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/sessions/SessionGenerator.java

@@ -0,0 +1,101 @@
+package com.google.firebase.sessions;
+
+import com.google.firebase.Firebase;
+import com.google.firebase.FirebaseKt;
+import java.util.Locale;
+import java.util.UUID;
+import kotlin.Metadata;
+import kotlin.jvm.functions.Function0;
+import kotlin.jvm.internal.DefaultConstructorMarker;
+import kotlin.jvm.internal.FunctionReferenceImpl;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.text.StringsKt__StringsJVMKt;
+
+@Metadata(d1 = {"\u0000:\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0000\n\u0002\u0018\u0002\n\u0000\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0002\b\u0004\n\u0002\u0010\u000e\n\u0000\n\u0002\u0010\u000b\n\u0002\b\u0003\n\u0002\u0010\b\n\u0002\b\u0004\b\u0000\u0018\u0000 \u00172\u00020\u0001:\u0001\u0017B\u001d\u0012\u0006\u0010\u0002\u001a\u00020\u0003\u0012\u000e\b\u0002\u0010\u0004\u001a\b\u0012\u0004\u0012\u00020\u00060\u0005¢\u0006\u0002\u0010\u0007J\u0006\u0010\u0015\u001a\u00020\tJ\b\u0010\u0016\u001a\u00020\u000eH\u0002R\u001e\u0010\n\u001a\u00020\t2\u0006\u0010\b\u001a\u00020\t@BX\u0086.¢\u0006\b\n\u0000\u001a\u0004\b\u000b\u0010\fR\u000e\u0010\r\u001a\u00020\u000eX\u0082\u0004¢\u0006\u0002\n\u0000R\u0011\u0010\u000f\u001a\u00020\u00108F¢\u0006\u0006\u001a\u0004\b\u0011\u0010\u0012R\u000e\u0010\u0013\u001a\u00020\u0014X\u0082\u000e¢\u0006\u0002\n\u0000R\u000e\u0010\u0002\u001a\u00020\u0003X\u0082\u0004¢\u0006\u0002\n\u0000R\u0014\u0010\u0004\u001a\b\u0012\u0004\u0012\u00020\u00060\u0005X\u0082\u0004¢\u0006\u0002\n\u0000¨\u0006\u0018"}, d2 = {"Lcom/google/firebase/sessions/SessionGenerator;", "", "timeProvider", "Lcom/google/firebase/sessions/TimeProvider;", "uuidGenerator", "Lkotlin/Function0;", "Ljava/util/UUID;", "(Lcom/google/firebase/sessions/TimeProvider;Lkotlin/jvm/functions/Function0;)V", "<set-?>", "Lcom/google/firebase/sessions/SessionDetails;", "currentSession", "getCurrentSession", "()Lcom/google/firebase/sessions/SessionDetails;", "firstSessionId", "", "hasGenerateSession", "", "getHasGenerateSession", "()Z", "sessionIndex", "", "generateNewSession", "generateSessionId", "Companion", "com.google.firebase-firebase-sessions"}, k = 1, mv = {1, 7, 1}, xi = 48)
+/* loaded from: classes3.dex */
+public final class SessionGenerator {
+
+    /* renamed from: Companion, reason: from kotlin metadata */
+    public static final Companion INSTANCE = new Companion(null);
+    private SessionDetails currentSession;
+    private final String firstSessionId;
+    private int sessionIndex;
+    private final TimeProvider timeProvider;
+    private final Function0<UUID> uuidGenerator;
+
+    @Metadata(k = 3, mv = {1, 7, 1}, xi = 48)
+    /* renamed from: com.google.firebase.sessions.SessionGenerator$1, reason: invalid class name */
+    /* loaded from: classes3.dex */
+    public /* synthetic */ class AnonymousClass1 extends FunctionReferenceImpl implements Function0<UUID> {
+        public static final AnonymousClass1 INSTANCE = new AnonymousClass1();
+
+        public AnonymousClass1() {
+            super(0, UUID.class, "randomUUID", "randomUUID()Ljava/util/UUID;", 0);
+        }
+
+        @Override // kotlin.jvm.functions.Function0
+        public final UUID invoke() {
+            return UUID.randomUUID();
+        }
+    }
+
+    @Metadata(d1 = {"\u0000\u0014\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0002\b\u0003\b\u0080\u0003\u0018\u00002\u00020\u0001B\u0007\b\u0002¢\u0006\u0002\u0010\u0002R\u0011\u0010\u0003\u001a\u00020\u00048F¢\u0006\u0006\u001a\u0004\b\u0005\u0010\u0006¨\u0006\u0007"}, d2 = {"Lcom/google/firebase/sessions/SessionGenerator$Companion;", "", "()V", "instance", "Lcom/google/firebase/sessions/SessionGenerator;", "getInstance", "()Lcom/google/firebase/sessions/SessionGenerator;", "com.google.firebase-firebase-sessions"}, k = 1, mv = {1, 7, 1}, xi = 48)
+    /* loaded from: classes3.dex */
+    public static final class Companion {
+        public /* synthetic */ Companion(DefaultConstructorMarker defaultConstructorMarker) {
+            this();
+        }
+
+        public final SessionGenerator getInstance() {
+            Object obj = FirebaseKt.getApp(Firebase.INSTANCE).get(SessionGenerator.class);
+            Intrinsics.checkNotNullExpressionValue(obj, "Firebase.app[SessionGenerator::class.java]");
+            return (SessionGenerator) obj;
+        }
+
+        private Companion() {
+        }
+    }
+
+    public SessionGenerator(TimeProvider timeProvider, Function0<UUID> uuidGenerator) {
+        Intrinsics.checkNotNullParameter(timeProvider, "timeProvider");
+        Intrinsics.checkNotNullParameter(uuidGenerator, "uuidGenerator");
+        this.timeProvider = timeProvider;
+        this.uuidGenerator = uuidGenerator;
+        this.firstSessionId = generateSessionId();
+        this.sessionIndex = -1;
+    }
+
+    private final String generateSessionId() {
+        String replace$default;
+        String uuid = this.uuidGenerator.invoke().toString();
+        Intrinsics.checkNotNullExpressionValue(uuid, "uuidGenerator().toString()");
+        replace$default = StringsKt__StringsJVMKt.replace$default(uuid, "-", "", false, 4, (Object) null);
+        String lowerCase = replace$default.toLowerCase(Locale.ROOT);
+        Intrinsics.checkNotNullExpressionValue(lowerCase, "this as java.lang.String).toLowerCase(Locale.ROOT)");
+        return lowerCase;
+    }
+
+    public final SessionDetails generateNewSession() {
+        int i = this.sessionIndex + 1;
+        this.sessionIndex = i;
+        this.currentSession = new SessionDetails(i == 0 ? this.firstSessionId : generateSessionId(), this.firstSessionId, this.sessionIndex, this.timeProvider.currentTimeUs());
+        return getCurrentSession();
+    }
+
+    public final SessionDetails getCurrentSession() {
+        SessionDetails sessionDetails = this.currentSession;
+        if (sessionDetails != null) {
+            return sessionDetails;
+        }
+        Intrinsics.throwUninitializedPropertyAccessException("currentSession");
+        return null;
+    }
+
+    public final boolean getHasGenerateSession() {
+        return this.currentSession != null;
+    }
+
+    public /* synthetic */ SessionGenerator(TimeProvider timeProvider, Function0 function0, int i, DefaultConstructorMarker defaultConstructorMarker) {
+        this(timeProvider, (i & 2) != 0 ? AnonymousClass1.INSTANCE : function0);
+    }
+}