I want to disable file access within an Android WebView I'm creating using react-native's built-in WebView component.

The Android WebView docs say "File access is enabled by default.", and this is a security concern for my organization.

The react-native 0.31 docs mention a getWebViewHandle method that can be used to access the underlying WebView node; if this worked, then I could (presumably) write:

import { WebView, Platform } from 'react-native';
//...
var reactWebview = <Webview [props here] />
if (Platform.OS === 'android') {
    var webview = reactWebview.getWebViewHandle();
    console.log(webview.getAllowFileAccess()); // check AllowFileAccess setting
    webview.setAllowFileAccess(false); // disable file access
}

However, later versions of the react-native docs don't mention getWebViewHandle, and when I run code like this in react-native 0.44 on an Android device, I get this error:

webview.getWebViewHandle is not a function.

My questions are:

1. How can we check if file access is enabled by default for the Android WebViews created by react-native's WebView component?

2. How can we disable this file access? Would we need to extend the WebView class, or fork and modify react-native?

Thanks for your time!