537 lines
18 KiB
PHP
537 lines
18 KiB
PHP
<?php namespace BookStack\Entities;
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use BookStack\Auth\Permissions\PermissionService;
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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\Query\Builder;
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use Illuminate\Database\Query\JoinClause;
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use Illuminate\Support\Collection;
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class SearchService
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{
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/**
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* @var SearchTerm
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*/
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protected $searchTerm;
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/**
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* @var EntityProvider
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*/
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protected $entityProvider;
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/**
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* @var Connection
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*/
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protected $db;
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/**
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* @var PermissionService
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*/
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protected $permissionService;
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/**
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* Acceptable operators to be used in a query
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* @var array
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*/
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protected $queryOperators = ['<=', '>=', '=', '<', '>', 'like', '!='];
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/**
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* SearchService constructor.
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* @param SearchTerm $searchTerm
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* @param EntityProvider $entityProvider
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* @param Connection $db
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* @param PermissionService $permissionService
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*/
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public function __construct(SearchTerm $searchTerm, EntityProvider $entityProvider, Connection $db, PermissionService $permissionService)
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{
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$this->searchTerm = $searchTerm;
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$this->entityProvider = $entityProvider;
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$this->db = $db;
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$this->permissionService = $permissionService;
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}
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/**
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* Set the database connection
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* @param Connection $connection
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*/
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public function setConnection(Connection $connection)
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{
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$this->db = $connection;
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}
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/**
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* Search all entities in the system.
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* @param string $searchString
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* @param string $entityType
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* @param int $page
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* @param int $count - Count of each entity to search, Total returned could can be larger and not guaranteed.
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* @param string $action
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* @return array[int, Collection];
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*/
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public function searchEntities($searchString, $entityType = 'all', $page = 1, $count = 20, $action = 'view')
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{
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$terms = $this->parseSearchString($searchString);
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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 = $entityType;
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} else if (isset($terms['filters']['type'])) {
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$entityTypesToSearch = explode('|', $terms['filters']['type']);
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}
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$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, $entityTypes)) {
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continue;
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}
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$search = $this->searchEntityTable($terms, $entityType, $page, $count, $action);
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$entityTotal = $this->searchEntityTable($terms, $entityType, $page, $count, $action, true);
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if ($entityTotal > $page * $count) {
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$hasMore = true;
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}
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$total += $entityTotal;
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$results = $results->merge($search);
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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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* @param integer $bookId
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* @param string $searchString
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* @return Collection
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*/
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public function searchBook($bookId, $searchString)
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{
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$terms = $this->parseSearchString($searchString);
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$entityTypes = ['page', 'chapter'];
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$entityTypesToSearch = isset($terms['filters']['type']) ? explode('|', $terms['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 = $this->buildEntitySearchQuery($terms, $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 book for entities
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* @param integer $chapterId
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* @param string $searchString
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* @return Collection
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*/
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public function searchChapter($chapterId, $searchString)
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{
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$terms = $this->parseSearchString($searchString);
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$pages = $this->buildEntitySearchQuery($terms, '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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* Search across a particular entity type.
