feat(subscription): rename permit→subscription + monthly pricing

The "permit/lejet" feature is really a subscription. Full rename of the mutable master data, plus a recurring monthly price. - DB (migration 0004, data-preserving ALTER RENAME): permits→subscriptions, permit_credentials/_plates→subscription_*, sessions.permit_id→subscription_id. - Pricing: per-subscription priceMinor + period(monthly) + currency, with a site default (site_config.subscription_monthly_price_minor) pre-filling the form. - Server: subscription-flow.ts (SubscriptionFlow), routes/subscriptions.ts (/api/subscriptions). Web: SubscriptionManager, route, i18n (sq Abonimet/en). - The signed ledger `permitId` payload is intentionally kept — immutable hash-chained history; renaming it would break verification of past events. Deferred (wiki notes): fee collection into the ledger/shift (a shift-attributed payment), LPR/ANPR plate source, time-of-day access windows (overnight subscriber). Also carries the device-footer UI surface (api DeviceStatus, router mount, i18n devices) due to shared-file overlap with the preceding footer commit. Verified end-to-end on a fresh DB and migration on a live-DB copy (sessions preserved). Live DB migrated. Full monorepo builds clean. Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V
2026-06-18 13:15:04 +02:00
parent ca8c7f2fa2
commit 5697137c52
32 changed files with 1008 additions and 675 deletions
@@ -0,0 +1,247 @@
+import {
+  eq,
+  ledgerEvents,
+  sessions,
+  subscriptionCredentials,
+  subscriptionPlates,
+  subscriptions,
+  type Db,
+  type DeviceRow,
+} from "@parking/db";
+import { registry, type AccessControlDevice } from "@parking/devices";
+import type { FastifyBaseLogger } from "fastify";
+import type { DeviceReadEvent, ReadOutcome } from "./device-events.js";
+import type { EventLog } from "./event-log.js";
+import { type FlowDirection, type ResolvedRelay } from "./device-resolve.js";
+import { snapshotAsync } from "./snapshot.js";
+
+// SUBSCRIPTION flow: a subscriber identified by card/QR/plate enters/exits without
+// paying per stay (they're on a recurring plan). Reached from the read dispatcher
+// when a read matches a subscription (not an open ticket). See
+// wiki/entities/subscription.md.
+//
+// Two optional, independent bindings:
+//   - car-count: `maxConcurrent` (default 1, null = unbound) — how many of the
+//     subscription's cars may be inside at once; enforced over the session projection.
+//   - plate: optional `plates[]` — when set, a matching plate is an accepted identity
+//     too (card/QR OR plate). When unset, any car may use the subscription's card/QR.
+//
+// Direction is inferred from session state for THAT car (the read credential value
+// is the per-car session key): no open session → ENTRY; open session → EXIT. So a
+// fleet subscription can have several cars in at once, each its own session, and
+// anti-passback falls out (a second "entry" on a car already in becomes its exit).
+//
+// NB: the SIGNED ledger payload still carries `permitId` (immutable history — see the
+// schema note). The mutable master data / code is "subscription"; the on-chain field
+// name is intentionally left as-is so historical events keep verifying.
+
+export interface SubscriptionMatch {
+  readonly subscriptionId: string;
+  /** The specific credential/plate value read — the per-car session key. */
+  readonly carKey: string;
+  readonly via: "card" | "qr" | "plate";
+}
+
+export class SubscriptionFlow {
+  readonly #db: Db;
+  readonly #log: EventLog;
+  readonly #logger: FastifyBaseLogger;
+  readonly #inFlight = new Set<string>();
+
+  constructor(db: Db, log: EventLog, logger: FastifyBaseLogger) {
+    this.#db = db;
+    this.#log = log;
+    this.#logger = logger;
+  }
+
+  /** Resolve a read to a subscription (by card/QR credential, or a bound plate), or null. */
+  match(e: DeviceReadEvent): SubscriptionMatch | null {
+    // Card / QR / generic credential value.
