How to use persistent storage of the HTML5 FileSystem API within webview?

[Dirk Müller]

Is it possible to use persistent storage of the HTML5 FileSystem API from within a webview element?

We built a simple Chromium app, that consists mainly of a HTML file containing a webview element:

<webview src="http://{Host}/index.html" style="width:640px; height:480px" partition="persist:test"></webview>

The manifest.json sets permissions for the webview and unlimitedstorage:

"permissions": [

   "storage",

   "unlimitedStorage",

   "webview"

],

"webview": {

   "partitions": [

      {

         "name":"test",

         "accessible_resources":[""]

      }

   ]

}

We also added an event handler for the permission request to the webview and proved that this code is hit:

webview.addEventListener('permissionrequest', handlePermissionRequest);

function handlePermissionRequest(event) {

   if (event.permission === 'filesystem') {

      // This is called on every request to requestQuota()

      event.request.allow();

   }

}

It's possible to allocate and use temporary storage from the HTML5 FileSystem API in index.html (loaded from http://{Host} into the webview), but we are not able to request any byte of persistent storage. We use this code to test it:

navigator.webkitPersistentStorage.requestQuota(1024, persistentStorageGranted, errorHandler);

function persistentStorageGranted(grantedBytes) {

   // grantedBytes equals 0

   window.requestFileSystem(window.PERSISTENT, requestedBytes, onInitPermanent, errorHandler);

}

Should it be possible to allocate persistent storage (HTML5 FileSystem API) from within the webview element?

Thank you for your help.

[George Pavlovich]

My use case is exactly as above. Has anyone had success using persistent storage of the HTML5 FileSystem API from within a webview element?  My web page (which saves most of its content to the filesytem for offline use) calls navigator.webkitPersistentStorage.requestQuota and receives nothing. When using the event handler suggested above, A webview event 'permissionrequest' is not registered. 

I am attempting to launch my page on a managed chrome device using Single App Kiosk mode which requires a Chrome App which only displays web content in a webview tag. Am I dead in the water?

Great thanks and praise to anyone who can help.

[PhistucK]

Note that Chrome applications are not abandoned on Chrome OS. They are only abandoned on Windows, macOS and Linux.

☆PhistucK

On Thu, May 30, 2019 at 8:23 AM Alireza Jahandideh <ar.jah...@gmail.com> wrote:

I am stuck here too!

Please 

either provide a way to use installed PWAs in kiosk mode in Chrome OS instead of (abondened) Chome Apps 
or let us know how we can provide unlimited storage to a trusted PWA loaded via webview

:-(

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