feat: experimental native hooks

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "dobby"]
+	path = native/jni/external/dobby
+	url = https://github.com/jmpews/Dobby

core/build.gradle.kts

@@ -42,4 +42,5 @@ dependencies {
     implementation(libs.androidx.documentfile)
 
     implementation(project(":mapper"))
+    implementation(project(":native"))
 }

core/src/main/assets/lang/en_US.json

@@ -249,6 +249,10 @@
                         "name": "Disable Metrics",
                         "description": "Disables some analytics data sent to Snapchat"
                     },
+                    "disable_bitmoji": {
+                        "name": "Disable Bitmoji",
+                        "description": "Disables friends profile bitmoji for the whole app"
+                    },
                     "block_ads": {
                         "name": "Block Ads",
                         "description": "Prevent ads from being displayed"

core/src/main/kotlin/me/rhunk/snapenhance/ModContext.kt

@@ -21,6 +21,8 @@ import me.rhunk.snapenhance.database.DatabaseAccess
 import me.rhunk.snapenhance.features.Feature
 import me.rhunk.snapenhance.manager.impl.ActionManager
 import me.rhunk.snapenhance.manager.impl.FeatureManager
+import me.rhunk.snapenhance.nativelib.NativeConfig
+import me.rhunk.snapenhance.nativelib.NativeLib
 import me.rhunk.snapenhance.util.download.HttpServer
 import java.util.concurrent.ExecutorService
 import java.util.concurrent.Executors
@@ -44,6 +46,7 @@ class ModContext {
     val config by modConfig
     val event = EventBus(this)
     val eventDispatcher = EventDispatcher(this)
+    val native = NativeLib()
 
     val translation = LocaleWrapper()
     val features = FeatureManager(this)
@@ -121,6 +124,16 @@ class ModContext {
 
     fun reloadConfig() {
         modConfig.loadFromBridge(bridgeClient)
+        runCatching {
+            native.loadConfig(
+                NativeConfig(
+                    disableBitmoji = config.global.disableBitmoji.get(),
+                    disableMetrics = config.global.disableMetrics.get()
+                )
+            )
+        }.onFailure {
+            Logger.xposedLog("Failed to load native config", it)
+        }
     }
 
     fun getConfigLocale(): String {

core/src/main/kotlin/me/rhunk/snapenhance/SnapEnhance.kt

@@ -97,6 +97,12 @@ class SnapEnhance {
     private suspend fun init() {
         measureTime {
             with(appContext) {
+                runCatching {
+                    native.init()
+                }.onFailure {
+                    Logger.xposedLog("Failed to init native", it)
+                    return
+                }
                 reloadConfig()
                 withContext(appContext.coroutineDispatcher) {
                     translation.userLocale = getConfigLocale()

core/src/main/kotlin/me/rhunk/snapenhance/core/config/impl/Global.kt

@@ -8,6 +8,7 @@ class Global : ConfigContainer() {
     val snapchatPlus = boolean("snapchat_plus") { addNotices(FeatureNotice.MAY_BAN) }
     val autoUpdater = unique("auto_updater", "EVERY_LAUNCH", "DAILY", "WEEKLY").apply { set("DAILY") }
     val disableMetrics = boolean("disable_metrics")
+    val disableBitmoji = boolean("disable_bitmoji") { addNotices(FeatureNotice.UNSTABLE) }
     val blockAds = boolean("block_ads")
     val disableVideoLengthRestrictions = boolean("disable_video_length_restrictions") { addNotices(FeatureNotice.MAY_BAN) }
     val disableGooglePlayDialogs = boolean("disable_google_play_dialogs")

core/src/main/kotlin/me/rhunk/snapenhance/core/eventbus/EventBus.kt

@@ -56,7 +56,7 @@ class EventBus(
 
         event.context = context
 
-        subscribers[event::class]?.forEach { listener ->
+        subscribers[event::class]?.toTypedArray()?.forEach { listener ->
             @Suppress("UNCHECKED_CAST")
             runCatching {
                 (listener as IListener<T>).handle(event)

native/.gitignore

@@ -0,0 +1 @@
+/build

native/build.gradle.kts

@@ -0,0 +1,28 @@
+@Suppress("DSL_SCOPE_VIOLATION") // TODO: Remove once KTIJ-19369 is fixed
+plugins {
+    alias(libs.plugins.androidLibrary)
+    alias(libs.plugins.kotlinAndroid)
+}
+
+android {
+    namespace = "me.rhunk.snapenhance.nativelib"
+    compileSdk = 34
+
+    defaultConfig {
+        externalNativeBuild {
+            cmake {
+                cppFlags("")
+            }
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            path("jni/CMakeLists.txt")
+            version = "3.22.1"
+        }
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}

