/*
    * Copyright 2019 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.codec.http.websocketx;
  
  import io.netty.util.internal.ObjectUtil;
  
  /**
   * Frames decoder configuration.
   */
  public final class WebSocketDecoderConfig {
  
      static final WebSocketDecoderConfig DEFAULT =
          new WebSocketDecoderConfig(65536, true, false, false, true, true);
  
      private final int maxFramePayloadLength;
      private final boolean expectMaskedFrames;
      private final boolean allowMaskMismatch;
      private final boolean allowExtensions;
      private final boolean closeOnProtocolViolation;
      private final boolean withUTF8Validator;
  
      /**
       * Constructor
       *
       * @param maxFramePayloadLength
       *            Maximum length of a frame's payload. Setting this to an appropriate value for you application
       *            helps check for denial of services attacks.
       * @param expectMaskedFrames
       *            Web socket servers must set this to true processed incoming masked payload. Client implementations
       *            must set this to false.
       * @param allowMaskMismatch
       *            Allows to loosen the masking requirement on received frames. When this is set to false then also
       *            frames which are not masked properly according to the standard will still be accepted.
       * @param allowExtensions
       *            Flag to allow reserved extension bits to be used or not
       * @param closeOnProtocolViolation
       *            Flag to send close frame immediately on any protocol violation.ion.
       * @param withUTF8Validator
       *            Allows you to avoid adding of Utf8FrameValidator to the pipeline on the
       *            WebSocketServerProtocolHandler creation. This is useful (less overhead)
       *            when you use only BinaryWebSocketFrame within your web socket connection.
       */
      private WebSocketDecoderConfig(int maxFramePayloadLength, boolean expectMaskedFrames, boolean allowMaskMismatch,
                                    boolean allowExtensions, boolean closeOnProtocolViolation,
                                    boolean withUTF8Validator) {
          this.maxFramePayloadLength = maxFramePayloadLength;
          this.expectMaskedFrames = expectMaskedFrames;
          this.allowMaskMismatch = allowMaskMismatch;
          this.allowExtensions = allowExtensions;
          this.closeOnProtocolViolation = closeOnProtocolViolation;
          this.withUTF8Validator = withUTF8Validator;
      }
  
      public int maxFramePayloadLength() {
          return maxFramePayloadLength;
      }
  
      public boolean expectMaskedFrames() {
          return expectMaskedFrames;
      }
  
      public boolean allowMaskMismatch() {
          return allowMaskMismatch;
      }
  
      public boolean allowExtensions() {
          return allowExtensions;
      }
  
      public boolean closeOnProtocolViolation() {
          return closeOnProtocolViolation;
      }
  
      public boolean withUTF8Validator() {
          return withUTF8Validator;
      }
  
      @Override
      public String toString() {
          return "WebSocketDecoderConfig" +
              " [maxFramePayloadLength=" + maxFramePayloadLength +
              ", expectMaskedFrames=" + expectMaskedFrames +
              ", allowMaskMismatch=" + allowMaskMismatch +
              ", allowExtensions=" + allowExtensions +
              ", closeOnProtocolViolation=" + closeOnProtocolViolation +
              ", withUTF8Validator=" + withUTF8Validator +
             "]";
     }
 
     public Builder toBuilder() {
         return new Builder(this);
     }
 
     public static Builder newBuilder() {
         return new Builder(DEFAULT);
     }
 
     public static final class Builder {
         private int maxFramePayloadLength;
         private boolean expectMaskedFrames;
         private boolean allowMaskMismatch;
         private boolean allowExtensions;
         private boolean closeOnProtocolViolation;
         private boolean withUTF8Validator;
 
         private Builder(WebSocketDecoderConfig decoderConfig) {
             ObjectUtil.checkNotNull(decoderConfig, "decoderConfig");
             maxFramePayloadLength = decoderConfig.maxFramePayloadLength();
             expectMaskedFrames = decoderConfig.expectMaskedFrames();
             allowMaskMismatch = decoderConfig.allowMaskMismatch();
             allowExtensions = decoderConfig.allowExtensions();
             closeOnProtocolViolation = decoderConfig.closeOnProtocolViolation();
             withUTF8Validator = decoderConfig.withUTF8Validator();
         }
 
         public Builder maxFramePayloadLength(int maxFramePayloadLength) {
             this.maxFramePayloadLength = maxFramePayloadLength;
             return this;
         }
 
         public Builder expectMaskedFrames(boolean expectMaskedFrames) {
             this.expectMaskedFrames = expectMaskedFrames;
             return this;
         }
 
         public Builder allowMaskMismatch(boolean allowMaskMismatch) {
             this.allowMaskMismatch = allowMaskMismatch;
             return this;
         }
 
         public Builder allowExtensions(boolean allowExtensions) {
             this.allowExtensions = allowExtensions;
             return this;
         }
 
         public Builder closeOnProtocolViolation(boolean closeOnProtocolViolation) {
             this.closeOnProtocolViolation = closeOnProtocolViolation;
             return this;
         }
 
         public Builder withUTF8Validator(boolean withUTF8Validator) {
             this.withUTF8Validator = withUTF8Validator;
             return this;
         }
 
         public WebSocketDecoderConfig build() {
             return new WebSocketDecoderConfig(
                     maxFramePayloadLength, expectMaskedFrames, allowMaskMismatch,
                     allowExtensions, closeOnProtocolViolation, withUTF8Validator);
         }
     }
 }