feat(camera): Hikvision Alarm Server event-push ingress (discovery-first)

Newer Hik firmware can PUSH events to us: Event -> Smart/VCA with
"Detection Target: Human/Vehicle" + Notify Surveillance Center + Alarm
Settings -> Alarm Server makes the camera HTTP-POST an
EventNotificationAlert on each detection.

- New POST /api/devices/hikvision/:deviceId/event (routes/hikvision-alarm.ts):
  same machine-push pattern as the Dingtian Input Link — source-IP guarded
  + optional HTTP Digest, not behind the SPA cookie/CSRF.
- Discovery-first / permissive: a wildcard content-type parser accepts ANY
  body as raw bytes (event XML, multipart+JPEG, or JSON — Hik varies by
  firmware), records it verbatim as a kind:"alarm" device_event, and
  best-effort extracts eventType/target/plate/dateTime/channelID for the
  summary + a loud log line. The point is to SEE exactly what a camera
  sends before wiring it further.
- hikvision driver gains alarmPushEnabled + pushUser/pushPassword config and
  pushesToBackend:true (setup offers the backend push IP).
- NOT yet a barrier trigger / DeviceReadEvent — records only. A plate read
  is advisory, never the sole reason a barrier opens; the read-bus/ANPR
  wiring is a deliberate next step once the real payload is known.

Tests: hikvision-alarm.test.ts (6: vehicle XML summary, ANPR plate, raw
JSON, wrong-IP 404, disabled 404, unknown-device 404). server 109/109;
build+lint 14/14. Wiki: lpr-camera.md + log.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

