xref: /webtrees/app/Services/ModuleService.php (revision db3aeb3eb846bb233f34557aedb1559aadf9275a)
1<?php
2/**
3 * webtrees: online genealogy
4 * Copyright (C) 2019 webtrees development team
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16declare(strict_types=1);
17
18namespace Fisharebest\Webtrees\Services;
19
20use Closure;
21use Fisharebest\Webtrees\Auth;
22use Fisharebest\Webtrees\Contracts\UserInterface;
23use Fisharebest\Webtrees\FlashMessages;
24use Fisharebest\Webtrees\I18N;
25use Fisharebest\Webtrees\Module\AhnentafelReportModule;
26use Fisharebest\Webtrees\Module\AlbumModule;
27use Fisharebest\Webtrees\Module\AncestorsChartModule;
28use Fisharebest\Webtrees\Module\BatchUpdateModule;
29use Fisharebest\Webtrees\Module\BingWebmasterToolsModule;
30use Fisharebest\Webtrees\Module\BirthDeathMarriageReportModule;
31use Fisharebest\Webtrees\Module\BirthReportModule;
32use Fisharebest\Webtrees\Module\BranchesListModule;
33use Fisharebest\Webtrees\Module\CalendarMenuModule;
34use Fisharebest\Webtrees\Module\CemeteryReportModule;
35use Fisharebest\Webtrees\Module\CensusAssistantModule;
36use Fisharebest\Webtrees\Module\ChangeReportModule;
37use Fisharebest\Webtrees\Module\ChartsBlockModule;
38use Fisharebest\Webtrees\Module\ChartsMenuModule;
39use Fisharebest\Webtrees\Module\CkeditorModule;
40use Fisharebest\Webtrees\Module\ClippingsCartModule;
41use Fisharebest\Webtrees\Module\CloudsTheme;
42use Fisharebest\Webtrees\Module\ColorsTheme;
43use Fisharebest\Webtrees\Module\CompactTreeChartModule;
44use Fisharebest\Webtrees\Module\ContactsFooterModule;
45use Fisharebest\Webtrees\Module\CookieWarningModule;
46use Fisharebest\Webtrees\Module\DeathReportModule;
47use Fisharebest\Webtrees\Module\DescendancyChartModule;
48use Fisharebest\Webtrees\Module\DescendancyModule;
49use Fisharebest\Webtrees\Module\DescendancyReportModule;
50use Fisharebest\Webtrees\Module\IndividualMetadataModule;
51use Fisharebest\Webtrees\Module\FabTheme;
52use Fisharebest\Webtrees\Module\FactSourcesReportModule;
53use Fisharebest\Webtrees\Module\FamilyBookChartModule;
54use Fisharebest\Webtrees\Module\FamilyGroupReportModule;
55use Fisharebest\Webtrees\Module\FamilyListModule;
56use Fisharebest\Webtrees\Module\FamilyNavigatorModule;
57use Fisharebest\Webtrees\Module\FamilyTreeFavoritesModule;
58use Fisharebest\Webtrees\Module\FamilyTreeNewsModule;
59use Fisharebest\Webtrees\Module\FamilyTreeStatisticsModule;
60use Fisharebest\Webtrees\Module\FanChartModule;
61use Fisharebest\Webtrees\Module\FrequentlyAskedQuestionsModule;
62use Fisharebest\Webtrees\Module\GoogleAnalyticsModule;
63use Fisharebest\Webtrees\Module\GoogleWebmasterToolsModule;
64use Fisharebest\Webtrees\Module\HitCountFooterModule;
65use Fisharebest\Webtrees\Module\HourglassChartModule;
66use Fisharebest\Webtrees\Module\HtmlBlockModule;
67use Fisharebest\Webtrees\Module\IndividualFactsTabModule;
68use Fisharebest\Webtrees\Module\IndividualFamiliesReportModule;
69use Fisharebest\Webtrees\Module\IndividualListModule;
70use Fisharebest\Webtrees\Module\IndividualReportModule;
71use Fisharebest\Webtrees\Module\InteractiveTreeModule;
72use Fisharebest\Webtrees\Module\LifespansChartModule;
73use Fisharebest\Webtrees\Module\ListsMenuModule;
74use Fisharebest\Webtrees\Module\LoggedInUsersModule;
75use Fisharebest\Webtrees\Module\LoginBlockModule;
76use Fisharebest\Webtrees\Module\MarriageReportModule;
77use Fisharebest\Webtrees\Module\MatomoAnalyticsModule;
78use Fisharebest\Webtrees\Module\MediaListModule;
