fix serve attachment content type

cmd/web.go

@@ -338,9 +338,19 @@ func runWeb(ctx *cli.Context) {
 				return
 			}
 
+			fr, err := os.Open(attach.LocalPath())
+			if err != nil {
+				ctx.Handle(500, "Open", err)
+				return
+			}
+			defer fr.Close()
+
 			// Fix #312. Attachments with , in their name are not handled correctly by Google Chrome.
 			// We must put the name in " manually.
-			ctx.ServeFileContent(attach.LocalPath(), "\""+attach.Name+"\"")
+			if err = repo.ServeData(ctx, "\""+attach.Name+"\"", fr); err != nil {
+				ctx.Handle(500, "ServeData", err)
+				return
+			}
 		})
 		m.Post("/issues/attachments", repo.UploadIssueAttachment)
 	}, ignSignIn)

routers/repo/download.go

@@ -13,14 +13,9 @@ import (
 	"github.com/gogits/gogs/modules/middleware"
 )
 
-func ServeBlob(ctx *middleware.Context, blob *git.Blob) error {
-	dataRc, err := blob.Data()
-	if err != nil {
-		return err
-	}
-
+func ServeData(ctx *middleware.Context, name string, reader io.Reader) error {
 	buf := make([]byte, 1024)
-	n, _ := dataRc.Read(buf)
+	n, _ := reader.Read(buf)
 	if n > 0 {
 		buf = buf[:n]
 	}
@@ -39,8 +34,17 @@ func ServeBlob(ctx *middleware.Context, blob *git.Blob) error {
 		}
 	}
 	ctx.Resp.Write(buf)
-	_, err = io.Copy(ctx.Resp, dataRc)
+	_, err := io.Copy(ctx.Resp, reader)
+	return err
+}
+
+func ServeBlob(ctx *middleware.Context, blob *git.Blob) error {
+	dataRc, err := blob.Data()
+	if err != nil {
 		return err
+	}
+
+	return ServeData(ctx, ctx.Repo.TreeName, dataRc)
 }
 
 func SingleDownload(ctx *middleware.Context) {