pixelfed/pixelfed

<?php

namespace App\Services;

use Cache;
use App\Profile;
use Illuminate\Support\Str;
use Illuminate\Support\Facades\Http;
use App\Util\Webfinger\WebfingerUrl;

class AutolinkService
{
    const CACHE_KEY = 'pf:services:autolink:';

    public static function mentionedUsernameExists($username)
    {
        $key = 'pf:services:autolink:userexists:' . hash('sha256', $username);

        return Cache::remember($key, 3600, function() use($username) {
            $remote = Str::of($username)->contains('@');
            $profile = Profile::whereUsername($username)->first();
            if($profile) {
                if($profile->domain != null) {
                    $instance = InstanceService::getByDomain($profile->domain);
                    if($instance && $instance->banned == true) {
                        return false;
                    }
                }
                return true;
            } else {
                if($remote) {
                    $parts = explode('@', $username);
                    $domain = last($parts);
                    $instance = InstanceService::getByDomain($domain);

                    if($instance) {
                        if($instance->banned == true) {
                            return false;
                        } else {
                            $wf = WebfingerUrl::generateWebfingerUrl($username);
                            $res = Http::head($wf);
                            return $res->ok();
                        }
                    } else {
                        $wf = WebfingerUrl::generateWebfingerUrl($username);
                        $res = Http::head($wf);
                        return $res->ok();
                    }
                }
            }
            return false;
        });
    }
}