if( !class_exists( 'GeoIP' ) ) {
878 $temp = yourls_geo_ip_to_countrycode( '127.0.0.1' );
881 if( class_exists( 'GeoIP' ) ) {
883 $id = $geo->GEOIP_COUNTRY_CODE_TO_NUMBER[ $code ];
884 $long = $geo->GEOIP_COUNTRY_NAMES[ $id ];
892 * Return flag URL from 2 letter country code
895 function yourls_geo_get_flag( $code ) {
896 if( file_exists( YOURLS_INC.'/geo/flags/flag_'.strtolower($code).'.gif' ) ) {
897 $img = yourls_match_current_protocol( YOURLS_SITE.'/includes/geo/flags/flag_'.( strtolower( $code ) ).'.gif' );
901 return yourls_apply_filter( 'geo_get_flag', $img, $code );
906 * Check if an upgrade is needed
909 function yourls_upgrade_is_needed() {
910 // check YOURLS_DB_VERSION exist && match values stored in YOURLS_DB_TABLE_OPTIONS
911 list( $currentver, $currentsql ) = yourls_get_current_version_from_sql();
912 if( $currentsql < YOURLS_DB_VERSION )
919 * Get current version & db version as stored in the options DB. Prior to 1.4 there's no option table.
922 function yourls_get_current_version_from_sql() {
923 $currentver = yourls_get_option( 'version' );
924 $currentsql = yourls_get_option( 'db_version' );
926 // Values if version is 1.3
932 return array( $currentver, $currentsql);
936 * Read an option from DB (or from cache if available). Return value or $default if not found
939 function yourls_get_option( $option_name, $default = false ) {
942 // Allow plugins to short-circuit options
943 $pre = yourls_apply_filter( 'shunt_option_'.$option_name, false );
944 if ( false !== $pre )
947 // If option not cached already, get its value from the DB
948 if ( !isset( $ydb->option[$option_name] ) ) {
949 $table = YOURLS_DB_TABLE_OPTIONS;
950 $option_name = yourls_escape( $option_name );
951 $row = $ydb->get_row( "SELECT `option_value` FROM `$table` WHERE `option_name` = '$option_name' LIMIT 1" );
952 if ( is_object( $row) ) { // Has to be get_row instead of get_var because of funkiness with 0, false, null values
953 $value = $row->option_value;
954 } else { // option does not exist, so we must cache its non-existence
957 $ydb->option[ $option_name ] = yourls_maybe_unserialize( $value );
960 return yourls_apply_filter( 'get_option_'.$option_name, $ydb->option[$option_name] );
964 * Read all options from DB at once
967 function yourls_get_all_options() {
970 // Allow plugins to short-circuit all options. (Note: regular plugins are loaded after all options)
971 $pre = yourls_apply_filter( 'shunt_all_options', false );
972 if ( false !== $pre )
975 $table = YOURLS_DB_TABLE_OPTIONS;
977 $allopt = $ydb->get_results( "SELECT `option_name`, `option_value` FROM `$table` WHERE 1=1" );
979 foreach( (array)$allopt as $option ) {
980 $ydb->option[$option->option_name] = yourls_maybe_unserialize( $option->option_value );
983 $ydb->option = yourls_apply_filter( 'get_all_options', $ydb->option );
987 * Update (add if doesn't exist) an option to DB
990 function yourls_update_option( $option_name, $newvalue ) {
992 $table = YOURLS_DB_TABLE_OPTIONS;
994 $safe_option_name = yourls_escape( $option_name );
996 $oldvalue = yourls_get_option( $safe_option_name );
998 // If the new and old values are the same, no need to update.
