function wp_memento_catch_vars()
{
// Handle a timegate request
if (get_query_var('timegate_url')) {
// Get the requested URL and clean it up
$timegate_url = get_query_var('timegate_url');
$timegate_url = str_replace("http:/", "http://", $timegate_url);
$timegate_url .= "/";
// Pull the original post from the database
$post_id = url_to_postid($timegate_url);
// If it doesn't exist, throw a 404 error
if ($post_id == 0) {
include get_query_template('404');
exit;
}
// Get the requested memento datetime
$headers = getallheaders();
$accept_datetime = $headers["Accept-Datetime"];
// If no datetime is provided, redirect to the most recent version
if ($accept_datetime == '') {
// Do that here
wp_redirect($timegate_url);
exit;
}
// Verify that the provided datetime is valid
if (count(date_parse($accept_datetime)['errors']) > 0) {
header('HTTP/1.1 400 BAD REQUEST');
exit;
}
// Parse the datetime string into a date aware object
$accept_datetime = new DateTime($accept_datetime);
// Query all of the revisions for this post
$revisions = get_post_revisions($post_id);
// Loop through all of the posts ...
$revision_array = array();
foreach ($revisions as &$r) {
// And for each one pull the datetime
$date = new DateTime($r->post_date_gmt);
// And compare it against the submitted memento request
$diff = abs($date->getTimestamp() - $accept_datetime->getTimestamp());
// Key it into a new array using that difference
$revision_array[$diff] = $r;
}
// Resort the array so the one with the smallest difference is first
ksort($revision_array);
// Pull out that closest revision from array
$nearest_revision = array_values($revision_array)[0];
// Redirect the request to the detail page for that revision
$permalink = get_revision_permalink($nearest_revision->parent_post, $nearest_revision);
wp_redirect($permalink);
exit;
}
// Handle a timemap list request
if (get_query_var('timemap_url')) {
// Get the timemap URL and clean it up
$timemap_url = get_query_var('timemap_url');
$timemap_url = str_replace("http:/", "http://", $timemap_url);
$timemap_url .= "/";
// Pull the original post from the database
$post_id = url_to_postid($timemap_url);
// If it doesn't exist, throw a 404 error
if ($post_id == 0) {
include get_query_template('404');
exit;
}
// Render the timemap response
$charset = get_option('blog_charset');
header('Content-Type: application/link-format; charset=' . $charset);
$post = get_post($post_id);
$revision_list = get_post_revisions($post_id);
array_unshift($revision_list, $post);
include 'timemap-list.php';
// Finish
exit;
}
}
; rel="self";type="application/link-format"
; from="<?php
echo get_min_post_date_gmt($revision_list);
?>
GMT"
; until="<?php
echo get_max_post_date_gmt($revision_list);
?>
GMT",
<?php
$i = 0;
$len = count($revision_list);
foreach ($revision_list as $revision) {
?>
<<?php
echo get_revision_permalink($post, $revision);
?>
>
; rel="<?php
if ($i == 0) {
echo 'first ';
}
if ($i == $len - 1) {
echo 'last ';
}
?>
memento"; datetime="<?php
echo $revision->post_date_gmt;
?>
GMT"<?php
if ($i != $len - 1) {
