gnu-social/components/FreeNetwork/FreeNetwork.php

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<?php
declare(strict_types = 1);
// {{{ License
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
// }}}
namespace Component\FreeNetwork;
use App\Core\Event;
use App\Entity\Activity;
use Plugin\ActivityPub\Entity\ActivitypubActor;
use function App\Core\I18n\_m;
use App\Core\Log;
use App\Core\Modules\Component;
use App\Core\Router\RouteLoader;
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use App\Core\Router\Router;
use App\Entity\Actor;
use App\Entity\LocalUser;
use App\Entity\Note;
use App\Util\Common;
use App\Util\Exception\ClientException;
use App\Util\Exception\NoSuchActorException;
use App\Util\Exception\ServerException;
use App\Util\Nickname;
use Component\FreeNetwork\Controller\HostMeta;
use Component\FreeNetwork\Controller\OwnerXrd;
use Component\FreeNetwork\Controller\Webfinger;
use Component\FreeNetwork\Util\Discovery;
use Component\FreeNetwork\Util\WebfingerResource;
use Component\FreeNetwork\Util\WebfingerResource\WebfingerResourceActor;
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use Component\FreeNetwork\Util\WebfingerResource\WebfingerResourceNote;
use Exception;
use Plugin\ActivityPub\Entity\ActivitypubActivity;
use Plugin\ActivityPub\Util\Response\TypeResponse;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Response;
use XML_XRD_Element_Link;
use function count;
use function in_array;
use const PREG_SET_ORDER;
/**
* Implements WebFinger (RFC7033) for GNU social, as well as Link-based Resource Descriptor Discovery based on RFC6415,
* Web Host Metadata ('.well-known/host-meta') resource.
*
* @package GNUsocial
*
* @author Mikael Nordfeldth <mmn@hethane.se>
* @author Diogo Peralta Cordeiro <mail@diogo.site>
*/
class FreeNetwork extends Component
{
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public const PLUGIN_VERSION = '0.1.0';
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public const OAUTH_ACCESS_TOKEN_REL = 'http://apinamespace.org/oauth/access_token';
public const OAUTH_REQUEST_TOKEN_REL = 'http://apinamespace.org/oauth/request_token';
public const OAUTH_AUTHORIZE_REL = 'http://apinamespace.org/oauth/authorize';
public function onAddRoute(RouteLoader $m): bool
{
$m->connect('freenetwork_hostmeta', '.well-known/host-meta', [HostMeta::class, 'handle']);
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$m->connect(
'freenetwork_hostmeta_format',
'.well-known/host-meta.:format',
[HostMeta::class, 'handle'],
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['format' => '(xml|json)'],
);
// the resource GET parameter can be anywhere, so don't mention it here
$m->connect('freenetwork_webfinger', '.well-known/webfinger', [Webfinger::class, 'handle']);
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$m->connect(
'freenetwork_webfinger_format',
'.well-known/webfinger.:format',
[Webfinger::class, 'handle'],
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['format' => '(xml|json)'],
);
$m->connect('freenetwork_ownerxrd', 'main/ownerxrd', [OwnerXrd::class, 'handle']);
return Event::next;
}
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public function onStartGetProfileAcctUri(Actor $profile, &$acct): bool
{
$wfr = new WebFingerResourceActor($profile);
try {
$acct = $wfr->reconstructAcct();
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} catch (Exception) {
return Event::next;
}
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return Event::stop;
}
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public function onEndGetWebFingerResource($resource, ?WebfingerResource &$target = null, array $args = [])
{
// * Either we didn't find the profile, then we want to make
// the $profile variable null for clarity.
// * Or we did find it but for a possibly malicious remote
// user who might've set their profile URL to a Note URL
// which would've caused a sort of DoS unless we continue
// our search here by discarding the remote profile.
