UriNormalizer.php — ShareThis Dashboard for Google Analytics 3.1.7

googleanalytics / lib / analytics-admin / vendor / guzzlehttp / psr7 / src / UriNormalizer.php

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UriNormalizer.php

221 lines

1	<?php
2
3	declare(strict_types=1);
4
5	namespace GuzzleHttp\Psr7;
6
7	use Psr\Http\Message\UriInterface;
8
9	/**
10	* Provides methods to normalize and compare URIs.
11	*
12	* @author Tobias Schultze
13	*
14	* @link https://tools.ietf.org/html/rfc3986#section-6
15	*/
16	final class UriNormalizer
17	{
18	/**
19	* Default normalizations which only include the ones that preserve semantics.
20	*/
21	public const PRESERVING_NORMALIZATIONS =
22	self::CAPITALIZE_PERCENT_ENCODING \|
23	self::DECODE_UNRESERVED_CHARACTERS \|
24	self::CONVERT_EMPTY_PATH \|
25	self::REMOVE_DEFAULT_HOST \|
26	self::REMOVE_DEFAULT_PORT \|
27	self::REMOVE_DOT_SEGMENTS;
28
29	/**
30	* All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
31	*
32	* Example: http://example.org/a%c2%b1b → http://example.org/a%C2%B1b
33	*/
34	public const CAPITALIZE_PERCENT_ENCODING = 1;
35
36	/**
37	* Decodes percent-encoded octets of unreserved characters.
38	*
39	* For consistency, percent-encoded octets in the ranges of ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39),
40	* hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should not be created by URI producers and,
41	* when found in a URI, should be decoded to their corresponding unreserved characters by URI normalizers.
42	*
43	* Example: http://example.org/%7Eusern%61me/ → http://example.org/~username/
44	*/
45	public const DECODE_UNRESERVED_CHARACTERS = 2;
46
47	/**
48	* Converts the empty path to "/" for http and https URIs.
49	*
50	* Example: http://example.org → http://example.org/
51	*/
52	public const CONVERT_EMPTY_PATH = 4;
53
54	/**
55	* Removes the default host of the given URI scheme from the URI.
56	*
57	* Only the "file" scheme defines the default host "localhost".
58	* All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile`
59	* are equivalent according to RFC 3986. The first format is not accepted
60	* by PHPs stream functions and thus already normalized implicitly to the
61	* second format in the Uri class. See `GuzzleHttp\Psr7\Uri::composeComponents`.
62	*
63	* Example: file://localhost/myfile → file:///myfile
64	*/
65	public const REMOVE_DEFAULT_HOST = 8;
66
67	/**
68	* Removes the default port of the given URI scheme from the URI.
69	*
70	* Example: http://example.org:80/ → http://example.org/
71	*/
72	public const REMOVE_DEFAULT_PORT = 16;
73
74	/**
75	* Removes unnecessary dot-segments.
76	*
77	* Dot-segments in relative-path references are not removed as it would
78	* change the semantics of the URI reference.
79	*
80	* Example: http://example.org/../a/b/../c/./d.html → http://example.org/a/c/d.html
81	*/
82	public const REMOVE_DOT_SEGMENTS = 32;
83
84	/**
85	* Paths which include two or more adjacent slashes are converted to one.
86	*
87	* Webservers usually ignore duplicate slashes and treat those URIs equivalent.
88	* But in theory those URIs do not need to be equivalent. So this normalization
89	* may change the semantics. Encoded slashes (%2F) are not removed.
90	*
91	* Example: http://example.org//foo///bar.html → http://example.org/foo/bar.html
92	*/
93	public const REMOVE_DUPLICATE_SLASHES = 64;
94
95	/**
96	* Sort query parameters with their values in alphabetical order.
97	*
98	* However, the order of parameters in a URI may be significant (this is not defined by the standard).
99	* So this normalization is not safe and may change the semantics of the URI.
100	*
101	* Example: ?lang=en&article=fred → ?article=fred&lang=en
102	*
103	* Note: The sorting is neither locale nor Unicode aware (the URI query does not get decoded at all) as the
104	* purpose is to be able to compare URIs in a reproducible way, not to have the params sorted perfectly.
105	*/
106	public const SORT_QUERY_PARAMETERS = 128;
107
108	/**
109	* Returns a normalized URI.
110	*
111	* The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
