Exclude protocol libraries from loading at application startup

client/android/utils/src/main/kotlin/LibraryLoader.kt

@@ -0,0 +1,66 @@
+package org.amnezia.vpn.util
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.os.Build
+import java.io.File
+import java.io.FileOutputStream
+import java.util.zip.ZipFile
+
+private const val TAG = "LibraryLoader"
+
+object LibraryLoader {
+    private fun extractLibrary(context: Context, libraryName: String, destination: File): Boolean {
+        Log.d(TAG, "Extracting library: $libraryName")
+        val apks = hashSetOf<String>()
+        context.applicationInfo.run {
+            sourceDir?.let { apks += it }
+            splitSourceDirs?.let { apks += it }
+        }
+        for (abi in Build.SUPPORTED_ABIS) {
+            for (apk in apks) {
+                ZipFile(File(apk), ZipFile.OPEN_READ).use { zipFile ->
+                    val mappedName = System.mapLibraryName(libraryName)
+                    val libraryZipPath = listOf("lib", abi, mappedName).joinToString(File.separator)
+                    val zipEntry = zipFile.getEntry(libraryZipPath)
+                    zipEntry?.let {
+                        Log.d(TAG, "Extracting apk:/$libraryZipPath to ${destination.absolutePath}")
+                        FileOutputStream(destination).use { outStream ->
+                            zipFile.getInputStream(zipEntry).use { inStream ->
+                                inStream.copyTo(outStream, 32 * 1024)
+                                outStream.fd.sync()
+                            }
+                        }
+                    }
+                    return true
+                }
+            }
+        }
+        return false
+    }
+
+    @SuppressLint("UnsafeDynamicallyLoadedCode")
+    fun loadSharedLibrary(context: Context, libraryName: String) {
+        Log.d(TAG, "Loading library: $libraryName")
+        try {
+            System.loadLibrary(libraryName)
+            return
+        } catch (_: UnsatisfiedLinkError) {
+            Log.d(TAG, "Failed to load library, try to extract it from apk")
+        }
+        var tempFile: File? = null
+        try {
+            tempFile = File.createTempFile("lib", ".so", context.codeCacheDir)
+            if (extractLibrary(context, libraryName, tempFile)) {
+                System.load(tempFile.absolutePath)
+                return
+            }
+        } catch (e: Exception) {
+            throw LoadLibraryException("Failed to load library apk: $libraryName", e)
+        } finally {
+            tempFile?.delete()
+        }
+    }
+}
+
+class LoadLibraryException(message: String? = null, cause: Throwable? = null) : Exception(message, cause)