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ylsy_permalink_redirect.php

2020年6月13日

<?php
/*
* Plugin Name: Permalink Redirect
* Plugin URI: http://scott.yang.id.au/code/permalink-redirect/
* Description: Permalink Redirect ensures that pages and entries are always accessed via the permalink. Otherwise, a 301 redirect will be issued.
* Version: 2.0.5
* Author: Scott Yang
* Author URI: http://scott.yang.id.au/
*/
class YLSY_PermalinkRedirect {
function admin_menu() {
add_options_page('Permalink Redirect Manager', 'Permalink Redirect', 5,
'permalink-redirect', array($this, 'admin_page'));
}

function admin_page() {
global $wp_version;

// If we are updating, we will flush all the rewrite rules to force the
// old structure to be added.
if (isset($_GET['updated']) ||
isset($_GET['settings-updated'])) {
$this->regenerate_rules();
}

$options = array('feedburner', 'feedburnerbrand', 'hostname',
'oldstruct', 'skip', 'newpath');
$optionvars = array();
foreach ($options as $option) {
$$option = get_option("permalink_redirect_$option");
if (!$$option) {
$$option = ($option == 'feedburnerbrand') ?
'feeds.feedburner.com' : '';
}
if ($wp_version < '2' && !$$option) {
add_option("permalink_redirect_$option", $$option);
}
$optionvars[] = "permalink_redirect_$option";
}

$home = parse_url(get_option('home'));
?>
<div class="wrap">
<h2>Permalink Redirect Manager</h2>
<form action="options.php" method="post">
<fieldset class="options">
<legend>Paths to be skipped</legend>
<p>Separate each entry with a new line. Matched with regular expression.</p>
<textarea name="permalink_redirect_skip" style="width:98%;" rows="5"><?php echo htmlspecialchars($skip); ?></textarea>

<legend style="padding-top:20px">Path pairs to redirect from and to</legend>
<p>Separate each entry with a new line. Each line is [from]&lt;spaces&gt;[to].</p>
<textarea name="permalink_redirect_newpath" style="width:98%;" rows="5"><?php echo htmlspecialchars($newpath); ?></textarea>
<table class="optiontable" style="padding-top:20px">
<tr valign="top">
<th scope="row">Old Permalink Structures:</th>
<td><textarea name="permalink_redirect_oldstruct" id="permalink_redirect_oldstruct" style="width:98%" rows="3"><?php echo htmlspecialchars($oldstruct); ?></textarea><br/><small><a href="http://codex.wordpress.org/Using_Permalinks">Available tags</a>. One Permalink Structure per line. Current permalink structure: <a href="#" onclick="document.getElementById('permalink_redirect_oldstruct').value = '<?php echo htmlspecialchars(get_option('permalink_structure')); ?>';return false;"><code><?php echo htmlspecialchars(get_option('permalink_structure')); ?></code></a></small></td>
</tr>
<tr>
<th scope="row">FeedBurner Redirect:</th>
<td>http://<input name="permalink_redirect_feedburnerbrand" type="text" id="permalink_redirect_feedburnerbrand" value="<?php print htmlspecialchars($feedburnerbrand); ?>" size="20"/>/<input name="permalink_redirect_feedburner" type="text" id="permalink_redirect_feedburner" value="<?php echo htmlspecialchars($feedburner) ?>" size="20" /></td>
</tr>
<tr>
<th scope="row">Hostname Redirect:</th>
<td><input name="permalink_redirect_hostname" type="checkbox" id="permalink_redirect_hostname" value="1"<?php if ($hostname) { ?> checked="checked"<?php } ?>/> Redirect if hostname is not <code><?php echo htmlspecialchars($home['host']); ?></code>.</td>
</tr>
</table>
</fieldset>
<p class="submit">
<input type="submit" name="Submit" value="<?php _e('Update Options') ?> &raquo;" />
<input type="hidden" name="action" value="update" />
<input type="hidden" name="page_options" value="<?php echo join(',', $optionvars); ?>"/>
<?php if (function_exists('wp_nonce_field')) { wp_nonce_field('update-options'); } ?>
</p>
</form>
</div>
<?php
}

function check_hostname() {
if (! get_option('permalink_redirect_hostname')) {
return false;
}
$requested = $_SERVER['HTTP_HOST'];
$home = parse_url(get_option('home'));
return $requested != $home['host'];
}

function execute() {
global $wp_query;
$this->execute2($wp_query);
}

function execute2($query, $testold=true) {
$req_uri = $_SERVER['REQUEST_URI'];

if ($query->is_trackback ||
$query->is_search ||
$query->is_comments_popup ||
$query->is_robots ||
$this->is_skip($req_uri))
{
return;
}

