636 lines
22 KiB
PHP
636 lines
22 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Shaarli\Bookmark;
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use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
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use Shaarli\Config\ConfigManager;
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use Shaarli\Plugin\PluginManager;
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/**
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* Class LinkFilter.
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*
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* Perform search and filter operation on link data list.
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*/
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class BookmarkFilter
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{
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/**
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* @var string permalinks.
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*/
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public static $FILTER_HASH = 'permalink';
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/**
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* @var string text search.
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*/
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public static $FILTER_TEXT = 'fulltext';
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/**
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* @var string tag filter.
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*/
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public static $FILTER_TAG = 'tags';
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/**
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* @var string filter by day.
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*/
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public static $DEFAULT = 'NO_FILTER';
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/** @var string Visibility: all */
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public static $ALL = 'all';
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/** @var string Visibility: public */
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public static $PUBLIC = 'public';
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/** @var string Visibility: private */
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public static $PRIVATE = 'private';
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/**
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* @var string Allowed characters for hashtags (regex syntax).
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*/
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public static $HASHTAG_CHARS = '\p{Pc}\p{N}\p{L}\p{Mn}';
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/**
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* @var Bookmark[] all available bookmarks.
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*/
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private $bookmarks;
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/** @var ConfigManager */
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protected $conf;
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/** @var PluginManager */
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protected $pluginManager;
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/**
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* @param Bookmark[] $bookmarks initialization.
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*/
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public function __construct($bookmarks, ConfigManager $conf, PluginManager $pluginManager)
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{
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$this->bookmarks = $bookmarks;
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$this->conf = $conf;
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$this->pluginManager = $pluginManager;
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}
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/**
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* Filter bookmarks according to parameters.
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*
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* @param string $type Type of filter (eg. tags, permalink, etc.).
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* @param mixed $request Filter content.
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* @param bool $casesensitive Optional: Perform case sensitive filter if true.
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* @param string $visibility Optional: return only all/private/public bookmarks
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* @param bool $untaggedonly Optional: return only untagged bookmarks. Applies only if $type includes FILTER_TAG
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*
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* @return Bookmark[] filtered bookmark list.
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*
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* @throws BookmarkNotFoundException
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*/
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public function filter(
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string $type,
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$request,
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bool $casesensitive = false,
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string $visibility = 'all',
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bool $untaggedonly = false
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) {
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if (!in_array($visibility, ['all', 'public', 'private'])) {
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$visibility = 'all';
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}
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switch ($type) {
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case self::$FILTER_HASH:
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return $this->filterSmallHash($request);
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case self::$FILTER_TAG | self::$FILTER_TEXT: // == "vuotext"
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$noRequest = empty($request) || (empty($request[0]) && empty($request[1]));
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if ($noRequest) {
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if ($untaggedonly) {
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return $this->filterUntagged($visibility);
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}
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return $this->noFilter($visibility);
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}
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if ($untaggedonly) {
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$filtered = $this->filterUntagged($visibility);
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} else {
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$filtered = $this->bookmarks;
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}
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if (!empty($request[0])) {
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$filtered = (new BookmarkFilter($filtered, $this->conf, $this->pluginManager))
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->filterTags($request[0], $casesensitive, $visibility)
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;
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}
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if (!empty($request[1])) {
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$filtered = (new BookmarkFilter($filtered, $this->conf, $this->pluginManager))
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->filterFulltext($request[1], $visibility)
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;
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}
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return $filtered;
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case self::$FILTER_TEXT:
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return $this->filterFulltext($request, $visibility);
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case self::$FILTER_TAG:
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if ($untaggedonly) {
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return $this->filterUntagged($visibility);
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} else {
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return $this->filterTags($request, $casesensitive, $visibility);
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}
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default:
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return $this->noFilter($visibility);
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}
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}
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/**
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* Unknown filter, but handle private only.
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*
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* @param string $visibility Optional: return only all/private/public bookmarks
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*
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* @return Bookmark[] filtered bookmarks.