79use Fisharebest\Webtrees\Module\MediaTabModule;
80use Fisharebest\Webtrees\Module\MinimalTheme;
81use Fisharebest\Webtrees\Module\MissingFactsReportModule;
82use Fisharebest\Webtrees\Module\ModuleAnalyticsInterface;
83use Fisharebest\Webtrees\Module\ModuleBlockInterface;
84use Fisharebest\Webtrees\Module\ModuleChartInterface;
85use Fisharebest\Webtrees\Module\ModuleConfigInterface;
86use Fisharebest\Webtrees\Module\ModuleCustomInterface;
87use Fisharebest\Webtrees\Module\ModuleFooterInterface;
88use Fisharebest\Webtrees\Module\ModuleHistoricEventsInterface;
89use Fisharebest\Webtrees\Module\ModuleInterface;
90use Fisharebest\Webtrees\Module\ModuleLanguageInterface;
91use Fisharebest\Webtrees\Module\ModuleListInterface;
92use Fisharebest\Webtrees\Module\ModuleMenuInterface;
93use Fisharebest\Webtrees\Module\ModuleReportInterface;
94use Fisharebest\Webtrees\Module\ModuleSidebarInterface;
95use Fisharebest\Webtrees\Module\ModuleTabInterface;
96use Fisharebest\Webtrees\Module\ModuleThemeInterface;
97use Fisharebest\Webtrees\Module\NoteListModule;
98use Fisharebest\Webtrees\Module\NotesTabModule;
99use Fisharebest\Webtrees\Module\OccupationReportModule;
100use Fisharebest\Webtrees\Module\OnThisDayModule;
101use Fisharebest\Webtrees\Module\PedigreeChartModule;
102use Fisharebest\Webtrees\Module\PedigreeMapModule;
103use Fisharebest\Webtrees\Module\PedigreeReportModule;
104use Fisharebest\Webtrees\Module\PlaceHierarchyListModule;
105use Fisharebest\Webtrees\Module\PlacesModule;
106use Fisharebest\Webtrees\Module\PoweredByWebtreesModule;
107use Fisharebest\Webtrees\Module\RecentChangesModule;
108use Fisharebest\Webtrees\Module\RelatedIndividualsReportModule;
109use Fisharebest\Webtrees\Module\RelationshipsChartModule;
110use Fisharebest\Webtrees\Module\RelativesTabModule;
111use Fisharebest\Webtrees\Module\ReportsMenuModule;
112use Fisharebest\Webtrees\Module\RepositoryListModule;
113use Fisharebest\Webtrees\Module\ResearchTaskModule;
114use Fisharebest\Webtrees\Module\ReviewChangesModule;
115use Fisharebest\Webtrees\Module\SearchMenuModule;
116use Fisharebest\Webtrees\Module\SiteMapModule;
117use Fisharebest\Webtrees\Module\SlideShowModule;
118use Fisharebest\Webtrees\Module\SourceListModule;
119use Fisharebest\Webtrees\Module\SourcesTabModule;
120use Fisharebest\Webtrees\Module\StatcounterModule;
121use Fisharebest\Webtrees\Module\StatisticsChartModule;
122use Fisharebest\Webtrees\Module\StoriesModule;
123use Fisharebest\Webtrees\Module\ThemeSelectModule;
124use Fisharebest\Webtrees\Module\TimelineChartModule;
125use Fisharebest\Webtrees\Module\TopGivenNamesModule;
126use Fisharebest\Webtrees\Module\TopPageViewsModule;
127use Fisharebest\Webtrees\Module\TopSurnamesModule;
128use Fisharebest\Webtrees\Module\TreesMenuModule;
129use Fisharebest\Webtrees\Module\UpcomingAnniversariesModule;
130use Fisharebest\Webtrees\Module\UserFavoritesModule;
131use Fisharebest\Webtrees\Module\UserJournalModule;
132use Fisharebest\Webtrees\Module\UserMessagesModule;
133use Fisharebest\Webtrees\Module\UserWelcomeModule;
134use Fisharebest\Webtrees\Module\WebtreesTheme;
135use Fisharebest\Webtrees\Module\WelcomeBlockModule;
136use Fisharebest\Webtrees\Module\XeneaTheme;
137use Fisharebest\Webtrees\Module\YahrzeitModule;
138use Fisharebest\Webtrees\Tree;
139use Fisharebest\Webtrees\Webtrees;
140use Illuminate\Database\Capsule\Manager as DB;
141use Illuminate\Support\Collection;
142use Illuminate\Support\Str;
143use stdClass;
144use Throwable;
145
146/**
147 * Functions for managing and maintaining modules.
