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1<?php
2
3declare(strict_types=1);
4
5namespace LambdaTwelve\OneRecord\Server\Endpoint;
6
7use LambdaTwelve\OneRecord\Api\ServerInformation;
8use LambdaTwelve\OneRecord\Rdf\Iri;
9use LambdaTwelve\OneRecord\Server\Http\Negotiated;
10use LambdaTwelve\OneRecord\Server\Http\Responder;
11use LambdaTwelve\OneRecord\Server\Spi\Agent;
12use LambdaTwelve\OneRecord\Vocabulary\Generated\Api;
13use Psr\Http\Message\ResponseInterface;
14use Psr\Http\Message\ServerRequestInterface;
15
16/**
17 * GET /: api:ServerInformation. Authentication only; no access control, as the
18 * spec's security table says.
19 */
20final class ServerInformationEndpoint extends AbstractEndpoint
21{
22    public function handle(ServerRequestInterface $request, Agent $agent, Negotiated $negotiated, array $parameters): ResponseInterface
23    {
24        $config = $this->services->config;
25        $holderType = $config->dataHolderType;
26        if ($holderType === null) {
27            $holder = $this->services->objects->latest($config->dataHolder);
28            $holderType = $holder?->object->mostSpecificType($this->services->vocabulary);
29        }
30        $information = ServerInformation::for(new Iri($config->endpoint()), $config->dataHolder, $config->apiVersions, $config->dataModelVersions, $config->languages, $holderType);
31        // Server information changes only with configuration; "now" is the honest Last-Modified without a deployment timestamp.
32        $headers = ['Last-Modified' => Responder::httpDate($this->services->clock->now())];
33
34        return $this->services->responder->jsonLd(200, $information->toJsonLd(), $negotiated, Api::ServerInformation, $headers, self::isHead($request));
35    }
36}