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lib/worker.js

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  1. // LEASH wallet-control — worker.
  2. // Long-polls the platform for authorization requests, evaluates each against the
  3. // wallet policy with the deterministic engine, and submits decisions well inside
  4. // the 8-second deadline. Step-ups are surfaced to the customer UI and resolved via
  5. // /resolve with the real customer's answer (never invented by the worker).
  6. import { evaluate } from './engine.js';
  7. import { normalizeDomain } from './trustedshops.js';
  9. export class Worker {
  10. constructor({ client, store, profiles, trust, trustedShops = null, jev = null, bridgeSync = null, log = console }) {
  11. this.jev = jev;
  12. this.client = client; // HttpApiClient | LocalApi
  13. this.store = store;
  14. this.profiles = profiles;
  15. this.trust = trust;
  16. this.trustedShops = trustedShops; // TrustedShopsChecker (optional, advisory evidence)
  17. this.bridgeSync = bridgeSync; // { url, token, user, fetchImpl? } — shopper bridge whitelist mirror (optional)
  18. this.log = log;
  19. this.activeRuns = new Map(); // run_id -> {stop}
  20. this.feed = []; // UI event feed (bounded)
  21. }
  23. pushFeed(entry) {
  24. this.feed.unshift({ at: new Date().toISOString(), ...entry });
  25. if (this.feed.length > 500) this.feed.length = 500;
  26. }
  28. async startRun(runId) {
  29. if (this.activeRuns.has(runId)) return;
  30. let stopped = false;
  31. this.activeRuns.set(runId, { stop: () => { stopped = true; } });
  32. this.pushFeed({ kind: 'run', run_id: runId, text: `Worker attached to run ${runId}` });
  33. // fire-and-forget loop; the server keeps serving while it runs
  34. this.#loop(runId, () => stopped).catch(err => {
  35. this.pushFeed({ kind: 'error', run_id: runId, text: `worker crashed: ${err.message}` });
  36. this.log.error?.('[worker]', err);
  37. });
  38. }
  40. stopRun(runId) {
  41. this.activeRuns.get(runId)?.stop();
  42. }
  44. async #loop(runId, isStopped) {
  45. let emptyStreak = 0;
  46. while (!isStopped()) {
  47. const run = this.store.getRun(runId);
  48. if (run && run.status === 'completed') break;
  49. let res;
  50. try {
  51. res = await this.client.nextRequest(runId, 25000);
  52. } catch (err) {
  53. this.pushFeed({ kind: 'error', run_id: runId, text: `poll failed: ${err.message}` });
  54. await sleep(2000);
  55. continue;
  56. }
  57. if (!res) {
  58. emptyStreak++;
  59. const runNow = this.store.getRun(runId);
  60. if (runNow && emptyStreak >= 2 && runNow.decisions.size >= (runNow.totalEvents || Infinity)) {
  61. runNow.status = runNow.stepUps.size ? 'awaiting_customers' : 'completed';
  62. this.pushFeed({ kind: 'run', run_id: runId, text: runNow.stepUps.size ? 'All purchases evaluated — waiting for customer answers.' : 'Run complete — all purchases decided.' });
  63. break;
  64. }
  65. continue;
  66. }
  67. emptyStreak = 0;
  68. await this.#handleRequest(runId, res.envelope);
  69. }
  70. this.activeRuns.delete(runId);
  71. }
  73. async #handleRequest(runId, envelope) {
  74. const event = envelope.data;
  75. const a = event.authorization;
  76. const run = this.store.getRun(runId);
  77. const liveId = a.authorization_id;
  79. // Repeated delivery of the same live purchase: reconcile with the saved result.
  80. const prior = this.store.getDecision(runId, liveId);
  81. if (prior && prior.submitted) {
  82. this.pushFeed({ kind: 'replay', run_id: runId, authorization_id: liveId, text: `repeated delivery of ${liveId} — saved decision re-confirmed (no double count)` });
  83. try { await this.client.submitDecision(liveId, this.#decisionBody(prior)); } catch { /* already accepted */ }
  84. return;
  85. }
  87. // Trusted Shops verification (advisory evidence; capped at 2.5 s so the 8 s
  88. // decision deadline is never at risk — the engine itself stays sub-ms). A cold
  89. // check spans the member registry + 12 country-site searches (~1–2 s); a check
  90. // that misses the budget keeps running and lands in the checker cache, so
  91. // later events for the same merchant get the evidence instantly.
