Cache webcal calendars in browser's local storage

owncloud / calendar

Calendar app for ownCloud

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Cache webcal calendars in browser's local storage #364

Open georgehrke opened 8 years ago

georgehrke commented 8 years ago

in addition to: https://github.com/owncloud/calendar/issues/132

cache (not password protected) webcal subscriptions using HTML5 Browser Storage.

needs discussion about security:

users with the same browser profile might be able to read the locale storage. Potentially dangerous when webcal subscription contains private data. (e.g. Facebook provides a webcal (url contains hash) with the events you attend or you saved)
- can we add something like "on logout" scripts to clear locale storage when a user logs out?
- Is there some easy way to encrypt the data?

georgehrke commented 8 years ago

cc @LukasReschke

DeepDiver1975 commented 8 years ago

this way any webcal is only available in the web app - I'd expect them in any connected caldav client as well. can subscription help us with this respect?

georgehrke commented 8 years ago

As far as I understood CalDAV subscriptions its only meant to store the actual link and not the objects itself. Is this wrong?

DeepDiver1975 commented 8 years ago

As far as I understood CalDAV subscriptions its only meant to store the actual link and not the objects itself. Is this wrong?

I was hoping you already know more about this :sob: :wink:

georgehrke commented 8 years ago

it's already pretty hard to find some documentation about it. Can you link me to the standard?

georgehrke commented 8 years ago

According to this sabre file it's only a list.

Searching the web for CalDAV managed subscriptions or "{http://apple.com/ns/ical/}refresh rate" didn't turn up anything useful :confused:

I begin to question this standard's existence :sob:

georgehrke commented 8 years ago

https://github.com/fruux/sabre-dav/blob/master/tests/Sabre/CalDAV/Subscriptions/CreateSubscriptionTest.php#L19L39

Although this still doesn't explain whether or not the server is supposed to cache the objects or if it's really just a list of subscriptions

georgehrke commented 8 years ago

Maybe @evert can enlighten us :laughing:

evert commented 8 years ago

It's just a list of subscriptions. Although a server-side cache might be cool =)

I don't think a spec exists. I believe I just reverse-engineered it.

georgehrke commented 8 years ago

I don't think a spec exists.

Haha, that explains a lot :see_no_evil:

Thx a lot :)

georgehrke commented 8 years ago

@DeepDiver1975 For now I'll implement webcal in the client only as planned for 1.1.

If anything caching webcal and propagating them to clients as ordinary calendars would go into ownCloud 9.1.

tcitworld commented 8 years ago

What would be used as encryption key if we were to encrypt the local storage saved calendars ?