Mock Firefox OS Device Storage API. Note that now we only mock enumerate() method here.

device-storage.coffee

# -----------------------------------------------------------------------------
# UTILS
# -----------------------------------------------------------------------------
convertBase64ToBinary = (base64) ->
	raw = window.atob base64
	rawLength = raw.length
	array = new Uint8Array(new ArrayBuffer(rawLength))
	i = 0

	while i < rawLength
		array[i] = raw.charCodeAt(i)
		i++

	return array

# -----------------------------------------------------------------------------
# CLASSES
# -----------------------------------------------------------------------------

# Cursor class
# ------------------------
class Cursor
	ix : -1
	results : {}

	constructor: (blobs) ->
		@blobs = blobs

		@__defineGetter__ 'result', =>
			@results[@.ix]

	continue : =>
		ix = ++@.ix
		blob = @blobs[Object.keys(@blobs)[ix]]

		if not blob
			@results[ix] = null
			@done = true
			setTimeout =>
				@onsuccess()
			return

		decoded = new Blob([convertBase64ToBinary(blob)], type: 'image/png')
		decoded.name = "file#{ix}.png"
		decoded.lastModifiedDate = new Date()

		@results[ix] = decoded

		setTimeout =>
			@onsuccess()

# Cursor class
# ------------------------
class DeviceStorage
	constructor: (mediaType, blobs) ->
		defaultBlobs =
			'file0.png' : 'iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAABbSURBVCjPY/jPgB8yDCkFB/7v+r/5/+r/i/7P+N/3DYuC7V93/d//fydQ0Zz/9eexKFgtsejLiv8b/8/8X/WtUBGrGyZLdH6f8r/sW64cTkdWSRS+zpQbgiEJAI4UCqdRg1A6AAAAAElFTkSuQmCC'
			'file1.png' : 'iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAABbSURBVCjPY/jPgB8yDCkFB/7v+r/5/+r/i/7P+N/3DYuC7V93/d//fydQ0Zz/9eexKFgtsejLiv8b/8/8X/WtUBGrGyZLdH6f8r/sW64cTkdWSRS+zpQbgiEJAI4UCqdRg1A6AAAAAElFTkSuQmCC'

		@mediaType = mediaType
		@blobs = blobs or defaultBlobs

	enumerate : ->
		cursor = new Cursor(@blobs)

		cont = ->
			cursor.continue()

		setTimeout cont, 1000

		return cursor

# -----------------------------------------------------------------------------
# SHIM INIT
# -----------------------------------------------------------------------------
getDeviceStorage = (mediaType) ->
	new DeviceStorage(mediaType)

window.navigator.__defineGetter__ 'getDeviceStorage', ->
	getDeviceStorage