453 lines
15 KiB
PHP
453 lines
15 KiB
PHP
<?php
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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 LinkFilter
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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 $FILTER_DAY = 'FILTER_DAY';
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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 LinkDB all available links.
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*/
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private $links;
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/**
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* @param LinkDB $links initialization.
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*/
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public function __construct($links)
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{
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$this->links = $links;
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}
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/**
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* Filter links 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 links
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* @param string $untaggedonly Optional: return only untagged links. Applies only if $type includes FILTER_TAG
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*
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* @return array filtered link list.
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*/
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public function filter($type, $request, $casesensitive = false, $visibility = 'all', $untaggedonly = false)
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{
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if (! in_array($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 = $this->links;
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}
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if (!empty($request[0])) {
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$filtered = (new LinkFilter($filtered))->filterTags($request[0], $casesensitive, $visibility);
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}
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if (!empty($request[1])) {
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$filtered = (new LinkFilter($filtered))->filterFulltext($request[1], $visibility);
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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, $visibility);
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}
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case self::$FILTER_DAY:
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return $this->filterDay($request);
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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 $visibility Optional: return only all/private/public links
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*
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* @return array filtered links.
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*/
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private function noFilter($visibility = 'all')
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{
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if ($visibility === 'all') {
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return $this->links;
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}
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$out = array();
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foreach ($this->links as $key => $value) {
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if ($value['private'] && $visibility === 'private') {
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$out[$key] = $value;
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} elseif (! $value['private'] && $visibility === 'public') {
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$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 array $filtered array containing permalink data.
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*
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* @throws LinkNotFoundException if the smallhash doesn't match any link.
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*/
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private function filterSmallHash($smallHash)
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{
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$filtered = array();
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foreach ($this->links as $key => $l) {
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if ($smallHash == $l['shorturl']) {
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// Yes, this is ugly and slow
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$filtered[$key] = $l;
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return $filtered;
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}
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}
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if (empty($filtered)) {
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throw new LinkNotFoundException();
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}
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return $filtered;
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}
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/**
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* Returns the list of links corresponding to a full-text search
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*
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* Searches:
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* - in the URLs, title and description;
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* - are case-insensitive;
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* - terms surrounded by quotes " are exact terms search.
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* - terms starting with a dash - are excluded (except exact terms).
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*
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* Example:
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* print_r($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 $visibility Optional: return only all/private/public links.
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*
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* @return array search results.
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*/
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private function filterFulltext($searchterms, $visibility = 'all')
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{
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if (empty($searchterms)) {
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return $this->noFilter($visibility);
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}
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$filtered = array();
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$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 = array();
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$andSearch = array();
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foreach ($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[] = $needle;
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}
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}
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$keys = array('title', 'description', 'url', 'tags');
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// Iterate over every stored link.
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foreach ($this->links as $id => $link) {
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// ignore non private links when 'privatonly' is on.
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if ($visibility !== 'all') {
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if (! $link['private'] && $visibility === 'private') {
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continue;
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} elseif ($link['private'] && $visibility === 'public') {
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continue;
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}
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}
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// Concatenate link fields to search across fields.
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// Adds a '\' separator for exact search terms.
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$content = '';
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foreach ($keys as $key) {
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$content .= mb_convert_case($link[$key], MB_CASE_LOWER, 'UTF-8') . '\\';
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}
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// Be optimistic
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$found = true;
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// First, we look for exact term search
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for ($i = 0; $i < count($exactSearch) && $found; $i++) {
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$found = strpos($content, $exactSearch[$i]) !== false;
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}
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// 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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for ($i = 0; $i < count($andSearch) && $found; $i++) {
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$found = strpos($content, $andSearch[$i]) !== false;
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}
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// Exclude terms.
