489 lines
17 KiB
PHP
489 lines
17 KiB
PHP
<?php
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namespace BookStack\Search;
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use BookStack\Entities\EntityProvider;
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use BookStack\Entities\Models\Entity;
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use BookStack\Entities\Models\Page;
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use BookStack\Entities\Queries\EntityQueries;
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use BookStack\Permissions\PermissionApplicator;
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use BookStack\Users\Models\User;
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use Illuminate\Database\Connection;
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use Illuminate\Database\Eloquent\Builder as EloquentBuilder;
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use Illuminate\Database\Eloquent\Collection as EloquentCollection;
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use Illuminate\Database\Eloquent\Relations\BelongsTo;
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use Illuminate\Database\Query\Builder;
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use Illuminate\Support\Collection;
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use Illuminate\Support\Facades\DB;
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use Illuminate\Support\Str;
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use SplObjectStorage;
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class SearchRunner
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{
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/**
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* Acceptable operators to be used in a query.
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*
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* @var string[]
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*/
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protected array $queryOperators = ['<=', '>=', '=', '<', '>', 'like', '!='];
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/**
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* Retain a cache of score adjusted terms for specific search options.
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* From PHP>=8 this can be made into a WeakMap instead.
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*
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* @var SplObjectStorage
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*/
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protected $termAdjustmentCache;
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public function __construct(
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protected EntityProvider $entityProvider,
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protected PermissionApplicator $permissions,
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protected EntityQueries $entityQueries,
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) {
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$this->termAdjustmentCache = new SplObjectStorage();
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}
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/**
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* Search all entities in the system.
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* The provided count is for each entity to search,
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* Total returned could be larger and not guaranteed.
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*
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* @return array{total: int, count: int, has_more: bool, results: Collection<Entity>}
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*/
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public function searchEntities(SearchOptions $searchOpts, string $entityType = 'all', int $page = 1, int $count = 20): array
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{
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$entityTypes = array_keys($this->entityProvider->all());
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$entityTypesToSearch = $entityTypes;
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if ($entityType !== 'all') {
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$entityTypesToSearch = [$entityType];
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} elseif (isset($searchOpts->filters['type'])) {
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$entityTypesToSearch = explode('|', $searchOpts->filters['type']);
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}
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$results = collect();
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$total = 0;
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$hasMore = false;
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foreach ($entityTypesToSearch as $entityType) {
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if (!in_array($entityType, $entityTypes)) {
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continue;
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}
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$searchQuery = $this->buildQuery($searchOpts, $entityType);
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$entityTotal = $searchQuery->count();
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$searchResults = $this->getPageOfDataFromQuery($searchQuery, $entityType, $page, $count);
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if ($entityTotal > ($page * $count)) {
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$hasMore = true;
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}
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$total += $entityTotal;
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$results = $results->merge($searchResults);
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}
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return [
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'total' => $total,
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'count' => count($results),
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'has_more' => $hasMore,
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'results' => $results->sortByDesc('score')->values(),
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];
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}
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/**
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* Search a book for entities.
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*/
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public function searchBook(int $bookId, string $searchString): Collection
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{
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$opts = SearchOptions::fromString($searchString);
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$entityTypes = ['page', 'chapter'];
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$entityTypesToSearch = isset($opts->filters['type']) ? explode('|', $opts->filters['type']) : $entityTypes;
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$results = collect();
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foreach ($entityTypesToSearch as $entityType) {
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if (!in_array($entityType, $entityTypes)) {
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continue;
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}
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$search = $this->buildQuery($opts, $entityType)->where('book_id', '=', $bookId)->take(20)->get();
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$results = $results->merge($search);
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}
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return $results->sortByDesc('score')->take(20);
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}
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/**
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* Search a chapter for entities.
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*/
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public function searchChapter(int $chapterId, string $searchString): Collection
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{
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$opts = SearchOptions::fromString($searchString);
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$pages = $this->buildQuery($opts, 'page')->where('chapter_id', '=', $chapterId)->take(20)->get();
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return $pages->sortByDesc('score');
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}
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/**
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* Get a page of result data from the given query based on the provided page parameters.
