pixelfed/app/Util/ActivityPub/Helpers.php

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<?php
namespace App\Util\ActivityPub;
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use DB, Cache, Purify, Storage, Request, Validator;
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use App\{
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Activity,
Follower,
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Instance,
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Like,
Media,
Notification,
Profile,
Status
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};
use Zttp\Zttp;
use Carbon\Carbon;
use GuzzleHttp\Client;
use Illuminate\Http\File;
use Illuminate\Validation\Rule;
use App\Jobs\AvatarPipeline\CreateAvatar;
use App\Jobs\RemoteFollowPipeline\RemoteFollowImportRecent;
use App\Jobs\ImageOptimizePipeline\{ImageOptimize,ImageThumbnail};
use App\Jobs\StatusPipeline\NewStatusPipeline;
use App\Jobs\StatusPipeline\StatusReplyPipeline;
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use App\Jobs\StatusPipeline\StatusTagsPipeline;
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use App\Util\ActivityPub\HttpSignature;
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use Illuminate\Support\Str;
use App\Services\ActivityPubFetchService;
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use App\Services\ActivityPubDeliveryService;
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use App\Services\CustomEmojiService;
use App\Services\InstanceService;
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use App\Services\MediaPathService;
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use App\Services\MediaStorageService;
use App\Jobs\MediaPipeline\MediaStoragePipeline;
use App\Jobs\AvatarPipeline\RemoteAvatarFetch;
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use App\Util\Media\License;
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use App\Models\Poll;
use Illuminate\Contracts\Cache\LockTimeoutException;
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class Helpers {
public static function validateObject($data)
{
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$verbs = ['Create', 'Announce', 'Like', 'Follow', 'Delete', 'Accept', 'Reject', 'Undo', 'Tombstone'];
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$valid = Validator::make($data, [
'type' => [
'required',
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'string',
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Rule::in($verbs)
],
'id' => 'required|string',
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'actor' => 'required|string|url',
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'object' => 'required',
'object.type' => 'required_if:type,Create',
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'object.attributedTo' => 'required_if:type,Create|url',
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'published' => 'required_if:type,Create|date'
])->passes();
return $valid;
}
public static function verifyAttachments($data)
{
if(!isset($data['object']) || empty($data['object'])) {
$data = ['object'=>$data];
}
$activity = $data['object'];
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$mimeTypes = explode(',', config_cache('pixelfed.media_types'));
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$mediaTypes = in_array('video/mp4', $mimeTypes) ? ['Document', 'Image', 'Video'] : ['Document', 'Image'];
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// Peertube
// $mediaTypes = in_array('video/mp4', $mimeTypes) ? ['Document', 'Image', 'Video', 'Link'] : ['Document', 'Image'];
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if(!isset($activity['attachment']) || empty($activity['attachment'])) {
return false;
}
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// peertube
// $attachment = is_array($activity['url']) ?
// collect($activity['url'])
// ->filter(function($media) {
// return $media['type'] == 'Link' && $media['mediaType'] == 'video/mp4';
// })
// ->take(1)
// ->values()
// ->toArray()[0] : $activity['attachment'];
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$attachment = $activity['attachment'];
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$valid = Validator::make($attachment, [
'*.type' => [
'required',
'string',
Rule::in($mediaTypes)
],
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'*.url' => 'required|url|max:255',
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'*.mediaType' => [
'required',
'string',
Rule::in($mimeTypes)
],
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'*.name' => 'sometimes|nullable|string|max:255'
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])->passes();
return $valid;
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}
public static function normalizeAudience($data, $localOnly = true)
{
if(!isset($data['to'])) {
return;
}
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$audience = [];
$audience['to'] = [];
$audience['cc'] = [];
$scope = 'private';
if(is_array($data['to']) && !empty($data['to'])) {
foreach ($data['to'] as $to) {
if($to == 'https://www.w3.org/ns/activitystreams#Public') {
$scope = 'public';
continue;
}
$url = $localOnly ? self::validateLocalUrl($to) : self::validateUrl($to);
if($url != false) {
array_push($audience['to'], $url);
}
}
}
if(is_array($data['cc']) && !empty($data['cc'])) {
foreach ($data['cc'] as $cc) {
if($cc == 'https://www.w3.org/ns/activitystreams#Public') {
$scope = 'unlisted';
continue;
}
$url = $localOnly ? self::validateLocalUrl($cc) : self::validateUrl($cc);
if($url != false) {
array_push($audience['cc'], $url);
}
}
}
$audience['scope'] = $scope;
return $audience;
}
public static function userInAudience($profile, $data)
{
$audience = self::normalizeAudience($data);
$url = $profile->permalink();
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return in_array($url, $audience['to']) || in_array($url, $audience['cc']);
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}
public static function validateUrl($url)
{
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if(is_array($url)) {
$url = $url[0];
}
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$hash = hash('sha256', $url);
$key = "helpers:url:valid:sha256-{$hash}";
$ttl = now()->addMinutes(5);
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$valid = Cache::remember($key, $ttl, function() use($url) {
$localhosts = [
'127.0.0.1', 'localhost', '::1'
];
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if(mb_substr($url, 0, 8) !== 'https://') {
return false;
}
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$valid = filter_var($url, FILTER_VALIDATE_URL);
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if(!$valid) {
return false;
}
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$host = parse_url($valid, PHP_URL_HOST);
