Collection sharing (WIP)

[Unrud]

Allow sharing of collections between users. Different share modes can be implemented as plugins (e.g. read and write). Plugins can share modified versions of a collection (e.g. an address book as a calendar with birthdays). They can control read and write access to collection properties and can store their own variants (e.g. every user can have his own display name for a shared collection).

• Share plugins
  • Basic support
  • Store private display name and color for every user (and other properties?)
  • Actually implement birthday plugin
• Rights
  • Check if shared collections allow write access to items (currently enforced by assertions)
  • Add new permission to check if a user is allowed to share a collections to a target
• Filesystem
  • Discover shared collections
  • Allow reading and writing of shared collections
  • Allow deletion of shared collections
  • Cache items that are modified by plugins
  • Interface for sharing (and unsharing) a collections
• Webinterface
  • Mark collections that are shared by other users
  • UI for sharing a collection

[Tntdruid]

Very nice!

[Tntdruid]

Any ETA when its done?

[coveralls]

Pull Request Test Coverage Report for Build 874

• 134 of 310 (43.23%) changed or added relevant lines in 18 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-3.6%) to 77.596%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
radicale/main.py	1	3	33.33%
radicale/storage/multifilesystem/init.py	20	22	90.91%
radicale/storage/multifilesystem/delete.py	2	4	50.0%
radicale/share/init.py	24	27	88.89%
radicale/share/birthday.py	10	13	76.92%
radicale/share/read.py	10	13	76.92%
radicale/share/write.py	10	13	76.92%
radicale/storage/multifilesystem/get.py	6	9	66.67%
radicale/storage/multifilesystem/upload.py	7	10	70.0%
radicale/storage/multifilesystem/move.py	13	17	76.47%

Totals
Change from base Build 870:	-3.6%
Covered Lines:	2947
Relevant Lines:	3691

---

💛 - Coveralls

[pbiering]

@Unrud : would it make sense to continue here?

Potentially this would be a way forward related to #1499

[Neustradamus]

@Unrud: Do you progress on your PR?

[pbiering]

@Neustradamus - this PR is based on an older version and I'm unsure whether @Unrud will rebase it to current 3.x version. In case noone else take over, this PR would be canceled next and "archived".

[nicokaiser]

Any news on this? Being able to share collections (calendars) between users properly; read-write and read-only access, per-user collection title, and without needing to manually deal with symlinks or per-collection URLs in clients would be awesome and in my opinion the last missing piece for having a lightweight but powerful solution for CalDAV/CardDAV.

[pbiering]

Any news on this? Being able to share collections (calendars) between users properly; read-write and read-only access, per-user collection title, and without needing to manually deal with symlinks or per-collection URLs in clients would be awesome and in my opinion the last missing piece for having a lightweight but powerful solution for CalDAV/CardDAV.

Nothing happen so far, potentially someone else can take-over.

[pbiering]

Superseeded by #1978