Changelog: 1602 fragment

changelog.d/1602-cctv-streetview-fallback-catalog.md

@@ -0,0 +1,5 @@
+- The CCTV Street View fallback serves only catalog cameras, at their catalog
+  position, heading, field of view and pitch, and ignores coordinates a
+  request supplies. It spends from the per-client Google budget
+  (`GEV_RATELIMIT_GOOGLE_PER_MIN`, default 120), so the Google key can no
+  longer be used as an unmetered Street View service (asturksever, #1602).

docs/CURRENT-STATE.md

@@ -1276,7 +1276,10 @@ and follows redirects only on the camera's origin. Catalog image URLs, and
 redirects on those hosts, are pinned by parsed URL to the agency's image
 directory. Every `/api/cctv` route refuses cross-site browser requests but
 accepts forwarding headers, so cameras work behind a reverse proxy; a forwarded
-request skips the key-bearing Street View fallback and gets the placeholder.
+request skips the key-bearing Street View fallback and gets the placeholder. The
+Street View fallback serves only catalog cameras, at the catalog position,
+heading, field of view and pitch, never coordinates a request supplies, and it
+shares the per-client Google budget (`GEV_RATELIMIT_GOOGLE_PER_MIN`, default 120).
 
 The CCTV layer draws only the cameras on or near the screen. Zoomed out, it
 keeps one camera per ground cell sized to the view, preferring a healthy feed,

scripts/package-boundaries.json

@@ -377,7 +377,9 @@
       "src/data/cctvFootprint.js",
       "src/sources/cctvTypes.js",
       "src/sources/httpBody.js",
-      "src/i18n/marker.js"
+      "src/i18n/marker.js",
+      "server/providers/common/rate-limit.js",
+      "src/sources/rateLimit.js"
     ],
     "external": []
   },

server/providers/cctv.js

@@ -19,7 +19,22 @@ 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 { clientKey, makeCostRateLimiter } from './common/rate-limit.js';
 export { CCTV_FRAME_FETCH_TIMEOUT_MS, fetchCctvImageFromUpstream };
+let _streetViewRateLimiter;
+/**
+ * Per-IP budget for the Street View fallback, on the same setting as the
+ * other Google routes (GEV_RATELIMIT_GOOGLE_PER_MIN; 0 disables it).
+ */
+function streetViewRateLimiter() {
+  if (_streetViewRateLimiter === undefined)
+    _streetViewRateLimiter = makeCostRateLimiter(
+      process.env.GEV_RATELIMIT_GOOGLE_PER_MIN,
+      120,
+    );
+  return _streetViewRateLimiter;
+}
+
 /**
  * Vite plugin: CCTV camera proxy with source registry, frame/media serving,
  * fallback chain (upstream -> Street View -> synthetic SVG), and health tracking.
@@ -509,13 +524,6 @@ 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 +557,26 @@ 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
+        const googleBudget = googleServerApiKey()
-          ? null
+          ? streetViewRateLimiter()
-          : await streetViewFallback({
+          : null;
-              lat,
+        const sv =
-              lon,
+          forwarded ||
-              heading,
+          !source ||
-              fov,
+          (googleBudget && !googleBudget(clientKey(req)))
-              pitch,
+            ? 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',

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}`);
+});