proton-stream/README.md

# proton-stream

A Netflix-style cross-platform client for **Proton Drive public links**.

Paste a share URL and its password; get a browsable, streamable library. No
Proton account, no server to host, no download step — episodes start playing in
seconds and the seek bar works.

Built on [`proton-sdk-rs`](https://github.com/narrrl/proton-sdk-rs), a pure-Rust
Proton Drive SDK.

## Why it works

A Proton Drive file's content blocks are each a self-contained PGP packet
decrypted under one shared session key. There is no sequential streaming session
to resume, so seeking costs exactly the blocks the seek lands on — a 2 GB episode
is playable without downloading 2 GB of it.

## Status

Early, but it is an app now: the picture lands **inside the window**, not in an
mpv window of its own. The SDK streaming surface, the catalog, the streaming
layer and the player are done and verified against a real share, and the app has
a library wall, a page per title with seasons and episodes,
resume-where-you-left-off, an overlay with a chapter-marked seek bar, a skip
button for openings and endings, next/previous episode with an "up next"
countdown, optional metadata, themes and share management. What is left is mostly sidecar subtitle files
(`.srt`/`.ass` beside the video are invisible to the crawl today) and running the
macOS packaging on a real Mac. See `docs/DEVELOPMENT.md`.

A native Android 12+ client is under `android/`, sharing the Rust catalog and
streaming implementation through UniFFI. It features a modern Material 3 interface,
an immersive fullscreen player with auto-hiding controls, and offline downloads.
Its toolchain, emulator, signing, and release instructions are in [`docs/ANDROID.md`](docs/ANDROID.md).

```bash
cargo run --release -p pstr-app          # the app
proton-stream 'https://drive.proton.me/urls/TOKEN#fragment'   # open the Add form with a link
```

One window at a time: a second launch brings the open window forward and
hands it any share link it was given, then exits.

The `pstr` CLI does the same work headlessly, and is what tells you which layer
is broken:

```bash
cargo run -p pstr-cli -- add --name anime 'https://drive.proton.me/urls/TOKEN#fragment'
cargo run -p pstr-cli -- crawl
cargo run -p pstr-cli -- list
cargo run -p pstr-cli -- metadata                      # opt-in; off unless configured
cargo run --release -p pstr-cli -- play --file Frieren --disk-cache
cargo run --release -p pstr-cli -- bench --file Frieren --verify
```

On a 761 MiB, 26-minute 1080p HEVC episode over a real password-protected link:
**2.3 s to first frame, ~1.5 s to resume after dragging to an arbitrary point,
61 MiB fetched for the first 38 seconds of playback.** Watch it again and the
disk cache serves it with **no network at all** — 0.3 s to first frame.

`bench` measures the same file without a player, reporting cold seek latency,
sustained throughput and peak memory, and `--verify` cross-checks a mid-file read
against the SDK's own range download.

## Design

| | |
|---|---|
| Topology | Fat client. No server; each viewer's app talks to Proton directly. |
| Auth | Public links only — but several, merged into one library. |
| Player | Embedded libmpv, drawing into the app's own GL surface: HEVC 10-bit, HDR and ASS subtitles with hardware decode. Volume, audio-track, subtitle and chapter pickers; skip-the-opening; next/previous episode and autoplay. The language picked is preferred for the next file too. |
| Transcoding | None. mpv demuxes and decodes natively. |
| UI | egui/eframe on glow; mpv renders into the same GL context. |
| Themes | The shipped near-black palette, Catppuccin Latte, Frappé, Macchiato and Mocha, and a Persona 5 one — black, white and one loud red, which is what the Red accent is there for — each with a choice of nine accents, drawn as a gradient unless you turn that off. Picked on the Settings page, applied without a restart. |
| Metadata | Filename parsing, with optional AniList/TMDB enrichment — **off by default**, because enabling it sends your library's titles to a third party. It brings posters, synopses, fanart and per-episode titles and synopses (for AniList, from ani.zip, which is sent the matched ids); a title the scorer refuses to guess about can be pinned by hand, and a pinned match is never overwritten. The library sorts by name, watch, add or air date, rating and popularity, folds a franchise into one tile, and shelves titles by director, studio and genre. See [docs/METADATA.md](docs/METADATA.md). |
| Platforms | Linux and Windows; macOS packaging is written but has not been run on a Mac. A native Android 12+ client is available featuring a Material 3 UI and immersive fullscreen playback. |

## Building

Rust 2024, MSRV 1.96.

```bash
cargo build --release
```

`pstr-player` needs libmpv development headers (`mpv` ≥ 2.0). On Windows those
come from the separate **mpv-dev** archive rather than mpv's player build, and
`libmpv-2.dll` ships next to the executable. The Proton SDK crates come from
crates.io; nothing here builds against a sibling checkout.

Installable artifacts — tarball, `.deb`, `.rpm`, Arch package, `.app`/`.dmg`,
and a portable `.zip` plus an `.msi` on Windows — are produced by
`scripts/build.sh` and `scripts\build.ps1`; `packaging/README.md` has the
per-platform detail.

Android builds use JDK 17, Android SDK 36/NDK 28, Gradle 8.13, `cargo-ndk`, and
UniFFI. Run `bash scripts/build-android.sh debug` after installing that toolchain;
see [`docs/ANDROID.md`](docs/ANDROID.md) for exact setup and release signing.

## Privacy

- The share URL fragment **is** the decryption password. It and any custom
  password live in the OS credential store — Secret Service on Linux, Credential
  Manager on Windows — never in a config file.
- Nothing leaves your machine except requests to Proton, unless you turn metadata
  enrichment on. The player is fed through an in-process mpv stream callback, not
  a local HTTP server: there is no port for another process on the machine to ask
  for the plaintext, and mpv is handed an opaque token rather than a URL that
  would put a share secret in its log and window title.
- The block cache holds decrypted content. It lives in your cache directory,
  can be deleted at any time the app is not running, and can be sized or
  emptied from Settings → Storage.
- A share link given as a command-line argument is visible to other users of
  the machine in the process list while that launch runs, and may land in
  shell history. Pasting it into the window (Ctrl+V) does neither.
- The desktop's media widget is handed the title, the episode and a `file://`
  path to artwork already on disk — never a provider URL, so the shell never
  contacts a metadata provider on its own.

## License

The shared Rust crates and desktop application are MIT licensed. The Android
application and its combined native distribution are GPL-3.0-or-later; see
[`android/LICENSE.md`](android/LICENSE.md) and the bundled-component notices.
The desktop application embeds the Inter typeface, under the SIL Open Font
License 1.1 ([`crates/pstr-app/assets/fonts/Inter-OFL.txt`](crates/pstr-app/assets/fonts/Inter-OFL.txt)),
and the Phosphor icon font, under MIT.