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UriNormalizer.php

<?php

declare(strict_types=1);

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\UriInterface;

/**
 * Provides methods to normalize and compare URIs.
 *
 * @author Tobias Schultze
 *
 * @see https://datatracker.ietf.org/doc/html/rfc3986#section-6
 */
final class UriNormalizer
{
    /**
     * Default normalizations which only include the ones that preserve semantics.
     */
    public const PRESERVING_NORMALIZATIONS =
        self::CAPITALIZE_PERCENT_ENCODING |
        self::DECODE_UNRESERVED_CHARACTERS |
        self::CONVERT_EMPTY_PATH |
        self::REMOVE_DEFAULT_HOST |
        self::REMOVE_DEFAULT_PORT |
        self::REMOVE_DOT_SEGMENTS;

/**
     * All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
     *
     * Example: http://example.org/a%c2%b1b → http://example.org/a%C2%B1b
     */
    public const CAPITALIZE_PERCENT_ENCODING = 1;

/**
     * Decodes percent-encoded octets of unreserved characters.
     *
     * For consistency, percent-encoded octets in the ranges of ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39),
     * hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should not be created by URI producers and,
     * when found in a URI, should be decoded to their corresponding unreserved characters by URI normalizers.
     *
     * Example: http://example.org/%7Eusern%61me/ → http://example.org/~username/
     */
    public const DECODE_UNRESERVED_CHARACTERS = 2;

/**
     * Converts the empty path to "/" for http and https URIs.
     *
     * Example: http://example.org → http://example.org/
     */
    public const CONVERT_EMPTY_PATH = 4;

/**
     * Removes the default host of the given URI scheme from the URI.
     *
     * Only the "file" scheme defines the default host "localhost".
     * All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile`
     * are equivalent according to RFC 3986. The first format is not accepted
     * by PHPs stream functions and thus already normalized implicitly to the
     * second format in the Uri class. See `GuzzleHttp\Psr7\Uri::composeComponents`.
     *
     * Example: file://localhost/myfile → file:///myfile
     */
    public const REMOVE_DEFAULT_HOST = 8;

/**
     * Removes the default port of the given URI scheme from the URI.
     *
     * Example: http://example.org:80/ → http://example.org/
     */
    public const REMOVE_DEFAULT_PORT = 16;

/**
     * Removes unnecessary dot-segments.
     *
     * Dot-segments in relative-path references are not removed as it would
     * change the semantics of the URI reference.
     *
     * Example: http://example.org/../a/b/../c/./d.html → http://example.org/a/c/d.html
     */
    public const REMOVE_DOT_SEGMENTS = 32;

/**
     * Paths which include two or more adjacent slashes are converted to one.
     *
     * Webservers usually ignore duplicate slashes and treat those URIs equivalent.
     * But in theory those URIs do not need to be equivalent. So this normalization
     * may change the semantics. Encoded slashes (%2F) are not removed.
     *
     * Example: http://example.org//foo///bar.html → http://example.org/foo/bar.html
     */
    public const REMOVE_DUPLICATE_SLASHES = 64;

/**
     * Sort query parameters with their values in alphabetical order.
     *
     * However, the order of parameters in a URI may be significant (this is not defined by the standard).
     * So this normalization is not safe and may change the semantics of the URI.
     *
     * Example: ?lang=en&article=fred → ?article=fred&lang=en
     *
     * Note: The sorting is neither locale nor Unicode aware (the URI query does not get decoded at all) as the
     * purpose is to be able to compare URIs in a reproducible way, not to have the params sorted perfectly.
     */
    public const SORT_QUERY_PARAMETERS = 128;

/**
     * Returns a normalized URI.
     *
     * The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
     * This methods adds additional normalizations that can be configured with the $flags parameter.
     *
     * PSR-7 UriInterface cannot distinguish between an empty component and a missing component as
     * getQuery(), getFragment() etc. always return a string. This means the URIs "/?#" and "/" are
     * treated equivalent which is not necessarily true according to RFC 3986. But that difference
     * is highly uncommon in reality. So this potential normalization is implied in PSR-7 as well.
     *
     * @param UriInterface $uri   The URI to normalize
     * @param int          $flags A bitmask of normalizations to apply, see constants
     *
     * @see https://datatracker.ietf.org/doc/html/rfc3986#section-6.2
     */
    public static function normalize(UriInterface $uri, int $flags = self::PRESERVING_NORMALIZATIONS): UriInterface
    {
        if ($flags & self::CAPITALIZE_PERCENT_ENCODING) {
            $uri = self::capitalizePercentEncoding($uri);
        }

if ($flags & self::DECODE_UNRESERVED_CHARACTERS) {
            $uri = self::decodeUnreservedCharacters($uri);
        }