  92. const merchantSite = a.merchant?.merchant_url || a.merchant?.website_url || a.merchant?.merchant_domain || a.merchant?.url || null;
  93. const merchantDomain = normalizeDomain(merchantSite)?.domain?.replace(/^www\./, '') || null;
  94. const remaining = event.deadline_at ? Date.parse(event.deadline_at) - Date.now() : 8000;
  95. const enrichmentBudget = Math.max(0, Math.min(2500, remaining - 2000));
  96. const extras = {};
  97. await Promise.all([
  98. this.trustedShops && merchantSite && enrichmentBudget >= 50
  99. ? withinBudget(() => this.trustedShops.checkOne(merchantSite), enrichmentBudget).then(value => { extras.trustedShops = value; })
  100. : Promise.resolve(),
  101. this.jev ? this.jev.evaluate(event, enrichmentBudget).then(value => { extras.jev = value; }).catch(() => { extras.jev = { status: 'unavailable' }; }) : Promise.resolve(),
  102. ]);
  104. // Evaluate (deadline-aware: engine is sub-ms; guard anyway).
  105. const evaluation = evaluate(event, this.store.runState(run), this.profiles, this.trust, extras);
  106. const record = {
  107. authorizationId: liveId,
  108. sourceAuthorizationId: a.source_authorization_id || null,
  109. decision: evaluation.decision,
  110. reason_codes: evaluation.reason_codes,
  111. customer_message: evaluation.customer_message,
  112. confidence: evaluation.confidence,
  113. evidence: evaluation.evidence,
  114. uncertainties: evaluation.uncertainties,
  115. flags: evaluation.flags,
  116. signature: evaluation.signature,
  117. evaluation_ms: evaluation.evaluation_ms,
  118. merchant: a.merchant?.merchant_name,
  119. merchantId: a.merchant?.merchant_id,
  120. merchantUrl: merchantSite,
  121. merchantDomain,
  122. amount: a.billing_amount_chf,
  123. currency: a.currency,
  124. simTs: new Date(a.timestamp).getTime(),
  125. replay_order: a.replay_order,
  126. purchase_description: a.purchase_description,
  127. items: (a.items || []).map(i => ({ name: i.item_name, qty: i.quantity, price: i.unit_price, currency: i.currency, category: i.item_category, details: i.item_details })),
  128. finalDecision: evaluation.decision === 'approve' || evaluation.decision === 'decline' ? evaluation.decision : null,
  129. submitted: false,
  130. };
  132. // Retry transport failures, then finalize every accepted response identically.
  133. let accepted = false;
  134. let submitError;
  135. for (let attempt = 0; attempt < 2; attempt++) {
  136. try {
  137. const remaining = event.deadline_at ? Date.parse(event.deadline_at) - Date.now() : 8000;
  138. if (!Number.isFinite(remaining) || remaining <= 50) throw new Error('Decision deadline exhausted');
  139. await this.client.submitDecision(liveId, this.#decisionBody(record), Math.max(1, remaining - 50));
  140. accepted = true;
  141. break;
  142. } catch (err) { submitError = err; }
  143. }
  144. if (!accepted) {
  145. this.store.recordDecision(runId, liveId, { ...record, submitted: false, submitError: submitError?.message });
  146. this.pushFeed({ kind: 'error', run_id: runId, authorization_id: liveId, text: `decision submit failed: ${submitError?.message}` });
  147. return;
  148. }
  149. this.store.acceptDecision(runId, liveId, record, event, evaluation, Date.now() + 120_000);
  150. this.pushFeed({
  151. kind: 'decision', run_id: runId, authorization_id: liveId,
  152. decision: evaluation.decision, merchant: record.merchant, amount: record.amount,
  153. reason_codes: evaluation.reason_codes, message: evaluation.customer_message,
  154. confidence: evaluation.confidence, evidence: evaluation.evidence,
  155. uncertainties: evaluation.uncertainties, manipulation: evaluation.flags.manipulation,
  156. items: record.items, replay_order: a.replay_order, evaluation_ms: evaluation.evaluation_ms,
  157. });
  158. }
  160. #decisionBody(record) {
  161. return {
  162. authorization_id: record.authorizationId,
  163. decision: record.decision,
  164. reason_codes: record.reason_codes,
  165. customer_message: record.customer_message,