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// if(count(dns_get_record($host, DNS_A | DNS_AAAA)) == 0) {
// return false;
// }
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if(config('costar.enabled') == true) {
if(
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(config('costar.domain.block') != null && Str::contains($host, config('costar.domain.block')) == true) ||
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(config('costar.actor.block') != null && in_array($url, config('costar.actor.block')) == true)
) {
return false;
}
}
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if(app()->environment() === 'production') {
$bannedInstances = InstanceService::getBannedDomains();
if(in_array($host, $bannedInstances)) {
return false;
}
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}
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if(in_array($host, $localhosts)) {
return false;
}
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return $url;
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});
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return $valid;
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}
public static function validateLocalUrl($url)
{
$url = self::validateUrl($url);
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if($url == true) {
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$domain = config('pixelfed.domain.app');
$host = parse_url($url, PHP_URL_HOST);
$url = $domain === $host ? $url : false;
return $url;
}
return false;
}
public static function zttpUserAgent()
{
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$version = config('pixelfed.version');
$url = config('app.url');
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return [
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'Accept' => 'application/activity+json',
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'User-Agent' => "(Pixelfed/{$version}; +{$url})",
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];
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}
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public static function fetchFromUrl($url = false)
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{
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if(self::validateUrl($url) == false) {
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return;
}
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$hash = hash('sha256', $url);
$key = "helpers:url:fetcher:sha256-{$hash}";
$ttl = now()->addMinutes(5);
return Cache::remember($key, $ttl, function() use($url) {
$res = ActivityPubFetchService::get($url);
$res = json_decode($res, true, 8);
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if(json_last_error() == JSON_ERROR_NONE) {
return $res;
} else {
return false;
}
});
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}
public static function fetchProfileFromUrl($url)
{
return self::fetchFromUrl($url);
}
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public static function pluckval($val)
{
if(is_string($val)) {
return $val;
}
if(is_array($val)) {
return !empty($val) ? $val[0] : null;
}
return null;
}
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public static function statusFirstOrFetch($url, $replyTo = false)
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{
$url = self::validateUrl($url);
if($url == false) {
return;
}
$host = parse_url($url, PHP_URL_HOST);
$local = config('pixelfed.domain.app') == $host ? true : false;
if($local) {
$id = (int) last(explode('/', $url));
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return Status::whereNotIn('scope', ['draft','archived'])->findOrFail($id);
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}
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$cached = Status::whereNotIn('scope', ['draft','archived'])
->whereUri($url)
->orWhere('object_url', $url)
->first();
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if($cached) {
return $cached;
}
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$res = self::fetchFromUrl($url);
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if(!$res || empty($res) || isset($res['error']) || !isset($res['@context']) ) {
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return;
}
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if(isset($res['object'])) {
$activity = $res;
} else {
$activity = ['object' => $res];
}
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$scope = 'private';
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$cw = isset($res['sensitive']) ? (bool) $res['sensitive'] : false;
if(isset($res['to']) == true) {
if(is_array($res['to']) && in_array('https://www.w3.org/ns/activitystreams#Public', $res['to'])) {
$scope = 'public';
}
if(is_string($res['to']) && 'https://www.w3.org/ns/activitystreams#Public' == $res['to']) {
$scope = 'public';
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}
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}
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if(isset($res['cc']) == true) {
if(is_array($res['cc']) && in_array('https://www.w3.org/ns/activitystreams#Public', $res['cc'])) {
$scope = 'unlisted';
}
if(is_string($res['cc']) && 'https://www.w3.org/ns/activitystreams#Public' == $res['cc']) {
$scope = 'unlisted';
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}
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}
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if(config('costar.enabled') == true) {
$blockedKeywords = config('costar.keyword.block');
if($blockedKeywords !== null) {
$keywords = config('costar.keyword.block');
foreach($keywords as $kw) {
if(Str::contains($res['content'], $kw) == true) {
return;
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}
}
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}
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$unlisted = config('costar.domain.unlisted');
if(in_array(parse_url($url, PHP_URL_HOST), $unlisted) == true) {
$unlisted = true;
$scope = 'unlisted';
} else {
$unlisted = false;
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}
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$cwDomains = config('costar.domain.cw');
if(in_array(parse_url($url, PHP_URL_HOST), $cwDomains) == true) {
$cw = true;
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}
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}
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$id = isset($res['id']) ? self::pluckval($res['id']) : self::pluckval($url);
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$idDomain = parse_url($id, PHP_URL_HOST);
$urlDomain = parse_url($url, PHP_URL_HOST);
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if(!self::validateUrl($id)) {
return;
}
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$attributedTo = is_string($activity['object']['attributedTo']) ?
