84 lines
1.6 KiB
Go
84 lines
1.6 KiB
Go
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package gzip
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import (
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"compress/gzip"
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"fmt"
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"io/ioutil"
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"net/http"
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"path/filepath"
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"strings"
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"sync"
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"github.com/gin-gonic/gin"
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)
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type gzipHandler struct {
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*Options
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gzPool sync.Pool
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}
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func newGzipHandler(level int, options ...Option) *gzipHandler {
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handler := &gzipHandler{
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Options: DefaultOptions,
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gzPool: sync.Pool{
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New: func() interface{} {
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gz, err := gzip.NewWriterLevel(ioutil.Discard, level)
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if err != nil {
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panic(err)
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}
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return gz
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},
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},
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}
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for _, setter := range options {
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setter(handler.Options)
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}
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return handler
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}
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func (g *gzipHandler) Handle(c *gin.Context) {
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if fn := g.DecompressFn; fn != nil && c.Request.Header.Get("Content-Encoding") == "gzip" {
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fn(c)
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}
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if !g.shouldCompress(c.Request) {
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return
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}
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gz := g.gzPool.Get().(*gzip.Writer)
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defer g.gzPool.Put(gz)
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defer gz.Reset(ioutil.Discard)
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gz.Reset(c.Writer)
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c.Header("Content-Encoding", "gzip")
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c.Header("Vary", "Accept-Encoding")
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c.Writer = &gzipWriter{c.Writer, gz}
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defer func() {
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gz.Close()
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c.Header("Content-Length", fmt.Sprint(c.Writer.Size()))
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}()
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c.Next()
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}
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func (g *gzipHandler) shouldCompress(req *http.Request) bool {
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if !strings.Contains(req.Header.Get("Accept-Encoding"), "gzip") ||
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strings.Contains(req.Header.Get("Connection"), "Upgrade") ||
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strings.Contains(req.Header.Get("Accept"), "text/event-stream") {
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return false
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}
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extension := filepath.Ext(req.URL.Path)
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if g.ExcludedExtensions.Contains(extension) {
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return false
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}
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if g.ExcludedPaths.Contains(req.URL.Path) {
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return false
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}
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if g.ExcludedPathesRegexs.Contains(req.URL.Path) {
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return false
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}
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return true
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}
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