apps/server/src/routes/hikvision-alarm.test.ts

@@ -0,0 +1,150 @@
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { createTestDb } from "@parking/db/testing";
+import { and, eq, devices, deviceEvents as deviceEventsTable, type Db } from "@parking/db";
+import type { FastifyInstance } from "fastify";
+import { buildServer } from "../server.js";
+
+// Hikvision Alarm Server push ingress. Verifies the discovery endpoint: a vehicle-
+// detection POST from the camera's configured IP is accepted, summarized (eventType /
+// target / plate pulled out of the XML), and recorded verbatim as a kind:"alarm"
+// device_event — while a wrong source IP or a push-disabled device is refused.
+
+const CAM_IP = "10.0.10.121";
+const CAM_ID = "cam-1";
+
+let db: Db;
+let close: () => void;
+let app: FastifyInstance;
+
+beforeEach(async () => {
+  const t = createTestDb();
+  db = t.db;
+  close = t.close;
+  app = await buildServer({ db });
+  await app.ready();
+});
+afterEach(async () => {
+  await app.close();
+  close();
+});
+
+function seedHikCamera(cfg: Record<string, unknown> = {}) {
+  db.insert(devices).values({
+    id: CAM_ID,
+    category: "camera",
+    driverId: "hikvision",
+    config: { host: CAM_IP, alarmPushEnabled: true, ...cfg },
+    enabled: true,
+  }).run();
+}
+
+/** A representative Hikvision smart-event POST body (vehicle target). The real firmware
+ *  payload may differ; the endpoint stores it verbatim regardless — this asserts the
+ *  best-effort summary extraction over a plausible shape. */
+const VEHICLE_XML = `<?xml version="1.0" encoding="UTF-8"?>
+<EventNotificationAlert version="2.0" xmlns="http://www.hikvision.com/ver20/XMLSchema">
+  <ipAddress>10.0.10.121</ipAddress>
+  <channelID>1</channelID>
+  <dateTime>2026-06-22T10:15:30+02:00</dateTime>
+  <eventType>fielddetection</eventType>
+  <eventState>active</eventState>
+  <DetectionRegionList>
+    <DetectionRegionEntry><detectionTarget>vehicle</detectionTarget></DetectionRegionEntry>
+  </DetectionRegionList>
+</EventNotificationAlert>`;
+
+function alarmEvents(): { detail: Record<string, unknown> }[] {
+  return db
+    .select()
+    .from(deviceEventsTable)
+    .where(and(eq(deviceEventsTable.deviceId, CAM_ID), eq(deviceEventsTable.kind, "alarm")))
+    .all() as { detail: Record<string, unknown> }[];
+}
+
+describe("Hikvision Alarm Server push", () => {
+  it("accepts a vehicle event from the camera IP and records it with a parsed summary", async () => {
+    seedHikCamera();
+    const res = await app.inject({
+      method: "POST",
+      url: `/api/devices/hikvision/${CAM_ID}/event`,
+      headers: { "content-type": "application/xml" },
+      payload: VEHICLE_XML,
+      remoteAddress: CAM_IP,
+    });
+    expect(res.statusCode).toBe(200);
+
+    const events = alarmEvents();
+    expect(events).toHaveLength(1);
+    const d = events[0]!.detail;
+    expect(d.source).toBe("hikvision-alarm-server");
+    expect(d.eventType).toBe("fielddetection");
+    expect(d.target).toBe("vehicle");
+    expect(d.ip).toBe(CAM_IP);
+    // The raw body is kept verbatim for inspection.
+    expect(String(d.rawHead)).toContain("EventNotificationAlert");
+  });
+
+  it("pulls a plate out of an ANPR-style payload when present", async () => {
+    seedHikCamera();
+    const anpr = `<EventNotificationAlert><eventType>ANPR</eventType>
+      <ANPR><plateNumber>AA123BB</plateNumber></ANPR></EventNotificationAlert>`;
+    const res = await app.inject({
+      method: "POST",
+      url: `/api/devices/hikvision/${CAM_ID}/event`,
+      headers: { "content-type": "application/xml" },
+      payload: anpr,
+      remoteAddress: CAM_IP,
+    });
+    expect(res.statusCode).toBe(200);
+    expect(alarmEvents()[0]!.detail.plate).toBe("AA123BB");
+  });
+
+  it("accepts an unknown/JSON content-type as raw bytes (discovery-first)", async () => {
+    seedHikCamera();
+    const res = await app.inject({
+      method: "POST",
+      url: `/api/devices/hikvision/${CAM_ID}/event`,
+      headers: { "content-type": "application/octet-stream" },
+      payload: Buffer.from('{"eventType":"vehicleDetection"}'),
+      remoteAddress: CAM_IP,
+    });
+    expect(res.statusCode).toBe(200);
+    expect(alarmEvents()[0]!.detail.eventType).toBe("vehicleDetection");
+  });
+
+  it("rejects a push from a DIFFERENT source IP (404, nothing recorded)", async () => {
+    seedHikCamera();
+    const res = await app.inject({
+      method: "POST",
+      url: `/api/devices/hikvision/${CAM_ID}/event`,
+      headers: { "content-type": "application/xml" },
+      payload: VEHICLE_XML,
+      remoteAddress: "10.0.10.200", // not the camera
+    });
+    expect(res.statusCode).toBe(404);
+    expect(alarmEvents()).toHaveLength(0);
+  });
+
+  it("rejects when alarm push is disabled on the device", async () => {
+    seedHikCamera({ alarmPushEnabled: false });
+    const res = await app.inject({
+      method: "POST",
+      url: `/api/devices/hikvision/${CAM_ID}/event`,
+      headers: { "content-type": "application/xml" },
+      payload: VEHICLE_XML,
+      remoteAddress: CAM_IP,
+    });
+    expect(res.statusCode).toBe(404);
+  });
+
+  it("rejects an unknown device id", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: `/api/devices/hikvision/nope/event`,
+      headers: { "content-type": "application/xml" },
+      payload: VEHICLE_XML,
+      remoteAddress: CAM_IP,
+    });
+    expect(res.statusCode).toBe(404);
+  });
+});

