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1 <?php 2 /** 3 * Canonical API to handle WordPress Redirecting 4 * 5 * Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference" 6 * by Mark Jaquith 7 * 8 * @package WordPress 9 * @since 2.3.0 10 */ 11 12 /** 13 * Redirects incoming links to the proper URL based on the site url. 14 * 15 * Search engines consider www.somedomain.com and somedomain.com to be two 16 * different URLs when they both go to the same location. This SEO enhancement 17 * prevents penalty for duplicate content by redirecting all incoming links to 18 * one or the other. 19 * 20 * Prevents redirection for feeds, trackbacks, searches, and 21 * admin URLs. Does not redirect on non-pretty-permalink-supporting IIS 7+, 22 * page/post previews, WP admin, Trackbacks, robots.txt, favicon.ico, searches, 23 * or on POST requests. 24 * 25 * Will also attempt to find the correct link when a user enters a URL that does 26 * not exist based on exact WordPress query. Will instead try to parse the URL 27 * or query in an attempt to figure the correct page to go to. 28 * 29 * @since 2.3.0 30 * 31 * @global WP_Rewrite $wp_rewrite WordPress rewrite component. 32 * @global bool $is_IIS 33 * @global WP_Query $wp_query WordPress Query object. 34 * @global wpdb $wpdb WordPress database abstraction object. 35 * @global WP $wp Current WordPress environment instance. 36 * 37 * @param string $requested_url Optional. The URL that was requested, used to 38 * figure if redirect is needed. 39 * @param bool $do_redirect Optional. Redirect to the new URL. 40 * @return string|void The string of the URL, if redirect needed. 41 */ 42 function redirect_canonical( $requested_url = null, $do_redirect = true ) { 43 global $wp_rewrite, $is_IIS, $wp_query, $wpdb, $wp; 44 45 if ( isset( $_SERVER['REQUEST_METHOD'] ) && ! in_array( strtoupper( $_SERVER['REQUEST_METHOD'] ), array( 'GET', 'HEAD' ) ) ) { 46 return; 47 } 48 49 // If we're not in wp-admin and the post has been published and preview nonce 50 // is non-existent or invalid then no need for preview in query 51 if ( is_preview() && get_query_var( 'p' ) && 'publish' == get_post_status( get_query_var( 'p' ) ) ) { 52 if ( ! isset( $_GET['preview_id'] ) 53 || ! isset( $_GET['preview_nonce'] ) 54 || ! wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . (int) $_GET['preview_id'] ) ) { 55 $wp_query->is_preview = false; 56 } 57 } 58 59 if ( is_trackback() || is_search() || is_admin() || is_preview() || is_robots() || is_favicon() || ( $is_IIS && ! iis7_supports_permalinks() ) ) { 60 return; 61 } 62 63 if ( ! $requested_url && isset( $_SERVER['HTTP_HOST'] ) ) { 64 // build the URL in the address bar 65 $requested_url = is_ssl() ? 'https://' : 'http://'; 66 $requested_url .= $_SERVER['HTTP_HOST']; 67 $requested_url .= $_SERVER['REQUEST_URI']; 68 } 69 70 $original = @parse_url( $requested_url ); 71 if ( false === $original ) { 72 return; 73 } 74 75 $redirect = $original; 76 $redirect_url = false; 77 78 // Notice fixing 79 if ( ! isset( $redirect['path'] ) ) { 80 $redirect['path'] = ''; 81 } 82 if ( ! isset( $redirect['query'] ) ) { 83 $redirect['query'] = ''; 84 } 85 86 // If the original URL ended with non-breaking spaces, they were almost 87 // certainly inserted by accident. Let's remove them, so the reader doesn't 88 // see a 404 error with no obvious cause. 