Url encode the display name

fixes #901

util/magnet.go

@@ -2,13 +2,14 @@ package util
 
 import (
 	"fmt"
+	"net/url"
 )
 
 // InfoHashToMagnet : convert a binary infohash to a magnet uri given a display name and tracker urls
 func InfoHashToMagnet(ih string, name string, trackers ...string) (str string) {
 	str = fmt.Sprintf("magnet:?xt=urn:btih:%s", ih)
 	if len(name) > 0 {
-		str += fmt.Sprintf("&dn=%s", name)
+		str += fmt.Sprintf("&dn=%s", url.QueryEscape(name))
 	}
 	for idx := range trackers {
 		str += fmt.Sprintf("&tr=%s", trackers[idx])