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for ($i = 0; $i < count($excludeSearch) && $found; $i++) {
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$found = strpos($content, $excludeSearch[$i]) === false;
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}
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if ($found) {
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$filtered[$id] = $link;
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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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* generate a regex fragment out of a tag
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* @param string $tag to to generate regexs from. may start with '-' to negate, contain '*' as wildcard
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* @return string generated regex fragment
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*/
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private static function tag2regex($tag)
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{
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$len = strlen($tag);
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if (!$len || $tag === "-" || $tag === "*") {
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// nothing to search, return empty regex
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return '';
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}
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if ($tag[0] === "-") {
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// query is negated
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$i = 1; // use offset to start after '-' character
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$regex = '(?!'; // create negative lookahead
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} else {
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$i = 0; // start at first character
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$regex = '(?='; // use positive lookahead
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}
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$regex .= '.*(?:^| )'; // before tag may only be a space or the beginning
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// iterate over string, separating it into placeholder and content
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for (; $i < $len; $i++) {
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if ($tag[$i] === '*') {
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// placeholder found
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$regex .= '[^ ]*?';
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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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$regex .= preg_quote(substr($tag, $i, $offset - $i + 1), '/');
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// move $i on
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$i = $offset;
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}
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}
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$regex .= '(?:$| ))'; // after the tag may only be a space or the end
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return $regex;
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}
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/**
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* Returns the list of links associated with a given list of tags
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*
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* You can specify one or more tags, separated by space or a comma, e.g.
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* print_r($mydb->filterTags('linux programming'));
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*
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* @param string $tags list of tags separated by commas or blank spaces.
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* @param bool $casesensitive ignore case if false.
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* @param string $visibility Optional: return only all/private/public links.
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*
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* @return array filtered links.
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*/
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public function filterTags($tags, $casesensitive = false, $visibility = 'all')
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{
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// get single tags (we may get passed an array, even though the docs say different)
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$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 = preg_split('/(?:\s+)|,/', $inputTags, -1, PREG_SPLIT_NO_EMPTY);
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}
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if (!count($inputTags)) {
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// no input tags
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return $this->noFilter($visibility);
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}
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// build regex from all tags
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$re = '/^' . implode(array_map("self::tag2regex", $inputTags)) . '.*$/';
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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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$filtered = array();
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// iterate over each link
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foreach ($this->links as $key => $link) {
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// check level of visibility
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// ignore non private links when 'privateonly' is on.
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if ($visibility !== 'all') {
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if (! $link['private'] && $visibility === 'private') {
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continue;
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} elseif ($link['private'] && $visibility === 'public') {
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continue;
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}
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}
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$search = $link['tags']; // build search string, start with tags of current link
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if (strlen(trim($link['description'])) && strpos($link['description'], '#') !== false) {
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// description given and at least one possible tag found
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$descTags = array();
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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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$link['description'],
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$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 .= ' ' . implode(' ', $descTags[1]);
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}
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};
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// match regular expression with search string
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if (!preg_match($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] = $link;
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}
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return $filtered;
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}
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/**
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* Return only links without any tag.
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*
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* @param string $visibility return only all/private/public links.
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*
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* @return array filtered links.
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*/
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public function filterUntagged($visibility)
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{
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$filtered = [];
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foreach ($this->links as $key => $link) {
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if ($visibility !== 'all') {
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if (! $link['private'] && $visibility === 'private') {
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continue;
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} elseif ($link['private'] && $visibility === 'public') {
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continue;
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}
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}
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if (empty(trim($link['tags']))) {
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$filtered[$key] = $link;
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}
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}
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return $filtered;
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}
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/**
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* Returns the list of articles for a given day, chronologically sorted
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*
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* Day must be in the form 'YYYYMMDD' (e.g. '20120125'), e.g.
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* print_r($mydb->filterDay('20120125'));
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*
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* @param string $day day to filter.
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*
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* @return array all link matching given day.
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*
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* @throws Exception if date format is invalid.
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*/
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public function filterDay($day)
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{
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if (! checkDateFormat('Ymd', $day)) {
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throw new Exception('Invalid date format');
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}
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$filtered = array();
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foreach ($this->links as $key => $l) {
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if ($l['created']->format('Ymd') == $day) {
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$filtered[$key] = $l;
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}
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}
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// sort by date ASC
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return array_reverse($filtered, true);
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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 $casesensitive will convert everything to lowercase if false.
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*
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* @return array filtered tags string.
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*/
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public static function tagsStrToArray($tags, $casesensitive)
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{
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// We use UTF-8 conversion to handle various graphemes (i.e. cyrillic, or greek)
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$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+/', $tagsOut, -1, PREG_SPLIT_NO_EMPTY);
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}
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}
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class LinkNotFoundException extends Exception
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{
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/**
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* LinkNotFoundException constructor.
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*/
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public function __construct()
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{
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$this->message = t('The link you are trying to reach does not exist or has been deleted.');
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}
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}
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