|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* This file is part of the Rate Limit package. |
|
4
|
|
|
* |
|
5
|
|
|
* Copyright (c) Nikola Posa |
|
6
|
|
|
* |
|
7
|
|
|
* For full copyright and license information, please refer to the LICENSE file, |
|
8
|
|
|
* located at the package root folder. |
|
9
|
|
|
*/ |
|
10
|
|
|
|
|
11
|
|
|
namespace RateLimit\Middleware; |
|
12
|
|
|
|
|
13
|
|
|
use RateLimit\Exception\RateLimitExceededException; |
|
14
|
|
|
use RateLimit\RateLimiterInterface; |
|
15
|
|
|
use RateLimit\Middleware\Identity\IdentityResolverInterface; |
|
16
|
|
|
use RateLimit\Middleware\Identity\IpAddressIdentityResolver; |
|
17
|
|
|
use Psr\Http\Message\RequestInterface; |
|
18
|
|
|
use Psr\Http\Message\ResponseInterface; |
|
19
|
|
|
|
|
20
|
|
|
/** |
|
21
|
|
|
* @author Nikola Posa <[email protected]> |
|
22
|
|
|
*/ |
|
23
|
|
|
final class RateLimitMiddleware |
|
24
|
|
|
{ |
|
25
|
|
|
const LIMIT_EXCEEDED_HTTP_STATUS_CODE = 429; //HTTP 429 "Too Many Requests" (RFC 6585) |
|
26
|
|
|
|
|
27
|
|
|
const HEADER_LIMIT = 'X-RateLimit-Limit'; |
|
28
|
|
|
const HEADER_REMAINING = 'X-RateLimit-Remaining'; |
|
29
|
|
|
const HEADER_RESET = 'X-RateLimit-Reset'; |
|
30
|
|
|
|
|
31
|
|
|
/** |
|
32
|
|
|
* @var RateLimiterInterface |
|
33
|
|
|
*/ |
|
34
|
|
|
private $rateLimiter; |
|
35
|
|
|
|
|
36
|
|
|
/** |
|
37
|
|
|
* @var IdentityResolverInterface |
|
38
|
|
|
*/ |
|
39
|
|
|
private $identityResolver; |
|
40
|
|
|
|
|
41
|
|
|
/** |
|
42
|
|
|
* @var Options |
|
43
|
|
|
*/ |
|
44
|
|
|
private $options; |
|
45
|
|
|
|
|
46
|
|
|
/** |
|
47
|
|
|
* @var string |
|
48
|
|
|
*/ |
|
49
|
|
|
private $identity; |
|
50
|
|
|
|
|
51
|
7 |
|
public function __construct(RateLimiterInterface $rateLimiter, IdentityResolverInterface $identityResolver, Options $options) |
|
52
|
|
|
{ |
|
53
|
7 |
|
$this->rateLimiter = $rateLimiter; |
|
54
|
7 |
|
$this->identityResolver = $identityResolver; |
|
55
|
7 |
|
$this->options = $options; |
|
56
|
7 |
|
} |
|
57
|
|
|
|
|
58
|
7 |
|
public static function createDefault(RateLimiterInterface $rateLimiter, array $options = []) |
|
59
|
|
|
{ |
|
60
|
7 |
|
return new self( |
|
61
|
7 |
|
$rateLimiter, |
|
62
|
7 |
|
new IpAddressIdentityResolver(), |
|
63
|
7 |
|
Options::fromArray($options) |
|
64
|
|
|
); |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
|
|
/** |
|
68
|
|
|
* {@inheritdoc} |
|
69
|
|
|
*/ |
|
70
|
7 |
|
public function __invoke(RequestInterface $request, ResponseInterface $response, callable $out = null) |
|
71
|
|
|
{ |
|
72
|
7 |
|
return $this->process($request, $response, $out); |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
7 |
|
public function process(RequestInterface $request, ResponseInterface $response, callable $out = null) |
|
76
|
|
|
{ |
|
77
|
7 |
|
if ($this->isWhitelisted($request)) { |
|
78
|
1 |
|
return $this->next($request, $response, $out); |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
6 |
|
$this->identity = $this->resolveIdentity($request); |
|
82
|
|
|
|
|
83
|
|
|
try { |
|
84
|
6 |
|
$this->rateLimiter->hit($this->identity); |
|
85
|
|
|
|
|
86
|
6 |
|
return $this->onBelowLimit($request, $response, $out); |
|
87
|
3 |
|
} catch (RateLimitExceededException $ex) { |
|
88
|
3 |
|
return $this->onLimitExceeded($request, $response); |
|
89
|
|
|
} |
|
90
|
|
|
} |
|
91
|
|
|
|
|
92
|
7 |
|
private function isWhitelisted(RequestInterface $request) |
|
93
|
|
|
{ |
|
94
|
7 |
|
$whitelist = $this->options->getWhitelist(); |
|
95
|
|
|
|
|
96
|
7 |
|
return $whitelist($request); |
|
97
|
|
|
} |
|
98
|
|
|
|
|
99
|
6 |
|
private function resolveIdentity(RequestInterface $request) |
|
100
|
|
|
{ |
|
101
|
6 |
|
return $this->identityResolver->getIdentity($request); |
|
102
|
|
|
} |
|
103
|
|
|
|
|
104
|
3 |
|
private function onLimitExceeded(RequestInterface $request, ResponseInterface $response) |
|
105
|
|
|
{ |
|
106
|
|
|
$response = $this |
|
107
|
3 |
|
->setRateLimitHeaders($response) |
|
108
|
3 |
|
->withStatus(self::LIMIT_EXCEEDED_HTTP_STATUS_CODE) |
|
109
|
|
|
; |
|
110
|
|
|
|
|
111
|
3 |
|
$limitExceededHandler = $this->options->getLimitExceededHandler(); |
|
112
|
3 |
|
$response = $limitExceededHandler($request, $response); |
|
113
|
|
|
|
|
114
|
3 |
|
return $response; |
|
115
|
|
|
} |
|
116
|
|
|
|
|
117
|
6 |
|
private function onBelowLimit(RequestInterface $request, ResponseInterface $response, callable $out = null) |
|
118
|
|
|
{ |
|
119
|
6 |
|
$response = $this->setRateLimitHeaders($response); |
|
120
|
|
|
|
|
121
|
6 |
|
return $this->next($request, $response, $out); |
|
122
|
|
|
} |
|
123
|
|
|
|
|
124
|
7 |
|
private function next(RequestInterface $request, ResponseInterface $response, callable $out = null) |
|
125
|
|
|
{ |
|
126
|
7 |
|
return $out ? $out($request, $response) : $response; |
|
127
|
|
|
} |
|
128
|
|
|
|
|
129
|
6 |
|
private function setRateLimitHeaders(ResponseInterface $response) |
|
130
|
|
|
{ |
|
131
|
|
|
return $response |
|
132
|
6 |
|
->withHeader(self::HEADER_LIMIT, (string) $this->rateLimiter->getLimit()) |
|
133
|
6 |
|
->withHeader(self::HEADER_REMAINING, (string) $this->rateLimiter->getRemainingAttempts($this->identity)) |
|
134
|
6 |
|
->withHeader(self::HEADER_RESET, (string) $this->rateLimiter->getResetAt($this->identity)) |
|
135
|
|
|
; |
|
136
|
|
|
} |
|
137
|
|
|
} |
|
138
|
|
|
|
WellingGuzman /
rate-limit