999 if ( $newvalue === $oldvalue )
1002 if ( false === $oldvalue ) {
1003 yourls_add_option( $option_name, $newvalue );
1007 $_newvalue = yourls_escape( yourls_maybe_serialize( $newvalue ) );
1009 yourls_do_action( 'update_option', $option_name, $oldvalue, $newvalue );
1011 $ydb->query( "UPDATE `$table` SET `option_value` = '$_newvalue' WHERE `option_name` = '$option_name'" );
1013 if ( $ydb->rows_affected == 1 ) {
1014 $ydb->option[ $option_name ] = $newvalue;
1021 * Add an option to the DB
1024 function yourls_add_option( $name, $value = '' ) {
1026 $table = YOURLS_DB_TABLE_OPTIONS;
1027 $safe_name = yourls_escape( $name );
1029 // Make sure the option doesn't already exist
1030 if ( false !== yourls_get_option( $safe_name ) )
1033 $_value = yourls_escape( yourls_maybe_serialize( $value ) );
1035 yourls_do_action( 'add_option', $safe_name, $_value );
1037 $ydb->query( "INSERT INTO `$table` (`option_name`, `option_value`) VALUES ('$name', '$_value')" );
1038 $ydb->option[ $name ] = $value;
1044 * Delete an option from the DB
1047 function yourls_delete_option( $name ) {
1049 $table = YOURLS_DB_TABLE_OPTIONS;
1050 $name = yourls_escape( $name );
1052 // Get the ID, if no ID then return
1053 $option = $ydb->get_row( "SELECT option_id FROM `$table` WHERE `option_name` = '$name'" );
1054 if ( is_null( $option ) || !$option->option_id )
1057 yourls_do_action( 'delete_option', $option_name );
1059 $ydb->query( "DELETE FROM `$table` WHERE `option_name` = '$name'" );
1066 * Serialize data if needed. Stolen from WordPress
1069 function yourls_maybe_serialize( $data ) {
1070 if ( is_array( $data ) || is_object( $data ) )
1071 return serialize( $data );
1073 if ( yourls_is_serialized( $data ) )
1074 return serialize( $data );
1080 * Check value to find if it was serialized. Stolen from WordPress
1083 function yourls_is_serialized( $data ) {
1084 // if it isn't a string, it isn't serialized
1085 if ( !is_string( $data ) )
1087 $data = trim( $data );
1088 if ( 'N;' == $data )
1090 if ( !preg_match( '/^([adObis]):/', $data, $badions ) )
1092 switch ( $badions[1] ) {
1096 if ( preg_match( "/^{$badions[1]}:[0-9]+:.*[;}]\$/s", $data ) )
1102 if ( preg_match( "/^{$badions[1]}:[0-9.E-]+;\$/", $data ) )
1110 * Unserialize value only if it was serialized. Stolen from WP
1113 function yourls_maybe_unserialize( $original ) {
1114 if ( yourls_is_serialized( $original ) ) // don't attempt to unserialize data that wasn't serialized going in
1115 return @unserialize( $original );
1120 * Determine if the current page is private
1123 function yourls_is_private() {
1126 if ( defined('YOURLS_PRIVATE') && YOURLS_PRIVATE == true ) {
1128 // Allow overruling for particular pages:
1131 if( yourls_is_API() ) {
1132 if( !defined('YOURLS_PRIVATE_API') || YOURLS_PRIVATE_API != false )
1136 } elseif( yourls_is_infos() ) {
1137 if( !defined('YOURLS_PRIVATE_INFOS') || YOURLS_PRIVATE_INFOS !== false )
1147 return yourls_apply_filter( 'is_private', $private );
1151 * Show login form if required
1154 function yourls_maybe_require_auth() {
1155 if( yourls_is_private() ) {
1156 yourls_do_action( 'require_auth' );
1157 require_once( YOURLS_INC.'/auth.php' );
1159 yourls_do_action( 'require_no_auth' );
1164 * Allow several short URLs for the same long URL ?
1167 function yourls_allow_duplicate_longurls() {
1168 // special treatment if API to check for WordPress plugin requests
1169 if( yourls_is_API() ) {
1170 if ( isset($_REQUEST['source']) && $_REQUEST['source'] == 'plugin' )
1173 return ( defined( 'YOURLS_UNIQUE_URLS' ) && YOURLS_UNIQUE_URLS == false );
1177 * Return list of all shorturls associated to the same long URL. Returns NULL or array of keywords.
1180 function yourls_get_duplicate_keywords( $longurl ) {
1181 if( !yourls_allow_duplicate_longurls() )
1185 $longurl = yourls_escape( yourls_sanitize_url($longurl) );
1186 $table = YOURLS_DB_TABLE_URL;
1188 $return = $ydb->get_col( "SELECT `keyword` FROM `$table` WHERE `url` = '$longurl'" );
1189 return yourls_apply_filter( 'get_duplicate_keywords', $return, $longurl );
1193 * Check if an IP shortens URL too fast to prevent DB flood. Return true, or die.
