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defmodule WalletAuth.Commands.VerifyOtpChallenge do |
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@moduledoc """ |
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OTP challenge verification command. |
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Per checklist Track C: |
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- Verifies code against stored challenge (timing-safe). |
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- Tracks attempt count and locks out after max_attempts. |
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- Emits `OtpChallengeVerified` on success. |
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- Emits `SuspiciousActivityDetected` on exhaustion. |
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""" |
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alias WalletAuth.Otp.OtpStore |
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alias WalletAuth.Events.{OtpChallengeVerified, SuspiciousActivityDetected} |
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alias WalletObservability.AuditEvent |
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@type purpose :: WalletAuth.Otp.OtpStore.purpose() |
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@doc """ |
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Verifies the OTP code for a user/purpose. |
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Returns `{:ok, :verified}` or |
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`{:error, :invalid_code | :exhausted | :expired | :not_found}`. |
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""" |
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@spec execute(user_id :: String.t(), purpose(), code :: String.t(), keyword()) :: |
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{:ok, :verified} | {:error, :invalid_code | :exhausted | :expired | :not_found} |
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:-( |
def execute(user_id, purpose, code, opts \\ []) do |
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:-( |
correlation_id = Keyword.get(opts, :correlation_id, WalletSharedKernel.Correlation.new_correlation_id()) |
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:-( |
ip = Keyword.get(opts, :ip_address) |
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:-( |
case OtpStore.verify_challenge(user_id, purpose, code) do |
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{:ok, :verified} -> |
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:-( |
audit = AuditEvent.build(:auth, "otp_verified", "user", user_id, :success, |
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correlation_id: correlation_id, |
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metadata: %{purpose: purpose} |
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) |
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:-( |
:telemetry.execute([:wallet_auth, :audit], %{}, audit) |
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:-( |
event = OtpChallengeVerified.build(user_id, purpose, correlation_id: correlation_id) |
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:-( |
emit_event(event) |
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{:ok, :verified} |
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{:error, :exhausted} = err -> |
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:-( |
audit = AuditEvent.build(:auth, "otp_exhausted", "user", user_id, :failure, |
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correlation_id: correlation_id, |
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metadata: %{purpose: purpose, ip_address: ip} |
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) |
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:-( |
:telemetry.execute([:wallet_auth, :audit], %{}, audit) |
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:-( |
event = SuspiciousActivityDetected.build(user_id, :otp_exhausted, |
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correlation_id: correlation_id, |
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ip_address: ip |
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) |
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:-( |
emit_event(event) |
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:-( |
err |
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{:error, _reason} = err -> |
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:-( |
err |
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end |
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end |
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:-( |
defp emit_event(event) do |
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pubsub = Application.get_env(:wallet_auth, :pubsub, WalletWeb.PubSub) |
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apply(Phoenix.PubSub, :broadcast, [pubsub, "wallet_auth:events", {:domain_event, event}]) |
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rescue |
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:-( |
_ -> :ok |
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end |
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end |