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* @param array $terms
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* @param string $entityType
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* @param int $page
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* @param int $count
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* @param string $action
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* @param bool $getCount Return the total count of the search
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* @return \Illuminate\Database\Eloquent\Collection|int|static[]
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*/
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public function searchEntityTable($terms, $entityType = 'page', $page = 1, $count = 20, $action = 'view', $getCount = false)
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{
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$query = $this->buildEntitySearchQuery($terms, $entityType, $action);
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if ($getCount) {
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return $query->count();
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}
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$query = $query->skip(($page-1) * $count)->take($count);
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return $query->get();
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}
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/**
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* Create a search query for an entity
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* @param array $terms
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* @param string $entityType
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* @param string $action
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* @return EloquentBuilder
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*/
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protected function buildEntitySearchQuery($terms, $entityType = 'page', $action = 'view')
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{
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$entity = $this->entityProvider->get($entityType);
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$entitySelect = $entity->newQuery();
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// Handle normal search terms
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if (count($terms['search']) > 0) {
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$subQuery = $this->db->table('search_terms')->select('entity_id', 'entity_type', \DB::raw('SUM(score) as score'));
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$subQuery->where('entity_type', '=', $entity->getMorphClass());
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$subQuery->where(function (Builder $query) use ($terms) {
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foreach ($terms['search'] as $inputTerm) {
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$query->orWhere('term', 'like', $inputTerm .'%');
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}
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})->groupBy('entity_type', 'entity_id');
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$entitySelect->join(\DB::raw('(' . $subQuery->toSql() . ') as s'), function (JoinClause $join) {
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$join->on('id', '=', 'entity_id');
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})->selectRaw($entity->getTable().'.*, s.score')->orderBy('score', 'desc');
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$entitySelect->mergeBindings($subQuery);
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}
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// Handle exact term matching
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if (count($terms['exact']) > 0) {
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$entitySelect->where(function (EloquentBuilder $query) use ($terms, $entity) {
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foreach ($terms['exact'] as $inputTerm) {
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$query->where(function (EloquentBuilder $query) use ($inputTerm, $entity) {
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$query->where('name', 'like', '%'.$inputTerm .'%')
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->orWhere($entity->textField, 'like', '%'.$inputTerm .'%');
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});
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}
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});
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}
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// Handle tag searches
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foreach ($terms['tags'] as $inputTerm) {
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$this->applyTagSearch($entitySelect, $inputTerm);
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}
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// Handle filters
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foreach ($terms['filters'] as $filterTerm => $filterValue) {
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$functionName = camel_case('filter_' . $filterTerm);
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if (method_exists($this, $functionName)) {
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$this->$functionName($entitySelect, $entity, $filterValue);
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}
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}
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return $this->permissionService->enforceEntityRestrictions($entityType, $entitySelect, $action);
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}
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/**
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* Parse a search string into components.
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* @param $searchString
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* @return array
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*/
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protected function parseSearchString($searchString)
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{
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$terms = [
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'search' => [],
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'exact' => [],
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'tags' => [],
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'filters' => []
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];
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$patterns = [
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'exact' => '/"(.*?)"/',
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'tags' => '/\[(.*?)\]/',
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'filters' => '/\{(.*?)\}/'
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];
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// Parse special terms
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foreach ($patterns as $termType => $pattern) {
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$matches = [];
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preg_match_all($pattern, $searchString, $matches);
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if (count($matches) > 0) {
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$terms[$termType] = $matches[1];
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$searchString = preg_replace($pattern, '', $searchString);
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}
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}
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// Parse standard terms
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foreach (explode(' ', trim($searchString)) as $searchTerm) {
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if ($searchTerm !== '') {
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$terms['search'][] = $searchTerm;
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}
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}
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// Split filter values out
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$splitFilters = [];
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foreach ($terms['filters'] as $filter) {
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$explodedFilter = explode(':', $filter, 2);
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$splitFilters[$explodedFilter[0]] = (count($explodedFilter) > 1) ? $explodedFilter[1] : '';
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}
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$terms['filters'] = $splitFilters;
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return $terms;
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}
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/**
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* Get the available query operators as a regex escaped list.
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* @return mixed
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*/
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protected function getRegexEscapedOperators()
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{
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$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 join('|', $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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* @param EloquentBuilder $query
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* @param string $tagTerm
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* @return mixed
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*/
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protected function applyTagSearch(EloquentBuilder $query, $tagTerm)
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{
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preg_match("/^(.*?)((".$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) && $tagOperator !== 'like') {
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// We have to do a raw sql query for this since otherwise PDO will quote the value and MySQL will
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// search the value as a string which prevents being able to do number-based operations
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// on the tag values. We ensure it has a numeric value and then cast it just to be sure.
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$tagValue = (float) trim($query->getConnection()->getPdo()->quote($tagValue), "'");
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$query->whereRaw("value ${tagOperator} ${tagValue}");
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} else {
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$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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* Index the given entity.
