From 6682a51050840b05d898f6f6bc3d34640603c828 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jimmy=20W=C3=A4rting?= <jimmy@warting.se>
Date: Fri, 19 Apr 2019 16:50:22 +0200
Subject: [PATCH] discard bad mime types per spec

---
 Blob.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Blob.js b/Blob.js
index df7dd43..247a2a1 100644
--- a/Blob.js
+++ b/Blob.js
@@ -358,7 +358,14 @@
         ? concatTypedarrays(chunks)
         : [].concat.apply([], chunks)
       this.size = this._buffer.length
-      this.type = opts ? opts.type || '' : ''
+
+      this.type = opts.type || ''
+      if (/[^\u0020-\u007E]/.test(this.type)) {
+        this.type = ''
+      } else {
+        this.type = this.type.toLowerCase()
+      }
+
     }
 
     Blob.prototype.slice = function (start, end, type) {