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Quentin Gliech
6094cc873d
Exposes a new query telling whether a given username is available for registration, and if not, why: already taken, or rejected by the registration policy. A username reserved on the homeserver side is deliberately reported as taken, mirroring the ambiguity of the registration form, which doesn't tell the two apart either. Because this effectively is a username-existence oracle, the query is rate-limited per requester, configurable through the new `rate_limiting.username_availability` option.