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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
{
/**
* Returns the displayname for this module
*
* @return string
*/
public static function getName()
{
return _('Forenbeiträge');
}
/**
* Returns the filters that are displayed in the sidebar of the global search.
*
* @return array Filters for this class.
*/
public static function getFilters()
{
return ['semester'];
}
/**
* Transforms the search request into an sql statement, that provides the id (same as getId) as type and
* the object id, that is later passed to the filter.
*
* This function is required to make use of the mysql union parallelism
*
* @param string $search the input query string
* @param array $filter an array with search limiting filter information (e.g. 'category', 'semester', etc.)
* @return String SQL Query to discover elements for the search
*/
public static function getSQL($search, $filter, $limit)
{
$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;
}
/**
* Returns an array of information for the found element. Following informations (key: description) are necessary
*
* - name: The name of the object
* - url: The url to send the user to when he clicks the link
*
* Additional informations are:
*
* - additional: Subtitle for the hit
* - expand: Url if the user further expands the search
* - img: Avatar for the
*
* @param array $data
* @param string $search
* @return array
*/
public static function filter($data, $search)
{
$user = self::fromCache("user/{$data['user_id']}", function () use ($data) {
return User::findFull($data['user_id']);
});
$course = self::fromCache("range/{$data['seminar_id']}", function () use ($data) {
return Course::find($data['seminar_id']);
});
// Get name
$name = _('Ohne Titel');
if ($data['name']) {
$name = self::mark($data['name'], $search);
} elseif ($course) {
$name = htmlReady($course->getFullName());
}
// Get additional info
if ($user && !$data['anonymous']) {
$temp = $user->getFullName();
} else {
$temp = _('Anonym');
}
$additional = sprintf(
_('Beitrag von %1$s in %2$s'),
$temp,
$course ? $course->getFullName() : _('Ohne Titel')
);
// Clear content from blockquotes
$filtered_content = self::blockquote_filter($data['content']);
//in case the search query is found in either $name or $filtered_content (via direct_search), the result should be returned
if (mb_strpos($name, "<mark>") !== false || self::direct_search($filtered_content, $search)) {
$result = [
'id' => $data['topic_id'],
'name' => $name,
'url' => URLHelper::getURL(
"dispatch.php/course/forum/index/index/{$data['topic_id']}#{$data['topic_id']}",
['cid' => $data['seminar_id'], 'highlight_topic' => $data['topic_id']],
true
),
'img' => CourseAvatar::getAvatar($course->id)->getUrl(Avatar::MEDIUM),
'date' => strftime('%x', $data['chdate']),
'description' => self::mark($filtered_content, $search, true),
'additional' => htmlReady($additional),
'expand' => URLHelper::getURL('dispatch.php/course/forum/index/search', [
'cid' => $data['seminar_id'],
'backend' => 'search',
'searchfor' => $search,
'search_title' => 1,
'search_content' => 1,
'search_author' => 1
]),
'expandtext' => _('Im Forum dieser Veranstaltung suchen'),
'user' => $temp
];
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)
{
$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;
}
/**
* Enables fulltext (MATCH AGAINST) search by creating the corresponding indices.
*/
public static function enable()
{
DBManager::get()->exec("ALTER TABLE `forum_entries` ADD FULLTEXT INDEX globalsearch (`name`, `content`)");
}
/**
* Disables fulltext (MATCH AGAINST) search by removing the corresponding indices.
*/
public static function disable()
{
DBManager::get()->exec("DROP INDEX globalsearch ON `forum_entries`");
}
/**
* Returns the URL that can be called for a full search.
*
* @param string $searchterm what to search for?
* @return string URL to the full search, containing the searchterm and the category
*/
public static function getSearchURL($searchterm)
{
return URLHelper::getURL('dispatch.php/search/globalsearch', [
'q' => $searchterm,
'category' => self::class
]);
}
}
|
