1 | <?php |
2 | |
3 | require_once __DIR__ . "/JsonResponse.php"; |
4 | require_once __DIR__ . "/ProblemDetails.php"; |
5 | |
6 | /** |
7 | * Ejecuta una funcion que implementa un servicio. |
8 | */ |
9 | function ejecutaServicio($servicio) |
10 | { |
11 | try { |
12 | $resultado = $servicio(); |
13 | if (!($resultado instanceof JsonResponse)) { |
14 | $resultado = JsonResponse::ok($resultado); |
15 | } |
16 | procesa_json_response($resultado); |
17 | } catch (ProblemDetails $details) { |
18 | procesa_problem_details($details); |
19 | } catch (Throwable $throwable) { |
20 | procesa_problem_details(new ProblemDetails( |
21 | status: ProblemDetails::InternalServerError, |
22 | type: "/error/errorinterno.html", |
23 | title: "Error interno del servidor.", |
24 | detail: $throwable->getMessage() |
25 | )); |
26 | } |
27 | } |
28 | |
29 | function procesa_json_response(JsonResponse $response) |
30 | { |
31 | $json = ""; |
32 | $body = $response->body; |
33 | if ($response->status !== JsonResponse_NoContent) { |
34 | $json = json_encode($body); |
35 | if ($json === false) { |
36 | no_puede_generar_json(); |
37 | return; |
38 | } |
39 | } |
40 | http_response_code($response->status); |
41 | if ($response->location !== null) { |
42 | header("Location: {$response->location}"); |
43 | } |
44 | if ($response->status !== JsonResponse_NoContent) { |
45 | header("Content-Type: application/json"); |
46 | echo $json; |
47 | } |
48 | } |
49 | |
50 | function procesa_problem_details(ProblemDetails $details) |
51 | { |
52 | $body = ["title" => $details->title]; |
53 | if ($details->type !== null) { |
54 | $body["type"] = $details->type; |
55 | } |
56 | if ($details->detail !== null) { |
57 | $body["detail"] = $details->detail; |
58 | } |
59 | $json = json_encode($body); |
60 | if ($json === false) { |
61 | no_puede_generar_json(); |
62 | } else { |
63 | http_response_code($details->status); |
64 | header("Content-Type: application/problem+json"); |
65 | echo $json; |
66 | } |
67 | } |
68 | |
69 | function no_puede_generar_json() |
70 | { |
71 | http_response_code(ProblemDetails::InternalServerError); |
72 | header("Content-Type: application/problem+json"); |
73 | echo '{"type":"/error/nojson.html"' |
74 | . ',"title":"El valor devuelto no puede representarse como JSON."}'; |
75 | } |
76 |
1 | <?php |
2 | |
3 | const JsonResponse_OK = 200; |
4 | const JsonResponse_Created = 201; |
5 | const JsonResponse_NoContent = 204; |
6 | |
7 | class JsonResponse |
8 | { |
9 | |
10 | public int $status; |
11 | public $body; |
12 | public ?string $location; |
13 | |
14 | public function __construct( |
15 | int $status = JsonResponse_OK, |
16 | $body = null, |
17 | ?string $location = null |
18 | ) { |
19 | $this->status = $status; |
20 | $this->body = $body; |
21 | $this->location = $location; |
22 | } |
23 | |
24 | public static function ok($body) |
25 | { |
26 | return new JsonResponse(body: $body); |
27 | } |
28 | |
29 | public static function created(string $location, $body) |
30 | { |
31 | return new JsonResponse(JsonResponse_Created, $body, $location); |
32 | } |
33 | |
34 | public static function noContent() |
35 | { |
36 | return new JsonResponse(JsonResponse_NoContent, null); |
37 | } |
38 | } |
39 |
1 | <?php |
2 | |
3 | /** |
4 | * Recupera el texto de un parámetro enviado al |
5 | * servidor por medio de GET, POST o cookie. |
6 | * Si el parámetro no se recibe, devuelve null. |
7 | */ |
8 | function leeTexto(string $parametro): ?string |
9 | { |
10 | /* Si el parámetro está asignado en $_REQUEST, |
11 | * devuelve su valor; de lo contrario, |
12 | * devuelve null. */ |
13 | $valor = isset($_REQUEST[$parametro]) |
14 | ? $_REQUEST[$parametro] |
15 | : null; |
16 | return $valor; |
17 | } |
18 |
1 | <?php |
2 | |
3 | class ProblemDetails extends Exception |
4 | { |
5 | |
6 | public const BadRequest = 400; |
7 | public const NotFound = 404; |
8 | public const InternalServerError = 500; |
9 | |
10 | public int $status; |
11 | public string $title; |
12 | public ?string $type; |
13 | public ?string $detail; |
14 | |
15 | public function __construct( |
16 | int $status, |
17 | string $title, |
18 | ?string $type = null, |
19 | ?string $detail = null, |
20 | Throwable $previous = null |
21 | ) { |
22 | parent::__construct($title, $status, $previous); |
23 | $this->status = $status; |
24 | $this->type = $type; |
25 | $this->title = $title; |
26 | $this->detail = $detail; |
27 | } |
28 | } |
29 |
1 | <?php |
2 | |
3 | function recibeFetchAll(false|array $resultado): array |
4 | { |
5 | if ($resultado === false) { |
6 | return []; |
7 | } else { |
8 | return $resultado; |
9 | } |
10 | } |
11 |