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# Mercureact
This is an implementation of the Mercure realtime protocol on steroids, built using ReactPHP.
It is intended to be used standalone, but it may also be integrated into another PHP application.
## ToDos
**Mercureact is under development, and not ready for use in anything important.**
- [ ] Security Security Security
- [ ] Check JWTs on connect
- [ ] Check claims on subscribe and publish
- [ ] WebSocket authentication
- [ ] Subscription manager
- [ ] Publish events
- [ ] Server-Side Events distributor
- [x] Distribute events
- [ ] WebSocket distributor
- [ ] Setup subscriptions
- [ ] Dynamic subscriptions
- [x] Distribute events

13
bin/mercureactd Executable file
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#!/usr/bin/env php
<?php
use NoccyLabs\Mercureact\Configuration;
use NoccyLabs\Mercureact\Daemon;
require_once __DIR__."/../vendor/autoload.php";
$config = Configuration::createDefault()
->setJwtSecret("!ChangeThisMercureHubJWTSecretKey!");
$daemon = new Daemon($config);
$daemon->start();

31
composer.json Normal file
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{
"name": "noccylabs/mercureact",
"description": "An implementation of the Mercure specification for distributing SSE to subscribers",
"type": "application",
"require": {
"react/react": "^1.4",
"noccylabs/simple-jwt": "^0.2.1",
"noccylabs/react-websocket": "0.1.3.1",
"monolog/monolog": "^3.5",
"symfony/uid": "^7.0"
},
"require-dev": {
"phpunit/phpunit": "^11.0",
"phpstan/phpstan": "^1.10"
},
"license": "GPL-3.0-or-later",
"autoload": {
"psr-4": {
"NoccyLabs\\Mercureact\\": "src/"
}
},
"authors": [
{
"name": "NoccyLabs",
"email": "labs@noccy.com"
}
],
"bin": [
"bin/mercureactd"
]
}

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4
doc/SecurityNotes.md Normal file
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# Security
This is alpha quality software. Expect, and please report, any bugs encountered.

59
src/Broker/Message.php Normal file
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<?php
namespace NoccyLabs\Mercureact\Broker;
use SplObjectStorage;
class Message
{
/** @var array<int,string> The topic, if more than one the first is canonical, but all receive delivery */
public readonly array $topic;
/** @var string|null The SSE event type */
public readonly ?string $type;
/** @var string|null Message data */
public readonly ?string $data;
/** @var bool|null Private update*/
public readonly ?bool $private;
/** @var string|null Message ID */
public readonly ?string $id;
/** @var int SSE retry interval */
public readonly ?int $retry;
private readonly int $created;
public function __construct(
array $topic,
?string $type,
?string $data,
?bool $private,
?string $id,
?int $retry
)
{
$this->topic = $topic;
$this->type = $type;
$this->data = $data;
$this->private = $private;
$this->id = $id;
$this->retry = $retry;
$this->created = time();
}
public function getAge(): int
{
return time() - $this->created;
}
public static function fromData(array $data): Message
{
return new Message(
topic: (array)$data['topic'],
type: $data['type']??null,
data: $data['data']??null,
private: match ($data['private']??null) { "on" => true, null => null, default => false },
id: $data['id']??null,
retry: $data['retry']??null,
);
}
}

20
src/Broker/SubscriptionList.php Normal file
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<?php
namespace NoccyLabs\Mercureact\Broker;
use Countable;
use SplObjectStorage;
class SubscriptionList implements Countable
{
private array $subscriptions = [];
public function count(): int
{
return count($this->subscriptions);
}
}