native/jni/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.22.1)
+
+project("nativelib")
+
+set(DOBBY_GENERATE_SHARED OFF)
+add_subdirectory(external/dobby)
+
+add_library(${CMAKE_PROJECT_NAME} SHARED
+        src/library.cpp
+    )
+
+target_link_libraries(${CMAKE_PROJECT_NAME}
+        android
+        log
+        dobby_static
+        )

native/jni/external/dobby

@@ -0,0 +1 @@
+Subproject commit b0176de574104726bb68dff3b77ee666300fc338

native/jni/src/config.h

@@ -0,0 +1,6 @@
+#pragma once
+
+typedef struct {
+    bool disable_bitmoji;
+    bool disable_metrics;
+} native_config_t;

native/jni/src/library.cpp

@@ -0,0 +1,76 @@
+#include <jni.h>
+#include <string>
+#include <dobby.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fstream>
+#include <vector>
+
+#include "logger.h"
+#include "config.h"
+
+static native_config_t *native_config;
+
+static auto fstat_original = fstat;
+static int fstat_hook(int fd, struct stat *buf) {
+    char name[256];
+    memset(name, 0, 256);
+    snprintf(name, sizeof(name), "/proc/self/fd/%d", fd);
+    readlink(name, name, sizeof(name));
+
+    auto fileName = std::string(name);
+
+    //prevent blizzardv2 metrics
+    if (native_config->disable_metrics && fileName.find("files/blizzardv2/queues") != std::string::npos) {
+        unlink(name);
+        return -1;
+    }
+
+    //prevent bitmoji to load
+    if (native_config->disable_bitmoji && fileName.find("com.snap.file_manager_4_SCContent") != std::string::npos) {
+        return -1;
+    }
+
+    return fstat_original(fd, buf);
+}
+
+
+#define GET_BOOL_FIELD(env, clazz, field) env->GetBooleanField(clazz, env->GetFieldID(clazz, field, "Z"))
+
+extern "C" JNIEXPORT void JNICALL
+loadConfig(JNIEnv *env, jobject  clazz, jobject config_object) {
+    auto native_config_class = env->GetObjectClass(config_object);
+
+    native_config->disable_bitmoji = GET_BOOL_FIELD(env, native_config_class, "disableBitmoji");
+    native_config->disable_metrics = GET_BOOL_FIELD(env, native_config_class, "disableMetrics");
+
+    LOGD("config loaded");
+}
+
+//jni onload
+extern "C" JNIEXPORT jint JNICALL
+JNI_OnLoad(JavaVM *vm, void *reserved) {
+    LOGD("initializing native");
+    // config
+    native_config = new native_config_t;
+
+    // hooks
+    DobbyHook((void *) fstat_original,(void *) fstat_hook,(void **) &fstat_original);
+
+    // register native methods
+    JNIEnv *env = nullptr;
+    vm->GetEnv((void **) &env, JNI_VERSION_1_6);
+
+    auto methods = std::vector<JNINativeMethod>();
+    methods.push_back({"loadConfig", "(Lme/rhunk/snapenhance/nativelib/NativeConfig;)V", (void *) loadConfig});
+
+    env->RegisterNatives(
+            env->FindClass("me/rhunk/snapenhance/nativelib/NativeLib"),
+            methods.data(),
+            methods.size()
+    );
+
+    LOGD("native initialized");
+
+    return JNI_VERSION_1_6;
+}

native/jni/src/logger.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <android/log.h>
+
+#define LOG_TAG "SnapEnhanceNative"
+
+#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)
+#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,  LOG_TAG, __VA_ARGS__)
+#define LOGW(...) __android_log_print(ANDROID_LOG_WARN,  LOG_TAG, __VA_ARGS__)
+

native/src/main/kotlin/me/rhunk/snapenhance/nativelib/NativeConfig.kt

@@ -0,0 +1,6 @@
+package me.rhunk.snapenhance.nativelib
+
+data class NativeConfig(
+    val disableBitmoji: Boolean = false,
+    val disableMetrics: Boolean = false
+)

native/src/main/kotlin/me/rhunk/snapenhance/nativelib/NativeLib.kt

@@ -0,0 +1,10 @@
+package me.rhunk.snapenhance.nativelib
+
+class NativeLib {
+    fun init() {
+        System.loadLibrary("nativelib")
+    }
+
+
+    external fun loadConfig(config: NativeConfig)
+}

settings.gradle.kts

@@ -20,3 +20,4 @@ rootProject.name = "SnapEnhance"
 include(":core")
 include(":app")
 include(":mapper")
+include(":native")