/**
* Normalizes the URL (some of the best parts of RFC 3986)
*
* @param unknown_type $url
* @return string
*/
public static function normalize_url($url)
{
// TODO return error for bad URLs
// Process from RFC 3986 http://en.wikipedia.org/wiki/URL_normalization
// Limiting protocols.
if (!parse_url($url, PHP_URL_SCHEME)) {
$url = 'http://' . $url;
}
$parsed_url = parse_url($url);
if ($parsed_url === false) {
return '';
}
// user and pass components are ignored
// TODO Removing or adding “www” as the first domain label.
$host = preg_replace('/^www\\./', '', $parsed_url['host']);
// Converting the scheme and host to lower case
$scheme = strtolower($parsed_url['scheme']);
$host = strtolower($host);
$path = $parsed_url['path'];
// TODO Capitalizing letters in escape sequences
// TODO Decoding percent-encoded octets of unreserved characters
// Removing the default port
$port = '';
if (isset($parsed_url['port'])) {
$port = $parsed_url['port'];
}
if ($port == 80) {
$port = '';
}
// Removing the fragment # (do not get fragment component)
// Removing directory index (i.e. index.html, index.php)
$path = str_replace('index.html', '', $path);
$path = str_replace('index.php', '', $path);
// Adding trailing /
$path_last_char = $path[strlen($path) - 1];
if ($path_last_char != '/') {
$path = $path . '/';
}
// TODO Removing dot-segments.
// TODO Replacing IP with domain name.
// TODO Removing duplicate slashes
$path = preg_replace("~\\\\+([\"\\'\\x00\\\\])~", "\$1", $path);
// construct URL
$url = $scheme . '://' . $host . $path;
// Add query params if they exist
// Sorting the query parameters.
// Removing unused query variables
// Removing default query parameters.
// Removing the "?" when the query is empty.
$query = '';
if (isset($parsed_url['query'])) {
$query = $parsed_url['query'];
}
if ($query) {
$query_parts = explode('&', $query);
$params = array();
foreach ($query_parts as $param) {
$items = explode('=', $param, 2);
$name = $items[0];
$value = '';
if (count($items) == 2) {
$value = $items[1];
}
$params[$name] = $value;
}
ksort($params);
$count_params = count($params);
if ($count_params > 0) {
$url .= '?';
$index = 0;
foreach ($params as $name => $value) {
$url .= $name;
if (strlen($value) != 0) {
$url .= '=' . $value;
}
if ($index++ < $count_params - 1) {
$url .= '&';
}
}
}
}
// Remove some query params which we do not want
$url = HA_Common::remove_query_string_params($url, HA_Common::$ignore_query_params);
return $url;
}
