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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' ), true ) ) { 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 ) { 56 $wp_query->is_preview = false; 57 } 58 } 59 60 if ( is_admin() || is_search() || is_preview() || is_trackback() || is_favicon() 61 || ( $is_IIS && ! iis7_supports_permalinks() ) 62 ) { 63 return; 64 } 65 66 if ( ! $requested_url && isset( $_SERVER['HTTP_HOST'] ) ) { 67 // Build the URL in the address bar. 68 $requested_url = is_ssl() ? 'https://' : 'http://'; 69 $requested_url .= $_SERVER['HTTP_HOST']; 70 $requested_url .= $_SERVER['REQUEST_URI']; 71 } 72 73 $original = parse_url( $requested_url ); 74 if ( false === $original ) { 75 return; 76 } 77 78 $redirect = $original; 79 $redirect_url = false; 80 81 // Notice fixing. 82 if ( ! isset( $redirect['path'] ) ) { 83 $redirect['path'] = ''; 84 } 85 if ( ! isset( $redirect['query'] ) ) { 86 $redirect['query'] = ''; 87 } 88 89 /* 90 * If the original URL ended with non-breaking spaces, they were almost 91 * certainly inserted by accident. Let's remove them, so the reader doesn't 92 * see a 404 error with no obvious cause. 93 */ 94 $redirect['path'] = preg_replace( '|(%C2%A0)+$|i', '', $redirect['path'] ); 95 96 // It's not a preview, so remove it from URL. 97 if ( get_query_var( 'preview' ) ) { 98 $redirect['query'] = remove_query_arg( 'preview', $redirect['query'] ); 99 } 100 101 $post_id = get_query_var( 'p' ); 102 103 if ( is_feed() && $post_id ) { 104 $redirect_url = get_post_comments_feed_link( $post_id, get_query_var( 'feed' ) ); 105 106 if ( $redirect_url ) { 107 $redirect['query'] = _remove_qs_args_if_not_in_url( 108 $redirect['query'], 109 array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type', 'feed' ), 110 $redirect_url 111 ); 112 113 $redirect['path'] = parse_url( $redirect_url, PHP_URL_PATH ); 114 } 115 } 116 117 if ( is_singular() && $wp_query->post_count < 1 && $post_id ) { 118 119 $vars = $wpdb->get_results( $wpdb->prepare( "SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $post_id ) ); 120 121 if ( ! empty( $vars[0] ) ) { 122 $vars = $vars[0]; 123 124 if ( 'revision' === $vars->post_type && $vars->post_parent > 0 ) { 125 $post_id = $vars->post_parent; 126 } 127 128 $redirect_url = get_permalink( $post_id ); 129 130 if ( $redirect_url ) { 131 $redirect['query'] = _remove_qs_args_if_not_in_url( 132 $redirect['query'], 133 array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), 134 $redirect_url 135 ); 136 } 137 } 138 } 139 140 // These tests give us a WP-generated permalink. 141 if ( is_404() ) { 142 143 // Redirect ?page_id, ?p=, ?attachment_id= to their respective URLs. 144 $post_id = max( get_query_var( 'p' ), get_query_var( 'page_id' ), get_query_var( 'attachment_id' ) ); 145 146 $redirect_post = $post_id ? get_post( $post_id ) : false; 147 148 if ( $redirect_post ) { 149 $post_type_obj = get_post_type_object( $redirect_post->post_type ); 150 151 if ( $post_type_obj->public && 'auto-draft' !== $redirect_post->post_status ) { 152 $redirect_url = get_permalink( $redirect_post ); 153 154 $redirect['query'] = _remove_qs_args_if_not_in_url( 155 $redirect['query'], 156 array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), 157 $redirect_url 158 ); 159 } 160 } 161 162 $year = get_query_var( 'year' ); 163 $month = get_query_var( 'monthnum' ); 164 $day = get_query_var( 'day' ); 165 166 if ( $year && $month && $day ) { 167 $date = sprintf( '%04d-%02d-%02d', $year, $month, $day ); 168 169 if ( ! wp_checkdate( $month, $day, $year, $date ) ) { 170 $redirect_url = get_month_link( $year, $month ); 171 172 $redirect['query'] = _remove_qs_args_if_not_in_url( 173 $redirect['query'], 174 array( 'year', 'monthnum', 'day' ), 175 $redirect_url 176 ); 177 } 178 } elseif ( $year && $month && $month > 12 ) { 179 $redirect_url = get_year_link( $year ); 180 181 $redirect['query'] = _remove_qs_args_if_not_in_url( 182 $redirect['query'], 183 array( 'year', 'monthnum' ), 184 $redirect_url 185 ); 186 } 187 188 // Strip off non-existing <!