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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace LambdaTwelve\OneRecord\Server\Endpoint; |
| 6 | |
| 7 | use DateTimeImmutable; |
| 8 | use Exception; |
| 9 | use LambdaTwelve\OneRecord\JsonLd\Context; |
| 10 | use LambdaTwelve\OneRecord\JsonLd\Writer; |
| 11 | use LambdaTwelve\OneRecord\Model\LogisticsObject; |
| 12 | use LambdaTwelve\OneRecord\Rdf\Graph; |
| 13 | use LambdaTwelve\OneRecord\Rdf\Iri; |
| 14 | use LambdaTwelve\OneRecord\Rdf\Literal; |
| 15 | use LambdaTwelve\OneRecord\Rdf\Triple; |
| 16 | use LambdaTwelve\OneRecord\Server\Http\HttpException; |
| 17 | use LambdaTwelve\OneRecord\Server\Http\Negotiated; |
| 18 | use LambdaTwelve\OneRecord\Server\Http\Responder; |
| 19 | use LambdaTwelve\OneRecord\Server\Services; |
| 20 | use LambdaTwelve\OneRecord\Server\Spi\Action; |
| 21 | use LambdaTwelve\OneRecord\Server\Spi\Agent; |
| 22 | use LambdaTwelve\OneRecord\Server\Spi\Decision; |
| 23 | use LambdaTwelve\OneRecord\Server\Spi\StoredObject; |
| 24 | use LambdaTwelve\OneRecord\Vocabulary\Generated\Api; |
| 25 | use Psr\Http\Message\ServerRequestInterface; |
| 26 | |
| 27 | /** |
| 28 | * What endpoints share: resolving an object id to a stored object under the |
| 29 | * access policy, writing an object with its revision properties and headers, |
| 30 | * reading the spec's timestamps and query parameters. |
| 31 | */ |
| 32 | abstract class AbstractEndpoint implements Endpoint |
| 33 | { |
| 34 | public function __construct(protected readonly Services $services) {} |
| 35 | |
| 36 | /** |
| 37 | * The stored object (latest, or at a revision or time), after the policy |
| 38 | * allowed $action on it. A hidden or missing object is a 404; a forbidden |
| 39 | * one a 403. Both use the same body shape so nothing leaks. |
| 40 | */ |
| 41 | protected function requireObject(string $id, Agent $agent, Action $action, ?int $revision = null, ?DateTimeImmutable $at = null): StoredObject |
| 42 | { |
| 43 | $iri = $this->services->config->logisticsObjectIri($id); |
| 44 | $decision = $this->services->policy->decide($agent, $action, $iri); |
| 45 | if ($decision === Decision::Hide) { |
| 46 | throw HttpException::notFound('Logistics Object', $iri->value); |
| 47 | } |
| 48 | $stored = match (true) { |
| 49 | $revision !== null => $this->services->objects->revision($iri, $revision), |
| 50 | $at !== null => $this->services->objects->at($iri, $at), |
| 51 | default => $this->services->objects->latest($iri), |
| 52 | }; |
| 53 | if ($stored === null) { |
| 54 | if ($decision === Decision::Forbid && $this->services->objects->exists($iri)) { |
| 55 | throw HttpException::forbidden($iri->value); |
| 56 | } |
| 57 | throw HttpException::notFound('Logistics Object', $iri->value); |
| 58 | } |
| 59 | if ($decision === Decision::Forbid) { |
| 60 | throw HttpException::forbidden($iri->value); |
| 61 | } |
| 62 | |
| 63 | return $stored; |
| 64 | } |
| 65 | |
| 66 | protected function decide(Agent $agent, Action $action, ?Iri $resource): void |
| 67 | { |
| 68 | $decision = $this->services->policy->decide($agent, $action, $resource); |
| 69 | if ($decision === Decision::Hide) { |
| 70 | throw HttpException::notFound('The requested resource', $resource?->value); |
| 71 | } |
| 72 | if ($decision === Decision::Forbid) { |
| 73 | throw HttpException::forbidden($resource?->value); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * @return array<string, string> |
| 79 | */ |
| 80 | protected function objectHeaders(StoredObject $stored, ?string $location = null): array |
| 81 | { |
| 82 | $type = $stored->object->mostSpecificType($this->services->vocabulary); |
| 83 | $headers = [ |
| 84 | 'Revision' => (string) $stored->revision, |
| 85 | 'Latest-Revision' => (string) $stored->latestRevision, |
| 86 | 'Last-Modified' => Responder::httpDate($stored->lastModified), |
| 87 | 'Location' => $location ?? $stored->object->iri->value, |
