wip: try native assets

.github/workflows/flutter-ci.yml

@@ -32,6 +32,8 @@ jobs:
 
     steps:
       - uses: dart-lang/setup-dart@v1
+        with:
+          sdk: main
       - uses: actions/checkout@v3
         with:
           submodules: true
@@ -45,12 +47,6 @@ jobs:
       - name: Install pdfsig
         run: sudo apt-get install -y poppler-utils
 
-      - name: Install native
-        run: |
-          cargo build --release
-          echo "LD_LIBRARY_PATH=$(pwd)/target/release/" >> "$GITHUB_ENV"
-        working-directory: meesign_native/native/meesign-crypto
-
       - name: Setup server
         run: |
           wget https://raw.githubusercontent.com/crocs-muni/meesign-server/main/generate_keys.sh
@@ -62,7 +58,7 @@ jobs:
             crocsmuni/meesign:nightly
 
       - name: Run tests
-        run: cd meesign_core; dart test
+        run: cd meesign_core; dart --enable-experiment=native-assets test
 
 
   build:
@@ -108,7 +104,7 @@ jobs:
     - name: Clone Flutter repository with stable channel
       uses: subosito/flutter-action@v2
       with:
-        channel: stable
+        channel: main
         cache: true
 
     - name: Install Android dependencies
@@ -148,6 +144,9 @@ jobs:
         flutter config --enable-linux-desktop
         flutter config --enable-windows-desktop
 
+    - name: Enable native assets
+      run: flutter config --enable-native-assets
+
     # Fetch dart packages
     - run: flutter pub get
 

meesign_native/ffigen/meesign-crypto.yaml

@@ -8,3 +8,5 @@ headers:
   # so specify only the headers we need (most notably avoid system headers)
   include-directives:
     - '**bindings.h'
+ffi-native:
+  assetId: package:meesign_native/libmeesign_crypto

meesign_native/hook/build.dart

@@ -0,0 +1,80 @@
+import 'dart:io';
+
+import 'package:native_assets_cli/native_assets_cli.dart';
+
+String selectTarget(OS os, Architecture architecture) {
+  return switch ((os, architecture)) {
+    (OS.linux, Architecture.x64) => 'x86_64-unknown-linux-gnu',
+    (OS.windows, Architecture.x64) => 'x86_64-pc-windows-msvc',
+    (OS.macOS, Architecture.x64) => 'x86_64-apple-darwin',
+    (OS.macOS, Architecture.arm64) => 'aarch64-apple-darwin',
+    (OS.android, Architecture.x64) => 'x86_64-linux-android',
+    (OS.android, Architecture.arm64) => 'aarch64-linux-android',
+    (OS.iOS, Architecture.arm64) => 'aarch64-apple-ios',
+    _ => throw UnsupportedError('($os, $architecture) not supported'),
+  };
+}
+
+String libPrefix(OS os) => switch (os) {
+      OS.linux || OS.macOS || OS.android || OS.iOS => 'lib',
+      _ => '',
+    };
+
+String libSuffix(OS os) => switch (os) {
+      OS.linux || OS.android => '.so',
+      OS.macOS || OS.iOS => '.dylib',
+      OS.windows => '.dll',
+      _ => throw UnsupportedError(''),
+    };
+
+void main(List<String> args) async {
+  await build(args, (config, output) async {
+    if (config.linkModePreference == LinkModePreference.static) {
+      // Simulate that this hook only supports dynamic libraries.
+      throw UnsupportedError(
+        'LinkModePreference.static is not supported.',
+      );
+    }
+
+    final target = selectTarget(
+      config.targetOS,
+      config.targetArchitecture ?? Architecture.current,
+    );
+    String libName =
+        '${libPrefix(config.targetOS)}meesign_crypto${libSuffix(config.targetOS)}';
+    final assetPath = config.outputDirectory.resolve(libName);
+    final cryptoDir = config.packageRoot.resolve('native/meesign-crypto/');
+
+    if (!config.dryRun) {
+      final result = await Process.run(
+        'cargo',
+        ['build', '--release', '--target', target],
+        workingDirectory: cryptoDir.toFilePath(),
+        includeParentEnvironment: true,
+        runInShell: true,
+      );
+      stdout.write(result.stdout);
+      stderr.write(result.stderr);
+
+      final libUri = cryptoDir.resolve('target/$target/release/$libName');
+      await File.fromUri(libUri).copy(assetPath.toFilePath());
+
+      output.addDependencies([
+        cryptoDir,
+        config.packageRoot.resolve('hook/build.dart'),
+      ]);
+    }
+
+    output.addAsset(
+      // TODO: Change to DataAsset once the Dart/Flutter SDK can consume it.
+      NativeCodeAsset(
+        package: config.packageName,
+        name: 'libmeesign_crypto',
+        file: assetPath,
+        linkMode: DynamicLoadingBundled(),
+        os: config.targetOS,
+        architecture: config.targetArchitecture,
+      ),
+    );
+  });
+}