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/com/google/firebase/concurrent/LimitedConcurrencyExecutorService.java

@@ -0,0 +1,93 @@
+package com.google.firebase.concurrent;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Future;
+import java.util.concurrent.FutureTask;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/* loaded from: classes3.dex */
+final class LimitedConcurrencyExecutorService extends LimitedConcurrencyExecutor implements ExecutorService {
+    private final ExecutorService delegate;
+
+    public LimitedConcurrencyExecutorService(ExecutorService executorService, int i) {
+        super(executorService, i);
+        this.delegate = executorService;
+    }
+
+    public static /* synthetic */ Object lambda$submit$0(Runnable runnable, Object obj) throws Exception {
+        runnable.run();
+        return obj;
+    }
+
+    public static /* synthetic */ Object lambda$submit$1(Runnable runnable) throws Exception {
+        runnable.run();
+        return null;
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public boolean awaitTermination(long j4, TimeUnit timeUnit) throws InterruptedException {
+        return this.delegate.awaitTermination(j4, timeUnit);
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> collection) throws InterruptedException {
+        return this.delegate.invokeAll(collection);
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public <T> T invokeAny(Collection<? extends Callable<T>> collection) throws ExecutionException, InterruptedException {
+        return (T) this.delegate.invokeAny(collection);
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public boolean isShutdown() {
+        return this.delegate.isShutdown();
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public boolean isTerminated() {
+        return this.delegate.isTerminated();
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public void shutdown() {
+        throw new UnsupportedOperationException("Shutting down is not allowed.");
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public List<Runnable> shutdownNow() {
+        throw new UnsupportedOperationException("Shutting down is not allowed.");
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public <T> Future<T> submit(Callable<T> callable) {
+        FutureTask futureTask = new FutureTask(callable);
+        execute(futureTask);
+        return futureTask;
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> collection, long j4, TimeUnit timeUnit) throws InterruptedException {
+        return this.delegate.invokeAll(collection, j4, timeUnit);
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public <T> T invokeAny(Collection<? extends Callable<T>> collection, long j4, TimeUnit timeUnit) throws ExecutionException, InterruptedException, TimeoutException {
+        return (T) this.delegate.invokeAny(collection, j4, timeUnit);
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public <T> Future<T> submit(Runnable runnable, T t2) {
+        return submit(new i(runnable, t2, 0));
+    }
+
+    @Override // java.util.concurrent.ExecutorService
+    public Future<?> submit(Runnable runnable) {
+        return submit(new h(runnable, 0));
+    }
+}