67 lines
1.8 KiB
Ruby
67 lines
1.8 KiB
Ruby
class OidcAuthorizationCode < ApplicationRecord
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belongs_to :application
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belongs_to :user
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attr_accessor :plaintext_code
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before_validation :generate_code, on: :create
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before_validation :set_expiry, on: :create
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validates :code_hmac, presence: true, uniqueness: true
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validates :redirect_uri, presence: true
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validates :code_challenge_method, inclusion: { in: %w[plain S256], allow_nil: true }
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validate :validate_code_challenge_format, if: -> { code_challenge.present? }
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scope :valid, -> { where(used: false).where("expires_at > ?", Time.current) }
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scope :expired, -> { where("expires_at <= ?", Time.current) }
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# Find authorization code by plaintext code using HMAC verification
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def self.find_by_plaintext(plaintext_code)
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return nil if plaintext_code.blank?
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code_hmac = compute_code_hmac(plaintext_code)
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find_by(code_hmac: code_hmac)
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end
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# Compute HMAC for code lookup
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def self.compute_code_hmac(plaintext_code)
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OpenSSL::HMAC.hexdigest('SHA256', TokenHmac::KEY, plaintext_code)
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end
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def expired?
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expires_at <= Time.current
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end
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def usable?
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!used? && !expired?
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end
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def consume!
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update!(used: true)
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end
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def uses_pkce?
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code_challenge.present?
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end
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private
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def generate_code
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# Generate random plaintext code
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self.plaintext_code ||= SecureRandom.urlsafe_base64(32)
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# Store HMAC in database (not plaintext)
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self.code_hmac ||= self.class.compute_code_hmac(plaintext_code)
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end
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def set_expiry
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self.expires_at ||= 10.minutes.from_now
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end
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def validate_code_challenge_format
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# PKCE code challenge should be base64url-encoded, 43-128 characters
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unless code_challenge.match?(/\A[A-Za-z0-9\-_]{43,128}\z/)
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errors.add(:code_challenge, "must be 43-128 characters of base64url encoding")
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end
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end
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end
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