fix(pwa): never delete a CacheStorage entry this app doesn't own

[qnbs]

User description

Summary

First implementation slice of a post-#512 deep audit (release-safety remediation program — see the audit findings labeled DA-01 through DA-06; this PR fixes the release-blocking cache-deletion finding).

public/sw.js's cache cleanup was not positively ownership-scoped:

• Non-Tauri activate() deleted any cache not exactly equal to one of the 3 current-version names — not a prefix/ownership check.
• IS_TAURI branch of activate() deleted every single cache on the origin, unconditionally, justified only by an unverified assumption that Tauri's WebView origin is exclusive to this app.
• CLEAR_CACHE message handler also deleted every cache unconditionally.

The app is deployed to https://qnbs.github.io/WorldScript-Studio/ — a shared-origin GitHub Pages project page. CacheStorage is origin-scoped, not path-scoped, so any other qnbs.github.io/<other-repo>/ app's caches were deletable by all three paths. A version bump (exactly what a release does) changes APP_VERSION, which changes the "current" names, which triggers the over-broad activate cleanup on every returning client — making this directly release-relevant, not a theoretical edge case.

Fix

Added isWorldScriptOwnedCache(name), matching the exact closed set of cache-name families this SW actually creates (worldscript-static-v, worldscript-dynamic-v, worldscript-images-v) — deliberately narrower than a blanket startsWith('worldscript-'), which could still false-positive-match an unrelated cache from some other tool. Applied to all three deletion sites:

• non-Tauri activate(): prune only owned-and-stale (unchanged behavior for owned caches; foreign caches now always survive).
• IS_TAURI branch: no evidence the Tauri origin is exclusive, so the same predicate applies rather than assuming and deleting everything.
• CLEAR_CACHE: clears owned caches of any generation, never anything foreign.

Test plan

• New tests/unit/serviceWorkerCacheOwnership.test.ts — a Node vm-based harness loads the realpublic/sw.js source and executes its realactivate/message handlers against a mocked caches/self, proving (both browser and Tauri code paths): current owned caches survive activation; stale owned generations are pruned; foreign caches always survive both activate and CLEAR_CACHE; owned caches are fully cleared by CLEAR_CACHE; a failed owned-cache deletion never causes a foreign cache to be deleted as a side effect.
• Verified all 7 assertions genuinely fail against the pre-fix code (stashed the fix, re-ran, confirmed 7/7 failures, restored the fix) — proving the tests are real regression proof, not vacuous.
• pnpm run lint — clean (2 pre-existing, already-documented infos, unrelated to this change)
• pnpm exec tsgo --project tsconfig.tsgo.json --noEmit --checkers 4 — clean (exact CI command)
• pnpm run ci:prepush — full local admission green
• git diff --check — clean
• QNBS-v3 one-physical-line self-check — clean
• Commits SSH-signed

Summary by Sourcery

Protect unrelated CacheStorage entries by limiting all application cleanup paths to positively identified WorldScript Studio caches.

Bug Fixes:

• Restrict service worker and Tauri cache cleanup to the exact cache names owned by WorldScript Studio, preserving unrelated caches on shared origins.
• Prevent cache names that merely share an ownership prefix from being deleted.

Enhancements:

• Expose the cache ownership check for consistent use during Tauri teardown.

Documentation:

• Update documented test counts to reflect the added coverage.

Tests:

• Add regression coverage for browser and Tauri activation cleanup, clear-cache behavior, prefix collisions, and deletion failures.

---

CodeAnt-AI Description

Protect unrelated app caches during service worker cleanup

What Changed

• Service worker activation now removes only stale caches created by WorldScript Studio.
• Tauri cleanup and the “clear cache” action now preserve caches belonging to other apps on the same origin.
• Added coverage for browser and Tauri cleanup, including cache deletion failures, and updated documented test totals.

Impact

✅ Foreign app caches survive service worker updates
✅ Clear-cache actions no longer remove unrelated offline data
✅ Safer cache cleanup when a deletion fails

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Summary by CodeRabbit

• Bug Fixes

  • Improved service worker cache cleanup to remove only application-owned caches.
  • Preserved caches belonging to other services during activation, cleanup, and cache-clearing actions.
  • Added safer handling when cache deletion fails.

• Tests

  • Added coverage for cache ownership, cleanup scenarios, foreign-cache preservation, and deletion failures.

• Documentation

  • Updated documented test metrics to reflect the latest totals.

[codeant-ai]

🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	8f68d63	Aug 26, 2026 · 18:22	18:25

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Project	Deployment	Actions	Updated (UTC)
worldscript-studio	Ready	Preview	Aug 26, 2026 6:55pm

[sourcery-ai]

Reviewer's Guide

The service worker now uses an exact ownership allowlist at every cache-deletion site, protecting unrelated CacheStorage entries on shared origins while retaining the intended stale-cache cleanup and user-triggered owned-cache clearing. A VM-based regression suite exercises the real handlers across browser and Tauri paths, and README test metrics are updated.

Sequence diagram for ownership-scoped service worker cache cleanup

sequenceDiagram
participant Browser as Browser_or_Tauri
participant SW as ServiceWorker
participant Storage as CacheStorage
Browser->>SW: activate
SW->>Storage: keys()
Storage-->>SW: cache names
alt Tauri
SW->>Storage: delete(owned cache names)
else Browser
SW->>Storage: delete(owned stale cache names)
end
Storage-->>SW: deletion results
Note over SW,Storage: Foreign cache names are never deleted

Loading

Sequence diagram for owned-cache clearing

sequenceDiagram
participant User as User_or_App
participant SW as ServiceWorker
participant Storage as CacheStorage
User->>SW: CLEAR_CACHE
SW->>Storage: keys()
Storage-->>SW: cache names
SW->>Storage: delete(owned cache names)
Storage-->>SW: deletion results
SW-->>User: CACHE_CLEARED

Loading

Flow diagram for service worker cache ownership filtering

flowchart TD
A[Cache name discovered] --> B{isWorldScriptOwnedCache(name)}
B -->|No| C[Preserve foreign cache]
B -->|Yes| D{Cleanup mode}
D -->|activate browser| E{Current cache name?}
E -->|Yes| F[Preserve current owned cache]
E -->|No| G[Delete stale owned cache]
D -->|activate Tauri or CLEAR_CACHE| H[Delete owned cache]

Loading

File-Level Changes

Change	Details	Files
Restrict all service-worker cache deletion to cache families positively owned by WorldScript.	Define an exact allowlist for the static, dynamic, and image cache-name families. Filter Tauri activation cleanup to owned caches instead of deleting every origin cache. Filter browser activation cleanup to owned stale caches while preserving current caches. Filter CLEAR_CACHE to remove all owned generations but no foreign caches.	public/sw.js
Add regression coverage that executes the real service worker against mocked CacheStorage in browser and Tauri scenarios.	Load and evaluate public/sw.js with a Node VM harness and invoke its real handlers. Verify current and stale owned-cache behavior, foreign-cache preservation, and CLEAR_CACHE semantics. Cover deletion failures to ensure they cannot trigger foreign-cache deletion.	tests/unit/serviceWorkerCacheOwnership.test.ts
Synchronize documented test metrics with the newly added test file and assertions.	Update reported test and test-file counts throughout the README.	README.md

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[amazon-q-developer]

✅ Security Fix Approved — Release-Blocker Resolved

This PR successfully fixes the critical cache-deletion vulnerability identified in the post-#512 audit (DA-03). The implementation correctly prevents the service worker from deleting caches owned by other applications on the shared GitHub Pages origin.

Implementation Quality

Security fix: The isWorldScriptOwnedCache() predicate correctly scopes ownership to the exact cache families this app creates, preventing shared-origin cache collisions.

Test coverage: 7 comprehensive tests validate all three deletion paths (non-Tauri activate, Tauri activate, CLEAR_CACHE) and prove foreign caches survive both normal operation and error conditions. Tests verified to fail against pre-fix code.

Documentation: README accurately reflects test count updates (7121+ tests / 581 files).

Release Safety

All three cache deletion paths are now properly scoped:

• ✅ Non-Tauri activate() prunes only owned-and-stale caches
• ✅ Tauri activate() applies the same ownership predicate (no longer assumes origin exclusivity)
• ✅ CLEAR_CACHE message handler clears only owned caches

This change is safe to merge and ready for the next release.

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🏁 CodeAnt Quality Gate Results

Commit:bfd738da
Scan Time: 2026-08-26 18:55:02 UTC

✅ Overall Status: PASSED

Quality Gate Details

Quality Gate	Status	Details
Secrets	✅ PASSED	0 secrets found
Duplicate Code	✅ PASSED	0.0% duplicated
SAST	✅ PASSED	No security issues
Bugs	✅ PASSED	Rating S: No bugs
IAC	✅ PASSED	No IAC issues

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📥 Commits

Reviewing files that changed from the base of the PR and between 8f68d63 and bfd738d.

📒 Files selected for processing (5)

• README.md
• public/sw.js
• register-sw.ts
• tests/unit/registerSwCacheOwnership.test.ts
• tests/unit/serviceWorkerCacheOwnership.test.ts

📝 Walkthrough

Walkthrough

The service worker now deletes only WorldScript-owned caches during Tauri cleanup, activation pruning, and CLEAR_CACHE. New VM-based tests cover preservation of foreign caches and deletion failures. README test metrics now report 7,121+ tests across 581 files.

Changes

Cache ownership cleanup

Layer / File(s)	Summary
Owned-cache cleanup filtering public/sw.js	The service worker identifies WorldScript-owned cache prefixes and applies the filter to Tauri cleanup, activation pruning, and CLEAR_CACHE.
Cache cleanup regression coverage tests/unit/serviceWorkerCacheOwnership.test.ts, README.md	Tests verify owned-cache deletion, foreign-cache preservation, and failure handling. README metrics now report 7,121+ tests across 581 files.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk:🔵 Low · up to 8f68d

The service worker now limits cleanup to WorldScript cache prefixes, but names that share those prefixes can still be treated as owned and deleted, potentially removing another app’s cached data on the shared origin. The PR is mergeable with explicit owner awareness and should tighten the cache-name validation.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: preventing the app from deleting CacheStorage entries that it does not own.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Inline comments:
In `@public/sw.js`:
- Around line 18-19: Update isWorldScriptOwnedCache to recognize only valid
WorldScript cache names, requiring the expected cache-name format and version
suffix rather than merely matching an OWNED_CACHE_FAMILIES prefix. Preserve
ownership detection for legitimate WorldScript caches while excluding names such
as worldscript-static-vendor-cache from activation and CLEAR_CACHE deletion.

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