kiosk app external usb access

[bruce4vic]

Hi,

I am new to Chromes OS and have written a NFC enabled kiosk app and installed it on my managed Chromebit so that it enters kiosk mode on boot.

This is working well.

I would now like to have the app load html files from an external usb device rather than the cloud due to large files, video etc. something like 

<webview src='files://USB Drive/Video1/index.html'></webview>  is what I have in mind.

I have read up on the fileSystem API and that it is supported for kiosk apps running in kiosk mode, but I cannot get it to work.

The below code results in the error shown.

chrome.fileSystem.getVolumeList(function(volumes)

  {

  if (volumes === undefined)

  {

  log("Error: " + JSON.stringify(chrome.runtime.lastError));

  }

  else

  {

  $.each(volumes, function(i, v){

  log("Volume: " + v.volumeid + ", Writable: " + v.writable);

  });

  // Request Filesystem

  log("Requesting filesystem...");

  chrome.fileSystem.requestFileSystem(volumes[0].volumeid, function(fs) {

  if (fs === undefined)

  {

  log("Error: " + JSON.stringify(chrome.runtime.lastError));

  }

  else

  {

  log(JSON.stringify(fs));

  }

  });

  }

  });

and the error:

Error: {"message":"Operation only supported for kiosk apps running in a kiosk session."}

My app is a kiosk app running in a kiosk session!

My manifest is as follows:

{

  "name": "****",

  "version": "0.1",

  "description": "****",

  "manifest_version": 2,

  "icons": {

      "128": "icon_128.png",

      "16": "icon_16.png"

    },

  "permissions": [

    "usb",

    {

      "usbDevices": [

        { "vendorId": 1839, "productId": 8704 } // This is the NFC USB reader

      ]

    },

    "webview",

    "audio",

    "enterprise.deviceAttributes",

    "power",

    "unlimitedStorage",

    {"fileSystem": ["write", "retainEntries", "directory", "requestFileSystem"] }

  ],

  "app": {

    "background": {

      "scripts": [ "background.js" ]

    }

  },

  "kiosk_enabled": true

}

Any help on have my kiosk app load html content from an external USB would be greatly appreciated.