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Implement GzipServerMiddleware

tags/v1.0.0
Matthias Neeracher 4 years ago
parent
commit
6b2983cbbb
1 changed files with 42 additions and 52 deletions
  1. +42
    -52
      Sources/GzipMiddleware/GzipMiddleware.swift

+ 42
- 52
Sources/GzipMiddleware/GzipMiddleware.swift View File

@@ -1,47 +1,15 @@
import HTTP
import Vapor
import gzip
import Foundation

public enum GzipMiddlewareError: Error {
case unsupportedStreamType
}

/// Client Gzip middlere:
/// 1. sets the "Accept-Encoding" header to "gzip"
/// 2. if the response has "Content-Encoding" == "gzip", uncompresses the body
public struct GzipClientMiddleware: Middleware {

public init() { }

public func respond(to request: Request, chainingTo next: Responder) throws -> Response {

request.headers["Accept-Encoding"] = "gzip"

let response = try next.respond(to: request)

guard response.headers["Content-Encoding"] == "gzip" else {
return response
}

let zipped = response.body
switch zipped {
case .data(let bytes):
response.body = .data(Array(try Data(bytes: bytes).gzipUncompressed()))
case .chunked(let chunker):
response.body = .chunked({ (stream: ChunkStream) in
let gzipStream = try GzipStream(mode: .uncompress, stream: stream.raw)
try chunker(ChunkStream(stream: gzipStream))
})
}
return response
}
}
import ZIPFoundation

/// Server Gzip middlere:
/// 1. checks if the "Accept-Encoding" header contains "gzip"
/// 2. if so, compresses the body and sets the response header "Content-Encoding" to "gzip",
public struct GzipServerMiddleware: Middleware {
public struct GzipServerMiddleware: Middleware, ServiceType {
public static func makeService(for worker: Container) throws -> GzipServerMiddleware {
return .init()
}

private let shouldGzip: (_ request: Request) -> Bool

@@ -51,26 +19,48 @@ public struct GzipServerMiddleware: Middleware {
self.shouldGzip = shouldGzip
}

public func respond(to request: Request, chainingTo next: Responder) throws -> Response {

let acceptsGzip = request.headers["Accept-Encoding"]?.contains("gzip") == true
public func respond(to request: Request, chainingTo next: Responder) throws -> EventLoopFuture<Response> {
let acceptsGzip = request.http.headers[.acceptEncoding].first?.contains("gzip") ?? false
guard acceptsGzip && shouldGzip(request) else {
return try next.respond(to: request)
}

let response = try next.respond(to: request)
response.headers["Content-Encoding"] = "gzip"

let unzipped = response.body
switch unzipped {
case .data(let bytes):
response.body = .data(Array(try Data(bytes: bytes).gzipCompressed()))
case .chunked(let chunker):
response.body = .chunked({ (stream: ChunkStream) in
let gzipStream = try GzipStream(mode: .compress, stream: stream.raw)
try chunker(ChunkStream(stream: gzipStream))
})
return response.flatMap { response in
var headers = response.http.headers
headers.replaceOrAdd(name: .contentEncoding, value: "gzip")
return response.http.body.consumeData(on: request).map { data in
let stream = HTTPChunkedStream(on: request)
let bufSize = 4096
var buffer = ByteBufferAllocator().buffer(capacity: bufSize)
let header : [UInt8] = [0x1f, 0x8b, 0x08, 0x00]
let header2 : [UInt8] = [0x00, 0x03]
buffer.write(bytes: header)
buffer.write(integer: UInt32(Date().timeIntervalSince1970), endianness: .little)
buffer.write(bytes: header2)
var write = stream.write(.chunk(buffer))
let crc32 = try Data.compress(size: data.count, bufferSize: bufSize,
provider: {(offset, readSize) -> Data in
return data.subdata(in: offset..<offset+readSize)
},
consumer: { data -> Void in
write = write.flatMap {
buffer.clear()
buffer.write(bytes: data)
return stream.write(.chunk(buffer))
}
})
write.always {
buffer.clear()
buffer.write(integer: crc32, endianness: .little)
buffer.write(integer: UInt32(data.count), endianness: .little)
stream.write(.chunk(buffer)).always {
_ = stream.write(.end)
}
}
let httpResponse = HTTPResponse(status: response.http.status, headers: headers, body: stream)
return request.response(http: httpResponse)
}
}
return response
}
}

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