+    const cred = this.#db
+      .select()
+      .from(subscriptionCredentials)
+      .where(eq(subscriptionCredentials.value, e.value))
+      .get();
+    if (cred) {
+      return { subscriptionId: cred.subscriptionId, carKey: e.value, via: cred.kind === "qr" ? "qr" : "card" };
+    }
+    // Plate binding: a read plate that matches a subscription's bound plate is an identity.
+    if (e.kind === "plate") {
+      const plate = this.#db.select().from(subscriptionPlates).where(eq(subscriptionPlates.plate, e.value)).get();
+      if (plate) return { subscriptionId: plate.subscriptionId, carKey: e.value, via: "plate" };
+    }
+    return null;
+  }
+
+  /** Run the subscription entry/exit for a matched read at a barrier. `resolved` is the
+   *  reader's bound relay; its direction constrains, "both" defers to session state. */
+  async run(resolved: ResolvedRelay, e: DeviceReadEvent, m: SubscriptionMatch): Promise<ReadOutcome> {
+    const key = `${m.subscriptionId}:${m.carKey}`;
+    if (this.#inFlight.has(key)) return { accepted: false, reason: "duplicate read in flight" };
+    this.#inFlight.add(key);
+    try {
+      return await this.#run(resolved, e, m);
+    } catch (err) {
+      this.#logger.error(`subscription-flow failed: ${(err as Error).message}`);
+      return { accepted: false, reason: (err as Error).message };
+    } finally {
+      this.#inFlight.delete(key);
+    }
+  }
+
+  async #run(resolved: ResolvedRelay, e: DeviceReadEvent, m: SubscriptionMatch): Promise<ReadOutcome> {
+    const sub = this.#db.select().from(subscriptions).where(eq(subscriptions.id, m.subscriptionId)).get();
+    if (!sub) return { accepted: false, reason: "subscription not found" };
+
+    // Validity: active + within the coverage window.
+    const now = new Date().toISOString();
+    const invalid =
+      sub.status !== "active" ||
+      (sub.validFrom != null && now < sub.validFrom) ||
+      (sub.validTo != null && now > sub.validTo);
+    if (invalid) {
+      const reason = `subscription ${sub.status}/out-of-window`;
+      await this.#reject(m, reason);
+      return { accepted: false, reason };
+    }
+
+    // Direction: the car's open-session state is the natural verb (in→exit, out→entry).
+    // The barrier the car is at (resolved.direction) must AGREE — a car at an exit
+    // barrier that isn't inside (or at an entry barrier while already in) is a
+    // wrong-barrier / anti-passback signal, refused + logged. A "both" barrier follows
+    // the session state.
+    const carOpen = this.#carHasOpenSession(m.carKey);
+    const inferred: FlowDirection = carOpen ? "exit" : "entry";
+    if (resolved.direction !== "both" && resolved.direction !== inferred) {
+      const reason = `subscription wrong barrier — ${resolved.direction} barrier but car would ${inferred}`;
+      await this.#reject(m, reason);
+      return { accepted: false, direction: resolved.direction === "exit" ? "exit" : "entry", reason };
+    }
+
+    if (carOpen) {
+      // EXIT: this car is already inside → the read is its exit.
+      await this.#log.append({
+        type: "vehicle_exit",
+        direction: "exit",
+        source: m.via === "plate" ? "lpr" : m.via === "qr" ? "qr" : "wiegand",
+        identity: m.carKey,
+        // `permitId` is the on-chain field name (immutable) — carries the subscription id.
+        payload: { sessionRef: m.carKey, permitId: m.subscriptionId },
+      });
+      await this.#open(resolved, "exit", m.carKey, "subscription exit");
+      this.#closeCache(m.carKey);
+      return { accepted: true, direction: "exit" };
+    }
+
+    // ENTRY: enforce the car-count binding (maxConcurrent), then sign + open.
+    if (sub.maxConcurrent != null) {
+      const open = this.#subscriptionOpenCount(m.subscriptionId);
+      if (open >= sub.maxConcurrent) {
+        const reason = `subscription at capacity (${open}/${sub.maxConcurrent} cars in)`;
+        await this.#reject(m, reason);
+        return { accepted: false, direction: "entry", reason };
+      }
+    }
+
+    await this.#log.append({
+      type: "vehicle_entry",
+      direction: "entry",
+      source: m.via === "plate" ? "lpr" : m.via === "qr" ? "qr" : "wiegand",
+      identity: m.carKey,
+      // No ticket, no fee — the subscription IS the authorization. Recorded for audit.