67
src/Broker/Topic.php Normal file
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<?php
namespace NoccyLabs\Mercureact\Broker;
use SplObjectStorage;
class Topic
{
const MAX_HISTORY_AGE = 180;
/** @var string Topic name */
private string $topic;
/** @var array<string,Message> */
private array $messages = [];
/** @var int Creation unixtime */
private int $created;
private SubscriptionList $subscribers;
public function __construct(string $topic)
{
$this->topic = $topic;
$this->subscribers = new SubscriptionList();
$this->created = time();
}
public function publish(Message $message)
{
// TODO check if message id has already been published
foreach ($this->subscribers as $subscriber) {
if ($message->private === true) {
// TODO check subscriber access
} else {
// TODO deliver to subscriber
}
}
}
public function getAge(): int
{
return time() - $this->created;
}
public function getHistorySize(): int
{
return count($this->messages);
}
public function getSubscriberCount(): int
{
return count($this->subscribers);
}
/**
* Garbage collect histry
*
*/
public function garbageCollect(): void
{
$this->messages = array_filter(
$this->messages,
fn($message) => $message->getAge() < self::MAX_HISTORY_AGE
);
}
}

50
src/Broker/TopicManager.php Normal file
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<?php
namespace NoccyLabs\Mercureact\Broker;
use SplObjectStorage;
class TopicManager
{
/** @var array<string,Topic> */
private array $topics = [];
public function getTopic(string $topic): Topic
{
if (!isset($this->topics[$topic])) {
$this->topics[$topic] = new Topic($topic);
}
return $this->topics[$topic];
}
public function publish(Message $message): void
{
foreach ($message->topic as $topic) {
$this->getTopic($topic)->publish($message);
}
}
public function getTopicCount(): int
{
return count($this->topics);
}
public function getSubscriberCount(): int
{
return array_sum(array_map(fn($t) => $t->getSubscriberCount(), $this->topics));
}
public function garbageCollect(): void
{
$this->topics = array_filter(
$this->topics,
function (Topic $topic) {
$topic->garbageCollect();
return ($topic->getHistorySize() > 0 && $topic->getSubscriberCount() > 0) || ($topic->getAge() < 60);
}
);
}
}

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src/Configuration.php Normal file
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<?php
namespace NoccyLabs\Mercureact;
class Configuration
{
private ?string $publicUrl = null;
private ?string $jwtSecret = null;
public static function createDefault(): Configuration
{
return new Configuration();
}
public function setPublicUrl(string $publicUrl): self
{
$this->publicUrl = $publicUrl;
return $this;
}
public function getPublicUrl(): ?string
{
return $this->publicUrl;
}
public function setJwtSecret(string $secret): self
{
$this->jwtSecret = $secret;
return $this;
}
public function getJwtSecret(): ?string
{
return $this->jwtSecret;
}
}

48
src/Daemon.php Normal file
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<?php
namespace NoccyLabs\Mercureact;
use NoccyLabs\Mercureact\Http\Server;
use React\EventLoop\Loop;
use React\EventLoop\LoopInterface;
use React\Socket\SocketServer;
class Daemon
{
private Configuration $config;
private LoopInterface $loop;
private Server $server;
public function __construct(Configuration $config, ?LoopInterface $loop=null)
{
$this->config = $config;
$this->loop = $loop??Loop::get();
}
public function start(): void
{
$this->server = new Server($this->config, []);
$socket = new SocketServer("tcp://0.0.0.0:9000");
$this->server->listen($socket);
}
public function stop(): void
{
$this->loop->stop();
}
public function abort(int $exitcode, ?string $message=null): void
{
$bt = debug_backtrace(limit:2);
$bt = end($bt);
fprintf(STDERR, "Abort: %s\n at %s:%d\n in %s\n", $message??"Unknown reason", $bt['file'], $bt['line'], ($bt['class']??null).($bt['type']??null).$bt['function']);
$this->loop->stop();
register_shutdown_function(function () use ($exitcode) {
exit($exitcode);
});
}
}

12
src/Http/Exception/RequestException.php Normal file
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<?php
namespace NoccyLabs\Mercureact\Http\Exeption;
use Exception;
class RequestException extends Exception
{
const ERR_BAD_REQUEST = 51001;
const ERR_BAD_REQUEST_DATA = 51002;
const ERR_INVALID_REQUEST_DATA = 51003;
}

10
src/Http/Exception/SecurityException.php Normal file
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<?php
namespace NoccyLabs\Mercureact\Http\Exeption;
use Exception;
class SecurityException extends Exception
{
const ERR_ACCESS_DENIED = 50001;
}