| 88 | ]; |
| 89 | if ($type !== null) { |
| 90 | $headers['Type'] = $type; |
| 91 | } |
| 92 | |
| 93 | return $headers; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * The object as JSON-LD with api:hasRevision and api:hasLatestRevision, |
| 98 | * optionally with linked objects on this server embedded (?embedded=true) |
| 99 | * and, for a historical read, every local link carrying the same ?at=. |
| 100 | * |
| 101 | * @return array<string, mixed> |
| 102 | */ |
| 103 | protected function writeObject(StoredObject $stored, Agent $agent, bool $embedded, ?string $atParameter): array |
| 104 | { |
| 105 | $graph = new Graph($stored->object->graph); |
| 106 | $root = $stored->object->iri; |
| 107 | $this->addRevisions($graph, $root, $stored); |
| 108 | if ($embedded) { |
| 109 | $this->embedLinked($graph, $root, $agent, $atParameter, $this->services->config->embeddedDepth, [$root->value => true]); |
| 110 | } |
| 111 | if ($atParameter !== null) { |
| 112 | // The document is about the object at that time: its @id and every local link carry the same ?at=. |
| 113 | $historicalRoot = new Iri($root->value . '?at=' . $atParameter); |
| 114 | $graph = $this->rewriteLocalLinks($graph, $atParameter, $root, $historicalRoot); |
| 115 | $root = $historicalRoot; |
| 116 | } |
| 117 | $context = Context::oneRecord(); |
| 118 | |
| 119 | return (new Writer())->write($graph, $root, $context); |
| 120 | } |
| 121 | |
| 122 | private function addRevisions(Graph $graph, Iri $subject, StoredObject $stored): void |
| 123 | { |
| 124 | $graph->add(new Triple($subject, new Iri(Api::hasRevision), Literal::integer($stored->revision))); |
| 125 | $graph->add(new Triple($subject, new Iri(Api::hasLatestRevision), Literal::integer($stored->latestRevision))); |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * @param array<string, true> $seen |
| 130 | */ |
| 131 | private function embedLinked(Graph $graph, Iri $node, Agent $agent, ?string $atParameter, int $depth, array $seen): void |
| 132 | { |
| 133 | if ($depth <= 0) { |
| 134 | return; |
| 135 | } |
| 136 | foreach ($graph->about($node) as $triple) { |
| 137 | $object = $triple->object; |
| 138 | if (!$object instanceof Iri || isset($seen[$object->value]) || LogisticsObject::isEmbeddedIn($graph, $object, $node)) { |
| 139 | continue; |
| 140 | } |
| 141 | $relative = $this->services->config->relativePath($object); |
| 142 | if ($relative === null || preg_match('#^logistics-objects/[^/]+$#', $relative) !== 1) { |
| 143 | continue; |
| 144 | } |
| 145 | // Only objects the caller may read are embedded; others stay links, exactly as a direct GET would answer. |
| 146 | if (!$this->services->policy->decide($agent, Action::ReadLogisticsObject, $object)->allowed()) { |
| 147 | continue; |
| 148 | } |
| 149 | $linked = $atParameter !== null |
| 150 | ? $this->services->objects->at($object, self::parseAt($atParameter)) |
| 151 | : $this->services->objects->latest($object); |
| 152 | if ($linked === null) { |
| 153 | continue; |
| 154 | } |
| 155 | $seen[$object->value] = true; |
| 156 | foreach ($linked->object->graph as $t) { |
| 157 | $graph->add($t); |
| 158 | } |
| 159 | $this->addRevisions($graph, $object, $linked); |
| 160 | $this->embedLinked($graph, $object, $agent, $atParameter, $depth - 1, $seen); |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Links to objects on this server carry the same ?at= so a client following |
| 166 | * them stays at one point in time (spec: "Retrieve a historical Logistics Object"). |
| 167 | */ |
| 168 | private function rewriteLocalLinks(Graph $graph, string $atParameter, Iri $root, Iri $historicalRoot): Graph |
| 169 | { |
| 170 | // A link to another object of this server gets the same ?at=, whether it is bare or typed |
| 171 | // ({"@id", "@type"}); only an object embedded with its data (?embedded=true) keeps its own |
| 172 | // identity, because its triples are already the historical ones (AR-018). |
