Migrate native builds to Dart code assets

.dockerignore

@@ -0,0 +1,4 @@
+.git
+**/.dart_tool
+**/build
+**/target

.github/workflows/build-android.yml

@@ -12,25 +12,30 @@ permissions:
 
 jobs:
   build:
+    name: Build with Java ${{ matrix.java }}
     runs-on: ubuntu-latest
     timeout-minutes: 45
+    strategy:
+      fail-fast: false
+      matrix:
+        java: [21, 25]
 
     steps:
       - uses: actions/checkout@v7.0.1
 
-      - name: Set up Java 21
+      - name: Set up Java ${{ matrix.java }}
         uses: actions/setup-java@v6.0.1
         with:
           distribution: temurin
-          java-version: 21
+          java-version: ${{ matrix.java }}
 
       - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@1.98.0
 
       - name: Cache Rust build
         uses: Swatinem/rust-cache@v2
         with:
-          workspaces: frosty_flutter/rust -> target
+          workspaces: frosty/rust -> target
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2.23.0
@@ -39,9 +44,9 @@ jobs:
           cache: true
 
       - name: Resolve Flutter example dependencies
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter pub get
 
       - name: Build Flutter Android release APK
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter build apk --release --no-pub

.github/workflows/build-ios.yml

@@ -19,12 +19,12 @@ jobs:
       - uses: actions/checkout@v7.0.1
 
       - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@1.98.0
 
       - name: Cache Rust build
         uses: Swatinem/rust-cache@v2
         with:
-          workspaces: frosty_flutter/rust -> target
+          workspaces: frosty/rust -> target
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2.23.0
@@ -33,9 +33,9 @@ jobs:
           cache: true
 
       - name: Resolve Flutter example dependencies
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter pub get
 
       - name: Build unsigned Flutter iOS release
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter build ios --release --no-codesign --no-pub

.github/workflows/build-linux.yml

@@ -19,12 +19,12 @@ jobs:
       - uses: actions/checkout@v7.0.1
 
       - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@1.98.0
 
       - name: Cache Rust build
         uses: Swatinem/rust-cache@v2
         with:
-          workspaces: frosty_flutter/rust -> target
+          workspaces: frosty/rust -> target
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2.23.0
@@ -46,9 +46,9 @@ jobs:
         run: dart build cli --target example/tweak_example.dart
 
       - name: Resolve Flutter example dependencies
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter pub get
 
       - name: Build Flutter Linux release
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter build linux --release --no-pub

.github/workflows/build-macos.yml

@@ -19,12 +19,12 @@ jobs:
       - uses: actions/checkout@v7.0.1
 
       - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@1.98.0
 
       - name: Cache Rust build
         uses: Swatinem/rust-cache@v2
         with:
-          workspaces: frosty_flutter/rust -> target
+          workspaces: frosty/rust -> target
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2.23.0
@@ -41,9 +41,9 @@ jobs:
         run: dart build cli --target example/tweak_example.dart
 
       - name: Resolve Flutter example dependencies
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter pub get
 
       - name: Build Flutter macOS release
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter build macos --release --no-pub

.github/workflows/build-web.yml

@@ -19,14 +19,14 @@ jobs:
       - uses: actions/checkout@v7.0.1
 
       - name: Set up Rust with WebAssembly target
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@1.98.0
         with:
           targets: wasm32-unknown-unknown
 
       - name: Cache Rust build
         uses: Swatinem/rust-cache@v2
         with:
-          workspaces: frosty_flutter/rust -> target
+          workspaces: frosty/rust -> target
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2.23.0
@@ -35,12 +35,12 @@ jobs:
           cache: true
 
       - name: Check Rust WebAssembly build
-        run: cargo check --locked --target wasm32-unknown-unknown --manifest-path frosty_flutter/rust/Cargo.toml
+        run: cargo check --locked --target wasm32-unknown-unknown --manifest-path frosty/rust/Cargo.toml
 
       - name: Resolve Flutter example dependencies
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter pub get
 
       - name: Build Flutter web release
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter build web --release --no-pub

