feat: start libsession-util integration and experimentation

libsession-util/src/androidTest/java/network/loki/messenger/libsession_util/ExampleInstrumentedTest.kt

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+package network.loki.messenger.libsession_util
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("network.loki.messenger.libsession_util.test", appContext.packageName)
+    }
+
+    @Test
+    fun jni_accessible() {
+        assertEquals("Hello from C++", NativeLib().stringFromJNI())
+    }
+
+}

libsession-util/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="network.loki.messenger.libsession_util">
+
+</manifest>

libsession-util/src/main/cpp/CMakeLists.txt

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+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+
+cmake_minimum_required(VERSION 3.18.1)
+
+# Declares and names the project.
+
+project("session_util")
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+
+add_library( # Sets the name of the library.
+        session_util
+
+        # Sets the library as a shared library.
+        SHARED
+
+        # Provides a relative path to your source file(s).
+        session_util.cpp)
+
+# Searches for a specified prebuilt library and stores the path as a
+# variable. Because CMake includes system libraries in the search path by
+# default, you only need to specify the name of the public NDK library
+# you want to add. CMake verifies that the library exists before
+# completing its build.
+
+find_library( # Sets the name of the path variable.
+        log-lib
+
+        # Specifies the name of the NDK library that
+        # you want CMake to locate.
+        log)
+
+# Add the libsession-util library here
+set(distribution_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../distribution)
+add_library(external-libsession-util STATIC IMPORTED)
+set_target_properties(external-libsession-util PROPERTIES IMPORTED_LOCATION
+        ${distribution_DIR}/libsession-util-android/lib/${ANDROID_ABI}/libsession-util.a)
+
+target_include_directories(session_util PRIVATE
+        ${distribution_DIR}/libsession-util-android/include)
+
+# Specifies libraries CMake should link to your target library. You
+# can link multiple libraries, such as libraries you define in this
+# build script, prebuilt third-party libraries, or system libraries.
+
+target_link_libraries( # Specifies the target library.
+        session_util
+        external-libsession-util
+        # Links the target library to the log library
+        # included in the NDK.
+        ${log-lib})

libsession-util/src/main/cpp/session_util.cpp

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+#include <jni.h>
+#include <string>
+#include "session/config/user_profile.hpp"
+
+extern "C" JNIEXPORT jobject JNICALL
+Java_network_loki_messenger_libsession_1util_Config_00024Companion_newInstance(
+        JNIEnv* env,
+        jobject /*this*/) {
+
+    auto* profile = new session::config::UserProfile();
+
+    jclass configClass = env->FindClass("network/loki/messenger/libsession_util/Config");
+    jobject newConfig = env->AllocObject(configClass);
+
+    jfieldID pointerField = env->GetFieldID(configClass, "pointer", "J");
+    env->SetLongField(newConfig, pointerField, reinterpret_cast<jlong>(profile));
+
+    return newConfig;
+}

libsession-util/src/main/java/network/loki/messenger/libsession_util/Config.kt

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+package network.loki.messenger.libsession_util
+
+data class Config(private val /* yucky */ pointer: Long) {
+
+    companion object {
+        external fun newInstance(): Config
+    }
+
+    var lastError: String? = null
+
+
+
+}

libsession-util/src/main/java/network/loki/messenger/libsession_util/NativeLib.kt

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+package network.loki.messenger.libsession_util
+
+class NativeLib {
+
+    /**
+     * A native method that is implemented by the 'libsession_util' native library,
+     * which is packaged with this application.
+     */
+    external fun stringFromJNI(): String
+
+    companion object {
+        // Used to load the 'libsession_util' library on application startup.
+        init {
+            System.loadLibrary("session_util")
+        }
+    }
+}

libsession-util/src/test/java/network/loki/messenger/libsession_util/ExampleUnitTest.kt

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+package network.loki.messenger.libsession_util
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+
+}