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*/
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private function noFilter(string $visibility = 'all')
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{
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$out = [];
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foreach ($this->bookmarks as $key => $value) {
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if (
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!$this->pluginManager->filterSearchEntry(
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$value,
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['source' => 'no_filter', 'visibility' => $visibility]
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)
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) {
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continue;
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}
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if ($visibility === 'all') {
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$out[$key] = $value;
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} elseif ($value->isPrivate() && $visibility === 'private') {
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$out[$key] = $value;
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} elseif (!$value->isPrivate() && $visibility === 'public') {
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$out[$key] = $value;
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}
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}
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return $out;
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}
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/**
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* Returns the shaare corresponding to a smallHash.
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*
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* @param string $smallHash permalink hash.
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*
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* @return Bookmark[] $filtered array containing permalink data.
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*
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* @throws BookmarkNotFoundException if the smallhash doesn't match any link.
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*/
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private function filterSmallHash(string $smallHash)
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{
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foreach ($this->bookmarks as $key => $l) {
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if ($smallHash == $l->getShortUrl()) {
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// Yes, this is ugly and slow
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return [$key => $l];
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}
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}
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throw new BookmarkNotFoundException();
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}
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/**
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* Returns the list of bookmarks corresponding to a full-text search
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*
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* Searches:
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* - in the URLs, title and description;
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* - are case-insensitive;
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* - terms surrounded by quotes " are exact terms search.
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* - terms starting with a dash - are excluded (except exact terms).
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*
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* Example:
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* print_r($mydb->filterFulltext('hollandais'));
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*
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* mb_convert_case($val, MB_CASE_LOWER, 'UTF-8')
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* - allows to perform searches on Unicode text
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* - see https://github.com/shaarli/Shaarli/issues/75 for examples
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*
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* @param string $searchterms search query.
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* @param string $visibility Optional: return only all/private/public bookmarks.
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*
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* @return Bookmark[] search results.
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*/
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private function filterFulltext(string $searchterms, string $visibility = 'all')
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{
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if (empty($searchterms)) {
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return $this->noFilter($visibility);
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}
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$filtered = [];
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$search = mb_convert_case(html_entity_decode($searchterms), MB_CASE_LOWER, 'UTF-8');
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$exactRegex = '/"([^"]+)"/';
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// Retrieve exact search terms.
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preg_match_all($exactRegex, $search, $exactSearch);
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$exactSearch = array_values(array_filter($exactSearch[1]));
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// Remove exact search terms to get AND terms search.
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$explodedSearchAnd = explode(' ', trim(preg_replace($exactRegex, '', $search)));
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$explodedSearchAnd = array_values(array_filter($explodedSearchAnd));
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// Filter excluding terms and update andSearch.
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$excludeSearch = [];
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$andSearch = [];
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foreach ($explodedSearchAnd as $needle) {
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if ($needle[0] == '-' && strlen($needle) > 1) {
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$excludeSearch[] = substr($needle, 1);
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} else {
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$andSearch[] = $needle;
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}
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}
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// Iterate over every stored link.
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foreach ($this->bookmarks as $id => $bookmark) {
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if (
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!$this->pluginManager->filterSearchEntry(
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$bookmark,
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[
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'source' => 'fulltext',
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'searchterms' => $searchterms,
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'andSearch' => $andSearch,
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'exactSearch' => $exactSearch,
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'excludeSearch' => $excludeSearch,
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'visibility' => $visibility
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]
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)
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) {
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continue;
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}
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// ignore non private bookmarks when 'privatonly' is on.
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if ($visibility !== 'all') {
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if (!$bookmark->isPrivate() && $visibility === 'private') {
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continue;
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} elseif ($bookmark->isPrivate() && $visibility === 'public') {
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continue;
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}
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}
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$lengths = [];
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$content = $this->buildFullTextSearchableLink($bookmark, $lengths);
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// Be optimistic
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$found = true;
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$foundPositions = [];
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// First, we look for exact term search
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// Then iterate over keywords, if keyword is not found,
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// no need to check for the others. We want all or nothing.
