Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @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/>.
*
*/
namespace Friendica\Protocol;
use Friendica\Content\Text\BBCode;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\APContact;
use Friendica\Model\Contact;
use Friendica\Model\GServer;
use Friendica\Model\Post;
use Friendica\Model\Search;
use Friendica\Model\Tag;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Strings;
/**
* Base class for relay handling
*/
class Relay
{
/**
* Check if a post is wanted
*
* @param array $tags
* @param string $body
* @param int $authorid
* @param string $url
* @return boolean "true" is the post is wanted by the system
*/
public static function isSolicitedPost(array $tags, string $body, int $authorid, string $url, string $network = '')
{
$config = DI::config();
$scope = $config->get('system', 'relay_scope');
if ($scope == SR_SCOPE_NONE) {
Logger::info('Server does not accept relay posts - rejected', ['network' => $network, 'url' => $url]);
return false;
}
if (Contact::isBlocked($authorid)) {
Logger::info('Author is blocked - rejected', ['author' => $authorid, 'network' => $network, 'url' => $url]);
return false;
}
if (Contact::isHidden($authorid)) {
Logger::info('Author is hidden - rejected', ['author' => $authorid, 'network' => $network, 'url' => $url]);
return false;
}
$systemTags = [];
$userTags = [];
$denyTags = [];
if ($scope == SR_SCOPE_TAGS) {
$server_tags = $config->get('system', 'relay_server_tags');
$tagitems = explode(',', mb_strtolower($server_tags));
foreach ($tagitems AS $tag) {
$systemTags[] = trim($tag, '# ');
}
if ($config->get('system', 'relay_user_tags')) {
$userTags = Search::getUserTags();
}
}
$tagList = array_unique(array_merge($systemTags, $userTags));
$deny_tags = $config->get('system', 'relay_deny_tags');
$tagitems = explode(',', mb_strtolower($deny_tags));
foreach ($tagitems AS $tag) {
$tag = trim($tag, '# ');
$denyTags[] = $tag;
}
if (!empty($tagList) || !empty($denyTags)) {
$content = mb_strtolower(BBCode::toPlaintext($body, false));
foreach ($tags as $tag) {
$tag = mb_strtolower($tag);
if (in_array($tag, $denyTags)) {
Logger::info('Unwanted hashtag found - rejected', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
return false;
}
if (in_array($tag, $tagList)) {
Logger::info('Subscribed hashtag found - accepted', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
return true;
}
// We check with "strpos" for performance issues. Only when this is true, the regular expression check is used
// RegExp is taken from here: https://medium.com/@shiba1014/regex-word-boundaries-with-unicode-207794f6e7ed
if ((strpos($content, $tag) !== false) && preg_match('/(?<=[\s,.:;"\']|^)' . preg_quote($tag, '/') . '(?=[\s,.:;"\']|$)/', $content)) {
Logger::info('Subscribed hashtag found in content - accepted', ['hashtag' => $tag, 'network' => $network, 'url' => $url]);
return true;
}
}
}
if ($scope == SR_SCOPE_ALL) {
Logger::info('Server accept all posts - accepted', ['network' => $network, 'url' => $url]);
return true;
}
Logger::info('No matching hashtags found - rejected', ['network' => $network, 'url' => $url]);
return false;
}
/**
* Update or insert a relay contact
*
* @param array $gserver Global server record
* @param array $fields Optional network specific fields
* @throws \Exception
*/
public static function updateContact(array $gserver, array $fields = [])
{
if (in_array($gserver['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
$system = APContact::getByURL($gserver['url'] . '/friendica');
if (!empty($system['sharedinbox'])) {
Logger::info('Sucessfully probed for relay contact', ['server' => $gserver['url']]);
$id = Contact::updateFromProbeByURL($system['url']);
Logger::info('Updated relay contact', ['server' => $gserver['url'], 'id' => $id]);
return;
}
}
$condition = ['uid' => 0, 'gsid' => $gserver['id'], 'contact-type' => Contact::TYPE_RELAY];
$old = DBA::selectFirst('contact', [], $condition);
if (!DBA::isResult($old)) {
$condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($gserver['url'])];
$old = DBA::selectFirst('contact', [], $condition);
if (DBA::isResult($old)) {
$fields['gsid'] = $gserver['id'];
$fields['contact-type'] = Contact::TYPE_RELAY;
Logger::info('Assigning missing data for relay contact', ['server' => $gserver['url'], 'id' => $old['id']]);
}
} elseif (empty($fields)) {
Logger::info('No content to update, quitting', ['server' => $gserver['url']]);
return;
}
if (DBA::isResult($old)) {
$fields['updated'] = DateTimeFormat::utcNow();
Logger::info('Update relay contact', ['server' => $gserver['url'], 'id' => $old['id'], 'fields' => $fields]);
DBA::update('contact', $fields, ['id' => $old['id']], $old);
} else {
$default = ['created' => DateTimeFormat::utcNow(),
'name' => 'relay', 'nick' => 'relay', 'url' => $gserver['url'],
'nurl' => Strings::normaliseLink($gserver['url']),
'network' => Protocol::DIASPORA, 'uid' => 0,
'batch' => $gserver['url'] . '/receive/public',
'rel' => Contact::FOLLOWER, 'blocked' => false,
'pending' => false, 'writable' => true,
'gsid' => $gserver['id'],
'baseurl' => $gserver['url'], 'contact-type' => Contact::TYPE_RELAY];
$fields = array_merge($default, $fields);
Logger::info('Create relay contact', ['server' => $gserver['url'], 'fields' => $fields]);
Contact::insert($fields);
}
}
/**
* Mark the relay contact of the given contact for archival
* This is called whenever there is a communication issue with the server.
* It avoids sending stuff to servers who don't exist anymore.
* The relay contact is a technical contact entry that exists once per server.
*
* @param array $contact of the relay contact
*/
public static function markForArchival(array $contact)
{
if (!empty($contact['contact-type']) && ($contact['contact-type'] == Contact::TYPE_RELAY)) {
// This is already the relay contact, we don't need to fetch it
$relay_contact = $contact;
} elseif (empty($contact['baseurl'])) {
if (!empty($contact['batch'])) {
$condition = ['uid' => 0, 'network' => Protocol::FEDERATED, 'batch' => $contact['batch'], 'contact-type' => Contact::TYPE_RELAY];
$relay_contact = DBA::selectFirst('contact', [], $condition);
} else {
return;
}
} else {
$gserver = ['id' => $contact['gsid'] ?: GServer::getID($contact['baseurl'], true),
'url' => $contact['baseurl'], 'network' => $contact['network']];
$relay_contact = self::getContact($gserver, []);
}
if (!empty($relay_contact)) {
Logger::info('Relay contact will be marked for archival', ['id' => $relay_contact['id'], 'url' => $relay_contact['url']]);
Contact::markForArchival($relay_contact);
}
}
/**
* Return a list of servers that we serve via the direct relay
*
* @param integer $item_id id of the item that is sent
* @param array $contacts Previously fetched contacts
* @param array $networks Networks of the relay servers
*
* @return array of relay servers
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function getDirectRelayList(int $item_id)
{
$serverlist = [];
if (!DI::config()->get("system", "relay_directly", false)) {
return [];
}
// We distribute our stuff based on the parent to ensure that the thread will be complete
$parent = Post::selectFirst(['uri-id'], ['id' => $item_id]);
if (!DBA::isResult($parent)) {
return [];
}
// Servers that want to get all content
$servers = DBA::select('gserver', ['id', 'url', 'network'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
while ($server = DBA::fetch($servers)) {
$serverlist[$server['id']] = $server;
}
DBA::close($servers);
// All tags of the current post
$tags = DBA::select('tag-view', ['name'], ['uri-id' => $parent['uri-id'], 'type' => Tag::HASHTAG]);
$taglist = [];
while ($tag = DBA::fetch($tags)) {
$taglist[] = $tag['name'];
}
DBA::close($tags);
// All servers who wants content with this tag
$tagserverlist = [];
if (!empty($taglist)) {
$tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
while ($server = DBA::fetch($tagserver)) {
$tagserverlist[] = $server['gserver-id'];
}
DBA::close($tagserver);
}
// All adresses with the given id
if (!empty($tagserverlist)) {
$servers = DBA::select('gserver', ['id', 'url', 'network'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
while ($server = DBA::fetch($servers)) {
$serverlist[$server['id']] = $server;
}
DBA::close($servers);
}
$contacts = [];
// Now we are collecting all relay contacts
foreach ($serverlist as $gserver) {
// We don't send messages to ourselves
if (Strings::compareLink($gserver['url'], DI::baseUrl())) {
continue;
}
$contact = self::getContact($gserver);
if (empty($contact)) {
continue;
}
}
return $contacts;
}
/**
* Return a list of relay servers
*
* @param array $fields Field list
* @return array
* @throws Exception
*/
public static function getList($fields = []):array
{
return DBA::selectToArray('apcontact', $fields,
["`type` = ? AND `url` IN (SELECT `url` FROM `contact` WHERE `uid` = ? AND `rel` = ?)", 'Application', 0, Contact::FRIEND]);
}
/**
* Return a contact for a given server address or creates a dummy entry
*
* @param array $gserver Global server record
* @param array $fields Fieldlist
* @return array with the contact
* @throws \Exception
*/
private static function getContact(array $gserver, array $fields = ['batch', 'id', 'url', 'name', 'network', 'protocol', 'archive', 'blocked'])
{
// Fetch the relay contact
$condition = ['uid' => 0, 'gsid' => $gserver['id'], 'contact-type' => Contact::TYPE_RELAY];
$contact = DBA::selectFirst('contact', $fields, $condition);
if (DBA::isResult($contact)) {
if ($contact['archive'] || $contact['blocked']) {
return false;
}
return $contact;
} else {
self::updateContact($gserver);
$contact = DBA::selectFirst('contact', $fields, $condition);
if (DBA::isResult($contact)) {
return $contact;
}
}
// It should never happen that we arrive here
return [];
}
}