.github/workflows/build-windows.yml

@@ -19,12 +19,12 @@ jobs:
       - uses: actions/checkout@v7.0.1
 
       - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@1.98.0
 
       - name: Cache Rust build
         uses: Swatinem/rust-cache@v2
         with:
-          workspaces: frosty_flutter/rust -> target
+          workspaces: frosty/rust -> target
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2.23.0
@@ -41,13 +41,9 @@ jobs:
         run: dart build cli --target example/tweak_example.dart
 
       - name: Resolve Flutter example dependencies
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter pub get
 
-      - name: Build secp256k1 for Windows
-        working-directory: frosty_flutter/example
-        run: dart run coinlib:build_windows
-
       - name: Build Flutter Windows release
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter build windows --release --no-pub

.github/workflows/test-analyze.yml

@@ -19,14 +19,14 @@ jobs:
       - uses: actions/checkout@v7.0.1
 
       - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@1.98.0
         with:
           components: rustfmt
 
       - name: Cache Rust build
         uses: Swatinem/rust-cache@v2
         with:
-          workspaces: frosty_flutter/rust -> target
+          workspaces: frosty/rust -> target
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2.23.0
@@ -38,12 +38,8 @@ jobs:
         working-directory: frosty
         run: dart pub get
 
-      - name: Resolve Flutter plugin dependencies
-        working-directory: frosty_flutter
-        run: flutter pub get
-
       - name: Resolve Flutter example dependencies
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter pub get
 
       - name: Verify Dart formatting
@@ -53,27 +49,15 @@ jobs:
         working-directory: frosty
         run: dart analyze --fatal-infos
 
-      - name: Analyze Flutter plugin
-        working-directory: frosty_flutter
-        run: flutter analyze --fatal-infos
-
       - name: Analyze Flutter example
-        working-directory: frosty_flutter/example
+        working-directory: frosty/example
         run: flutter analyze --fatal-infos
 
       - name: Verify Rust formatting
-        run: cargo fmt --check --manifest-path frosty_flutter/rust/Cargo.toml
+        run: cargo fmt --check --manifest-path frosty/rust/Cargo.toml
 
       - name: Check Rust library
-        run: cargo check --locked --manifest-path frosty_flutter/rust/Cargo.toml
-
-      - name: Build native library for Dart tests
-        run: cargo build --locked --manifest-path frosty_flutter/rust/Cargo.toml
-
-      - name: Install native library for Dart tests
-        run: |
-          mkdir -p frosty/build
-          cp frosty_flutter/rust/target/debug/libfrosty_rust.so frosty/build/
+        run: cargo check --locked --manifest-path frosty/rust/Cargo.toml
 
       - name: Run Dart tests
         working-directory: frosty

README.md

@@ -1,59 +1,39 @@
 # Frosty
 
-Frosty is a Dart library for generating FROST threshold Schnorr Signatures for
-secp256k1.
+Frosty is a Dart and Flutter library for generating FROST threshold Schnorr
+signatures for secp256k1 and Taproot.
 
-The Dart package is found under `frosty` and a flutter package is found under
-`frosty_flutter` which includes a flutter build of the underlying Rust library.
-The native Rust code is found under `frosty_flutter/rust`. Scripts for
-building the native libraries for Linux and Android are found in `scripts`,
-however `frosty_flutter` provides automatic builds for Linux, Android, macOS and
-iOS.
+The published package lives in `frosty/`. Its Rust crate is in `frosty/rust`
+and is compiled and bundled automatically on Android, iOS, Linux, macOS, and
+Windows by the Dart build hook using `code_assets` and
+`native_toolchain_rust`. Consumers therefore depend on `frosty` directly;
+there is no separate Flutter plugin package.
 
-Please see below for build instructions.
+Rust and rustup must be available on the development machine. The toolchain
+and supported targets are pinned in `frosty/rust/rust-toolchain.toml`.
 
