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BookStack/app/Entities/SearchService.php

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<?php namespace BookStack\Entities;
use BookStack\Auth\Permissions\PermissionService;
use Illuminate\Database\Connection;
use Illuminate\Database\Eloquent\Builder as EloquentBuilder;
use Illuminate\Database\Query\Builder;
use Illuminate\Database\Query\JoinClause;
use Illuminate\Support\Collection;
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use Illuminate\Support\Str;
class SearchService
{
/**
* @var SearchTerm
*/
protected $searchTerm;
/**
* @var EntityProvider
*/
protected $entityProvider;
/**
* @var Connection
*/
protected $db;
/**
* @var PermissionService
*/
protected $permissionService;
/**
* Acceptable operators to be used in a query
* @var array
*/
protected $queryOperators = ['<=', '>=', '=', '<', '>', 'like', '!='];
/**
* SearchService constructor.
* @param SearchTerm $searchTerm
* @param EntityProvider $entityProvider
* @param Connection $db
* @param PermissionService $permissionService
*/
public function __construct(SearchTerm $searchTerm, EntityProvider $entityProvider, Connection $db, PermissionService $permissionService)
{
$this->searchTerm = $searchTerm;
$this->entityProvider = $entityProvider;
$this->db = $db;
$this->permissionService = $permissionService;
}
/**
* Set the database connection
* @param Connection $connection
*/
public function setConnection(Connection $connection)
{
$this->db = $connection;
}
/**
* Search all entities in the system.
* @param string $searchString
* @param string $entityType
* @param int $page
* @param int $count - Count of each entity to search, Total returned could can be larger and not guaranteed.
* @param string $action
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* @return array[int, Collection];
*/
public function searchEntities($searchString, $entityType = 'all', $page = 1, $count = 20, $action = 'view')
{
$terms = $this->parseSearchString($searchString);
$entityTypes = array_keys($this->entityProvider->all());
$entityTypesToSearch = $entityTypes;
if ($entityType !== 'all') {
$entityTypesToSearch = $entityType;
} else if (isset($terms['filters']['type'])) {
$entityTypesToSearch = explode('|', $terms['filters']['type']);
}
$results = collect();
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$total = 0;
$hasMore = false;
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foreach ($entityTypesToSearch as $entityType) {
if (!in_array($entityType, $entityTypes)) {
continue;
}
$search = $this->searchEntityTable($terms, $entityType, $page, $count, $action);
$entityTotal = $this->searchEntityTable($terms, $entityType, $page, $count, $action, true);
if ($entityTotal > $page * $count) {
$hasMore = true;
}
$total += $entityTotal;
$results = $results->merge($search);
}
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return [
'total' => $total,
'count' => count($results),
'has_more' => $hasMore,
'results' => $results->sortByDesc('score')->values()
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];
}
/**
* Search a book for entities
* @param integer $bookId
* @param string $searchString
* @return Collection
*/
public function searchBook($bookId, $searchString)
{
$terms = $this->parseSearchString($searchString);
$entityTypes = ['page', 'chapter'];
$entityTypesToSearch = isset($terms['filters']['type']) ? explode('|', $terms['filters']['type']) : $entityTypes;
$results = collect();
foreach ($entityTypesToSearch as $entityType) {
if (!in_array($entityType, $entityTypes)) {
continue;
}
$search = $this->buildEntitySearchQuery($terms, $entityType)->where('book_id', '=', $bookId)->take(20)->get();
$results = $results->merge($search);
}
return $results->sortByDesc('score')->take(20);
}
/**
* Search a book for entities
* @param integer $chapterId
* @param string $searchString
* @return Collection
*/
public function searchChapter($chapterId, $searchString)
{
$terms = $this->parseSearchString($searchString);
$pages = $this->buildEntitySearchQuery($terms, 'page')->where('chapter_id', '=', $chapterId)->take(20)->get();
return $pages->sortByDesc('score');
}
/**
* Search across a particular entity type.
