/**
* Checks if the url belongs to one of the sites listed in site_array
* Sites can be either given in the form domain:host or
* in the form of a url in which case it is check that the site url
* is a substring of the passed url.
*
* @param string $url url to check
* @param array $site_array sites to check against
* @param string $name identifier to store $site_array with in this
* function's cache
* @param bool $return_rule whether when a match is found to return true or
* to return the matching site rule
* @return mixed whether the url belongs to one of the sites
*/
static function urlMemberSiteArray($url, $site_array, $name, $return_rule = false)
{
static $cache = array();
if (!is_array($site_array)) {
return false;
}
if (!isset($cache[$name])) {
if (count($cache) > 100) {
$cache = array();
}
$i = 0;
$cache[$name]["domains"] = array();
$cache[$name]["hosts"] = array();
$cache[$name]["paths"] = array();
$cache[$name]["sites"] = array();
foreach ($site_array as $site) {
if (strncmp($site, "domain:", 7) == 0) {
$cache[$name]["domains"][] = substr($site, 7);
continue;
}
list($site_host, $site_path) = UrlParser::getHostAndPath($site, true, true);
$cache[$name]["hosts"][] = $site_host;
$cache[$name]["paths"][] = $site_path;
$cache[$name]["sites"][] = $site;
$i++;
}
$cache[$name]["domains"] = array_values(array_unique($cache[$name]["domains"]));
}
$flag = false;
$domains =& $cache[$name]["domains"];
$hosts =& $cache[$name]["hosts"];
$paths =& $cache[$name]["paths"];
$sites =& $cache[$name]["sites"];
list($host, $path) = UrlParser::getHostAndPath($url, true, true);
foreach ($domains as $domain) {
$pos = strrpos($host, $domain);
if ($pos !== false && $pos + strlen($domain) == strlen($host)) {
if ($return_rule) {
return "domain:{$domain}";
}
return true;
}
}
$count = count($sites);
for ($i = 0; $i < $count; $i++) {
$flag = UrlParser::isPathMemberRegexPaths($host, array($hosts[$i]));
if (!$flag) {
continue;
}
$flag = UrlParser::isPathMemberRegexPaths($path, array($paths[$i]));
if ($flag) {
break;
}
}
if ($return_rule && $flag) {
$flag = $sites[$i];
}
return $flag;
}
/**
* Checks if the given $url is allowed to be crawled based on stored
* robots.txt info.
* @param string $url to check
* @return bool whether it was allowed or not
*/
function checkRobotOkay($url)
{
// local cache of recent robot.txt stuff
static $robot_cache = array();
$cache_size = 2000;
list($host, $path) = UrlParser::getHostAndPath($url, true, true);
$path = urldecode($path);
$key = crawlHash($host, true);
if (isset($robot_cache[$key])) {
$robot_object = $robot_cache[$key];
} else {
$data = $this->robot_table->lookup($key);
$offset = unpackInt($data);
$robot_object = $this->robot_archive->getObjects($offset, 1);
$robot_cache[$key] = $robot_object;
if (count($robot_cache) > $cache_size) {
array_shift($robot_cache);
}
}
$robot_paths = isset($robot_object[0][1]) ? $robot_object[0][1] : array();
//these should have been urldecoded in RobotProcessor
$robots_okay = true;
$robots_not_okay = false;
if (isset($robot_paths[CrawlConstants::DISALLOWED_SITES])) {
$robots_not_okay = UrlParser::isPathMemberRegexPaths($path, $robot_paths[CrawlConstants::DISALLOWED_SITES]);
$robots_okay = !$robots_not_okay;
}
if (isset($robot_paths[CrawlConstants::ALLOWED_SITES])) {
$robots_okay = UrlParser::isPathMemberRegexPaths($path, $robot_paths[CrawlConstants::ALLOWED_SITES]);
}
return $robots_okay || !$robots_not_okay;
}