-## Building and Installation
-
-If you are using Flutter, the `frosty_flutter` package contains support for
-automatic builds for different platforms. It requires Rust but otherwise should
-not require anything else.
-
-For pure Dart use, it is possible to build a Linux library. Library binaries
-must be built for the native Rust code.
-
-Podman or Docker can be used to build the binaries. This helps to provide a
-consistent and reliable build across machines.
-
-### Linux Builds
-
-The `scripts/build-linux.sh` script can be executed. An archive of the Linux
-library will be produced in `platform-build` and a copy will be placed in
-`frosty/build` so that the tests can be run in the `frosty` directory.
-
-During runtime, the shared library is expected to exist within a `$PWD/build/`
-directory or within the library paths.
-
-### Android Builds
-
-If you do not wish to use the automatic Android build with `frosty_flutter`, the
-`scripts/build-android.sh` script can be executed. An archive of the libraries
-for the armeabi-v7a and arm64-v8a architectures will be produced in
-`platform-build` as `jniLibs.tar.gz`. This can be extracted into the
-`android/app/src/main` directory of an Android flutter app.
+## Development
 
-### Apple Builds
+From the package directory:
 
-The `scripts/build-apple.sh` script will produce a universal framework for macOS
-and iOS into `platform-build` and a dylib will be created in the `frosty/build`
-directory for local testing. This script does not use Podman or Docker and
-requires the host machine to have Rust.
+```sh
+cd frosty
+dart pub get
+dart test
+dart analyze
+```
 
-## Development
+The package uses Coinlib 6 from pub.dev. Both native libraries are built and
+bundled through Dart code assets.
 
-Tests require the Linux Rust library in the `$PWD/build` directory.
+The build hook compiles the native library before tests or application builds.
+The Flutter app under `frosty/example/` exercises the same package and hook on
+all supported Flutter platforms. The Dart CLI examples live in that directory
+as well.
 
-If the Rust bindings need to be regenerated, `flutter_rust_bridge_codegen
-generate` should be run in the `frosty_flutter` directory.
+Web continues to use the checked-in wasm-bindgen output in `frosty/web/pkg`.
+Run `scripts/build-wasm.sh` to refresh those files.
 
-The `scripts/build-wasm.sh` script can be run to update the WASM output and web
-bindings for flutter use.
+To regenerate the bridge after changing the Rust API, run
+`flutter_rust_bridge_codegen generate` from `frosty/`. The WASM generator is
+the only remaining script because Dart code assets handle every native target.

frosty/CHANGELOG.md

@@ -1,3 +1,12 @@
+## Next
+
+- Replace the separate `frosty_flutter` plugin and Cargokit integration with a
+  `code_assets` build hook powered by `native_toolchain_rust`.
+- Require Dart 3.13 and Coinlib 6 with its native code-assets build hook.
+- Consolidate the Dart and Flutter examples under `frosty/example`.
+- Remove obsolete native build scripts; retain only the reproducible WASM
+  generator.
+
 ## 4.0.0
 
 - Update to flutter_rust_bridge 2.11.0 and fix to this version

frosty/README.md

@@ -10,5 +10,11 @@ The library uses the
 [frost-secp256k1-tr](https://crates.io/crates/frost-secp256k1-tr) Rust crate
 that implements that FROST scheme for Taproot.
 
-It requires a native Rust library to be loaded. A README.md for building this
-library can be found in the root of the repository.
+Call `await loadFrosty()` before using the API. On Android, iOS, Linux, macOS,
+and Windows, the package build hook compiles and bundles the Rust library
+automatically through Dart code assets. Rust and rustup must be installed on
+the development machine.
+
+Flutter applications depend on this package directly; a separate
+`frosty_flutter` plugin is not required. Web builds use the bundled
+wasm-bindgen files under `web/pkg`.

frosty/example/README.md

@@ -0,0 +1,4 @@
+# Frosty Flutter example
+
+Demonstrates using the `frosty` package directly from Flutter. The package's
+build hook compiles and bundles the Rust library for native targets.

frosty_flutter/example/analysis_options.yaml → frosty/example/analysis_options.yaml

@@ -7,6 +7,15 @@
 
 # The following line activates a set of recommended lints for Flutter apps,
 # packages, and plugins designed to encourage good coding practices.
+analyzer:
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 include: package:flutter_lints/flutter.yaml
 
 linter: