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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import NIO
/// A simple `ChannelHandler` that catches protocol errors emitted by the
/// `WebSocketFrameDecoder` and automatically generates protocol error responses.
///
/// This `ChannelHandler` provides default error handling for basic errors in the
/// WebSocket protocol, and can be used by users when custom behaviour is not required.
public final class WebSocketProtocolErrorHandler: ChannelInboundHandler {
public typealias InboundIn = Never
public typealias OutboundOut = WebSocketFrame
public init() { }
public func errorCaught(context: ChannelHandlerContext, error: Error) {
if let error = error as? NIOWebSocketError {
var data = context.channel.allocator.buffer(capacity: 2)
data.write(webSocketErrorCode: WebSocketErrorCode(error))
let frame = WebSocketFrame(fin: true,
opcode: .connectionClose,
data: data)
context.writeAndFlush(self.wrapOutboundOut(frame)).whenComplete { (_: Result<Void, Error>) in
context.close(promise: nil)
}
}
// Regardless of whether this is an error we want to handle or not, we always
// forward the error on to let others see it.
context.fireErrorCaught(error)
}
}
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