defender-security / vendor / web-token / jwt-core / JWKSet.php

JWKSet.php in Defender Security – Malware Scanner, Login Security & Firewall 3.1.0, at vendor/web-token/jwt-core/JWKSet.php

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1	<?php
2
3	declare(strict_types=1);
4
5	/*
6	* The MIT License (MIT)
7	*
8	* Copyright (c) 2014-2020 Spomky-Labs
9	*
10	* This software may be modified and distributed under the terms
11	* of the MIT license. See the LICENSE file for details.
12	*/
13
14	namespace Jose\Component\Core;
15
16	use function array_key_exists;
17	use ArrayIterator;
18	use function count;
19	use Countable;
20	use function in_array;
21	use InvalidArgumentException;
22	use function is_array;
23	use IteratorAggregate;
24	use JsonSerializable;
25	use Traversable;
26
27	class JWKSet implements Countable, IteratorAggregate, JsonSerializable
28	{
29	/**
30	* @var array
31	*/
32	private $keys = [];
33
34	/**
35	* @param JWK[] $keys
36	*
37	* @throws InvalidArgumentException if the list is invalid
38	*/
39	public function __construct(array $keys)
40	{
41	foreach ($keys as $k => $key) {
42	if (!$key instanceof JWK) {
43	throw new InvalidArgumentException('Invalid list. Should only contains JWK objects');
44	}
45
46	if ($key->has('kid')) {
47	unset($keys[$k]);
48	$this->keys[$key->get('kid')] = $key;
49	} else {
50	$this->keys[] = $key;
51	}
52	}
53	}
54
55	/**
56	* Creates a JWKSet object using the given values.
57	*
58	* @throws InvalidArgumentException if the keyset is not valid
59	*
60	* @return JWKSet
61	*/
62	public static function createFromKeyData(array $data): self
63	{
64	if (!isset($data['keys'])) {
65	throw new InvalidArgumentException('Invalid data.');
66	}
67	if (!is_array($data['keys'])) {
68	throw new InvalidArgumentException('Invalid data.');
69	}
70
71	$jwkset = new self([]);
72	foreach ($data['keys'] as $key) {
73	$jwk = new JWK($key);
74	if ($jwk->has('kid')) {
75	$jwkset->keys[$jwk->get('kid')] = $jwk;
76	} else {
77	$jwkset->keys[] = $jwk;
78	}
79	}
80
81	return $jwkset;
82	}
83
84	/**
85	* Creates a JWKSet object using the given Json string.
86	*
87	* @throws InvalidArgumentException if the data is not valid
88	*
89	* @return JWKSet
90	*/
91	public static function createFromJson(string $json): self
92	{
93	$data = json_decode($json, true);
94	if (!is_array($data)) {
95	throw new InvalidArgumentException('Invalid argument.');
96	}
97
98	return self::createFromKeyData($data);
99	}
100
101	/**
102	* Returns an array of keys stored in the key set.
103	*
104	* @return JWK[]
105	*/
106	public function all(): array
107	{
108	return $this->keys;
109	}
110
111	/**
112	* Add key to store in the key set.
113	* This method is immutable and will return a new object.
114	*
115	* @return JWKSet
116	*/
117	public function with(JWK $jwk): self
118	{
119	$clone = clone $this;
120
121	if ($jwk->has('kid')) {
122	$clone->keys[$jwk->get('kid')] = $jwk;
123	} else {
124	$clone->keys[] = $jwk;
125	}
126
127	return $clone;
128	}
129
130	/**
131	* Remove key from the key set.
132	* This method is immutable and will return a new object.
133	*
134	* @param int\|string $key Key to remove from the key set
135	*
136	* @return JWKSet
137	*/
138	public function without($key): self
139	{
140	if (!$this->has($key)) {
141	return $this;
142	}
143
144	$clone = clone $this;
145	unset($clone->keys[$key]);
146
147	return $clone;
148	}
149
150	/**
151	* Returns true if the key set contains a key with the given index.
152	*
153	* @param int\|string $index
154	*/
155	public function has($index): bool
156	{
157	return array_key_exists($index, $this->keys);
158	}
159
160	/**
161	* Returns the key with the given index. Throws an exception if the index is not present in the key store.
162	*
163	* @param int\|string $index
164	*
165	* @throws InvalidArgumentException if the index is not defined
166	*/
167	public function get($index): JWK
168	{
169	if (!$this->has($index)) {
170	throw new InvalidArgumentException('Undefined index.');
171	}
172
173	return $this->keys[$index];
174	}
175
176	/**
177	* Returns the values to be serialized.
178	*/
179	public function jsonSerialize(): array
180	{
181	return ['keys' => array_values($this->keys)];
182	}
183
184	/**
185	* Returns the number of keys in the key set.