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*/
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protected function getPageOfDataFromQuery(EloquentBuilder $query, string $entityType, int $page = 1, int $count = 20): EloquentCollection
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{
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$relations = ['tags'];
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if ($entityType === 'page' || $entityType === 'chapter') {
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$relations['book'] = function (BelongsTo $query) {
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$query->scopes('visible');
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};
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}
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if ($entityType === 'page') {
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$relations['chapter'] = function (BelongsTo $query) {
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$query->scopes('visible');
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};
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}
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return $query->clone()
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->with(array_filter($relations))
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->skip(($page - 1) * $count)
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->take($count)
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->get();
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}
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/**
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* Create a search query for an entity.
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*/
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protected function buildQuery(SearchOptions $searchOpts, string $entityType): EloquentBuilder
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{
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$entityModelInstance = $this->entityProvider->get($entityType);
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$entityQuery = $this->entityQueries->visibleForList($entityType);
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// Handle normal search terms
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$this->applyTermSearch($entityQuery, $searchOpts, $entityType);
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// Handle exact term matching
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foreach ($searchOpts->exacts as $inputTerm) {
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$entityQuery->where(function (EloquentBuilder $query) use ($inputTerm, $entityModelInstance) {
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$inputTerm = str_replace('\\', '\\\\', $inputTerm);
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$query->where('name', 'like', '%' . $inputTerm . '%')
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->orWhere($entityModelInstance->textField, 'like', '%' . $inputTerm . '%');
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});
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}
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// Handle tag searches
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foreach ($searchOpts->tags as $inputTerm) {
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$this->applyTagSearch($entityQuery, $inputTerm);
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}
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// Handle filters
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foreach ($searchOpts->filters as $filterTerm => $filterValue) {
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$functionName = Str::camel('filter_' . $filterTerm);
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if (method_exists($this, $functionName)) {
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$this->$functionName($entityQuery, $entityModelInstance, $filterValue);
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}
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}
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return $entityQuery;
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}
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/**
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* For the given search query, apply the queries for handling the regular search terms.
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*/
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protected function applyTermSearch(EloquentBuilder $entityQuery, SearchOptions $options, string $entityType): void
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{
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$terms = $options->searches;
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if (count($terms) === 0) {
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return;
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}
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$scoredTerms = $this->getTermAdjustments($options);
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$scoreSelect = $this->selectForScoredTerms($scoredTerms);
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$subQuery = DB::table('search_terms')->select([
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'entity_id',
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'entity_type',
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DB::raw($scoreSelect['statement']),
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]);
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$subQuery->addBinding($scoreSelect['bindings'], 'select');
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$subQuery->where('entity_type', '=', $entityType);
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$subQuery->where(function (Builder $query) use ($terms) {
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foreach ($terms as $inputTerm) {
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$inputTerm = str_replace('\\', '\\\\', $inputTerm);
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$query->orWhere('term', 'like', $inputTerm . '%');
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}
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});
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$subQuery->groupBy('entity_type', 'entity_id');
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$entityQuery->joinSub($subQuery, 's', 'id', '=', 'entity_id');
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$entityQuery->addSelect('s.score');
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$entityQuery->orderBy('score', 'desc');
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}
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/**
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* Create a select statement, with prepared bindings, for the given
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* set of scored search terms.
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*
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* @param array<string, float> $scoredTerms
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*
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* @return array{statement: string, bindings: string[]}
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*/
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protected function selectForScoredTerms(array $scoredTerms): array
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{
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// Within this we walk backwards to create the chain of 'if' statements
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// so that each previous statement is used in the 'else' condition of
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// the next (earlier) to be built. We start at '0' to have no score
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// on no match (Should never actually get to this case).
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$ifChain = '0';
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$bindings = [];
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foreach ($scoredTerms as $term => $score) {
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$ifChain = 'IF(term like ?, score * ' . (float) $score . ', ' . $ifChain . ')';
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$bindings[] = $term . '%';
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}
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return [
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'statement' => 'SUM(' . $ifChain . ') as score',
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'bindings' => array_reverse($bindings),
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];
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}
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/**
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* For the terms in the given search options, query their popularity across all
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* search terms then provide that back as score adjustment multiplier applicable
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* for their rarity. Returns an array of float multipliers, keyed by term.
