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AI-assisted engineering/Judgment and tool fit

Fix the payload filter in a checkout error reporter

Review the AI's codeEasy10 min

Your task

An AI built an error reporter for your checkout flow that sends the whole request payload to a third-party monitoring service. That payload holds card numbers, CVVs and email addresses. Your team now sends only the fields on an allowlist and redacts everything else, so a field nobody approved never leaves the process.

An assistant wrote redact_telemetry_payload(payload_pairs, allowed_fields). It is in the editor. It has a bug. Find it and fix it.

Input and output:

  • payload_pairs: the payload's entries, usually written key=value.
  • allowed_fields: the field names approved for telemetry.
  • Return what is sent: one string per entry, in the same order.

Rules the tests check:

  • An entry with no = cannot be checked, so send "[REDACTED]" in its place.
  • Otherwise the key is the text before the first =. If the key matches an allowed field, ignoring case and with nothing trimmed, send the entry unchanged.
  • Otherwise send the key, then =[REDACTED]. The key stays, so engineers can still see which fields were present.

Examples

redact_telemetry_payload(payload_pairs: list[str], allowed_fields: list[str]) -> list[str]
Example 1
Inputredact_telemetry_payload(["orderId=A-1001", "email=ana@example.com", "cardNumber=4111111111111111"], ["orderId", "amount"])
Output["orderId=A-1001", "email=[REDACTED]", "cardNumber=[REDACTED]"]
Example 2
Inputredact_telemetry_payload(["amount=42.50", "cvv=311"], ["amount"])
Output["amount=42.50", "cvv=[REDACTED]"]
Example 3
Inputredact_telemetry_payload(["note=size=large", "token=abc123"], ["note"])
Output["note=size=large", "token=[REDACTED]"]