+      // `permitId`/`permit` are the on-chain field names (immutable).
+      payload: { sessionRef: m.carKey, permitId: m.subscriptionId, permit: true },
+      occurredAt: now,
+    });
+    await this.#open(resolved, "entry", m.carKey, "subscription entry");
+    try {
+      this.#db
+        .insert(sessions)
+        .values({
+          id: m.carKey,
+          identity: m.carKey,
+          source: m.via === "plate" ? "lpr" : "wiegand",
+          subscriptionId: m.subscriptionId,
+          enteredAt: now,
+          state: "open",
+        })
+        .run();
+    } catch (err) {
+      this.#logger.error(`session-cache insert failed for ${m.carKey}: ${(err as Error).message}`);
+    }
+    return { accepted: true, direction: "entry" };
+  }
+
+  /** Does this specific car (credential value) have an open session right now? */
+  #carHasOpenSession(carKey: string): boolean {
+    const rows = this.#db
+      .select()
+      .from(ledgerEvents)
+      .where(eq(ledgerEvents.identity, carKey))
+      .orderBy(ledgerEvents.index)
+      .all();
+    const entries = rows.filter((r) => r.type === "vehicle_entry").length;
+    const exits = rows.filter((r) => r.type === "vehicle_exit").length;
+    return entries > exits;
+  }
+
+  /** How many of this subscription's cars are inside right now (fold over the ledger).
+   *  The on-chain field is `permitId`, so we match against that. */
+  #subscriptionOpenCount(subscriptionId: string): number {
+    const rows = this.#db
+      .select()
+      .from(ledgerEvents)
+      .where(eq(ledgerEvents.type, "vehicle_entry"))
+      .all()
+      .filter((r) => (r.payload as { permitId?: string } | null)?.permitId === subscriptionId);
+    let open = 0;
+    for (const entry of rows) {
+      if (!this.#carHasOpenSession(entry.identity ?? "")) continue;
+      open += 1;
+    }
+    return open;
+  }
+
+  async #reject(m: SubscriptionMatch, reason: string): Promise<void> {
+    await this.#log.append({
+      type: "anomaly",
+      identity: m.carKey,
+      // `permitId`/`permitRefused` are the on-chain field names (immutable).
+      payload: { reason: `subscription refused — ${reason}`, permitId: m.subscriptionId, permitRefused: true },
+    });
+    this.#logger.warn(`subscription refused (${m.carKey}): ${reason}`);
+  }
+
+  async #open(resolved: ResolvedRelay, dir: FlowDirection, carKey: string, what: string): Promise<void> {
+    const access = this.#buildAccess(resolved.controller);
+    if (access) await access.pulseOpen(resolved.relay);
+    else this.#logger.warn(`${what} signed for ${carKey} but the ${dir} relay won't build`);
+
+    // SNAPSHOT — fire the directional camera(s), never awaited (evidence, not a gate).
+    void snapshotAsync({
+      db: this.#db,
+      direction: dir,
+      identity: carKey,
+      logger: this.#logger,
+    }).catch((err) => this.#logger.error(`subscription snapshot error: ${(err as Error).message}`));
+  }
+
+  #closeCache(carKey: string): void {
+    try {
+      this.#db.update(sessions).set({ exitedAt: new Date().toISOString(), state: "closed" }).where(eq(sessions.id, carKey)).run();
+    } catch (err) {
+      this.#logger.error(`session-cache close failed for ${carKey}: ${(err as Error).message}`);
+    }
+  }
+
+  /** Build a live access adapter from a resolved controller row, or null. */
+  #buildAccess(row: DeviceRow): AccessControlDevice | null {
+    const driver = registry.get(row.driverId);
+    if (!driver) return null;
+    try {
+      return driver.create(row.config as never) as AccessControlDevice;
+    } catch {
+      return null;
+    }
+  }
+}