Primer paso de la investigacion. Se aportan el .apk, las carpetas con el apk extraido y el apk descompilado. El archivo API_DOCUMENTATION.md es un archivo donde se anotaran los descubrimientos del funcionamiento de la API, y los .py son scripts para probar la funcionalidad de la API con los métodos que vayamos encontrando. Finalmente, los archivos .js son scripts de Frida para extraer informacion de la APP durante la ejecucion.

apk_decompiled/sources/kotlin/reflect/full/Java8RepeatableContainerLoader.java

@@ -0,0 +1,71 @@
+package kotlin.reflect.full;
+
+import java.lang.annotation.Annotation;
+import java.lang.annotation.Repeatable;
+import java.lang.reflect.Method;
+import kotlin.Metadata;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.jvm.internal.SourceDebugExtension;
+
+@Metadata(d1 = {"\u0000 \n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0002\b\u0006\n\u0002\u0018\u0002\n\u0002\u0010\u001b\n\u0002\b\u0003\bÂ\u0002\u0018\u00002\u00020\u0001:\u0001\u000eB\u0007\b\u0002¢\u0006\u0002\u0010\u0002J\b\u0010\t\u001a\u00020\u0004H\u0002J \u0010\n\u001a\f\u0012\u0006\b\u0001\u0012\u00020\f\u0018\u00010\u000b2\u000e\u0010\r\u001a\n\u0012\u0006\b\u0001\u0012\u00020\f0\u000bR\u001c\u0010\u0003\u001a\u0004\u0018\u00010\u0004X\u0086\u000e¢\u0006\u000e\n\u0000\u001a\u0004\b\u0005\u0010\u0006\"\u0004\b\u0007\u0010\b¨\u0006\u000f"}, d2 = {"Lkotlin/reflect/full/Java8RepeatableContainerLoader;", "", "()V", "cache", "Lkotlin/reflect/full/Java8RepeatableContainerLoader$Cache;", "getCache", "()Lkotlin/reflect/full/Java8RepeatableContainerLoader$Cache;", "setCache", "(Lkotlin/reflect/full/Java8RepeatableContainerLoader$Cache;)V", "buildCache", "loadRepeatableContainer", "Ljava/lang/Class;", "", "klass", "Cache", "kotlin-reflection"}, k = 1, mv = {1, 9, 0}, xi = 48)
+@SourceDebugExtension({"SMAP\nKAnnotatedElements.kt\nKotlin\n*S Kotlin\n*F\n+ 1 KAnnotatedElements.kt\nkotlin/reflect/full/Java8RepeatableContainerLoader\n+ 2 fake.kt\nkotlin/jvm/internal/FakeKt\n*L\n1#1,102:1\n1#2:103\n*E\n"})
+/* loaded from: classes3.dex */
+final class Java8RepeatableContainerLoader {
+    public static final Java8RepeatableContainerLoader INSTANCE = new Java8RepeatableContainerLoader();
+    private static Cache cache;
+
+    @Metadata(d1 = {"\u0000\u001c\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0000\n\u0002\u0018\u0002\n\u0002\u0010\u001b\n\u0000\n\u0002\u0018\u0002\n\u0002\b\u0006\u0018\u00002\u00020\u0001B!\u0012\u0010\u0010\u0002\u001a\f\u0012\u0006\b\u0001\u0012\u00020\u0004\u0018\u00010\u0003\u0012\b\u0010\u0005\u001a\u0004\u0018\u00010\u0006¢\u0006\u0002\u0010\u0007R\u001b\u0010\u0002\u001a\f\u0012\u0006\b\u0001\u0012\u00020\u0004\u0018\u00010\u0003¢\u0006\b\n\u0000\u001a\u0004\b\b\u0010\tR\u0013\u0010\u0005\u001a\u0004\u0018\u00010\u0006¢\u0006\b\n\u0000\u001a\u0004\b\n\u0010\u000b¨\u0006\f"}, d2 = {"Lkotlin/reflect/full/Java8RepeatableContainerLoader$Cache;", "", "repeatableClass", "Ljava/lang/Class;", "", "valueMethod", "Ljava/lang/reflect/Method;", "(Ljava/lang/Class;Ljava/lang/reflect/Method;)V", "getRepeatableClass", "()Ljava/lang/Class;", "getValueMethod", "()Ljava/lang/reflect/Method;", "kotlin-reflection"}, k = 1, mv = {1, 9, 0}, xi = 48)
+    /* loaded from: classes3.dex */
+    public static final class Cache {
+        private final Class<? extends Annotation> repeatableClass;
+        private final Method valueMethod;
+
+        public Cache(Class<? extends Annotation> cls, Method method) {
+            this.repeatableClass = cls;
+            this.valueMethod = method;
+        }
+
+        public final Class<? extends Annotation> getRepeatableClass() {
+            return this.repeatableClass;
+        }
+
+        public final Method getValueMethod() {
+            return this.valueMethod;
+        }
+    }
+
+    private Java8RepeatableContainerLoader() {
+    }
+
+    private final Cache buildCache() {
+        try {
+            Intrinsics.checkNotNull(Repeatable.class, "null cannot be cast to non-null type java.lang.Class<out kotlin.Annotation>");
+            return new Cache(Repeatable.class, Repeatable.class.getMethod("value", new Class[0]));
+        } catch (ClassNotFoundException unused) {
+            return new Cache(null, null);
+        }
+    }
+
+    public final Class<? extends Annotation> loadRepeatableContainer(Class<? extends Annotation> klass) {
+        Annotation annotation;
+        Method valueMethod;
+        Intrinsics.checkNotNullParameter(klass, "klass");
+        Cache cache2 = cache;
+        if (cache2 == null) {
+            synchronized (this) {
+                cache2 = cache;
+                if (cache2 == null) {
+                    cache2 = INSTANCE.buildCache();
+                    cache = cache2;
+                }
+            }
+        }
+        Class repeatableClass = cache2.getRepeatableClass();
+        if (repeatableClass == null || (annotation = klass.getAnnotation(repeatableClass)) == null || (valueMethod = cache2.getValueMethod()) == null) {
+            return null;
+        }
+        Object invoke = valueMethod.invoke(annotation, new Object[0]);
+        Intrinsics.checkNotNull(invoke, "null cannot be cast to non-null type java.lang.Class<out kotlin.Annotation>");
+        return (Class) invoke;
+    }
+}