89 $redirect['path'] = preg_replace( '|(%C2%A0)+$|i', '', $redirect['path'] ); 90 91 // It's not a preview, so remove it from URL 92 if ( get_query_var( 'preview' ) ) { 93 $redirect['query'] = remove_query_arg( 'preview', $redirect['query'] ); 94 } 95 96 $id = get_query_var( 'p' ); 97 98 if ( is_feed() && $id ) { 99 $redirect_url = get_post_comments_feed_link( $id, get_query_var( 'feed' ) ); 100 if ( $redirect_url ) { 101 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type', 'feed' ), $redirect_url ); 102 $redirect['path'] = parse_url( $redirect_url, PHP_URL_PATH ); 103 } 104 } 105 106 if ( is_singular() && 1 > $wp_query->post_count && $id ) { 107 108 $vars = $wpdb->get_results( $wpdb->prepare( "SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id ) ); 109 110 if ( ! empty( $vars[0] ) ) { 111 $vars = $vars[0]; 112 if ( 'revision' == $vars->post_type && $vars->post_parent > 0 ) { 113 $id = $vars->post_parent; 114 } 115 116 $redirect_url = get_permalink( $id ); 117 if ( $redirect_url ) { 118 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), $redirect_url ); 119 } 120 } 121 } 122 123 // These tests give us a WP-generated permalink 124 if ( is_404() ) { 125 126 // Redirect ?page_id, ?p=, ?attachment_id= to their respective url's 127 $id = max( get_query_var( 'p' ), get_query_var( 'page_id' ), get_query_var( 'attachment_id' ) ); 128 $redirect_post = $id ? get_post( $id ) : false; 129 if ( $redirect_post ) { 130 $post_type_obj = get_post_type_object( $redirect_post->post_type ); 131 if ( $post_type_obj->public && 'auto-draft' != $redirect_post->post_status ) { 132 $redirect_url = get_permalink( $redirect_post ); 133 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), $redirect_url ); 134 } 135 } 136 137 if ( get_query_var( 'day' ) && get_query_var( 'monthnum' ) && get_query_var( 'year' ) ) { 138 $year = get_query_var( 'year' ); 139 $month = get_query_var( 'monthnum' ); 140 $day = get_query_var( 'day' ); 141 $date = sprintf( '%04d-%02d-%02d', $year, $month, $day ); 142 if ( ! wp_checkdate( $month, $day, $year, $date ) ) { 143 $redirect_url = get_month_link( $year, $month ); 144 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'year', 'monthnum', 'day' ), $redirect_url ); 145 } 146 } elseif ( get_query_var( 'monthnum' ) && get_query_var( 'year' ) && 12 < get_query_var( 'monthnum' ) ) { 147 $redirect_url = get_year_link( get_query_var( 'year' ) ); 148 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'year', 'monthnum' ), $redirect_url ); 149 } 150 151 if ( ! $redirect_url ) { 152 $redirect_url = redirect_guess_404_permalink(); 153 if ( $redirect_url ) { 154 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'page', 'feed', 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), $redirect_url ); 155 } 156 } 157 158 if ( get_query_var( 'page' ) && $wp_query->post && 159 false !== strpos( $wp_query->post->post_content, '<!--nextpage-->' ) ) { 160 $redirect['path'] = rtrim( $redirect['path'], (int) get_query_var( 'page' ) . '/' ); 161 $redirect['query'] = remove_query_arg( 'page', $redirect['query'] ); 162 $redirect_url = get_permalink( $wp_query->post->ID ); 163 } 164 } elseif ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) { 165 // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101 166 if ( is_attachment() && 167 ! array_diff( array_keys( $wp->query_vars ), array( 'attachment', 'attachment_id' ) ) && 168 ! $redirect_url ) { 169 if ( ! empty( $_GET['attachment_id'] ) ) { 170 $redirect_url = get_attachment_link( get_query_var( 'attachment_id' ) ); 171 if ( $redirect_url ) { 172 $redirect['query'] = remove_query_arg( 'attachment_id', $redirect['query'] ); 173 } 174 } else { 175 $redirect_url = get_attachment_link(); 176 } 177 } elseif ( is_single() && ! empty( $_GET['p'] ) && ! $redirect_url ) { 178 $redirect_url = get_permalink( get_query_var( 'p' ) ); 179 if ( $redirect_url ) { 180 $redirect['query'] = remove_query_arg( array( 'p', 'post_type' ), $redirect['query'] ); 181 } 182 } elseif ( is_single() && ! empty( $_GET['name'] ) && ! $redirect_url ) { 183 $redirect_url = get_permalink( $wp_query->get_queried_object_id() ); 184 if ( $redirect_url ) { 185 $redirect['query'] = remove_query_arg( 'name', $redirect['query'] ); 186 } 187 } elseif ( is_page() && ! empty( $_GET['page_id'] ) && ! $redirect_url ) { 188 $redirect_url = get_permalink( get_query_var( 'page_id' ) ); 189 if ( $redirect_url ) { 190 $redirect['query'] = remove_query_arg( 'page_id', $redirect['query'] ); 191 } 192 } elseif ( is_page() && ! is_feed() && 'page' == get_option( 'show_on_front' ) && get_queried_object_id() == get_option( 'page_on_front' ) && ! $redirect_url ) { 193 $redirect_url = home_url( '/' ); 194 } elseif ( is_home() && ! empty( $_GET['page_id'] ) && 'page' == get_option( 'show_on_front' ) && get_query_var( 'page_id' ) == get_option( 'page_for_posts' ) && ! $redirect_url ) { 195 $redirect_url = get_permalink( get_option( 'page_for_posts' ) ); 196 if ( $redirect_url ) { 197 $redirect['query'] = remove_query_arg( 'page_id', $redirect['query'] ); 198 } 199 } elseif ( ! empty( $_GET['m'] ) && ( is_year() || is_month() || is_day() ) ) { 200 $m = get_query_var( 'm' ); 201 switch ( strlen( $m ) ) { 202 case 4: // Yearly 203 $redirect_url = get_year_link( $m ); 204 break; 205 case 6: // Monthly 206 $redirect_url = get_month_link( substr( $m, 0, 4 ), substr( $m, 4, 2 ) ); 207 break; 208 case 8: // Daily 209 $redirect_url = get_day_link( substr( $m, 0, 4 ), substr( $m, 4, 2 ), substr( $m, 6, 2 ) ); 210 break; 211 } 212 if ( $redirect_url ) { 213 $redirect['query'] = remove_query_arg( 'm', $redirect['query'] ); 214 } 215 // now moving on to non ?m=X year/month/day links 216 } elseif ( is_day() && get_query_var( 'year' ) && get_query_var( 'monthnum' ) && ! empty( $_GET['day'] ) ) { 217 $redirect_url = get_day_link( get_query_var( 'year' ), get_query_var( 'monthnum' ), get_query_var( 'day' ) ); 218 if ( $redirect_url ) { 219 $redirect['query'] = remove_query_arg( array( 'year', 'monthnum', 'day' ), $redirect['query'] ); 220 } 221 } elseif ( is_month() && get_query_var( 'year' ) && ! empty( $_GET['monthnum'] ) ) { 222 $redirect_url = get_month_link( get_query_var( 'year' ), get_query_var( 'monthnum' ) ); 223 if ( $redirect_url ) { 224 $redirect['query'] = remove_query_arg( array( 'year', 'monthnum' ), $redirect['query'] ); 225 } 226 } elseif ( is_year() && ! empty( $_GET['year'] ) ) { 227 $redirect_url = get_year_link( get_query_var( 'year' ) ); 228 if ( $redirect_url ) { 229 $redirect['query'] = remove_query_arg( 'year', $redirect['query'] ); 230 } 231 } elseif ( is_author() && ! empty( $_GET['author'] ) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) { 232 $author = get_userdata( get_query_var( 'author' ) ); 233 if ( ( false !== $author ) && $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE $wpdb->posts.post_author = %d AND $wpdb->posts.post_status = 'publish' LIMIT 1", $author->ID ) ) ) { 234 $redirect_url = get_author_posts_url( $author->ID, $author->user_nicename ); 235 if ( $redirect_url ) { 236 $redirect['query'] = remove_query_arg( 'author', $redirect['query'] ); 237 } 238 } 239 } elseif ( is_category() || is_tag() || is_tax() ) { // Terms (Tags/categories) 240 241 $term_count = 0; 242 foreach ( $wp_query->tax_query->queried_terms as $tax_query ) { 243 $term_count += count( $tax_query['terms'] ); 244 } 245 246 $obj = $wp_query->get_queried_object(); 247 if ( $term_count <= 1 && ! empty( $obj->term_id ) ) { 248 $tax_url = get_term_link( (int) $obj->term_id, $obj->taxonomy ); 249 if ( $tax_url && ! is_wp_error( $tax_url ) ) { 250 if ( ! empty( $redirect['query'] ) ) { 251 // Strip taxonomy query vars off the url. 252 $qv_remove = array( 'term', 'taxonomy' ); 253 if ( is_category() ) { 254 $qv_remove[] = 'category_name'; 255 $qv_remove[] = 'cat'; 256 } elseif ( is_tag() ) { 257 $qv_remove[] = 'tag'; 258 $qv_remove[] = 'tag_id'; 259 } else { // Custom taxonomies will have a custom query var, remove those too: 260 $tax_obj = get_taxonomy( $obj->taxonomy ); 261 if ( false !