$this->redirect_newpath($req_uri);
$this->redirect_feedburner($query);

if ($query->is_404) {
if ($testold) {
$this->redirect_old_permalink($req_uri);
}
return;
}

if (($req_uri = @parse_url($_SERVER['REQUEST_URI'])) === false) {
return;
}

$req_path = $req_uri['path'];
$new_uri = $this->guess_permalink($query);
if (!$new_uri) {
return;
}
$permalink = @parse_url($new_uri);

// WP2.1: If a static page has been set as the front-page, we'll get
// empty string here.
if (!$permalink['path']) {
$permalink['path'] = '/';
}
if (($req_path != $permalink['path']) || $this->check_hostname()) {
wp_redirect($new_uri, 301);
}
}

function guess_permalink($query) {
$haspost = count($query->posts) > 0;
$has_ut = function_exists('user_trailingslashit');

if (get_query_var('m')) {
// Handling special case with '?m=yyyymmddHHMMSS'
// Since there is no code for producing the archive links for
// is_time, we will give up and not trying any redirection.
$m = preg_replace('/[^0-9]/', '', get_query_var('m'));
switch (strlen($m)) {
case 4: // Yearly
$link = get_year_link($m);
break;
case 6: // Monthly
$link = get_month_link(substr($m, 0, 4), substr($m, 4, 2));
break;
case 8: // Daily
$link = get_day_link(substr($m, 0, 4), substr($m, 4, 2),
substr($m, 6, 2));
break;
default:
return false;
}
} elseif (($query->is_single || $query->is_page) && $haspost) {
$post = $query->posts[0];
$link = get_permalink($post->ID);
$page = get_query_var('page');
if ($page && $page > 1) {
$link = trailingslashit($link) . "$page";
if ($has_ut) {
$link = user_trailingslashit($link, 'paged');
} else {
$link .= '/';
}
}
// WP2.2: In WordPress 2.2+ is_home() returns false and is_page()
// returns true if front page is a static page.
if ($query->is_page && ('page' == get_option('show_on_front')) &&
$post->ID == get_option('page_on_front'))
{
$link = trailingslashit($link);
}
} elseif ($query->is_author && $haspost) {
global $wp_version;
if ($wp_version >= '2') {
$author = get_userdata(get_query_var('author'));
if ($author === false)
return false;
if (function_exists('get_author_posts_url')) {
$link = get_author_posts_url($author->ID,
$author->user_nicename);
} else {
$link = get_author_link(false, $author->ID,
$author->user_nicename);
}
// XXX: get_author_link seems to always return one with
// trailing slash. We have to call user_trailingslashit to
// make it right.
if ($has_ut) {
$link = user_trailingslashit($link);
}
} else {
// XXX: get_author_link() bug in WP 1.5.1.2
// s/author_nicename/user_nicename/
global $cache_userdata;
$userid = get_query_var('author');
$link = get_author_link(false, $userid,
$cache_userdata[$userid]->user_nicename);
}
} elseif ($query->is_category && $haspost) {
$link = get_category_link(get_query_var('cat'));
} elseif ($query->is_tag && $haspost) {
$link = get_tag_link(get_query_var('tag_id'));
} elseif ($query->is_day && $haspost) {
$link = get_day_link(get_query_var('year'),
get_query_var('monthnum'),
get_query_var('day'));
} elseif ($query->is_month && $haspost) {
$link = get_month_link(get_query_var('year'),
get_query_var('monthnum'));
} elseif ($query->is_year && $haspost) {
$link = get_year_link(get_query_var('year'));
} elseif ($query->is_home) {
// WP2.1: Handling "Posts page" option. In WordPress 2.1 is_home()
// returns true and is_page() returns false if home page has been
// set to a page, and we are getting the permalink of that page
// here.
if ((get_option('show_on_front') == 'page') &&
($pageid = get_option('page_for_posts')))
{
$link = trailingslashit(get_permalink($pageid));
} else {
$link = trailingslashit(get_option('home'));
}
} else {
return false;
}

if ($query->is_paged) {
$paged = get_query_var('paged');
if ($paged) {
$link = trailingslashit($link) . "page/$paged";
if ($has_ut) {
$link = user_trailingslashit($link, 'paged');
} else {
$link .= '/';
}
}
}

if ($query->is_feed) {
$link = trailingslashit($link) . 'feed';
if ($has_ut) {
$link = user_trailingslashit($link, 'feed');
} else {
$link .= '/';
}

}

return $link;
}

function is_feedburner() {
return strncmp('FeedBurner/', $_SERVER['HTTP_USER_AGENT'], 11) == 0;
}

function is_skip($path) {
$permalink_redirect_skip = get_option('permalink_redirect_skip');
$permalink_redirect_skip = explode("\n", $permalink_redirect_skip);