186	*
187	* @param int $mode
188	*/
189	public function count($mode = COUNT_NORMAL): int
190	{
191	return count($this->keys, $mode);
192	}
193
194	/**
195	* Try to find a key that fits on the selected requirements.
196	* Returns null if not found.
197	*
198	* @param string $type Must be 'sig' (signature) or 'enc' (encryption)
199	* @param null\|Algorithm $algorithm Specifies the algorithm to be used
200	* @param array $restrictions More restrictions such as 'kid' or 'kty'
201	*
202	* @throws InvalidArgumentException if the key type is not valid (must be "sig" or "enc")
203	*/
204	public function selectKey(string $type, ?Algorithm $algorithm = null, array $restrictions = []): ?JWK
205	{
206	if (!in_array($type, ['enc', 'sig'], true)) {
207	throw new InvalidArgumentException('Allowed key types are "sig" or "enc".');
208	}
209
210	$result = [];
211	foreach ($this->keys as $key) {
212	$ind = 0;
213
214	$can_use = $this->canKeyBeUsedFor($type, $key);
215	if (false === $can_use) {
216	continue;
217	}
218	$ind += $can_use;
219
220	$alg = $this->canKeyBeUsedWithAlgorithm($algorithm, $key);
221	if (false === $alg) {
222	continue;
223	}
224	$ind += $alg;
225
226	if (false === $this->doesKeySatisfyRestrictions($restrictions, $key)) {
227	continue;
228	}
229
230	$result[] = ['key' => $key, 'ind' => $ind];
231	}
232
233	if (0 === count($result)) {
234	return null;
235	}
236
237	usort($result, [$this, 'sortKeys']);
238
239	return $result[0]['key'];
240	}
241
242	/**
243	* Internal method only. Should not be used.
244	*
245	* @internal
246	* @internal
247	*/
248	public static function sortKeys(array $a, array $b): int
249	{
250	if ($a['ind'] === $b['ind']) {
251	return 0;
252	}
253
254	return ($a['ind'] > $b['ind']) ? -1 : 1;
255	}
256
257	/**
258	* Internal method only. Should not be used.
259	*
260	* @internal
261	*/
262	public function getIterator(): Traversable
263	{
264	return new ArrayIterator($this->keys);
265	}
266
267	/**
268	* @throws InvalidArgumentException if the key does not fulfill with the "key_ops" constraint
269	*
270	* @return bool\|int
271	*/
272	private function canKeyBeUsedFor(string $type, JWK $key)
273	{
274	if ($key->has('use')) {
275	return $type === $key->get('use') ? 1 : false;
276	}
277	if ($key->has('key_ops')) {
278	$key_ops = $key->get('key_ops');
279	if (!is_array($key_ops)) {
280	throw new InvalidArgumentException('Invalid key parameter "key_ops". Should be a list of key operations');
281	}
282
283	return $type === self::convertKeyOpsToKeyUse($key_ops) ? 1 : false;
284	}
285
286	return 0;
287	}
288
289	/**
290	* @return bool\|int
291	*/
292	private function canKeyBeUsedWithAlgorithm(?Algorithm $algorithm, JWK $key)
293	{
294	if (null === $algorithm) {
295	return 0;
296	}
297	if (!in_array($key->get('kty'), $algorithm->allowedKeyTypes(), true)) {
298	return false;
299	}
300	if ($key->has('alg')) {
301	return $algorithm->name() === $key->get('alg') ? 2 : false;
302	}
303
304	return 1;
305	}
306
307	private function doesKeySatisfyRestrictions(array $restrictions, JWK $key): bool
308	{
309	foreach ($restrictions as $k => $v) {
310	if (!$key->has($k) \|\| $v !== $key->get($k)) {
311	return false;
312	}
313	}
314
315	return true;
316	}
317
318	/**
319	* @throws InvalidArgumentException if the key operation is not supported
320	*/
321	private static function convertKeyOpsToKeyUse(array $key_ops): string
322	{
323	switch (true) {
324	case in_array('verify', $key_ops, true):
325	case in_array('sign', $key_ops, true):
326	return 'sig';
327
328	case in_array('encrypt', $key_ops, true):
329	case in_array('decrypt', $key_ops, true):
330	case in_array('wrapKey', $key_ops, true):
331	case in_array('unwrapKey', $key_ops, true):
332	case in_array('deriveKey', $key_ops, true):
333	case in_array('deriveBits', $key_ops, true):
334	return 'enc';
335
336	default:
337	throw new InvalidArgumentException(sprintf('Unsupported key operation value "%s"', implode(', ', $key_ops)));
338	}
339	}
340	}
341