$anchor = 'section:' . $matches[1];
}
// we are linking to a category
if (preg_match('/\\/categories\\/view.php\\/(\\w+)/', $target, $matches)) {
$anchor = 'category:' . $matches[1];
} elseif (preg_match('/\\/categories\\/view.php\\?id=(\\w+)/', $target, $matches)) {
$anchor = 'category:' . $matches[1];
}
// caller has been banned
if (isset($_SERVER['REMOTE_HOST']) && ($server = Servers::get($_SERVER['REMOTE_HOST']) && $server['process_ping'] != 'Y')) {
$response = 49;
} elseif (!preg_match('/^' . preg_quote($context['url_to_home'], '/') . '/i', $target)) {
$response = 33;
} elseif (!$anchor) {
$response = 33;
} elseif (Links::have($source, $anchor)) {
$response = 48;
} elseif (($content = http::proceed($source)) === FALSE) {
$response = 16;
} else {
// ensure enough execution time
Safe::set_time_limit(30);
// we have to find a reference to the target here
if (($position = strpos($content, $target)) === FALSE) {
$response = 17;
} else {
// try to grab a title
if (preg_match("/<h1>(.*)<\\/h1>/i", $content, $matches)) {
$fields['title'] = $matches[1];
} elseif (preg_match("/<title>(.*)<\\/title>/i", $content, $matches)) {
$fields['title'] = $matches[1];
}
// nice display
$context['text'] .= '<li>' . Skin::build_link($item['link'], $item['title'], 'external');
if ($item['description']) {
$context['text'] .= ' - ' . $item['description'];
}
if ($item['category']) {
$context['text'] .= ' (' . $item['category'] . ')';
}
if ($item['pubDate']) {
$context['text'] .= ' ' . gmstrftime('%Y-%m-%d %H:%M:%S', strtotime($item['pubDate']));
}
// flag links
if ($banned_pattern && preg_match($banned_pattern, $item['link'])) {
$context['text'] .= BR . '(' . i18n::s('the target server is banned') . ')';
} elseif (Links::have($item['link'], $reference)) {
$context['text'] .= BR . '(' . i18n::s('this link exists in the database') . ')';
} else {
$context['text'] .= BR . '(' . i18n::s('this link has not been inserted in the database yet') . ')';
}
$context['text'] .= '</li>' . "\n";
}
$context['text'] .= '</ul>' . "\n";
}
}
// the related anchor
if (is_object($anchor)) {
$context['text'] .= '<p>' . sprintf(i18n::s('Related to %s'), Skin::build_link($anchor->get_url(), $anchor->get_title(), 'category')) . "</p>\n";
}
// insert anchor suffix
if (is_object($anchor)) {
$context['page_title'] = sprintf(i18n::s('Reference: %s'), $title);
}
// stop crawlers
if (Surfer::is_crawler()) {
Safe::header('Status: 401 Unauthorized', TRUE, 401);
Logger::error(i18n::s('You are not allowed to perform this operation.'));
// process uploaded data
} elseif (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] == 'POST') {
// save the request if debug mode
if (isset($context['debug_trackback']) && $context['debug_trackback'] == 'Y') {
Logger::remember('links/trackback.php: trackback request', $_REQUEST, 'debug');
}
// do we have a valid target to track?
if (!$anchor || !is_object($anchor)) {
$response = array('faultCode' => 1, 'faultString' => 'Nothing to track');
} elseif (Links::have($source, $anchor->get_reference())) {
$response = array('faultCode' => 1, 'faultString' => 'The source has already been registered');
} elseif (($content = http::proceed($source)) === FALSE) {
$response = array('faultCode' => 1, 'faultString' => 'Cannot read source address ' . $source);
} else {
// ensure enough execution time
Safe::set_time_limit(30);
// we are coming from this form -- stop robots
if (strpos($_SERVER['HTTP_REFERER'], $context['script_url']) !== FALSE) {
if (Surfer::may_be_a_robot()) {
$response = array('faultCode' => 1, 'faultString' => 'Please prove you are not a robot');
}
// remote call -- get network address a.b.c.d of caller
} elseif (!isset($_SERVER['REMOTE_ADDR']) || !($ip = preg_replace('/[^0-9.]/', '', $_SERVER['REMOTE_ADDR']))) {
$response = array('faultCode' => 1, 'faultString' => 'Invalid request');
} elseif (!($items = @parse_url($source)) || !isset($items['host'])) {
/**
* get news from remote servers
*
* This function queries remote sources and populate the table of links based on fetched news.
*
* On tick, the including hook calls [code]Feeds::tick_hook()[/code].
* See [script]control/scan.php[/script] for a more complete description of hooks.
*
* The function browses the database to locate servers acting as feeders, and read the URLs to use.
*
* A round-robin algorithm is implemented, meaning that servers are polled in sequence throughout successive ticks.
* At most 1 feed is parsed on each tick, to limit impact when the "poor-man" cron mechanism is used,
* which is the default setting.
*
* XML feeds are fetched and parsed according to their type.
* At the moment YACS is able to process RSS and slashdot feeds.
* Link records are created or updated in the database saving as much of possible of provided data.
* Item data is reflected in Link, Title, and Description fields.
* Channel data is used to populate the Source field.
* Stamping information is based on feeding date, and channel title.
* Also, the edit action 'link:feed' marks links that are collected from feeders.
* The anchor field is set to the category assigned in the server profile.
*
* At the end of the feeding process, the database is purged from oldest links according to the limit
* defined in parameters/feeds.include.php, set through feeds/configure.php.
* See Links::purge_old_news().
*
* @param boolean if set to true, fetch news on each call; else use normal period of time
* @return a string to be displayed in resulting page, if any
*
* @see control/scan.php
* @see feeds/configure.php
*/
public static function tick_hook($forced = FALSE)
{
global $context;
// load librairies only once
include_once $context['path_to_root'] . 'links/links.php';
include_once $context['path_to_root'] . 'servers/servers.php';
include_once $context['path_to_root'] . 'shared/values.php';
// feeds.tick
// get feeding parameters
Safe::load('parameters/feeds.include.php');
// delay between feeds - minimum is 5 minutes
if (!isset($context['minutes_between_feeds']) || $context['minutes_between_feeds'] < 5) {
$context['minutes_between_feeds'] = 5;
}
// do not wait for the end of a feeding cycle
if ($forced) {
$threshold = gmstrftime('%Y-%m-%d %H:%M:%S');
} else {
$threshold = gmstrftime('%Y-%m-%d %H:%M:%S', time() - $context['minutes_between_feeds'] * 60);
}
// get a batch of feeders
if (!($feeders = Servers::list_for_feed(0, 1, 'feed'))) {
return 'feeds/feeds.php: no feed has been defined' . BR;
}
// remember start time
$start_time = get_micro_time();
// list banned tokens
$banned_pattern = Servers::get_banned_pattern();
// browse each feed
$count = 0;
foreach ($feeders as $server_id => $attributes) {
// get specific feed parameters
list($feed_url, $feed_title, $anchor, $stamp) = $attributes;
// skip servers processed recently
if ($stamp > $threshold) {
continue;
}
// flag this record to enable round-robin even on error
Servers::stamp($server_id);
// fetch news from the provided link
if (!($news = Feeds::get_remote_news_from($feed_url)) || !is_array($news)) {
continue;
}
// no anchor has been defined for this feed
if (!$anchor) {
// create a default section if necessary
if (!($anchor = Sections::lookup('external_news'))) {
$fields = array();
$fields['nick_name'] = 'external_news';
$fields['create_date'] = gmstrftime('%Y-%m-%d %H:%M:%S', time());
$fields['edit_date'] = gmstrftime('%Y-%m-%d %H:%M:%S', time());
$fields['index_map'] = 'N';
$fields['locked'] = 'Y';
// no direct contributions
$fields['rank'] = 40000;
// at the end of the list
$fields['title'] = i18n::c('External News');
$fields['description'] = i18n::c('Received from feeding servers');
if (!($fields['id'] = Sections::post($fields))) {
Logger::remember('feeds/feeds.php: Impossible to add a section.');
return;
}
$anchor = 'section:' . $fields['id'];
}
}
// process retrieved links
$links = 0;
foreach ($news as $item) {
// link has to be valid
if (!isset($item['link']) || !($item['title'] . $item['description'])) {
if (isset($context['debug_feeds']) && $context['debug_feeds'] == 'Y') {
Logger::remember('feeds/feeds.php: feed item is invalid', $item, 'debug');
}
continue;
}
// skip banned servers
if ($banned_pattern && preg_match($banned_pattern, $item['link'])) {
if (isset($context['debug_feeds']) && $context['debug_feeds'] == 'Y') {
Logger::remember('feeds/feeds.php: feed host has been banned', $item['link'], 'debug');
}
continue;
}
// one link processed
$links++;
// link description
$fields = array();
$fields['anchor'] = $anchor;
$fields['link_url'] = $item['link'];
$fields['title'] = $item['title'];
$fields['description'] = $item['description'];
if ($item['category']) {
$fields['description'] .= ' (' . $item['category'] . ')';
}
$fields['edit_name'] = $feed_title;
$fields['edit_address'] = $feed_url;
$fields['edit_action'] = 'link:feed';
if ($item['pubDate']) {
$fields['edit_date'] = gmstrftime('%Y-%m-%d %H:%M:%S', strtotime($item['pubDate']));
}
// update links that already exist in the database
if (Links::have($item['link'], $anchor, $fields)) {
continue;
}
// save link in the database
if (!Links::post($fields)) {
Logger::remember('feeds/feeds.php: Impossible to save feed link: ' . Logger::error_pop());
}
}
// one feed has been processed
$count += 1;
// remember tick date
Values::set('feeds.tick.' . $feed_url, $links);
}
// cap the number of links used for news
if (!isset($context['maximum_news']) || !$context['maximum_news']) {
$context['maximum_news'] = 1000;
}
if ($context['maximum_news'] > 10) {
include_once $context['path_to_root'] . 'links/links.php';
Links::purge_old_news($context['maximum_news']);
}
// compute execution time
$time = round(get_micro_time() - $start_time, 2);
// report on work achieved
if ($count > 1) {
return 'feeds/feeds.php: ' . $count . ' feeds have been processed (' . $time . ' seconds)' . BR;
} elseif ($count == 1) {
return 'feeds/feeds.php: 1 feed has been processed (' . $time . ' seconds)' . BR;
} else {
return 'feeds/feeds.php: nothing to do (' . $time . ' seconds)' . BR;
}
}