== $tax_obj->query_var ) { 262 $qv_remove[] = $tax_obj->query_var; 263 } 264 } 265 266 $rewrite_vars = array_diff( array_keys( $wp_query->query ), array_keys( $_GET ) ); 267 268 if ( ! array_diff( $rewrite_vars, array_keys( $_GET ) ) ) { // Check to see if all the Query vars are coming from the rewrite, none are set via $_GET 269 $redirect['query'] = remove_query_arg( $qv_remove, $redirect['query'] ); //Remove all of the per-tax qv's 270 271 // Create the destination url for this taxonomy 272 $tax_url = parse_url( $tax_url ); 273 if ( ! empty( $tax_url['query'] ) ) { // Taxonomy accessible via ?taxonomy=..&term=.. or any custom qv.. 274 parse_str( $tax_url['query'], $query_vars ); 275 $redirect['query'] = add_query_arg( $query_vars, $redirect['query'] ); 276 } else { // Taxonomy is accessible via a "pretty-URL" 277 $redirect['path'] = $tax_url['path']; 278 } 279 } else { // Some query vars are set via $_GET. Unset those from $_GET that exist via the rewrite 280 foreach ( $qv_remove as $_qv ) { 281 if ( isset( $rewrite_vars[ $_qv ] ) ) { 282 $redirect['query'] = remove_query_arg( $_qv, $redirect['query'] ); 283 } 284 } 285 } 286 } 287 } 288 } 289 } elseif ( is_single() && strpos( $wp_rewrite->permalink_structure, '%category%' ) !== false ) { 290 $cat = get_query_var( 'category_name' ); 291 if ( $cat ) { 292 $category = get_category_by_path( $cat ); 293 if ( ( ! $category || is_wp_error( $category ) ) || ! has_term( $category->term_id, 'category', $wp_query->get_queried_object_id() ) ) { 294 $redirect_url = get_permalink( $wp_query->get_queried_object_id() ); 295 } 296 } 297 } 298 299 // Post Paging 300 if ( is_singular() && get_query_var( 'page' ) ) { 301 if ( ! $redirect_url ) { 302 $redirect_url = get_permalink( get_queried_object_id() ); 303 } 304 305 $page = get_query_var( 'page' ); 306 if ( $page > 1 ) { 307 if ( is_front_page() ) { 308 $redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( "$wp_rewrite->pagination_base/$page", 'paged' ); 309 } else { 310 $redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( $page, 'single_paged' ); 311 } 312 } 313 $redirect['query'] = remove_query_arg( 'page', $redirect['query'] ); 314 } 315 316 // paging and feeds 317 if ( get_query_var( 'paged' ) || is_feed() || get_query_var( 'cpage' ) ) { 318 while ( preg_match( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", $redirect['path'] ) || preg_match( '#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $redirect['path'] ) || preg_match( "#/{$wp_rewrite->comments_pagination_base}-[0-9]+(/+)?$#", $redirect['path'] ) ) { 319 // Strip off paging and feed 320 $redirect['path'] = preg_replace( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", '/', $redirect['path'] ); // strip off any existing paging 321 $redirect['path'] = preg_replace( '#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path'] ); // strip off feed endings 322 $redirect['path'] = preg_replace( "#/{$wp_rewrite->comments_pagination_base}-[0-9]+?(/+)?$#", '/', $redirect['path'] ); // strip off any existing comment paging 323 } 324 325 $addl_path = ''; 326 if ( is_feed() && in_array( get_query_var( 'feed' ), $wp_rewrite->feeds ) ) { 327 $addl_path = ! empty( $addl_path ) ? trailingslashit( $addl_path ) : ''; 328 if ( ! is_singular() && get_query_var( 'withcomments' ) ) { 329 $addl_path .