Make stub patching 100% offline

app/src/main/java/com/topjohnwu/magisk/core/download/DownloadService.kt

@@ -31,6 +31,7 @@ import java.io.IOException
 import java.io.InputStream
 import java.io.OutputStream
 import java.util.zip.ZipEntry
+import java.util.zip.ZipFile
 import java.util.zip.ZipInputStream
 import java.util.zip.ZipOutputStream
 
@@ -44,14 +45,12 @@ class DownloadService : NotificationService() {
     }
 
     override fun onDestroy() {
-        super.onDestroy()
         job.cancel()
     }
 
     private fun download(subject: Subject) {
         notifyUpdate(subject.notifyId)
-        val coroutineScope = CoroutineScope(job + Dispatchers.IO)
-        coroutineScope.launch {
+        CoroutineScope(job + Dispatchers.IO).launch {
             try {
                 val stream = service.fetchFile(subject.url).toProgressStream(subject)
                 when (subject) {
@@ -75,7 +74,7 @@ class DownloadService : NotificationService() {
         }
     }
 
-    private suspend fun handleApp(stream: InputStream, subject: Subject.App) {
+    private fun handleApp(stream: InputStream, subject: Subject.App) {
         fun writeTee(output: OutputStream) {
             val uri =  MediaStoreUtils.getFile("${subject.title}.apk").uri
             val external = uri.outputStream()
@@ -96,9 +95,10 @@ class DownloadService : NotificationService() {
                             .setContentText("")
                     }
 
-                    // Download
+                    // Extract stub
                     val apk = subject.file.toFile()
-                    service.fetchFile(subject.stub.link).byteStream().writeTo(apk)
+                    val zf = ZipFile(updateApk)
+                    zf.getInputStream(zf.getEntry("assets/stub.apk")).writeTo(apk)
 
                     // Patch and install
                     val session = APKInstall.startSession(this)

app/src/main/java/com/topjohnwu/magisk/core/model/UpdateInfo.kt

@@ -22,8 +22,7 @@ data class MagiskJson(
 @Parcelize
 @JsonClass(generateAdapter = true)
 data class StubJson(
-    val versionCode: Int = -1,
-    val link: String = ""
+    val versionCode: Int = -1
 ) : Parcelable
 
 @JsonClass(generateAdapter = true)

app/src/main/java/com/topjohnwu/magisk/core/tasks/HideAPK.kt

@@ -9,9 +9,7 @@ import com.topjohnwu.magisk.R
 import com.topjohnwu.magisk.StubApk
 import com.topjohnwu.magisk.core.Config
 import com.topjohnwu.magisk.core.Const
-import com.topjohnwu.magisk.core.Info
 import com.topjohnwu.magisk.core.Provider
-import com.topjohnwu.magisk.core.di.ServiceLocator
 import com.topjohnwu.magisk.core.utils.AXML
 import com.topjohnwu.magisk.core.utils.Keygen
 import com.topjohnwu.magisk.ktx.await
@@ -40,8 +38,6 @@ object HideAPK {
     // Some arbitrary limit
     const val MAX_LABEL_LENGTH = 32
 
-    private val svc get() = ServiceLocator.networkService
-
     private fun genPackageName(): String {
         val random = SecureRandom()
         val len = 5 + random.nextInt(15)
@@ -113,17 +109,13 @@ object HideAPK {
         activity.finish()
     }
 
-    @Suppress("BlockingMethodInNonBlockingContext")
-    private suspend fun patchAndHide(activity: Activity, label: String, onFailure: Runnable): Boolean {
+    private fun patchAndHide(activity: Activity, label: String, onFailure: Runnable): Boolean {
         val stub = File(activity.cacheDir, "stub.apk")
         try {
-            svc.fetchFile(Info.remote.stub.link).byteStream().writeTo(stub)
+            activity.assets.open("stub.apk").writeTo(stub)
         } catch (e: IOException) {
             Timber.e(e)
-            stub.createNewFile()
-            val cmd = "\$MAGISKBIN/magiskinit -x manager ${stub.path}"
-            if (!Shell.cmd(cmd).exec().isSuccess)
-                return false
+            return false
         }
 
         // Generate a new random package name and signature

buildSrc/src/main/java/Setup.kt

@@ -11,6 +11,7 @@ import org.gradle.api.Action
 import org.gradle.api.JavaVersion
 import org.gradle.api.Project
 import org.gradle.api.plugins.ExtensionAware
+import org.gradle.api.tasks.Copy
 import org.gradle.api.tasks.Delete
 import org.gradle.api.tasks.StopExecutionException
 import org.gradle.api.tasks.Sync
@@ -218,13 +219,29 @@ fun Project.setupApp() {
     }
 
     android.applicationVariants.all {
-        preBuildProvider.get().dependsOn(syncResources)
+        val variantCapped = name.capitalize(Locale.ROOT)
+        val variantLowered = name.toLowerCase(Locale.ROOT)
+
+        val copyStub = tasks.register("copy${variantCapped}StubApk", Copy::class.java) {
+            dependsOn(syncResources)
+            into("src/main/assets")
+            from(rootProject.file("out/stub-${variantLowered}.apk")) {
+                rename { "stub.apk" }
+            }
+            onlyIf {
+                if (inputs.sourceFiles.files.size != 1)
+                    throw StopExecutionException("Please build stub first! (./build.py stub)")
+                true
+            }
+        }
+
+        preBuildProvider.get().dependsOn(copyStub)
 
         val keysDir = rootProject.file("tools/keys")
         val outSrcDir = File(buildDir, "generated/source/keydata/$name")
         val outSrc = File(outSrcDir, "com/topjohnwu/magisk/signing/KeyData.java")
 
-        val genSrcTask = tasks.register("generate${name.capitalize(Locale.ROOT)}KeyData") {
+        val genSrcTask = tasks.register("generate${variantCapped}KeyData") {
             inputs.dir(keysDir)
             outputs.file(outSrc)
             doLast {