cookiebanner: detect service workers and Cache Storage buckets

A registered service worker is a URL-shaped artifact (origin+path of
the worker script), so it goes in tracker_resources as a new
SERVICE_WORKER resource type. A Cache Storage bucket is an opaque
named string with no URL, so it goes in detected_trackers as a new
CACHE_STORAGE tracker type.

Frontend:
  - StorageDetector wraps caches.open() and enumerates caches.keys()
    on start to surface pre-existing buckets that pre-date the SDK
    load (service workers commonly populate caches eagerly on
    install).
  - ThirdPartyDetector wraps navigator.serviceWorker.register() and
    enumerates getRegistrations() on start.

Both wrappers degrade silently on insecure contexts where these APIs
are unavailable.

Signed-off-by: Émile Ré <emile@getprobo.com>

apps/console/src/pages/organizations/cookie-banners/configuration/resources/CookieBannerResourcesPage.tsx

@@ -170,6 +170,7 @@ export default function CookieBannerResourcesPage({
           <Option value="BEACON">{__("Beacon")}</Option>
           <Option value="FETCH">{__("Fetch")}</Option>
           <Option value="MEDIA">{__("Media")}</Option>
+          <Option value="SERVICE_WORKER">{__("Service Worker")}</Option>
         </Select>
       </div>
 

apps/console/src/pages/organizations/cookie-banners/configuration/resources/_components/TrackerResourceRow.tsx

@@ -133,6 +133,7 @@ function resourceTypeLabel(type: string, __: (s: string) => string): string {
     case "BEACON": return __("Beacon");
     case "FETCH": return __("Fetch");
     case "MEDIA": return __("Media");
+    case "SERVICE_WORKER": return __("Service Worker");
     default: return type;
   }
 }

apps/console/src/pages/organizations/cookie-banners/configuration/trackers/_components/TrackerPatternRow.tsx

@@ -130,6 +130,7 @@ function trackerTypeLabel(type: string, __: (s: string) => string): string {
     case "LOCAL_STORAGE": return __("localStorage");
     case "SESSION_STORAGE": return __("sessionStorage");
     case "INDEXED_DB": return __("IndexedDB");
+    case "CACHE_STORAGE": return __("Cache Storage");
     default: return type;
   }
 }

packages/cookie-banner/src/detectors/storage-detector.ts

@@ -19,7 +19,11 @@ import { getInitiatorURL } from "./initiator";
 
 interface DetectedStorageEntry {
   key: string;
-  storage_type: "local_storage" | "session_storage" | "indexed_db";
+  storage_type:
+    | "local_storage"
+    | "session_storage"
+    | "indexed_db"
+    | "cache_storage";
   value_size: number | null;
   initiator_url?: string;
 }
@@ -42,6 +46,7 @@ export class StorageDetector implements Detector {
   private timer: ReturnType<typeof setTimeout> | null = null;
   private originalSetItem: typeof Storage.prototype.setItem | null = null;
   private originalIDBOpen: typeof IDBFactory.prototype.open | null = null;
+  private originalCachesOpen: typeof CacheStorage.prototype.open | null = null;
 
   constructor(baseUrl: URL, bannerId: string) {
     this.reportUrl = new URL(`${bannerId}/report`, baseUrl);
@@ -51,7 +56,9 @@ export class StorageDetector implements Detector {
   start(): void {
     this.wrapStorage();
     this.wrapIndexedDB();
+    this.wrapCacheStorage();
     this.scanExisting();
+    this.scanCacheStorage();
   }
 
   stop(): void {
@@ -72,6 +79,10 @@ export class StorageDetector implements Detector {
       IDBFactory.prototype.open = this.originalIDBOpen;
       this.originalIDBOpen = null;
     }
+    if (this.originalCachesOpen && typeof caches !== "undefined") {
+      caches.open = this.originalCachesOpen;
+      this.originalCachesOpen = null;
+    }
   }
 
   private wrapStorage(): void {
@@ -107,6 +118,20 @@ export class StorageDetector implements Detector {
     };
   }
 