= 'comments/'; 330 } 331 if ( ( 'rss' == get_default_feed() && 'feed' == get_query_var( 'feed' ) ) || 'rss' == get_query_var( 'feed' ) ) { 332 $addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == 'rss2' ) ? '' : 'rss2' ), 'feed' ); 333 } else { 334 $addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == get_query_var( 'feed' ) || 'feed' == get_query_var( 'feed' ) ) ? '' : get_query_var( 'feed' ) ), 'feed' ); 335 } 336 $redirect['query'] = remove_query_arg( 'feed', $redirect['query'] ); 337 } elseif ( is_feed() && 'old' == get_query_var( 'feed' ) ) { 338 $old_feed_files = array( 339 'wp-atom.php' => 'atom', 340 'wp-commentsrss2.php' => 'comments_rss2', 341 'wp-feed.php' => get_default_feed(), 342 'wp-rdf.php' => 'rdf', 343 'wp-rss.php' => 'rss2', 344 'wp-rss2.php' => 'rss2', 345 ); 346 if ( isset( $old_feed_files[ basename( $redirect['path'] ) ] ) ) { 347 $redirect_url = get_feed_link( $old_feed_files[ basename( $redirect['path'] ) ] ); 348 wp_redirect( $redirect_url, 301 ); 349 die(); 350 } 351 } 352 353 if ( get_query_var( 'paged' ) > 0 ) { 354 $paged = get_query_var( 'paged' ); 355 $redirect['query'] = remove_query_arg( 'paged', $redirect['query'] ); 356 if ( ! is_feed() ) { 357 if ( $paged > 1 && ! is_single() ) { 358 $addl_path = ( ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '' ) . user_trailingslashit( "$wp_rewrite->pagination_base/$paged", 'paged' ); 359 } elseif ( ! is_single() ) { 360 $addl_path = ! empty( $addl_path ) ? trailingslashit( $addl_path ) : ''; 361 } 362 } elseif ( $paged > 1 ) { 363 $redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] ); 364 } 365 } 366 367 if ( get_option( 'page_comments' ) && ( 368 ( 'newest' == get_option( 'default_comments_page' ) && get_query_var( 'cpage' ) > 0 ) || 369 ( 'newest' != get_option( 'default_comments_page' ) && get_query_var( 'cpage' ) > 1 ) 370 ) ) { 371 $addl_path = ( ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '' ) . user_trailingslashit( $wp_rewrite->comments_pagination_base . '-' . get_query_var( 'cpage' ), 'commentpaged' ); 372 $redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] ); 373 } 374 375 $redirect['path'] = user_trailingslashit( preg_replace( '|/' . preg_quote( $wp_rewrite->index, '|' ) . '/?$|', '/', $redirect['path'] ) ); // strip off trailing /index.php/ 376 if ( ! empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos( $redirect['path'], '/' . $wp_rewrite->index . '/' ) === false ) { 377 $redirect['path'] = trailingslashit( $redirect['path'] ) . $wp_rewrite->index . '/'; 378 } 379 if ( ! empty( $addl_path ) ) { 380 $redirect['path'] = trailingslashit( $redirect['path'] ) . $addl_path; 381 } 382 $redirect_url = $redirect['scheme'] . '://' . $redirect['host'] . $redirect['path']; 383 } 384 385 if ( 'wp-register.php' == basename( $redirect['path'] ) ) { 386 if ( is_multisite() ) { 387 /** This filter is documented in wp-login.php */ 388 $redirect_url = apply_filters( 'wp_signup_location', network_site_url( 'wp-signup.php' ) ); 389 } else { 390 $redirect_url = wp_registration_url(); 391 } 392 393 wp_redirect( $redirect_url, 301 ); 394 die(); 395 } 396 } 397 398 // tack on any additional query vars 399 $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] ); 400 if ( $redirect_url && ! empty( $redirect['query'] ) ) { 401 parse_str( $redirect['query'], $_parsed_query ); 402 $redirect = @parse_url( $redirect_url ); 403 404 if ( ! empty( $_parsed_query['name'] ) && ! empty( $redirect['query'] ) ) { 405 parse_str( $redirect['query'], $_parsed_redirect_query ); 406 407 if ( empty( $_parsed_redirect_query['name'] ) ) { 408 unset( $_parsed_query['name'] ); 409 } 410 } 411 412 $_parsed_query = array_combine( 413 