* @param array $terms
* @param string $entityType
* @param int $page
* @param int $count
* @param string $action
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* @param bool $getCount Return the total count of the search
* @return \Illuminate\Database\Eloquent\Collection|int|static[]
*/
public function searchEntityTable($terms, $entityType = 'page', $page = 1, $count = 20, $action = 'view', $getCount = false)
{
$query = $this->buildEntitySearchQuery($terms, $entityType, $action);
if ($getCount) {
return $query->count();
}
$query = $query->skip(($page-1) * $count)->take($count);
return $query->get();
}
/**
* Create a search query for an entity
* @param array $terms
* @param string $entityType
* @param string $action
* @return EloquentBuilder
*/
protected function buildEntitySearchQuery($terms, $entityType = 'page', $action = 'view')
{
$entity = $this->entityProvider->get($entityType);
$entitySelect = $entity->newQuery();
// Handle normal search terms
if (count($terms['search']) > 0) {
$subQuery = $this->db->table('search_terms')->select('entity_id', 'entity_type', \DB::raw('SUM(score) as score'));
$subQuery->where('entity_type', '=', $entity->getMorphClass());
$subQuery->where(function (Builder $query) use ($terms) {
foreach ($terms['search'] as $inputTerm) {
$query->orWhere('term', 'like', $inputTerm .'%');
}
})->groupBy('entity_type', 'entity_id');
$entitySelect->join(\DB::raw('(' . $subQuery->toSql() . ') as s'), function (JoinClause $join) {
$join->on('id', '=', 'entity_id');
})->selectRaw($entity->getTable().'.*, s.score')->orderBy('score', 'desc');
$entitySelect->mergeBindings($subQuery);
}
// Handle exact term matching
if (count($terms['exact']) > 0) {
$entitySelect->where(function (EloquentBuilder $query) use ($terms, $entity) {
foreach ($terms['exact'] as $inputTerm) {
$query->where(function (EloquentBuilder $query) use ($inputTerm, $entity) {
$query->where('name', 'like', '%'.$inputTerm .'%')
->orWhere($entity->textField, 'like', '%'.$inputTerm .'%');
});
}
});
}
// Handle tag searches
foreach ($terms['tags'] as $inputTerm) {
$this->applyTagSearch($entitySelect, $inputTerm);
}
// Handle filters
foreach ($terms['filters'] as $filterTerm => $filterValue) {
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$functionName = Str::camel('filter_' . $filterTerm);
if (method_exists($this, $functionName)) {
$this->$functionName($entitySelect, $entity, $filterValue);
}
}
return $this->permissionService->enforceEntityRestrictions($entityType, $entitySelect, $action);
}
/**
* Parse a search string into components.
* @param $searchString
* @return array
*/
protected function parseSearchString($searchString)
{
$terms = [
'search' => [],
'exact' => [],
'tags' => [],
'filters' => []
];
$patterns = [
'exact' => '/"(.*?)"/',
'tags' => '/\[(.*?)\]/',
'filters' => '/\{(.*?)\}/'
];
// Parse special terms
foreach ($patterns as $termType => $pattern) {
$matches = [];
preg_match_all($pattern, $searchString, $matches);
if (count($matches) > 0) {
$terms[$termType] = $matches[1];
$searchString = preg_replace($pattern, '', $searchString);
}
}
// Parse standard terms
foreach (explode(' ', trim($searchString)) as $searchTerm) {
if ($searchTerm !== '') {
$terms['search'][] = $searchTerm;
}
}
// Split filter values out
$splitFilters = [];
foreach ($terms['filters'] as $filter) {
$explodedFilter = explode(':', $filter, 2);
$splitFilters[$explodedFilter[0]] = (count($explodedFilter) > 1) ? $explodedFilter[1] : '';
}
$terms['filters'] = $splitFilters;
return $terms;
}
/**
* Get the available query operators as a regex escaped list.
* @return mixed
*/
protected function getRegexEscapedOperators()
{
$escapedOperators = [];
foreach ($this->queryOperators as $operator) {
$escapedOperators[] = preg_quote($operator);
}
return join('|', $escapedOperators);
}
/**
* Apply a tag search term onto a entity query.
* @param EloquentBuilder $query
* @param string $tagTerm
* @return mixed
*/
protected function applyTagSearch(EloquentBuilder $query, $tagTerm)
{
preg_match("/^(.*?)((".$this->getRegexEscapedOperators().")(.*?))?$/", $tagTerm, $tagSplit);
$query->whereHas('tags', function (EloquentBuilder $query) use ($tagSplit) {
$tagName = $tagSplit[1];
$tagOperator = count($tagSplit) > 2 ? $tagSplit[3] : '';
$tagValue = count($tagSplit) > 3 ? $tagSplit[4] : '';
$validOperator = in_array($tagOperator, $this->queryOperators);
if (!empty($tagOperator) && !empty($tagValue) && $validOperator) {
if (!empty($tagName)) {
$query->where('name', '=', $tagName);
}
if (is_numeric($tagValue) && $tagOperator !== 'like') {
// We have to do a raw sql query for this since otherwise PDO will quote the value and MySQL will
// search the value as a string which prevents being able to do number-based operations
// on the tag values. We ensure it has a numeric value and then cast it just to be sure.
$tagValue = (float) trim($query->getConnection()->getPdo()->quote($tagValue), "'");
$query->whereRaw("value ${tagOperator} ${tagValue}");
} else {
$query->where('value', $tagOperator, $tagValue);
}
} else {
$query->where('name', '=', $tagName);
}
});
return $query;
}
/**
* Index the given entity.
