Projects : mp-wp : mp-wp_genesis
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 | * @author Scott Yang |
9 | * @author Mark Jaquith |
10 | * @package WordPress |
11 | * @since 2.3.0 |
12 | */ |
13 | |
14 | /** |
15 | * Redirects incoming links to the proper URL based on the site url. |
16 | * |
17 | * Search engines consider www.somedomain.com and somedomain.com to be two |
18 | * different URLs when they both go to the same location. This SEO enhancement |
19 | * prevents penality for duplicate content by redirecting all incoming links to |
20 | * one or the other. |
21 | * |
22 | * Prevents redirection for feeds, trackbacks, searches, comment popup, and |
23 | * admin URLs. Does not redirect on IIS, page/post previews, and on form data. |
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 | * @uses $wp_rewrite |
31 | * @uses $is_IIS |
32 | * |
33 | * @param string $requested_url Optional. The URL that was requested, used to |
34 | * figure if redirect is needed. |
35 | * @param bool $do_redirect Optional. Redirect to the new URL. |
36 | * @return null|false|string Null, if redirect not needed. False, if redirect |
37 | * not needed or the string of the URL |
38 | */ |
39 | function redirect_canonical($requested_url=null, $do_redirect=true) { |
40 | global $wp_rewrite, $is_IIS, $wp_query, $wpdb; |
41 | |
42 | if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() || is_robots() ) |
43 | return; |
44 | |
45 | if ( !$requested_url ) { |
46 | // build the URL in the address bar |
47 | $requested_url = ( !empty($_SERVER['HTTPS'] ) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://'; |
48 | $requested_url .= $_SERVER['HTTP_HOST']; |
49 | $requested_url .= $_SERVER['REQUEST_URI']; |
50 | } |
51 | |
52 | $original = @parse_url($requested_url); |
53 | if ( false === $original ) |
54 | return; |
55 | |
56 | // Some PHP setups turn requests for / into /index.php in REQUEST_URI |
57 | // See: http://trac.wordpress.org/ticket/5017 |
58 | // See: http://trac.wordpress.org/ticket/7173 |
59 | // Disabled, for now: |
60 | // $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']); |
61 | |
62 | $redirect = $original; |
63 | $redirect_url = false; |
64 | |
65 | // Notice fixing |
66 | if ( !isset($redirect['path']) ) $redirect['path'] = ''; |
67 | if ( !isset($redirect['query']) ) $redirect['query'] = ''; |
68 | |
69 | if ( is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) { |
70 | |
71 | $vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) ); |
72 | |
73 | if ( isset($vars[0]) && $vars = $vars[0] ) { |
74 | if ( 'revision' == $vars->post_type && $vars->post_parent > 0 ) |
75 | $id = $vars->post_parent; |
76 | |
77 | if ( $redirect_url = get_permalink($id) ) |
78 | $redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id'), $redirect['query']); |
79 | } |
80 | } |
81 | |
82 | // These tests give us a WP-generated permalink |
83 | if ( is_404() ) { |
84 | $redirect_url = redirect_guess_404_permalink(); |
85 | } elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) { |
86 | // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101 |
87 | if ( is_single() && !empty($_GET['p']) && ! $redirect_url ) { |
88 | if ( $redirect_url = get_permalink(get_query_var('p')) ) |
89 | $redirect['query'] = remove_query_arg('p', $redirect['query']); |
90 | if ( get_query_var( 'page' ) ) { |
91 | $redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' ); |
92 | $redirect['query'] = remove_query_arg( 'page', $redirect['query'] ); |
93 | } |
94 | } elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) { |
95 | if ( $redirect_url = get_permalink(get_query_var('page_id')) ) |
96 | $redirect['query'] = remove_query_arg('page_id', $redirect['query']); |
97 | } elseif ( !empty($_GET['m']) && ( is_year() || is_month() || is_day() ) ) { |
98 | $m = get_query_var('m'); |
99 | switch ( strlen($m) ) { |
100 | case 4: // Yearly |
101 | $redirect_url = get_year_link($m); |
102 | break; |
103 | case 6: // Monthly |
104 | $redirect_url = get_month_link( substr($m, 0, 4), substr($m, 4, 2) ); |
105 | break; |
106 | case 8: // Daily |
107 | $redirect_url = get_day_link(substr($m, 0, 4), substr($m, 4, 2), substr($m, 6, 2)); |
108 | break; |
109 | } |
110 | if ( $redirect_url ) |
111 | $redirect['query'] = remove_query_arg('m', $redirect['query']); |
112 | // now moving on to non ?m=X year/month/day links |
113 | } elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_GET['day']) ) { |
114 | if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) ) |
115 | $redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']); |
116 | } elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) { |
117 | if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) ) |
118 | $redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']); |
119 | } elseif ( is_year() && !empty($_GET['year']) ) { |
120 | if ( $redirect_url = get_year_link(get_query_var('year')) ) |
121 | $redirect['query'] = remove_query_arg('year', $redirect['query']); |
122 | } elseif ( is_category() && !empty($_GET['cat']) ) { |
123 | if ( $redirect_url = get_category_link(get_query_var('cat')) ) |
124 | $redirect['query'] = remove_query_arg('cat', $redirect['query']); |
125 | } elseif ( is_author() && !empty($_GET['author']) ) { |
126 | $author = get_userdata(get_query_var('author')); |
127 | if ( false !== $author && $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) ) |
128 | $redirect['query'] = remove_query_arg('author', $redirect['author']); |
129 | } |
130 | |
131 | // paging and feeds |
132 | if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) { |
133 | if ( !$redirect_url ) |
134 | $redirect_url = $requested_url; |
135 | $paged_redirect = @parse_url($redirect_url); |
136 | while ( preg_match( '#/page/[0-9]+?(/+)?$#', $paged_redirect['path'] ) || preg_match( '#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $paged_redirect['path'] ) || preg_match( '#/comment-page-[0-9]+(/+)?$#', $paged_redirect['path'] ) ) { |
137 | // Strip off paging and feed |
138 | $paged_redirect['path'] = preg_replace('#/page/[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing paging |
139 | $paged_redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+)?$#', '/', $paged_redirect['path']); // strip off feed endings |
140 | $paged_redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing comment paging |
141 | } |
142 | |
143 | $addl_path = ''; |
144 | if ( is_feed() ) { |
145 | $addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : ''; |
146 | if ( get_query_var( 'withcomments' ) ) |
147 | $addl_path .= 'comments/'; |
148 | $addl_path .= user_trailingslashit( 'feed/' . ( ( 'rss2' == get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' ); |
149 | $redirect['query'] = remove_query_arg( 'feed', $redirect['query'] ); |
150 | } |
151 | |
152 | if ( get_query_var('paged') > 0 ) { |
153 | $paged = get_query_var('paged'); |
154 | $redirect['query'] = remove_query_arg( 'paged', $redirect['query'] ); |
155 | if ( !is_feed() ) { |
156 | if ( $paged > 1 && !is_single() ) { |
157 | $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("page/$paged", 'paged'); |
158 | } elseif ( !is_single() ) { |
159 | $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit($paged_redirect['path'], 'paged'); |
160 | } |
161 | } elseif ( $paged > 1 ) { |
162 | $redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] ); |
163 | } |
164 | } |
165 | |
166 | if ( get_option('page_comments') && ( ( 'newest' == get_option('default_comments_page') && get_query_var('cpage') > 0 ) || ( 'newest' != get_option('default_comments_page') && get_query_var('cpage') > 1 ) ) ) { |
167 | $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit( 'comment-page-' . get_query_var('cpage'), 'commentpaged' ); |
168 | $redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] ); |
169 | } |
170 | |
171 | $paged_redirect['path'] = user_trailingslashit( preg_replace('|/index.php/?$|', '/', $paged_redirect['path']) ); // strip off trailing /index.php/ |
172 | if ( !empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false ) |
173 | $paged_redirect['path'] = trailingslashit($paged_redirect['path']) . 'index.php/'; |
174 | if ( !empty( $addl_path ) ) |
175 | $paged_redirect['path'] = trailingslashit($paged_redirect['path']) . $addl_path; |
176 | $redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path']; |
177 | $redirect['path'] = $paged_redirect['path']; |
178 | } |
179 | } |
180 | |
181 | // tack on any additional query vars |
182 | $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] ); |
183 | if ( $redirect_url && !empty($redirect['query']) ) { |
184 | if ( strpos($redirect_url, '?') !== false ) |
185 | $redirect_url .= '&'; |
186 | else |
187 | $redirect_url .= '?'; |
188 | $redirect_url .= $redirect['query']; |
189 | } |
190 | |
191 | if ( $redirect_url ) |
192 | $redirect = @parse_url($redirect_url); |
193 | |
194 | // www.example.com vs example.com |
195 | $user_home = @parse_url(get_option('home')); |
196 | if ( !empty($user_home['host']) ) |
197 | $redirect['host'] = $user_home['host']; |
198 | if ( empty($user_home['path']) ) |
199 | $user_home['path'] = '/'; |
200 | |
201 | // Handle ports |
202 | if ( !empty($user_home['port']) ) |
203 | $redirect['port'] = $user_home['port']; |
204 | else |
205 | unset($redirect['port']); |
206 | |
207 | // trailing /index.php |
208 | $redirect['path'] = preg_replace('|/index.php/*?$|', '/', $redirect['path']); |
209 | |
210 | // Remove trailing spaces from the path |
211 | $redirect['path'] = preg_replace( '#(%20| )+$#', '', $redirect['path'] ); |
212 | |
213 | if ( !empty( $redirect['query'] ) ) { |
