* Guarding against spam from OAuth Sources
Prior to this commit, when an administrator had indicated blocked email
domains, those blocks were not applied to identities created via the
OAuth sources (e.g., Twitter, Facebook, etc). With this change, we're
hooking into the similar logic flow as suspended email accounts.
Related to #15403, #15397, and forem/rfcs#281
* Adding class documentation to exception
* Update app/services/authentication/authenticator.rb
Co-authored-by: Ridhwana <Ridhwana.Khan16@gmail.com>
Co-authored-by: Ridhwana <Ridhwana.Khan16@gmail.com>
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