apps/server/src/routes/hikvision-alarm.ts

@@ -0,0 +1,165 @@
+import { randomUUID } from "node:crypto";
+import type { FastifyInstance, FastifyReply, FastifyRequest } from "fastify";
+import { eq, devices, deviceEvents as deviceEventsTable, type Db } from "@parking/db";
+import { deviceEvents } from "../device-events.js";
+import { verifyDigest } from "../digest-auth.js";
+
+// Hikvision "Alarm Server" event PUSH ingress. The newer-firmware cameras (Event →
+// Smart/VCA with "Detection Target: Human/Vehicle", Notify Surveillance Center, Alarm
+// Settings → Alarm Server) HTTP-POST an EventNotificationAlert to a URL we host every
+// time the chosen target is detected. This is the same machine-call pattern as the
+// Dingtian Input Link push (routes/devices.ts): source-IP guarded, NOT behind the SPA
+// cookie/CSRF.
+//
+// DISCOVERY-FIRST. Hik's push format varies by model/firmware (event XML, or multipart
+// with an attached JPEG, or — on some ANPR units — an <ANPR>/<plateNumber> block). So
+// this endpoint is deliberately PERMISSIVE: it accepts ANY content-type as raw bytes,
+// records the verbatim body as a `kind:"alarm"` device_event, and best-effort extracts a
+// summary (eventType / target / plate). The goal of this first cut is to SEE exactly what
+// a given camera sends — inspect via GET /api/events or the logs — before we wire it into
+// the read bus / a snapshot trigger. It never opens a barrier (a plate read is advisory,
+// never the sole reason; see wiki/concepts/append-only-event-chain.md).
+//
+// See wiki/entities/lpr-camera.md, wiki/concepts/device-input-flow.md.
+
+interface HikDeviceConfig {
+  host?: string;
+  alarmPushEnabled?: boolean;
+  pushUser?: string;
+  pushPassword?: string;
+}
+
+/** A best-effort summary pulled out of the raw push body (XML or JSON), for the device
+ *  event detail + the log line. Absent fields just mean "not found in this firmware's
+ *  payload" — the raw body is always stored so nothing is lost. */
+interface AlarmSummary {
+  eventType?: string;
+  target?: string;
+  plate?: string;
+  dateTime?: string;
+  channelId?: string;
+}
+
+function clientIp(req: FastifyRequest): string {
+  return req.ip.replace(/^::ffff:/, "");
+}
+
+/** First capture group of `re` in `s`, trimmed, or undefined. */
+function pick(s: string, re: RegExp): string | undefined {
+  const m = re.exec(s);
+  return m?.[1]?.trim() || undefined;
+}
+
+/**
+ * Best-effort summary extraction. Hikvision event XML uses tags like <eventType>,
+ * <dateTime>, <channelID>; smart/ANPR events add target/plate tags whose exact names
+ * vary by firmware (<detectionTarget>, <targetType>, <plateNumber>, <licensePlate>).
+ * We probe several spellings; whatever doesn't match is simply absent. JSON bodies are
+ * scanned for the same keys.
+ */
+function summarize(body: string): AlarmSummary {
+  return {
+    eventType: pick(body, /<eventType>([^<]+)<\/eventType>/i) ?? pick(body, /"eventType"\s*:\s*"([^"]+)"/i),
+    target:
+      pick(body, /<(?:detectionTarget|targetType|objectType)>([^<]+)<\//i) ??
+      pick(body, /"(?:detectionTarget|targetType|objectType)"\s*:\s*"([^"]+)"/i),
+    plate:
+      pick(body, /<(?:plateNumber|licensePlate|plateNo)>([^<]+)<\//i) ??
+      pick(body, /"(?:plateNumber|licensePlate|plateNo)"\s*:\s*"([^"]+)"/i),
+    dateTime: pick(body, /<dateTime>([^<]+)<\/dateTime>/i),
+    channelId: pick(body, /<channelID>([^<]+)<\/channelID>/i) ?? pick(body, /<channelId>([^<]+)<\/channelId>/i),
+  };
+}
+
+export async function hikvisionAlarmRoutes(app: FastifyInstance, db: Db): Promise<void> {
+  // Accept ANY content-type as a raw Buffer (the camera may POST application/xml,
+  // multipart/form-data with a JPEG, or text). Fastify's default JSON parser would 415
+  // or empty these — we want the bytes verbatim. Scoped to THIS app instance via a
+  // wildcard parser; a 10 MB cap covers an event + an attached frame.
+  app.addContentTypeParser("*", { parseAs: "buffer", bodyLimit: 10 * 1024 * 1024 }, (_req, body, done) => {
+    done(null, body);
+  });
+
+  const handle = async (req: FastifyRequest<{ Params: { deviceId: string } }>, reply: FastifyReply) => {
+    const { deviceId } = req.params;
+    const row = await db.select().from(devices).where(eq(devices.id, deviceId)).get();
+    const cfg = row?.config as HikDeviceConfig | undefined;
+    const ip = clientIp(req);
+
+    // Guard: must be a known hikvision device with alarm-push enabled, posting from its
+    // configured host IP. Source-IP is the primary guard on the LAN (like the Dingtian).
+    if (!row || row.driverId !== "hikvision" || !cfg?.alarmPushEnabled || !cfg.host || ip !== cfg.host) {
+      app.log.warn(`rejected hik alarm push: device=${deviceId} ip=${ip} (unknown/disabled/ip-mismatch)`);
+      return reply.code(404).send({ error: "not found" });
+    }
+
+    // Optional Digest auth — only when the admin configured push creds (some firmware
+    // can't authenticate the Alarm Server call; then we rely on source-IP alone).
+    if (cfg.pushUser && cfg.pushPassword) {
+      if (!verifyDigest(req, reply, { user: cfg.pushUser, password: cfg.pushPassword })) {
+        return; // 401 challenge already sent
+      }
+    }
+
+    const contentType = String(req.headers["content-type"] ?? "");
+    const raw: Buffer = Buffer.isBuffer(req.body) ? (req.body as Buffer) : Buffer.from("");
+    // Decode as text for summary + storage. Multipart bodies have a binary image part;
+    // we keep the readable head (the XML part lives at the top) and note the full size.
+    const text = raw.toString("utf8");
+    const summary = summarize(text);
+
+    // Loud log so the operator can SEE the payload during testing.
+    app.log.info(
+      `[hik-alarm:${deviceId}] ${ip} ${contentType} ${raw.length}B ` +
+        `event=${summary.eventType ?? "?"} target=${summary.target ?? "?"} plate=${summary.plate ?? "-"}`,
+    );
+
+    // Record verbatim as telemetry (unsigned, prunable). The whole point of this first
+    // cut: capture exactly what arrives so we can design the real handler. We cap the
+    // stored body so a giant multipart frame doesn't bloat the row (the head holds the
+    // XML); the summary carries the parsed fields.
+    try {
+      db.insert(deviceEventsTable)
+        .values({
+          id: randomUUID(),
+          deviceId,
+          category: "camera",
+          kind: "alarm",
+          detail: {
+            source: "hikvision-alarm-server",
+            ip,
+            contentType,
+            bytes: raw.length,
+            ...summary,
+            // Store the readable head verbatim (XML part); truncate to keep the row small.
+            rawHead: text.slice(0, 8000),
+          },
+          occurredAt: new Date().toISOString(),
+        })
+        .run();
+    } catch (err) {
+      app.log.error(`hik-alarm device-event insert failed: ${(err as Error).message}`);
+    }
+
+    // Also surface on the in-process bus as a generic input breadcrumb so any live
+    // listener (e.g. the booth feed) can show "camera saw a vehicle" during testing.
+    // NOTE: deliberately NOT emitted as a DeviceReadEvent yet — that (a plate identity
+    // driving entry/exit) is the next, separate step once we know the payload.
+    deviceEvents.emitInput({
+      driverId: "hikvision",
+      deviceId,
+      input: 0,
+      edge: "on",
+      at: new Date().toISOString(),
+      source: "push",
+    });
+
+    // 200 so the camera considers the alarm delivered and doesn't retry-storm.
+    return reply.code(200).send({ ok: true });
+  };
+
+  // Hik posts to a single configured URL; accept POST (and GET, for a quick manual probe).
+  for (const method of ["POST", "GET"] as const) {
+    app.route({ method, url: "/api/devices/hikvision/:deviceId/event", handler: handle });
+  }
+}

