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Ask Homeserver for username availability upon registration #2421
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Fixes #2376
Whenever MAS register a user, from the registration form, the upstream OAuth 2.0 registration or the GraphQL API, it now ask the homeserver whether the username is available.
This makes sure a user doesn't accidentally register with a username used by an internal account or by an application service.
This check can be bypassed on the GraphQL API by administrators using the new
skipHomeserverCheck
flag.This can be reviewed commit-by-commit.