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42 lines
842 B
42 lines
842 B
# frozen_string_literal: true
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class SuspiciousSignInDetector
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IPV6_TOLERANCE_MASK = 64
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IPV4_TOLERANCE_MASK = 16
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def initialize(user)
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@user = user
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end
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def suspicious?(request)
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!sufficient_security_measures? && !freshly_signed_up? && !previously_seen_ip?(request)
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end
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private
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def sufficient_security_measures?
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@user.otp_required_for_login?
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end
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def previously_seen_ip?(request)
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@user.ips.where('ip <<= ?', masked_ip(request)).exists?
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end
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def freshly_signed_up?
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@user.current_sign_in_at.blank?
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end
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def masked_ip(request)
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masked_ip_addr = begin
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ip_addr = IPAddr.new(request.remote_ip)
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if ip_addr.ipv6?
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ip_addr.mask(IPV6_TOLERANCE_MASK)
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else
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ip_addr.mask(IPV4_TOLERANCE_MASK)
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end
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end
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"#{masked_ip_addr}/#{masked_ip_addr.prefix}"
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end
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end
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