API: Add file.getBlob() method

Get a W3C `Blob` object which contains the file data.

The file will be fetched from the network with highest priority, and
`callback` will be
called once the file is ready. `callback` must be specified, and will
be called with a an
`Error` (or `null`) and the `Blob` object.

1 files changed, 11 insertions, 2 deletions

diff --git a/lib/file.js b/lib/file.js
index ff19a1c..5f8021c 100644
--- a/lib/file.js
+++ b/lib/file.js
@@ -7,6 +7,7 @@ var inherits = require('inherits')
 var path = require('path')
 var render = require('render-media')
 var stream = require('readable-stream')
+var streamToBlob = require('stream-to-blob')
 var streamToBlobURL = require('stream-to-blob-url')
 var streamToBuffer = require('stream-with-known-length-to-buffer')
 
@@ -74,10 +75,14 @@ File.prototype.getBuffer = function (cb) {
   streamToBuffer(this.createReadStream(), this.length, cb)
 }
 
+File.prototype.getBlob = function (cb) {
+  if (typeof window === 'undefined') throw new Error('browser-only method')
+  streamToBlob(this.createReadStream(), this._getMimeType(), cb)
+}
+
 File.prototype.getBlobURL = function (cb) {
   if (typeof window === 'undefined') throw new Error('browser-only method')
-  var mime = render.mime[path.extname(this.name).toLowerCase()]
-  streamToBlobURL(this.createReadStream(), mime, cb)
+  streamToBlobURL(this.createReadStream(), this._getMimeType(), cb)
 }
 
 File.prototype.appendTo = function (elem, cb) {
@@ -90,6 +95,10 @@ File.prototype.renderTo = function (elem, cb) {
   render.render(this, elem, cb)
 }
 
+File.prototype._getMimeType = function () {
+  return render.mime[path.extname(this.name).toLowerCase()]
+}
+
 File.prototype._destroy = function () {
   this._destroyed = true
   this._torrent = null