+  private wrapCacheStorage(): void {
+    if (typeof caches === "undefined") return;
+
+    const originalOpen = caches.open.bind(caches);
+    this.originalCachesOpen = originalOpen;
+
+    const self = this;
+
+    caches.open = function (name: string): Promise<Cache> {
+      self.onCacheStorageOpen(name);
+      return originalOpen(name);
+    };
+  }
+
   private onStorageWrite(
     key: string,
     value: string,
@@ -143,6 +168,37 @@ export class StorageDetector implements Detector {
     this.scheduleFlush();
   }
 
+  private onCacheStorageOpen(name: string): void {
+    const reportKey = `cache_storage:${name}`;
+    if (this.reported.has(reportKey)) return;
+
+    this.reported.add(reportKey);
+    this.pending.set(reportKey, {
+      key: name,
+      storage_type: "cache_storage",
+      value_size: null,
+    });
+    this.scheduleFlush();
+  }
+
+  // scanCacheStorage enumerates pre-existing cache buckets created
+  // before the SDK loaded. Service workers commonly create their
+  // caches eagerly on `install`, so without this scan we would miss
+  // any cache bucket whose creation predates the banner script.
+  private scanCacheStorage(): void {
+    if (typeof caches === "undefined") return;
+    caches
+      .keys()
+      .then((names) => {
+        for (const name of names) {
+          this.onCacheStorageOpen(name);
+        }
+      })
+      .catch(() => {
+        // Insecure context or storage partition errors -- ignore.
+      });
+  }
+
   private scanExisting(): void {
     this.scanStorage(localStorage, "local_storage");
     this.scanStorage(sessionStorage, "session_storage");

packages/cookie-banner/src/detectors/third-party-detector.ts

@@ -24,7 +24,8 @@ type ResourceType =
   | "font"
   | "beacon"
   | "fetch"
-  | "media";
+  | "media"
+  | "service_worker";
 
 interface DetectedResourceEntry {
   url: string;
@@ -80,6 +81,7 @@ export class ThirdPartyDetector implements Detector {
   private timer: ReturnType<typeof setTimeout> | null = null;
   private observer: MutationObserver | null = null;
   private perfObserver: PerformanceObserver | null = null;
+  private originalSWRegister: typeof ServiceWorkerContainer.prototype.register | null = null;
 
   constructor(baseUrl: URL, bannerId: string) {
     this.reportUrl = new URL(`${bannerId}/report`, baseUrl);
@@ -91,6 +93,8 @@ export class ThirdPartyDetector implements Detector {
     this.scanExisting();
     this.observeMutations();
     this.observePerformance();
+    this.wrapServiceWorker();
+    this.scanServiceWorkers();
   }
 
   stop(): void {
@@ -112,6 +116,15 @@ export class ThirdPartyDetector implements Detector {
       this.perfObserver.disconnect();
       this.perfObserver = null;
     }
+
+    if (
+      this.originalSWRegister
+      && typeof navigator !== "undefined"
+      && navigator.serviceWorker
+    ) {
+      navigator.serviceWorker.register = this.originalSWRegister;
+      this.originalSWRegister = null;
+    }
   }
 
   private scanExisting(): void {
@@ -179,6 +192,50 @@ export class ThirdPartyDetector implements Detector {
     }
   }
 
