Build SDK bindings for Flutter (#488)

* Add build SDK bindings scripts for flutter

* Remove REMOVE_RECURSE to prevent bindings deletion

* Address feedback

.github/workflows/publish-flutter.yml

@@ -60,7 +60,9 @@ jobs:
           rm -rf lib
           cp -r ../build/packages/flutter/android .
           cp -r ../build/packages/flutter/ios .
+          mv android/build.gradle.production android/build.gradle
           mv ios/flutter_breez_liquid.podspec.production ios/flutter_breez_liquid.podspec
+          rm ios/breez_sdk_liquid.podspec
           cp -r ../build/packages/flutter/lib .
           cp -r ../build/lib/bindings/langs/flutter/breez_sdk_liquid/include/breez_sdk_liquid.h ios/Classes
           cp ../build/packages/flutter/analysis_options.yaml .

lib/bindings/langs/flutter/justfile

@@ -16,6 +16,7 @@ bootstrap frb='true' build='false':
 	@if {{build}} == true; then just build; fi
 	@if {{build}} == true; then melos build; fi
 	@if {{build}} == true; then just link; fi
+	@if {{build}} == true; then just build-uniffi; fi	
 	just check
 
 # Install flutter_rust_bridge_codegen dependencies
@@ -54,6 +55,16 @@ build-android profile='frb-min':
 build-other profile='frb-min':
 	dart scripts/build_other.dart --profile {{profile}}
 
+build-uniffi:
+	just build-uniffi-android
+	just build-uniffi-swift
+
+build-uniffi-android:
+	bash scripts/build_uniffi_android.sh
+
+build-uniffi-swift:
+	bash scripts/build_uniffi_swift.sh
+
 # (melos) Run tests on packages in workspace
 test build='false':
 	just test-dart {{build}}

lib/bindings/langs/flutter/scripts/build_uniffi_android.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+cd ../..
+make android
+rm -r ../../packages/flutter/android/src/main/kotlin
+mkdir -p ../../packages/flutter/android/src/main/jniLibs/arm64-v8a
+mkdir -p ../../packages/flutter/android/src/main/jniLibs/armeabi-v7a
+mkdir -p ../../packages/flutter/android/src/main/jniLibs/x86
+mkdir -p ../../packages/flutter/android/src/main/jniLibs/x86_64
+cp ffi/kotlin/jniLibs/arm64-v8a/*.so ../../packages/flutter/android/src/main/jniLibs/arm64-v8a/
+cp ffi/kotlin/jniLibs/armeabi-v7a/*.so ../../packages/flutter/android/src/main/jniLibs/armeabi-v7a/
+cp ffi/kotlin/jniLibs/x86/*.so ../../packages/flutter/android/src/main/jniLibs/x86/
+cp ffi/kotlin/jniLibs/x86_64/*.so ../../packages/flutter/android/src/main/jniLibs/x86_64/
+cp -r langs/android/lib/src/main/kotlin ../../packages/flutter/android/src/main/
+cp -r ffi/kotlin/breez_sdk_liquid ../../packages/flutter/android/src/main/kotlin

lib/bindings/langs/flutter/scripts/build_uniffi_swift.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+cd ../..
+make bindings-swift
+rm -rf ../../packages/flutter/ios/bindings-swift
+cp -r langs/swift ../../packages/flutter/ios/bindings-swift
+rm -f ../../packages/flutter/ios/bindings-swift/Package.swift

lib/bindings/langs/flutter/scripts/version.sh

@@ -5,6 +5,7 @@ TAG_NAME=`awk '/^version: /{print $2}' $ROOT/packages/flutter/pubspec.yaml`
 
 # iOS & macOS
 APPLE_HEADER="version = '$TAG_NAME' # generated; do not edit"
+sed -i.bak "1 s/.*/$APPLE_HEADER/" $ROOT/packages/flutter/ios/breez_sdk_liquid.podspec
 sed -i.bak "1 s/.*/$APPLE_HEADER/" $ROOT/packages/flutter/ios/flutter_breez_liquid.podspec
 sed -i.bak "1 s/.*/$APPLE_HEADER/" $ROOT/packages/flutter/ios/flutter_breez_liquid.podspec.production
 sed -i.bak "1 s/.*/$APPLE_HEADER/" $ROOT/packages/flutter/macos/flutter_breez_liquid.podspec
@@ -18,4 +19,9 @@ do
     rm $ROOT/packages/flutter/$CMAKE_PLATFORM/*.bak
 done
 