$profile = null;
if (Discovery::isAcct($resource)) {
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$parts = explode('@', mb_substr(urldecode($resource), 5)); // 5 is strlen of 'acct:'
if (count($parts) === 2) {
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[$nick, $domain] = $parts;
if ($domain !== $_ENV['SOCIAL_DOMAIN']) {
throw new ServerException(_m('Remote profiles not supported via WebFinger yet.'));
}
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$nick = Nickname::normalize(nickname: $nick, check_already_used: false, check_is_allowed: false);
$freenetwork_actor = LocalUser::getWithPK(['nickname' => $nick]);
if (!($freenetwork_actor instanceof LocalUser)) {
throw new NoSuchActorException($nick);
}
$profile = $freenetwork_actor->getActor();
}
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} else {
try {
if (Common::isValidHttpUrl($resource)) {
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// This means $resource is a valid url
$resource_parts = parse_url($resource);
// TODO: Use URLMatcher
if ($resource_parts['host'] === $_ENV['SOCIAL_DOMAIN']) { // XXX: Common::config('site', 'server')) {
$str = $resource_parts['path'];
// actor_view_nickname
$renick = '/\/@(' . Nickname::DISPLAY_FMT . ')\/?/m';
// actor_view_id
$reuri = '/\/actor\/(\d+)\/?/m';
if (preg_match_all($renick, $str, $matches, PREG_SET_ORDER, 0) === 1) {
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$profile = LocalUser::getWithPK(['nickname' => $matches[0][1]])->getActor();
} elseif (preg_match_all($reuri, $str, $matches, PREG_SET_ORDER, 0) === 1) {
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$profile = Actor::getById((int) $matches[0][1]);
}
}
}
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} catch (NoSuchActorException $e) {
// not a User, maybe a Note? we'll try that further down...
// try {
// Log::debug(__METHOD__ . ': Finding User_group URI for WebFinger lookup on resource==' . $resource);
// $group = new User_group();
// $group->whereAddIn('uri', array_keys($alt_urls), $group->columnType('uri'));
// $group->limit(1);
// if ($group->find(true)) {
// $profile = $group->getProfile();
// }
// unset($group);
// } catch (Exception $e) {
// Log::error(get_class($e) . ': ' . $e->getMessage());
// throw $e;
// }
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}
}
if ($profile instanceof Actor) {
Log::debug(__METHOD__ . ': Found Profile with ID==' . $profile->getID() . ' for resource==' . $resource);
$target = new WebfingerResourceActor($profile);
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return Event::stop; // We got our target, stop handler execution
}
$APNote = ActivitypubActivity::getWithPK(['object_uri' => $resource]);
if ($APNote instanceof ActivitypubActivity) {
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$target = new WebfingerResourceNote(Note::getWithPK(['id' => $APNote->getObjectId()]));
return Event::stop; // We got our target, stop handler execution
}
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return Event::next;
}
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public function onStartHostMetaLinks(array &$links): bool
{
foreach (Discovery::supportedMimeTypes() as $type) {
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$links[] = new XML_XRD_Element_Link(
Discovery::LRDD_REL,
Router::url(id: 'freenetwork_webfinger', args: [], type: Router::ABSOLUTE_URL) . '?resource={uri}',
$type,
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isTemplate: true,
);
}
// TODO OAuth connections
//$links[] = new XML_XRD_Element_link(self::OAUTH_ACCESS_TOKEN_REL, common_local_url('ApiOAuthAccessToken'));
//$links[] = new XML_XRD_Element_link(self::OAUTH_REQUEST_TOKEN_REL, common_local_url('ApiOAuthRequestToken'));
//$links[] = new XML_XRD_Element_link(self::OAUTH_AUTHORIZE_REL, common_local_url('ApiOAuthAuthorize'));
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return Event::next;
}
/**
* Add a link header for LRDD Discovery
*/
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public function onStartShowHTML($action): bool
{
if ($action instanceof ShowstreamAction) {
$resource = $action->getTarget()->getUri();
$url = common_local_url('webfinger') . '?resource=' . urlencode($resource);
foreach ([Discovery::JRD_MIMETYPE, Discovery::XRD_MIMETYPE] as $type) {
header('Link: <' . $url . '>; rel="' . Discovery::LRDD_REL . '"; type="' . $type . '"', false);
}
}
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return Event::next;
}
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public function onStartDiscoveryMethodRegistration(Discovery $disco): bool
{
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$disco->registerMethod('\Component\FreeNetwork\Util\LrddMethod\LrddMethodWebfinger');
return Event::next;
}
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public function onEndDiscoveryMethodRegistration(Discovery $disco): bool
{
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$disco->registerMethod('\Component\FreeNetwork\Util\LrddMethod\LrddMethodHostMeta');
$disco->registerMethod('\Component\FreeNetwork\Util\LrddMethod\LrddMethodLinkHeader');
$disco->registerMethod('\Component\FreeNetwork\Util\LrddMethod\LrddMethodLinkHtml');
return Event::next;
}
/**
* @throws ClientException
* @throws ServerException
*/
public function onControllerResponseInFormat(string $route, array $accept_header, array $vars, ?TypeResponse &$response = null): bool
{
if (!in_array($route, ['freenetwork_hostmeta', 'freenetwork_hostmeta_format', 'freenetwork_webfinger', 'freenetwork_webfinger_format', 'freenetwork_ownerxrd'])) {
return Event::next;
}
$mimeType = array_intersect(array_values(Discovery::supportedMimeTypes()), $accept_header);
/*
* "A WebFinger resource MUST return a JRD as the representation
* for the resource if the client requests no other supported
* format explicitly via the HTTP "Accept" header. [...]
