MyShaarli/application/bookmark/BookmarkFilter.php

636 lines
22 KiB
PHP
Raw Normal View History

2023-05-24 11:35:15 +02:00
<?php
declare(strict_types=1);
namespace Shaarli\Bookmark;
use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
use Shaarli\Config\ConfigManager;
use Shaarli\Plugin\PluginManager;
/**
* Class LinkFilter.
*
* Perform search and filter operation on link data list.
*/
class BookmarkFilter
{
/**
* @var string permalinks.
*/
public static $FILTER_HASH = 'permalink';
/**
* @var string text search.
*/
public static $FILTER_TEXT = 'fulltext';
/**
* @var string tag filter.
*/
public static $FILTER_TAG = 'tags';
/**
* @var string filter by day.
*/
public static $DEFAULT = 'NO_FILTER';
/** @var string Visibility: all */
public static $ALL = 'all';
/** @var string Visibility: public */
public static $PUBLIC = 'public';
/** @var string Visibility: private */
public static $PRIVATE = 'private';
/**
* @var string Allowed characters for hashtags (regex syntax).
*/
public static $HASHTAG_CHARS = '\p{Pc}\p{N}\p{L}\p{Mn}';
/**
* @var Bookmark[] all available bookmarks.
*/
private $bookmarks;
/** @var ConfigManager */
protected $conf;
/** @var PluginManager */
protected $pluginManager;
/**
* @param Bookmark[] $bookmarks initialization.
*/
public function __construct($bookmarks, ConfigManager $conf, PluginManager $pluginManager)
{
$this->bookmarks = $bookmarks;
$this->conf = $conf;
$this->pluginManager = $pluginManager;
}
/**
* Filter bookmarks according to parameters.
*
* @param string $type Type of filter (eg. tags, permalink, etc.).
* @param mixed $request Filter content.
* @param bool $casesensitive Optional: Perform case sensitive filter if true.
* @param string $visibility Optional: return only all/private/public bookmarks
* @param bool $untaggedonly Optional: return only untagged bookmarks. Applies only if $type includes FILTER_TAG
*
* @return Bookmark[] filtered bookmark list.
*
* @throws BookmarkNotFoundException
*/
public function filter(
string $type,
$request,
bool $casesensitive = false,
string $visibility = 'all',
bool $untaggedonly = false
) {
if (!in_array($visibility, ['all', 'public', 'private'])) {
$visibility = 'all';
}
switch ($type) {
case self::$FILTER_HASH:
return $this->filterSmallHash($request);
case self::$FILTER_TAG | self::$FILTER_TEXT: // == "vuotext"
$noRequest = empty($request) || (empty($request[0]) && empty($request[1]));
if ($noRequest) {
if ($untaggedonly) {
return $this->filterUntagged($visibility);
}
return $this->noFilter($visibility);
}
if ($untaggedonly) {
$filtered = $this->filterUntagged($visibility);
} else {
$filtered = $this->bookmarks;
}
if (!empty($request[0])) {
$filtered = (new BookmarkFilter($filtered, $this->conf, $this->pluginManager))
->filterTags($request[0], $casesensitive, $visibility)
;
}
if (!empty($request[1])) {
$filtered = (new BookmarkFilter($filtered, $this->conf, $this->pluginManager))
->filterFulltext($request[1], $visibility)
;
}
return $filtered;
case self::$FILTER_TEXT:
return $this->filterFulltext($request, $visibility);
case self::$FILTER_TAG:
if ($untaggedonly) {
return $this->filterUntagged($visibility);
} else {
return $this->filterTags($request, $casesensitive, $visibility);
}
default:
return $this->noFilter($visibility);
}
}
/**
* Unknown filter, but handle private only.
*
* @param string $visibility Optional: return only all/private/public bookmarks
*
* @return Bookmark[] filtered bookmarks.
*/
private function noFilter(string $visibility = 'all')
{
$out = [];
foreach ($this->bookmarks as $key => $value) {
if (
!$this->pluginManager->filterSearchEntry(
$value,
['source' => 'no_filter', 'visibility' => $visibility]
)
) {
continue;
}
if ($visibility === 'all') {
$out[$key] = $value;
} elseif ($value->isPrivate() && $visibility === 'private') {
$out[$key] = $value;
} elseif (!$value->isPrivate() && $visibility === 'public') {
$out[$key] = $value;
}
}
return $out;
}
/**
* Returns the shaare corresponding to a smallHash.
*
* @param string $smallHash permalink hash.
*
* @return Bookmark[] $filtered array containing permalink data.
*
* @throws BookmarkNotFoundException if the smallhash doesn't match any link.
*/
private function filterSmallHash(string $smallHash)
{
foreach ($this->bookmarks as $key => $l) {
if ($smallHash == $l->getShortUrl()) {
// Yes, this is ugly and slow
return [$key => $l];
}
}
throw new BookmarkNotFoundException();
}
/**
* Returns the list of bookmarks corresponding to a full-text search
*
* Searches:
* - in the URLs, title and description;
* - are case-insensitive;
* - terms surrounded by quotes " are exact terms search.