+  // wrapServiceWorker intercepts navigator.serviceWorker.register so
+  // each registration -- even ones initiated by third-party SDKs --
+  // surfaces as a tracker_resource entry keyed on the worker script
+  // origin+path.
+  private wrapServiceWorker(): void {
+    if (typeof navigator === "undefined" || !navigator.serviceWorker) return;
+
+    const sw = navigator.serviceWorker;
+    const originalRegister = sw.register.bind(sw);
+    this.originalSWRegister = originalRegister;
+
+    const self = this;
+
+    sw.register = function (
+      scriptURL: string | URL,
+      options?: RegistrationOptions,
+    ): Promise<ServiceWorkerRegistration> {
+      const url = typeof scriptURL === "string" ? scriptURL : scriptURL.toString();
+      self.processResource(url, "service_worker");
+      return originalRegister(scriptURL, options);
+    };
+  }
+
+  // scanServiceWorkers enumerates registrations that pre-date the SDK
+  // (e.g. installed on a previous visit, restored from cache).
+  private scanServiceWorkers(): void {
+    if (typeof navigator === "undefined" || !navigator.serviceWorker) return;
+
+    navigator.serviceWorker
+      .getRegistrations()
+      .then((registrations) => {
+        for (const r of registrations) {
+          const url
+            = r.active?.scriptURL
+              ?? r.installing?.scriptURL
+              ?? r.waiting?.scriptURL;
+          if (url) this.processResource(url, "service_worker");
+        }
+      })
+      .catch(() => {
+        // Some browsers throw NotSupportedError in insecure contexts.
+      });
+  }
+
   private processResource(src: string, resourceType: ResourceType): void {
     if (EXTENSION_URL_RE.test(src)) return;
 

pkg/cmd/tracker-resource/create/create.go

@@ -96,6 +96,7 @@ func NewCmdCreate(f *cmdutil.Factory) *cobra.Command {
 							huh.NewOption("Beacon", "BEACON"),
 							huh.NewOption("Fetch / XHR", "FETCH"),
 							huh.NewOption("Media", "MEDIA"),
+							huh.NewOption("Service Worker", "SERVICE_WORKER"),
 						).
 						Value(&flagResourceType).Run(); err != nil {
 						return err
@@ -161,7 +162,7 @@ func NewCmdCreate(f *cmdutil.Factory) *cobra.Command {
 
 	cmd.Flags().StringVar(&flagCategoryID, "category-id", "", "Cookie category ID (required)")
 	_ = cmd.MarkFlagRequired("category-id")
-	cmd.Flags().StringVar(&flagResourceType, "resource-type", "", "Resource type: SCRIPT, IFRAME, IMAGE, STYLESHEET, FONT, BEACON, FETCH or MEDIA (required)")
+	cmd.Flags().StringVar(&flagResourceType, "resource-type", "", "Resource type: SCRIPT, IFRAME, IMAGE, STYLESHEET, FONT, BEACON, FETCH, MEDIA or SERVICE_WORKER (required)")
 	cmd.Flags().StringVar(&flagOrigin, "origin", "", "Origin URL (required)")
 	cmd.Flags().StringVar(&flagPath, "path", "", "Resource path (required)")
 	cmd.Flags().StringVar(&flagDisplayName, "display-name", "", "Display name (required)")

pkg/coredata/migrations/20260511T064746Z.sql

@@ -0,0 +1,21 @@
+-- Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+--
+-- Permission to use, copy, modify, and/or distribute this software for any
+-- purpose with or without fee is hereby granted, provided that the above
+-- copyright notice and this permission notice appear in all copies.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+-- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+-- AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+-- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+-- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+-- OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+-- PERFORMANCE OF THIS SOFTWARE.
+
+-- A registered service worker is a URL-shaped artifact, so it lives
+-- in tracker_resources alongside scripts/iframes.
+ALTER TYPE tracker_resource_type ADD VALUE IF NOT EXISTS 'SERVICE_WORKER';
+
+-- A Cache Storage bucket is just a named string identifier with no
+-- URL, so it lives in detected_trackers like the other storage types.
+ALTER TYPE tracker_type ADD VALUE IF NOT EXISTS 'CACHE_STORAGE';