if ($flags & self::CONVERT_EMPTY_PATH && $uri->getPath() === ''
            && ($uri->getScheme() === 'http' || $uri->getScheme() === 'https')
        ) {
            $uri = $uri->withPath('/');
        }

if ($flags & self::REMOVE_DEFAULT_HOST && $uri->getScheme() === 'file' && $uri->getHost() === 'localhost') {
            $uri = $uri->withHost('');
        }

if ($flags & self::REMOVE_DEFAULT_PORT && $uri->getPort() !== null && Uri::isDefaultPort($uri)) {
            $uri = $uri->withPort(null);
        }

if ($flags & self::REMOVE_DOT_SEGMENTS && !Uri::isRelativePathReference($uri)) {
            $uri = $uri->withPath(UriResolver::removeDotSegments($uri->getPath()));
        }

if ($flags & self::REMOVE_DUPLICATE_SLASHES) {
            $uri = $uri->withPath(preg_replace('#//++#', '/', $uri->getPath()));
        }

if ($flags & self::SORT_QUERY_PARAMETERS && $uri->getQuery() !== '') {
            $queryKeyValues = explode('&', $uri->getQuery());
            sort($queryKeyValues);
            $uri = $uri->withQuery(implode('&', $queryKeyValues));
        }

return $uri;
    }

/**
     * Whether two URIs can be considered equivalent.
     *
     * Both URIs are normalized automatically before comparison with the given $normalizations bitmask. The method also
     * accepts relative URI references and returns true when they are equivalent. This of course assumes they will be
     * resolved against the same base URI. If this is not the case, determination of equivalence or difference of
     * relative references does not mean anything.
     *
     * @param UriInterface $uri1           An URI to compare
     * @param UriInterface $uri2           An URI to compare
     * @param int          $normalizations A bitmask of normalizations to apply, see constants
     *
     * @see https://datatracker.ietf.org/doc/html/rfc3986#section-6.1
     */
    public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, int $normalizations = self::PRESERVING_NORMALIZATIONS): bool
    {
        return (string) self::normalize($uri1, $normalizations) === (string) self::normalize($uri2, $normalizations);
    }

private static function capitalizePercentEncoding(UriInterface $uri): UriInterface
    {
        $regex = '/(?:%[A-Fa-f0-9]{2})++/';

$callback = function (array $match): string {
            return strtoupper($match[0]);
        };

return
            $uri->withPath(
                preg_replace_callback($regex, $callback, $uri->getPath())
            )->withQuery(
                preg_replace_callback($regex, $callback, $uri->getQuery())
            );
    }

private static function decodeUnreservedCharacters(UriInterface $uri): UriInterface
    {
        $regex = '/%(?:2D|2E|5F|7E|3[0-9]|[46][1-9A-F]|[57][0-9A])/i';

$callback = function (array $match): string {
            return rawurldecode($match[0]);
        };

private function __construct()
    {
        // cannot be instantiated
    }
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	panaxpaw/panaxpaw	0755	2026-01-31 04:30:06
..	dir	-	panaxpaw/panaxpaw	0755	2026-01-31 04:30:06
Exception	dir	-	panaxpaw/panaxpaw	0755	2026-01-31 04:30:06
.htaccess	text/plain	127 B	panaxpaw/panaxpaw	0444	2026-01-31 04:30:06
AppendStream.php	text/x-php	5.81 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
BufferStream.php	text/x-php	3.14 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
CachingStream.php	text/x-php	4.48 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
DroppingStream.php	text/x-php	1.17 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
FnStream.php	text/x-php	4.21 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Header.php	text/x-php	3.85 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
HttpFactory.php	text/x-php	3 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
InflateStream.php	text/x-php	1.38 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
LazyOpenStream.php	text/x-php	1.06 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
LimitStream.php	text/x-php	4.2 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Message.php	text/x-php	8.14 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
MessageTrait.php	text/x-php	7.56 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
MimeType.php	text/x-php	53.75 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
MultipartStream.php	text/x-php	5.05 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
NoSeekStream.php	text/x-php	524 B	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
PumpStream.php	text/x-php	4.49 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Query.php	text/x-php	3.56 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Request.php	text/x-php	3.82 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Response.php	text/x-php	4.79 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Rfc7230.php	text/x-php	661 B	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
ServerRequest.php	text/x-php	9.33 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Stream.php	text/x-php	7.21 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
StreamDecoratorTrait.php	text/x-php	3.24 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
StreamWrapper.php	text/x-php	4.45 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
UploadedFile.php	text/x-php	4.75 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Uri.php	text/x-php	21.44 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
UriComparator.php	text/x-php	1.12 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
UriNormalizer.php	text/x-php	8.26 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
UriResolver.php	text/x-php	8.38 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34
Utils.php	text/x-php	15.21 KB	panaxpaw/panaxpaw	0644	2023-12-04 02:05:34

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