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d4802bcdb6
While IPv6 address normalization was originally planned, this was deemed too much effort to bother with such a niche feature; IPv6 addresses are instead passed through unmodified
97 lines
3.3 KiB
PHP
97 lines
3.3 KiB
PHP
<?php
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/** @license MIT
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* Copyright 2017 J. King, Dustin Wilson et al.
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* See LICENSE and AUTHORS files for details */
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declare(strict_types=1);
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namespace JKingWeb\Arsse\Misc;
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/**
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* A collection of functions for manipulating URLs
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*/
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class URL {
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/** User component */
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const P_USER = 1;
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/** Password component */
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const P_PASS = 2;
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/** Path segment component */
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const P_PATH = 3;
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/** Full query component */
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const P_QUERY = 4;
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/** Normalizes an absolute URL
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*
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* Normalizations performed are:
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*
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* - Lowercasing scheme
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* - Lowercasing ASCII host names
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* - IDN normalization
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* - Resolution of relative path segments
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* - Discarding empty path segments
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* - Discarding empty queries
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* - %-encoding normalization
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* - Fragment discarding
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*
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* It does NOT perform IPv6 address normalization, nor does it drop trailing slashes from paths
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*
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* @param string $url The URL to normalize. Relative URLs are returned unchanged
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* @param string $u Username to add to the URL, replacing any existing credentials
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* @param string $p Password to add to the URL, if a username is specified
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*/
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public static function normalize(string $url, string $u = null, string $p = null): string {
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extract(parse_url($url));
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if (!isset($scheme) || !isset($host) || !strlen($host)) {
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return $url;
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}
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$out = strtolower($scheme)."://";
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if (strlen($u ?? "")) {
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$out .= self::normalizePart(rawurlencode($u), self::P_USER, false);
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if (strlen($p ?? "")) {
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$out .= ":".self::normalizePart(rawurlencode($p), self::P_PASS, false);
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}
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$out .= "@";
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} elseif (strlen($user ?? "")) {
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$out .= self::normalizePart($user, self::P_USER);
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if (strlen($pass ?? "")) {
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$out .= ":".self::normalizePart($pass, self::P_PASS);
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}
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$out .= "@";
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}
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$out .= self::normalizeHost($host);
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$out .= isset($port) ? ":$port" : "";
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$out .= self::normalizePath($path ?? "");
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if (isset($query) && strlen($query)) {
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$out .= "?".self::normalizePart($query, self::P_QUERY);
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}
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return $out;
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}
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protected static function normalizePart(string $part, int $type, bool $passthrough_encoded = true): string {
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// stub
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return $part;
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}
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protected static function normalizeHost(string $host): string {
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$idn = idn_to_ascii($host, \IDNA_NONTRANSITIONAL_TO_ASCII, \INTL_IDNA_VARIANT_UTS46);
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return $idn !== false ? idn_to_utf8($idn, \IDNA_NONTRANSITIONAL_TO_UNICODE, \INTL_IDNA_VARIANT_UTS46) : $host;
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}
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/** Normalizes the whole path segment to remove empty segments and relative segments */
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protected static function normalizePath(string $path): string {
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$parts = explode("/", $path);
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$out = [];
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foreach($parts as $p) {
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switch ($p) {
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case "":
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case ".":
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break;
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case "..":
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array_pop($out);
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break;
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default:
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$out[] = self::normalizePart($p, self::P_PATH);
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}
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}
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return str_replace("//", "/", "/".implode("/", $out).(substr($path, -1) === "/" ? "/" : ""));
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}
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}
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