pkg/coredata/tracker_resource_type.go

@@ -22,14 +22,15 @@ import (
 type TrackerResourceType string
 
 const (
-	TrackerResourceTypeScript     TrackerResourceType = "SCRIPT"
-	TrackerResourceTypeIframe     TrackerResourceType = "IFRAME"
-	TrackerResourceTypeImage      TrackerResourceType = "IMAGE"
-	TrackerResourceTypeStylesheet TrackerResourceType = "STYLESHEET"
-	TrackerResourceTypeFont       TrackerResourceType = "FONT"
-	TrackerResourceTypeBeacon     TrackerResourceType = "BEACON"
-	TrackerResourceTypeFetch      TrackerResourceType = "FETCH"
-	TrackerResourceTypeMedia      TrackerResourceType = "MEDIA"
+	TrackerResourceTypeScript        TrackerResourceType = "SCRIPT"
+	TrackerResourceTypeIframe        TrackerResourceType = "IFRAME"
+	TrackerResourceTypeImage         TrackerResourceType = "IMAGE"
+	TrackerResourceTypeStylesheet    TrackerResourceType = "STYLESHEET"
+	TrackerResourceTypeFont          TrackerResourceType = "FONT"
+	TrackerResourceTypeBeacon        TrackerResourceType = "BEACON"
+	TrackerResourceTypeFetch         TrackerResourceType = "FETCH"
+	TrackerResourceTypeMedia         TrackerResourceType = "MEDIA"
+	TrackerResourceTypeServiceWorker TrackerResourceType = "SERVICE_WORKER"
 )
 
 func TrackerResourceTypes() []TrackerResourceType {
@@ -42,6 +43,7 @@ func TrackerResourceTypes() []TrackerResourceType {
 		TrackerResourceTypeBeacon,
 		TrackerResourceTypeFetch,
 		TrackerResourceTypeMedia,
+		TrackerResourceTypeServiceWorker,
 	}
 }
 
@@ -77,6 +79,8 @@ func (s *TrackerResourceType) Scan(value any) error {
 		*s = TrackerResourceTypeFetch
 	case TrackerResourceTypeMedia:
 		*s = TrackerResourceTypeMedia
+	case TrackerResourceTypeServiceWorker:
+		*s = TrackerResourceTypeServiceWorker
 	default:
 		return fmt.Errorf("invalid TrackerResourceType value: %q", v)
 	}
@@ -92,7 +96,8 @@ func (s TrackerResourceType) Value() (driver.Value, error) {
 		TrackerResourceTypeFont,
 		TrackerResourceTypeBeacon,
 		TrackerResourceTypeFetch,
-		TrackerResourceTypeMedia:
+		TrackerResourceTypeMedia,
+		TrackerResourceTypeServiceWorker:
 		return string(s), nil
 	default:
 		return nil, fmt.Errorf("invalid TrackerResourceType: %s", s)

pkg/coredata/tracker_type.go

@@ -26,6 +26,7 @@ const (
 	TrackerTypeLocalStorage   TrackerType = "LOCAL_STORAGE"
 	TrackerTypeSessionStorage TrackerType = "SESSION_STORAGE"
 	TrackerTypeIndexedDB      TrackerType = "INDEXED_DB"
+	TrackerTypeCacheStorage   TrackerType = "CACHE_STORAGE"
 )
 
 func TrackerTypes() []TrackerType {
@@ -34,6 +35,7 @@ func TrackerTypes() []TrackerType {
 		TrackerTypeLocalStorage,
 		TrackerTypeSessionStorage,
 		TrackerTypeIndexedDB,
+		TrackerTypeCacheStorage,
 	}
 }
 