rawurlencode_deep( array_keys( $_parsed_query ) ), 414 rawurlencode_deep( array_values( $_parsed_query ) ) 415 ); 416 $redirect_url = add_query_arg( $_parsed_query, $redirect_url ); 417 } 418 419 if ( $redirect_url ) { 420 $redirect = @parse_url( $redirect_url ); 421 } 422 423 // www.example.com vs example.com 424 $user_home = @parse_url( home_url() ); 425 if ( ! empty( $user_home['host'] ) ) { 426 $redirect['host'] = $user_home['host']; 427 } 428 if ( empty( $user_home['path'] ) ) { 429 $user_home['path'] = '/'; 430 } 431 432 // Handle ports 433 if ( ! empty( $user_home['port'] ) ) { 434 $redirect['port'] = $user_home['port']; 435 } else { 436 unset( $redirect['port'] ); 437 } 438 439 // trailing /index.php 440 $redirect['path'] = preg_replace( '|/' . preg_quote( $wp_rewrite->index, '|' ) . '/*?$|', '/', $redirect['path'] ); 441 442 $punctuation_pattern = implode( 443 '|', 444 array_map( 445 'preg_quote', 446 array( 447 ' ', 448 '%20', // space 449 '!', 450 '%21', // exclamation mark 451 '"', 452 '%22', // double quote 453 "'", 454 '%27', // single quote 455 '(', 456 '%28', // opening bracket 457 ')', 458 '%29', // closing bracket 459 ',', 460 '%2C', // comma 461 '.', 462 '%2E', // period 463 ';', 464 '%3B', // semicolon 465 '{', 466 '%7B', // opening curly bracket 467 '}', 468 '%7D', // closing curly bracket 469 '%E2%80%9C', // opening curly quote 470 '%E2%80%9D', // closing curly quote 471 ) 472 ) 473 ); 474 475 // Remove trailing spaces and end punctuation from the path. 476 $redirect['path'] = preg_replace( "#($punctuation_pattern)+$#", '', $redirect['path'] ); 477 478 if ( ! empty( $redirect['query'] ) ) { 479 // Remove trailing spaces and end punctuation from certain terminating query string args. 480 $redirect['query'] = preg_replace( "#((p|page_id|cat|tag)=[^&]*?)($punctuation_pattern)+$#", '$1', $redirect['query'] ); 481 482 // Clean up empty query strings 483 $redirect['query'] = trim( preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query'] ), '&' ); 484 485 // Redirect obsolete feeds 486 $redirect['query'] = preg_replace( '#(^|&)feed=rss(&|$)#', '$1feed=rss2$2', $redirect['query'] ); 487 488 // Remove redundant leading ampersands 489 $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] ); 490 } 491 492 // strip /index.php/ when we're not using PATHINFO permalinks 493 if ( ! $wp_rewrite->using_index_permalinks() ) { 494 $redirect['path'] = str_replace( '/' . $wp_rewrite->index . '/', '/', $redirect['path'] ); 495 } 496 497 // trailing slashes 498 if ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() && ! is_404() && ( ! is_front_page() || ( is_front_page() && ( get_query_var( 'paged' ) > 1 ) ) ) ) { 499 $user_ts_type = ''; 500 if ( get_query_var( 'paged' ) > 0 ) { 501 $user_ts_type = 'paged'; 502 } else { 503 foreach ( array( 'single', 'category', 'page', 'day', 'month', 'year', 'home' ) as $type ) { 504 $func = 'is_' . $type; 505 if ( call_user_func( $func ) ) { 506 $user_ts_type = $type; 507 break; 508 } 509 } 510 } 511 $redirect['path'] = user_trailingslashit( $redirect['path'], $user_ts_type ); 512 } elseif ( is_front_page() ) { 513 $redirect['path'] = trailingslashit( $redirect['path'] ); 514 } 515 516 // Strip multiple slashes out of the URL 517 if ( strpos( $redirect['path'], '//' ) > -1 ) { 518 $redirect['path'] = preg_replace( '|/+|', '/', $redirect['path'] ); 519 } 520 521 // Always trailing slash the Front Page URL 522 if ( trailingslashit( $redirect['path'] ) == trailingslashit( $user_home['path'] ) ) { 523 $redirect['path'] = trailingslashit( $redirect['path'] ); 524 } 525 526 // Ignore differences in host capitalization, as this can lead to infinite redirects 527 // Only redirect no-www <=> yes-www 528 if ( strtolower( $original['host'] ) == strtolower( $redirect['host'] ) || 529 ( strtolower( $original['host'] ) != 'www.' . strtolower( $redirect['host'] ) && 'www.' . strtolower( $original['host'] ) != strtolower( $redirect['host'] ) ) ) { 530 $redirect['host'] = $original['host']; 531 } 532 533 $compare_original = array( $original['host'], $original['path'] ); 534 535 if ( ! empty( $original['port'] ) ) { 536 $compare_original[] = $original['port']; 537 } 538 539 if ( ! empty( $original['query'] ) ) { 540 $compare_original[] = $original['query']; 541 } 542 543 $compare_redirect = array( $redirect['host'], $redirect['path'] ); 544 545 if ( ! empty( $redirect['port'] ) ) { 546 $compare_redirect[] = $redirect['port']; 547 } 548 549 if ( ! empty( $redirect['query'] ) ) { 550 $compare_redirect[] = $redirect['query']; 551 } 552 553 if ( $compare_original !== $compare_redirect ) { 554 $redirect_url = $redirect['scheme'] . '://' . $redirect['host']; 555 if ( ! empty( $redirect['port'] ) ) { 556 $redirect_url .= ':' . $redirect['port']; 557 } 558 $redirect_url .= $redirect['path']; 559 if ( ! empty( $redirect['query'] ) ) { 560 $redirect_url .= '?' . $redirect['query']; 561 } 562 } 563 564 if ( ! $redirect_url || $redirect_url == $requested_url ) { 565 return; 566 } 567 568 // Hex encoded octets are case-insensitive. 569 if ( false !== strpos( $requested_url, '%' ) ) { 570 if ( ! function_exists( 'lowercase_octets' ) ) { 571 /** 572 * Converts the first hex-encoded octet match to lowercase. 573 * 574 * @since 3.1.0 575 * @ignore 576 * 577 * @param array $matches Hex-encoded octet matches for the requested URL. 578 * @return string Lowercased version of the first match. 579 */ 580 function lowercase_octets( $matches ) { 581 return strtolower( $matches[0] ); 582 } 583 } 584 $requested_url = preg_replace_callback( '|%[a-fA-F0-9][a-fA-F0-9]|', 'lowercase_octets', $requested_url ); 585 } 586 587 /** 588 * Filters the canonical redirect URL. 589 * 590 * Returning false to this filter will cancel the redirect. 591 * 592 * @since 2.3.0 593 * 594 * @param string $redirect_url The redirect URL. 595 * @param string $requested_url The requested URL. 596 */ 597 $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url ); 598 599 // yes, again -- in case the filter aborted the request 600 if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) == strip_fragment_from_url( $requested_url ) ) { 601 return; 602 } 603 604 if ( $do_redirect ) { 605 // protect against chained redirects 606 if ( ! redirect_canonical( $redirect_url, false ) ) { 607 wp_redirect( $redirect_url, 301 ); 608 exit(); 609 } else { 610 // Debug 611 // die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) ); 612 return; 613 } 614 } else { 615 return $redirect_url; 616 } 617 } 618 619 /** 620 * Removes arguments from a query string if they are not present in a URL 621 * DO NOT use this in plugin code. 622 * 623 * @since 3.4.0 624 * @access private 625 * 626 * @param string $query_string 627 * @param array $args_to_check 628 * @param string $url 629 * @return string The altered query string 630 */ 631 function _remove_qs_args_if_not_in_url( $query_string, array $args_to_check, $url ) { 632 $parsed_url = @parse_url( $url ); 633 if ( ! empty( $parsed_url['query'] ) ) { 634 parse_str( $parsed_url['query'], $parsed_query ); 635 foreach ( $args_to_check as $qv ) { 636 if ( ! isset( $parsed_query[ $qv ] ) ) { 637 $query_string = remove_query_arg( $qv, $query_string ); 638 } 639 } 640 } else { 641 $query_string = remove_query_arg( $args_to_check, $query_string ); 642 } 643 return $query_string; 644 } 645 646 /** 647 * Strips the #fragment from a URL, if one is present. 