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lib/sustainability.js

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  1. // LEASH wallet-control — basic merchant sustainability lookup.
  2. //
  3. // Scope (deliberately minimal, demo-grade): a static, hand-curated score per
  4. // shop domain in data/sustainability.json — one number + a one-line note per
  5. // merchant. Not a certification feed. Guarantees mirror the rest of the
  6. // evidence layer:
  7. // - Evidence only. Sustainability NEVER approves, declines, or reorders a
  8. // payment decision; it informs the customer's merchant choice when the
  9. // "prefer sustainable shops" option is on (offer comparison + suggestion).
  10. // - Never fabricated: a shop without data is reported as band "unknown",
  11. // never guessed from its name, category, or country.
  12. // - Deterministic: same input → same output, no network, no model.
  14. import fs from 'node:fs';
  15. import { normalizeDomain } from './trustedshops.js';
  17. /** Load the static dataset into a Map(domain → {score, note}). A missing or
  18. * broken file yields an empty index (every lookup degrades to "unknown"),
  19. * never a crash. Malformed entries are skipped, not guessed. */
  20. export function loadSustainabilityIndex(file) {
  21. let raw = {};
  22. try {
  23. raw = JSON.parse(fs.readFileSync(file, 'utf8'));
  24. } catch {
  25. raw = {};
  26. }
  27. const index = new Map();
  28. for (const [domain, entry] of Object.entries(raw.merchants || {})) {
  29. const score = Number(entry?.score);
  30. if (!Number.isFinite(score) || score < 0 || score > 100) continue;
  31. index.set(String(domain).toLowerCase().replace(/^www\./, ''), {
  32. score,
  33. note: String(entry?.note || ''),
  34. });
  35. }
  36. return index;
  37. }
  39. /** Look up a shop domain (URL or bare domain accepted). Returns
  40. * {score, band, note}; band ∈ good|medium|poor|unknown. */
  41. export function lookupSustainability(domain, index) {
  42. const norm = normalizeDomain(domain || '');
  43. const d = norm?.domain || (typeof domain === 'string' ? domain.trim().toLowerCase() : '');
  44. if (!d || !d.includes('.')) return { score: null, band: 'unknown', note: 'no shop domain given' };
  45. const hit = index.get(d) || index.get(d.replace(/^www\./, ''));
  46. if (!hit) return { score: null, band: 'unknown', note: 'no data in the static sustainability dataset' };
  47. const band = hit.score >= 70 ? 'good' : hit.score >= 45 ? 'medium' : 'poor';
  48. return { score: hit.score, band, note: hit.note };
  49. }
  51. /** Basic deterministic merchant risk score (0–100, higher = riskier) from
  52. * existing local signals only: customer trusted list, LEASH threat-intel
  53. * malicious-domain hit, Trusted Shops listing/rating. Advisory context for
  54. * the offer comparison — the decision engine's own rules are unaffected. */
  55. export function scoreMerchantRisk({ trusted = false, malicious = false, trustedShopsResult = null } = {}) {
  56. if (malicious) {
  57. return { score: 90, band: 'high', reasons: ['merchant matches known-malicious infrastructure in the LEASH threat-intel dataset'] };
  58. }
  59. const reasons = [];
  60. let score = 55; // unverified baseline
  61. if (trusted) { score -= 35; reasons.push('on your trusted merchants list'); }
  62. const ts = trustedShopsResult;
  63. if (ts && ts.listed) {
  64. const mark = ts.primary?.rating?.overallMark;
  65. if (mark != null) { score -= 20; reasons.push(`Trusted Shops rating ${mark}/5`); }
  66. else { score -= 10; reasons.push('Trusted Shops profile found (no rating)'); }
  67. } else if (ts && ts.listed === false) {
  68. reasons.push('no Trusted Shops profile');
  69. } else {
  70. reasons.push('Trusted Shops check unavailable');
  71. }
  72. if (!reasons.length) reasons.push('no corroborating signals');
  73. score = Math.max(0, Math.min(100, Math.round(score)));
  74. const band = score <= 30 ? 'low' : score <= 60 ? 'medium' : 'high';
  75. return { score, band, reasons };
  76. }
  78. const RISK_BAND_ORDER = { low: 0, medium: 1, high: 2, unknown: 3 };
  80. /** Rank offers for the comparison view. Risk band first (low < medium < high);
  81. * when prefer is on, sustainability breaks ties WITHIN the same risk band
  82. * only — it never promotes an offer past a strictly safer band. Within a
  83. * band, shops with sustainability data sort before unknown ones, then lower
  84. * absolute risk wins. `limit` (when a positive number) caps the result to the
  85. * top N — the comparison endpoint compares only the top 3 by this score.
  86. * Pure + deterministic. */
  87. export function rankOffers(offers, { prefer = false, limit = null } = {}) {
  88. const ranked = offers.slice().sort((a, b) => {
  89. const r = (RISK_BAND_ORDER[a.risk?.band] ?? 3) - (RISK_BAND_ORDER[b.risk?.band] ?? 3);
  90. if (r !== 0) return r;
  91. if (prefer) {
  92. const sa = a.sustainability?.score ?? null;
  93. const sb = b.sustainability?.score ?? null;
  94. if (sa != null && sb != null && sa !== sb) return sb - sa; // more sustainable first
  95. if (sa != null && sb == null) return -1; // known data before unknown
  96. if (sa == null && sb != null) return 1;
  97. }
  98. return (a.risk?.score ?? 0) - (b.risk?.score ?? 0); // lower absolute risk first
  99. });
  100. return Number.isFinite(limit) && limit > 0 ? ranked.slice(0, limit) : ranked;
  101. }