sharing storage key between 2 different extensions?

[Adolfo Rodriguez]

Hi, I want to share an storage key between 2 extensions.

For the extension doing the set this always works with both chrome.storage.sync and chrome.storage.local. Alter message is always shown correctly.

var storage = chrome.storage.sync;

storage.set({'Id': data.Id + ''}, function() {

       storage.get('Id', function(items) {

        alert(items.Id);

       });

});

Code is run from the javascript linked to a html browser_action.

However, for the extension trying to do the get:

var storage = chrome.storage.sync;

        storage.get('Id', function(items) {

        alert(items.Id);

        });

with both, sync and local, I get always a value of 'undefined'. "storage" is defined within the permissions key in manifest. The only thing that makes me wonder is that the get code is placed on the javascript associated to a popup opened from a custom menu. Is it required to be created in the background?

Any idea what is wrong in my configuration?

Thanks

[Benjamin Kalman]

Unless "data.Id" is undefined in your example, it looks like it should work. Could you file a bug with repro steps and a simple extension and assign to me?

Cheers,

Ben.

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[Adolfo Rodriguez]

Done. Thanks Issue 173576

[Jeffrey Yasskin]

https://code.google.com/p/chromium/codesearch/#chrome/src/chrome/browser/extensions/api/storage/sync_or_local_value_store_cache.cc&l=69
implies to me that chrome.storage is per-extension and there's no way
to share storage between extensions. Also, allowing that sharing would
seem to be a security hole. Am I missing something?

[Benjamin Kalman]

Heh, I missed the 2 different extensions part, I read it as 2 different places within the one extension.

Storage is very definitely isolated between extensions, there is no way to share data.

[James Mortensen]

If you can postMessage between two extensions, then you could sync up the storage in both extensions.  Just a thought....

James

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Project Manager, VoiceCurve, Inc.
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[Abraham Williams]

You can send messages between extensions. Making sure that data between the two extensions are synced and accurate will be up to you however.

https://developer.chrome.com/extensions/messaging.html#external

Abraham
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[Adolfo Rodriguez]

Thanks all for this great analysis. 

I did not know that storage runs in a per extension protected space. Not sure about the security hole since it can be left up to the developer to choose the right scope and decide if he want to share the data or nor. But not a big deal if it does not work like that.

Kalman, can you please close the issue then? Issue 173576

Thanks for your great feedback

[Benjamin Kalman]

It's not a security hole: sharing data via postMessage (as others have suggested in this thread) is an explicit collaboration between two extensions, whereas making storage a shared area between all extensions would be implicit and a world of pain and confusion.