+GRADLE_HEADER="version '$TAG_NAME' \/\/ generated; do not edit"
+sed -i.bak "1 s/.*/$GRADLE_HEADER/" $ROOT/packages/flutter/android/build.gradle
+sed -i.bak "1 s/.*/$GRADLE_HEADER/" $ROOT/packages/flutter/android/build.gradle.production
+rm $ROOT/packages/flutter/android/*.bak
+
 git add $ROOT/packages/flutter/

packages/flutter/.gitignore

@@ -27,4 +27,4 @@ migrate_working_dir/
 **/doc/api/
 .dart_tool/
 .packages
-build/
+build/

packages/flutter/android/.gitignore

@@ -10,5 +10,6 @@
 
 # Ignore Rust binaries
 src/main/jniLibs/
+src/main/kotlin/
 *.tar.gz
 

packages/flutter/android/CMakeLists.txt

@@ -23,7 +23,6 @@ if(NOT EXISTS ${ArchivePath})
 endif()
 
 # Extract the binaries, overriding any already present.
-file(REMOVE_RECURSE ${LibRoot})
 file(MAKE_DIRECTORY ${LibRoot})
 execute_process(
   COMMAND ${CMAKE_COMMAND} -E tar xzf ${ArchivePath}

packages/flutter/android/build.gradle

@@ -1,9 +1,8 @@
-// The Android Gradle Plugin builds the native code with the Android NDK.
-
+version '0.2.1' // generated; do not edit
 group 'com.example.flutter_breez_liquid'
-version '0.2.1'
 
 buildscript {
+    ext.kotlin_version = '1.8.20'
     repositories {
         google()
         mavenCentral()
@@ -12,6 +11,7 @@ buildscript {
     dependencies {
         // The Android Gradle Plugin knows how to build native code with the NDK.
         classpath 'com.android.tools.build:gradle:7.1.2'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 
@@ -23,11 +23,13 @@ rootProject.allprojects {
 }
 
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlinx-serialization'
 
 android {
     // Bumping the plugin compileSdkVersion requires all clients of this plugin
     // to bump the version in their app.
-    compileSdkVersion 31
+    compileSdkVersion 34
 
     // Bumping the plugin ndkVersion requires all clients of this plugin to bump
     // the version in their app and to download a newer version of the NDK.
@@ -52,8 +54,22 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+    
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
 
     defaultConfig {
-        minSdkVersion 16
+        minSdkVersion 24
     }
 }
+
+dependencies {
+    implementation "net.java.dev.jna:jna:5.14.0@aar"
+    /* JSON serialization */
+    implementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.3'
+}

packages/flutter/android/build.gradle.production

@@ -0,0 +1,57 @@
+version '0.2.1' // generated; do not edit
+group 'com.example.flutter_breez_liquid'
+
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        // The Android Gradle Plugin knows how to build native code with the NDK.
+        classpath 'com.android.tools.build:gradle:7.1.2'
+    }
+}
+
+rootProject.allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+apply plugin: 'com.android.library'
+
+android {
+    // Bumping the plugin compileSdkVersion requires all clients of this plugin
+    // to bump the version in their app.
+    compileSdkVersion 34
+
+    // Bumping the plugin ndkVersion requires all clients of this plugin to bump
+    // the version in their app and to download a newer version of the NDK.
+    ndkVersion "21.1.6352462"
+
+    // Invoke the shared CMake build with the Android Gradle Plugin.
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+
+            // The default CMake version for the Android Gradle Plugin is 3.10.2.
+            // https://developer.android.com/studio/projects/install-ndk#vanilla_cmake
+            //
+            // The Flutter tooling requires that developers have CMake 3.10 or later
+            // installed. You should not increase this version, as doing so will cause
+            // the plugin to fail to compile for some customers of the plugin.
+            // version "3.10.2"
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    defaultConfig {
+        minSdkVersion 24
+    }
+}

packages/flutter/ios/.gitignore

@@ -1,4 +1,5 @@
 Flutter/
 Runner/
 Frameworks/*
-!Frameworks/.gitkeep
+!Frameworks/.gitkeep
+bindings-swift

packages/flutter/ios/breez_sdk_liquid.podspec

@@ -0,0 +1,25 @@
+version = '0.2.1' # generated; do not edit
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint breez_sdk.podspec` to validate before publishing.
+Pod::Spec.new do |s|
+  s.name                   = 'BreezSDKLiquid'
+  s.version                = "#{version}"
+  s.license                = { :type => "MIT" }
+  s.summary                = "Swift bindings to the Breez Liquid SDK"
+  s.homepage               = "https://breez.technology"
+  s.authors                = { "Breez" => "contact@breez.technology" }
+  s.documentation_url      = "https://sdk-doc.breez.technology"
+  s.ios.deployment_target  = "13.0"
+  s.source                 = { :path => '.' }
+  s.source_files           = [
+    'bindings-swift/Sources/BreezSDKLiquid/*.swift', 
+    'bindings-swift/Sources/BreezSDKLiquid/**/*.swift'
+  ]
+  s.platform               = :ios, '13.0'
+  s.static_framework       = true
+  s.vendored_frameworks    = "bindings-swift/breez_sdk_liquidFFI.xcframework"
+
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig    = {'STRIP_STYLE' => 'non-global', 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
+  s.swift_version          = '5.0'
+end