1196 function yourls_check_IP_flood( $ip = '' ) {
1198 // Allow plugins to short-circuit the whole function
1199 $pre = yourls_apply_filter( 'shunt_check_IP_flood', false, $ip );
1200 if ( false !== $pre )
1203 yourls_do_action( 'pre_check_ip_flood', $ip ); // at this point $ip can be '', check it if your plugin hooks in here
1206 ( defined('YOURLS_FLOOD_DELAY_SECONDS') && YOURLS_FLOOD_DELAY_SECONDS === 0 ) ||
1207 !defined('YOURLS_FLOOD_DELAY_SECONDS')
1211 $ip = ( $ip ? yourls_sanitize_ip( $ip ) : yourls_get_IP() );
1213 // Don't throttle whitelist IPs
1214 if( defined( 'YOURLS_FLOOD_IP_WHITELIST' ) && YOURLS_FLOOD_IP_WHITELIST ) {
1215 $whitelist_ips = explode( ',', YOURLS_FLOOD_IP_WHITELIST );
1216 foreach( (array)$whitelist_ips as $whitelist_ip ) {
1217 $whitelist_ip = trim( $whitelist_ip );
1218 if ( $whitelist_ip == $ip )
1223 // Don't throttle logged in users
1224 if( yourls_is_private() ) {
1225 if( yourls_is_valid_user() === true )
1229 yourls_do_action( 'check_ip_flood', $ip );
1232 $table = YOURLS_DB_TABLE_URL;
1234 $lasttime = $ydb->get_var( "SELECT `timestamp` FROM $table WHERE `ip` = '$ip' ORDER BY `timestamp` DESC LIMIT 1" );
1237 $then = date( 'U', strtotime( $lasttime ) );
1238 if( ( $now - $then ) <= YOURLS_FLOOD_DELAY_SECONDS ) {
1240 yourls_do_action( 'ip_flood', $ip, $now - $then );
1241 yourls_die( yourls__( 'Too many URLs added too fast. Slow down please.' ), yourls__( 'Forbidden' ), 403 );
1249 * Check if YOURLS is installing
1254 function yourls_is_installing() {
1255 $installing = defined( 'YOURLS_INSTALLING' ) && YOURLS_INSTALLING == true;
1256 return yourls_apply_filter( 'is_installing', $installing );
1260 * Check if YOURLS is upgrading
1265 function yourls_is_upgrading() {
1266 $upgrading = defined( 'YOURLS_UPGRADING' ) && YOURLS_UPGRADING == true;
1267 return yourls_apply_filter( 'is_upgrading', $upgrading );
1272 * Check if YOURLS is installed
1275 function yourls_is_installed() {
1276 static $is_installed = false;
1277 if ( $is_installed === false ) {
1278 $check_14 = $check_13 = false;
1280 if( defined('YOURLS_DB_TABLE_NEXTDEC') )
1281 $check_13 = $ydb->get_var('SELECT `next_id` FROM '.YOURLS_DB_TABLE_NEXTDEC);
1282 $check_14 = yourls_get_option( 'version' );
1283 $is_installed = $check_13 || $check_14;
1285 return yourls_apply_filter( 'is_installed', $is_installed );
1289 * Generate random string of (int)$length length and type $type (see function for details)
1292 function yourls_rnd_string ( $length = 5, $type = 0, $charlist = '' ) {
1294 $length = intval( $length );
1296 // define possible characters
1299 // custom char list, or comply to charset as defined in config
1301 $possible = $charlist ? $charlist : yourls_get_shorturl_charset() ;
1304 // no vowels to make no offending word, no 0/1/o/l to avoid confusion between letters & digits. Perfect for passwords.
