howdy/auth/providers/facebook

Facebook Login server flow. Facebook has no OpenID Connect: the code is exchanged for an access token and identity comes from Graph /me. That endpoint never asserts that the shared address is owned or verified, so the identity is recorded as unauthoritative: a new account still needs an email Howdy verified itself, or an explicit link from an existing account. No Facebook tokens are stored or returned.

pub fn new(
  client_id client_id: String,
  client_secret client_secret: String,
) -> provider.Provider