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/io/path/PathTreeWalk.java

@@ -0,0 +1,95 @@
+package kotlin.io.path;
+
+import java.nio.file.FileSystemLoopException;
+import java.nio.file.Files;
+import java.nio.file.LinkOption;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+import kotlin.Metadata;
+import kotlin.Unit;
+import kotlin.collections.ArraysKt;
+import kotlin.coroutines.Continuation;
+import kotlin.jvm.functions.Function1;
+import kotlin.jvm.internal.InlineMarker;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.sequences.Sequence;
+import kotlin.sequences.SequenceScope;
+import kotlin.sequences.SequencesKt;
+
+@Metadata(d1 = {"\u0000V\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0010\u0011\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0010\u000b\n\u0002\b\u0006\n\u0002\u0018\u0002\n\u0002\b\u0004\n\u0002\u0010(\n\u0002\b\u0003\n\u0002\u0010\u0002\n\u0002\u0018\u0002\n\u0000\n\u0002\u0018\u0002\n\u0000\n\u0002\u0018\u0002\n\u0000\n\u0002\u0018\u0002\n\u0002\u0010 \n\u0002\b\u0002\b\u0001\u0018\u00002\b\u0012\u0004\u0012\u00020\u00020\u0001B\u001d\u0012\u0006\u0010\u0003\u001a\u00020\u0002\u0012\u000e\u0010\u0004\u001a\n\u0012\u0006\b\u0001\u0012\u00020\u00060\u0005¢\u0006\u0002\u0010\u0007J\u000e\u0010\u0014\u001a\b\u0012\u0004\u0012\u00020\u00020\u0015H\u0002J\u000e\u0010\u0016\u001a\b\u0012\u0004\u0012\u00020\u00020\u0015H\u0002J\u000f\u0010\u0017\u001a\b\u0012\u0004\u0012\u00020\u00020\u0015H\u0096\u0002JB\u0010\u0018\u001a\u00020\u0019*\b\u0012\u0004\u0012\u00020\u00020\u001a2\u0006\u0010\u001b\u001a\u00020\u001c2\u0006\u0010\u001d\u001a\u00020\u001e2\u0018\u0010\u001f\u001a\u0014\u0012\n\u0012\b\u0012\u0004\u0012\u00020\u001c0!\u0012\u0004\u0012\u00020\u00190 H\u0082H¢\u0006\u0002\u0010\"R\u0014\u0010\b\u001a\u00020\t8BX\u0082\u0004¢\u0006\u0006\u001a\u0004\b\n\u0010\u000bR\u0014\u0010\f\u001a\u00020\t8BX\u0082\u0004¢\u0006\u0006\u001a\u0004\b\r\u0010\u000bR\u0014\u0010\u000e\u001a\u00020\t8BX\u0082\u0004¢\u0006\u0006\u001a\u0004\b\u000e\u0010\u000bR\u001a\u0010\u000f\u001a\b\u0012\u0004\u0012\u00020\u00100\u00058BX\u0082\u0004¢\u0006\u0006\u001a\u0004\b\u0011\u0010\u0012R\u0018\u0010\u0004\u001a\n\u0012\u0006\b\u0001\u0012\u00020\u00060\u0005X\u0082\u0004¢\u0006\u0004\n\u0002\u0010\u0013R\u000e\u0010\u0003\u001a\u00020\u0002X\u0082\u0004¢\u0006\u0002\n\u0000¨\u0006#"}, d2 = {"Lkotlin/io/path/PathTreeWalk;", "Lkotlin/sequences/Sequence;", "Ljava/nio/file/Path;", "start", "options", "", "Lkotlin/io/path/PathWalkOption;", "(Ljava/nio/file/Path;[Lkotlin/io/path/PathWalkOption;)V", "followLinks", "", "getFollowLinks", "()Z", "includeDirectories", "getIncludeDirectories", "isBFS", "linkOptions", "Ljava/nio/file/LinkOption;", "getLinkOptions", "()[Ljava/nio/file/LinkOption;", "[Lkotlin/io/path/PathWalkOption;", "bfsIterator", "", "dfsIterator", "iterator", "yieldIfNeeded", "", "Lkotlin/sequences/SequenceScope;", "node", "Lkotlin/io/path/PathNode;", "entriesReader", "Lkotlin/io/path/DirectoryEntriesReader;", "entriesAction", "Lkotlin/Function1;", "", "(Lkotlin/sequences/SequenceScope;Lkotlin/io/path/PathNode;Lkotlin/io/path/DirectoryEntriesReader;Lkotlin/jvm/functions/Function1;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;", "kotlin-stdlib-jdk7"}, k = 1, mv = {1, 9, 0}, xi = 48)
