[Main] Implement downloading bundle using ktor

.idea/deploymentTargetDropDown.xml

@@ -12,6 +12,6 @@
         </deviceKey>
       </Target>
     </runningDeviceTargetSelectedWithDropDown>
-    <timeTargetWasSelectedWithDropDown value="2023-05-05T19:41:23.828568900Z" />
+    <timeTargetWasSelectedWithDropDown value="2023-05-08T22:05:30.827281100Z" />
   </component>
 </project>

.idea/gradle.xml

@@ -4,8 +4,10 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="jbr-17" />
+        <option name="gradleJvm" value="#JAVA_HOME" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />

.idea/jarRepositories.xml

@@ -21,5 +21,10 @@
       <option name="name" value="Google" />
       <option name="url" value="https://dl.google.com/dl/android/maven2/" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenRepo" />
+      <option name="name" value="MavenRepo" />
+      <option name="url" value="https://repo.maven.apache.org/maven2/" />
+    </remote-repository>
   </component>
 </project>

.idea/misc.xml

@@ -1,6 +1,6 @@
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="temurin-17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/build.gradle.kts

@@ -38,4 +38,6 @@ android {
 dependencies {
     compileOnly("de.robv.android.xposed:api:82")
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.0")
+    implementation("io.ktor:ktor-client-core:2.3.0")
+    implementation("io.ktor:ktor-client-cio:2.3.0")
 }

app/src/main/kotlin/dev/beefers/vendetta/xposed/Main.kt

@@ -1,5 +1,11 @@
 package dev.beefers.vendetta.xposed
 
+// Java
+import java.io.File
+
+// Kotlin
+import kotlinx.coroutines.runBlocking
+
 // Android
 import android.content.res.AssetManager
 import android.content.res.XModuleResources
@@ -12,6 +18,19 @@ import de.robv.android.xposed.XC_MethodHook
 import de.robv.android.xposed.XposedBridge
 import de.robv.android.xposed.callbacks.XC_LoadPackage
 
+// Ktor
+import io.ktor.client.*
+import io.ktor.client.call.body
+import io.ktor.client.engine.cio.*
+import io.ktor.client.request.*
+import io.ktor.client.statement.*
+import io.ktor.client.plugins.*
+import io.ktor.http.HttpHeaders
+import io.ktor.http.HttpStatusCode
+import io.ktor.http.isSuccess
+import io.ktor.utils.io.reader
+import java.lang.Exception
+
 class Main : IXposedHookZygoteInit, IXposedHookLoadPackage {
     private lateinit var resources: XModuleResources
 
@@ -28,16 +47,31 @@ class Main : IXposedHookZygoteInit, IXposedHookLoadPackage {
         val loadScriptFromAssets = catalystInstance.getDeclaredMethod("jniLoadScriptFromAssets", AssetManager::class.java, String::class.java, Boolean::class.javaPrimitiveType)
         val loadScriptFromFile = catalystInstance.getDeclaredMethod("jniLoadScriptFromFile", String::class.java, String::class.java, Boolean::class.javaPrimitiveType)
 
-        // TODO: bundle (down)loading with etag
-        // val cache = File(appInfo.dataDir, "cache").also { it.mkdirs() }
-        // val bundle = File(cache, "vendetta.js")
+         val cache = File(appInfo.dataDir, "cache").also { it.mkdirs() }
+         val bundle = File(cache, "vendetta.js")
+         val etag = File(cache, "vendetta_etag.txt")
 
         // TODO: loader config
+        // TODO: make fast.
 
         val hook = object : XC_MethodHook() {
-            override fun beforeHookedMethod(param: MethodHookParam) {
+            override fun beforeHookedMethod(param: MethodHookParam): Unit = runBlocking {
                 Log.i("Vendetta", "beforeHookedMethod called")
 
+                try {
+                    val client = HttpClient(CIO) { install(HttpTimeout) { requestTimeoutMillis = 3000 } }
+                    val response: HttpResponse = client.get("https://raw.githubusercontent.com/vendetta-mod/builds/master/vendetta.js") {
+                        headers { if (etag.exists() && bundle.exists()) append(HttpHeaders.IfNoneMatch, etag.readText()) }
+                    }
+
+                    if (response.status.isSuccess()) {
+                        bundle.writeText(response.bodyAsText())
+                        if (response.headers.contains("Etag")) etag.writeText(response.headers["Etag"] as String)
+                    }
+                } catch (e: Exception) {
+                    Log.e("Vendetta", "Failed to download Vendetta")
+                }
+
                 Log.i("Vendetta", "Exfiltrating Metro modules")
                 XposedBridge.invokeOriginalMethod(loadScriptFromAssets,param.thisObject, arrayOf(resources.assets, "assets://js/modules.js", true))
                 Log.i("Vendetta", "Executing identity snippet")
@@ -46,6 +80,11 @@ class Main : IXposedHookZygoteInit, IXposedHookLoadPackage {
 
             override fun afterHookedMethod(param: MethodHookParam) {
                 Log.i("Vendetta", "afterHookedMethod called")
+
+                try {
+                    Log.i("Vendetta", "Executing Vendetta")
+                    XposedBridge.invokeOriginalMethod(loadScriptFromFile, param.thisObject, arrayOf(bundle.absolutePath, bundle.absolutePath, param.args[2]))
+                } catch(_: Exception) {}
             }
         }
 

build.gradle.kts

@@ -2,6 +2,8 @@
 buildscript {
     repositories {
         google()
+        mavenCentral()
+        // We need jcenter for the Xposed API...
         jcenter()
     }
     dependencies {
@@ -16,6 +18,8 @@ buildscript {
 allprojects {
     repositories {
         google()
+        mavenCentral()
+        // See comment in buildscript repos
         jcenter()
     }
 }