DAV Support for Contacts & Calendar
Enabling DAV support for Contacts & Calendar would be a huge improvement for Proton users. I would like to be able to sync my contacts and calendars with one another across devices, especially Android contacts.
Currently, I'm using DAVx5 to sync my contacts & calendar w/Nextcloud.
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burnersk
commented
Proton Mail comes with great features like an address book (Contacts) within Proton Mail and Proton Calendar.
However, due to the privacy nature of zero knowledge (encryption), Proton cannot offer a way to provide their own CardDAV endpoint without either storing the (encrypted) secret/encryption key in their database (bad) or relying on the client to submit the secret/encryption key in every request (very bad).
I use a Nextcloud service to synchronize my contacts and appointments via CardDAV and CalDAV across several endpoint device classes. For example my dedicated VoIP phones, routers with VoIP servers inside, smartphones, and email clients.
On the smartphone there is no issue, because the Proton Mail mobile client offers a combined address book (contacts). While there is no synchronization between the Proton contacts and the smartphone contacts, the mobile app can access both.
The issue comes when using the desktop client or the web client. Here there is no combined address book (contacts). Only the Proton-native contacts are known. I can solve this via exporting my main address book as an VCard and import them in to Proton Mail contacts, but this also raises issues (mainly duplicates, and excessive personal efforts which could be used better).
My solution to the issue: Allow the Proton Mail desktop client to subscribe to an CardDAV endpoint and synchronize this endpoint (both directions) with the Proton Mail native address book (contacts).
Proton Mail desktop client should not provide an CardDAV endpoint, but consume/subscribe to an external CardDAV endpoint.This way, I do not waste my time in manual synchronization and deduplication.
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Alex Noffsinger
commented
not having CardDAV will ensure i don't waste my money and renew next year. i felt dumb for not researching before i purchased. my whole point was to move away from other providers only to find out one of the simplest and critical items isn't available to sync
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Adri
commented
CalDAV is a standard protocol. It would be great for many Proton users to have this feature for those who don't have the choice of keeping a third-party calendar (e.g. professional) and for whom it is not at all practical and viable to have several applications to view their calendars separately. For many Proton users, it would be great and very practical to be able to group their calendars via the CalDAV protocol in a single application ;)