$activity['object']['attributedTo'] :
(is_array($activity['object']['attributedTo']) ?
collect($activity['object']['attributedTo'])
->filter(function($o) {
return $o && isset($o['type']) && $o['type'] == 'Person';
})
->pluck('id')
->first() : null
);
if($attributedTo) {
$actorDomain = parse_url($attributedTo, PHP_URL_HOST);
if(!self::validateUrl($attributedTo) ||
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$idDomain !== $actorDomain ||
$actorDomain !== $urlDomain
)
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{
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return;
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}
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}
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if($idDomain !== $urlDomain) {
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return;
}
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$profile = self::profileFirstOrNew($attributedTo);
if(isset($activity['object']['inReplyTo']) && !empty($activity['object']['inReplyTo']) || $replyTo == true) {
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$reply_to = self::statusFirstOrFetch(self::pluckval($activity['object']['inReplyTo']), false);
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$reply_to = optional($reply_to)->id;
} else {
$reply_to = null;
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}
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$ts = self::pluckval($res['published']);
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if($scope == 'public' && in_array($urlDomain, InstanceService::getUnlistedDomains())) {
$scope = 'unlisted';
}
if(in_array($urlDomain, InstanceService::getNsfwDomains())) {
$cw = true;
}
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$statusLockKey = 'helpers:status-lock:' . hash('sha256', $res['id']);
$status = Cache::lock($statusLockKey)
->get(function () use(
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$profile,
$res,
$url,
$ts,
$reply_to,
$cw,
$scope,
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$id
) {
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if($res['type'] === 'Question') {
$status = self::storePoll(
$profile,
$res,
$url,
$ts,
$reply_to,
$cw,
$scope,
$id
);
return $status;
}
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return self::storeStatus($url, $profile, $res);
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});
return $status;
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}
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public static function storeStatus($url, $profile, $activity)
{
$id = isset($activity['id']) ? self::pluckval($activity['id']) : self::pluckval($activity['url']);
$url = isset($activity['url']) && is_string($activity['url']) ? $activity['url'] : $id;
$idDomain = parse_url($id, PHP_URL_HOST);
$urlDomain = parse_url($url, PHP_URL_HOST);
if(!self::validateUrl($id) || !self::validateUrl($url)) {
return;
}
$reply_to = self::getReplyTo($activity);
return DB::transaction(function() use($url, $profile, $activity, $reply_to, $id) {
$ts = self::pluckval($activity['published']);
$scope = self::getScope($activity, $url);
$cw = self::getSensitive($activity, $url);
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$pid = is_object($profile) ? $profile->id : (is_array($profile) ? $profile['id'] : null);
if(!$pid) {
return;
}
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$status = new Status;
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$status->profile_id = $pid;
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$status->url = $url;
$status->uri = $url;
$status->object_url = $id;
$status->caption = strip_tags($activity['content']);
$status->rendered = Purify::clean($activity['content']);
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$status->created_at = Carbon::parse($ts)->tz('UTC');
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$status->in_reply_to_id = $reply_to;
$status->local = false;
$status->is_nsfw = $cw;
$status->scope = $scope;
$status->visibility = $scope;
$status->cw_summary = $cw == true && isset($activity['summary']) ?
