221 lines
8.2 KiB
PHP
221 lines
8.2 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace GuzzleHttp\Psr7;
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use Psr\Http\Message\UriInterface;
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/**
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* Provides methods to normalize and compare URIs.
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*
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* @author Tobias Schultze
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*
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* @link https://tools.ietf.org/html/rfc3986#section-6
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*/
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final class UriNormalizer
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{
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/**
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* Default normalizations which only include the ones that preserve semantics.
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*/
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public const PRESERVING_NORMALIZATIONS =
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self::CAPITALIZE_PERCENT_ENCODING |
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self::DECODE_UNRESERVED_CHARACTERS |
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self::CONVERT_EMPTY_PATH |
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self::REMOVE_DEFAULT_HOST |
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self::REMOVE_DEFAULT_PORT |
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self::REMOVE_DOT_SEGMENTS;
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/**
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* All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
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*
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* Example: http://example.org/a%c2%b1b → http://example.org/a%C2%B1b
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*/
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public const CAPITALIZE_PERCENT_ENCODING = 1;
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/**
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* Decodes percent-encoded octets of unreserved characters.
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*
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* For consistency, percent-encoded octets in the ranges of ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39),
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* hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should not be created by URI producers and,
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* when found in a URI, should be decoded to their corresponding unreserved characters by URI normalizers.
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*
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* Example: http://example.org/%7Eusern%61me/ → http://example.org/~username/
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*/
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public const DECODE_UNRESERVED_CHARACTERS = 2;
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/**
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* Converts the empty path to "/" for http and https URIs.
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*
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* Example: http://example.org → http://example.org/
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*/
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public const CONVERT_EMPTY_PATH = 4;
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/**
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* Removes the default host of the given URI scheme from the URI.
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*
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* Only the "file" scheme defines the default host "localhost".
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* All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile`
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* are equivalent according to RFC 3986. The first format is not accepted
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* by PHPs stream functions and thus already normalized implicitly to the
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* second format in the Uri class. See `GuzzleHttp\Psr7\Uri::composeComponents`.
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*
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* Example: file://localhost/myfile → file:///myfile
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*/
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public const REMOVE_DEFAULT_HOST = 8;
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/**
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* Removes the default port of the given URI scheme from the URI.
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*
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* Example: http://example.org:80/ → http://example.org/
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*/
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public const REMOVE_DEFAULT_PORT = 16;
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/**
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* Removes unnecessary dot-segments.
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*
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* Dot-segments in relative-path references are not removed as it would
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* change the semantics of the URI reference.
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*
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* Example: http://example.org/../a/b/../c/./d.html → http://example.org/a/c/d.html
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*/
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public const REMOVE_DOT_SEGMENTS = 32;
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/**
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* Paths which include two or more adjacent slashes are converted to one.
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*
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* Webservers usually ignore duplicate slashes and treat those URIs equivalent.
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* But in theory those URIs do not need to be equivalent. So this normalization
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* may change the semantics. Encoded slashes (%2F) are not removed.
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*
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* Example: http://example.org//foo///bar.html → http://example.org/foo/bar.html
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*/
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public const REMOVE_DUPLICATE_SLASHES = 64;
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/**
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* Sort query parameters with their values in alphabetical order.
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*
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* However, the order of parameters in a URI may be significant (this is not defined by the standard).
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* So this normalization is not safe and may change the semantics of the URI.
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*
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* Example: ?lang=en&article=fred → ?article=fred&lang=en
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*
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* Note: The sorting is neither locale nor Unicode aware (the URI query does not get decoded at all) as the
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* purpose is to be able to compare URIs in a reproducible way, not to have the params sorted perfectly.
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*/
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public const SORT_QUERY_PARAMETERS = 128;
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/**
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* Returns a normalized URI.
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*
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* The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
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* This methods adds additional normalizations that can be configured with the $flags parameter.
