Improve vfsgen to not unzip bindata files but send to browser directly

go.mod

@@ -87,6 +87,7 @@ require (
 	github.com/quasoft/websspi v1.0.0
 	github.com/sergi/go-diff v1.1.0
 	github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749 // indirect
+	github.com/shurcooL/httpgzip v0.0.0-20190720172056-320755c1c1b0
 	github.com/shurcooL/vfsgen v0.0.0-20200824052919-0d455de96546
 	github.com/spf13/viper v1.7.1 // indirect
 	github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf // indirect

go.sum

@@ -986,6 +986,8 @@ github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24 h1:pntxY8Ary0t4
 github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24/go.mod h1:M+9NzErvs504Cn4c5DxATwIqPbtswREoFCre64PpcG4=
 github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749 h1:bUGsEnyNbVPw06Bs80sCeARAlK8lhwqGyi6UT8ymuGk=
 github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749/go.mod h1:ZY1cvUeJuFPAdZ/B6v7RHavJWZn2YPVFQ1OSXhCGOkg=
+github.com/shurcooL/httpgzip v0.0.0-20190720172056-320755c1c1b0 h1:mj/nMDAwTBiaCqMEs4cYCqF7pO6Np7vhy1D1wcQGz+E=
+github.com/shurcooL/httpgzip v0.0.0-20190720172056-320755c1c1b0/go.mod h1:919LwcH0M7/W4fcZ0/jy0qGght1GIhqyS/EgWGH2j5Q=
 github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/shurcooL/vfsgen v0.0.0-20200824052919-0d455de96546 h1:pXY9qYc/MP5zdvqWEUH6SjNiu7VhSjuVFTFiTcphaLU=

modules/public/public.go

@@ -5,14 +5,20 @@
 package public
 
 import (
+	"bytes"
+	"compress/gzip"
+	"io"
 	"log"
+	"mime"
 	"net/http"
 	"path"
 	"path/filepath"
 	"strings"
 
 	"code.gitea.io/gitea/modules/httpcache"
 	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/shurcooL/httpgzip"
 )
 
 // Options represents the available options to configure the macaron handler.
@@ -157,6 +163,29 @@ func (opts *Options) handle(w http.ResponseWriter, req *http.Request, opt *Optio
 		return true
 	}
 
+	if _, ok := f.(httpgzip.NotWorthGzipCompressing); !ok {
+		if g, ok := f.(httpgzip.GzipByter); ok {
+			w.Header().Set("Content-Encoding", "gzip")
+			rd := bytes.NewReader(g.GzipBytes())
+			ctype := mime.TypeByExtension(filepath.Ext(fi.Name()))
+			if ctype == "" {
+				// read a chunk to decide between utf-8 text and binary
+				var buf [512]byte
+				grd, _ := gzip.NewReader(rd)
+				n, _ := io.ReadFull(grd, buf[:])
+				ctype = http.DetectContentType(buf[:n])
+				_, err := rd.Seek(0, io.SeekStart) // rewind to output whole file
+				if err != nil {
+					log.Printf("rd.Seek error: %v\n", err)
+					return false
+				}
+			}
+			w.Header().Set("Content-Type", ctype)
+			http.ServeContent(w, req, file, fi.ModTime(), rd)
+			return true
+		}
+	}
+
 	http.ServeContent(w, req, file, fi.ModTime(), f)
 	return true
 }