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/f0/C0340d.java

@@ -0,0 +1,73 @@
+package f0;
+
+import android.text.InputFilter;
+import android.text.Selection;
+import android.text.Spannable;
+import android.widget.TextView;
+import java.lang.ref.WeakReference;
+
+/* renamed from: f0.d, reason: case insensitive filesystem */
+/* loaded from: classes.dex */
+public final class C0340d extends d0.f {
+
+    /* renamed from: a, reason: collision with root package name */
+    public final WeakReference f6451a;
+
+    /* renamed from: b, reason: collision with root package name */
+    public final WeakReference f6452b;
+
+    public C0340d(TextView textView, C0341e c0341e) {
+        this.f6451a = new WeakReference(textView);
+        this.f6452b = new WeakReference(c0341e);
+    }
+
+    @Override // d0.f
+    public final void b() {
+        InputFilter[] filters;
+        int length;
+        TextView textView = (TextView) this.f6451a.get();
+        InputFilter inputFilter = (InputFilter) this.f6452b.get();
+        if (inputFilter == null || textView == null || (filters = textView.getFilters()) == null) {
+            return;
+        }
+        for (InputFilter inputFilter2 : filters) {
+            if (inputFilter2 == inputFilter) {
+                if (textView.isAttachedToWindow()) {
+                    CharSequence text = textView.getText();
+                    d0.h a2 = d0.h.a();
+                    if (text == null) {
+                        length = 0;
+                    } else {
+                        a2.getClass();
+                        length = text.length();
+                    }
+                    CharSequence e4 = a2.e(text, 0, length);
+                    if (text == e4) {
+                        return;
+                    }
+                    int selectionStart = Selection.getSelectionStart(e4);
+                    int selectionEnd = Selection.getSelectionEnd(e4);
+                    textView.setText(e4);
+                    if (e4 instanceof Spannable) {
+                        Spannable spannable = (Spannable) e4;
+                        if (selectionStart >= 0 && selectionEnd >= 0) {
+                            Selection.setSelection(spannable, selectionStart, selectionEnd);
+                            return;
+                        } else if (selectionStart >= 0) {
+                            Selection.setSelection(spannable, selectionStart);
+                            return;
+                        } else {
+                            if (selectionEnd >= 0) {
+                                Selection.setSelection(spannable, selectionEnd);
+                                return;
+                            }
+                            return;
+                        }
+                    }
+                    return;
+                }
+                return;
+            }
+        }
+    }
+}