public static IEnumerable ParseComObjects()

in Lib/Collectors/ComObjectCollector.cs [29:140]
94 lines of code
28 McCabe index (conditional complexity)

        public static IEnumerable<CollectObject> ParseComObjects(RegistryKey SearchKey, RegistryView View, bool SingleThreaded = false)
        {
            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) { return new List<CollectObject>(); }
            if (SearchKey == null) { return new List<CollectObject>(); }
            List<ComObject> comObjects = new List<ComObject>();
            var fsc = new FileSystemCollector(new CollectorOptions() { SingleThread = SingleThreaded });
            Action<string> ParseComObjectsIn = SubKeyName =>
            {
                try
                {
                    RegistryKey CurrentKey = SearchKey.OpenSubKey(SubKeyName);

                    var RegObj = RegistryWalker.RegistryKeyToRegistryObject(CurrentKey, View);

                    if (RegObj != null)
                    {
                        ComObject comObject = new ComObject(RegObj);

                        foreach (string ComDetails in CurrentKey.GetSubKeyNames())
                        {
                            if (ComDetails.Contains("InprocServer32"))
                            {
                                var ComKey = CurrentKey.OpenSubKey(ComDetails);
                                var obj = RegistryWalker.RegistryKeyToRegistryObject(ComKey, View);
                                string? BinaryPath32 = null;

                                if (obj != null && obj.Values?.TryGetValue("", out BinaryPath32) is bool successful)
                                {
                                    if (successful && BinaryPath32 != null)
                                    {
                                        // Clean up cases where some extra spaces are thrown into the start
                                        // (breaks our permission checker)
                                        BinaryPath32 = BinaryPath32.Trim();
                                        // Clean up cases where the binary is quoted (also breaks permission checker)
                                        if (BinaryPath32.StartsWith("\"") && BinaryPath32.EndsWith("\""))
                                        {
                                            BinaryPath32 = BinaryPath32.AsSpan().Slice(1, BinaryPath32.Length - 2).ToString();
                                        }
                                        // Unqualified binary name probably comes from Windows\System32
                                        if (!BinaryPath32.Contains("\\") && !BinaryPath32.Contains("%"))
                                        {
                                            BinaryPath32 = Path.Combine(Environment.SystemDirectory, BinaryPath32.Trim());
                                        }

                                        comObject.x86_Binary = fsc.FilePathToFileSystemObject(BinaryPath32.Trim());
                                    }
                                }
                            }
                            if (ComDetails.Contains("InprocServer64"))
                            {
                                var ComKey = CurrentKey.OpenSubKey(ComDetails);
                                var obj = RegistryWalker.RegistryKeyToRegistryObject(ComKey, View);
                                string? BinaryPath64 = null;

                                if (obj != null && obj.Values?.TryGetValue("", out BinaryPath64) is bool successful)
                                {
                                    if (successful && BinaryPath64 != null)
                                    {
                                        // Clean up cases where some extra spaces are thrown into the start
                                        // (breaks our permission checker)
                                        BinaryPath64 = BinaryPath64.Trim();
                                        // Clean up cases where the binary is quoted (also breaks permission checker)
                                        if (BinaryPath64.StartsWith("\"") && BinaryPath64.EndsWith("\""))
                                        {
                                            BinaryPath64 = BinaryPath64.AsSpan().Slice(1, BinaryPath64.Length - 2).ToString();
                                        }
                                        // Unqualified binary name probably comes from Windows\System32
                                        if (!BinaryPath64.Contains("\\") && !BinaryPath64.Contains("%"))
                                        {
                                            BinaryPath64 = Path.Combine(Environment.SystemDirectory, BinaryPath64.Trim());
                                        }

                                        comObject.x64_Binary = fsc.FilePathToFileSystemObject(BinaryPath64.Trim());
                                    }
                                }
                            }
                        }

                        comObjects.Add(comObject);
                    }
                }
                catch (Exception e) when (
                    e is System.Security.SecurityException
                    || e is ObjectDisposedException
                    || e is UnauthorizedAccessException
                    || e is IOException)
                {
                    Log.Debug($"Couldn't parse {SubKeyName}");
                }
            };

            try
            {
                if (SingleThreaded)
                {
                    foreach (var subKey in SearchKey.GetSubKeyNames())
                    {
                        ParseComObjectsIn(subKey);
                    }
                }
                else
                {
                    SearchKey.GetSubKeyNames().AsParallel().ForAll(subKey => ParseComObjectsIn(subKey));
                }
            }
            catch (Exception e)
            {
                Log.Debug("Failing parsing com objects {0} {1}", SearchKey.Name, e.GetType());
            }

            return comObjects;
        }