apps/server/src/server.ts

@@ -24,6 +24,7 @@ import { authRoutes } from "./routes/auth.js";
 import { userRoutes } from "./routes/users.js";
 import { roleRoutes } from "./routes/roles.js";
 import { deviceRoutes } from "./routes/devices.js";
+import { hikvisionAlarmRoutes } from "./routes/hikvision-alarm.js";
 import { eventRoutes } from "./routes/events.js";
 import { reportRoutes } from "./routes/reports.js";
 import { recycleBinRoutes } from "./routes/recycle-bin.js";
@@ -114,6 +115,11 @@ export async function buildServer(opts: BuildOptions = {}): Promise<FastifyInsta
   // the device's lane_devices config (written on assign).
   await deviceRoutes(app, db);
 
+  // Hikvision "Alarm Server" event push: the camera POSTs an EventNotificationAlert on
+  // each detected target (vehicle). Source-IP guarded + optional Digest; records the raw
+  // payload as a `kind:"alarm"` device_event (discovery-first). See routes/hikvision-alarm.ts.
+  await hikvisionAlarmRoutes(app, db);
+
   // Live printer-status monitor: polls printers (paper/cover/cutter/offline) and
   // pushes changes to the booth UI. setupRoutes() has already registered the
   // built-in drivers the monitor needs. See wiki/concepts/printer-status-monitoring.md.