+@ExperimentalPathApi
+/* loaded from: classes3.dex */
+public final class PathTreeWalk implements Sequence<Path> {
+    private final PathWalkOption[] options;
+    private final Path start;
+
+    public PathTreeWalk(Path start, PathWalkOption[] options) {
+        Intrinsics.checkNotNullParameter(start, "start");
+        Intrinsics.checkNotNullParameter(options, "options");
+        this.start = start;
+        this.options = options;
+    }
+
+    private final Iterator<Path> bfsIterator() {
+        return SequencesKt.iterator(new PathTreeWalk$bfsIterator$1(this, null));
+    }
+
+    private final Iterator<Path> dfsIterator() {
+        return SequencesKt.iterator(new PathTreeWalk$dfsIterator$1(this, null));
+    }
+
+    /* JADX INFO: Access modifiers changed from: private */
+    public final boolean getFollowLinks() {
+        return ArraysKt.contains(this.options, PathWalkOption.FOLLOW_LINKS);
+    }
+
+    /* JADX INFO: Access modifiers changed from: private */
+    public final boolean getIncludeDirectories() {
+        return ArraysKt.contains(this.options, PathWalkOption.INCLUDE_DIRECTORIES);
+    }
+
+    /* JADX INFO: Access modifiers changed from: private */
+    public final LinkOption[] getLinkOptions() {
+        return LinkFollowing.INSTANCE.toLinkOptions(getFollowLinks());
+    }
+
+    private final boolean isBFS() {
+        return ArraysKt.contains(this.options, PathWalkOption.BREADTH_FIRST);
+    }
+
+    private final Object yieldIfNeeded(SequenceScope<? super Path> sequenceScope, PathNode pathNode, DirectoryEntriesReader directoryEntriesReader, Function1<? super List<PathNode>, Unit> function1, Continuation<? super Unit> continuation) {
+        boolean createsCycle;
+        Path path = pathNode.getPath();
+        LinkOption[] linkOptions = getLinkOptions();
+        LinkOption[] linkOptionArr = (LinkOption[]) Arrays.copyOf(linkOptions, linkOptions.length);
+        if (Files.isDirectory(path, (LinkOption[]) Arrays.copyOf(linkOptionArr, linkOptionArr.length))) {
+            createsCycle = PathTreeWalkKt.createsCycle(pathNode);
+            if (createsCycle) {
+                throw new FileSystemLoopException(path.toString());
+            }
+            if (getIncludeDirectories()) {
+                InlineMarker.mark(0);
+                sequenceScope.yield(path, continuation);
+                InlineMarker.mark(1);
+            }
+            LinkOption[] linkOptions2 = getLinkOptions();
+            LinkOption[] linkOptionArr2 = (LinkOption[]) Arrays.copyOf(linkOptions2, linkOptions2.length);
+            if (Files.isDirectory(path, (LinkOption[]) Arrays.copyOf(linkOptionArr2, linkOptionArr2.length))) {
+                function1.invoke(directoryEntriesReader.readEntries(pathNode));
+            }
+        } else if (Files.exists(path, (LinkOption[]) Arrays.copyOf(new LinkOption[]{LinkOption.NOFOLLOW_LINKS}, 1))) {
+            InlineMarker.mark(0);
+            sequenceScope.yield(path, continuation);
+            InlineMarker.mark(1);
+            return Unit.INSTANCE;
+        }
+        return Unit.INSTANCE;
+    }
+
+    @Override // kotlin.sequences.Sequence
+    public Iterator<Path> iterator() {
+        return isBFS() ? bfsIterator() : dfsIterator();
+    }
+}