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   /*
    * Copyright 2022 The Netty Project
    *
    * The Netty Project licenses this file to you 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:
    *
    *   https://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.netty.handler.ssl.ocsp;
  
  import io.netty.buffer.ByteBufUtil;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.handler.codec.http.FullHttpResponse;
  import io.netty.handler.codec.http.HttpHeaderNames;
  import io.netty.util.concurrent.Promise;
  import io.netty.util.internal.logging.InternalLogger;
  import io.netty.util.internal.logging.InternalLoggerFactory;
  import org.bouncycastle.cert.ocsp.OCSPException;
  import org.bouncycastle.cert.ocsp.OCSPResp;
  
  import static io.netty.handler.codec.http.HttpResponseStatus.OK;
  import static io.netty.util.internal.ObjectUtil.checkNotNull;
  
  final class OcspHttpHandler extends SimpleChannelInboundHandler<FullHttpResponse> {
  
      private static final InternalLogger LOGGER = InternalLoggerFactory.getInstance(OcspHttpHandler.class);
      private final Promise<OCSPResp> responseFuture;
  
      public static final String OCSP_REQUEST_TYPE = "application/ocsp-request";
      public static final String OCSP_RESPONSE_TYPE = "application/ocsp-response";
  
      /**
       * Create new {@link OcspHttpHandler} instance
       *
       * @param responsePromise {@link Promise} of {@link OCSPResp}
       */
      OcspHttpHandler(Promise<OCSPResp> responsePromise) {
          this.responseFuture = checkNotNull(responsePromise, "ResponsePromise");
      }
  
      @Override
      protected void channelRead0(ChannelHandlerContext ctx, FullHttpResponse response) throws Exception {
          try {
              // If DEBUG is enabled then log the response
              if (LOGGER.isDebugEnabled()) {
                  LOGGER.debug("Received OCSP HTTP Response: {}", response);
              }
  
              // Response headers must contain 'Content-Type'
              String contentType = response.headers().get(HttpHeaderNames.CONTENT_TYPE);
              if (contentType == null) {
                  throw new OCSPException("HTTP Response does not contain 'CONTENT-TYPE' header");
              }
  
              // Response headers must contain 'application/ocsp-response'
              if (!contentType.equalsIgnoreCase(OCSP_RESPONSE_TYPE)) {
                  throw new OCSPException("Response Content-Type was: " + contentType +
                          "; Expected: " + OCSP_RESPONSE_TYPE);
              }
  
              // Status must be OK for successful lookup
              if (response.status() != OK) {
                  throw new IllegalArgumentException("HTTP Response Code was: " + response.status().code() +
                          "; Expected: 200");
              }
  
              responseFuture.trySuccess(new OCSPResp(ByteBufUtil.getBytes(response.content())));
          } finally {
              ctx.channel().close();
          }
      }
  
      @Override
      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
          responseFuture.tryFailure(cause);
      }
  }