Multiple Email addresses

Allow users to set multiple email addresses, and select one as primary address. Confirmation via link is required. Additional addresses are being considered in e.g. share dialogues.

• \OC(P)\Accounts\ components are extended to support multi-value properties in general and emails in particular https://github.com/nextcloud/server/pull/27189

• \OCA\Settings\Controller\UsersController methods are discontinued in favor of User Provisining API. Currently they exist in parallel. The User Provisioning API has to be extended accordingly https://github.com/nextcloud/server/pull/27474

• \OCA\DAV\CardDAV\Converter::createCardFromUser has to be extended to support additional multiple values

• Mail verification has to be implemented (following the password reset, same mechanisms) – part of https://github.com/nextcloud/server/pull/28422

• coniguration option for setting notification mails and UI controls – https://github.com/nextcloud/server/pull/28422 and https://github.com/nextcloud/server/pull/28840

• Email uniquness cannot be guaranteed through DB structure (for they are not unique and would potentially break setups). It is ensured when creating and verifying additional email addresses.

  • don' insert an email when one is already known (not safe of race conditions)
    • when an email is confirmed, ensure that the same pending addresses are removed (handling a potential race condition)
    • And when an email is introduced by the user backend:
    • if the additional address state is…
      • not verified: → remove it
      • verified:
        • same user: remove additional i.e. remove duplicate
        • different user: write to audit log (this is then something only the admin can resolve)

• occ commands for adding and removing mails; and making one primary

• Frontend email section in Vue with Integration https://github.com/nextcloud/server/pull/27379

• Preserve order and scope of additional emails

  • When updating an additional email address the order is not preserved
  • Scope is also not preserved for the updated email