* - terms starting with a dash - are excluded (except exact terms).
*
* Example:
* print_r($mydb->filterFulltext('hollandais'));
*
* mb_convert_case($val, MB_CASE_LOWER, 'UTF-8')
* - allows to perform searches on Unicode text
* - see https://github.com/shaarli/Shaarli/issues/75 for examples
*
* @param string $searchterms search query.
* @param string $visibility Optional: return only all/private/public bookmarks.
*
* @return Bookmark[] search results.
*/
private function filterFulltext(string $searchterms, string $visibility = 'all')
{
if (empty($searchterms)) {
return $this->noFilter($visibility);
}
$filtered = [];
$search = mb_convert_case(html_entity_decode($searchterms), MB_CASE_LOWER, 'UTF-8');
$exactRegex = '/"([^"]+)"/';
// Retrieve exact search terms.
preg_match_all($exactRegex, $search, $exactSearch);
$exactSearch = array_values(array_filter($exactSearch[1]));
// Remove exact search terms to get AND terms search.
$explodedSearchAnd = explode(' ', trim(preg_replace($exactRegex, '', $search)));
$explodedSearchAnd = array_values(array_filter($explodedSearchAnd));
// Filter excluding terms and update andSearch.
$excludeSearch = [];
$andSearch = [];
foreach ($explodedSearchAnd as $needle) {
if ($needle[0] == '-' && strlen($needle) > 1) {
$excludeSearch[] = substr($needle, 1);
} else {
$andSearch[] = $needle;
}
}
// Iterate over every stored link.
foreach ($this->bookmarks as $id => $bookmark) {
if (
!$this->pluginManager->filterSearchEntry(
$bookmark,
[
'source' => 'fulltext',
'searchterms' => $searchterms,
'andSearch' => $andSearch,
'exactSearch' => $exactSearch,
'excludeSearch' => $excludeSearch,
'visibility' => $visibility
]
)
) {
continue;
}
// ignore non private bookmarks when 'privatonly' is on.
if ($visibility !== 'all') {
if (!$bookmark->isPrivate() && $visibility === 'private') {
continue;
} elseif ($bookmark->isPrivate() && $visibility === 'public') {
continue;
}
}
$lengths = [];
$content = $this->buildFullTextSearchableLink($bookmark, $lengths);
// Be optimistic
$found = true;
$foundPositions = [];
// First, we look for exact term search
// Then iterate over keywords, if keyword is not found,
// no need to check for the others. We want all or nothing.
foreach ([$exactSearch, $andSearch] as $search) {
for ($i = 0; $i < count($search) && $found !== false; $i++) {
$found = mb_strpos($content, $search[$i]);
if ($found === false) {
break;
}
$foundPositions[] = ['start' => $found, 'end' => $found + mb_strlen($search[$i])];
}
}
// Exclude terms.
for ($i = 0; $i < count($excludeSearch) && $found !== false; $i++) {
$found = strpos($content, $excludeSearch[$i]) === false;
}
if ($found !== false) {
$bookmark->setAdditionalContentEntry(
'search_highlight',
$this->postProcessFoundPositions($lengths, $foundPositions)
);
$filtered[$id] = $bookmark;
}
}
return $filtered;
}
/**
* Returns the list of bookmarks associated with a given list of tags
*
* You can specify one or more tags, separated by space or a comma, e.g.
* print_r($mydb->filterTags('linux programming'));
*
* @param string|array $tags list of tags, separated by commas or blank spaces if passed as string.
* @param bool $casesensitive ignore case if false.
* @param string $visibility Optional: return only all/private/public bookmarks.
*
* @return Bookmark[] filtered bookmarks.
*/
public function filterTags($tags, bool $casesensitive = false, string $visibility = 'all')
{
$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
// get single tags (we may get passed an array, even though the docs say different)
$inputTags = $tags;
if (!is_array($tags)) {
// we got an input string, split tags
$inputTags = tags_str2array($inputTags, $tagsSeparator);
}
if (count($inputTags) === 0) {
// no input tags
return $this->noFilter($visibility);
}
// If we only have public visibility, we can't look for hidden tags
if ($visibility === self::$PUBLIC) {
$inputTags = array_values(array_filter($inputTags, function ($tag) {
return ! startsWith($tag, '.');
}));
if (empty($inputTags)) {
return [];
}
}
// build regex from all tags
$re_and = implode(array_map([$this, 'tag2regex'], $inputTags));
$re = '/^' . $re_and;
$orTags = array_filter(array_map(function ($tag) {
return startsWith($tag, '~') ? substr($tag, 1) : null;
}, $inputTags));
$re_or = implode('|', array_map([$this, 'tag2matchterm'], $orTags));
if ($re_or) {
$re_or = '(' . $re_or . ')';
$re .= $this->term2match($re_or, false);
}
$re .= '.*$/';
if (!$casesensitive) {
// make regex case insensitive
$re .= 'i';
}
// create resulting array
$filtered = [];
// iterate over each link
foreach ($this->bookmarks as $key => $bookmark) {
if (
!$this->pluginManager->filterSearchEntry(
$bookmark,
[
'source' => 'tags',
'tags' => $tags,
'casesensitive' => $casesensitive,
'visibility' => $visibility
]
)
) {
continue;
}
// check level of visibility
// ignore non private bookmarks when 'privateonly' is on.