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foreach ([$exactSearch, $andSearch] as $search) {
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for ($i = 0; $i < count($search) && $found !== false; $i++) {
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$found = mb_strpos($content, $search[$i]);
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if ($found === false) {
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break;
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}
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$foundPositions[] = ['start' => $found, 'end' => $found + mb_strlen($search[$i])];
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}
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}
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// Exclude terms.
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for ($i = 0; $i < count($excludeSearch) && $found !== false; $i++) {
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$found = strpos($content, $excludeSearch[$i]) === false;
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}
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if ($found !== false) {
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$bookmark->setAdditionalContentEntry(
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'search_highlight',
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$this->postProcessFoundPositions($lengths, $foundPositions)
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);
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$filtered[$id] = $bookmark;
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}
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}
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return $filtered;
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}
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/**
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* Returns the list of bookmarks associated with a given list of tags
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*
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* You can specify one or more tags, separated by space or a comma, e.g.
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* print_r($mydb->filterTags('linux programming'));
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*
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* @param string|array $tags list of tags, separated by commas or blank spaces if passed as string.
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* @param bool $casesensitive ignore case if false.
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* @param string $visibility Optional: return only all/private/public bookmarks.
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*
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* @return Bookmark[] filtered bookmarks.
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*/
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public function filterTags($tags, bool $casesensitive = false, string $visibility = 'all')
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{
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$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
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// get single tags (we may get passed an array, even though the docs say different)
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$inputTags = $tags;
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if (!is_array($tags)) {
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// we got an input string, split tags
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$inputTags = tags_str2array($inputTags, $tagsSeparator);
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}
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if (count($inputTags) === 0) {
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// no input tags
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return $this->noFilter($visibility);
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}
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// If we only have public visibility, we can't look for hidden tags
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if ($visibility === self::$PUBLIC) {
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$inputTags = array_values(array_filter($inputTags, function ($tag) {
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return ! startsWith($tag, '.');
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}));
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if (empty($inputTags)) {
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return [];
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}
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}
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// build regex from all tags
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$re_and = implode(array_map([$this, 'tag2regex'], $inputTags));
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$re = '/^' . $re_and;
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$orTags = array_filter(array_map(function ($tag) {
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return startsWith($tag, '~') ? substr($tag, 1) : null;
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}, $inputTags));
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$re_or = implode('|', array_map([$this, 'tag2matchterm'], $orTags));
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if ($re_or) {
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$re_or = '(' . $re_or . ')';
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$re .= $this->term2match($re_or, false);
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}
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$re .= '.*$/';
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if (!$casesensitive) {
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// make regex case insensitive
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$re .= 'i';
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}
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// create resulting array
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$filtered = [];
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// iterate over each link
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foreach ($this->bookmarks as $key => $bookmark) {
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if (
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!$this->pluginManager->filterSearchEntry(
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$bookmark,
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[
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'source' => 'tags',
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'tags' => $tags,
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'casesensitive' => $casesensitive,
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'visibility' => $visibility
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]
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)
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) {
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continue;
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}
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// check level of visibility
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// ignore non private bookmarks when 'privateonly' is on.
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if ($visibility !== 'all') {
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if (!$bookmark->isPrivate() && $visibility === 'private') {
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continue;
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} elseif ($bookmark->isPrivate() && $visibility === 'public') {
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continue;
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}
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}
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// build search string, start with tags of current link
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$search = $bookmark->getTagsString($tagsSeparator);
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if (strlen(trim($bookmark->getDescription())) && strpos($bookmark->getDescription(), '#') !== false) {
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// description given and at least one possible tag found
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$descTags = [];
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// find all tags in the form of #tag in the description
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preg_match_all(
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'/(?<![' . self::$HASHTAG_CHARS . '])#([' . self::$HASHTAG_CHARS . ']+?)\b/sm',
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$bookmark->getDescription(),
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$descTags
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);
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if (count($descTags[1])) {
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// there were some tags in the description, add them to the search string
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$search .= $tagsSeparator . tags_array2str($descTags[1], $tagsSeparator);
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}
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}
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// match regular expression with search string
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if (!preg_match($re, $search)) {
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// this entry does _not_ match our regex
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continue;
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}
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$filtered[$key] = $bookmark;
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}
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return $filtered;
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}
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/**
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* Return only bookmarks without any tag.