--nextpage--> links from single posts or pages. 189 if ( get_query_var( 'page' ) ) { 190 $post_id = 0; 191 192 if ( $wp_query->queried_object instanceof WP_Post ) { 193 $post_id = $wp_query->queried_object->ID; 194 } elseif ( $wp_query->post ) { 195 $post_id = $wp_query->post->ID; 196 } 197 198 if ( $post_id ) { 199 $redirect_url = get_permalink( $post_id ); 200 201 $redirect['path'] = rtrim( $redirect['path'], (int) get_query_var( 'page' ) . '/' ); 202 $redirect['query'] = remove_query_arg( 'page', $redirect['query'] ); 203 } 204 } 205 206 if ( ! $redirect_url ) { 207 $redirect_url = redirect_guess_404_permalink(); 208 209 if ( $redirect_url ) { 210 $redirect['query'] = _remove_qs_args_if_not_in_url( 211 $redirect['query'], 212 array( 'page', 'feed', 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), 213 $redirect_url 214 ); 215 } 216 } 217 } elseif ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) { 218 219 // Rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101. 220 if ( is_attachment() 221 && ! array_diff( array_keys( $wp->query_vars ), array( 'attachment', 'attachment_id' ) ) 222 && ! $redirect_url 223 ) { 224 if ( ! empty( $_GET['attachment_id'] ) ) { 225 $redirect_url = get_attachment_link( get_query_var( 'attachment_id' ) ); 226 227 if ( $redirect_url ) { 228 $redirect['query'] = remove_query_arg( 'attachment_id', $redirect['query'] ); 229 } 230 } else { 231 $redirect_url = get_attachment_link(); 232 } 233 } elseif ( is_single() && ! empty( $_GET['p'] ) && ! $redirect_url ) { 234 $redirect_url = get_permalink( get_query_var( 'p' ) ); 235 236 if ( $redirect_url ) { 237 $redirect['query'] = remove_query_arg( array( 'p', 'post_type' ), $redirect['query'] ); 238 } 239 } elseif ( is_single() && ! empty( $_GET['name'] ) && ! $redirect_url ) { 240 $redirect_url = get_permalink( $wp_query->get_queried_object_id() ); 241 242 if ( $redirect_url ) { 243 $redirect['query'] = remove_query_arg( 'name', $redirect['query'] ); 244 } 245 } elseif ( is_page() && ! empty( $_GET['page_id'] ) && ! $redirect_url ) { 246 $redirect_url = get_permalink( get_query_var( 'page_id' ) ); 247 248 if ( $redirect_url ) { 249 $redirect['query'] = remove_query_arg( 'page_id', $redirect['query'] ); 250 } 251 } elseif ( is_page() && ! is_feed() && ! $redirect_url 252 && 'page' === get_option( 'show_on_front' ) && get_queried_object_id() === (int) get_option( 'page_on_front' ) 253 ) { 254 $redirect_url = home_url( '/' ); 255 } elseif ( is_home() && ! empty( $_GET['page_id'] ) && ! $redirect_url 256 && 'page' === get_option( 'show_on_front' ) && get_query_var( 'page_id' ) === (int) get_option( 'page_for_posts' ) 257 ) { 258 $redirect_url = get_permalink( get_option( 'page_for_posts' ) ); 259 260 if ( $redirect_url ) { 261 $redirect['query'] = remove_query_arg( 'page_id', $redirect['query'] ); 262 } 263 } elseif ( ! empty( $_GET['m'] ) && ( is_year() || is_month() || is_day() ) ) { 264 $m = get_query_var( 'm' ); 265 266 switch ( strlen( $m ) ) { 267 case 4: // Yearly. 268 $redirect_url = get_year_link( $m ); 269 break; 270 case 6: // Monthly. 271 $redirect_url = get_month_link( substr( $m, 0, 4 ), substr( $m, 4, 2 ) ); 272 break; 273 case 8: // Daily. 274 $redirect_url = get_day_link( substr( $m, 0, 4 ), substr( $m, 4, 2 ), substr( $m, 6, 2 ) ); 275 break; 276 } 277 278 if ( $redirect_url ) { 279 $redirect['query'] = remove_query_arg( 'm', $redirect['query'] ); 280 } 281 // Now moving on to non ?m=X year/month/day links. 282 } elseif ( is_date() ) { 283 $year = get_query_var( 'year' ); 284 $month = get_query_var( 'monthnum' ); 285 $day = get_query_var( 'day' ); 286 287 if ( is_day() && $year && $month && ! empty( $_GET['day'] ) ) { 288 $redirect_url = get_day_link( $year, $month, $day ); 289 290 if ( $redirect_url ) { 291 $redirect['query'] = remove_query_arg( array( 'year', 'monthnum', 'day' ), $redirect['query'] ); 292 } 293 } elseif ( is_month() && $year && ! empty( $_GET['monthnum'] ) ) { 294 $redirect_url = get_month_link( $year, $month ); 295 296 if ( $redirect_url ) { 297 $redirect['query'] = remove_query_arg( array( 'year', 'monthnum' ), $redirect['query'] ); 298 } 299 } elseif ( is_year() && ! empty( $_GET['year'] ) ) { 300 $redirect_url = get_year_link( $year ); 301 302 if ( $redirect_url ) { 303 $redirect['query'] = remove_query_arg( 'year', $redirect['query'] ); 304 } 305 } 306 } elseif ( is_author() && ! empty( $_GET['author'] ) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) { 307 $author = get_userdata( get_query_var( 'author' ) ); 308 309 if ( false !== $author 310 && $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 ) ) 311 ) { 312 $redirect_url = get_author_posts_url( $author->ID, $author->user_nicename ); 313 314 if ( $redirect_url ) { 315 $redirect['query'] = remove_query_arg( 'author', $redirect['query'] ); 316 } 317 } 318 } elseif ( is_category() || is_tag() || is_tax() ) { // Terms (tags/categories). 319 $term_count = 0; 320 321 foreach ( $wp_query->tax_query->queried_terms as $tax_query ) { 322 $term_count += count( $tax_query['terms'] ); 323 } 324 325 $obj = $wp_query->get_queried_object(); 326 327 if ( $term_count <= 1 && ! empty( $obj->term_id ) ) { 328 $tax_url = get_term_link( (int) $obj->term_id, $obj->taxonomy ); 329 330 if ( $tax_url && ! is_wp_error( $tax_url ) ) { 331 if ( ! empty( $redirect['query'] ) ) { 332 // Strip taxonomy query vars off the URL. 333 $qv_remove = array( 'term', 'taxonomy' ); 334 335 if ( is_category() ) { 336 $qv_remove[] = 'category_name'; 337 $qv_remove[] = 'cat'; 338 } elseif ( is_tag() ) { 339 $qv_remove[] = 'tag'; 340 $qv_remove[] = 'tag_id'; 341 } else { 342 // Custom taxonomies will have a custom query var, remove those too. 343 $tax_obj = get_taxonomy( $obj->taxonomy ); 344 if ( false !== $tax_obj->query_var ) { 345 $qv_remove[] = $tax_obj->query_var; 346 } 347 } 348 349 $rewrite_vars = array_diff( array_keys( $wp_query->query ), array_keys( $_GET ) ); 350 351 // Check to see if all the query vars are coming from the rewrite, none are set via $_GET. 352 if ( ! array_diff( $rewrite_vars, array_keys( $_GET ) ) ) { 353 // Remove all of the per-tax query vars. 354 $redirect['query'] = remove_query_arg( $qv_remove, $redirect['query'] ); 355 356 // Create the destination URL for this taxonomy. 357 $tax_url = parse_url( $tax_url ); 358 359 if ( ! empty( $tax_url['query'] ) ) { 360 // Taxonomy accessible via ?taxonomy=...&term=... or any custom query var. 361 parse_str( $tax_url['query'], $query_vars ); 362 $redirect['query'] = add_query_arg( $query_vars, $redirect['query'] ); 363 } else { 364 // Taxonomy is accessible via a "pretty URL". 365 $redirect['path'] = $tax_url['path']; 366 } 367 } else { 368 // Some query vars are set via $_GET. Unset those from $_GET that exist via the rewrite. 369 foreach ( $qv_remove as $_qv ) { 370 if ( isset( $rewrite_vars[ $_qv ] ) ) { 371 $redirect['query'] = remove_query_arg( $_qv, $redirect['query'] ); 372 } 373 } 374 } 375 } 376 } 377 } 378 } elseif ( is_single() && strpos( $wp_rewrite->permalink_structure, '%category%' ) !== false ) { 379 $category_name = get_query_var( 'category_name' ); 380 381 if ( $category_name ) { 382 $category = get_category_by_path( $category_name ); 383 384 if ( ! $category || is_wp_error( $category ) 385 || ! has_term( $category->term_id, 'category', $wp_query->get_queried_object_id() ) 386 ) { 387 $redirect_url = get_permalink( $wp_query->get_queried_object_id() ); 388 } 389 } 390 } 391 392 // Post paging. 393 if ( is_singular() && get_query_var( 'page' ) ) { 394 $page = get_query_var( 'page' ); 395 396 if ( ! $redirect_url ) { 397 $redirect_url = get_permalink( get_queried_object_id() ); 398 } 399 400 if ( $page > 1 ) { 401 $redirect_url = trailingslashit( $redirect_url ); 402 403 if ( is_front_page() ) { 404 $redirect_url .= user_trailingslashit( "$wp_rewrite->pagination_base/$page", 'paged' ); 405 } else { 406 $redirect_url .= user_trailingslashit( $page, 'single_paged' ); 407 } 408 } 409 410 $redirect['query'] = remove_query_arg( 'page', $redirect['query'] ); 411 } 412 413 if ( get_query_var( 'sitemap' ) ) { 414 $redirect_url = get_sitemap_url( get_query_var( 'sitemap' ), get_query_var( 'sitemap-subtype' ), get_query_var( 'paged' ) ); 415 $redirect['query'] = remove_query_arg( array( 'sitemap', 'sitemap-subtype', 'paged' ), $redirect['query'] ); 416 } elseif ( get_query_var( 'paged' ) || is_feed() || get_query_var( 'cpage' ) ) { 417 // Paging and feeds. 418 $paged = get_query_var( 'paged' ); 419 $feed = get_query_var( 'feed' ); 420 $cpage = get_query_var( 'cpage' ); 421 422 while ( preg_match( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", $redirect['path'] ) 423 || preg_match( '#/(comments/?)?(feed|rss2?|rdf|atom)(/+)?$#', $redirect['path'] ) 424 || preg_match( "#/{$wp_rewrite->comments_pagination_base}-[0-9]+(/+)?$#", $redirect['path'] ) 425 ) { 426 // Strip off any existing paging. 427 $redirect['path'] = preg_replace( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", '/', $redirect['path'] ); 428 // Strip off feed endings. 429 $redirect['path'] = preg_replace( '#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path'] ); 430 // Strip off any existing comment paging. 431 $redirect['path'] = preg_replace( "#/{$wp_rewrite->comments_pagination_base}-[0-9]+?(/+)?$#", '/', $redirect['path'] ); 432 } 433 434 $addl_path = ''; 435 $default_feed = get_default_feed(); 436 437 if ( is_feed() && in_array( $feed, $wp_rewrite->feeds, true ) ) { 438 $addl_path = ! empty( $addl_path ) ? trailingslashit( $addl_path ) : ''; 439 440 if ( ! is_singular() && get_query_var( 'withcomments' ) ) { 441 $addl_path .= 'comments/'; 442 } 443 444 if ( ( 'rss' === $default_feed && 'feed' === $feed ) || 'rss' === $feed ) { 445 $format = ( 'rss2' === $default_feed ) ? '' : 'rss2'; 446 } else { 447 $format = ( $default_feed === $feed || 'feed' === $feed ) ? '' : $feed; 448 } 449 450 $addl_path .= user_trailingslashit( 'feed/' . $format, 'feed' ); 451 452 $redirect['query'] = remove_query_arg( 'feed', $redirect['query'] ); 453 } elseif ( is_feed() && 'old' === $feed ) { 454 $old_feed_files = array( 455 'wp-atom.php' => 'atom', 456 'wp-commentsrss2.php' => 'comments_rss2', 457 'wp-feed.php' => $default_feed, 458 'wp-rdf.php' => 'rdf', 459 'wp-rss.php' => 'rss2', 460 'wp-rss2.php' => 'rss2', 461 ); 462 463 if ( isset( $old_feed_files[ basename( $redirect['path'] ) ] ) ) { 464 $redirect_url = get_feed_link( $old_feed_files[ basename( $redirect['path'] ) ] ); 465 466 wp_redirect( $redirect_url, 301 ); 467 die(); 468 } 469 } 470 471 if ( $paged > 0 ) { 472 $redirect['query'] = remove_query_arg( 'paged', $redirect['query'] ); 473 474 if ( ! is_feed() ) { 475 if ( ! is_single() ) { 476 $addl_path = ! empty( $addl_path ) ? trailingslashit( $addl_path ) : ''; 477 478 if ( $paged > 1 ) { 479 $addl_path .= user_trailingslashit( "$wp_rewrite->pagination_base/$paged", 'paged' ); 480 } 481 } 482 } elseif ( $paged > 1 ) { 483 $redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] ); 484 } 485 } 486 487 $default_comments_page = get_option( 'default_comments_page' ); 488 489 if ( get_option( 'page_comments' ) 490 && ( 'newest' === $default_comments_page && $cpage > 0 491 || 'newest' !== $default_comments_page && $cpage > 1 ) 492 ) { 493 $addl_path = ( ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '' ); 494 $addl_path .= user_trailingslashit( $wp_rewrite->comments_pagination_base . '-' . $cpage, 'commentpaged' ); 495 496 $redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] ); 497 } 498 499 // Strip off trailing /index.php/. 500 $redirect['path'] = preg_replace( '|/' . preg_quote( $wp_rewrite->index, '|' ) . '/?$|', '/', $redirect['path'] ); 501 $redirect['path'] = user_trailingslashit( $redirect['path'] ); 502 503 if ( ! empty( $addl_path ) 504 && $wp_rewrite->using_index_permalinks() 505 && strpos( $redirect['path'], '/' . $wp_rewrite->index . '/' ) === false 506 ) { 507 $redirect['path'] = trailingslashit( $redirect['path'] ) . $wp_rewrite->index . '/'; 508 } 509 510 if ( ! empty( $addl_path ) ) { 511 $redirect['path'] = trailingslashit( $redirect['path'] ) . $addl_path; 512 } 513 514 $redirect_url = $redirect['scheme'] . '://' . $redirect['host'] . $redirect['path']; 515 } 516 517 if ( 'wp-register.php' === basename( $redirect['path'] ) ) { 518 if ( is_multisite() ) { 519 /** This filter is documented in wp-login.php */ 520 $redirect_url = apply_filters( 'wp_signup_location', network_site_url( 'wp-signup.php' ) ); 521 } else { 522 $redirect_url = wp_registration_url(); 523 } 524 525 wp_redirect( $redirect_url, 301 ); 526 die(); 527 } 528 } 529 530 $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] ); 531 532 // Tack on any additional query vars. 533 if ( $redirect_url && ! empty( $redirect['query'] ) ) { 534 parse_str( $redirect['query'], $_parsed_query ); 535 $redirect = parse_url( $redirect_url ); 536 537 if ( ! empty( $_parsed_query['name'] ) && ! empty( $redirect['query'] ) ) { 538 parse_str( $redirect['query'], $_parsed_redirect_query ); 539 540 if ( empty( $_parsed_redirect_query['name'] ) ) { 541 unset( $_parsed_query['name'] ); 542 } 543 } 544 545 $_parsed_query = array_combine( 546 rawurlencode_deep( array_keys( $_parsed_query ) ), 547 rawurlencode_deep( array_values( $_parsed_query ) ) 548 ); 549 550 $redirect_url = add_query_arg( $_parsed_query, $redirect_url ); 551 } 552 553 if ( $redirect_url ) { 554 $redirect = parse_url( $redirect_url ); 555 } 556 557 // www.example.com vs. example.com 558 $user_home = parse_url( home_url() ); 559 560 if ( ! empty( $user_home['host'] ) ) { 561 $redirect['host'] = $user_home['host']; 562 } 563 564 if ( empty( $user_home['path'] ) ) { 565 $user_home['path'] = '/'; 566 } 567 568 // Handle ports. 569 if ( ! empty( $user_home['port'] ) ) { 570 $redirect['port'] = $user_home['port']; 571 } else { 572 unset( $redirect['port'] ); 573 } 574 575 // Trailing /index.php. 576 $redirect['path'] = preg_replace( '|/' . preg_quote( $wp_rewrite->index, '|' ) . '/*?$|', '/', $redirect['path'] ); 577 578 $punctuation_pattern = implode( 579 '|', 580 array_map( 581 'preg_quote', 582 array( 583 ' ', 584 '%20', // Space. 585 '!', 586 '%21', // Exclamation mark. 587 '"', 588 '%22', // Double quote. 589 "'", 590 '%27', // Single quote. 591 '(', 592 '%28', // Opening bracket. 593 ')', 594 '%29', // Closing bracket. 595 ',', 596 '%2C', // Comma. 597 '.', 598 '%2E', // Period. 599 ';', 600 '%3B', // Semicolon. 601 '{', 602 '%7B', // Opening curly bracket. 603 '}', 604 '%7D', // Closing curly bracket. 605 '%E2%80%9C', // Opening curly quote. 606 '%E2%80%9D', // Closing curly quote. 607 ) 608 ) 609 ); 610 611 // Remove trailing spaces and end punctuation from the path. 612 $redirect['path'] = preg_replace( "#($punctuation_pattern)+$#", '', $redirect['path'] ); 613 614 if ( ! empty( $redirect['query'] ) ) { 615 // Remove trailing spaces and end punctuation from certain terminating query string args. 616 $redirect['query'] = preg_replace( "#((^|&)(p|page_id|cat|tag)=[^&]*?)($punctuation_pattern)+$#", '$1', $redirect['query'] ); 617 618 // Clean up empty query strings. 619 $redirect['query'] = trim( preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query'] ), '&' ); 620 621 // Redirect obsolete feeds. 622 $redirect['query'] = preg_replace( '#(^|&)feed=rss(&|$)#', '$1feed=rss2$2', $redirect['query'] ); 623 624 // Remove redundant leading ampersands. 625 $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] ); 626 } 627 628 // Strip /index.php/ when we're not using PATHINFO permalinks. 629 if ( ! $wp_rewrite->using_index_permalinks() ) { 630 $redirect['path'] = str_replace( '/' . $wp_rewrite->index . '/', '/', $redirect['path'] ); 631 } 632 633 // Trailing slashes. 634 if ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() 635 && ! is_404() && ( ! is_front_page() || is_front_page() && get_query_var( 'paged' ) > 1 ) 636 ) { 637 $user_ts_type = ''; 638 639 if ( get_query_var( 'paged' ) > 0 ) { 640 $user_ts_type = 'paged'; 641 } else { 642 foreach ( array( 'single', 'category', 'page', 'day', 'month', 'year', 'home' ) as $type ) { 643 $func = 'is_' . $type; 644 if ( call_user_func( $func ) ) { 645 $user_ts_type = $type; 646 break; 647 } 648 } 649 } 650 651 $redirect['path'] = user_trailingslashit( $redirect['path'], $user_ts_type ); 652 } elseif ( is_front_page() ) { 653 $redirect['path'] = trailingslashit( $redirect['path'] ); 654 } 655 656 // Remove trailing slash for robots.txt or sitemap requests. 657 if ( is_robots() 658 || ! empty( get_query_var( 'sitemap' ) ) || ! empty( get_query_var( 'sitemap-stylesheet' ) ) 659 ) { 660 $redirect['path'] = untrailingslashit( $redirect['path'] ); 661 } 662 663 // Strip multiple slashes out of the URL. 664 if ( strpos( $redirect['path'], '//' ) > -1 ) { 665 $redirect['path'] = preg_replace( '|/+|', '/', $redirect['path'] ); 666 } 667 668 // Always trailing slash the Front Page URL. 669 if ( trailingslashit( $redirect['path'] ) === trailingslashit( $user_home['path'] ) ) { 670 $redirect['path'] = trailingslashit( $redirect['path'] ); 671 } 672 673 $original_host_low = strtolower( $original['host'] ); 674 $redirect_host_low = strtolower( $redirect['host'] ); 675 676 // Ignore differences in host capitalization, as this can lead to infinite redirects. 677 // Only redirect no-www <=> yes-www. 678 if ( $original_host_low === $redirect_host_low 679 || ( 'www.' . $original_host_low !== $redirect_host_low 680 && 'www.' . $redirect_host_low !== $original_host_low ) 681 ) { 682 $redirect['host'] = $original['host']; 683 } 684 685 $compare_original = array( $original['host'], $original['path'] ); 686 687 if ( ! empty( $original['port'] ) ) { 688 $compare_original[] = $original['port']; 689 } 690 691 if ( ! empty( $original['query'] ) ) { 692 $compare_original[] = $original['query']; 693 } 694 695 $compare_redirect = array( $redirect['host'], $redirect['path'] ); 696 697 if ( ! empty( $redirect['port'] ) ) { 698 $compare_redirect[] = $redirect['port']; 699 } 700 701 if ( ! empty( $redirect['query'] ) ) { 702 $compare_redirect[] = $redirect['query']; 703 } 704 705 if ( $compare_original !== $compare_redirect ) { 706 $redirect_url = $redirect['scheme'] . '://' . $redirect['host']; 707 708 if ( ! empty( $redirect['port'] ) ) { 709 $redirect_url .= ':' . $redirect['port']; 710 } 711 712 $redirect_url .= $redirect['path']; 713 714 if ( ! empty( $redirect['query'] ) ) { 715 $redirect_url .= '?' . $redirect['query']; 716 } 717 } 718 719 if ( ! $redirect_url || $redirect_url === $requested_url ) { 720 return; 721 } 722 723 // Hex encoded octets are case-insensitive. 724 if ( false !== strpos( $requested_url, '%' ) ) { 725 if ( ! function_exists( 'lowercase_octets' ) ) { 726 /** 727 * Converts the first hex-encoded octet match to lowercase. 728 * 729 * @since 3.1.0 730 * @ignore 731 * 732 * @param array $matches Hex-encoded octet matches for the requested URL. 733 * @return string Lowercased version of the first match. 734 */ 735 function lowercase_octets( $matches ) { 736 return strtolower( $matches[0] ); 737 } 738 } 739 740 $requested_url = preg_replace_callback( '|%[a-fA-F0-9][a-fA-F0-9]|', 'lowercase_octets', $requested_url ); 741 } 742 743 /** 744 * Filters the canonical redirect URL. 745 * 746 * Returning false to this filter will cancel the redirect. 747 * 748 * @since 2.3.0 749 * 750 * @param string $redirect_url The redirect URL. 751 * @param string $requested_url The requested URL. 752 */ 753 $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url ); 754 755 // Yes, again -- in case the filter aborted the request. 756 if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) === strip_fragment_from_url( $requested_url ) ) { 757 return; 758 } 759 760 if ( $do_redirect ) { 761 // Protect against chained redirects. 762 if ( ! redirect_canonical( $redirect_url, false ) ) { 763 wp_redirect( $redirect_url, 301 ); 764 exit; 765 } else { 766 // Debug. 767 // die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) ); 768 return; 769 } 770 } else { 771 return $redirect_url; 772 } 773 } 774 775 /** 776 * Removes arguments from a query string if they are not present in a URL 777 * DO NOT use this in plugin code. 778 * 779 * @since 3.4.0 780 * @access private 781 * 782 * @param string $query_string 783 * @param array $args_to_check 784 * @param string $url 785 * @return string The altered query string 786 */ 787 function _remove_qs_args_if_not_in_url( $query_string, array $args_to_check, $url ) { 788 $parsed_url = parse_url( $url ); 789 790 if ( ! empty( $parsed_url['query'] ) ) { 791 parse_str( $parsed_url['query'], $parsed_query ); 792 793 foreach ( $args_to_check as $qv ) { 794 if ( ! isset( $parsed_query[ $qv ] ) ) { 795 $query_string = remove_query_arg( $qv, $query_string ); 796 } 797 } 798 } else { 799 $query_string = remove_query_arg( $args_to_check, $query_string ); 800 } 801 802 return $query_string; 803 } 804 805 /** 806 * Strips the #fragment from a URL, if one is present. 807 * 808 * @since 4.4.0 809 * 810 * @param string $url The URL to strip. 811 * @return string The altered URL. 812 */ 813 function strip_fragment_from_url( $url ) { 814 $parsed_url = parse_url( $url ); 815 816 if ( ! empty( $parsed_url['host'] ) ) { 817 // This mirrors code in redirect_canonical(). It does not handle every case. 818 $url = $parsed_url['scheme'] . '://' . $parsed_url['host']; 819 if ( ! empty( $parsed_url['port'] ) ) { 820 $url .= ':' . $parsed_url['port']; 821 } 822 823 if ( ! empty( $parsed_url['path'] ) ) { 824 $url .= $parsed_url['path']; 825 } 826 827 if ( ! empty( $parsed_url['query'] ) ) { 828 $url .= '?' . $parsed_url['query']; 829 } 830 } 831 832 return $url; 833 } 834 835 /** 836 * Attempts to guess the correct URL for a 404 request based on query vars. 837 * 838 * @since 2.3.0 839 * 840 * @global wpdb $wpdb WordPress database abstraction object. 841 * 842 * @return string|false The correct URL if one is found. False on failure. 843 */ 844 function redirect_guess_404_permalink() { 845 global $wpdb; 846 847 /** 848 * Filters whether to attempt to guess a redirect URL for a 404 request. 849 * 850 * Returning a false value from the filter will disable the URL guessing 851 * and return early without performing a redirect. 852 * 853 * @since 5.5.0 854 * 855 * @param bool $do_redirect_guess Whether to attempt to guess a redirect URL 856 * for a 404 request. Default true. 857 */ 858 if ( false === apply_filters( 'do_redirect_guess_404_permalink', true ) ) { 859 return false; 860 } 861 862 /** 863 * Short-circuits the redirect URL guessing for 404 requests. 