if ($visibility !== 'all') {
if (!$bookmark->isPrivate() && $visibility === 'private') {
continue;
} elseif ($bookmark->isPrivate() && $visibility === 'public') {
continue;
}
}
// build search string, start with tags of current link
$search = $bookmark->getTagsString($tagsSeparator);
if (strlen(trim($bookmark->getDescription())) && strpos($bookmark->getDescription(), '#') !== false) {
// description given and at least one possible tag found
$descTags = [];
// find all tags in the form of #tag in the description
preg_match_all(
'/(?<![' . self::$HASHTAG_CHARS . '])#([' . self::$HASHTAG_CHARS . ']+?)\b/sm',
$bookmark->getDescription(),
$descTags
);
if (count($descTags[1])) {
// there were some tags in the description, add them to the search string
$search .= $tagsSeparator . tags_array2str($descTags[1], $tagsSeparator);
}
}
// match regular expression with search string
if (!preg_match($re, $search)) {
// this entry does _not_ match our regex
continue;
}
$filtered[$key] = $bookmark;
}
return $filtered;
}
/**
* Return only bookmarks without any tag.
*
* @param string $visibility return only all/private/public bookmarks.
*
* @return Bookmark[] filtered bookmarks.
*/
public function filterUntagged(string $visibility)
{
$filtered = [];
foreach ($this->bookmarks as $key => $bookmark) {
if (
!$this->pluginManager->filterSearchEntry(
$bookmark,
['source' => 'untagged', 'visibility' => $visibility]
)
) {
continue;
}
if ($visibility !== 'all') {
if (!$bookmark->isPrivate() && $visibility === 'private') {
continue;
} elseif ($bookmark->isPrivate() && $visibility === 'public') {
continue;
}
}
if (empty($bookmark->getTags())) {
$filtered[$key] = $bookmark;
}
}
return $filtered;
}
/**
* Convert a list of tags (str) to an array. Also
* - handle case sensitivity.
* - accepts spaces commas as separator.
*
* @param string $tags string containing a list of tags.
* @param bool $casesensitive will convert everything to lowercase if false.
*
* @return string[] filtered tags string.
*/
public static function tagsStrToArray(string $tags, bool $casesensitive): array
{
// We use UTF-8 conversion to handle various graphemes (i.e. cyrillic, or greek)
$tagsOut = $casesensitive ? $tags : mb_convert_case($tags, MB_CASE_LOWER, 'UTF-8');
$tagsOut = str_replace(',', ' ', $tagsOut);
return preg_split('/\s+/', $tagsOut, -1, PREG_SPLIT_NO_EMPTY);
}
/**
* generate a regex fragment out of a tag
*
* @param string $tag to generate regexs from. may start with '-'
* to negate, contain '*' as wildcard. Tags starting with '~' are
* treated separately as an 'OR' clause.
*
* @return string generated regex fragment
*/
protected function tag2regex(string $tag): string
{
$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
if (!$tag || $tag === "-" || $tag === "*" || $tag[0] === "~") {
// nothing to search, return empty regex
return '';
}
$negate = false;
if ($tag[0] === "+" && $tag[1]) {
$tag = substr($tag, 1); // use offset to start after '+' character
}
if ($tag[0] === "-") {
// query is negated
$tag = substr($tag, 1); // use offset to start after '-' character
$negate = true;
}
$term = $this->tag2matchterm($tag);
return $this->term2match($term, $negate);
}
/**
* generate a regex match term fragment out of a tag
*
* @param string $tag to to generate regexs from. This function
* assumes any leading flags ('-', '~') have been stripped. The
* wildcard flag '*' is expanded by this function and any other
* regex characters are escaped.
*
* @return string generated regex match term fragment
*/
protected function tag2matchterm(string $tag): string
{
$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
$len = strlen($tag);
$term = '';
// iterate over string, separating it into placeholder and content
$i = 0; // start at first character
for (; $i < $len; $i++) {
if ($tag[$i] === '*') {
// placeholder found
$term .= '[^' . $tagsSeparator . ']*?';
} else {
// regular characters
$offset = strpos($tag, '*', $i);
if ($offset === false) {
// no placeholder found, set offset to end of string
$offset = $len;
}
// subtract one, as we want to get before the placeholder or end of string
$offset -= 1;
// we got a tag name that we want to search for. escape any regex characters to prevent conflicts.
$term .= preg_quote(substr($tag, $i, $offset - $i + 1), '/');
// move $i on
$i = $offset;
}
}
return $term;
}
/**
* generate a regex fragment out of a match term
*
* @param string $term is the match term already generated by tag2matchterm
* @param bool $negate if true create a negative lookahead
*
* @return string generated regex fragment
*/
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;
}
}