Migrate AppExt UserDefaults Data to WebExt

Question

lu.xu OP

Created May ’21

Replies 3

Boosts 0

Participants 2

Hi,
I am working on converting my Safari App Extension to Web Extension, I stored some data in App Extension by using

Code Block swiftUserDefaults(suiteName: "my-app-extension")

Now, I am trying to copy all these data to Web Extension background page.
To achieve that, I send a native message from background page, and in the SafariWebExtensionHandler.swift, I tried to use the UserDefaults with the same suiteName, but seems I can't get any data.

Any solution or suggestions to this problem?

Thank you!

Boost

Answer 1

lu.xu OP

May ’21

It is related to using shared UserDefaults among different targets.
To do that, I need to set both the AppExtension and WebExtension to the same app group.
Unfortunately, my AppExtension doesn't have app group before, after I set the AppExtension to an app group ("my-app-extension", same as the suiteName in getting UserDefaults), The AppExtension can't get the previous storages.
Looks it is impossible to resolve the issue.

0

Answer 2

Engineer OP

Apple

May ’21

You might be able to try an intermediate update where you write the contents of your UserDefaults (without an app group) to a file, and then another update where you read the contents of that file (in your App Sandbox) and write it to your newly created app groups's defaults.

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Answer 3

lu.xu OP

May ’21

Thanks bweinstein, that's sounds a plan.

Actually, I tried the FileManager.default, if I can copy files across different targets, e.g, copying the AppExt's UserDefaults file my-app-extension.plist to file:///Users/<username>/Library/Containers/<WebExt bundle identifier>/Data/Library/Preferences, problem is solved. But seems FileManager.default can only operate file in current process files.

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