1306 $possible = "23456789bcdfghjkmnpqrstvwxyz";
1309 // Same, with lower + upper
1311 $possible = "23456789bcdfghjkmnpqrstvwxyzBCDFGHJKMNPQRSTVWXYZ";
1314 // all letters, lowercase
1316 $possible = "abcdefghijklmnopqrstuvwxyz";
1319 // all letters, lowercase + uppercase
1321 $possible = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1324 // all digits & letters lowercase
1326 $possible = "0123456789abcdefghijklmnopqrstuvwxyz";
1329 // all digits & letters lowercase + uppercase
1331 $possible = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
1337 while ($i < $length) {
1338 $str .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
1342 return yourls_apply_filter( 'rnd_string', $str, $length, $type, $charlist );
1346 * Return salted string
1349 function yourls_salt( $string ) {
1350 $salt = defined('YOURLS_COOKIEKEY') ? YOURLS_COOKIEKEY : md5(__FILE__) ;
1351 return yourls_apply_filter( 'yourls_salt', md5 ($string . $salt), $string );
1355 * Add a query var to a URL and return URL. Completely stolen from WP.
1357 * Works with one of these parameter patterns:
1358 * array( 'var' => 'value' )
1359 * array( 'var' => 'value' ), $url
1361 * 'var', 'value', $url
1362 * If $url ommited, uses $_SERVER['REQUEST_URI']
1365 function yourls_add_query_arg() {
1367 if ( is_array( func_get_arg(0) ) ) {
1368 if ( @func_num_args() < 2 || false === @func_get_arg( 1 ) )
1369 $uri = $_SERVER['REQUEST_URI'];
1371 $uri = @func_get_arg( 1 );
1373 if ( @func_num_args() < 3 || false === @func_get_arg( 2 ) )
1374 $uri = $_SERVER['REQUEST_URI'];
1376 $uri = @func_get_arg( 2 );
1379 $uri = str_replace( '&', '&', $uri );
1382 if ( $frag = strstr( $uri, '#' ) )
1383 $uri = substr( $uri, 0, -strlen( $frag ) );
1387 if ( preg_match( '|^https?://|i', $uri, $matches ) ) {
1388 $protocol = $matches[0];
1389 $uri = substr( $uri, strlen( $protocol ) );
1394 if ( strpos( $uri, '?' ) !== false ) {
1395 $parts = explode( '?', $uri, 2 );
1396 if ( 1 == count( $parts ) ) {
1400 $base = $parts[0] . '?';
1403 } elseif ( !empty( $protocol ) || strpos( $uri, '=' ) === false ) {
1411 parse_str( $query, $qs );
1412 $qs = yourls_urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
1413 if ( is_array( func_get_arg( 0 ) ) ) {
1414 $kayvees = func_get_arg( 0 );
1415 $qs = array_merge( $qs, $kayvees );
1417 $qs[func_get_arg( 0 )] = func_get_arg( 1 );
1420 foreach ( (array) $qs as $k => $v ) {
1425 $ret = http_build_query( $qs );
1426 $ret = trim( $ret, '?' );
1427 $ret = preg_replace( '#=(&|$)#', '$1', $ret );
1428 $ret = $protocol . $base . $ret . $frag;
1429 $ret = rtrim( $ret, '?' );
1434 * Navigates through an array and encodes the values to be used in a URL. Stolen from WP, used in yourls_add_query_arg()
1437 function yourls_urlencode_deep( $value ) {
1438 $value = is_array( $value ) ? array_map( 'yourls_urlencode_deep', $value ) : urlencode( $value );
1443 * Remove arg from query. Opposite of yourls_add_query_arg. Stolen from WP.
1446 function yourls_remove_query_arg( $key, $query = false ) {
1447 if ( is_array( $key ) ) { // removing multiple keys
1448 foreach ( $key as $k )
1449 $query = yourls_add_query_arg( $k, false, $query );
1452 return yourls_add_query_arg( $key, false, $query );
1456 * Return a time-dependent string for nonce creation
1459 function yourls_tick() {
1460 return ceil( time() / YOURLS_NONCE_LIFE );
1464 * Create a time limited, action limited and user limited token
1467 function yourls_create_nonce( $action, $user = false ) {
1468 if( false == $user )
1469 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1470 $tick = yourls_tick();
1471 return substr( yourls_salt($tick . $action . $user), 0, 10 );
1475 * Create a nonce field for inclusion into a form
1478 function yourls_nonce_field( $action, $name = 'nonce', $user = false, $echo = true ) {
1479 $field = '<input type="hidden" id="'.$name.'" name="'.$name.'" value="'.yourls_create_nonce( $action, $user ).'" />';
1486 * Add a nonce to a URL. If URL omitted, adds nonce to current URL
1489 function yourls_nonce_url( $action, $url = false, $name = 'nonce', $user = false ) {
1490 $nonce = yourls_create_nonce( $action, $user );
1491 return yourls_add_query_arg( $name, $nonce, $url );
1495 * Check validity of a nonce (ie time span, user and action match).