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src/Http/Server.php Normal file
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<?php
namespace NoccyLabs\Mercureact\Http;
use NoccyLabs\Mercureact\Broker\Message;
use NoccyLabs\Mercureact\Broker\TopicManager;
use NoccyLabs\Mercureact\Configuration;
use NoccyLabs\Mercureact\Http\Exeption\RequestException;
use NoccyLabs\Mercureact\Http\Exeption\SecurityException;
use NoccyLabs\React\WebSocket\WebSocketConnection;
use NoccyLabs\React\WebSocket\WebSocketMiddleware;
use NoccyLabs\SimpleJWT\JWTToken;
use NoccyLabs\SimpleJWT\Key\JWTPlaintextKey;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use React\EventLoop\Loop;
use React\EventLoop\LoopInterface;
use React\Http\HttpServer;
use React\Http\Message\Response;
use React\Promise\Promise;
use React\Promise\PromiseInterface;
use React\Socket\ServerInterface;
use React\Stream\ThroughStream;
use SplObjectStorage;
use Symfony\Component\Uid\Uuid;
use Throwable;
class Server
{
private Configuration $config;
private LoopInterface $loop;
private HttpServer $server;
private WebSocketMiddleware $webSocket;
private SplObjectStorage $webSocketClients;
private SplObjectStorage $eventClients;
private TopicManager $topicManager;
public static string $indexPage;
/**
*
*
*/
public function __construct(Configuration $config, array $options=[], ?LoopInterface $loop=null)
{
$this->loop = $loop??Loop::get();
$this->config = $config;
$this->topicManager = new TopicManager();
$this->server = $this->createHttpServer($options);
$this->webSocket = new WebSocketMiddleware();
$this->eventClients = new SplObjectStorage();
$this->webSocketClients = new SplObjectStorage();
$this->webSocket->on(WebSocketMiddleware::EVENT_CONNECTION, $this->onWebSocketConnection(...));
}
/**
*
*
* @return void
*/
public function listen(ServerInterface $socket): void
{
$this->server->listen($socket);
}
/**
*
* @return HttpServer
*/
private function createHttpServer(array $options): HttpServer
{
return new HttpServer(
$this->rejectionWrappingMiddleware(...),
$this->checkRequestSecurityMiddleware(...),
$this->handleWebSocketRequest(...),
$this->handleMercureRequest(...),
$this->handleApiRequest(...),
$this->handleNotFound(...)
);
}
/**
*
*
* @param ServerRequestInterface $request
* @return PromiseInterface
*/
private function handleNotFound(ServerRequestInterface $request): PromiseInterface
{
return new Promise(
function ($resolve) {
$resolve(Response::plaintext("Not found")->withStatus(404));
}
);
}
/**
*
*
* @param ServerRequestInterface $request
* @param callable $next
* @return PromiseInterface
*/
private function rejectionWrappingMiddleware(ServerRequestInterface $request, callable $next): PromiseInterface
{
$promise = new Promise(
function (callable $resolve) use ($request, $next) {
$resolve($next($request));
}
);
return $promise->then(
function ($response) {
if ($response instanceof ResponseInterface) {
return $response;
}
if (is_array($response)) {
return Response::json($response);
}
if (is_string($response)) {
return Response::plaintext($response);
}
return Response::plaintext((string)$response);
},
function (Throwable $t) {
if ($t instanceof SecurityException) {
return Response::plaintext("Access Denied")->withStatus(Response::STATUS_UNAUTHORIZED);
}
return Response::plaintext("500: Internal Server Error (".$t->getMessage().")\n")->withStatus(500);
}
)->then(
function ($response) use ($request) {
assert("\$response instanceof ResponseInterface");
$host = ($request->getServerParams()['SERVER_ADDR']??"");
//. ":" . ($request->getServerParams()['SERVER_PORT']??"80");
fprintf(STDOUT, "%s %3d %s %s %d\n",
$request->getServerParams()['REMOTE_ADDR'],
$response->getStatusCode(),
$request->getMethod(),
$request->getUri()->getPath(),
strlen($response->getBody())
);
return $response
->withAddedHeader('Link', '<https://'.$host.'/.well-known/mercure>; rel="mercure"')
