147 lines
5.3 KiB
PHP
147 lines
5.3 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Module;
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use Friendica\BaseModule;
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use Friendica\Core\Logger;
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use Friendica\Core\System;
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use Friendica\Database\DBA;
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use Friendica\DI;
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use Friendica\Model\Contact;
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use Friendica\Model\Item;
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use Friendica\Model\Post;
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use Friendica\Network\HTTPException;
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use Friendica\Protocol\ActivityPub;
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use Friendica\Util\HTTPSignature;
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use Friendica\Util\Network;
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use Friendica\Util\Strings;
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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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{
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public static function rawContent(array $parameters = [])
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{
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if (empty($parameters['guid'])) {
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throw new HTTPException\BadRequestException();
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}
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if (!ActivityPub::isRequest()) {
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DI::baseUrl()->redirect(str_replace('objects/', 'display/', DI::args()->getQueryString()));
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}
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$itemuri = DBA::selectFirst('item-uri', ['id'], ['guid' => $parameters['guid']]);
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if (DBA::isResult($itemuri)) {
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Logger::info('Provided GUID found.', ['guid' => $parameters['guid'], 'uri-id' => $itemuri['id']]);
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} else {
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// The item URI does not always contain the GUID. This means that we have to search the URL instead
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$url = DI::baseUrl()->get() . '/' . DI::args()->getQueryString();
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$nurl = Strings::normaliseLink($url);
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$ssl_url = str_replace('http://', 'https://', $nurl);
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$itemuri = DBA::selectFirst('item-uri', ['guid', 'id'], ['uri' => [$url, $nurl, $ssl_url]]);
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if (DBA::isResult($itemuri)) {
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Logger::info('URL found.', ['url' => $url, 'guid' => $itemuri['guid'], 'uri-id' => $itemuri['id']]);
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} else {
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Logger::info('URL not found.', ['url' => $url]);
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throw new HTTPException\NotFoundException();
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}
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}
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$item = Post::selectFirst(['id', 'uid', 'origin', 'author-link', 'changed', 'private', 'psid', 'gravity', 'deleted', 'parent-uri-id'],
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['uri-id' => $itemuri['id']], ['order' => ['origin' => true]]);
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if (!DBA::isResult($item)) {
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throw new HTTPException\NotFoundException();
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}
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$validated = in_array($item['private'], [Item::PUBLIC, Item::UNLISTED]);
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if (!$validated) {
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$requester = HTTPSignature::getSigner('', $_SERVER);
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if (!empty($requester) && $item['origin']) {
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$requester_id = Contact::getIdForURL($requester, $item['uid']);
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if (!empty($requester_id)) {
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$permissionSets = DI::permissionSet()->selectByContactId($requester_id, $item['uid']);
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if (!empty($permissionSets)) {
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$psid = array_merge($permissionSets->column('id'),
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[DI::permissionSet()->getIdFromACL($item['uid'], '', '', '', '')]);
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$validated = in_array($item['psid'], $psid);
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}
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}
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}
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}
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if ($validated) {
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// Valid items are original post or posted from this node (including in the case of a forum)
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$validated = ($item['origin'] || (parse_url($item['author-link'], PHP_URL_HOST) == parse_url(DI::baseUrl()->get(), PHP_URL_HOST)));
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if (!$validated && $item['deleted']) {
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$validated = Post::exists(['origin' => true, 'uri-id' => $item['parent-uri-id']]);
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}
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}
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if (!$validated) {
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throw new HTTPException\NotFoundException();
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}
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$etag = md5($parameters['guid'] . '-' . $item['changed']);
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$last_modified = $item['changed'];
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Network::checkEtagModified($etag, $last_modified);
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if (empty($parameters['activity']) && ($item['gravity'] != GRAVITY_ACTIVITY)) {
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$activity = ActivityPub\Transmitter::createActivityFromItem($item['id'], true);
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if (empty($activity['type'])) {
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throw new HTTPException\NotFoundException();
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}
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$activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
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// Only display "Create" activity objects here, no reshares or anything else
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if (empty($activity['object']) || ($activity['type'] != 'Create')) {
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throw new HTTPException\NotFoundException();
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}
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$data = ['@context' => ActivityPub::CONTEXT];
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$data = array_merge($data, $activity['object']);
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} elseif (empty($parameters['activity']) || in_array($parameters['activity'],
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['Create', 'Announce', 'Update', 'Like', 'Dislike', 'Accept', 'Reject',
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'TentativeAccept', 'Follow', 'Add'])) {
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$data = ActivityPub\Transmitter::createActivityFromItem($item['id']);
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if (empty($data)) {
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throw new HTTPException\NotFoundException();
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}
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if (!empty($parameters['activity']) && ($parameters['activity'] != 'Create')) {
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$data['type'] = $parameters['activity'];
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$data['id'] = str_replace('/Create', '/' . $parameters['activity'], $data['id']);
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}
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} else {
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throw new HTTPException\NotFoundException();
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}
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// Relaxed CORS header for public items
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header('Access-Control-Allow-Origin: *');
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System::jsonExit($data, 'application/activity+json');
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}
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}
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