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<?php
/**
* GlobalSearchModule for forum entries
*
* @author Thomas Hackl <thomas.hackl@uni-passau.de>
* @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
* @category Stud.IP
* @since 4.1
*/
class GlobalSearchForum extends GlobalSearchModule implements GlobalSearchFulltext
{
/**
* @inheritDoc
*/
public static function getName(): string
{
return _('Forenbeiträge');
}
/**
* @inheritDoc
*/
public static function getFilters(): array
{
return ['semester'];
}
/**
* @inheritDoc
*/
public static function getSQL($search, $filter, $limit): string
{
$search = str_replace(" ", "% ", $search);
$query = DBManager::get()->quote("%$search%");
// visibility
$seminaruser = '';
if (!$GLOBALS['perm']->have_perm('admin')) {
$seminaruser = " AND EXISTS (
SELECT 1 FROM `seminar_user`
WHERE `forum_postings`.`range_id` = `seminar_user`.`seminar_id`
AND `seminar_user`.`user_id` = " . DBManager::get()->quote($GLOBALS['user']->id) . "
) ";
}
// generate SQL condition for the semester filter in the sidebar
$semester_condition = '';
if (
!empty($filter['category'])
&& in_array($filter['category'], [self::class, 'show_all_categories'])
) {
if (!empty($filter['semester'])) {
if ($filter['semester'] === 'future') {
$semester = Semester::findCurrent();
$next_semester = Semester::findNext();
$semester_end = $next_semester ? $next_semester->ende : $semester->ende;
} else {
$semester = Semester::findByTimestamp($filter['semester']);
$semester_end = $semester->ende;
}
$semester_condition = " AND (`mkdate` >= " . DBManager::get()->quote($semester['beginn']) .
" AND `mkdate` <= " . DBManager::get()->quote($semester_end) . ") ";
}
}
// anonymous postings
if (!$GLOBALS['perm']->have_perm('root') && Config::get()->FORUM_ANONYMOUS_POSTINGS) {
$anonymous = "`anonymous` = 0 AND";
} else {
$anonymous = "";
}
$sql = "SELECT SQL_CALC_FOUND_ROWS `forum_postings`.*
FROM `forum_postings`
WHERE {$anonymous} (
`content` LIKE {$query}
)
{$semester_condition}
{$seminaruser}
ORDER BY `chdate` DESC
LIMIT " . $limit;
return $sql;
}
/**
* @inheritDoc
*/
public static function filter($data, $search): array
{
$user = self::fromCache("user/{$data['user_id']}", function () use ($data) {
return User::findFull($data['user_id']);
});
$range = self::fromCache("range/{$data['range_id']}", function () use ($data) {
return get_object_by_range_id($data['range_id']);
});
// Get posts author name
if (!$user) {
$author_name = _('Unbekannt');
} else if ($user->id !== User::findCurrent()->id && $data['anonymous']) {
$author_name = _('Anonym');
} else {
$author_name = self::mark($user->getFullName(), $search);
}
// Get additional info
$additional = sprintf(
_('Beitrag von %1$s in %2$s'),
$author_name,
$range->getFullName()
);
// Clear content from blockquotes
$filtered_content = self::blockquote_filter($data['content']);
$range_avatar = match (get_class($range)) {
Institute::class => InstituteAvatar::getAvatar($range->id)->getURL(Avatar::NORMAL),
Course::class => CourseAvatar::getAvatar($range->id)->getURL(Avatar::NORMAL)
};
//in case the search query is found in either $author_name or $filtered_content (via direct_search), the result should be returned
if (mb_strpos($author_name, "<mark>") !== false || self::direct_search($filtered_content, $search)) {
$result = [
'id' => $data['posting_id'],
'name' => $author_name,
'url' => URLHelper::getURL(
"dispatch.php/course/forum/discussions/show/{$data['discussion_id']}#post_{$data['posting_id']}",
['cid' => $range->id, 'q' => $search],
true
),
'img' => $range_avatar,
'date' => strftime('%x', $data['chdate']),
'description' => self::mark($filtered_content, $search, true),
'additional' => htmlReady($additional),
'expand' => URLHelper::getURL('dispatch.php/course/forum/search', [
'cid' => $range->id,
'q' => $search
]),
'expandtext' => _('Im Forum dieser Veranstaltung suchen'),
];
return $result;
}
return [];
}
/**
* Looks for blockquote and removes it from content in recursive mode
*
* @param string $content data content
* @return string purified content (without blockquote)
*/
public static function blockquote_filter($content): string
{
$beg = '<blockquote>';
$end = '</blockquote>';
$beg_pos = mb_strpos($content, $beg);
$end_pos = mb_strpos($content, $end);
if ($beg_pos === false || $end_pos === false) {
return $content;
}
$quote = mb_substr($content, $beg_pos, ($end_pos + mb_strlen($end)) - $beg_pos);
$most_inner_element = mb_substr($quote, mb_strrpos($quote, $beg), (mb_strpos($quote, $end) + mb_strlen($end)) - mb_strrpos($quote, $beg));
//recursive call!
return self::blockquote_filter(str_replace($most_inner_element, '', $content));
}
/**
* Search the query directly inside the string
*
* @param string $string text to be searched
* @param string $query query to be found
*
* @return boolean $found in case of finding true, otherwise false
*/
public static function direct_search($string, $query)
{
$found = false;
$string = strip_tags($string);
$query = trim($query);
$quoted = preg_quote($query, '/');
if (preg_match("/{$quoted}/Si", $string)) {
$found = true;
}
return $found;
}
/**
* @inheritDoc
*/
public static function enable(): void
{
DBManager::get()->exec("ALTER TABLE `forum_postings` ADD FULLTEXT INDEX globalsearch (`content`)");
}
/**
* @inheritDoc
*/
public static function disable(): void
{
DBManager::get()->exec("DROP INDEX globalsearch ON `forum_postings`");
}
/**
* @inheritDoc
*/
public static function getSearchURL($searchterm): string
{
return URLHelper::getURL('dispatch.php/search/globalsearch', [
'q' => $searchterm,
'category' => self::class
]);
}
}
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