|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace mindplay\middleman; |
|
4
|
|
|
|
|
5
|
|
|
use LogicException; |
|
6
|
|
|
use Psr\Http\Message\RequestInterface; |
|
7
|
|
|
use Psr\Http\Message\ResponseInterface; |
|
8
|
|
|
|
|
9
|
|
|
/** |
|
10
|
|
|
* PSR-7 middleware dispatcher |
|
11
|
|
|
*/ |
|
12
|
|
|
class Dispatcher implements MiddlewareInterface |
|
13
|
|
|
{ |
|
14
|
|
|
/** |
|
15
|
|
|
* @var callable middleware resolver |
|
16
|
|
|
*/ |
|
17
|
|
|
private $resolver; |
|
18
|
|
|
|
|
19
|
|
|
/** |
|
20
|
|
|
* @var mixed[] unresolved middleware stack |
|
21
|
|
|
*/ |
|
22
|
|
|
private $stack; |
|
23
|
|
|
|
|
24
|
|
|
/** |
|
25
|
|
|
* @var (callable|MiddlewareInterface)[] resolved middleware stack |
|
26
|
|
|
*/ |
|
27
|
|
|
private $resolved = []; |
|
28
|
|
|
|
|
29
|
|
|
/** |
|
30
|
|
|
* @param (callable|MiddlewareInterface|mixed)[] $stack middleware stack |
|
31
|
|
|
* @param callable|null $resolver optional middleware resolver: |
|
32
|
|
|
* function (string $name): MiddlewareInterface |
|
33
|
|
|
*/ |
|
34
|
1 |
|
public function __construct(array $stack, callable $resolver = null) |
|
35
|
|
|
{ |
|
36
|
1 |
|
$this->stack = $stack; |
|
37
|
1 |
|
$this->resolver = $resolver; |
|
38
|
1 |
|
} |
|
39
|
|
|
|
|
40
|
|
|
/** |
|
41
|
|
|
* Dispatches the middleware stack and returns the resulting `ResponseInterface`. |
|
42
|
|
|
* |
|
43
|
|
|
* @param RequestInterface $request |
|
44
|
|
|
* @param ResponseInterface $response |
|
45
|
|
|
* |
|
46
|
|
|
* @return ResponseInterface |
|
47
|
|
|
* |
|
48
|
|
|
* @throws LogicException on unexpected result from any middleware on the stack |
|
49
|
|
|
*/ |
|
50
|
1 |
|
public function dispatch(RequestInterface $request, ResponseInterface $response) |
|
51
|
|
|
{ |
|
52
|
1 |
|
$resolved = $this->resolve(0); |
|
53
|
|
|
|
|
54
|
1 |
|
return $resolved($request, $response); |
|
55
|
|
|
} |
|
56
|
|
|
|
|
57
|
|
|
/** |
|
58
|
|
|
* @inheritdoc |
|
59
|
|
|
*/ |
|
60
|
1 |
|
public function __invoke(RequestInterface $request, ResponseInterface $response, callable $next) |
|
61
|
|
|
{ |
|
62
|
1 |
|
return $next($request, $this->dispatch($request, $response)); |
|
63
|
|
|
} |
|
64
|
|
|
|
|
65
|
|
|
/** |
|
66
|
|
|
* @param int $index middleware stack index |
|
67
|
|
|
* |
|
68
|
|
|
* @return callable middleware delegate: |
|
69
|
|
|
* function (RequestInterface $request, ResponseInterface $response): ResponseInterface |
|
70
|
|
|
* |
|
71
|
|
|
* @throws LogicException on unexpected middleware result |
|
72
|
|
|
*/ |
|
73
|
1 |
|
private function resolve($index) |
|
74
|
|
|
{ |
|
75
|
1 |
|
if (isset($this->stack[$index])) { |
|
76
|
|
|
return function (RequestInterface $request, ResponseInterface $response) use ($index) { |
|
77
|
1 |
|
if (!isset($this->resolved[$index])) { |
|
78
|
1 |
|
$this->resolved[$index] = $this->resolver |
|
79
|
1 |
|
? call_user_func($this->resolver, $this->stack[$index]) |
|
80
|
1 |
|
: $this->stack[$index]; // as-is |
|
81
|
1 |
|
} |
|
82
|
|
|
|
|
83
|
1 |
|
$middleware = $this->resolved[$index]; |
|
84
|
|
|
|
|
85
|
1 |
|
$result = $middleware($request, $response, $this->resolve($index + 1)); |
|
86
|
|
|
|
|
87
|
1 |
|
if (!$result instanceof ResponseInterface) { |
|
88
|
1 |
|
throw new LogicException("unexpected middleware result"); |
|
89
|
|
|
} |
|
90
|
|
|
|
|
91
|
1 |
|
return $result; |
|
92
|
1 |
|
}; |
|
93
|
|
|
} |
|
94
|
|
|
|
|
95
|
1 |
|
return function (RequestInterface $request, ResponseInterface $response) { |
|
96
|
1 |
|
return $response; |
|
97
|
1 |
|
}; |
|
98
|
|
|
} |
|
99
|
|
|
} |
|
100
|
|
|
|
mindplay-dk /
middleman
