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110 lines
4.9 KiB
ReStructuredText
110 lines
4.9 KiB
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============
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File Sharing
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============
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Nextcloud users can share files with their Nextcloud groups and other users on
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the same Nextcloud server, with Nextcloud users on :doc:`other Nextcloud servers <federated_cloud_sharing_configuration>`, and create public shares for people who are not
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Nextcloud users. You have control of a number of user permissions on file shares:
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* Allow users to share files
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* Allow users to create public shares
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* Require a password on public shares
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* Allow public uploads to public shares
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* Require an expiration date on public share links
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* Allow resharing
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* Restrict sharing to group members only
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* Allow email notifications of new public shares
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* Exclude groups from creating shares
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.. note:: Nextcloud includes a Share Link Password Policy app; see
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:ref:`password_policy_label`.
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Configure your sharing policy on your Admin page in the Sharing section.
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.. figure:: images/sharing-files-1.png
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* Check ``Allow apps to use the Share API`` to enable users to share files. If
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this is not checked, no users can create file shares.
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* Check ``Allow users to share via link`` to enable creating public shares for
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people who are not Nextcloud users via hyperlink.
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* Check ``Enforce password protection`` to force users to set a password on all
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public share links. This does not apply to local user and group shares.
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* Check ``Allow public uploads`` to allow anyone to upload files to
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public shares.
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* Check ``Allow users to send mail notification for shared files`` to enable
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sending notifications from Nextcloud. (Your Nextcloud server must be configured
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to send mail)
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* Check ``Set default expiration date`` to set a default expiration date on
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public shares.
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* Check ``Allow resharing`` to enable users to re-share files shared with them.
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* Check ``Restrict users to only share with users in their groups`` to confine
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sharing within group memberships.
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.. note:: This setting does not apply to the Federated Cloud sharing
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feature. If :doc:`Federated Cloud Sharing
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<federated_cloud_sharing_configuration>` is
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enabled, users can still share items with any users on any instances
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(including the one they are on) via a remote share.
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* Check ``Allow users to send mail notification for shared files`` enables
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users to send an email notification to every Nextcloud user that the file is
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shared with.
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* Check ``Exclude groups from sharing`` to prevent members of specific groups
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from creating any file shares in those groups. When you check this, you'll
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get a dropdown list of all your groups to choose from. Members of excluded
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groups can still receive shares, but not create any
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* Check ``Allow username autocompletion in share dialog`` to enable
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auto-completion of Nextcloud usernames.
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.. note:: Nextcloud does not preserve the mtime (modification time) of
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directories, though it does update the mtimes on files. See
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`Wrong folder date when syncing
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<https://github.com/owncloud/core/issues/7009>`_ for discussion of this.
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.. _transfer_userfiles_label:
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Transferring Files to Another User
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----------------------------------
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You may transfer files from one user to another with ``occ``. This is useful
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when you have to remove a user. Be sure to transfer the files before you delete
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the user! This transfers all files from user1 to user2, and the shares and
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metadata info associated with those files (shares, tags, comments, etc).
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Trashbin contents are not transferred::
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occ files:transfer-ownership user1 user2
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(See :doc:`../configuration_server/occ_command` for a complete ``occ``
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reference.)
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Creating Persistent File Shares
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-------------------------------
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When a user is deleted, their files are also deleted. As you can imagine, this
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is a problem if they created file shares that need to be preserved, because
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these disappear as well. In Nextcloud files are tied to their owners, so
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whatever happens to the file owner also happens to the files.
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One solution is to create persistent shares for your users. You can retain
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ownership of them, or you could create a special user for the purpose of
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establishing permanent file shares. Simply create a shared folder in the usual
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way, and share it with the users or groups who need to use it. Set the
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appropriate permissions on it, and then no matter which users come and go, the
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file shares will remain. Because all files added to the share, or edited in it,
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automatically become owned by the owner of the share regardless of who adds or
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edits them.
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.. _password_policy_label:
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Share Link Password Policy
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--------------------------
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Nextcloud users have the option of enabling the Share Link Password
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Policy app. This allows you to enforce password length, required characters,
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define special characters, and expiration dates on share links.
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.. figure:: images/sharing-files-2.png
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Note that you cannot use Emojis as special characters with MySQL, as it
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supports UTF8 characters only of 1-3 bytes, and emojis require 4 bytes.
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