864 * 865 * Returning a non-null value from the filter will effectively short-circuit 866 * the URL guessing, returning the passed value instead. 867 * 868 * @since 5.5.0 869 * 870 * @param null|string|false $pre Whether to short-circuit guessing the redirect for a 404. 871 * Default null to continue with the URL guessing. 872 */ 873 $pre = apply_filters( 'pre_redirect_guess_404_permalink', null ); 874 if ( null !== $pre ) { 875 return $pre; 876 } 877 878 if ( get_query_var( 'name' ) ) { 879 /** 880 * Filters whether to perform a strict guess for a 404 redirect. 881 * 882 * Returning a truthy value from the filter will redirect only exact post_name matches. 883 * 884 * @since 5.5.0 885 * 886 * @param bool $strict_guess Whether to perform a strict guess. Default false (loose guess). 887 */ 888 $strict_guess = apply_filters( 'strict_redirect_guess_404_permalink', false ); 889 890 if ( $strict_guess ) { 891 $where = $wpdb->prepare( 'post_name = %s', get_query_var( 'name' ) ); 892 } else { 893 $where = $wpdb->prepare( 'post_name LIKE %s', $wpdb->esc_like( get_query_var( 'name' ) ) . '%' ); 894 } 895 896 // If any of post_type, year, monthnum, or day are set, use them to refine the query. 897 if ( get_query_var( 'post_type' ) ) { 898 $where .= $wpdb->prepare( ' AND post_type = %s', get_query_var( 'post_type' ) ); 899 } else { 900 $where .= " AND post_type IN ('" . implode( "', '", get_post_types( array( 'public' => true ) ) ) . "')"; 901 } 902 903 if ( get_query_var( 'year' ) ) { 904 $where .= $wpdb->prepare( ' AND YEAR(post_date) = %d', get_query_var( 'year' ) ); 905 } 906 if ( get_query_var( 'monthnum' ) ) { 907 $where .= $wpdb->prepare( ' AND MONTH(post_date) = %d', get_query_var( 'monthnum' ) ); 908 } 909 if ( get_query_var( 'day' ) ) { 910 $where .= $wpdb->prepare( ' AND DAYOFMONTH(post_date) = %d', get_query_var( 'day' ) ); 911 } 912 913 // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared 914 $post_id = $wpdb->get_var( "SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'" ); 915 916 if ( ! $post_id ) { 917 return false; 918 } 919 920 if ( get_query_var( 'feed' ) ) { 921 return get_post_comments_feed_link( $post_id, get_query_var( 'feed' ) ); 922 } elseif ( get_query_var( 'page' ) > 1 ) { 923 return trailingslashit( get_permalink( $post_id ) ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' ); 924 } else { 925 return get_permalink( $post_id ); 926 } 927 } 928 929 return false; 930 } 931 932 /** 933 * Redirects a variety of shorthand URLs to the admin. 934 * 935 * If a user visits example.com/admin, they'll be redirected to /wp-admin. 936 * Visiting /login redirects to /wp-login.php, and so on. 937 * 938 * @since 3.4.0 939 * 940 * @global WP_Rewrite $wp_rewrite WordPress rewrite component. 941 */ 942 function wp_redirect_admin_locations() { 943 global $wp_rewrite; 944 945 if ( ! ( is_404() && $wp_rewrite->using_permalinks() ) ) { 946 return; 947 } 948 949 $admins = array( 950 home_url( 'wp-admin', 'relative' ), 951 home_url( 'dashboard', 'relative' ), 952 home_url( 'admin', 'relative' ), 953 site_url( 'dashboard', 'relative' ), 954 site_url( 'admin', 'relative' ), 955 ); 956 957 if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $admins, true ) ) { 958 wp_redirect( admin_url() ); 959 exit; 960 } 961 962 $logins = array( 963 home_url( 'wp-login.php', 'relative' ), 964 home_url( 'login', 'relative' ), 965 site_url( 'login', 'relative' ), 966 ); 967 968 if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $logins, true ) ) { 969 wp_redirect( wp_login_url() ); 970 exit; 971 } 972 }
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| Generated: Fri Sep 25 01:00:03 2020 | Cross-referenced by PHPXref 0.7.1 |