routes/lookup.php


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<?php

use Digitigrade\HttpResponseStatus\BadRequest;
use Digitigrade\HttpResponseStatus\NotFound;
use Digitigrade\HttpResponseStatus\TemporaryRedirect;
use Digitigrade\Model\Actor;
use Digitigrade\Model\Note;
use Digitigrade\Router;

Router::getInstance()->mount('/lookup', function (array $args) {
    if (!isset($_GET['uri'])) {
        throw new BadRequest('please provide a `uri` query parameter');
    }
    $uri = $_GET['uri'];
    if (!str_starts_with($uri, 'https://')) {
        throw new BadRequest('dodgy looking uri');
    }

    // try looking it up as a note
    try {
        $object = Note::findByUri($uri);
    } catch (\Throwable $ignored) {
    }

    // then as an actor
    if (!isset($object)) {
        try {
            $object = Actor::findByUri($uri);
        } catch (\Throwable $ignored) {
        }
    }

    if (!isset($object)) {
        throw new NotFound("i can't find any object with that uri, sorry!");
    }

    if ($object instanceof Note || $object instanceof Actor) {
        throw new TemporaryRedirect($object->getLocalUiHref());
    }
});