148 */
149class ModuleService
150{
151    // Components are managed together in the control panel.
152    private const COMPONENTS = [
153        ModuleAnalyticsInterface::class,
154        ModuleBlockInterface::class,
155        ModuleChartInterface::class,
156        ModuleFooterInterface::class,
157        ModuleHistoricEventsInterface::class,
158        ModuleLanguageInterface::class,
159        ModuleListInterface::class,
160        ModuleMenuInterface::class,
161        ModuleReportInterface::class,
162        ModuleSidebarInterface::class,
163        ModuleTabInterface::class,
164        ModuleThemeInterface::class,
165    ];
166
167    // Array keys are module names, and should match module names from earlier versions of webtrees.
168    private const CORE_MODULES = [
169        'GEDFact_assistant'      => CensusAssistantModule::class,
170        'ahnentafel_report'      => AhnentafelReportModule::class,
171        'ancestors_chart'        => AncestorsChartModule::class,
172        'batch_update'           => BatchUpdateModule::class,
173        'bdm_report'             => BirthDeathMarriageReportModule::class,
174        'bing-webmaster-tools'   => BingWebmasterToolsModule::class,
175        'birth_report'           => BirthReportModule::class,
176        'branches_list'          => BranchesListModule::class,
177        'calendar-menu'          => CalendarMenuModule::class,
178        'cemetery_report'        => CemeteryReportModule::class,
179        'change_report'          => ChangeReportModule::class,
180        'charts'                 => ChartsBlockModule::class,
181        'charts-menu'            => ChartsMenuModule::class,
182        'ckeditor'               => CkeditorModule::class,
183        'clippings'              => ClippingsCartModule::class,
184        'clouds'                 => CloudsTheme::class,
185        'colors'                 => ColorsTheme::class,
186        'compact-chart'          => CompactTreeChartModule::class,
187        'contact-links'          => ContactsFooterModule::class,
188        'cookie-warning'         => CookieWarningModule::class,
189        'death_report'           => DeathReportModule::class,
190        'descendancy'            => DescendancyModule::class,
191        'descendancy_chart'      => DescendancyChartModule::class,
192        'descendancy_report'     => DescendancyReportModule::class,
193        'extra_info'             => IndividualMetadataModule::class,
194        'fab'                    => FabTheme::class,
195        'fact_sources'           => FactSourcesReportModule::class,
196        'family_book_chart'      => FamilyBookChartModule::class,
197        'family_group_report'    => FamilyGroupReportModule::class,
198        'family_list'            => FamilyListModule::class,
199        'family_nav'             => FamilyNavigatorModule::class,
200        'fan_chart'              => FanChartModule::class,
201        'faq'                    => FrequentlyAskedQuestionsModule::class,
202        'gedcom_block'           => WelcomeBlockModule::class,
203        'gedcom_favorites'       => FamilyTreeFavoritesModule::class,
204        'gedcom_news'            => FamilyTreeNewsModule::class,
205        'gedcom_stats'           => FamilyTreeStatisticsModule::class,
206        'google-analytics'       => GoogleAnalyticsModule::class,
207        'google-webmaster-tools' => GoogleWebmasterToolsModule::class,
208        'hit-counter'            => HitCountFooterModule::class,
209        'hourglass_chart'        => HourglassChartModule::class,
210        'html'                   => HtmlBlockModule::class,
211        'individual_ext_report'  => IndividualFamiliesReportModule::class,
212        'individual_list'        => IndividualListModule::class,
213        'individual_report'      => IndividualReportModule::class,
214        'lifespans_chart'        => LifespansChartModule::class,
215        'lightbox'               => AlbumModule::class,
216        'lists-menu'             => ListsMenuModule::class,
217        'logged_in'              => LoggedInUsersModule::class,
218        'login_block'            => LoginBlockModule::class,