214 | // Remove trailing spaces from certain terminating query string args |
215 | $redirect['query'] = preg_replace( '#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$1', $redirect['query'] ); |
216 | |
217 | // Clean up empty query strings |
218 | $redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query']), '&'); |
219 | |
220 | // Remove redundant leading ampersands |
221 | $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] ); |
222 | } |
223 | |
224 | // strip /index.php/ when we're not using PATHINFO permalinks |
225 | if ( !$wp_rewrite->using_index_permalinks() ) |
226 | $redirect['path'] = str_replace('/index.php/', '/', $redirect['path']); |
227 | |
228 | // trailing slashes |
229 | if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_front_page() || ( is_front_page() && (get_query_var('paged') > 1) ) ) ) { |
230 | $user_ts_type = ''; |
231 | if ( get_query_var('paged') > 0 ) { |
232 | $user_ts_type = 'paged'; |
233 | } else { |
234 | foreach ( array('single', 'category', 'page', 'day', 'month', 'year', 'home') as $type ) { |
235 | $func = 'is_' . $type; |
236 | if ( call_user_func($func) ) { |
237 | $user_ts_type = $type; |
238 | break; |
239 | } |
240 | } |
241 | } |
242 | $redirect['path'] = user_trailingslashit($redirect['path'], $user_ts_type); |
243 | } elseif ( is_front_page() ) { |
244 | $redirect['path'] = trailingslashit($redirect['path']); |
245 | } |
246 | |
247 | // Always trailing slash the Front Page URL |
248 | if ( trailingslashit( $redirect['path'] ) == trailingslashit( $user_home['path'] ) ) |
249 | $redirect['path'] = trailingslashit($redirect['path']); |
250 | |
251 | // Ignore differences in host capitalization, as this can lead to infinite redirects |
252 | // Only redirect no-www <=> yes-www |
253 | if ( strtolower($original['host']) == strtolower($redirect['host']) || |
254 | ( strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host']) ) ) |
255 | $redirect['host'] = $original['host']; |
256 | |
257 | $compare_original = array($original['host'], $original['path']); |
258 | |
259 | if ( !empty( $original['port'] ) ) |
260 | $compare_original[] = $original['port']; |
261 | |
262 | if ( !empty( $original['query'] ) ) |
263 | $compare_original[] = $original['query']; |
264 | |
265 | $compare_redirect = array($redirect['host'], $redirect['path']); |
266 | |
267 | if ( !empty( $redirect['port'] ) ) |
268 | $compare_redirect[] = $redirect['port']; |
269 | |
270 | if ( !empty( $redirect['query'] ) ) |
271 | $compare_redirect[] = $redirect['query']; |
272 | |
273 | if ( $compare_original !== $compare_redirect ) { |
274 | $redirect_url = $redirect['scheme'] . '://' . $redirect['host']; |
275 | if ( !empty($redirect['port']) ) |
276 | $redirect_url .= ':' . $redirect['port']; |
277 | $redirect_url .= $redirect['path']; |
278 | if ( !empty($redirect['query']) ) |
279 | $redirect_url .= '?' . $redirect['query']; |
280 | } |
281 | |
282 | if ( !$redirect_url || $redirect_url == $requested_url ) |
283 | return false; |
284 | |
285 | // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE |
286 | $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); |
287 | |
288 | if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request |
289 | return false; |
290 | |
291 | if ( $do_redirect ) { |
292 | // protect against chained redirects |
293 | if ( !redirect_canonical($redirect_url, false) ) { |
294 | wp_redirect($redirect_url, 301); |
295 | exit(); |
296 | } else { |
297 | // Debug |
298 | // die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) ); |
299 | return false; |
300 | } |
301 | } else { |
302 | return $redirect_url; |
303 | } |
304 | } |
305 | |
306 | /** |
307 | * Attempts to guess correct post based on query vars. |
308 | * |
309 | * @since 2.3.0 |
310 | * @uses $wpdb |
311 | * |
312 | * @return bool|string Returns False, if it can't find post, returns correct |
313 | * location on success. |
314 | */ |
315 | function redirect_guess_404_permalink() { |
316 | global $wpdb; |
317 | |
318 | if ( !get_query_var('name') ) |
319 | return false; |
320 | |
321 | $where = $wpdb->prepare("post_name LIKE %s", get_query_var('name') . '%'); |
322 | |
323 | // if any of year, monthnum, or day are set, use them to refine the query |
324 | if ( get_query_var('year') ) |
325 | $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year')); |
326 | if ( get_query_var('monthnum') ) |
327 | $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum')); |
328 | if ( get_query_var('day') ) |
329 | $where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day')); |
330 | |
331 | $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'"); |
332 | if ( !$post_id ) |
333 | return false; |
334 | return get_permalink($post_id); |
335 | } |
336 | |
337 | add_action('template_redirect', 'redirect_canonical'); |
338 | |
339 | ?> |