routes/webfinger.php


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<?php

use WpfTest\GlobalConfig;
use WpfTest\HttpReturnStatus\BadRequest;
use WpfTest\HttpReturnStatus\NotFound;
use WpfTest\Router;

Router::getInstance()->mount('/.well-known/webfinger', function (array $args) {
    if (!isset($_GET['resource'])) {
        throw new BadRequest('parameter `resource` is required');
    }
    $resource = $_GET['resource'];
    if (!str_starts_with($resource, 'acct:')) {
        throw new BadRequest('only acct: URIs are supported');
    }
    $handle = substr($resource, 5);
    [$localPart, $remotePart] = explode('@', $handle, 2);
    if ($remotePart != GlobalConfig::getInstance()->getCanonicalHost()) {
        throw new NotFound('i only know about local accounts');
    }
    if ($localPart != 'winter') {
        throw new NotFound('i only know about winter!!!');
    }
    json_response([
        'subject' => "acct:$localPart@$remotePart",
        'links' => [
            [
                'rel' => 'urn:example:wpf:actor',
                'href' => path_to_uri('/user/winter'),
                'type' => 'application/json'
            ]
        ]
    ]);
});