219        'marriage_report'        => MarriageReportModule::class,
220        'matomo-analytics'       => MatomoAnalyticsModule::class,
221        'media'                  => MediaTabModule::class,
222        'media_list'             => MediaListModule::class,
223        'minimal'                => MinimalTheme::class,
224        'missing_facts_report'   => MissingFactsReportModule::class,
225        'notes'                  => NotesTabModule::class,
226        'note_list'              => NoteListModule::class,
227        'occupation_report'      => OccupationReportModule::class,
228        'pedigree-map'           => PedigreeMapModule::class,
229        'pedigree_chart'         => PedigreeChartModule::class,
230        'pedigree_report'        => PedigreeReportModule::class,
231        'personal_facts'         => IndividualFactsTabModule::class,
232        'places'                 => PlacesModule::class,
233        'places_list'            => PlaceHierarchyListModule::class,
234        'powered-by-webtrees'    => PoweredByWebtreesModule::class,
235        'random_media'           => SlideShowModule::class,
236        'recent_changes'         => RecentChangesModule::class,
237        'relationships_chart'    => RelationshipsChartModule::class,
238        'relative_ext_report'    => RelatedIndividualsReportModule::class,
239        'relatives'              => RelativesTabModule::class,
240        'reports-menu'           => ReportsMenuModule::class,
241        'repository_list'        => RepositoryListModule::class,
242        'review_changes'         => ReviewChangesModule::class,
243        'search-menu'            => SearchMenuModule::class,
244        'sitemap'                => SiteMapModule::class,
245        'source_list'            => SourceListModule::class,
246        'sources_tab'            => SourcesTabModule::class,
247        'statcounter'            => StatcounterModule::class,
248        'statistics_chart'       => StatisticsChartModule::class,
249        'stories'                => StoriesModule::class,
250        'theme_select'           => ThemeSelectModule::class,
251        'timeline_chart'         => TimelineChartModule::class,
252        'todays_events'          => OnThisDayModule::class,
253        'todo'                   => ResearchTaskModule::class,
254        'top10_givnnames'        => TopGivenNamesModule::class,
255        'top10_pageviews'        => TopPageViewsModule::class,
256        'top10_surnames'         => TopSurnamesModule::class,
257        'tree'                   => InteractiveTreeModule::class,
258        'trees-menu'             => TreesMenuModule::class,
259        'upcoming_events'        => UpcomingAnniversariesModule::class,
260        'user_blog'              => UserJournalModule::class,
261        'user_favorites'         => UserFavoritesModule::class,
262        'user_messages'          => UserMessagesModule::class,
263        'user_welcome'           => UserWelcomeModule::class,
264        'webtrees'               => WebtreesTheme::class,
265        'xenea'                  => XeneaTheme::class,
266        'yahrzeit'               => YahrzeitModule::class,
267    ];
268
269    /**
270     * All core modules in the system.
271     *
272     * @return Collection
273     */
274    private function coreModules(): Collection
275    {
276        return Collection::make(self::CORE_MODULES)
277            ->map(function (string $class, string $name): ModuleInterface {
278                $module = app($class);
279
280                $module->setName($name);
281
282                return $module;
283            });
284    }
285
286    /**
287     * All custom modules in the system.  Custom modules are defined in modules_v4/
288     *
289     * @return Collection
290     */
291    private function customModules(): Collection
292    {
293        $pattern   = WT_ROOT . Webtrees::MODULES_PATH . '*/module.php';
294        $filenames = glob($pattern);
295
296        return Collection::make($filenames)
297            ->filter(function (string $filename): bool {
298                // Special characters will break PHP variable names.