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*
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* @param string $visibility return only all/private/public bookmarks.
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*
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* @return Bookmark[] filtered bookmarks.
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*/
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public function filterUntagged(string $visibility)
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{
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$filtered = [];
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foreach ($this->bookmarks as $key => $bookmark) {
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if (
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!$this->pluginManager->filterSearchEntry(
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$bookmark,
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['source' => 'untagged', 'visibility' => $visibility]
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)
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) {
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continue;
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}
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if ($visibility !== 'all') {
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if (!$bookmark->isPrivate() && $visibility === 'private') {
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continue;
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} elseif ($bookmark->isPrivate() && $visibility === 'public') {
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continue;
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}
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}
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if (empty($bookmark->getTags())) {
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$filtered[$key] = $bookmark;
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}
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}
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return $filtered;
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}
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/**
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* Convert a list of tags (str) to an array. Also
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* - handle case sensitivity.
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* - accepts spaces commas as separator.
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*
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* @param string $tags string containing a list of tags.
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* @param bool $casesensitive will convert everything to lowercase if false.
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*
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* @return string[] filtered tags string.
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*/
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public static function tagsStrToArray(string $tags, bool $casesensitive): array
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{
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// We use UTF-8 conversion to handle various graphemes (i.e. cyrillic, or greek)
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$tagsOut = $casesensitive ? $tags : mb_convert_case($tags, MB_CASE_LOWER, 'UTF-8');
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$tagsOut = str_replace(',', ' ', $tagsOut);
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return preg_split('/\s+/', $tagsOut, -1, PREG_SPLIT_NO_EMPTY);
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}
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/**
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* generate a regex fragment out of a tag
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*
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* @param string $tag to generate regexs from. may start with '-'
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* to negate, contain '*' as wildcard. Tags starting with '~' are
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* treated separately as an 'OR' clause.
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*
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* @return string generated regex fragment
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*/
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protected function tag2regex(string $tag): string
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{
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$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
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if (!$tag || $tag === "-" || $tag === "*" || $tag[0] === "~") {
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// nothing to search, return empty regex
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return '';
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}
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$negate = false;
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if ($tag[0] === "+" && $tag[1]) {
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$tag = substr($tag, 1); // use offset to start after '+' character
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}
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if ($tag[0] === "-") {
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// query is negated
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$tag = substr($tag, 1); // use offset to start after '-' character
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$negate = true;
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}
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$term = $this->tag2matchterm($tag);
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return $this->term2match($term, $negate);
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}
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/**
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* generate a regex match term fragment out of a tag
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*
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* @param string $tag to to generate regexs from. This function
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* assumes any leading flags ('-', '~') have been stripped. The
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* wildcard flag '*' is expanded by this function and any other
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* regex characters are escaped.
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*
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* @return string generated regex match term fragment
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*/
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protected function tag2matchterm(string $tag): string
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{
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$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
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$len = strlen($tag);
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$term = '';
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// iterate over string, separating it into placeholder and content
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$i = 0; // start at first character
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for (; $i < $len; $i++) {
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if ($tag[$i] === '*') {
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// placeholder found
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$term .= '[^' . $tagsSeparator . ']*?';
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} else {
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// regular characters
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$offset = strpos($tag, '*', $i);
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if ($offset === false) {
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// no placeholder found, set offset to end of string
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$offset = $len;
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}
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// subtract one, as we want to get before the placeholder or end of string
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$offset -= 1;
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// we got a tag name that we want to search for. escape any regex characters to prevent conflicts.
