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The Async Http Client (AHC) classes.
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/*
 * Copyright (c) 2015 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.netty.handler.intercept;

import io.netty.channel.Channel;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.cookie.ClientCookieDecoder;
import io.netty.handler.codec.http.cookie.Cookie;
import org.asynchttpclient.*;
import org.asynchttpclient.cookie.CookieStore;
import org.asynchttpclient.netty.NettyResponseFuture;
import org.asynchttpclient.netty.channel.ChannelManager;
import org.asynchttpclient.netty.request.NettyRequestSender;
import org.asynchttpclient.proxy.ProxyServer;

import static io.netty.handler.codec.http.HttpHeaderNames.SET_COOKIE;
import static org.asynchttpclient.util.HttpConstants.ResponseStatusCodes.*;

public class Interceptors {

  private final AsyncHttpClientConfig config;
  private final Unauthorized401Interceptor unauthorized401Interceptor;
  private final ProxyUnauthorized407Interceptor proxyUnauthorized407Interceptor;
  private final Continue100Interceptor continue100Interceptor;
  private final Redirect30xInterceptor redirect30xInterceptor;
  private final ConnectSuccessInterceptor connectSuccessInterceptor;
  private final ResponseFiltersInterceptor responseFiltersInterceptor;
  private final boolean hasResponseFilters;
  private final ClientCookieDecoder cookieDecoder;

  public Interceptors(AsyncHttpClientConfig config,
                      ChannelManager channelManager,
                      NettyRequestSender requestSender) {
    this.config = config;
    unauthorized401Interceptor = new Unauthorized401Interceptor(channelManager, requestSender);
    proxyUnauthorized407Interceptor = new ProxyUnauthorized407Interceptor(channelManager, requestSender);
    continue100Interceptor = new Continue100Interceptor(requestSender);
    redirect30xInterceptor = new Redirect30xInterceptor(channelManager, config, requestSender);
    connectSuccessInterceptor = new ConnectSuccessInterceptor(channelManager, requestSender);
    responseFiltersInterceptor = new ResponseFiltersInterceptor(config, requestSender);
    hasResponseFilters = !config.getResponseFilters().isEmpty();
    cookieDecoder = config.isUseLaxCookieEncoder() ? ClientCookieDecoder.LAX : ClientCookieDecoder.STRICT;
  }

  public boolean exitAfterIntercept(Channel channel,
                                    NettyResponseFuture future,
                                    AsyncHandler handler,
                                    HttpResponse response,
                                    HttpResponseStatus status,
                                    HttpHeaders responseHeaders) throws Exception {

    HttpRequest httpRequest = future.getNettyRequest().getHttpRequest();
    ProxyServer proxyServer = future.getProxyServer();
    int statusCode = response.status().code();
    Request request = future.getCurrentRequest();
    Realm realm = request.getRealm() != null ? request.getRealm() : config.getRealm();

    // This MUST BE called before Redirect30xInterceptor because latter assumes cookie store is already updated
    CookieStore cookieStore = config.getCookieStore();
    if (cookieStore != null) {
      for (String cookieStr : responseHeaders.getAll(SET_COOKIE)) {
        Cookie c = cookieDecoder.decode(cookieStr);
        if (c != null) {
          // Set-Cookie header could be invalid/malformed
          cookieStore.add(future.getCurrentRequest().getUri(), c);
        }
      }
    }

    if (hasResponseFilters && responseFiltersInterceptor.exitAfterProcessingFilters(channel, future, handler, status, responseHeaders)) {
      return true;
    }

    if (statusCode == UNAUTHORIZED_401) {
      return unauthorized401Interceptor.exitAfterHandling401(channel, future, response, request, realm, httpRequest);

    } else if (statusCode == PROXY_AUTHENTICATION_REQUIRED_407) {
      return proxyUnauthorized407Interceptor.exitAfterHandling407(channel, future, response, request, proxyServer, httpRequest);

    } else if (statusCode == CONTINUE_100) {
      return continue100Interceptor.exitAfterHandling100(channel, future);

    } else if (Redirect30xInterceptor.REDIRECT_STATUSES.contains(statusCode)) {
      return redirect30xInterceptor.exitAfterHandlingRedirect(channel, future, response, request, statusCode, realm);

    } else if (httpRequest.method() == HttpMethod.CONNECT && statusCode == OK_200) {
      return connectSuccessInterceptor.exitAfterHandlingConnect(channel, future, request, proxyServer);

    }
    return false;
  }
}