[Build]: Configure JNI build for use in Java on Linux/MacOS

.github/workflows/kotlin-ci.yml

@@ -55,5 +55,14 @@ jobs:
         source emsdk/emsdk_env.sh
         tools/generate-files
 
+    - name: CMake (Java, Kotlin)
+      run: |
+        cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=Debug -DTW_UNITY_BUILD=ON -DTW_COMPILE_JAVA=ON -DTW_COMPILE_KOTLIN=ON -GNinja
+
+    # The build artifact will be used in `tools/kotlin-build` in the future.
+    - name: Build JNI
+      run: |
+        ninja -Cbuild
+
     - name: Build Kotlin Multiplatform
       run: tools/kotlin-build

CMakeLists.txt

@@ -50,7 +50,7 @@ include(cmake/Protobuf.cmake)
 
 # Source files
 if (${ANDROID})
-    message("Configuring for JNI")
+    message("Configuring for Android JNI")
     file(GLOB_RECURSE core_sources src/*.c src/*.cc src/*.cpp src/*.h jni/cpp/*.cpp jni/cpp/*.h)
     if (${KOTLIN})
         file(GLOB_RECURSE specific_sources
@@ -75,6 +75,24 @@ if (${ANDROID})
         set(WALLET_CORE_BINDGEN ${WALLET_CORE_RS_TARGET_DIR}/x86_64-linux-android/release/${WALLET_CORE_RS_LIB})
     endif ()
     target_link_libraries(TrustWalletCore PUBLIC ${WALLET_CORE_BINDGEN} ${PROJECT_NAME}_INTERFACE PRIVATE TrezorCrypto protobuf ${log-lib} Boost::boost)
+elseif (${TW_COMPILE_JAVA})
+    message("Configuring for JNI")
+    file(GLOB_RECURSE core_sources src/*.c src/*.cc src/*.cpp src/*.h jni/cpp/*.cpp jni/cpp/*.h)
+    if (${TW_COMPILE_KOTLIN})
+        file(GLOB_RECURSE specific_sources
+                jni/kotlin/*.h
+                jni/kotlin/*.c
+                kotlin/wallet-core-kotlin/src/commonAndroidJvmMain/cpp/generated/*.h
+                kotlin/wallet-core-kotlin/src/commonAndroidJvmMain/cpp/generated/*.c
+                )
+    else ()
+        file(GLOB_RECURSE specific_sources jni/android/*.h jni/android/*.c)
+    endif ()
+    set(sources ${core_sources} ${specific_sources})
+    add_library(TrustWalletCore SHARED ${sources} ${PROTO_SRCS} ${PROTO_HDRS})
+    find_package(JNI REQUIRED)
+    target_include_directories(TrustWalletCore PRIVATE ${JNI_INCLUDE_DIRS})
+    target_link_libraries(TrustWalletCore PUBLIC ${WALLET_CORE_BINDGEN} ${PROJECT_NAME}_INTERFACE PRIVATE TrezorCrypto protobuf Boost::boost)
 else ()
     message("Configuring standalone")
     file(GLOB_RECURSE sources src/*.c src/*.cc src/*.cpp src/*.h)

cmake/StandardSettings.cmake

@@ -66,7 +66,7 @@ endif ()
 option(TW_UNIT_TESTS "Enable the unit tests of the project" ON)
 option(TW_BUILD_EXAMPLES "Enable the examples builds of the project" ON)
 
-if (ANDROID OR IOS_PLATFORM OR TW_COMPILE_WASM)
+if (ANDROID OR IOS_PLATFORM OR TW_COMPILE_WASM OR TW_COMPILE_JAVA)
     set(TW_UNIT_TESTS OFF)
     set(TW_BUILD_EXAMPLES OFF)
 endif()

jni/cpp/Random.cpp

@@ -6,6 +6,7 @@
 
 #include <jni.h>
 #include <string.h>
+#include <stdint.h>
 
 static JavaVM* cachedJVM;
 
@@ -27,7 +28,12 @@ uint32_t random32() {
 
 void random_buffer(uint8_t *buf, size_t len) {
     JNIEnv *env;
+
+#if defined(__ANDROID__) || defined(ANDROID)
     cachedJVM->AttachCurrentThread(&env, nullptr);
+#else
+    cachedJVM->AttachCurrentThread((void **) &env, nullptr);
+#endif
 
     // SecureRandom random = new SecureRandom();
     jclass secureRandomClass = env->FindClass("java/security/SecureRandom");

trezor-crypto/CMakeLists.txt

@@ -65,7 +65,7 @@ if (EMSCRIPTEN)
     message(STATUS "Skip building trezor-crypto/tests")
     set(TW_WARNING_FLAGS ${TW_WARNING_FLAGS} -Wno-bitwise-instead-of-logical)
 else ()
-    if(NOT ANDROID AND NOT IOS_PLATFORM)
+    if(NOT ANDROID AND NOT IOS_PLATFORM AND NOT TW_COMPILE_JAVA)
         add_subdirectory(crypto/tests)
     endif()
 endif()