112	* This methods adds additional normalizations that can be configured with the $flags parameter.
113	*
114	* PSR-7 UriInterface cannot distinguish between an empty component and a missing component as
115	* getQuery(), getFragment() etc. always return a string. This means the URIs "/?#" and "/" are
116	* treated equivalent which is not necessarily true according to RFC 3986. But that difference
117	* is highly uncommon in reality. So this potential normalization is implied in PSR-7 as well.
118	*
119	* @param UriInterface $uri The URI to normalize
120	* @param int $flags A bitmask of normalizations to apply, see constants
121	*
122	* @link https://tools.ietf.org/html/rfc3986#section-6.2
123	*/
124	public static function normalize(UriInterface $uri, int $flags = self::PRESERVING_NORMALIZATIONS): UriInterface
125	{
126	if ($flags & self::CAPITALIZE_PERCENT_ENCODING) {
127	$uri = self::capitalizePercentEncoding($uri);
128	}
129
130	if ($flags & self::DECODE_UNRESERVED_CHARACTERS) {
131	$uri = self::decodeUnreservedCharacters($uri);
132	}
133
134	if ($flags & self::CONVERT_EMPTY_PATH && $uri->getPath() === '' &&
135	($uri->getScheme() === 'http' \|\| $uri->getScheme() === 'https')
136	) {
137	$uri = $uri->withPath('/');
138	}
139
140	if ($flags & self::REMOVE_DEFAULT_HOST && $uri->getScheme() === 'file' && $uri->getHost() === 'localhost') {
141	$uri = $uri->withHost('');
142	}
143
144	if ($flags & self::REMOVE_DEFAULT_PORT && $uri->getPort() !== null && Uri::isDefaultPort($uri)) {
145	$uri = $uri->withPort(null);
146	}
147
148	if ($flags & self::REMOVE_DOT_SEGMENTS && !Uri::isRelativePathReference($uri)) {
149	$uri = $uri->withPath(UriResolver::removeDotSegments($uri->getPath()));
150	}
151
152	if ($flags & self::REMOVE_DUPLICATE_SLASHES) {
153	$uri = $uri->withPath(preg_replace('#//++#', '/', $uri->getPath()));
154	}
155
156	if ($flags & self::SORT_QUERY_PARAMETERS && $uri->getQuery() !== '') {
157	$queryKeyValues = explode('&', $uri->getQuery());
158	sort($queryKeyValues);
159	$uri = $uri->withQuery(implode('&', $queryKeyValues));
160	}
161
162	return $uri;
163	}
164
165	/**
166	* Whether two URIs can be considered equivalent.
167	*
168	* Both URIs are normalized automatically before comparison with the given $normalizations bitmask. The method also
169	* accepts relative URI references and returns true when they are equivalent. This of course assumes they will be
170	* resolved against the same base URI. If this is not the case, determination of equivalence or difference of
171	* relative references does not mean anything.
172	*
173	* @param UriInterface $uri1 An URI to compare
174	* @param UriInterface $uri2 An URI to compare
175	* @param int $normalizations A bitmask of normalizations to apply, see constants
176	*
177	* @link https://tools.ietf.org/html/rfc3986#section-6.1
178	*/
179	public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, int $normalizations = self::PRESERVING_NORMALIZATIONS): bool
180	{
181	return (string) self::normalize($uri1, $normalizations) === (string) self::normalize($uri2, $normalizations);
182	}
183
184	private static function capitalizePercentEncoding(UriInterface $uri): UriInterface
185	{
186	$regex = '/(?:%[A-Fa-f0-9]{2})++/';
187
188	$callback = function (array $match) {
189	return strtoupper($match[0]);
190	};
191
192	return
193	$uri->withPath(
194	preg_replace_callback($regex, $callback, $uri->getPath())
195	)->withQuery(
196	preg_replace_callback($regex, $callback, $uri->getQuery())
197	);
198	}
199
200	private static function decodeUnreservedCharacters(UriInterface $uri): UriInterface
201	{
202	$regex = '/%(?:2D\|2E\|5F\|7E\|3[0-9]\|[46][1-9A-F]\|[57][0-9A])/i';
203
204	$callback = function (array $match) {
205	return rawurldecode($match[0]);
206	};
207
208	return
209	$uri->withPath(
210	preg_replace_callback($regex, $callback, $uri->getPath())
211	)->withQuery(
212	preg_replace_callback($regex, $callback, $uri->getQuery())
213	);
214	}
215
216	private function __construct()
217	{
218	// cannot be instantiated
219	}
220	}
221