1 | <?php |
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2 | // Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference" by Mark Jaquith |
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3 | |
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4 | function redirect_canonical($requested_url=NULL, $do_redirect=true) { |
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5 | global $wp_rewrite, $posts, $is_IIS; |
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6 | |
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7 | if ( is_feed() || is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) ) |
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8 | return; |
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9 | |
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10 | if ( !$requested_url ) { |
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11 | // build the URL in the address bar |
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12 | $requested_url = ( isset($_SERVER['HTTPS'] ) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://'; |
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13 | $requested_url .= $_SERVER['HTTP_HOST']; |
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14 | $requested_url .= $_SERVER['REQUEST_URI']; |
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15 | } |
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16 | |
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17 | $original = @parse_url($requested_url); |
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18 | if ( false === $original ) |
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19 | return; |
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20 | |
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21 | $redirect = $original; |
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22 | $redirect_url = false; |
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23 | |
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24 | // These tests give us a WP-generated permalink |
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25 | if ( is_404() ) { |
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26 | $redirect_url = redirect_guess_404_permalink(); |
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27 | } elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) { |
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28 | // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101 |
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29 | if ( is_single() && isset($_GET['p']) ) { |
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30 | if ( $redirect_url = get_permalink(get_query_var('p')) ) |
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31 | $redirect['query'] = remove_query_arg('p', $redirect['query']); |
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32 | } elseif ( is_page() && isset($_GET['page_id']) ) { |
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33 | if ( $redirect_url = get_permalink(get_query_var('page_id')) ) |
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34 | $redirect['query'] = remove_query_arg('page_id', $redirect['query']); |
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35 | } elseif ( isset($_GET['m']) && ( is_year() || is_month() || is_day() ) ) { |
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36 | $m = get_query_var('m'); |
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37 | switch ( strlen($m) ) { |
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38 | case 4: // Yearly |
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39 | $redirect_url = get_year_link($m); |
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40 | break; |
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41 | case 6: // Monthly |
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42 | $redirect_url = get_month_link( substr($m, 0, 4), substr($m, 4, 2) ); |
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43 | break; |
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44 | case 8: // Daily |
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45 | $redirect_url = get_day_link(substr($m, 0, 4), substr($m, 4, 2), substr($m, 6, 2)); |
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46 | break; |
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47 | } |
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48 | if ( $redirect_url ) |
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49 | $redirect['query'] = remove_query_arg('m', $redirect['query']); |
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50 | // now moving on to non ?m=X year/month/day links |
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51 | } elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && isset($_GET['day']) ) { |
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52 | if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) ) |
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53 | $redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']); |
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54 | } elseif ( is_month() && get_query_var('year') && isset($_GET['monthnum']) ) { |
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55 | if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) ) |
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56 | $redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']); |
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57 | } elseif ( is_year() && isset($_GET['year']) ) { |
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58 | if ( $redirect_url = get_year_link(get_query_var('year')) ) |
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59 | $redirect['query'] = remove_query_arg('year', $redirect['query']); |
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60 | } elseif ( is_category() && isset($_GET['cat']) ) { |
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61 | if ( $redirect_url = get_category_link(get_query_var('cat')) ) |
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62 | $redirect['query'] = remove_query_arg('cat', $redirect['query']); |
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63 | } elseif ( is_author() && isset($_GET['author']) ) { |
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64 | $author = get_userdata(get_query_var('author')); |
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65 | if ( false !== $author && $redirect_url = get_author_link(false, $author->ID, $author->user_nicename) ) |
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66 | $redirect['query'] = remove_query_arg('author', $redirect['author']); |
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67 | } |
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68 | |
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69 | // paging |
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70 | if ( $paged = get_query_var('paged') ) { |
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71 | if ( $paged > 0 ) { |
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72 | if ( !$redirect_url ) |
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73 | $redirect_url = $requested_url; |
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74 | $paged_redirect = @parse_url($redirect_url); |
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75 | $paged_redirect['path'] = preg_replace('|/page/[0-9]+?(/+)?$|', '/', $paged_redirect['path']); // strip off any existing paging |
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76 | $paged_redirect['path'] = preg_replace('|/index.php/?$|', '/', $paged_redirect['path']); // strip off trailing /index.php/ |
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77 | if ( $paged > 1 && !is_single() ) { |
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78 | $paged_redirect['path'] = trailingslashit($paged_redirect['path']); |
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79 | if ( $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false ) |
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80 | $paged_redirect['path'] .= 'index.php/'; |
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81 | $paged_redirect['path'] .= user_trailingslashit("page/$paged", 'paged'); |
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82 | } elseif ( !is_home() && !is_single() ){ |
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83 | $paged_redirect['path'] = user_trailingslashit($paged_redirect['path'], 'paged'); |
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84 | } |
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85 | $redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path']; |
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86 | $redirect['path'] = $paged_redirect['path']; |
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87 | } |
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88 | $redirect['query'] = remove_query_arg('paged', $redirect['query']); |
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89 | } |
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90 | } |
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91 | |
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92 | // tack on any additional query vars |
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93 | if ( $redirect_url && $redirect['query'] ) { |
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94 | if ( strpos($redirect_url, '?') !== false ) |
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95 | $redirect_url .= '&'; |
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96 | else |
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97 | $redirect_url .= '?'; |
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98 | $redirect_url .= $redirect['query']; |
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99 | } |
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100 | |
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101 | if ( $redirect_url ) |
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102 | $redirect = @parse_url($redirect_url); |
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103 | |
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104 | // www.example.com vs example.com |
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105 | $user_home = @parse_url(get_option('home')); |
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106 | $redirect['host'] = $user_home['host']; |
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107 | |
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108 | // Handle ports |
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109 | if ( isset($user_home['port']) ) |
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110 | $redirect['port'] = $user_home['port']; |
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111 | else |
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112 | unset($redirect['port']); |
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113 | |
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114 | // trailing /index.php or /index.php/ |
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115 | $redirect['path'] = preg_replace('|/index.php/?$|', '/', $redirect['path']); |
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116 | |
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117 | // strip /index.php/ when we're not using PATHINFO permalinks |
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118 | if ( !$wp_rewrite->using_index_permalinks() ) |
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119 | $redirect['path'] = str_replace('/index.php/', '/', $redirect['path']); |
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120 | |
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121 | // trailing slashes |
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122 | if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_home() || ( is_home() && (get_query_var('paged') > 1) ) ) ) { |
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123 | $user_ts_type = ''; |
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124 | if ( get_query_var('paged') > 0 ) { |
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125 | $user_ts_type = 'paged'; |
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126 | } else { |
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127 | foreach ( array('single', 'category', 'page', 'day', 'month', 'year') as $type ) { |
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128 | $func = 'is_' . $type; |
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129 | if ( call_user_func($func) ) |
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130 | $user_ts_type = $type; |
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131 | break; |
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132 | } |
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133 | } |
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134 | $redirect['path'] = user_trailingslashit($redirect['path'], $user_ts_type); |
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135 | } elseif ( is_home() ) { |
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136 | $redirect['path'] = trailingslashit($redirect['path']); |
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137 | } |
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138 | |
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139 | // Always trailing slash the 'home' URL |
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140 | if ( $redirect['path'] == $user_home['path'] ) |
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141 | $redirect['path'] = trailingslashit($redirect['path']); |
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142 | |
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143 | // Ignore differences in host capitalization, as this can lead to infinite redirects |
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144 | if ( strtolower($original['host']) == strtolower($redirect['host']) ) |
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145 | $redirect['host'] = $original['host']; |
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146 | |
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147 | if ( array($original['host'], $original['port'], $original['path'], $original['query']) !== array($redirect['host'], $redirect['port'], $redirect['path'], $redirect['query']) ) { |
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148 | $redirect_url = $redirect['scheme'] . '://' . $redirect['host']; |
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149 | if ( isset($redirect['port']) ) |
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150 | $redirect_url .= ':' . $redirect['port']; |
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151 | $redirect_url .= $redirect['path']; |
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152 | if ( $redirect['query'] ) |
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153 | $redirect_url .= '?' . $redirect['query']; |
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154 | } |
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155 | |
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156 | if ( $redirect_url && $redirect_url != $requested_url ) { |
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157 | // var_dump($redirect_url); die(); |
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158 | $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); |
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159 | if ( $do_redirect) { |
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160 | // protect against chained redirects |
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161 | if ( !redirect_canonical($redirect_url, false) ) { |
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162 | wp_redirect($redirect_url, 301); |
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163 | exit(); |
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164 | } else { |
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165 | return false; |
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166 | } |
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167 | } else { |
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168 | return $redirect_url; |
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169 | } |
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170 | } else { |
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171 | return false; |
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172 | } |
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173 | } |
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174 | |
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175 | function redirect_guess_404_permalink() { |
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176 | global $wp_query, $wpdb; |
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177 | if ( !get_query_var('name') ) |
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178 | return false; |
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179 | |
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180 | $where = "post_name LIKE '" . $wpdb->escape(get_query_var('name')) . "%'"; |
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181 | |
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182 | // if any of year, monthnum, or day are set, use them to refine the query |
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183 | if ( get_query_var('year') ) |
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184 | $where .= " AND YEAR(post_date) = '" . $wpdb->escape(get_query_var('year')) . "'"; |
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185 | if ( get_query_var('monthnum') ) |
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186 | $where .= " AND MONTH(post_date) = '" . $wpdb->escape(get_query_var('monthnum')) . "'"; |
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187 | if ( get_query_var('day') ) |
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188 | $where .= " AND DAYOFMONTH(post_date) = '" . $wpdb->escape(get_query_var('day')) . "'"; |
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189 | |
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190 | $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'"); |
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191 | if ( !$post_id ) |
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192 | return false; |
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193 | return get_permalink($post_id); |
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194 | } |
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195 | |
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196 | add_action('template_redirect', 'redirect_canonical'); |
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197 | |
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198 | ?> |
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