|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Kevinrob\GuzzleCache\Strategy; |
|
4
|
|
|
|
|
5
|
|
|
use Kevinrob\GuzzleCache\CacheEntry; |
|
6
|
|
|
use Kevinrob\GuzzleCache\KeyValueHttpHeader; |
|
7
|
|
|
use Kevinrob\GuzzleCache\Storage\CacheStorageInterface; |
|
8
|
|
|
use Psr\Http\Message\RequestInterface; |
|
9
|
|
|
use Psr\Http\Message\ResponseInterface; |
|
10
|
|
|
|
|
11
|
|
|
/** |
|
12
|
|
|
* This strategy represents a "greedy" HTTP client. |
|
13
|
|
|
* |
|
14
|
|
|
* It can be used to cache responses in spite of any cache related response headers, |
|
15
|
|
|
* but it SHOULDN'T be used unless absolutely necessary, e.g. when accessing |
|
16
|
|
|
* badly designed APIs without Cache control. |
|
17
|
|
|
* |
|
18
|
|
|
* Obviously, this follows no RFC :(. |
|
19
|
|
|
*/ |
|
20
|
|
|
class GreedyCacheStrategy extends PrivateCacheStrategy |
|
21
|
|
|
{ |
|
22
|
|
|
/** |
|
23
|
|
|
* @var int |
|
24
|
|
|
*/ |
|
25
|
|
|
protected $ttl; |
|
26
|
|
|
|
|
27
|
|
|
/** |
|
28
|
|
|
* @var KeyValueHttpHeader |
|
29
|
|
|
*/ |
|
30
|
|
|
private $varyHeaders; |
|
31
|
|
|
|
|
32
|
8 |
|
public function __construct(CacheStorageInterface $cache = null, $ttl, KeyValueHttpHeader $varyHeaders = null) |
|
33
|
|
|
{ |
|
34
|
8 |
|
$this->ttl = $ttl; |
|
35
|
8 |
|
$this->varyHeaders = $varyHeaders; |
|
36
|
8 |
|
parent::__construct($cache); |
|
37
|
8 |
|
} |
|
38
|
|
|
|
|
39
|
7 |
|
protected function getCacheKey(RequestInterface $request, KeyValueHttpHeader $varyHeaders = null) |
|
40
|
|
|
{ |
|
41
|
7 |
|
if (null === $varyHeaders || $varyHeaders->isEmpty()) { |
|
42
|
6 |
|
return hash( |
|
43
|
6 |
|
'sha256', |
|
44
|
6 |
|
'greedy'.$request->getMethod().$request->getUri() |
|
45
|
6 |
|
); |
|
46
|
|
|
} |
|
47
|
|
|
|
|
48
|
1 |
|
$cacheHeaders = []; |
|
49
|
1 |
|
foreach ($varyHeaders as $key => $value) { |
|
50
|
1 |
|
if ($request->hasHeader($key)) { |
|
51
|
1 |
|
$cacheHeaders[$key] = $request->getHeader($key); |
|
52
|
1 |
|
} |
|
53
|
1 |
|
} |
|
54
|
|
|
|
|
55
|
1 |
|
return hash( |
|
56
|
1 |
|
'sha256', |
|
57
|
1 |
|
'greedy'.$request->getMethod().$request->getUri().json_encode($cacheHeaders) |
|
58
|
1 |
|
); |
|
59
|
|
|
} |
|
60
|
|
|
|
|
61
|
7 |
|
public function cache(RequestInterface $request, ResponseInterface $response) |
|
62
|
|
|
{ |
|
63
|
7 |
|
$warningMessage = sprintf('%d - "%s" "%s"', |
|
64
|
7 |
|
299, |
|
65
|
7 |
|
'Cached although the response headers indicate not to do it!', |
|
66
|
7 |
|
(new \DateTime())->format(\DateTime::RFC1123) |
|
67
|
7 |
|
); |
|
68
|
|
|
|
|
69
|
7 |
|
$response = $response->withAddedHeader('Warning', $warningMessage); |
|
70
|
|
|
|
|
71
|
7 |
|
if ($cacheObject = $this->getCacheObject($request, $response)) { |
|
72
|
6 |
|
return $this->storage->save( |
|
73
|
6 |
|
$this->getCacheKey($request, $this->varyHeaders), |
|
74
|
|
|
$cacheObject |
|
75
|
6 |
|
); |
|
76
|
|
|
} |
|
77
|
|
|
|
|
78
|
1 |
|
return false; |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
7 |
|
protected function getCacheObject(RequestInterface $request, ResponseInterface $response) |
|
82
|
|
|
{ |
|
83
|
7 |
|
if (!array_key_exists($response->getStatusCode(), $this->statusAccepted)) { |
|
84
|
|
|
// Don't cache it |
|
85
|
1 |
|
return null; |
|
86
|
|
|
} |
|
87
|
|
|
|
|
88
|
6 |
|
if (null !== $this->varyHeaders && $this->varyHeaders->has('*')) { |
|
89
|
|
|
// This will never match with a request |
|
90
|
|
|
return; |
|
91
|
|
|
} |
|
92
|
|
|
|
|
93
|
6 |
|
$response = $response->withoutHeader('Etag')->withoutHeader('Last-Modified'); |
|
94
|
6 |
|
return new CacheEntry($request, $response, new \DateTime(sprintf('+%d seconds', $this->ttl))); |
|
95
|
|
|
} |
|
96
|
|
|
|
|
97
|
7 |
|
public function fetch(RequestInterface $request) |
|
98
|
|
|
{ |
|
99
|
7 |
|
$cache = $this->storage->fetch($this->getCacheKey($request, $this->varyHeaders)); |
|
100
|
7 |
|
return $cache; |
|
101
|
|
|
} |
|
102
|
|
|
|
|
103
|
|
|
/** |
|
104
|
|
|
* {@inheritdoc} |
|
105
|
|
|
*/ |
|
106
|
|
|
public function delete(RequestInterface $request) |
|
107
|
|
|
{ |
|
108
|
|
|
return $this->storage->delete($this->getCacheKey($request)); |
|
109
|
|
|
} |
|
110
|
|
|
} |
|
111
|
|
|
|
Kevinrob /
guzzle-cache-middleware
