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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2022 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 NIOCore
/// A ChannelHandler to validate that outbound request headers are spec-compliant.
///
/// The HTTP RFCs constrain the bytes that are validly present within a HTTP/1.1 header block.
/// ``NIOHTTPRequestHeadersValidator`` polices this constraint and ensures that only valid header blocks
/// are emitted on the network. If a header block is invalid, then ``NIOHTTPRequestHeadersValidator``
/// will send a ``HTTPParserError/invalidHeaderToken``.
///
/// ``NIOHTTPRequestHeadersValidator`` will also valid that the HTTP trailers are within specification,
/// if they are present.
public final class NIOHTTPRequestHeadersValidator: ChannelOutboundHandler, RemovableChannelHandler {
public typealias OutboundIn = HTTPClientRequestPart
public typealias OutboundOut = HTTPClientRequestPart
public init() { }
public func write(context: ChannelHandlerContext, data: NIOAny, promise: EventLoopPromise<Void>?) {
switch self.unwrapOutboundIn(data) {
case .head(let head):
guard head.headers.areValidToSend else {
promise?.fail(HTTPParserError.invalidHeaderToken)
context.fireErrorCaught(HTTPParserError.invalidHeaderToken)
return
}
case .body, .end(.none):
()
case .end(.some(let trailers)):
guard trailers.areValidToSend else {
promise?.fail(HTTPParserError.invalidHeaderToken)
context.fireErrorCaught(HTTPParserError.invalidHeaderToken)
return
}
}
context.write(data, promise: promise)
}
}
/// A ChannelHandler to validate that outbound response headers are spec-compliant.
///
/// The HTTP RFCs constrain the bytes that are validly present within a HTTP/1.1 header block.
/// ``NIOHTTPResponseHeadersValidator`` polices this constraint and ensures that only valid header blocks
/// are emitted on the network. If a header block is invalid, then ``NIOHTTPResponseHeadersValidator``
/// will send a ``HTTPParserError/invalidHeaderToken``.
///
/// ``NIOHTTPResponseHeadersValidator`` will also valid that the HTTP trailers are within specification,
/// if they are present.
public final class NIOHTTPResponseHeadersValidator: ChannelOutboundHandler, RemovableChannelHandler {
public typealias OutboundIn = HTTPServerResponsePart
public typealias OutboundOut = HTTPServerResponsePart
public init() { }
public func write(context: ChannelHandlerContext, data: NIOAny, promise: EventLoopPromise<Void>?) {
switch self.unwrapOutboundIn(data) {
case .head(let head):
guard head.headers.areValidToSend else {
promise?.fail(HTTPParserError.invalidHeaderToken)
context.fireErrorCaught(HTTPParserError.invalidHeaderToken)
return
}
case .body, .end(.none):
()
case .end(.some(let trailers)):
guard trailers.areValidToSend else {
promise?.fail(HTTPParserError.invalidHeaderToken)
context.fireErrorCaught(HTTPParserError.invalidHeaderToken)
return
}
}
context.write(data, promise: promise)
}
}
@available(*, unavailable)
extension NIOHTTPRequestHeadersValidator: Sendable {}
@available(*, unavailable)
extension NIOHTTPResponseHeadersValidator: Sendable {}
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