108 lines
2.4 KiB
Go
108 lines
2.4 KiB
Go
package github
|
|
|
|
import (
|
|
"bytes"
|
|
"github.com/caddyserver/caddy/v2"
|
|
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
|
|
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
|
|
"github.com/chai2010/webp"
|
|
"golang.org/x/image/bmp"
|
|
"image"
|
|
"image/jpeg"
|
|
"image/png"
|
|
"io"
|
|
"log"
|
|
"net/http"
|
|
"strings"
|
|
)
|
|
|
|
const Quality = 80
|
|
|
|
func init() {
|
|
log.Println("webp plugin")
|
|
err := caddy.RegisterModule(Webp{})
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
httpcaddyfile.RegisterHandlerDirective("webp", parseCaddyfile)
|
|
}
|
|
|
|
func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
|
|
return Webp{}, nil
|
|
}
|
|
|
|
type Webp struct {
|
|
}
|
|
|
|
func (Webp) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
Name: "http.handlers.webp",
|
|
New: func() caddy.Module { return new(Webp) },
|
|
}
|
|
}
|
|
|
|
func (s Webp) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
|
|
ua := r.Header.Get("User-Agent")
|
|
if strings.Contains(ua, "Safari") && !strings.Contains(ua, "Chrome") && !strings.Contains(ua, "Firefox") {
|
|
return next.ServeHTTP(w, r) // 对Safari禁用webp
|
|
}
|
|
resp := &response{}
|
|
err := next.ServeHTTP(resp, r)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ct := http.DetectContentType(resp.Body.Bytes())
|
|
|
|
//fmt.Println("file len", resp.Body.Len(), "file type", ct)
|
|
|
|
var decoder func(io.Reader) (image.Image, error)
|
|
if strings.Contains(ct, "jpeg") {
|
|
decoder = jpeg.Decode
|
|
} else if strings.Contains(ct, "png") {
|
|
decoder = png.Decode
|
|
} else if strings.Contains(ct, "bmp") {
|
|
decoder = bmp.Decode
|
|
// } else if strings.HasSuffix(r.URL.String(), ".gif") { TODO need to support animated webp
|
|
// decoder = gif.Decode
|
|
} else {
|
|
return next.ServeHTTP(w, r)
|
|
}
|
|
|
|
img, err := decoder(bytes.NewReader(resp.Body.Bytes()))
|
|
if err != nil || img == nil {
|
|
log.Println(err)
|
|
return next.ServeHTTP(w, r)
|
|
}
|
|
var buf bytes.Buffer
|
|
err = webp.Encode(&buf, img, &webp.Options{Lossless: false, Quality: Quality})
|
|
if err != nil {
|
|
log.Println(err)
|
|
return next.ServeHTTP(w, r)
|
|
}
|
|
w.Header().Set("Content-Type", "image/webp")
|
|
w.WriteHeader(http.StatusOK)
|
|
_, err = w.Write(buf.Bytes())
|
|
if err != nil {
|
|
log.Println(err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type response struct {
|
|
header http.Header
|
|
Body bytes.Buffer
|
|
}
|
|
|
|
func (s *response) Header() http.Header {
|
|
return http.Header{}
|
|
}
|
|
|
|
func (s *response) Write(data []byte) (int, error) {
|
|
s.Body.Write(data)
|
|
return len(data), nil
|
|
}
|
|
func (s *response) WriteHeader(i int) {
|
|
return
|
|
}
|