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/*
 *
 * Copyright (c) 2013 - 2018 Lijun Liao
 *
 * 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 org.xipki.http.servlet;

import java.io.IOException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLSession;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;

/**
 * TODO.
 * @author Lijun Liao
 * @since 2.2.0
 */

public abstract class AbstractHttpServlet implements HttpServlet {

  @Override
  public boolean needsTlsSessionInfo() {
    return false;
  }

  protected static byte[] readContent(FullHttpRequest request) {
    ByteBuf buf = request.content();
    if (buf == null) {
      return null;
    }
    byte[] bytes = new byte[buf.readableBytes()];
    buf.getBytes(buf.readerIndex(), bytes);
    return bytes;
  }

  // CHECKSTYLE:SKIP
  protected static FullHttpResponse createOKResponse(HttpVersion version, String contentType,
      byte[] content) {
    return createResponse(version, HttpResponseStatus.OK, contentType, content);
  }

  protected static FullHttpResponse createResponse(HttpVersion version,
      HttpResponseStatus status, String contentType, byte[] content) {
    FullHttpResponse resp;
    ByteBuf buf = null;
    int contentLen = (content == null) ? 0 : content.length;

    if (contentLen != 0) {
      buf = Unpooled.wrappedBuffer(content);
      resp = new DefaultFullHttpResponse(version, status, buf);
    } else {
      resp = new DefaultFullHttpResponse(version, status);
    }
    resp.headers().addInt("Content-Length", contentLen);

    if (contentType != null && !contentType.isEmpty()) {
      resp.headers().add("Content-Type", contentType);
    }
    return resp;
  }

  protected static FullHttpResponse createErrorResponse(HttpVersion version,
      HttpResponseStatus status) {
    FullHttpResponse resp = new DefaultFullHttpResponse(version, status);
    resp.headers().addInt("Content-Length", 0);
    return resp;
  }

  protected X509Certificate getClientCert(HttpRequest request, SSLSession sslSession,
      SslReverseProxyMode sslReverseProxyMode) throws IOException {
    return TlsHelper.getTlsClientCert(request, sslSession, sslReverseProxyMode);
  }

}