* The WebFinger resource MUST silently ignore any requested
* representations that it does not understand and support."
* -- RFC 7033 (WebFinger)
* http://tools.ietf.org/html/rfc7033
*/
$mimeType = count($mimeType) !== 0 ? array_pop($mimeType) : $vars['default_mimetype'];
$headers = [];
if (Common::config('discovery', 'cors')) {
$headers['Access-Control-Allow-Origin'] = '*';
}
$headers['Content-Type'] = $mimeType;
$response = match ($mimeType) {
Discovery::XRD_MIMETYPE => new Response(content: $vars['xrd']->to('xml'), headers: $headers),
Discovery::JRD_MIMETYPE, Discovery::JRD_MIMETYPE_OLD => new JsonResponse(data: $vars['xrd']->to('json'), headers: $headers, json: true),
};
return Event::stop;
}
/**
* Webfinger matches: @user@example.com or even @user--one.george_orwell@1984.biz
*
* @param string $text The text from which to extract webfinger IDs
* @param string $preMention Character(s) that signals a mention ('@', '!'...)
* @return array The matching IDs (without $preMention) and each respective position in the given string.
*/
public static function extractWebfingerIds(string $text, string $preMention = '@'): array
{
$wmatches = [];
$result = preg_match_all(
'/' . Nickname::BEFORE_MENTIONS . preg_quote($preMention, '/') . '(' . Nickname::WEBFINGER_FMT . ')/',
$text,
$wmatches,
PREG_OFFSET_CAPTURE
);
if ($result === false) {
Log::error(__METHOD__ . ': Error parsing webfinger IDs from text (preg_last_error==' . preg_last_error() . ').');
return [];
} elseif (($n_matches = count($wmatches)) != 0) {
Log::debug((sprintf('Found %d matches for WebFinger IDs: %s', $n_matches, print_r($wmatches, true))));
}
return $wmatches[1];
}
/**
* Profile URL matches: @param string $text The text from which to extract URL mentions
* @param string $preMention Character(s) that signals a mention ('@', '!'...)
* @return array The matching URLs (without @ or acct:) and each respective position in the given string.
* @example.com/mublog/user
*
*/
public static function extractUrlMentions(string $text, string $preMention = '@'): array
{
$wmatches = [];
// In the regexp below we need to match / _before_ URL_REGEX_VALID_PATH_CHARS because it otherwise gets merged
// with the TLD before (but / is in URL_REGEX_VALID_PATH_CHARS anyway, it's just its positioning that is important)
$result = preg_match_all(
'/(?:^|\s+)' . preg_quote($preMention, '/') . '(' . URL_REGEX_DOMAIN_NAME . '(?:\/[' . URL_REGEX_VALID_PATH_CHARS . ']*)*)/',
$text,
$wmatches,
PREG_OFFSET_CAPTURE
);
if ($result === false) {
Log::error(__METHOD__ . ': Error parsing profile URL mentions from text (preg_last_error==' . preg_last_error() . ').');
return [];
} elseif (count($wmatches)) {
Log::debug((sprintf('Found %d matches for profile URL mentions: %s', count($wmatches), print_r($wmatches, true))));
}
return $wmatches[1];
}
/**
* Find any explicit remote mentions. Accepted forms:
* Webfinger: @user@example.com
* Profile link: @param Actor $sender
* @param string $text input markup text
* @param $mentions
* @return bool hook return value
* @example.com/mublog/user
*/
public function onEndFindMentions(Actor $sender, string $text, array &$mentions): bool
{
$matches = [];
foreach (self::extractWebfingerIds($text, $preMention = '@') as $wmatch) {
[$target, $pos] = $wmatch;
Log::info("Checking webfinger person '$target'");
$actor = null;
$resource_parts = explode($preMention, $target);
if ($resource_parts[1] === $_ENV['SOCIAL_DOMAIN']) { // XXX: Common::config('site', 'server')) {
$actor = LocalUser::getWithPK(['nickname' => $resource_parts[0]])->getActor();
} else {
Event::handle('FreeNetworkFindMentions', [$target, &$actor]);
if (is_null($actor)) {
continue;
}
}
assert($actor instanceof Actor);
$displayName = $actor->getFullname() ?? $actor->getNickname() ?? $target; // TODO: we could do getBestName() or getFullname() here
$matches[$pos] = [
'mentioned' => [$actor],
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $actor->getUri()
];
}
foreach (self::extractUrlMentions($text) as $wmatch) {
[$target, $pos] = $wmatch;
$schemes = ['https', 'http'];
foreach ($schemes as $scheme) {
$url = "$scheme://$target";
if (Common::isValidHttpUrl($url)) {
// This means $resource is a valid url
Log::info("Checking actor address '$url'");
$actor = null;
$resource_parts = parse_url($url);
// TODO: Use URLMatcher
if ($resource_parts['host'] === $_ENV['SOCIAL_DOMAIN']) { // XXX: Common::config('site', 'server')) {
$str = $resource_parts['path'];
// actor_view_nickname
$renick = '/\/@(' . Nickname::DISPLAY_FMT . ')\/?/m';
// actor_view_id
$reuri = '/\/actor\/(\d+)\/?/m';
if (preg_match_all($renick, $str, $matches, PREG_SET_ORDER, 0) === 1) {
$actor = LocalUser::getWithPK(['nickname' => $matches[0][1]])->getActor();
} elseif (preg_match_all($reuri, $str, $matches, PREG_SET_ORDER, 0) === 1) {
$actor = Actor::getById((int) $matches[0][1]);
} else {
Log::error('Unexpected behaviour onEndFindMentions at FreeNetwork');
throw new ServerException('Unexpected behaviour onEndFindMentions at FreeNetwork');
}
} else {
Event::handle('FreeNetworkFindUrlMentions', [$url, &$actor]);
if (is_null($actor)) {
continue;
}
}
$displayName = $actor->getFullname() ?? $actor->getNickname() ?? $target; // TODO: we could do getBestName() or getFullname() here
$matches[$pos] = ['mentioned' => [$actor],
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $actor->getUri()
];
} else {
break;
}
}
}
foreach ($mentions as $i => $other) {
// If we share a common prefix with a local user, override it!
$pos = $other['position'];
if (isset($matches[$pos])) {
$mentions[$i] = $matches[$pos];
unset($matches[$pos]);
}
}
foreach ($matches as $mention) {
$mentions[] = $mention;
}
return Event::next;
}
public static function notify(Actor $sender, Activity $activity, array $targets, ?string $reason = null): bool
{
$protocols = [];
Event::handle('AddFreeNetworkProtocol', [&$protocols]);
foreach ($protocols as $protocol) {
$protocol::freeNetworkDistribute($sender, $activity, $targets, $reason);
}
return false;
}
public function onPluginVersion(array &$versions): bool
{
$versions[] = [
'name' => 'WebFinger',
'version' => self::PLUGIN_VERSION,
'author' => 'Mikael Nordfeldth',
'homepage' => GNUSOCIAL_ENGINE_URL,
// TRANS: Plugin description.
'rawdescription' => _m('WebFinger and LRDD support'),
];
return true;
}
}