| 173 | $links = []; |
| 174 | foreach ($graph as $triple) { |
| 175 | $object = $triple->object; |
| 176 | if (!$object instanceof Iri || $object->equals($root) || LogisticsObject::isEmbeddedIn($graph, $object, $root)) { |
| 177 | continue; |
| 178 | } |
| 179 | $relative = $this->services->config->relativePath($object); |
| 180 | if ($relative === null || preg_match('#^logistics-objects/[^/]+$#', $relative) !== 1) { |
| 181 | continue; |
| 182 | } |
| 183 | $onlyTypes = array_filter($graph->about($object), static fn(Triple $t): bool => $t->predicate->value !== Graph::RDF_TYPE) === []; |
| 184 | if ($onlyTypes) { |
| 185 | $links[$object->value] = new Iri($object->value . '?at=' . $atParameter); |
| 186 | } |
| 187 | } |
| 188 | $rewritten = new Graph(); |
| 189 | foreach ($graph as $triple) { |
| 190 | $subject = $triple->subject->equals($root) ? $historicalRoot : ($triple->subject instanceof Iri ? ($links[$triple->subject->value] ?? $triple->subject) : $triple->subject); |
| 191 | $object = $triple->object; |
| 192 | if ($object->equals($root)) { |
| 193 | $object = $historicalRoot; |
| 194 | } elseif ($object instanceof Iri && isset($links[$object->value])) { |
| 195 | $object = $links[$object->value]; |
| 196 | } |
| 197 | $rewritten->add(new Triple($subject, $triple->predicate, $object)); |
| 198 | } |
| 199 | |
| 200 | return $rewritten; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * The spec's query timestamps: YYYYMMDDThhmmssZ, with RFC 3339 accepted too. |
| 205 | */ |
| 206 | public static function parseAt(string $value): DateTimeImmutable |
| 207 | { |
| 208 | $trimmed = trim($value); |
| 209 | $parsed = null; |
| 210 | try { |
| 211 | if (preg_match('/^(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})(\d{2})Z$/', $trimmed, $m) === 1) { |
| 212 | $parsed = checkdate((int) $m[2], (int) $m[3], (int) $m[1]) && (int) $m[4] < 24 && (int) $m[5] < 60 && (int) $m[6] < 61 |
| 213 | ? DateTimeImmutable::createFromFormat('!Y-m-d\TH:i:sP', \sprintf('%s-%s-%sT%s:%s:%s+00:00', $m[1], $m[2], $m[3], $m[4], $m[5], $m[6])) |
| 214 | : false; |
| 215 | } elseif (preg_match('/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[+-]\d{2}:\d{2})$/', $trimmed) === 1) { |
| 216 | $parsed = \LambdaTwelve\OneRecord\JsonLd\Nodes::parseDateTime($trimmed); |
| 217 | } |
| 218 | } catch (Exception) { |
| 219 | // PHP's date constructor throws on values the regex let through (a 99th month); that is a 400, not a 500 (AR-023). |
| 220 | $parsed = null; |
| 221 | } |
| 222 | if ($parsed === false || $parsed === null) { |
| 223 | throw HttpException::invalidQuery(\sprintf('"%s" is not a timestamp in the form YYYYMMDDThhmmssZ.', $trimmed), 'at'); |
| 224 | } |
| 225 | |
| 226 | return $parsed; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * @return array<string, string> |
| 231 | */ |
| 232 | protected static function query(ServerRequestInterface $request): array |
| 233 | { |
| 234 | $out = []; |
| 235 | foreach ($request->getQueryParams() as $key => $value) { |
| 236 | if (\is_string($value)) { |
| 237 | $out[(string) $key] = $value; |
| 238 | } elseif (\is_array($value)) { |
| 239 | $out[(string) $key] = implode(',', array_filter($value, is_string(...))); |
| 240 | } |
| 241 | } |
| 242 | if ($out === [] && $request->getUri()->getQuery() !== '') { |
| 243 | parse_str($request->getUri()->getQuery(), $parsed); |
| 244 | foreach ($parsed as $key => $value) { |
| 245 | if (\is_string($value)) { |
| 246 | $out[(string) $key] = $value; |
| 247 | } |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | return $out; |
| 252 | } |
| 253 | |
| 254 | protected static function isHead(ServerRequestInterface $request): bool |
| 255 | { |
| 256 | return strtoupper($request->getMethod()) === 'HEAD'; |
| 257 | } |
| 258 | |
| 259 | protected function negotiatedOrDefault(Negotiated $negotiated): Negotiated |
| 260 | { |
| 261 | return $negotiated; |
| 262 | } |
| 263 | } |