WordPress/wp-includes/links-update-xml.php

172 lines
4.8 KiB
PHP

<?php
// Links weblogs.com grabber
// Copyright (C) 2003 Mike Little -- mike@zed1.com
require_once('wp-config.php');
// globals to hold state
$updated_timestamp = 0;
$all_links = array();
/**
** preload_links()
** Pre-load the visible, non-blank, links into an associative array $all_links
** key is url, value is array of link_id and update_time
** Note: update time is initialised to 0. That way we only have to update (in
** the db) the ones which have been updated (on weblogs.com).
**/
function preload_links() {
global $tablelinks, $all_links, $wpdb;
$links = $wpdb->get_results("SELECT link_id, link_url FROM $tablelinks WHERE link_visible = 'Y' AND link_url <> ''");
foreach ($links as $link) {
$link_url = transform_url($link->link_url);
$all_links[$link_url] = array($link->link_id, 0);
}
}
/**
** update_links()
** Update in the db the links which have been updated ($all_links[url][1] != 0)
**/
function update_links() {
global $tablelinks, $all_links, $wpdb;
reset($all_links);
while (list($id, $val) = each($all_links)) {
if ($val[1]) {
$wpdb->query("UPDATE $tablelinks SET link_updated = '$val[1]' WHERE link_id = $val[0]");
}
} // end while
}
/**
** get_weblogs_updatedfile()
** Retrieves and caches a copy of the weblogs.com changed blogs xml file.
** If the file exists check it's age, get new copy if old.
** If a new or updated file has been written return true (needs processing)
** otherwise return false (nothing to do)
**/
function get_weblogs_updatedfile() {
global $ignore_weblogs_cache,ABSPATH;
$update = false;
if ($ignore_weblogs_cache) {
$update = true;
} else {
if (file_exists(get_settings('weblogs_cache_file'))) {
// is it old?
$modtime = filemtime(get_settings('weblogs_cache_file'));
if ((time() - $modtime) > (get_settings('weblogs_cacheminutes') * 60)) {
$update = true;
}
} else { // doesn't exist
$update = true;
}
}
if ($update) {
// get a new copy
$a = @file(get_settings('weblogs_xml_url'));
if ($a != false && count($a) && $a[0]) {
$contents = implode('', $a);
// Clean up the input, because weblogs.com doesn't output clean XML
$contents = preg_replace("/'/",'&#39;',$contents);
$contents = preg_replace('|[^[:space:][:punct:][:alpha:][:digit:]]|','',$contents);
$cachefp = fopen(get_settings('weblogs_cache_file'), "w");
fwrite($cachefp, $contents);
fclose($cachefp);
} else {
return false; //don't try to process
}
}
return $update;
}
/**
** startElement()
** Callback function. Called at the start of a new xml tag.
**/
function startElement($parser, $tagName, $attrs) {
global $updated_timestamp, $all_links;
if ($tagName == 'WEBLOGUPDATES') {
//convert 'updated' into php date variable
$updated_timestamp = strtotime($attrs['UPDATED']);
//echo('got timestamp of ' . gmdate('F j, Y, H:i:s', $updated_timestamp) . "\n");
} else if ($tagName == 'WEBLOG') {
// is this url in our links?
$link_url = transform_url($attrs['URL']);
if (isset($all_links[$link_url])) {
$all_links[$link_url][1] = date('YmdHis', $updated_timestamp - $attrs['WHEN']);
//echo('set link id ' . $all_links[$link_url][0] . ' to date ' . $all_links[$link_url][1] . "\n");
}
}
}
/**
** endElement()
** Callback function. Called at the end of an xml tag.
**/
function endElement($parser, $tagName) {
// nothing to do.
}
/**
** transform_url()
** Transforms a url to a minimal identifier.
**
** Remove www, remove index.* or default.*, remove
** trailing slash
**/
function transform_url($url) {
global ABSPATH;
//echo("transform_url(): $url ");
$url = str_replace('www.', '', $url);
$url = str_replace('WWW.', '', $url);
$url = preg_replace('/(?:index|default)\.[a-z]{2,}/i', '', $url);
if (substr($url, -1, 1) == '/') {
$url = substr($url, 0, -1);
}
//echo(" now equals $url\n");
return $url;
} // end transform_url
// get/update the cache file.
// true return means new copy
if (get_weblogs_updatedfile()) {
//echo('<pre>');
// pre-load the links
preload_links();
// Create an XML parser
$xml_parser = xml_parser_create();
// Set the functions to handle opening and closing tags
xml_set_element_handler($xml_parser, "startElement", "endElement");
// Open the XML file for reading
$fp = fopen(ABSPATH.get_settings('weblogs_cache_file'), "r")
or die("Error reading XML data.");
// Read the XML file 16KB at a time
while ($data = fread($fp, 16384)) {
// Parse each 4KB chunk with the XML parser created above
xml_parse($xml_parser, $data, feof($fp))
or die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($xml_parser)),
xml_get_current_line_number($xml_parser)));
}
// Close the XML file
fclose($fp);
// Free up memory used by the XML parser
xml_parser_free($xml_parser);
// now update the db with latest times
update_links();
//echo('</pre>');
} // end if updated cache file
?>