This document is intended to clarify the Horde Group API, and to provide a solid target for applications to move toward for Horde4. Motivation for this document was spurred from the conversation between the Bens on IRC regarding the "proper" way to handle groups with LDAP.
In its simplest terms a group consists of an ID and a Name. The ID is unique to that group and is unchanging. The name is a human-friendly name that can be changed as desired. The source and/or format of the group ID should not be of concern to the application using it, and should always be obtained/modified/stored through the group API calls. The group ID is the only acceptable method as to refer to a group, as it is guaranteed to be unique (uniqueness being the job of the driver). The group name is strictly for interface use.
Horde 4 will deviate from Horde 3 in these key ways:
In order to help keep concepts straight, the following standards should be used
This is the class that does the work of reading from/saving to the group storage backend.
This class should not be used directly, instead Horde_Group objects are created and used.
Creates a new group and returns a new Horde_Group object.
Changes the name of a group without affecting its membership list
Removes a group from the groups system permanently.
Returns a Horde_Group object based on $name
If the name does not match exactly 1 group (too few or too many) it will raise Horde_Group_Exception with an appropriate error message
Returns Horde_Group object based on the $gid.
Boolean: Check if a group exists in the system.
Returns an array of all groups, in the format gid => name.
Get a list of every user that is a part of this group ONLY.
If $recurse is true then also check member groups' user list.
Returns an array of Horde_Group objects representing the user's membership
Add a user to a group.
Remove a user from a group.
This object represents a group
Returns an instance of a Horde group. If $create is true and the group does not exist, it is created. If $create is false and the group does exist, or if $create is true and the group already exists, a Horde_Group_Exception is raised.