299                // This also allows us to ignore modules called "foo.example" and "foo.disable"
300                $module_name = basename(dirname($filename));
301
302                return !Str::contains($module_name, ['.', ' ', '[', ']']) && Str::length($module_name) <= 30;
303            })
304            ->map(function (string $filename): ?ModuleCustomInterface {
305                try {
306                    $module = self::load($filename);
307
308                    if ($module instanceof ModuleCustomInterface) {
309                        $module_name = '_' . basename(dirname($filename)) . '_';
310
311                        $module->setName($module_name);
312                    } else {
313                        return null;
314                    }
315
316                    return $module;
317                } catch (Throwable $ex) {
318                    $message = '<pre>' . e($ex->getMessage()) . "\n" . e($ex->getTraceAsString()) . '</pre>';
319                    FlashMessages::addMessage($message, 'danger');
320
321                    return null;
322                }
323            })
324            ->filter();
325    }
326
327    /**
328     * All modules.
329     *
330     * @return Collection|ModuleInterface[]
331     */
332    public function all(): Collection
333    {
334        return app('cache.array')->rememberForever('all_modules', function (): Collection {
335            // Modules have a default status, order etc.
336            // We can override these from database settings.
337            $module_info = DB::table('module')
338                ->get()
339                ->mapWithKeys(function (stdClass $row): array {
340                    return [$row->module_name => $row];
341                });
342
343            return $this->coreModules()
344                ->merge($this->customModules())
345                ->map(function (ModuleInterface $module) use ($module_info): ModuleInterface {
346                    $info = $module_info->get($module->name());
347
348                    if ($info instanceof stdClass) {
349                        $module->setEnabled($info->status === 'enabled');
350
351                        if ($module instanceof ModuleFooterInterface && $info->footer_order !== null) {
352                            $module->setFooterOrder((int) $info->footer_order);
353                        }
354
355                        if ($module instanceof ModuleMenuInterface && $info->menu_order !== null) {
356                            $module->setMenuOrder((int) $info->menu_order);
357                        }
358
359                        if ($module instanceof ModuleSidebarInterface && $info->sidebar_order !== null) {
360                            $module->setSidebarOrder((int) $info->sidebar_order);
361                        }
362
363                        if ($module instanceof ModuleTabInterface && $info->tab_order !== null) {
364                            $module->setTabOrder((int) $info->tab_order);
365                        }
366                    } else {
367                        $module->setEnabled($module->isEnabledByDefault());
368
369                        DB::table('module')->insert([
370                            'module_name' => $module->name(),
371                            'status'      => $module->isEnabled() ? 'enabled' : 'disabled',
372                        ]);
373                    }
374
375                    return $module;
376                });
377        });
378    }
379
380    /**
381     * Load a module in a static scope, to prevent it from modifying local or object variables.
382     *
383     * @param string $filename
384     *
385     * @return mixed
386     */
387    private static function load(string $filename)
388    {
389        return include $filename;
390    }
391
392    /**
393     * A function to sort modules by name
394     *
395     * @return Closure
396     */
397    private function moduleSorter(): Closure
398    {
399        return function (ModuleInterface $x, ModuleInterface $y): int {
400            return I18N::strcasecmp($x->title(), $y->title());
401        };
402    }
403
404    /**
405     * A function to sort footers
406     *
407     * @return Closure
408     */
409    private function footerSorter(): Closure
410    {
411        return function (ModuleFooterInterface $x, ModuleFooterInterface $y): int {
412            return $x->getFooterOrder() <=> $y->getFooterOrder();
413        };
414    }
415
416    /**
417     * A function to sort menus
418     *
419     * @return Closure
420     */
421    private function menuSorter(): Closure
422    {
423        return function (ModuleMenuInterface $x, ModuleMenuInterface $y): int {
424            return $x->getMenuOrder() <=> $y->getMenuOrder();
425        };
426    }
427
428    /**
429     * A function to sort menus
430     *
431     * @return Closure
432     */
433    private function sidebarSorter(): Closure
434    {
435        return function (ModuleSidebarInterface $x, ModuleSidebarInterface $y): int {
436            return $x->getSidebarOrder() <=> $y->getSidebarOrder();
437        };
438    }
439
440    /**
441     * A function to sort menus
442     *
443     * @return Closure
444     */
445    private function tabSorter(): Closure
446    {
447        return function (ModuleTabInterface $x, ModuleTabInterface $y): int {
448            return $x->getTabOrder() <=> $y->getTabOrder();
449        };
450    }
451
452    /**
453     * A function filter modules by type
454     *
455     * @param string $interface
456     *
457     * @return Closure
458     */
459    private function interfaceFilter(string $interface): Closure
460    {
461        return function (ModuleInterface $module) use ($interface): bool {
462            return $module instanceof $interface;
463        };
464    }
465
466    /**
467     * A function filter modules by enabled/disabled
468     *
469     * @param bool $include_disabled
470     *
471     * @return Closure
472     */
473    private function enabledFilter(bool $include_disabled): Closure
474    {
475        return function (ModuleInterface $module) use ($include_disabled): bool {
476            return $include_disabled || $module->isEnabled();
477        };
478    }
479
480    /**
481     * A function to convert modules into their titles - to create option lists, etc.