  166. evidence: record.evidence?.map(e => ({ label: e.label, value: e.value })) || [],
  167. engine_version: 'leash-engine 1.0.0',
  168. };
  169. }
  171. /** Best-effort mirror of a customer-trusted merchant into the shopper
  172. * bridge's per-account website whitelist (viseca-shopper-ui), so the
  173. * agent's signed policies for that domain pass the bridge's sign-time
  174. * enforcement. Config arrives via server.js from SHOPPER_BRIDGE_URL /
  175. * SHOPPER_BRIDGE_SYNC_TOKEN / SHOPPER_BRIDGE_USER. Never throws — the
  176. * customer's approval must never depend on this succeeding. */
  177. async syncBridgeWhitelist(domain) {
  178. const cfg = this.bridgeSync || {};
  179. if (!cfg.url || !cfg.token || !cfg.user) return { skipped: 'not configured' };
  180. try {
  181. const doFetch = cfg.fetchImpl || fetch;
  182. const res = await doFetch(`${String(cfg.url).replace(/\/+$/, '')}/api/internal/shopping/whitelist`, {
  183. method: 'POST',
  184. headers: { 'content-type': 'application/json', authorization: `Bearer ${cfg.token}` },
  185. body: JSON.stringify({ email: cfg.user, domain }),
  186. signal: AbortSignal.timeout(4000),
  187. });
  188. const detail = await res.json().catch(() => null);
  189. return {
  190. ok: Boolean(res.ok),
  191. status: res.status,
  192. added: detail?.added ?? null,
  193. already: Boolean(detail?.already),
  194. error: res.ok ? null : (detail?.error || `HTTP ${res.status}`),
  195. };
  196. } catch (err) {
  197. return { ok: false, error: err?.message || String(err) };
  198. }
  199. }
  201. /** Customer answered a step-up from the UI. When `opts.whitelist` is set the
  202. * customer explicitly trusted the merchant: the domain joins the persisted
  203. * trusted list, so future purchases there skip the yellow-list review. */
  204. async resolveStepUp(runId, authorizationId, decision, customerMessage, opts = {}) {
  205. if (!['approve', 'decline'].includes(decision)) throw new Error('decision must be approve|decline');
  206. await this.client.resolve(authorizationId, {
  207. decision,
  208. customer_message: customerMessage || `The customer reviewed and chose to ${decision} this purchase.`,
  209. });
  210. const normalized = decision === 'approve' ? 'approved' : 'declined';
  211. const { decision: rec } = this.store.recordStepUpResolution(runId, authorizationId, normalized, customerMessage) || {};
  212. let whitelistAdded = null;
  213. let bridgeSync = null;
  214. if (opts.whitelist && decision === 'approve' && rec?.merchantDomain) {
  215. whitelistAdded = this.store.addTrustedDomain(rec.merchantDomain, 'customer approved during purchase review');
  216. if (whitelistAdded) {
  217. bridgeSync = await this.syncBridgeWhitelist(whitelistAdded);
  218. const outcome = bridgeSync.skipped ? 'shopper-bridge sync skipped (not configured)'
  219. : bridgeSync.ok ? (bridgeSync.already ? 'also on the shopper-bridge whitelist already'
  220. : 'also whitelisted in the shopper bridge')
  221. : `shopper-bridge sync failed: ${bridgeSync.error}`;
  222. this.pushFeed({ kind: 'trust', run_id: runId, text: `🤝 ${whitelistAdded} added to your trusted merchants — future purchases there skip the yellow-list review.`, bridge_sync: outcome });
  223. }
  224. }
  225. this.pushFeed({
  226. kind: 'resolution', run_id: runId, authorization_id: authorizationId,
  227. decision: normalized, text: `Customer ${normalized} the paused purchase${rec?.merchant ? ` at ${rec.merchant}` : ''}.`,
  228. });
  229. return { ok: true, whitelist_added: whitelistAdded, bridge_sync: bridgeSync };
  230. }
  231. }
  233. function sleep(ms) { return new Promise(r => setTimeout(r, ms)); }
  235. async function withinBudget(fn, ms) {
  236. let timer;
  237. try { return await Promise.race([Promise.resolve().then(fn), new Promise(resolve => { timer = setTimeout(() => resolve(null), ms); })]); }
  238. catch { return null; }
  239. finally { clearTimeout(timer); }
  240. }