friendica/src/Module/Objects.php

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<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
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*/
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namespace Friendica\Module;
use Friendica\BaseModule;
use Friendica\Core\System;
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use Friendica\Database\DBA;
use Friendica\DI;
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use Friendica\Model\Contact;
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use Friendica\Model\Item;
use Friendica\Network\HTTPException;
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use Friendica\Protocol\ActivityPub;
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use Friendica\Util\HTTPSignature;
use Friendica\Util\Network;
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/**
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* ActivityPub Objects
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*/
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class Objects extends BaseModule
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{
public static function rawContent(array $parameters = [])
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{
if (empty($parameters['guid'])) {
throw new HTTPException\BadRequestException();
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}
if (!ActivityPub::isRequest()) {
DI::baseUrl()->redirect(str_replace('objects/', 'display/', DI::args()->getQueryString()));
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}
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$item = Item::selectFirst(['id', 'uid', 'origin', 'author-link', 'changed', 'private', 'psid'],
['guid' => $parameters['guid']], ['order' => ['origin' => true]]);
if (!DBA::isResult($item)) {
throw new HTTPException\NotFoundException();
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}
$validated = in_array($item['private'], [Item::PUBLIC, Item::UNLISTED]);
if (!$validated) {
$requester = HTTPSignature::getSigner('', $_SERVER);
if (!empty($requester) && $item['origin']) {
$requester_id = Contact::getIdForURL($requester, $item['uid']);
if (!empty($requester_id)) {
$permissionSets = DI::permissionSet()->selectByContactId($requester_id, $item['uid']);
if (!empty($permissionSets)) {
$psid = array_merge($permissionSets->column('id'),
[DI::permissionSet()->getIdFromACL($item['uid'], '', '', '', '')]);
$validated = in_array($item['psid'], $psid);
}
}
}
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}
// Valid items are original post or posted from this node (including in the case of a forum)
if (!$validated || !$item['origin'] && (parse_url($item['author-link'], PHP_URL_HOST) != parse_url(DI::baseUrl()->get(), PHP_URL_HOST))) {
throw new HTTPException\NotFoundException();
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}
$etag = md5($parameters['guid'] . '-' . $item['changed']);
$last_modified = $item['changed'];
Network::checkEtagModified($etag, $last_modified);
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if (empty($parameters['activity'])) {
$activity = ActivityPub\Transmitter::createActivityFromItem($item['id'], true);
$activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
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// Only display "Create" activity objects here, no reshares or anything else
if (empty($activity['object']) || ($activity['type'] != 'Create')) {
throw new HTTPException\NotFoundException();
}
$data = ['@context' => ActivityPub::CONTEXT];
$data = array_merge($data, $activity['object']);
} elseif (in_array($parameters['activity'], ['Create', 'Announce', 'Update',
'Like', 'Dislike', 'Accept', 'Reject', 'TentativeAccept', 'Follow', 'Add'])) {
$data = ActivityPub\Transmitter::createActivityFromItem($item['id']);
if (empty($data)) {
throw new HTTPException\NotFoundException();
}
if ($parameters['activity'] != 'Create') {
$data['type'] = $parameters['activity'];
$data['id'] = str_replace('/Create', '/' . $parameters['activity'], $data['id']);
}
} else {
throw new HTTPException\NotFoundException();
}
// Relaxed CORS header for public items
header('Access-Control-Allow-Origin: *');
System::jsonExit($data, 'application/activity+json');
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}
}