👋👤 Allow users to enter out-of-office info, propagate to Calendar, user status, Mail and Talk

[ChristophWurst]

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Is your feature request related to a problem? Please describe.

As a Nextcloud user I want to have a central place where I can enter my unavailability for vacation, sick leave or other. The info should be used to let my family, friends or colleagues know that I'm not here to respond to their messages.

Describe the solution you'd like

Add a new section to the existing availability settings in the personal settings. Let me enter the following details:

• Absence message (multi line free text)
• Status text (single line)
• Start of absence (inclusive)
• End of absence (inclusive)

Based on the input above, do

1. Write an event to my calendar so I show as busy when someone tries to book a meeting
2. Set my user status to the status text and do-no-disturb at the start of the absence, reset when it ends
3. Set my Mail app account(s) auto responder to the date range and the absence message at the start of the absence, reset when it ends
4. Show the absence message inside 1:1 chats when others try to reach me

Acceptance criteria

• Global admin config to disable the feature

Work packages

• Out-of-office: Implement settings UI with persistence in database #40616
• Out-of-office: Expose data via OCP/OCS APIs #40650
• Create personal event for out of office messages #41337
• Out-of-office: Update user status #41378
• Out-of-office: Apply user info to auto responder settings (if enabled) mail#8925
• Show out-of-office message in 1:1 conversations spreed#10599
• Out of office docs for admins documentation#11332
• Out of office docs for users documentation#11333

Follow-ups

• Ask to end out-of-office if user logs in before the end date #40560
• Out of office: expose setting endpoint via OCS #41458

Additional info

This is an MVP. The big picture is tracked in #31607.

[nickvergessen]

• Would be helpful to also show it on the profile (maybe optional, so users can select "only people that are logged in" in case they post direct phone numbers

[nickvergessen]

• As lead/manager/sysadmin I would also think it's helpful to be able to set it for other people (via API or OCC), in case they can not return to set it themselves.

[ChristophWurst]

As lead/manager/sysadmin I would also think it's helpful to be able to set it for other people (via API or OCC), in case they can not return to set it themselves.

Agree: #38523