mirror of
https://github.com/apple/swift-nio-extras.git
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0584020dca
### Motivation: There will be times when a client wishes to send larger requests with gzipped bodies to save on network traffic. This PR adds a `NIOHTTPRequestDecompressor` which can be added to the server's channel pipeline so those requests are automatically inflated. ### Modifications: - Added a `CNIOExtrasZlib_voidPtr_to_BytefPtr` C method. - Added a `NIOHTTPRequestDecompressor` type. - Added a `HTTPResponseDecompressorTest` test case. ### Result: Now you don't have to manually check the `Content-Encoding` header and decompress the body on each incoming request.
85 lines
3.0 KiB
Swift
85 lines
3.0 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the SwiftNIO open source project
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//
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// Copyright (c) 2019 Apple Inc. and the SwiftNIO project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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import CNIOExtrasZlib
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import NIOHTTP1
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import NIO
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public final class NIOHTTPRequestDecompressor: ChannelDuplexHandler, RemovableChannelHandler {
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public typealias InboundIn = HTTPServerRequestPart
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public typealias InboundOut = HTTPServerRequestPart
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public typealias OutboundIn = HTTPServerResponsePart
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public typealias OutboundOut = HTTPServerResponsePart
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private struct Compression {
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let algorithm: NIOHTTPDecompression.CompressionAlgorithm
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let contentLength: Int
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}
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private var decompressor: NIOHTTPDecompression.Decompressor
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private var compression: Compression?
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public init(limit: NIOHTTPDecompression.DecompressionLimit) {
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self.decompressor = NIOHTTPDecompression.Decompressor(limit: limit)
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self.compression = nil
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}
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public func channelRead(context: ChannelHandlerContext, data: NIOAny) {
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let request = self.unwrapInboundIn(data)
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switch request {
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case .head(let head):
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if
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let encoding = head.headers[canonicalForm: "Content-Encoding"].first?.lowercased(),
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let algorithm = NIOHTTPDecompression.CompressionAlgorithm(header: encoding),
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let length = head.headers[canonicalForm: "Content-Length"].first.flatMap({ Int($0) })
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{
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do {
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try self.decompressor.initializeDecoder(encoding: algorithm, length: length)
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self.compression = Compression(algorithm: algorithm, contentLength: length)
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} catch let error {
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context.fireErrorCaught(error)
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return
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}
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}
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context.fireChannelRead(data)
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case .body(var part):
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guard let compression = self.compression else {
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context.fireChannelRead(data)
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return
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}
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while part.readableBytes > 0 {
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do {
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var buffer = context.channel.allocator.buffer(capacity: 16384)
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try self.decompressor.decompress(part: &part, buffer: &buffer, originalLength: compression.contentLength)
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context.fireChannelRead(self.wrapInboundOut(.body(buffer)))
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} catch let error {
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context.fireErrorCaught(error)
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return
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}
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}
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case .end:
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if self.compression != nil {
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self.decompressor.deinitializeDecoder()
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self.compression = nil
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}
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context.fireChannelRead(data)
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}
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}
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}
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