forked from mirror/pixelfed
138 lines
3.5 KiB
PHP
138 lines
3.5 KiB
PHP
<?php
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namespace App\Services;
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use App\Util\ActivityPub\HttpSignature;
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use Cache;
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use Illuminate\Http\Client\ConnectionException;
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use Illuminate\Http\Client\RequestException;
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use Illuminate\Support\Facades\Http;
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class ActivityPubFetchService
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{
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const CACHE_KEY = 'pf:services:apfetchs:';
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public static function get($url, $validateUrl = true)
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{
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if (! self::validateUrl($url)) {
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return false;
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}
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$domain = parse_url($url, PHP_URL_HOST);
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if (! $domain) {
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return false;
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}
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$domainKey = base64_encode($domain);
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$urlKey = hash('sha256', $url);
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$key = self::CACHE_KEY.$domainKey.':'.$urlKey;
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return Cache::remember($key, 450, function () use ($url) {
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return self::fetchRequest($url);
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});
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}
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public static function validateUrl($url)
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{
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if (is_array($url)) {
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$url = $url[0];
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}
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$localhosts = [
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'127.0.0.1', 'localhost', '::1',
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];
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if (strtolower(mb_substr($url, 0, 8)) !== 'https://') {
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return false;
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}
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if (substr_count($url, '://') !== 1) {
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return false;
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}
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if (mb_substr($url, 0, 8) !== 'https://') {
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$url = 'https://'.substr($url, 8);
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}
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$valid = filter_var($url, FILTER_VALIDATE_URL);
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if (! $valid) {
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return false;
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}
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$host = parse_url($valid, PHP_URL_HOST);
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if (in_array($host, $localhosts)) {
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return false;
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}
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if (config('security.url.verify_dns')) {
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if (DomainService::hasValidDns($host) === false) {
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return false;
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}
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}
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if (app()->environment() === 'production') {
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$bannedInstances = InstanceService::getBannedDomains();
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if (in_array($host, $bannedInstances)) {
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return false;
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}
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}
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return $url;
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}
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public static function fetchRequest($url, $returnJsonFormat = false)
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{
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$baseHeaders = [
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'Accept' => 'application/activity+json',
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];
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$headers = HttpSignature::instanceActorSign($url, false, $baseHeaders, 'get');
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$headers['Accept'] = 'application/activity+json';
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$headers['User-Agent'] = 'PixelFedBot/1.0.0 (Pixelfed/'.config('pixelfed.version').'; +'.config('app.url').')';
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try {
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$res = Http::withOptions([
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'allow_redirects' => [
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'max' => 2,
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'protocols' => ['https'],
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]])
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->withHeaders($headers)
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->timeout(30)
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->connectTimeout(5)
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->retry(3, 500)
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->get($url);
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} catch (RequestException $e) {
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return;
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} catch (ConnectionException $e) {
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return;
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} catch (Exception $e) {
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return;
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}
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if (! $res->ok()) {
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return;
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}
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if (! $res->hasHeader('Content-Type')) {
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return;
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}
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$acceptedTypes = [
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'application/activity+json; charset=utf-8',
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'application/activity+json',
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'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
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];
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$contentType = $res->getHeader('Content-Type')[0];
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if (! $contentType) {
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return;
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}
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if (! in_array($contentType, $acceptedTypes)) {
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return;
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}
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return $returnJsonFormat ? $res->json() : $res->body();
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}
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}
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