Purify::clean(strip_tags($activity['summary'])) : null;
$status->save();
if($reply_to == null) {
self::importNoteAttachment($activity, $status);
} else {
StatusReplyPipeline::dispatch($status);
}
if(isset($activity['tag']) && is_array($activity['tag']) && !empty($activity['tag'])) {
StatusTagsPipeline::dispatch($activity, $status);
}
return $status;
});
}
public static function getSensitive($activity, $url)
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{
$id = isset($activity['id']) ? self::pluckval($activity['id']) : self::pluckval($url);
$url = isset($activity['url']) ? self::pluckval($activity['url']) : $id;
$urlDomain = parse_url($url, PHP_URL_HOST);
$cw = isset($activity['sensitive']) ? (bool) $activity['sensitive'] : false;
if(in_array($urlDomain, InstanceService::getNsfwDomains())) {
$cw = true;
}
return $cw;
}
public static function getReplyTo($activity)
{
$reply_to = null;
$inReplyTo = isset($activity['inReplyTo']) && !empty($activity['inReplyTo']) ?
self::pluckval($activity['inReplyTo']) :
false;
if($inReplyTo) {
$reply_to = self::statusFirstOrFetch($inReplyTo);
if($reply_to) {
$reply_to = optional($reply_to)->id;
}
} else {
$reply_to = null;
}
return $reply_to;
}
public static function getScope($activity, $url)
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{
$id = isset($activity['id']) ? self::pluckval($activity['id']) : self::pluckval($url);
$url = isset($activity['url']) ? self::pluckval($activity['url']) : $id;
$urlDomain = parse_url($url, PHP_URL_HOST);
$scope = 'private';
if(isset($activity['to']) == true) {
if(is_array($activity['to']) && in_array('https://www.w3.org/ns/activitystreams#Public', $activity['to'])) {
$scope = 'public';
}
if(is_string($activity['to']) && 'https://www.w3.org/ns/activitystreams#Public' == $activity['to']) {
$scope = 'public';
}
}
if(isset($activity['cc']) == true) {
if(is_array($activity['cc']) && in_array('https://www.w3.org/ns/activitystreams#Public', $activity['cc'])) {
$scope = 'unlisted';
}
if(is_string($activity['cc']) && 'https://www.w3.org/ns/activitystreams#Public' == $activity['cc']) {
$scope = 'unlisted';
}
}
if($scope == 'public' && in_array($urlDomain, InstanceService::getUnlistedDomains())) {
$scope = 'unlisted';
}
return $scope;
}
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private static function storePoll($profile, $res, $url, $ts, $reply_to, $cw, $scope, $id)
{
if(!isset($res['endTime']) || !isset($res['oneOf']) || !is_array($res['oneOf']) || count($res['oneOf']) > 4) {
return;
}
$options = collect($res['oneOf'])->map(function($option) {
return $option['name'];
})->toArray();
$cachedTallies = collect($res['oneOf'])->map(function($option) {
return $option['replies']['totalItems'] ?? 0;
})->toArray();
$status = new Status;
$status->profile_id = $profile->id;
$status->url = isset($res['url']) ? $res['url'] : $url;
$status->uri = isset($res['url']) ? $res['url'] : $url;
$status->object_url = $id;
$status->caption = strip_tags($res['content']);
$status->rendered = Purify::clean($res['content']);
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$status->created_at = Carbon::parse($ts)->tz('UTC');
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$status->in_reply_to_id = null;
$status->local = false;
$status->is_nsfw = $cw;
$status->scope = 'draft';
$status->visibility = 'draft';
$status->cw_summary = $cw == true && isset($res['summary']) ?