// Apply 'permalink_redirect_skip' filter so other plugins can
// customise the skip behaviour. (Denis de Bernardy @ 2006-04-23)
$permalink_redirect_skip = apply_filters('permalink_redirect_skip',
$permalink_redirect_skip);

foreach ($permalink_redirect_skip as $skip) {
$skip = trim($skip);
if ($skip && ereg($skip, $path))
return true;
}

return false;
}

function redirect_feedburner($query) {
// Check whether we need to do redirect for FeedBurner.
// NOTE this might not always get executed. For feeds,
// WP::send_headers() might send back a 304 before template_redirect
// action can be called.
global $withcomments;

if ($query->is_feed && !$query->is_archive && !$withcomments) {
if (($feedburner = get_option('permalink_redirect_feedburner')) &&
(strncmp('FeedBurner/', $_SERVER['HTTP_USER_AGENT'], 11) != 0))
{
$brand = get_option('permalink_redirect_feedburnerbrand');
$brand = $brand ? $brand : 'feeds.feedburner.com';
wp_redirect("http://$brand/$feedburner", 302);
}
}
}

// Static page redirect contributed by Sergey Menshikov.
function redirect_newpath($path) {
if ($newpathlist = get_option('permalink_redirect_newpath')) {
$newpathlist = explode("\n", $newpathlist);
foreach ($newpathlist as $newpath) {
$pair = preg_split('/\s+/', trim($newpath));
if ($pair[0] == $path) {
wp_redirect($pair[1], 301);
}
}
}
}

/**
* Called when the main execute function gets a 404 to check against old
* permalink structures and perform redirect if an old post can be
* matched.
*/
function redirect_old_permalink($req_uri) {
global $wp_query, $wp_rewrite;
global $wp_version;

$rules = get_option('permalink_redirect_rules');
if (!$rules) {
return;
}

// Backing up the rewrite object for you, imperative programmers!
$wp_rewrite_old = $wp_rewrite;

// Unsetting the globals. Argh! Evil global variables!
foreach ($wp_query->query_vars as $key => $val) {
unset($GLOBALS[$key]);
}

// Going through the rules.
foreach ($rules as $rules2) {
$wp2 = new WP();
$wp_rewrite = new YLSY_Rewrite();
$wp_rewrite->index = $wp_rewrite_old->index;
$wp_rewrite->rules = $rules2;

$wp2->parse_request();
if (isset($wp2->query_vars['error']) &&
($wp2->query_vars['error'] == 404))
{
continue;
}
$query = new WP_Query();
if ($wp_version >= '2.1') {
$posts = $query->query($wp2->query_vars);
} else {
$wp2->build_query_string();
$posts = $query->query($wp2->query_string);
}
if (count($posts) > 0) {
$wp_rewrite = $wp_rewrite_old;
$this->execute2($query, false);
return;
}
}

// Restoring global variables. We don't bother to reset the other
// variables as we are going to do a 404 anyway.
$wp_rewrite = $wp_rewrite_old;
}

/**
* This function is called after someone saved the old permalink
* structure. It will create cached version of rewrite rules from the
* old structure.
*/
function regenerate_rules() {
global $wp_rewrite;
$oldstruct = get_option('permalink_redirect_oldstruct');
if ($oldstruct) {
$rules = array();
$oldstruct = explode("\n", $oldstruct);
foreach ($oldstruct as $item) {
$rules2 = $wp_rewrite->generate_rewrite_rule(trim($item),
false, false, false, true);
$rules3 = array();
foreach ($rules2 as $match => $query) {
$query = preg_replace('/\$(\d+)/', '\$matches[\1]', $query);
$rules3[$match] = $query;
}
$rules[] = $rules3;
}
update_option('permalink_redirect_rules', $rules);
} else {
delete_option('permalink_redirect_rules');
}
}
}

/**
* I am a dummy class to simulate the WP_Rewite class, but only has one
* method implemented.
*/
class YLSY_Rewrite {
function wp_rewrite_rules() {
return $this->rules;
}
}

if (!function_exists('wp_redirect')) {
function wp_redirect($location, $status=301) {
global $is_IIS;

$location = apply_filters('wp_redirect', $location, $status);
$status = apply_filters('wp_redirect_status', $status, $location);

if (!$location)
return false;

if (function_exists('wp_sanitize_redirect')) {
$location = wp_sanitize_redirect($location);
}

if ($is_IIS) {
header("Refresh: 0;url=$location");
} else {
status_header($status);
header("Location: $location");
}
}
}

$_permalink_redirect = new YLSY_PermalinkRedirect();
add_action('admin_menu', array($_permalink_redirect, 'admin_menu'));
add_action('template_redirect', array($_permalink_redirect, 'execute'));

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