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middleware.go
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/
middleware.go
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/*
* Copyright 2023 Wang Min Xiang
*
* Licensed 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
*
* http://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 compress
import (
"bytes"
"github.com/aacfactory/errors"
"github.com/aacfactory/fns/commons/bytex"
"github.com/aacfactory/fns/transports"
"github.com/aacfactory/logs"
"github.com/valyala/fasthttp"
"slices"
)
var (
strApplicationSlash = []byte("application/")
strImageSVG = []byte("image/svg")
strImageIcon = []byte("image/x-icon")
strFontSlash = []byte("font/")
strMultipartSlash = []byte("multipart/")
strTextSlash = []byte("text/")
)
const (
minCompressLen = 200
)
func New() transports.Middleware {
return &Middleware{}
}
type Middleware struct {
log logs.Logger
enable bool
compressor Compressor
gzip *GzipCompressor
deflate *DeflateCompressor
brotli *BrotliCompressor
}
func (middle *Middleware) Name() string {
return "compress"
}
func (middle *Middleware) Construct(options transports.MiddlewareOptions) error {
middle.log = options.Log
config := Config{}
configErr := options.Config.As(&config)
if configErr != nil {
return errors.Warning("fns: construct compress middleware failed").WithCause(configErr)
}
if !config.Enable {
return nil
}
// gzip
gzipLevel := config.GzipLevel
if !slices.Contains([]int{fasthttp.CompressBestSpeed, fasthttp.CompressBestCompression, fasthttp.CompressDefaultCompression, fasthttp.CompressHuffmanOnly}, gzipLevel) {
gzipLevel = fasthttp.CompressDefaultCompression
}
middle.gzip = &GzipCompressor{
level: gzipLevel,
}
// deflate
deflateLevel := config.DeflateLevel
if !slices.Contains([]int{fasthttp.CompressBestSpeed, fasthttp.CompressBestCompression, fasthttp.CompressDefaultCompression, fasthttp.CompressHuffmanOnly}, deflateLevel) {
deflateLevel = fasthttp.CompressDefaultCompression
}
middle.deflate = &DeflateCompressor{
level: deflateLevel,
}
// brotli
brotliLevel := config.BrotliLevel
if !slices.Contains([]int{fasthttp.CompressBrotliBestSpeed, fasthttp.CompressBrotliBestCompression, fasthttp.CompressBrotliDefaultCompression}, brotliLevel) {
brotliLevel = fasthttp.CompressBrotliDefaultCompression
}
middle.brotli = &BrotliCompressor{
level: brotliLevel,
}
switch config.Default {
case BrotliName:
middle.compressor = middle.brotli
break
case DeflateName:
middle.compressor = middle.deflate
break
case GzipName:
middle.compressor = middle.gzip
break
default:
middle.compressor = middle.deflate
break
}
middle.enable = true
return nil
}
func (middle *Middleware) Handler(next transports.Handler) transports.Handler {
if middle.enable {
return transports.HandlerFunc(func(w transports.ResponseWriter, r transports.Request) {
next.Handle(w, r)
if w.BodyLen() < minCompressLen {
return
}
contentType := w.Header().Get(transports.ContentTypeHeaderName)
canCompress := bytes.HasPrefix(contentType, strTextSlash) ||
bytes.HasPrefix(contentType, strApplicationSlash) ||
bytes.HasPrefix(contentType, strImageSVG) ||
bytes.HasPrefix(contentType, strImageIcon) ||
bytes.HasPrefix(contentType, strFontSlash) ||
bytes.HasPrefix(contentType, strMultipartSlash)
if !canCompress {
return
}
kind := getKind(r)
var c Compressor = nil
switch kind {
case Any, Default:
c = middle.compressor
break
case Gzip:
c = middle.gzip
break
case Deflate:
c = middle.deflate
break
case Brotli:
c = middle.brotli
break
default:
break
}
if c == nil {
return
}
body := w.Body()
compressed, compressErr := c.Compress(body)
if compressErr != nil {
if middle.log.WarnEnabled() {
middle.log.Warn().Cause(compressErr).With("compress", kind.String()).Message("fns: compress response body failed")
}
return
}
// header
w.Header().Set(transports.ContentEncodingHeaderName, bytex.FromString(c.Name()))
w.Header().Add(transports.VaryHeaderName, transports.AcceptEncodingHeaderName)
// body
w.ResetBody()
_, _ = w.Write(compressed)
})
}
return next
}
func (middle *Middleware) Close() (err error) {
return
}