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Reactor Netty RSocket transport implementations (TCP, Websocket)

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/*
 * Copyright 2015-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.rsocket.transport.netty;

import static io.rsocket.transport.netty.UriUtils.getPort;
import static io.rsocket.transport.netty.UriUtils.isSecure;

import io.rsocket.transport.ClientTransport;
import io.rsocket.transport.ServerTransport;
import io.rsocket.transport.netty.client.WebsocketClientTransport;
import io.rsocket.transport.netty.server.WebsocketServerTransport;
import io.rsocket.uri.UriHandler;
import java.net.URI;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Optional;

/**
 * An implementation of {@link UriHandler} that creates {@link WebsocketClientTransport}s and {@link
 * WebsocketServerTransport}s.
 */
public final class WebsocketUriHandler implements UriHandler {

  private static final List SCHEME = Arrays.asList("ws", "wss", "http", "https");

  @Override
  public Optional buildClient(URI uri) {
    Objects.requireNonNull(uri, "uri must not be null");

    if (SCHEME.stream().noneMatch(scheme -> scheme.equals(uri.getScheme()))) {
      return Optional.empty();
    }

    return Optional.of(WebsocketClientTransport.create(uri));
  }

  @Override
  public Optional buildServer(URI uri) {
    Objects.requireNonNull(uri, "uri must not be null");

    if (SCHEME.stream().noneMatch(scheme -> scheme.equals(uri.getScheme()))) {
      return Optional.empty();
    }

    int port = isSecure(uri) ? getPort(uri, 443) : getPort(uri, 80);

    return Optional.of(WebsocketServerTransport.create(uri.getHost(), port));
  }
}