Reviewer audit found two real risks in the prior amendment:
1. LEGACY_FILE_WALLPAPER_RE was too permissive. Any file:// URL
containing /wallpapers/wallpaperN.jpg would match — including a user's
own file at /home/me/wallpapers/wallpaper1.jpg that happened to share
the name pattern. Silent data-loss potential: user's photo replaced
with a bundled asset. In-app upload flow uses data: URIs today so it
can't actually produce such a value, but the regex should be tight
on intent. Now requires a known install-layout segment:
resources/[assets/]wallpapers/ (packaged) or public/wallpapers/ (dev).
2. No upper bound on \d+. A corrupted or future-schema project with
wallpaper99.jpg was silently rewritten to /wallpapers/wallpaper99.jpg
which 404s. Now validates against WALLPAPER_PATHS; out-of-set
bundled-looking values fall back to DEFAULT_WALLPAPER.
Also applied R2.2 defensive guard: resolveImageWallpaperUrl's catch
block now checks instanceof BackgroundLoadError and rethrows unchanged
instead of wrapping a second time. Current getAssetPath cannot throw
BackgroundLoadError so this is a future-proof against refactors.
Tests: 56 pass (up from 54). Added coverage for "user file outside
install dir stays untouched" and "bundled-looking but out-of-set falls
back to default".
R1 — Persisted wallpaper is now always the canonical /wallpapers/wallpaperN.jpg
form, never the resolved file:// URL. Swatch clicks pass WALLPAPER_PATHS[i]
(the relative path) to onWallpaperChange; the resolved URL stays in
wallpaperPreviewUrls for rendering only. This prevents machine-specific paths
from being written into project JSON and avoids break-on-upgrade /
break-on-share regressions. Legacy projects carrying resolved file:// URLs are
rewritten by a new normalizer in normalizeProjectEditor:
file://…(/assets)?/wallpapers/wallpaperN.jpg → /wallpapers/wallpaperN.jpg.
R2 — resolveImageWallpaperUrl now catches anything getAssetPath throws
(UnsafeAssetPathError, AssetBaseUnavailableError) and rewraps as
BackgroundLoadError with the original as cause. Callers (videoExporter retry
loop, gifExporter catch, VideoEditor toast) only need one instanceof check and
users always see the translated errors.exportBackgroundLoadFailed toast.
R3 — src/vite-env.d.ts no longer duplicates Window.electronAPI. The interface
had drifted — renderer declaration was missing readBinaryFile, getPlatform,
revealInFolder, getShortcuts, saveShortcuts, hudOverlay*, countdown overlay
methods that electron-env.d.ts already declares. Removed the duplicate and
kept the triple-slash reference so the authoritative declaration is the one
in electron/electron-env.d.ts.
N1 — GRADIENT_RE accepts optional "repeating-" prefix so
repeating-linear/radial/conic-gradient values classify as gradients instead
of falling through to color.
N2 — displayBasename returns "(unknown)" sentinel for URLs without a
meaningful basename (file:///, bare /) instead of leaking the original string.
N3 — electron-builder.json5 extraResources block gets an inline comment
pointing at preload.ts:assetBaseDir so the bidirectional coupling is
discoverable from either file.
Tests: 54 unit tests pass (up from 35). New coverage for repeating
gradients, displayBasename sentinels, BackgroundLoadError cause wrapping,
legacy file:// wallpaper normalization (5 cases).
Every consumer of /wallpapers/*.jpg — SettingsPanel, VideoPlayback,
frameRenderer — was doing async IPC round trips, useEffect dances, and
Promise.all for a value that is a build-time constant per process. Each
consumer showed briefly-empty or briefly-404ing state on first paint
until the handler's reply resolved.
The asset base URL depends only on process.defaultApp and
process.resourcesPath / __dirname — all available in preload at
context-bridge time. Compute once there, expose as a sync string.
- preload.ts resolves baseDir (process.resourcesPath packaged,
<appRoot>/public unpackaged) and emits assetBaseUrl synchronously.
- get-asset-base-path IPC handler + main-process branching deleted.
- getAssetPath() is now sync. Returns string, not Promise<string>.
Throws AssetBaseUnavailableError (new) when electronAPI.assetBaseUrl
is missing — catastrophic preload failure, not silent 404.
- resolveImageWallpaperUrl() sync; same sync throw semantics.
- SettingsPanel: Promise.all + useState + useEffect collapse to one
useMemo. First paint has real URLs, no 18× ERR_FILE_NOT_FOUND, no
flicker.
- VideoPlayback: wallpaper-resolve useEffect collapses to useMemo.
- frameRenderer.setupBackground: drops the await.
- electronAPI type decls updated in both .d.ts files.
- 35 unit tests updated to reflect sync signature + new
AssetBaseUnavailableError contract.
Silent-fallback behavior from getAssetPath (returning /relative when
electronAPI failed) is gone. Renderers now surface preload failures
instead of rendering 404s.
SettingsPanel fell back to rendering WALLPAPER_PATHS (raw
/wallpapers/*.jpg strings) during the brief window before the
resolveImageWallpaperUrl effect populated wallpaperPaths. In packaged
Electron the browser resolved those against a file:// origin, producing
18 ERR_FILE_NOT_FOUND requests per load / reload. The second render
replaced them with correct URLs, so swatches appeared — but the wasted
requests showed up in devtools and churned the network panel.
Drop the fallback; render nothing until the effect completes. The
resolution is effectively instant and avoids the empty-origin round
trip.
Adversarial review surfaced four defects and four drive-bys. All applied:
B1 (security, MEDIUM) — Path traversal via encodeRelativeAssetPath.
encodeURIComponent passed "." and ".." through unchanged; percent-encoded
"%2e%2e" got decoded by the URL constructor. Either form escaped the
asset root: new URL("../../etc/passwd", "file:///opt/Openscreen/resources/")
→ file:///opt/etc/passwd. Reject both at src/lib/assetPath.ts via a new
UnsafeAssetPathError thrown when a decoded segment equals "." or "..".
B2 (correctness) — classifyWallpaper returned { kind: "image" } for
conic-gradient(...), rgb(...), hsl(...), oklch(...), empty string,
and named colors like "red". Old frameRenderer's bare fillStyle = value
handled these; new code would throw BackgroundLoadError with misleading
message. Classification now anchors on regexes, accepts all CSS color
functions and all three gradient types, treats unknown strings as
fallthrough color (old behavior), and normalizes "" to "#000000".
B3 (SSOT) — DEFAULT_WALLPAPER, projectPersistence.WALLPAPER_PATHS, and
SettingsPanel.WALLPAPER_RELATIVE independently hardcoded the same
/wallpapers/wallpaperN.jpg pattern. Three drift sites collapse into one:
WALLPAPER_PATHS lives in src/lib/wallpaper.ts, DEFAULT_WALLPAPER derives
from WALLPAPER_PATHS[0], projectPersistence re-exports from the canonical
module, SettingsPanel imports it directly.
B4 (privacy) — BackgroundLoadError.message and the translated toast
surfaced full file paths like file:///home/<user>/…/wallpaper.jpg —
leaks the user's home directory in copy-pasted bug reports. Added a
displayUrl getter that returns just the basename (or "data:…" for data
URIs), wired into the toast. Full URL remains in console.error and
error.url for debugging.
N1 — resolveImageWallpaperUrl now rejects image paths that don't live
under /wallpapers/ (throws BackgroundLoadError). Narrows the blast
radius of the returned <resourcesPath>/ base so the renderer can only
request files within the wallpapers directory, regardless of what the
project JSON claims.
N2 — videoExporter retry loop no longer calls cleanup() twice in the
BackgroundLoadError branch; the finally handles it.
N3 — Browser tests assert BackgroundLoadError.url contains the failing
path. Guards the {{url}} i18n interpolation contract.
N4 — VideoPlayback wallpaper resolve effect now catches resolver
throws (UnsafeAssetPathError, BackgroundLoadError from /wallpapers/
prefix enforcement). Prevents the new strict-rejection logic from
silently leaving the preview without a background.
Tests: 35 unit tests pass (up from 20); new coverage for all color
functions, all gradient types, empty string, named color fallback,
whitespace trimming, /wallpapers/ prefix enforcement, traversal
rejection, percent-encoded traversal rejection, displayUrl basename
and data-URI abbreviation.
Three independent defects plus one SSOT violation caused reported symptom
of image wallpapers rendering solid black in exported MP4/GIF while
appearing correctly in the editor preview.
Bug A — Dev-mode IPC handler returned <appPath>/public/assets/, but
wallpapers live at public/wallpapers/. No assets/ subdirectory exists in
source.
Bug B — FrameRenderer.setupBackground bypassed getAssetPath and did
window.location.origin + wallpaper, producing file:///wallpapers/*.jpg
404s in packaged Electron.
Bug C — setupBackground silently caught any background-load error and
filled black. Masked Bug B from the export pipeline; why the bug shipped.
Smell D — Asset layout asymmetric: public/wallpapers/ (dev) vs
resources/assets/wallpapers/ (packaged). assets/ subdirectory had no
other consumers.
Fixes:
- Unify asset layout. electron-builder extraResources now copies to
resources/wallpapers/ (no assets/). Main handler returns
<resourcesPath>/ packaged and <appPath>/public/ unpackaged. Same
convention in both modes: /wallpapers/x.jpg maps to <base>/wallpapers/x.jpg.
Nix package.nix mirror updated.
- New src/lib/wallpaper.ts module owns the wallpaper contract:
DEFAULT_WALLPAPER, classifyWallpaper (color/gradient/image), and
resolveImageWallpaperUrl (pure URL resolver, wraps getAssetPath).
BackgroundLoadError typed error for short-circuit detection.
- FrameRenderer.setupBackground uses the new helpers. Silent black
fallback removed; rethrows as BackgroundLoadError. Export pipeline
(VideoExporter + GifExporter) short-circuits encoder-retry loop on
BackgroundLoadError. VideoEditor catch site dispatches to translated
exportBackgroundLoadFailed toast.
- VideoPlayback editor preview consolidated onto the same helpers.
Three default-wallpaper path literals (useEditorHistory,
projectPersistence, VideoPlayback) collapsed onto DEFAULT_WALLPAPER.
- i18n: new errors.exportBackgroundLoadFailed key added to all seven
locales (en, zh-CN, zh-TW, es, fr, tr, ko-KR).
- Tests: 20 unit tests for wallpaper module (classifyWallpaper +
resolveImageWallpaperUrl branches + BackgroundLoadError).
videoExporter.browser.test.ts and gifExporter.browser.test.ts extended
with image-wallpaper happy path and BackgroundLoadError failure path.
Migration note: packaged users upgrading in place may retain an empty
resources/assets/ directory from the prior layout. Unreferenced at
runtime; cosmetic only. DMG/AppImage fresh installs get the new layout
directly.
- Remove trailing comma in SUPPORTED_LOCALES that caused Locale type to
include undefined, fixing all downstream type errors
- Remove unused webcamSizePreset from useMemo dependency array
- Use parsed.toString() instead of raw url in shell.openExternal per
Electron security best practice
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- derive available locales from locale folders with required namespace validation
- exclude incomplete locales and report missing namespace files
- align system-language suggestion and selectors with discovered locales
- improve launch HUD language menu interaction, scrolling, and viewport clipping
- make i18n-check discover locale folders automatically
Enriquefft