278 lines
8.4 KiB
PHP
278 lines
8.4 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 array all available links.
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*/
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private $links;
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/**
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* @param array $links initialization.
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*/
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public function __construct($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 string $request Filter content.
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* @param bool $casesensitive Optional: Perform case sensitive filter if true.
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* @param bool $privateonly Optional: Only returns private links if true.
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*
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* @return array filtered link list.
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*/
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public function filter($type, $request, $casesensitive = false, $privateonly = false)
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{
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switch($type) {
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case self::$FILTER_HASH:
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return $this->filterSmallHash($request);
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break;
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case self::$FILTER_TEXT:
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return $this->filterFulltext($request, $privateonly);
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break;
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case self::$FILTER_TAG:
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return $this->filterTags($request, $casesensitive, $privateonly);
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break;
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case self::$FILTER_DAY:
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return $this->filterDay($request);
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break;
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default:
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return $this->noFilter($privateonly);
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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 bool $privateonly returns private link only if true.
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*
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* @return array filtered links.
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*/
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private function noFilter($privateonly = false)
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{
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if (! $privateonly) {
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krsort($this->links);
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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 $value) {
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if ($value['private']) {
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$out[$value['linkdate']] = $value;
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}
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}
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krsort($out);
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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 $filtered array containing permalink data.
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*/
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private function filterSmallHash($smallHash)
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{
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$filtered = array();
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foreach ($this->links as $l) {
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if ($smallHash == smallHash($l['linkdate'])) {
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// Yes, this is ugly and slow
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$filtered[$l['linkdate']] = $l;
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return $filtered;
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}
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}
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return $filtered;
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}
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/**
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* Returns the list of links corresponding to a full-text search
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*
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* Searches:
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* - in the URLs, title and description;
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* - are case-insensitive.
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*
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* Example:
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* print_r($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 bool $privateonly return only private links if true.
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*
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* @return array search results.
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*/
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private function filterFulltext($searchterms, $privateonly = false)
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{
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$search = mb_convert_case(html_entity_decode($searchterms), MB_CASE_LOWER, 'UTF-8');
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$explodedSearch = explode(' ', trim($search));
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$keys = array('title', 'description', 'url', 'tags');
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$found = true;
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$searchExactPhrase = false;
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// Check if we're using double-quotes to search for the exact string
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if ($search[0] == '"' && $search[strlen($search) - 1] == '"') {
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$searchExactPhrase = true;
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// Remove the double-quotes as they are not what we search for
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$search = substr($search, 1, -1);
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}
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// Iterate over every stored link.
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foreach ($this->links as $link) {
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// ignore non private links when 'privatonly' is on.
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if (! $link['private'] && $privateonly === true) {
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continue;
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}
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// Iterate over searchable link fields.
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foreach ($keys as $key) {
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// Be optimistic
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$found = true;
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// FIXME: Find a better word for where you're searching in
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$haystack = mb_convert_case($link[$key], MB_CASE_LOWER, 'UTF-8');
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// When searching for the phrase, check if it's in the haystack...
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if ( $searchExactPhrase && strpos($haystack, $search) !== false) {
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break;
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}
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else {
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// Iterate over keywords, if keyword is not found,
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// no need to check for the others. We want all or nothing.
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foreach($explodedSearch as $keyword) {
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if(strpos($haystack, $keyword) === false) {
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$found = false;
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break;
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}
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}
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}
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// One of the fields of the link matches, no need to check the other.
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if ($found) {
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break;
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}
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}
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if ($found) {
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$filtered[$link['linkdate']] = $link;
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}
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}
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krsort($filtered);
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return $filtered;
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}
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/**
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* Returns the list of links associated with a given list of tags
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*
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* You can specify one or more tags, separated by space or a comma, e.g.
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* print_r($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 bool $privateonly returns private links only.
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*
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* @return array filtered links.
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*/
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public function filterTags($tags, $casesensitive = false, $privateonly = false)
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{
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$searchtags = $this->tagsStrToArray($tags, $casesensitive);
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$filtered = array();
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foreach ($this->links as $l) {
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// ignore non private links when 'privatonly' is on.
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if (! $l['private'] && $privateonly === true) {
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continue;
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}
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$linktags = $this->tagsStrToArray($l['tags'], $casesensitive);
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if (count(array_intersect($linktags, $searchtags)) == count($searchtags)) {
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$filtered[$l['linkdate']] = $l;
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}
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}
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krsort($filtered);
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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 $l) {
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if (startsWith($l['linkdate'], $day)) {
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$filtered[$l['linkdate']] = $l;
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}
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}
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ksort($filtered);
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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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* - remove private tags for loggedout users.
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*
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* @param string $tags string containing a list of tags.
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* @param bool $casesensitive will convert everything to lowercase if false.
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*
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* @return array filtered tags string.
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*/
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public function tagsStrToArray($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(',', ' ', $tagsOut);
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return explode(' ', trim($tagsOut));
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}
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}
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