better detect file mime type

weed/filesys/filehandle.go

@@ -4,12 +4,9 @@ import (
 	"context"
 	"fmt"
 	"math"
-	"mime"
-	"path"
+	"net/http"
 	"time"
 
-	"github.com/gabriel-vasile/mimetype"
-
 	"github.com/chrislusf/seaweedfs/weed/filer2"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
@@ -130,12 +127,7 @@ func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *f
 
 	if req.Offset == 0 {
 		// detect mime type
-		detectedMIME := mimetype.Detect(data)
-		fh.contentType = detectedMIME.String()
-		if ext := path.Ext(fh.f.Name); ext != detectedMIME.Extension() {
-			fh.contentType = mime.TypeByExtension(ext)
-		}
-
+		fh.contentType = http.DetectContentType(data)
 		fh.dirtyMetadata = true
 	}
 

weed/operation/upload_content.go

@@ -77,6 +77,12 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 	contentIsGzipped := isInputGzipped
 	shouldGzipNow := false
 	if !isInputGzipped {
+		if mtype == "" {
+			mtype = http.DetectContentType(data)
+			if mtype == "application/octet-stream" {
+				mtype = ""
+			}
+		}
 		if shouldBeZipped, iAmSure := util.IsGzippableFileType(filepath.Base(filename), mtype); iAmSure && shouldBeZipped {
 			shouldGzipNow = true
 		} else if !iAmSure && mtype == "" && len(data) > 128 {