friendica/src/Model/APContact.php

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<?php
/**
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* @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/>.
*
*/
namespace Friendica\Model;
use Friendica\Content\Text\HTML;
use Friendica\Core\Cache\Duration;
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use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\DI;
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use Friendica\Network\Probe;
use Friendica\Protocol\ActivityNamespace;
use Friendica\Protocol\ActivityPub;
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use Friendica\Util\Crypto;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\JsonLD;
use Friendica\Util\Network;
class APContact
{
/**
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* Fetch webfinger data
*
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* @param string $addr Address
* @return array webfinger data
*/
private static function fetchWebfingerData(string $addr)
{
$addr_parts = explode('@', $addr);
if (count($addr_parts) != 2) {
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return [];
}
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$data = ['addr' => $addr];
$template = 'https://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
$webfinger = Probe::webfinger(str_replace('{uri}', urlencode($addr), $template), 'application/jrd+json');
if (empty($webfinger['links'])) {
$template = 'http://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
$webfinger = Probe::webfinger(str_replace('{uri}', urlencode($addr), $template), 'application/jrd+json');
if (empty($webfinger['links'])) {
return [];
}
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$data['baseurl'] = 'http://' . $addr_parts[1];
} else {
$data['baseurl'] = 'https://' . $addr_parts[1];
}
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foreach ($webfinger['links'] as $link) {
if (empty($link['rel'])) {
continue;
}
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if (!empty($link['template']) && ($link['rel'] == ActivityNamespace::OSTATUSSUB)) {
$data['subscribe'] = $link['template'];
}
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if (!empty($link['href']) && !empty($link['type']) && ($link['rel'] == 'self') && ($link['type'] == 'application/activity+json')) {
$data['url'] = $link['href'];
}
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if (!empty($link['href']) && !empty($link['type']) && ($link['rel'] == 'http://webfinger.net/rel/profile-page') && ($link['type'] == 'text/html')) {
$data['alias'] = $link['href'];
}
}
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if (!empty($data['url']) && !empty($data['alias']) && ($data['url'] == $data['alias'])) {
unset($data['alias']);
}
return $data;
}
/**
* Fetches a profile from a given url
*
* @param string $url profile url
* @param boolean $update true = always update, false = never update, null = update when not found or outdated
* @return array profile array
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
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public static function getByURL($url, $update = null)
{
if (empty($url)) {
return [];
}
$fetched_contact = false;
if (empty($update)) {
if (is_null($update)) {
$ref_update = DateTimeFormat::utc('now - 1 month');
} else {
$ref_update = DBA::NULL_DATETIME;
}
$apcontact = DBA::selectFirst('apcontact', [], ['url' => $url]);
if (!DBA::isResult($apcontact)) {
$apcontact = DBA::selectFirst('apcontact', [], ['alias' => $url]);
}
if (!DBA::isResult($apcontact)) {
$apcontact = DBA::selectFirst('apcontact', [], ['addr' => $url]);
}
if (DBA::isResult($apcontact) && ($apcontact['updated'] > $ref_update) && !empty($apcontact['pubkey'])) {
return $apcontact;
}
if (!is_null($update)) {
return DBA::isResult($apcontact) ? $apcontact : [];
}
if (DBA::isResult($apcontact)) {
$fetched_contact = $apcontact;
}
}
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$apcontact = [];
$webfinger = empty(parse_url($url, PHP_URL_SCHEME));
if ($webfinger) {
$apcontact = self::fetchWebfingerData($url);
if (empty($apcontact['url'])) {
return $fetched_contact;
}
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$url = $apcontact['url'];
}
$data = ActivityPub::fetchContent($url);
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if (empty($data)) {
return $fetched_contact;
}
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$compacted = JsonLD::compact($data);
if (empty($compacted['@id'])) {
return $fetched_contact;
}
// Detect multiple fast repeating request to the same address
// See https://github.com/friendica/friendica/issues/9303
$cachekey = 'apcontact:getByURL:' . $url;
$result = DI::cache()->get($cachekey);
if (!is_null($result)) {
Logger::notice('Multiple requests for the address', ['url' => $url, 'update' => $update, 'callstack' => System::callstack(20), 'result' => $result]);
} else {
DI::cache()->set($cachekey, System::callstack(20), Duration::FIVE_MINUTES);
}
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$apcontact['url'] = $compacted['@id'];
$apcontact['uuid'] = JsonLD::fetchElement($compacted, 'diaspora:guid', '@value');
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$apcontact['type'] = str_replace('as:', '', JsonLD::fetchElement($compacted, '@type'));
$apcontact['following'] = JsonLD::fetchElement($compacted, 'as:following', '@id');
$apcontact['followers'] = JsonLD::fetchElement($compacted, 'as:followers', '@id');
$apcontact['inbox'] = JsonLD::fetchElement($compacted, 'ldp:inbox', '@id');
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self::unarchiveInbox($apcontact['inbox'], false);
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$apcontact['outbox'] = JsonLD::fetchElement($compacted, 'as:outbox', '@id');
$apcontact['sharedinbox'] = '';
if (!empty($compacted['as:endpoints'])) {
$apcontact['sharedinbox'] = JsonLD::fetchElement($compacted['as:endpoints'], 'as:sharedInbox', '@id');
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self::unarchiveInbox($apcontact['sharedinbox'], true);
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}
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$apcontact['nick'] = JsonLD::fetchElement($compacted, 'as:preferredUsername', '@value') ?? '';
$apcontact['name'] = JsonLD::fetchElement($compacted, 'as:name', '@value');
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if (empty($apcontact['name'])) {
$apcontact['name'] = $apcontact['nick'];
}
$apcontact['about'] = HTML::toBBCode(JsonLD::fetchElement($compacted, 'as:summary', '@value'));
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$apcontact['photo'] = JsonLD::fetchElement($compacted, 'as:icon', '@id');
if (is_array($apcontact['photo']) || !empty($compacted['as:icon']['as:url']['@id'])) {
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$apcontact['photo'] = JsonLD::fetchElement($compacted['as:icon'], 'as:url', '@id');
}
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if (empty($apcontact['alias'])) {
$apcontact['alias'] = JsonLD::fetchElement($compacted, 'as:url', '@id');
if (is_array($apcontact['alias'])) {
$apcontact['alias'] = JsonLD::fetchElement($compacted['as:url'], 'as:href', '@id');
}
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}
// Quit if none of the basic values are set
if (empty($apcontact['url']) || empty($apcontact['inbox']) || empty($apcontact['type'])) {
return $fetched_contact;
}
// Quit if this doesn't seem to be an account at all
if (!in_array($apcontact['type'], ActivityPub::ACCOUNT_TYPES)) {
return $fetched_contact;
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}
$parts = parse_url($apcontact['url']);
unset($parts['scheme']);
unset($parts['path']);
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if (empty($apcontact['addr'])) {
if (!empty($apcontact['nick'])) {
$apcontact['addr'] = $apcontact['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
} else {
$apcontact['addr'] = '';
}
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}
$apcontact['pubkey'] = null;
if (!empty($compacted['w3id:publicKey'])) {
$apcontact['pubkey'] = trim(JsonLD::fetchElement($compacted['w3id:publicKey'], 'w3id:publicKeyPem', '@value'));
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if (strstr($apcontact['pubkey'], 'RSA ')) {
$apcontact['pubkey'] = Crypto::rsaToPem($apcontact['pubkey']);
}
}
$apcontact['manually-approve'] = (int)JsonLD::fetchElement($compacted, 'as:manuallyApprovesFollowers');
if (!empty($compacted['as:generator'])) {
$apcontact['baseurl'] = JsonLD::fetchElement($compacted['as:generator'], 'as:url', '@id');
$apcontact['generator'] = JsonLD::fetchElement($compacted['as:generator'], 'as:name', '@value');
}
if (!empty($apcontact['following'])) {
$data = ActivityPub::fetchContent($apcontact['following']);
if (!empty($data)) {
if (!empty($data['totalItems'])) {
$apcontact['following_count'] = $data['totalItems'];
}
}
}
if (!empty($apcontact['followers'])) {
$data = ActivityPub::fetchContent($apcontact['followers']);
if (!empty($data)) {
if (!empty($data['totalItems'])) {
$apcontact['followers_count'] = $data['totalItems'];
}
}
}
if (!empty($apcontact['outbox'])) {
$data = ActivityPub::fetchContent($apcontact['outbox']);
if (!empty($data)) {
if (!empty($data['totalItems'])) {
$apcontact['statuses_count'] = $data['totalItems'];
}
}
}
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// To-Do
// Unhandled
// tag, attachment, image, nomadicLocations, signature, featured, movedTo, liked
// Unhandled from Misskey
// sharedInbox, isCat
// Unhandled from Kroeg
// kroeg:blocks, updated
// When the photo is too large, try to shorten it by removing parts
if (strlen($apcontact['photo']) > 255) {
$parts = parse_url($apcontact['photo']);
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unset($parts['fragment']);
$apcontact['photo'] = Network::unparseURL($parts);
if (strlen($apcontact['photo']) > 255) {
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unset($parts['query']);
$apcontact['photo'] = Network::unparseURL($parts);
}
if (strlen($apcontact['photo']) > 255) {
$apcontact['photo'] = substr($apcontact['photo'], 0, 255);
}
}
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if (!$webfinger && !empty($apcontact['addr'])) {
$data = self::fetchWebfingerData($apcontact['addr']);
if (!empty($data)) {
$apcontact['baseurl'] = $data['baseurl'];
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if (empty($apcontact['alias']) && !empty($data['alias'])) {
$apcontact['alias'] = $data['alias'];
}
if (!empty($data['subscribe'])) {
$apcontact['subscribe'] = $data['subscribe'];
}
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} else {
$apcontact['addr'] = null;
}
}
if (empty($apcontact['baseurl'])) {
$apcontact['baseurl'] = null;
}
if (empty($apcontact['subscribe'])) {
$apcontact['subscribe'] = null;
}
if (!empty($apcontact['baseurl']) && empty($fetched_contact['gsid'])) {
$apcontact['gsid'] = GServer::getID($apcontact['baseurl']);
} elseif (!empty($fetched_contact['gsid'])) {
$apcontact['gsid'] = $fetched_contact['gsid'];
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} else {
$apcontact['gsid'] = null;
}
if ($apcontact['url'] == $apcontact['alias']) {
$apcontact['alias'] = null;
}
$apcontact['updated'] = DateTimeFormat::utcNow();
// We delete the old entry when the URL is changed
if ($url != $apcontact['url']) {
Logger::info('Delete changed profile url', ['old' => $url, 'new' => $apcontact['url']]);
DBA::delete('apcontact', ['url' => $url]);
}
if (DBA::exists('apcontact', ['url' => $apcontact['url']])) {
DBA::update('apcontact', $apcontact, ['url' => $apcontact['url']]);
} else {
DBA::replace('apcontact', $apcontact);
}
Logger::info('Updated profile', ['url' => $url]);
return $apcontact;
}
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/**
* Unarchive inboxes
*
* @param string $url inbox url
*/
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private static function unarchiveInbox($url, $shared)
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{
if (empty($url)) {
return;
}
$now = DateTimeFormat::utcNow();
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$fields = ['archive' => false, 'success' => $now, 'shared' => $shared];
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if (!DBA::exists('inbox-status', ['url' => $url])) {
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$fields = array_merge($fields, ['url' => $url, 'created' => $now]);
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DBA::replace('inbox-status', $fields);
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} else {
DBA::update('inbox-status', $fields, ['url' => $url]);
}
}
}