Password reset flow that avoids user enumeration and token leaks

                  user = User.find_by(email: params[:email].to_s.downcase.strip)

if user
  raw_token = SecureRandom.urlsafe_base64(32)
  user.password_resets.create!(token_digest: Digest::SHA256.hexdigest(raw_token), expires_at: 30.minutes.from_now)
  PasswordResetMailer.with(user: user, token: raw_token).deliver_later
end

render json: { message: 'If that account exists, reset instructions were sent.' }