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*
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* PSR-7 UriInterface cannot distinguish between an empty component and a missing component as
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* getQuery(), getFragment() etc. always return a string. This means the URIs "/?#" and "/" are
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* treated equivalent which is not necessarily true according to RFC 3986. But that difference
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* is highly uncommon in reality. So this potential normalization is implied in PSR-7 as well.
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*
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* @param UriInterface $uri The URI to normalize
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* @param int $flags A bitmask of normalizations to apply, see constants
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*
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* @link https://tools.ietf.org/html/rfc3986#section-6.2
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*/
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public static function normalize(UriInterface $uri, int $flags = self::PRESERVING_NORMALIZATIONS): UriInterface
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{
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if ($flags & self::CAPITALIZE_PERCENT_ENCODING) {
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$uri = self::capitalizePercentEncoding($uri);
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}
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if ($flags & self::DECODE_UNRESERVED_CHARACTERS) {
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$uri = self::decodeUnreservedCharacters($uri);
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}
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if ($flags & self::CONVERT_EMPTY_PATH && $uri->getPath() === '' &&
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($uri->getScheme() === 'http' || $uri->getScheme() === 'https')
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) {
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$uri = $uri->withPath('/');
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}
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if ($flags & self::REMOVE_DEFAULT_HOST && $uri->getScheme() === 'file' && $uri->getHost() === 'localhost') {
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$uri = $uri->withHost('');
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}
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if ($flags & self::REMOVE_DEFAULT_PORT && $uri->getPort() !== null && Uri::isDefaultPort($uri)) {
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$uri = $uri->withPort(null);
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}
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if ($flags & self::REMOVE_DOT_SEGMENTS && !Uri::isRelativePathReference($uri)) {
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$uri = $uri->withPath(UriResolver::removeDotSegments($uri->getPath()));
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}
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if ($flags & self::REMOVE_DUPLICATE_SLASHES) {
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$uri = $uri->withPath(preg_replace('#//++#', '/', $uri->getPath()));
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}
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if ($flags & self::SORT_QUERY_PARAMETERS && $uri->getQuery() !== '') {
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$queryKeyValues = explode('&', $uri->getQuery());
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sort($queryKeyValues);
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$uri = $uri->withQuery(implode('&', $queryKeyValues));
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}
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return $uri;
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}
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/**
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* Whether two URIs can be considered equivalent.
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*
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* Both URIs are normalized automatically before comparison with the given $normalizations bitmask. The method also
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* accepts relative URI references and returns true when they are equivalent. This of course assumes they will be
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* resolved against the same base URI. If this is not the case, determination of equivalence or difference of
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* relative references does not mean anything.
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*
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* @param UriInterface $uri1 An URI to compare
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* @param UriInterface $uri2 An URI to compare
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* @param int $normalizations A bitmask of normalizations to apply, see constants
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*
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* @link https://tools.ietf.org/html/rfc3986#section-6.1
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*/
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public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, int $normalizations = self::PRESERVING_NORMALIZATIONS): bool
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{
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return (string) self::normalize($uri1, $normalizations) === (string) self::normalize($uri2, $normalizations);
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}
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private static function capitalizePercentEncoding(UriInterface $uri): UriInterface
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{
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$regex = '/(?:%[A-Fa-f0-9]{2})++/';
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$callback = function (array $match) {
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return strtoupper($match[0]);
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};
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return
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$uri->withPath(
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preg_replace_callback($regex, $callback, $uri->getPath())
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)->withQuery(
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preg_replace_callback($regex, $callback, $uri->getQuery())
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);
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}
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private static function decodeUnreservedCharacters(UriInterface $uri): UriInterface
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{
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$regex = '/%(?:2D|2E|5F|7E|3[0-9]|[46][1-9A-F]|[57][0-9A])/i';
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$callback = function (array $match) {
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return rawurldecode($match[0]);
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};
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return
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$uri->withPath(
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preg_replace_callback($regex, $callback, $uri->getPath())
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)->withQuery(
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preg_replace_callback($regex, $callback, $uri->getQuery())
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);
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}
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private function __construct()
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{
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// cannot be instantiated
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}
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}
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