->withAddedHeader('Link', '<wss://'.$host.'/.well-known/mercure>; rel="mercure+ws"')
->withHeader('Access-Control-Allow-Origin', '*')
->withHeader('Content-Security-Policy', "default-src * 'self' http: 'unsafe-eval' 'unsafe-inline'; connect-src * 'self'")
->withHeader('Cache-Control', 'must-revalidate')
->withHeader('Server', 'Mercureact/0.1.0');
}
);
}
/**
*
*
* @param ServerRequestInterface $request
* @param callable $next
* @return PromiseInterface
*/
private function checkRequestSecurityMiddleware(ServerRequestInterface $request, callable $next): PromiseInterface
{
return new Promise(
function (callable $resolve, callable $reject) use ($request, $next) {
// Check JWT in authorization header or authorization query param
$request = $this->checkAuthorization($request);
$resolve($next($request));
}
);
}
/**
*
*
* @param ServerRequestInterface $request
* @return ServerRequestInterface
*/
private function checkAuthorization(ServerRequestInterface $request): ServerRequestInterface
{
$authorization = $request->getHeaderLine('authorization');
if (str_starts_with(strtolower($authorization), "bearer ")) {
$jwt = substr($authorization, strpos($authorization, " ")+1);
$key = new JWTPlaintextKey($this->config->getJwtSecret());
$tok = new JWTToken($key, $jwt);
if (!$tok->isValid()) {
throw new SecurityException(message:"Invalid token", code:SecurityException::ERR_ACCESS_DENIED);
}
$mercureClaims = $tok->claims->get('mercure');
return $request
->withAttribute('authorization', $tok);
} else {
return $request
->withAttribute('authorization', null);
}
}
/**
*
*
* @param ServerRequestInterface $request
* @param callable $next
* @return PromiseInterface
*/
private function handleMercureRequest(ServerRequestInterface $request, callable $next): PromiseInterface
{
return new Promise(
function (callable $resolve, callable $reject) use ($next, $request) {
if ($request->getUri()->getPath() == "/.well-known/mercure") {
if ($request->getMethod() == 'POST') {
$resolve($this->handleMercurePublish($request));
return;
}
$resolve($this->handleMercureClient($request));
} else {
$resolve($next($request));
}
}
);
}
/**
*
*
* @param ServerRequestInterface $request
* @return ResponseInterface
*/
private function handleMercureClient(ServerRequestInterface $request): ResponseInterface
{
$tok = $request->getAttribute('authorization');
if ($tok instanceof JWTToken) {
$claims = $tok->claims->getAll();
if (isset($claims['mercure']['subscribe'])) {
$subscribeClaims = $claims['mercure']['subscribe'];
// TODO check topic against subscribeClaims
}
}
$responseStream = new ThroughStream();
$response = new Response(
body: $responseStream
);
$this->eventClients->attach($responseStream, $request);
$responseStream->on('close', function () use ($responseStream) {
$this->eventClients->detach($responseStream);;
});
return $response
->withHeader("Cache-Control", "no-store")
->withHeader("Content-Type", "text/event-stream");
}
/**
*
*
* @param ServerRequestInterface $request
* @return ResponseInterface
*/
private function handleMercurePublish(ServerRequestInterface $request): ResponseInterface
{
if ($request->getHeaderLine('content-type') !== 'application/x-www-form-urlencoded') {
throw new \Exception("Invalid request");
}
// Grab the JWT token from the requests authorization attribute
$tok = $request->getAttribute('authorization');
if ($tok instanceof JWTToken) {
$claims = $tok->claims->getAll();
if (isset($claims['mercure']['publish'])) {
$publishClaims = $claims['mercure']['publish'];
// TODO check topic against publishClaims
}
}
// Parse out the urlencoded body. Pretty sure there is a better way to do this?
$body = explode("&", (string)$request->getBody());
$data = [];
foreach ($body as $param) {
if (!str_contains($param, "=")) throw new RequestException("Invalid request data", RequestException::ERR_INVALID_REQUEST_DATA);
[ $name, $value ] = array_map('urldecode', explode("=", $param, 2));
// FIXME support multiple topics?
if (in_array($name, [ 'topic' ])) {
if (!isset($data[$name]))
$data[$name] = [];
$data[$name][] = $value;
} else {
$data[$name] = $value;
}
}
// Put an id in there if none already
// TODO add a configurable for this
if (!isset($data['id'])) {
$data['id'] = (string)Uuid::v7();
}
$message = Message::fromData($data);
$this->loop->futureTick(function () use ($message) {
$this->publishMercureMessage($message);
});
return Response::plaintext("urn:uuid:".$message->id."\n");
}
/**
*
*
* @param Message $message
* @return void
*/
private function publishMercureMessage(Message $message): void
{
foreach ($this->webSocketClients as $webSocket) {
$webSocket->write(json_encode([
'type' => $message->type,
//'topic' => $data['topic'],
'data' => (@json_decode($message->data))??$message->data
]));
}
$sseMessage = "";
if ($message->type) {
$sseMessage .= "event: ".$message->type."\n";
}
$sseMessage .= "data: ".$message->data."\n\n";
foreach ($this->eventClients as $client) {
$client->write($sseMessage);
}
}
/**
*
*
* @param ServerRequestInterface $request
* @param callable $next
* @return PromiseInterface
*/
private function handleWebSocketRequest(ServerRequestInterface $request, callable $next): PromiseInterface
{
return new Promise(
function (callable $resolve, callable $reject) use ($next, $request) {
if ($request->getUri()->getPath() == "/.well-known/mercure")
$resolve(call_user_func($this->webSocket, $request, $next));
else
$resolve($next($request));
}
);
}
/**
*
*
*/
private function onWebSocketConnection(WebSocketConnection $connection)
{
$this->webSocketClients->attach($connection);
$connection->on('close', function () use ($connection) {
$this->webSocketClients->detach($connection);
});
$request = $connection->getServerRequest();
$topic = $request->getQueryParams()['topic'][0]??'';
$connection->setGroup($topic);
}
/**
*
*
* @param ServerRequestInterface $request
* @param callable $next
* @return PromiseInterface
*/
private function handleApiRequest(ServerRequestInterface $request, callable $next): PromiseInterface
{
return new Promise(
function (callable $resolve, callable $reject) use ($next, $request) {
$path = $request->getUri()->getPath();
if ($path === "/index.html") {
$resolve(Response::html(self::$indexPage));
}
switch (true) {
case preg_match('<^/.well-known/mercure/subscriptions(/.+?)$>', $path, $m):
$query = explode("/", trim($m[1]??null, "/"));
$topic = array_shift($query);
$subscription = array_shift($query);
$resolve($this->apiGetSubscriptions($topic, $subscription));
return;
case preg_match('<^/.well-known/mercureact/status$>', $path):
$resolve([
'server' => 'Mercureact/1.0',
'topics' => $this->topicManager->getTopicCount(),
'subscriptions' => $this->topicManager->getSubscriberCount(),
'memoryPeak' => memory_get_peak_usage(true),
'memoryUsage' => memory_get_usage(true)
]);
return;
case preg_match('<^/.well-known/mercureact/status$>', $path):
$resolve([ 'version' => '1.0' ]);
return;
}
$resolve($next($request));
}
);
}
/**
*
*
* @return ResponseInterface
*/
private function apiGetSubscriptions(string|null $topic, string|null $subscription): ResponseInterface
{
$lastEventId = "urn:uuid:5e94c686-2c0b-4f9b-958c-92ccc3bbb4eb";
$data = [
"@context" => "https://mercure.rocks/",
"id" => "/.well-known/mercure/subscriptions",
"type" => "Subscriptions",
"lastEventID" => $lastEventId,
"subscriptions" => []
];
return Response::json($data)
->withHeader('Content-Type', 'application/ld+json')
->withHeader('ETag', $lastEventId);
}
}
Server::$indexPage = <<<ENDHTML
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' http: 'unsafe-eval' 'unsafe-inline'; style-src 'self';">
</head>
<body>
<script type="text/javascript">
const events = new EventSource("http://127.0.0.1:9000/.well-known/mercure");
events.onmessage = msg => console.log(msg);
</script>
</body>
</html>
ENDHTML;