648 * 649 * @since 4.4.0 650 * 651 * @param string $url The URL to strip. 652 * @return string The altered URL. 653 */ 654 function strip_fragment_from_url( $url ) { 655 $parsed_url = @parse_url( $url ); 656 if ( ! empty( $parsed_url['host'] ) ) { 657 // This mirrors code in redirect_canonical(). It does not handle every case. 658 $url = $parsed_url['scheme'] . '://' . $parsed_url['host']; 659 if ( ! empty( $parsed_url['port'] ) ) { 660 $url .= ':' . $parsed_url['port']; 661 } 662 663 if ( ! empty( $parsed_url['path'] ) ) { 664 $url .= $parsed_url['path']; 665 } 666 667 if ( ! empty( $parsed_url['query'] ) ) { 668 $url .= '?' . $parsed_url['query']; 669 } 670 } 671 672 return $url; 673 } 674 675 /** 676 * Attempts to guess the correct URL based on query vars 677 * 678 * @since 2.3.0 679 * 680 * @global wpdb $wpdb WordPress database abstraction object. 681 * 682 * @return string|false The correct URL if one is found. False on failure. 683 */ 684 function redirect_guess_404_permalink() { 685 global $wpdb; 686 687 if ( get_query_var( 'name' ) ) { 688 $where = $wpdb->prepare( 'post_name LIKE %s', $wpdb->esc_like( get_query_var( 'name' ) ) . '%' ); 689 690 // if any of post_type, year, monthnum, or day are set, use them to refine the query 691 if ( get_query_var( 'post_type' ) ) { 692 $where .= $wpdb->prepare( ' AND post_type = %s', get_query_var( 'post_type' ) ); 693 } else { 694 $where .= " AND post_type IN ('" . implode( "', '", get_post_types( array( 'public' => true ) ) ) . "')"; 695 } 696 697 if ( get_query_var( 'year' ) ) { 698 $where .= $wpdb->prepare( ' AND YEAR(post_date) = %d', get_query_var( 'year' ) ); 699 } 700 if ( get_query_var( 'monthnum' ) ) { 701 $where .= $wpdb->prepare( ' AND MONTH(post_date) = %d', get_query_var( 'monthnum' ) ); 702 } 703 if ( get_query_var( 'day' ) ) { 704 $where .= $wpdb->prepare( ' AND DAYOFMONTH(post_date) = %d', get_query_var( 'day' ) ); 705 } 706 707 $post_id = $wpdb->get_var( "SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'" ); 708 if ( ! $post_id ) { 709 return false; 710 } 711 if ( get_query_var( 'feed' ) ) { 712 return get_post_comments_feed_link( $post_id, get_query_var( 'feed' ) ); 713 } elseif ( get_query_var( 'page' ) && 1 < get_query_var( 'page' ) ) { 714 return trailingslashit( get_permalink( $post_id ) ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' ); 715 } else { 716 return get_permalink( $post_id ); 717 } 718 } 719 720 return false; 721 } 722 723 /** 724 * Redirects a variety of shorthand URLs to the admin. 725 * 726 * If a user visits example.com/admin, they'll be redirected to /wp-admin. 727 * Visiting /login redirects to /wp-login.php, and so on. 728 * 729 * @since 3.4.0 730 * 731 * @global WP_Rewrite $wp_rewrite WordPress rewrite component. 732 */ 733 function wp_redirect_admin_locations() { 734 global $wp_rewrite; 735 if ( ! ( is_404() && $wp_rewrite->using_permalinks() ) ) { 736 return; 737 } 738 739 $admins = array( 740 home_url( 'wp-admin', 'relative' ), 741 home_url( 'dashboard', 'relative' ), 742 home_url( 'admin', 'relative' ), 743 site_url( 'dashboard', 'relative' ), 744 site_url( 'admin', 'relative' ), 745 ); 746 if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $admins ) ) { 747 wp_redirect( admin_url() ); 748 exit; 749 } 750 751 $logins = array( 752 home_url( 'wp-login.php', 'relative' ), 753 home_url( 'login', 'relative' ), 754 site_url( 'login', 'relative' ), 755 ); 756 if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $logins ) ) { 757 wp_redirect( wp_login_url() ); 758 exit; 759 } 760 }
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| Generated: Mon Jan 27 01:00:03 2020 | Cross-referenced by PHPXref 0.7.1 |