optional mimetype param to getBlobURL

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/storage.js b/lib/storage.js
index 04f5b57..3d9f50b 100644
--- a/lib/storage.js
+++ b/lib/storage.js
@@ -275,13 +275,16 @@ File.prototype.createReadStream = function (opts) {
  * the future.
  * @param {function} cb
  */
-File.prototype.getBlobURL = function (cb) {
+File.prototype.getBlobURL = function (cb, mimetype) {
   var self = this
   if (typeof window === 'undefined') throw new Error('browser-only method')
 
   self.getBuffer(function (err, buffer) {
     if (err) return cb(err)
-    var url = window.URL.createObjectURL(new window.Blob([ buffer ]))
+    var blob = mimetype
+      ? new window.Blob([ buffer ], { type: mimetype })
+      : new window.Blob([ buffer ])
+    var url = window.URL.createObjectURL(blob)
     cb(null, url)
   })
 }