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* @param Entity $entity
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*/
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public function indexEntity(Entity $entity)
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{
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$this->deleteEntityTerms($entity);
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$nameTerms = $this->generateTermArrayFromText($entity->name, 5 * $entity->searchFactor);
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$bodyTerms = $this->generateTermArrayFromText($entity->getText(), 1 * $entity->searchFactor);
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$terms = array_merge($nameTerms, $bodyTerms);
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foreach ($terms as $index => $term) {
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$terms[$index]['entity_type'] = $entity->getMorphClass();
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$terms[$index]['entity_id'] = $entity->id;
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}
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$this->searchTerm->newQuery()->insert($terms);
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}
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/**
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* Index multiple Entities at once
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* @param \BookStack\Entities\Entity[] $entities
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*/
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protected function indexEntities($entities)
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{
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$terms = [];
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foreach ($entities as $entity) {
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$nameTerms = $this->generateTermArrayFromText($entity->name, 5 * $entity->searchFactor);
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$bodyTerms = $this->generateTermArrayFromText($entity->getText(), 1 * $entity->searchFactor);
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foreach (array_merge($nameTerms, $bodyTerms) as $term) {
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$term['entity_id'] = $entity->id;
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$term['entity_type'] = $entity->getMorphClass();
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$terms[] = $term;
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}
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}
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$chunkedTerms = array_chunk($terms, 500);
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foreach ($chunkedTerms as $termChunk) {
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$this->searchTerm->newQuery()->insert($termChunk);
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}
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}
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/**
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* Delete and re-index the terms for all entities in the system.
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*/
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public function indexAllEntities()
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{
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$this->searchTerm->truncate();
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foreach ($this->entityProvider->all() as $entityModel) {
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$selectFields = ['id', 'name', $entityModel->textField];
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$entityModel->newQuery()->select($selectFields)->chunk(1000, function ($entities) {
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$this->indexEntities($entities);
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});
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}
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}
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/**
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* Delete related Entity search terms.
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* @param Entity $entity
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*/
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public function deleteEntityTerms(Entity $entity)
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{
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$entity->searchTerms()->delete();
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}
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/**
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* Create a scored term array from the given text.
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* @param $text
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* @param float|int $scoreAdjustment
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* @return array
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*/
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protected function generateTermArrayFromText($text, $scoreAdjustment = 1)
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{
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$tokenMap = []; // {TextToken => OccurrenceCount}
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$splitChars = " \n\t.,!?:;()[]{}<>`'\"";
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$token = strtok($text, $splitChars);
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while ($token !== false) {
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if (!isset($tokenMap[$token])) {
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$tokenMap[$token] = 0;
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}
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$tokenMap[$token]++;
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$token = strtok($splitChars);
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}
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$terms = [];
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foreach ($tokenMap as $token => $count) {
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$terms[] = [
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'term' => $token,
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'score' => $count * $scoreAdjustment
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];
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}
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return $terms;
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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, $input)
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{
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try {
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$date = date_create($input);
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} catch (\Exception $e) {
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return;
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}
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$query->where('updated_at', '>=', $date);
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}
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protected function filterUpdatedBefore(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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} catch (\Exception $e) {
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return;
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}
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$query->where('updated_at', '<', $date);
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}
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protected function filterCreatedAfter(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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} catch (\Exception $e) {
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return;
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}
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$query->where('created_at', '>=', $date);
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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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} catch (\Exception $e) {
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return;
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}
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$query->where('created_at', '<', $date);
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}
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protected function filterCreatedBy(EloquentBuilder $query, Entity $model, $input)
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{
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if (!is_numeric($input) && $input !== 'me') {
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return;
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}
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if ($input === 'me') {
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$input = user()->id;
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}
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$query->where('created_by', '=', $input);
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}
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protected function filterUpdatedBy(EloquentBuilder $query, Entity $model, $input)
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{
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if (!is_numeric($input) && $input !== 'me') {
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return;
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}
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if ($input === 'me') {
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$input = user()->id;
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}
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$query->where('updated_by', '=', $input);
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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->where('restricted', '=', true);
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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 filterSortBy(EloquentBuilder $query, Entity $model, $input)
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{
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$functionName = camel_case('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 = $this->db->getTablePrefix() . 'comments';
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$morphClass = str_replace('\\', '\\\\', $model->getMorphClass());
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$commentQuery = $this->db->raw('(SELECT c1.entity_id, c1.entity_type, c1.created_at as last_commented FROM '.$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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