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$term .= preg_quote(substr($tag, $i, $offset - $i + 1), '/');
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// move $i on
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$i = $offset;
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}
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}
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return $term;
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}
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/**
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* generate a regex fragment out of a match term
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*
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* @param string $term is the match term already generated by tag2matchterm
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* @param bool $negate if true create a negative lookahead
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*
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* @return string generated regex fragment
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*/
|
|
protected function term2match(string $term, bool $negate): string
|
|
{
|
|
$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
|
|
$regex = $negate ? '(?!' : '(?='; // use negative or positive lookahead
|
|
|
|
// before tag may only be the separator or the beginning
|
|
$regex .= '.*(?:^|' . $tagsSeparator . ')';
|
|
|
|
$regex .= $term;
|
|
|
|
// after the tag may only be the separator or the end
|
|
$regex .= '(?:$|' . $tagsSeparator . '))';
|
|
return $regex;
|
|
}
|
|
|
|
/**
|
|
* This method finalize the content of the foundPositions array,
|
|
* by associated all search results to their associated bookmark field,
|
|
* making sure that there is no overlapping results, etc.
|
|
*
|
|
* @param array $fieldLengths Start and end positions of every bookmark fields in the aggregated bookmark content.
|
|
* @param array $foundPositions Positions where the search results were found in the aggregated content.
|
|
*
|
|
* @return array Updated $foundPositions, by bookmark field.
|
|
*/
|
|
protected function postProcessFoundPositions(array $fieldLengths, array $foundPositions): array
|
|
{
|
|
// Sort results by starting position ASC.
|
|
usort($foundPositions, function (array $entryA, array $entryB): int {
|
|
return $entryA['start'] > $entryB['start'] ? 1 : -1;
|
|
});
|
|
|
|
$out = [];
|
|
$currentMax = -1;
|
|
foreach ($foundPositions as $foundPosition) {
|
|
// we do not allow overlapping highlights
|
|
if ($foundPosition['start'] < $currentMax) {
|
|
continue;
|
|
}
|
|
|
|
$currentMax = $foundPosition['end'];
|
|
foreach ($fieldLengths as $part => $length) {
|
|
if ($foundPosition['start'] < $length['start'] || $foundPosition['start'] > $length['end']) {
|
|
continue;
|
|
}
|
|
|
|
$out[$part][] = [
|
|
'start' => $foundPosition['start'] - $length['start'],
|
|
'end' => $foundPosition['end'] - $length['start'],
|
|
];
|
|
break;
|
|
}
|
|
}
|
|
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* Concatenate link fields to search across fields. Adds a '\' separator for exact search terms.
|
|
* Also populate $length array with starting and ending positions of every bookmark field
|
|
* inside concatenated content.
|
|
*
|
|
* @param Bookmark $link
|
|
* @param array $lengths (by reference)
|
|
*
|
|
* @return string Lowercase concatenated fields content.
|
|
*/
|
|
protected function buildFullTextSearchableLink(Bookmark $link, array &$lengths): string
|
|
{
|
|
$tagString = $link->getTagsString($this->conf->get('general.tags_separator', ' '));
|
|
$content = mb_convert_case($link->getTitle(), MB_CASE_LOWER, 'UTF-8') . '\\';
|
|
$content .= mb_convert_case($link->getDescription(), MB_CASE_LOWER, 'UTF-8') . '\\';
|
|
$content .= mb_convert_case($link->getUrl(), MB_CASE_LOWER, 'UTF-8') . '\\';
|
|
$content .= mb_convert_case($tagString, MB_CASE_LOWER, 'UTF-8') . '\\';
|
|
|
|
$lengths['title'] = ['start' => 0, 'end' => mb_strlen($link->getTitle())];
|
|
$nextField = $lengths['title']['end'] + 1;
|
|
$lengths['description'] = ['start' => $nextField, 'end' => $nextField + mb_strlen($link->getDescription())];
|
|
$nextField = $lengths['description']['end'] + 1;
|
|
$lengths['url'] = ['start' => $nextField, 'end' => $nextField + mb_strlen($link->getUrl())];
|
|
$nextField = $lengths['url']['end'] + 1;
|
|
$lengths['tags'] = ['start' => $nextField, 'end' => $nextField + mb_strlen($tagString)];
|
|
|
|
return $content;
|
|
}
|
|
}
|