CCTV Street View fallback: catalog cameras only, at their catalog position, inside the Google budget

server/providers/cctv.js

@@ -19,6 +19,8 @@ import { admitSameSiteKeyless } from './common/same-site.js';
 import { PROXY_SIGNALS } from '../../src/localRequestGate.mjs';
 import { createHlsPuller } from './cctv/stream.js';
 import { googleServerApiKey } from './places/google-key.js';
+import { googleRateLimiter } from './places/google.js';
+import { clientKey } from './common/rate-limit.js';
 export { CCTV_FRAME_FETCH_TIMEOUT_MS, fetchCctvImageFromUpstream };
 /**
  * Vite plugin: CCTV camera proxy with source registry, frame/media serving,
@@ -509,13 +511,6 @@ export function cctvProxy({ sourceRoot = process.cwd() } = {}) {
         const source = sourceById.get(cameraId);
         const label = url.searchParams.get('label') || source?.name || cameraId;
         const city = url.searchParams.get('city') || source?.city || '';
-        const lat = Number(url.searchParams.get('lat') || source?.lat);
-        const lon = Number(url.searchParams.get('lon') || source?.lon);
-        const heading = Number(
-          url.searchParams.get('heading') || source?.headingDeg,
-        );
-        const fov = Number(url.searchParams.get('fov') || source?.fovDeg);
-        const pitch = Number(url.searchParams.get('pitch') || source?.pitchDeg);
 
         // Only use server-registered upstream URLs — never accept client-supplied URLs
         // (prevents SSRF via ?upstream= query parameter)
@@ -549,18 +544,24 @@ export function cctvProxy({ sourceRoot = process.cwd() } = {}) {
         // request (whose client this server cannot see) gets the placeholder,
         // as if no key were configured. Any forwarding header counts, even an
         // empty one.
+        // It is also only for catalog cameras, framed from the catalog (never
+        // a spot the query names), within the per-IP Google budget.
         const forwarded = PROXY_SIGNALS.some(
           (name) => req.headers?.[name] !== undefined,
         );
-        const sv = forwarded
-          ? null
-          : await streetViewFallback({
-              lat,
-              lon,
-              heading,
-              fov,
-              pitch,
-            });
+        const googleBudget = googleServerApiKey() ? googleRateLimiter() : null;
+        const sv =
+          forwarded ||
+          !source ||
+          (googleBudget && !googleBudget(clientKey(req)))
+            ? null
+            : await streetViewFallback({
+                lat: Number(source.lat),
+                lon: Number(source.lon),
+                heading: Number(source.headingDeg),
+                fov: Number(source.fovDeg),
+                pitch: Number(source.pitchDeg ?? -10),
+              });
         if (sv?.ok) {
           setHealth(cameraId, {
             status: 'degraded',

server/providers/places/google.js

@@ -27,8 +27,8 @@ let _googleRateLimiter;
  */
 export const GOOGLE_DEFAULT_PER_MIN = 120;
 
-/** Google cost endpoints (nearby-places, text-search, geocoding). Null only when set to 0. */
-function googleRateLimiter() {
+/** Google cost endpoints (nearby-places, text-search, geocoding, the CCTV Street View fallback). Null only when set to 0. */
+export function googleRateLimiter() {
   if (_googleRateLimiter === undefined)
     _googleRateLimiter = makeCostRateLimiter(
       process.env.GEV_RATELIMIT_GOOGLE_PER_MIN,

src/data/cctvMediaFeedType.test.mjs

@@ -528,3 +528,30 @@ test('a forwarded same-origin request reaches every CCTV route but not the Stree
   assert.equal(direct.body, 'street-view');
   assert.equal(streetViewCalls(), 1);
 });
+
+test('the Street View fallback frames catalog cameras only, from the catalog position', async (t) => {
+  const app = mount(t, ({ url }) =>
+    url.startsWith('https://maps.googleapis.com/')
+      ? trackedUpstream({
+          headers: { 'content-type': 'image/jpeg' },
+          body: 'street-view',
+        }).response
+      : upstreamResponse({ status: 503 }),
+  );
+  process.env.GOOGLE_MAPS_SERVER_API_KEY = 'fixture-key';
+  const streetView = () =>
+    app.requests.filter(({ url }) =>
+      url.startsWith('https://maps.googleapis.com/'),
+    );
+
+  const unknown = await app.call('/frame/not-a-camera?lat=48.85&lon=2.29');
+  assert.equal(unknown.headers['X-CCTV-Source'], 'synthetic');
+  assert.deepEqual(streetView(), [], 'no Google call for an unknown id');
+
+  const steered = await app.call(
+    `/frame/${STILL.id}?lat=48.85&lon=2.29&heading=90`,
+  );
+  assert.equal(steered.headers['X-CCTV-Source'], 'streetview');
+  const location = new URL(streetView()[0].url).searchParams.get('location');
+  assert.equal(location, `${STILL.lat},${STILL.lon}`);
+});