feature (plugin): handle compression in opener plugin

server/ctrl/plugin.go

@@ -4,6 +4,7 @@ import (
 	"io"
 	"net/http"
 	"os"
+	"strings"
 
 	. "github.com/mickael-kerjean/filestash/server/common"
 	"github.com/mickael-kerjean/filestash/server/model"
@@ -42,16 +43,36 @@ func PluginExportHandler(ctx *App, res http.ResponseWriter, req *http.Request) {
 func PluginStaticHandler(ctx *App, res http.ResponseWriter, req *http.Request) {
 	path := mux.Vars(req)["path"]
 	mtype := GetMimeType(path)
-	file, err := model.GetPluginFile(mux.Vars(req)["name"], path)
-	if err != nil {
-		SendErrorResult(res, err)
-		return
-	}
-	defer file.Close()
-	res.Header().Set("Content-Type", mtype)
-	_, err = io.Copy(res, file)
-	if err != nil {
-		SendErrorResult(res, err)
+	staticConfig := []struct {
+		ContentType string
+		FileExt     string
+	}{
+		{"br", ".br"},
+		{"gzip", ".gz"},
+		{"", ""},
+	}
+
+	var file io.ReadCloser
+	var err error
+	head := res.Header()
+	acceptEncoding := req.Header.Get("Accept-Encoding")
+	for _, cfg := range staticConfig {
+		if strings.Contains(acceptEncoding, cfg.ContentType) == false {
+			continue
+		}
+		file, err = model.GetPluginFile(mux.Vars(req)["name"], path+cfg.FileExt)
+		if err != nil {
+			continue
+		}
+		head.Set("Content-Type", mtype)
+		if cfg.ContentType != "" {
+			head.Set("Content-Encoding", cfg.ContentType)
+		}
+		io.Copy(res, file)
+		file.Close()
 		return
 	}
+
+	SendErrorResult(res, err)
+	return
 }