482     *
483     * @return Closure
484     */
485    public function titleMapper(): Closure
486    {
487        return function (ModuleInterface $module): string {
488            return $module->title();
489        };
490    }
491
492    /**
493     * Modules which (a) provide a specific function and (b) we have permission to see.
494     *
495     * @param string        $interface
496     * @param Tree          $tree
497     * @param UserInterface $user
498     *
499     * @return Collection|ModuleInterface[]
500     */
501    public function findByComponent(string $interface, Tree $tree, UserInterface $user): Collection
502    {
503        return $this->findByInterface($interface, false, true)
504            ->filter(function (ModuleInterface $module) use ($interface, $tree, $user): bool {
505                return $module->accessLevel($tree, $interface) >= Auth::accessLevel($tree, $user);
506            });
507    }
508
509    /**
510     * All modules which provide a specific function.
511     *
512     * @param string $interface
513     * @param bool   $include_disabled
514     * @param bool   $sort
515     *
516     * @return Collection|ModuleInterface[]
517     */
518    public function findByInterface(string $interface, $include_disabled = false, $sort = false): Collection
519    {
520        $modules = $this->all()
521            ->filter($this->interfaceFilter($interface))
522            ->filter($this->enabledFilter($include_disabled));
523
524        switch ($interface) {
525            case ModuleFooterInterface::class:
526                return $modules->sort($this->footerSorter());
527
528            case ModuleMenuInterface::class:
529                return $modules->sort($this->menuSorter());
530
531            case ModuleSidebarInterface::class:
532                return $modules->sort($this->sidebarSorter());
533
534            case ModuleTabInterface::class:
535                return $modules->sort($this->tabSorter());
536
537            default:
538                if ($sort) {
539                    return $modules->sort($this->moduleSorter());
540                }
541
542                return $modules;
543        }
544    }
545
546    /**
547     * Find a specified module, if it is currently active.
548     *
549     * @param string $module_name
550     * @param bool   $include_disabled
551     *
552     * @return ModuleInterface|null
553     */
554    public function findByName(string $module_name, bool $include_disabled = false): ?ModuleInterface
555    {
556        return $this->all()
557            ->filter($this->enabledFilter($include_disabled))
558            ->filter(function (ModuleInterface $module) use ($module_name): bool {
559                return $module->name() === $module_name;
560            })
561            ->first();
562    }
563
564    /**
565     * Configuration settings are available through the various "module component" pages.
566     * For modules that do not provide a component, we need to list them separately.
567     *
568     * @return Collection|ModuleConfigInterface[]
569     */
570    public function configOnlyModules(): Collection
571    {
572        return $this->findByInterface(ModuleConfigInterface::class)
573            ->filter(function (ModuleConfigInterface $module): bool {
574                foreach (self::COMPONENTS as $interface) {
575                    if ($module instanceof $interface) {
576                        return false;
577                    }
578                }
579
580                return true;
581            });
582    }
583
584    /**
585     * Generate a list of module names which exist in the database but not on disk.
586     *
587     * @return Collection|string[]
588     */
589    public function deletedModules(): Collection
590    {
591        $database_modules = DB::table('module')->pluck('module_name');
592
593        $disk_modules = $this->all()
594            ->map(function (ModuleInterface $module): string {
595                return $module->name();
596            });
597
598        return $database_modules->diff($disk_modules);
599    }
600}
601