feat: Native authentication package

Bindings to native APIs for authentication via ASWebAuthenticationSession and Custom Tabs

.github/workflows/native_auth_flutter.yaml

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+name: native_auth_flutter
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/native_auth_flutter.yaml"
+      - "packages/native/auth/native_auth_flutter/**"
+
+# Prevent duplicate runs due to Graphite
+# https://graphite.dev/docs/troubleshooting#why-are-my-actions-running-twice
+concurrency:
+  group: ${{ github.repository }}-${{ github.workflow }}-${{ github.ref }}-${{ github.ref == 'refs/heads/main' && github.sha || ''}}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    working-directory: packages/native/auth/native_auth_flutter
+
+jobs:
+  build:
+    runs-on: macos-latest-xlarge
+    timeout-minutes: 25
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # 4.1.6
+      - name: Setup Flutter
+        uses: subosito/flutter-action@44ac965b96f18d999802d4b807e3256d5a3f9fa1 # 2.16.0
+        with:
+          channel: stable
+          cache: true
+      - name: Get Packages
+        run: flutter pub get
+      - name: Analyze
+        run: dart analyze --fatal-infos --fatal-warnings
+      - name: Format
+        run: dart format --set-exit-if-changed .
+      # - name: Test
+      #   run: dart test
+      # - name: Test (Example)
+      #   run: dart test
+      - name: Build Example (iOS)
+        run: flutter build ios --no-codesign
+        working-directory: packages/native/auth/native_auth_flutter/example
+      - name: Build Example (Web)
+        run: flutter build web
+        working-directory: packages/native/auth/native_auth_flutter/example

packages/native/auth/native_auth_flutter/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+# Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
+/pubspec.lock
+**/doc/api/
+.dart_tool/
+build/

packages/native/auth/native_auth_flutter/.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819"
+  channel: "stable"
+
+project_type: plugin_ffi
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819
+      base_revision: 80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819
+    - platform: android
+      create_revision: 80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819
+      base_revision: 80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819
+    - platform: ios
+      create_revision: 80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819
+      base_revision: 80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819
+    - platform: macos
+      create_revision: 80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819
+      base_revision: 80c2e84975bbd28ecf5f8d4bd4ca5a2490bfc819
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

packages/native/auth/native_auth_flutter/CHANGELOG.md

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+## 0.1.0
+
+- Initial release

packages/native/auth/native_auth_flutter/LICENSE

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+TODO: Add your license here.

packages/native/auth/native_auth_flutter/README.md

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+# native_auth_flutter
+
+A new Flutter FFI plugin project.
+
+## Getting Started
+
+This project is a starting point for a Flutter
+[FFI plugin](https://flutter.dev/to/ffi-package),
+a specialized package that includes native code directly invoked with Dart FFI.
+
+## Project structure
+
+This template uses the following structure:
+
+* `src`: Contains the native source code, and a CmakeFile.txt file for building
+  that source code into a dynamic library.
+
+* `lib`: Contains the Dart code that defines the API of the plugin, and which
+  calls into the native code using `dart:ffi`.
+
+* platform folders (`android`, `ios`, `windows`, etc.): Contains the build files
+  for building and bundling the native code library with the platform application.
+
+## Building and bundling native code
+
+The `pubspec.yaml` specifies FFI plugins as follows:
+
+```yaml
+  plugin:
+    platforms:
+      some_platform:
+        ffiPlugin: true
+```
+
+This configuration invokes the native build for the various target platforms
+and bundles the binaries in Flutter applications using these FFI plugins.
+
+This can be combined with dartPluginClass, such as when FFI is used for the
+implementation of one platform in a federated plugin:
+
+```yaml
+  plugin:
+    implements: some_other_plugin
+    platforms:
+      some_platform:
+        dartPluginClass: SomeClass
+        ffiPlugin: true
+```
+
+A plugin can have both FFI and method channels:
+
+```yaml
+  plugin:
+    platforms:
+      some_platform:
+        pluginClass: SomeName
+        ffiPlugin: true
+```
+
+The native build systems that are invoked by FFI (and method channel) plugins are:
+
+* For Android: Gradle, which invokes the Android NDK for native builds.
+  * See the documentation in android/build.gradle.
+* For iOS and MacOS: Xcode, via CocoaPods.
+  * See the documentation in ios/native_auth_flutter.podspec.
+  * See the documentation in macos/native_auth_flutter.podspec.
+* For Linux and Windows: CMake.
+  * See the documentation in linux/CMakeLists.txt.
+  * See the documentation in windows/CMakeLists.txt.
+
+## Binding to native code
+
+To use the native code, bindings in Dart are needed.
+To avoid writing these by hand, they are generated from the header file
+(`src/native_auth_flutter.h`) by `package:ffigen`.
+Regenerate the bindings by running `dart run ffigen --config ffigen.yaml`.
+
+## Invoking native code
+
+Very short-running native functions can be directly invoked from any isolate.
+For example, see `sum` in `lib/native_auth_flutter.dart`.
+
+Longer-running functions should be invoked on a helper isolate to avoid
+dropping frames in Flutter applications.
+For example, see `sumAsync` in `lib/native_auth_flutter.dart`.
+
+## Flutter help
+
+For help getting started with Flutter, view our
+[online documentation](https://docs.flutter.dev), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.
+

packages/native/auth/native_auth_flutter/analysis_options.yaml

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+include: package:flutter_lints/flutter.yaml
+
+analyzer:
+  exclude:
+    - '**/*.ffi.dart'

packages/native/auth/native_auth_flutter/android/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.cxx

packages/native/auth/native_auth_flutter/android/build.gradle

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+group = "dev.celest.native_auth"
+version = "1.0"
+
+buildscript {
+    // Matches package:jni
+    // https://github.com/dart-lang/native/blob/main/pkgs/jni/android/build.gradle#L7
+    ext.kotlin_version = '1.6.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath "com.android.tools.build:gradle:7.4.2"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+rootProject.allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+apply plugin: "com.android.library"
+apply plugin: 'kotlin-android'
+
+android {
+    if (project.android.hasProperty("namespace")) {
+        namespace = "dev.celest.native_auth"
+    }
+
+    compileSdk 34
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        minSdkVersion 21
+        consumerProguardFiles 'consumer-rules.pro'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+
+    testOptions {
+        unitTests {
+            includeAndroidResources = true
+        }
+    }
+}
+
+dependencies {
+    implementation "androidx.browser:browser:1.8.0"
+}

packages/native/auth/native_auth_flutter/android/consumer-rules.pro

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+-keep class dev.celest.native_auth.** { *; }
+-if class androidx.credentials.CredentialManager
+-keep class androidx.credentials.playservices.** {
+  *;
+}

packages/native/auth/native_auth_flutter/android/settings.gradle

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+rootProject.name = 'native_auth_flutter'

packages/native/auth/native_auth_flutter/android/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="dev.celest.native_auth">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application>
+        <activity
+            android:name=".NativeAuthRedirectManagerActivity"
+            android:exported="false"
+            android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen"
+            android:launchMode="singleTask" />
+        <activity
+            android:name=".NativeAuthRedirectReceiverActivity"
+            android:exported="true"
+            android:theme="@android:style/Theme.NoDisplay">
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="${nativeAuthRedirectScheme}" />
+            </intent-filter>
+        </activity>
+    </application>
+
+    <queries>
+        <intent>
+            <action android:name="android.support.customtabs.action.CustomTabsService" />
+        </intent>
+    </queries>
+</manifest>