react-http2/src/Http2Middleware.php

<?php

namespace NoccyLabs\React\Http2;

use NoccyLabs\React\Http2\Connection\Http2Connection;
use NoccyLabs\React\Http2\Frame\SettingsFrame;
use Psr\Http\Message\ServerRequestInterface;
use React\Stream\DuplexResourceStream;
use React\Stream\DuplexStreamInterface;
use React\Stream\ThroughStream;
use SplObjectStorage;

class Http2Middleware
{
    /** @var SplObjectStorage<Http2Connection> Active connections */
    private SplObjectStorage $connections;

    public function __construct()
    {
        $this->connections = new SplObjectStorage();
    }

    public function __invoke(ServerRequestInterface $request, ?callable $next=null)
    {
        // expect upgrade h2 for secure connections, h2c for plaintext

        // TODO handle HTTP/2 upgrade from HTTP/1.1
        // TODO handle HTTP/2 with prior knowledge

    }

    /**
     * Parse the settings frame present in the HTTP/1.1 upgrade request.
     * 
     * @param string $settings
     * @return SettingsFrame
     */
    private function parseSettingsFromBase64String(string $settings): SettingsFrame
    {
        $decoded = base64_decode($settings);
        $frame = new SettingsFrame();
        $frame->fromBinary($decoded);
        return $frame;
    }

    /**
     * Prepare a connection for the HTTP/2 session.
     * 
     * @param ServerRequestInterface $request
     * @return Http2Connection
     */
    private function setupConnection(ServerRequestInterface $request): Http2Connection
    {
        $stream = new ThroughStream();
        $connection = new Http2Connection($stream);

        $this->connections->attach($connection);
        $connection->on('close', function () use ($connection) {
            $this->connections->detach($connection);
        });

        return $connection;
    }
}