Forum banning of member

Background

Banning user accounts, possibly for a limited period of time, is a standard feature on a lot of forums, despite the fact that users are able to make new accounts and post again. This still is a meaningful feature because people lose the ability to post under a given personae, which is often very valuable.

Proposal

Allow forum lead to ban and unban other members. Bans can be perpetual, or they can be for a limited time.

Implementation

Probably easiest to just bake this into the forum pallet by adding a new map memberid => BanStatus, where

enum BanStatus {
Perpetual,
UntilBlock(BlockNumber) /// after this block, you are effectively no longer banned, however you have to remove mapping from map first.
}

and then add

• set_ban_status(origin, member_id, BanStatus): only callable by forum lead, and where
• remove_ban(origin, member_id): callable by banned member to remove a block which has expired, and is required before this member can do anything.

┆Issue is synchronized with this Asana task by Unito

Start by locating the forum pallet and reading its existing member permissions and block-number handling. Compare the proposed BanStatus map, set_ban_status, and remove_ban behavior with the pallet's current extrinsics. Done means forum leads can apply perpetual or time-limited bans, expired members can clear them, and banned members cannot act until then.