Purify::clean(strip_tags($res['summary'])) : null;
$status->save();
$poll = new Poll;
$poll->status_id = $status->id;
$poll->profile_id = $status->profile_id;
$poll->poll_options = $options;
$poll->cached_tallies = $cachedTallies;
$poll->votes_count = array_sum($cachedTallies);
$poll->expires_at = now()->parse($res['endTime']);
$poll->last_fetched_at = now();
$poll->save();
$status->type = 'poll';
$status->scope = $scope;
$status->visibility = $scope;
$status->save();
return $status;
}
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public static function statusFetch($url)
{
return self::statusFirstOrFetch($url);
}
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public static function importNoteAttachment($data, Status $status)
{
if(self::verifyAttachments($data) == false) {
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// \Log::info('importNoteAttachment::failedVerification.', [$data['id']]);
$status->viewType();
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return;
}
$attachments = isset($data['object']) ? $data['object']['attachment'] : $data['attachment'];
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// peertube
// if(!$attachments) {
// $obj = isset($data['object']) ? $data['object'] : $data;
// $attachments = is_array($obj['url']) ? $obj['url'] : null;
// }
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$user = $status->profile;
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$storagePath = MediaPathService::get($user, 2);
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$allowed = explode(',', config_cache('pixelfed.media_types'));
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foreach($attachments as $media) {
$type = $media['mediaType'];
$url = $media['url'];
$blurhash = isset($media['blurhash']) ? $media['blurhash'] : null;
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$license = isset($media['license']) ? License::nameToId($media['license']) : null;
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$valid = self::validateUrl($url);
if(in_array($type, $allowed) == false || $valid == false) {
continue;
}
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$media = new Media();
$media->blurhash = $blurhash;
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$media->remote_media = true;
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$media->status_id = $status->id;
$media->profile_id = $status->profile_id;
$media->user_id = null;
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$media->media_path = $url;
$media->remote_url = $url;
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if($license) {
$media->license = $license;
}
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$media->mime = $type;
$media->version = 3;
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$media->save();
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if(config_cache('pixelfed.cloud_storage') == true) {
MediaStoragePipeline::dispatch($media);
}
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}
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$status->viewType();
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return;
}
public static function profileFirstOrNew($url)
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{
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$url = self::validateUrl($url);
if($url == false) {
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return;
}
$host = parse_url($url, PHP_URL_HOST);
$local = config('pixelfed.domain.app') == $host ? true : false;
if($local == true) {
$id = last(explode('/', $url));
return Profile::whereNull('status')
->whereNull('domain')
->whereUsername($id)
->firstOrFail();
}
if($profile = Profile::whereRemoteUrl($url)->first()) {
if($profile->last_fetched_at->lt(now()->subHours(24))) {
return self::profileUpdateOrCreate($url);
}
return $profile;
}
return self::profileUpdateOrCreate($url);
}
public static function profileUpdateOrCreate($url)
{
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$hash = base64_encode($url);
$key = 'ap:profile:by_url:' . $hash;
$lock = Cache::lock($key, 30);
$profile = null;
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try {
$lock->block(5);
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$res = self::fetchProfileFromUrl($url);
if(isset($res['id']) == false) {
return;
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}
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$domain = parse_url($res['id'], PHP_URL_HOST);
if(!isset($res['preferredUsername']) && !isset($res['nickname'])) {
return;
}
$username = (string) Purify::clean($res['preferredUsername'] ?? $res['nickname']);
if(empty($username)) {
return;
}
$remoteUsername = $username;
$webfinger = "@{$username}@{$domain}";
abort_if(!self::validateUrl($res['inbox']), 400);
abort_if(!self::validateUrl($res['id']), 400);
$profile = DB::transaction(function() use($domain, $webfinger, $res) {
$instance = Instance::updateOrCreate([
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'domain' => $domain
]);
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if($instance->wasRecentlyCreated == true) {
\App\Jobs\InstancePipeline\FetchNodeinfoPipeline::dispatch($instance)->onQueue('low');
}
$profile = Profile::updateOrCreate(
[
'domain' => strtolower($domain),
'username' => Purify::clean($webfinger),
'remote_url' => $res['id'],
],
[
'name' => isset($res['name']) ? Purify::clean($res['name']) : 'user',
'bio' => isset($res['summary']) ? Purify::clean($res['summary']) : null,
'sharedInbox' => isset($res['endpoints']) && isset($res['endpoints']['sharedInbox']) ? $res['endpoints']['sharedInbox'] : null,
'inbox_url' => $res['inbox'],
'outbox_url' => isset($res['outbox']) ? $res['outbox'] : null,
'public_key' => $res['publicKey']['publicKeyPem'],
'key_id' => $res['publicKey']['id'],
'webfinger' => Purify::clean($webfinger),
]
);
if( $profile->last_fetched_at == null ||
$profile->last_fetched_at->lt(now()->subHours(24))
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) {
RemoteAvatarFetch::dispatch($profile);
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}
$profile->last_fetched_at = now();
$profile->save();
return $profile;
});
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return $profile;
} catch (LockTimeoutException $e) {
} finally {
optional($lock)->release();
}
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return $profile;
}
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public static function profileFetch($url)
{
return self::profileFirstOrNew($url);
}
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public static function sendSignedObject($profile, $url, $body)
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{
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ActivityPubDeliveryService::queue()
->from($profile)
->to($url)
->payload($body)
->send();
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}
}