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*
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* @return array<string, float>
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*/
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protected function getTermAdjustments(SearchOptions $options): array
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{
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if (isset($this->termAdjustmentCache[$options])) {
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return $this->termAdjustmentCache[$options];
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}
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$termQuery = SearchTerm::query()->toBase();
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$whenStatements = [];
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$whenBindings = [];
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foreach ($options->searches as $term) {
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$whenStatements[] = 'WHEN term LIKE ? THEN ?';
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$whenBindings[] = $term . '%';
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$whenBindings[] = $term;
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$termQuery->orWhere('term', 'like', $term . '%');
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}
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$case = 'CASE ' . implode(' ', $whenStatements) . ' END';
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$termQuery->selectRaw($case . ' as term', $whenBindings);
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$termQuery->selectRaw('COUNT(*) as count');
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$termQuery->groupByRaw($case, $whenBindings);
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$termCounts = $termQuery->pluck('count', 'term')->toArray();
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$adjusted = $this->rawTermCountsToAdjustments($termCounts);
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$this->termAdjustmentCache[$options] = $adjusted;
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return $this->termAdjustmentCache[$options];
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}
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/**
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* Convert counts of terms into a relative-count normalised multiplier.
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*
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* @param array<string, int> $termCounts
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*
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* @return array<string, int>
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*/
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protected function rawTermCountsToAdjustments(array $termCounts): array
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{
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if (empty($termCounts)) {
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return [];
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}
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$multipliers = [];
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$max = max(array_values($termCounts));
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foreach ($termCounts as $term => $count) {
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$percent = round($count / $max, 5);
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$multipliers[$term] = 1.3 - $percent;
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}
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return $multipliers;
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}
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/**
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* Get the available query operators as a regex escaped list.
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*/
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protected function getRegexEscapedOperators(): string
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{
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$escapedOperators = [];
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foreach ($this->queryOperators as $operator) {
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$escapedOperators[] = preg_quote($operator);
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}
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return implode('|', $escapedOperators);
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}
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/**
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* Apply a tag search term onto a entity query.
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*/
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protected function applyTagSearch(EloquentBuilder $query, string $tagTerm): EloquentBuilder
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{
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preg_match('/^(.*?)((' . $this->getRegexEscapedOperators() . ')(.*?))?$/', $tagTerm, $tagSplit);
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$query->whereHas('tags', function (EloquentBuilder $query) use ($tagSplit) {
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$tagName = $tagSplit[1];
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$tagOperator = count($tagSplit) > 2 ? $tagSplit[3] : '';
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$tagValue = count($tagSplit) > 3 ? $tagSplit[4] : '';
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$validOperator = in_array($tagOperator, $this->queryOperators);
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if (!empty($tagOperator) && !empty($tagValue) && $validOperator) {
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if (!empty($tagName)) {
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$query->where('name', '=', $tagName);
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}
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if (is_numeric($tagValue) && $tagOperator !== 'like') {
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// We have to do a raw sql query for this since otherwise PDO will quote the value and MySQL will
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// search the value as a string which prevents being able to do number-based operations
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// on the tag values. We ensure it has a numeric value and then cast it just to be sure.
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/** @var Connection $connection */
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$connection = $query->getConnection();
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$tagValue = (float) trim($connection->getPdo()->quote($tagValue), "'");
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$query->whereRaw("value {$tagOperator} {$tagValue}");
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} else {
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if ($tagOperator === 'like') {
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$tagValue = str_replace('\\', '\\\\', $tagValue);
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}
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$query->where('value', $tagOperator, $tagValue);
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}
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} else {
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$query->where('name', '=', $tagName);
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}
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});
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return $query;
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}
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/**
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* Custom entity search filters.
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*/
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protected function filterUpdatedAfter(EloquentBuilder $query, Entity $model, $input): void
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{
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try {
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$date = date_create($input);
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$query->where('updated_at', '>=', $date);
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} catch (\Exception $e) {
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}
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}
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protected function filterUpdatedBefore(EloquentBuilder $query, Entity $model, $input): void
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{
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try {
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$date = date_create($input);
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$query->where('updated_at', '<', $date);
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} catch (\Exception $e) {
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}
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}
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protected function filterCreatedAfter(EloquentBuilder $query, Entity $model, $input): void
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{
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try {
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$date = date_create($input);
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$query->where('created_at', '>=', $date);
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} catch (\Exception $e) {
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}
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}
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protected function filterCreatedBefore(EloquentBuilder $query, Entity $model, $input)
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{
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try {
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$date = date_create($input);
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$query->where('created_at', '<', $date);
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} catch (\Exception $e) {
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}
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}
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protected function filterCreatedBy(EloquentBuilder $query, Entity $model, $input)
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{
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$userSlug = $input === 'me' ? user()->slug : trim($input);
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$user = User::query()->where('slug', '=', $userSlug)->first(['id']);
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if ($user) {
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$query->where('created_by', '=', $user->id);
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}
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}
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protected function filterUpdatedBy(EloquentBuilder $query, Entity $model, $input)
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{
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$userSlug = $input === 'me' ? user()->slug : trim($input);
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$user = User::query()->where('slug', '=', $userSlug)->first(['id']);
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if ($user) {
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$query->where('updated_by', '=', $user->id);
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}
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}
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protected function filterOwnedBy(EloquentBuilder $query, Entity $model, $input)
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{
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$userSlug = $input === 'me' ? user()->slug : trim($input);
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$user = User::query()->where('slug', '=', $userSlug)->first(['id']);
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if ($user) {
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$query->where('owned_by', '=', $user->id);
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}
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}
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protected function filterInName(EloquentBuilder $query, Entity $model, $input)
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{
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$query->where('name', 'like', '%' . $input . '%');
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}
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protected function filterInTitle(EloquentBuilder $query, Entity $model, $input)
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{
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$this->filterInName($query, $model, $input);
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}
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protected function filterInBody(EloquentBuilder $query, Entity $model, $input)
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{
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$query->where($model->textField, 'like', '%' . $input . '%');
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}
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protected function filterIsRestricted(EloquentBuilder $query, Entity $model, $input)
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{
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$query->whereHas('permissions');
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}
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protected function filterViewedByMe(EloquentBuilder $query, Entity $model, $input)
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{
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$query->whereHas('views', function ($query) {
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$query->where('user_id', '=', user()->id);
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});
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}
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protected function filterNotViewedByMe(EloquentBuilder $query, Entity $model, $input)
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{
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$query->whereDoesntHave('views', function ($query) {
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$query->where('user_id', '=', user()->id);
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});
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}
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protected function filterIsTemplate(EloquentBuilder $query, Entity $model, $input)
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{
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if ($model instanceof Page) {
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$query->where('template', '=', true);
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}
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}
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protected function filterSortBy(EloquentBuilder $query, Entity $model, $input)
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{
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$functionName = Str::camel('sort_by_' . $input);
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if (method_exists($this, $functionName)) {
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$this->$functionName($query, $model);
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}
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}
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/**
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* Sorting filter options.
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*/
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protected function sortByLastCommented(EloquentBuilder $query, Entity $model)
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{
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$commentsTable = DB::getTablePrefix() . 'comments';
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$morphClass = str_replace('\\', '\\\\', $model->getMorphClass());
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$commentQuery = DB::raw('(SELECT c1.entity_id, c1.entity_type, c1.created_at as last_commented FROM ' . $commentsTable . ' c1 LEFT JOIN ' . $commentsTable . ' c2 ON (c1.entity_id = c2.entity_id AND c1.entity_type = c2.entity_type AND c1.created_at < c2.created_at) WHERE c1.entity_type = \'' . $morphClass . '\' AND c2.created_at IS NULL) as comments');
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$query->join($commentQuery, $model->getTable() . '.id', '=', 'comments.entity_id')->orderBy('last_commented', 'desc');
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}
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}
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