* @param Entity $entity
*/
public function indexEntity(Entity $entity)
{
$this->deleteEntityTerms($entity);
$nameTerms = $this->generateTermArrayFromText($entity->name, 5 * $entity->searchFactor);
$bodyTerms = $this->generateTermArrayFromText($entity->getText(), 1 * $entity->searchFactor);
$terms = array_merge($nameTerms, $bodyTerms);
foreach ($terms as $index => $term) {
$terms[$index]['entity_type'] = $entity->getMorphClass();
$terms[$index]['entity_id'] = $entity->id;
}
$this->searchTerm->newQuery()->insert($terms);
}
/**
* Index multiple Entities at once
* @param \BookStack\Entities\Entity[] $entities
*/
protected function indexEntities($entities)
{
$terms = [];
foreach ($entities as $entity) {
$nameTerms = $this->generateTermArrayFromText($entity->name, 5 * $entity->searchFactor);
$bodyTerms = $this->generateTermArrayFromText($entity->getText(), 1 * $entity->searchFactor);
foreach (array_merge($nameTerms, $bodyTerms) as $term) {
$term['entity_id'] = $entity->id;
$term['entity_type'] = $entity->getMorphClass();
$terms[] = $term;
}
}
$chunkedTerms = array_chunk($terms, 500);
foreach ($chunkedTerms as $termChunk) {
$this->searchTerm->newQuery()->insert($termChunk);
}
}
/**
* Delete and re-index the terms for all entities in the system.
*/
public function indexAllEntities()
{
$this->searchTerm->truncate();
foreach ($this->entityProvider->all() as $entityModel) {
$selectFields = ['id', 'name', $entityModel->textField];
$entityModel->newQuery()->select($selectFields)->chunk(1000, function ($entities) {
$this->indexEntities($entities);
});
}
}
/**
* Delete related Entity search terms.
* @param Entity $entity
*/
public function deleteEntityTerms(Entity $entity)
{
$entity->searchTerms()->delete();
}
/**
* Create a scored term array from the given text.
* @param $text
* @param float|int $scoreAdjustment
* @return array
*/
protected function generateTermArrayFromText($text, $scoreAdjustment = 1)
{
$tokenMap = []; // {TextToken => OccurrenceCount}
$splitChars = " \n\t.,!?:;()[]{}<>`'\"";
$token = strtok($text, $splitChars);
while ($token !== false) {
if (!isset($tokenMap[$token])) {
$tokenMap[$token] = 0;
}
$tokenMap[$token]++;
$token = strtok($splitChars);
}
$terms = [];
foreach ($tokenMap as $token => $count) {
$terms[] = [
'term' => $token,
'score' => $count * $scoreAdjustment
];
}
return $terms;
}
/**
* Custom entity search filters
*/
protected function filterUpdatedAfter(EloquentBuilder $query, Entity $model, $input)
{
try {
$date = date_create($input);
} catch (\Exception $e) {
return;
}
$query->where('updated_at', '>=', $date);
}
protected function filterUpdatedBefore(EloquentBuilder $query, Entity $model, $input)
{
try {
$date = date_create($input);
} catch (\Exception $e) {
return;
}
$query->where('updated_at', '<', $date);
}
protected function filterCreatedAfter(EloquentBuilder $query, Entity $model, $input)
{
try {
$date = date_create($input);
} catch (\Exception $e) {
return;
}
$query->where('created_at', '>=', $date);
}
protected function filterCreatedBefore(EloquentBuilder $query, Entity $model, $input)
{
try {
$date = date_create($input);
} catch (\Exception $e) {
return;
}
$query->where('created_at', '<', $date);
}
protected function filterCreatedBy(EloquentBuilder $query, Entity $model, $input)
{
if (!is_numeric($input) && $input !== 'me') {
return;
}
if ($input === 'me') {
$input = user()->id;
}
$query->where('created_by', '=', $input);
}
protected function filterUpdatedBy(EloquentBuilder $query, Entity $model, $input)
{
if (!is_numeric($input) && $input !== 'me') {
return;
}
if ($input === 'me') {
$input = user()->id;
}
$query->where('updated_by', '=', $input);
}
protected function filterInName(EloquentBuilder $query, Entity $model, $input)
{
$query->where('name', 'like', '%' .$input. '%');
}
protected function filterInTitle(EloquentBuilder $query, Entity $model, $input)
{
$this->filterInName($query, $model, $input);
}
protected function filterInBody(EloquentBuilder $query, Entity $model, $input)
{
$query->where($model->textField, 'like', '%' .$input. '%');
}
protected function filterIsRestricted(EloquentBuilder $query, Entity $model, $input)
{
$query->where('restricted', '=', true);
}
protected function filterViewedByMe(EloquentBuilder $query, Entity $model, $input)
{
$query->whereHas('views', function ($query) {
$query->where('user_id', '=', user()->id);
});
}
protected function filterNotViewedByMe(EloquentBuilder $query, Entity $model, $input)
{
$query->whereDoesntHave('views', function ($query) {
$query->where('user_id', '=', user()->id);
});
}
protected function filterSortBy(EloquentBuilder $query, Entity $model, $input)
{
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$functionName = Str::camel('sort_by_' . $input);
if (method_exists($this, $functionName)) {
$this->$functionName($query, $model);
}
}
/**
* Sorting filter options
*/
protected function sortByLastCommented(EloquentBuilder $query, Entity $model)
{
$commentsTable = $this->db->getTablePrefix() . 'comments';
$morphClass = str_replace('\\', '\\\\', $model->getMorphClass());
$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');
$query->join($commentQuery, $model->getTable() . '.id', '=', 'comments.entity_id')->orderBy('last_commented', 'desc');
}
}