@@ -61,6 +63,8 @@ func (s *TrackerType) Scan(value any) error {
 		*s = TrackerTypeSessionStorage
 	case TrackerTypeIndexedDB:
 		*s = TrackerTypeIndexedDB
+	case TrackerTypeCacheStorage:
+		*s = TrackerTypeCacheStorage
 	default:
 		return fmt.Errorf("invalid TrackerType value: %q", v)
 	}
@@ -72,7 +76,8 @@ func (s TrackerType) Value() (driver.Value, error) {
 	case TrackerTypeCookie,
 		TrackerTypeLocalStorage,
 		TrackerTypeSessionStorage,
-		TrackerTypeIndexedDB:
+		TrackerTypeIndexedDB,
+		TrackerTypeCacheStorage:
 		return string(s), nil
 	default:
 		return nil, fmt.Errorf("invalid TrackerType: %s", s)

pkg/server/api/console/v1/graphql/cookie_banner.graphql

@@ -52,6 +52,10 @@ enum TrackerType
         @goEnum(
             value: "go.probo.inc/probo/pkg/coredata.TrackerTypeIndexedDB"
         )
+    CACHE_STORAGE
+        @goEnum(
+            value: "go.probo.inc/probo/pkg/coredata.TrackerTypeCacheStorage"
+        )
 }
 
 enum CookieBannerOrderField
@@ -332,6 +336,10 @@ enum TrackerResourceType
         @goEnum(
             value: "go.probo.inc/probo/pkg/coredata.TrackerResourceTypeMedia"
         )
+    SERVICE_WORKER
+        @goEnum(
+            value: "go.probo.inc/probo/pkg/coredata.TrackerResourceTypeServiceWorker"
+        )
 }
 
 enum TrackerResourceOrderField

pkg/server/api/cookiebanner/v1/handler.go

@@ -423,6 +423,8 @@ func (h *Handler) handleReportDetectedTrackers(w http.ResponseWriter, r *http.Re
 			storageType = coredata.TrackerTypeSessionStorage
 		case "indexed_db":
 			storageType = coredata.TrackerTypeIndexedDB
+		case "cache_storage":
+			storageType = coredata.TrackerTypeCacheStorage
 		default:
 			continue
 		}
@@ -457,6 +459,8 @@ func (h *Handler) handleReportDetectedTrackers(w http.ResponseWriter, r *http.Re
 			resourceType = coredata.TrackerResourceTypeFetch
 		case "media":
 			resourceType = coredata.TrackerResourceTypeMedia
+		case "service_worker":
+			resourceType = coredata.TrackerResourceTypeServiceWorker
 		default:
 			continue
 		}

pkg/server/api/mcp/v1/specification.yaml

@@ -9450,7 +9450,7 @@ components:
           description: Cookie category ID
         tracker_type:
           type: string
-          enum: [COOKIE, LOCAL_STORAGE, SESSION_STORAGE, INDEXED_DB]
+          enum: [COOKIE, LOCAL_STORAGE, SESSION_STORAGE, INDEXED_DB, CACHE_STORAGE]
           description: Type of tracker
         pattern:
           type: string
@@ -9522,7 +9522,7 @@ components:
           description: Cookie category ID
         resource_type:
           type: string
-          enum: [SCRIPT, IFRAME, IMAGE, STYLESHEET, FONT, BEACON, FETCH, MEDIA]
+          enum: [SCRIPT, IFRAME, IMAGE, STYLESHEET, FONT, BEACON, FETCH, MEDIA, SERVICE_WORKER]
           description: Type of tracked resource
         origin:
           type: string
@@ -10046,7 +10046,7 @@ components:
           $ref: "#/components/schemas/GID"
         tracker_type:
           type: string
-          enum: [COOKIE, LOCAL_STORAGE, SESSION_STORAGE, INDEXED_DB]
+          enum: [COOKIE, LOCAL_STORAGE, SESSION_STORAGE, INDEXED_DB, CACHE_STORAGE]
         pattern:
           type: string
         match_type:
@@ -10186,7 +10186,7 @@ components:
           $ref: "#/components/schemas/GID"
         resource_type:
           type: string
-          enum: [SCRIPT, IFRAME, IMAGE, STYLESHEET, FONT, BEACON, FETCH, MEDIA]
+          enum: [SCRIPT, IFRAME, IMAGE, STYLESHEET, FONT, BEACON, FETCH, MEDIA, SERVICE_WORKER]
         origin:
           type: string
         path: