Both store modules are rewritten from a protocol-level spec: new Rust engines behind a small JNI surface (nativeCall/nativeInstall) and thin Kotlin facades, with the launcher's own user agent.
Epic: sign-in carries over, library, manifest download with byte-exact verification, assembly, uninstall, launch arguments, achievements.
Amazon: sign-in carries over, library, manifest download with per-file hash checks, path checks, executable detection from fuel.json, uninstall.
On-disk install layout is unchanged, so existing installs keep working.
Store game pages now take controller focus on their lead hero action (Install, Uninstall, Pause, Resume, Get, Buy), fall back to Back, and keep D-pad focus inside the page while it covers the library.
Space checks before Epic, GOG and Amazon installs (measured zero vs unknown), clear failure reasons with retry/clear, resume-aware checks, and safe per-file replacement so a failed or cancelled update never breaks an installed game.
Epic installs stream chunks straight into staged files in parallel (most bytes written once, a small budgeted cache for shared chunks, about 1x game size instead of 2x), pace updates by free space, and keep the lookahead, batch and bounded Java writers as hidden alternatives.
Co-authored-by: Juan Marti Mercado <juanma@microsoft.com>
Co-authored-by: The412Banner <the412banner@users.noreply.github.com>
The stores' sign-ins (files/stores/<store>/credentials.json: access and refresh
tokens, account id and name) were plain JSON. Other apps could not read them, but
every program in the Linux session runs as the app and could. They are now sealed
with AES-256-GCM under a non-exportable AndroidKeyStore key (StrongBox when the
device has one), so the session only ever sees ciphertext.
- Format: a versioned envelope {v, alg, iv, ct}, written atomically and readable
only by the app. No new dependencies (javax.crypto and KeyStore).
- Migration: an existing plaintext file is sealed at the next start, checked by
decrypting it, then the plaintext is removed; users stay signed in.
- No Keystore on the device: the file stays plain and the log says so once per
start.
- A sealed file that can never be opened (tampered, key gone or invalidated,
broken envelope) is removed and that store asks for sign-in again. A transient
Keystore error keeps the file and retries.
A Stores section (rail, under Games; Setup › Stores gate) with each store's sign-in,
library, storefront shelves and a download queue. Each store has two tabs, Store and
Library, and Library filters to All or Installed; libraries open from a saved copy
and refresh in the background, with install sizes on every card. Games install to internal storage,
or a card chosen at Install time, and are registered in the Steam client as non-Steam
games, so they launch through Steam and droiddeck-proton from either the front end or
the client.
- Downloads: GOG, Epic and Amazon engines in Rust (app/src/main/rust/stores, built by
cargo-ndk, nothing compiled in the tree). One adaptive fetch core with a latency
brake, stalled-host handoff and every CDN a store offers. Per-stage progress,
pause/resume, two-step cancel that deletes, failed downloads kept for retry, a
foreground service with Wi-Fi and wake locks and notification controls.
- Games tab: store source chips (Steam, GOG, Epic, Amazon, Custom) and store art.
- Epic: per-launch exchange code from the app and from Steam's Play button,
"Epic sign-in (EOS)", "Launch offline", and a game's web links opened in Android's
browser for EOS consent. The EOS overlay crashed games and is left out.
- Cloud saves (GOG, Epic): pulled before launch, pushed after the game or the session
ends, no upload before a first download, conflicts never overwritten, backups both
ways.
- Logs: every store line redacted; the engine log goes to daily files.
The412Banner