Improve 'set-local-storage-item' — allow modifying nested properties

[scripthunter7]

Currently, only top-level keys can be modified in local storage using the set-local-storage-item scriptlet. However, some applications store data in local storage by saving an object and using nested properties within it.

A good example is help.semmelweis.hu, where the result of the cookie notice is stored under the app key in local storage, specifically within a nested object such as app.consentOptions.analytics.

At the moment, there’s no way to do something like this:

help.semmelweis.hu#%#//scriptlet('set-local-storage-item', 'app.consentOptions.functional', 'true')
help.semmelweis.hu#%#//scriptlet('set-local-storage-item', 'app.consentOptions.analytics', 'false')
help.semmelweis.hu#%#//scriptlet('set-local-storage-item', 'app.consentOptions.marketing', 'false')

For backward compatibility, perhaps the best option would be to add a new parameter that determines whether dots should be interpreted as nesting. The default value of this parameter would be false. There are two main reasons for this:

• currently, both ADG and uBO include an example in their documentation using player.live.current.mute, and
• there are also existing matches for the regex '?set-local-storage-item'?, '?.*\. in both the AdGuard Filters and uAssets.