jcoffey-dev
92d14fbd60
Phase 2b of the DLP and mail flow rules spec: every identifier in the §2.3 catalog, each implemented from its issuer's published rules and tested against published examples. US (SSN, ITIN, EIN, ABA routing, driver's licenses, MBI, NPI, DEA), UK (NI number, NHS number, UTR), Canada (SIN), Australia (TFN, Medicare), the EU (Germany's tax ID and ID card, France's NIR, Spain's DNI/NIE, Italy's codice fiscale, the Dutch BSN, Belgium's national number, Poland's PESEL, Sweden's personnummer, Denmark's CPR, Finland's HETU, Ireland's PPS, Portugal's NIF, Austria's SVNR), Norway, Switzerland, India (Aadhaar, PAN), China, Japan, Singapore, South Korea, Brazil (CPF, CNPJ), Mexico (CURP) and South Africa. 49 detectors in all, plus seven templates named for what they find. An identifier that is only digits and whose check about one random number in ten passes counts alone only in its written form (536-22-1234, 943 476 5919) and as bare digits only beside a word; ABA routing numbers and NPIs always need one. Spec §2.3 records this. A test runs every detector over an ordinary business email (order, invoice and tracking numbers, dates, amounts, an address) and requires nothing to fire but the contact detectors. 47 unit tests.
50 lines
1.4 KiB
Rust
50 lines
1.4 KiB
Rust
/*
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* SPDX-FileCopyrightText: 2026 Coffey Labs
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*
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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//! African identifiers (§2.3): South Africa's ID number.
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use super::{Detector, Findings, Region, Strength, checks, valid_short_date};
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use regex::Regex;
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use std::sync::LazyLock;
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pub static DETECTORS: &[Detector] = &[Detector::new(
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"za-id",
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"South Africa: ID number",
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Region::Africa,
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Strength::Checked,
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za_id,
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)];
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/// Birth date `YYMMDD`, four digits, citizenship (0, 1 or 2), 8 or 9, a Luhn
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/// check digit. The date and the two fixed digits make it strong enough to
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/// count alone.
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static ZA_ID: LazyLock<Regex> = LazyLock::new(|| {
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Regex::new(r"\b(\d{2})(\d{2})(\d{2})\d{4}[012][89]\d\b").expect("detector pattern")
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});
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fn za_id(text: &str, findings: &mut Findings) {
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for c in ZA_ID.captures_iter(text) {
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let n = &c[0];
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let num = |s: &str| s.parse::<u32>().unwrap_or(0);
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if valid_short_date(num(&c[1]), num(&c[2]), num(&c[3])) && checks::luhn(n) {
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findings.insert(n);
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::mailflow::detectors::by_id;
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#[test]
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fn south_africa() {
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let detector = by_id("za-id").unwrap();
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assert_eq!(detector.count("ID 8001015009087"), 1);
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assert_eq!(detector.count("8001015009088"), 0);
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assert_eq!(detector.count("8013015009087"), 0);
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}
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}
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