1497 * Returns true if valid, dies otherwise (yourls_die() or die($return) if defined)
1498 * if $nonce is false or unspecified, it will use $_REQUEST['nonce']
1501 function yourls_verify_nonce( $action, $nonce = false, $user = false, $return = '' ) {
1503 if( false == $user )
1504 $user = defined( 'YOURLS_USER' ) ? YOURLS_USER : '-1';
1506 // get current nonce value
1507 if( false == $nonce && isset( $_REQUEST['nonce'] ) )
1508 $nonce = $_REQUEST['nonce'];
1510 // what nonce should be
1511 $valid = yourls_create_nonce( $action, $user );
1513 if( $nonce == $valid ) {
1518 yourls_die( yourls__( 'Unauthorized action or expired link' ), yourls__( 'Error' ), 403 );
1523 * Converts keyword into short link (prepend with YOURLS base URL)
1526 function yourls_link( $keyword = '' ) {
1527 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword );
1528 return yourls_apply_filter( 'yourls_link', $link, $keyword );
1532 * Converts keyword into stat link (prepend with YOURLS base URL, append +)
1535 function yourls_statlink( $keyword = '' ) {
1536 $link = YOURLS_SITE . '/' . yourls_sanitize_keyword( $keyword ) . '+';
1537 if( yourls_is_ssl() )
1538 $link = str_replace( 'http://', 'https://', $link );
1539 return yourls_apply_filter( 'yourls_statlink', $link, $keyword );
1543 * Check if we're in API mode. Returns bool
1546 function yourls_is_API() {
1547 if ( defined( 'YOURLS_API' ) && YOURLS_API == true )
1553 * Check if we're in Ajax mode. Returns bool
1556 function yourls_is_Ajax() {
1557 if ( defined( 'YOURLS_AJAX' ) && YOURLS_AJAX == true )
1563 * Check if we're in GO mode (yourls-go.php). Returns bool
1566 function yourls_is_GO() {
1567 if ( defined( 'YOURLS_GO' ) && YOURLS_GO == true )
1573 * Check if we're displaying stats infos (yourls-infos.php). Returns bool
1576 function yourls_is_infos() {
1577 if ( defined( 'YOURLS_INFOS' ) && YOURLS_INFOS == true )
1583 * Check if we'll need interface display function (ie not API or redirection)
1586 function yourls_has_interface() {
1587 if( yourls_is_API() or yourls_is_GO() )
1593 * Check if we're in the admin area. Returns bool
1596 function yourls_is_admin() {
1597 if ( defined( 'YOURLS_ADMIN' ) && YOURLS_ADMIN == true )
1603 * Check if the server seems to be running on Windows. Not exactly sure how reliable this is.
1606 function yourls_is_windows() {
1607 return defined( 'DIRECTORY_SEPARATOR' ) && DIRECTORY_SEPARATOR == '\\';
1611 * Check if SSL is required. Returns bool.
1614 function yourls_needs_ssl() {
1615 if ( defined('YOURLS_ADMIN_SSL') && YOURLS_ADMIN_SSL == true )
1621 * Return admin link, with SSL preference if applicable.
1624 function yourls_admin_url( $page = '' ) {
1625 $admin = YOURLS_SITE . '/admin/' . $page;
1626 if( yourls_is_ssl() or yourls_needs_ssl() )
1627 $admin = str_replace('http://', 'https://', $admin);
1628 return yourls_apply_filter( 'admin_url', $admin, $page );
1632 * Return YOURLS_SITE or URL under YOURLS setup, with SSL preference
1635 function yourls_site_url( $echo = true, $url = '' ) {
1636 $url = yourls_get_relative_url( $url );
1637 $url = trim( YOURLS_SITE . '/' . $url, '/' );
1639 // Do not enforce (checking yourls_need_ssl() ) but check current usage so it won't force SSL on non-admin pages
1640 if( yourls_is_ssl() )
1641 $url = str_replace( 'http://', 'https://', $url );
1642 $url = yourls_apply_filter( 'site_url', $url );
1649 * Check if SSL is used, returns bool. Stolen from WP.
1652 function yourls_is_ssl() {
1654 if ( isset( $_SERVER['HTTPS'] ) ) {
1655 if ( 'on' == strtolower( $_SERVER['HTTPS'] ) )
1657 if ( '1' == $_SERVER['HTTPS'] )
1659 } elseif ( isset( $_SERVER['SERVER_PORT'] ) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
1662 return yourls_apply_filter( 'is_ssl', $is_ssl );
1667 * Get a remote page <title>, return a string (either title or url)
1670 function yourls_get_remote_title( $url ) {
1671 // Allow plugins to short-circuit the whole function
1672 $pre = yourls_apply_filter( 'shunt_get_remote_title', false, $url );
1673 if ( false !== $pre )
1676 require_once( YOURLS_INC.'/functions-http.php' );
1678 $url = yourls_sanitize_url( $url );
1680 $title = $charset = false;
1682 $content = yourls_get_remote_content( $url );
1684 // If false, return url as title.
1685 // Todo: improve this with temporary title when shorturl_meta available?
1686 if( false === $content )
1689 if( $content !== false ) {
1691 if ( preg_match('/<title>(.*?)<\/title>/is', $content, $found ) ) {
1697 // <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
1698 if ( preg_match('/<meta[^>]*?charset=([^>]*?)\/?>/is', $content, $found ) ) {
1699 $charset = trim($found[1], '"\' ');
1704 // if title not found, guess if returned content was actually an error message
1705 if( $title == false && strpos( $content, 'Error' ) === 0 ) {
1709 if( $title == false )
1713 if( !yourls_seems_utf8( $title ) )
1714 $title = utf8_encode( $title );
1717 // Charset conversion. We use @ to remove warnings (mb_ functions are easily bitching about illegal chars)
1718 if( function_exists( 'mb_convert_encoding' ) ) {
1720 $title = @mb_convert_encoding( $title, 'UTF-8', $charset );
1722 $title = @mb_convert_encoding( $title, 'UTF-8' );
1726 // Remove HTML entities
1727 $title = html_entity_decode( $title, ENT_QUOTES, 'UTF-8' );
1729 // Strip out evil things
1730 $title = yourls_sanitize_title( $title );
1732 return yourls_apply_filter( 'get_remote_title', $title, $url );
1736 * Quick UA check for mobile devices. Return boolean.
1739 function yourls_is_mobile_device() {
1742 'android', 'blackberry', 'blazer',
1743 'compal', 'elaine', 'fennec', 'hiptop',
1744 'iemobile', 'iphone', 'ipod', 'ipad',
1745 'iris', 'kindle', 'opera mobi', 'opera mini',
1746 'palm', 'phone', 'pocket', 'psp', 'symbian',
1747 'treo', 'wap', 'windows ce', 'windows phone'
1750 // Current user-agent
1751 $current = strtolower( $_SERVER['HTTP_USER_AGENT'] );
1754 $is_mobile = ( str_replace( $mobiles, '', $current ) != $current );
1755 return yourls_apply_filter( 'is_mobile_device', $is_mobile );
1759 * Get request in YOURLS base (eg in 'http://site.com/yourls/abcd' get 'abdc')
1762 function yourls_get_request() {
1763 // Allow plugins to short-circuit the whole function
1764 $pre = yourls_apply_filter( 'shunt_get_request', false );
1765 if ( false !== $pre )
1768 static $request = null;
1770 yourls_do_action( 'pre_get_request', $request );
1772 if( $request !== null )
1775 // Ignore protocol & www. prefix
1776 $root = str_replace( array( 'https://', 'http://', 'https://www.', 'http://www.' ), '', YOURLS_SITE );
1777 // Case insensitive comparison of the YOURLS root to match both http://Sho.rt/blah and http://sho.rt/blah
1778 $request = preg_replace( "!$root/!i", '', $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 1 );
1780 // Unless request looks like a full URL (ie request is a simple keyword) strip query string
1781 if( !preg_match( "@^[a-zA-Z]+://.+@", $request ) ) {
1782 $request = current( explode( '?', $request ) );
1785 return yourls_apply_filter( 'get_request', $request );
1789 * Change protocol to match current scheme used (http or https)
1792 function yourls_match_current_protocol( $url, $normal = 'http', $ssl = 'https' ) {
1793 if( yourls_is_ssl() )
1794 $url = str_replace( $normal, $ssl, $url );
1795 return yourls_apply_filter( 'match_current_protocol', $url );
1799 * Fix $_SERVER['REQUEST_URI'] variable for various setups. Stolen from WP.
1802 function yourls_fix_request_uri() {
1804 $default_server_values = array(
1805 'SERVER_SOFTWARE' => '',
1806 'REQUEST_URI' => '',
1808 $_SERVER = array_merge( $default_server_values, $_SERVER );
1810 // Fix for IIS when running with PHP ISAPI
1811 if ( empty( $_SERVER['REQUEST_URI'] ) || ( php_sapi_name() != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
1814 if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
1815 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
1817 // IIS Isapi_Rewrite
1818 else if ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
1819 $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
1821 // Use ORIG_PATH_INFO if there is no PATH_INFO
1822 if ( !isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) )
1823 $_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
1825 // Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
1826 if ( isset( $_SERVER['PATH_INFO'] ) ) {
1827 if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
1828 $_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
1830 $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
1833 // Append the query string if it exists and isn't null
1834 if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
1835 $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
1842 * Shutdown function, runs just before PHP shuts down execution. Stolen from WP
1845 function yourls_shutdown() {
1846 yourls_do_action( 'shutdown' );
1850 * Auto detect custom favicon in /user directory, fallback to YOURLS favicon, and echo/return its URL
1853 function yourls_favicon( $echo = true ) {
1854 static $favicon = null;
1855 if( $favicon !== null )
1859 // search for favicon.(gif|ico|png|jpg|svg)
1860 foreach( array( 'gif', 'ico', 'png', 'jpg', 'svg' ) as $ext ) {
1861 if( file_exists( YOURLS_USERDIR. '/favicon.' . $ext ) ) {
1862 $custom = 'favicon.' . $ext;
1868 $favicon = yourls_site_url( false, YOURLS_USERURL . '/' . $custom );
1870 $favicon = yourls_site_url( false ) . '/images/favicon.gif';
1878 * Check for maintenance mode. If yes, die. See yourls_maintenance_mode(). Stolen from WP.
1881 function yourls_check_maintenance_mode() {
1883 $file = YOURLS_ABSPATH . '/.maintenance' ;
1884 if ( !file_exists( $file ) || yourls_is_upgrading() || yourls_is_installing() )
1887 global $maintenance_start;
1890 // If the $maintenance_start timestamp is older than 10 minutes, don't die.
1891 if ( ( time() - $maintenance_start ) >= 600 )
1894 // Use any /user/maintenance.php file
1895 if( file_exists( YOURLS_USERDIR.'/maintenance.php' ) ) {
1896 include( YOURLS_USERDIR.'/maintenance.php' );
1900 // https://www.youtube.com/watch?v=Xw-m4jEY-Ns
1901 $title = yourls__( 'Service temporarily unavailable' );
1902 $message = yourls__( 'Our service is currently undergoing scheduled maintenance.' ) . "</p>\n<p>" .
