pixelfed/app/Services/WebfingerService.php

<?php

namespace App\Services;

use App\Profile;
use App\Util\ActivityPub\Helpers;
use App\Util\Webfinger\WebfingerUrl;
use Illuminate\Support\Facades\Http;

class WebfingerService
{
    public static function rawGet($url)
    {
        if (empty($url)) {
            return false;
        }

        $n = WebfingerUrl::get($url);

        if (! $n) {
            return false;
        }
        if (empty($n) || ! str_starts_with($n, 'https://')) {
            return false;
        }
        $host = parse_url($n, PHP_URL_HOST);
        if (! $host) {
            return false;
        }

        if (in_array($host, InstanceService::getBannedDomains())) {
            return false;
        }
        $webfinger = FetchCacheService::getJson($n);
        if (! $webfinger) {
            return false;
        }

        if (! isset($webfinger['links']) || ! is_array($webfinger['links']) || empty($webfinger['links'])) {
            return false;
        }
        $link = collect($webfinger['links'])
            ->filter(function ($link) {
                return $link &&
                    isset($link['rel'], $link['type'], $link['href']) &&
                    $link['rel'] === 'self' &&
                    in_array($link['type'], ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"']);
            })
            ->pluck('href')
            ->first();

        return $link;
    }

    public static function lookup($query, $mastodonMode = false)
    {
        return (new self)->run($query, $mastodonMode);
    }

    protected function run($query, $mastodonMode)
    {
        if ($profile = Profile::whereUsername($query)->first()) {
            return $mastodonMode ?
                AccountService::getMastodon($profile->id, true) :
                AccountService::get($profile->id);
        }
        $url = WebfingerUrl::generateWebfingerUrl($query);
        if (! Helpers::validateUrl($url)) {
            return [];
        }

        try {
            $res = Http::retry(3, 100)
                ->acceptJson()
                ->withHeaders([
                    'User-Agent' => '(Pixelfed/'.config('pixelfed.version').'; +'.config('app.url').')',
                ])
                ->timeout(20)
                ->get($url);
        } catch (\Illuminate\Http\Client\ConnectionException $e) {
            return [];
        }

        if (! $res->successful()) {
            return [];
        }

        $webfinger = $res->json();
        if (! isset($webfinger['links']) || ! is_array($webfinger['links']) || empty($webfinger['links'])) {
            return [];
        }

        $link = collect($webfinger['links'])
            ->filter(function ($link) {
                return $link &&
                    isset($link['rel'], $link['type'], $link['href']) &&
                    $link['rel'] === 'self' &&
                    in_array($link['type'], ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"']);
            })
            ->pluck('href')
            ->first();

        $profile = Helpers::profileFetch($link);
        if (! $profile) {
            return;
        }

        return $mastodonMode ?
            AccountService::getMastodon($profile->id, true) :
            AccountService::get($profile->id);
    }
}