1903 yourls__( 'Things should not last very long, thank you for your patience and please excuse the inconvenience' );
1904 yourls_die( $message, $title , 503 );
1909 * Return current admin page, or null if not an admin page
1911 * @return mixed string if admin page, null if not an admin page
1914 function yourls_current_admin_page() {
1915 if( yourls_is_admin() ) {
1916 $current = substr( yourls_get_request(), 6 );
1917 if( $current === false )
1918 $current = 'index.php'; // if current page is http://sho.rt/admin/ instead of http://sho.rt/admin/index.php
1926 * Check if a URL protocol is allowed
1928 * Checks a URL against a list of whitelisted protocols. Protocols must be defined with
1929 * their complete scheme name, ie 'stuff:' or 'stuff://' (for instance, 'mailto:' is a valid
1930 * protocol, 'mailto://' isn't, and 'http:' with no double slashed isn't either
1934 * @param string $url URL to be check
1935 * @param array $protocols Optional. Array of protocols, defaults to global $yourls_allowedprotocols
1936 * @return boolean true if protocol allowed, false otherwise
1938 function yourls_is_allowed_protocol( $url, $protocols = array() ) {
1939 if( ! $protocols ) {
1940 global $yourls_allowedprotocols;
1941 $protocols = $yourls_allowedprotocols;
1944 $protocol = yourls_get_protocol( $url );
1945 return yourls_apply_filter( 'is_allowed_protocol', in_array( $protocol, $protocols ), $url, $protocols );
1949 * Get protocol from a URL (eg mailto:, http:// ...)
1953 * @param string $url URL to be check
1954 * @return string Protocol, with slash slash if applicable. Empty string if no protocol
1956 function yourls_get_protocol( $url ) {
1957 preg_match( '!^[a-zA-Z0-9\+\.-]+:(//)?!', $url, $matches );
1959 http://en.wikipedia.org/wiki/URI_scheme#Generic_syntax
1960 The scheme name consists of a sequence of characters beginning with a letter and followed by any
1961 combination of letters, digits, plus ("+"), period ("."), or hyphen ("-"). Although schemes are
1962 case-insensitive, the canonical form is lowercase and documents that specify schemes must do so
1963 with lowercase letters. It is followed by a colon (":").
1965 $protocol = ( isset( $matches[0] ) ? $matches[0] : '' );
1966 return yourls_apply_filter( 'get_protocol', $protocol, $url );
1970 * Get relative URL (eg 'abc' from 'http://sho.rt/abc')
1972 * Treat indifferently http & https. If a URL isn't relative to the YOURLS install, return it as is
1973 * or return empty string if $strict is true
1976 * @param string $url URL to relativize
1977 * @param bool $strict if true and if URL isn't relative to YOURLS install, return empty string
1978 * @return string URL
1980 function yourls_get_relative_url( $url, $strict = true ) {
1981 $url = yourls_sanitize_url( $url );
1983 // Remove protocols to make it easier
1984 $noproto_url = str_replace( 'https:', 'http:', $url );
1985 $noproto_site = str_replace( 'https:', 'http:', YOURLS_SITE );
1987 // Trim URL from YOURLS root URL : if no modification made, URL wasn't relative
1988 $_url = str_replace( $noproto_site . '/', '', $noproto_url );
1989 if( $_url == $noproto_url )
1990 $_url = ( $strict ? '' : $url );
1992 return yourls_apply_filter( 'get_relative_url', $_url, $url );
1996 * Marks a function as deprecated and informs when it has been used. Stolen from WP.
1998 * There is a hook deprecated_function that will be called that can be used
1999 * to get the backtrace up to what file and function called the deprecated
2002 * The current behavior is to trigger a user error if YOURLS_DEBUG is true.
2004 * This function is to be used in every function that is deprecated.
2007 * @uses yourls_do_action() Calls 'deprecated_function' and passes the function name, what to use instead,
2008 * and the version the function was deprecated in.
2009 * @uses yourls_apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do
2010 * trigger or false to not trigger error.
2012 * @param string $function The function that was called
2013 * @param string $version The version of WordPress that deprecated the function
2014 * @param string $replacement Optional. The function that should have been called
2016 function yourls_deprecated_function( $function, $version, $replacement = null ) {
2018 yourls_do_action( 'deprecated_function', $function, $replacement, $version );
2020 // Allow plugin to filter the output error trigger
2021 if ( YOURLS_DEBUG && yourls_apply_filters( 'deprecated_function_trigger_error', true ) ) {
2022 if ( ! is_null( $replacement ) )
2023 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) );
2025 trigger_error( sprintf( yourls__('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
2030 * Return the value if not an empty string
2032 * Used with array_filter(), to remove empty keys but not keys with value 0 or false
2035 * @param mixed $val Value to test against ''
2036 * @return bool True if not an empty string
2038 function yourls_return_if_not_empty_string( $val ) {
2039 return( $val !== '' );