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| <?php | |
| /** | |
| * | |
| * This file is part of the phpBB Forum Software package. | |
| * | |
| * @copyright (c) phpBB Limited <https://www.phpbb.com> | |
| * @license GNU General Public License, version 2 (GPL-2.0) | |
| * | |
| * For full copyright and license information, please see | |
| * the docs/CREDITS.txt file. | |
| * | |
| */ | |
| namespace phpbb\search; | |
| /** | |
| * @ignore | |
| */ | |
| define('SEARCH_RESULT_NOT_IN_CACHE', 0); | |
| define('SEARCH_RESULT_IN_CACHE', 1); | |
| define('SEARCH_RESULT_INCOMPLETE', 2); | |
| /** | |
| * optional base class for search plugins providing simple caching based on ACM | |
| * and functions to retrieve ignore_words and synonyms | |
| */ | |
| class base | |
| { | |
| var $ignore_words = array(); | |
| var $match_synonym = array(); | |
| var $replace_synonym = array(); | |
| function search_backend(&$error) | |
| { | |
| // This class cannot be used as a search plugin | |
| $error = true; | |
| } | |
| /** | |
| * Retrieves cached search results | |
| * | |
| * @param string $search_key an md5 string generated from all the passed search options to identify the results | |
| * @param int &$result_count will contain the number of all results for the search (not only for the current page) | |
| * @param array &$id_ary is filled with the ids belonging to the requested page that are stored in the cache | |
| * @param int &$start indicates the first index of the page | |
| * @param int $per_page number of ids each page is supposed to contain | |
| * @param string $sort_dir is either a or d representing ASC and DESC | |
| * | |
| * @return int SEARCH_RESULT_NOT_IN_CACHE or SEARCH_RESULT_IN_CACHE or SEARCH_RESULT_INCOMPLETE | |
| */ | |
| function obtain_ids($search_key, &$result_count, &$id_ary, &$start, $per_page, $sort_dir) | |
| { | |
| global $cache; | |
| if (!($stored_ids = $cache->get('_search_results_' . $search_key))) | |
| { | |
| // no search results cached for this search_key | |
| return SEARCH_RESULT_NOT_IN_CACHE; | |
| } | |
| else | |
| { | |
| $result_count = $stored_ids[-1]; | |
| $reverse_ids = ($stored_ids[-2] != $sort_dir) ? true : false; | |
| $complete = true; | |
| // Change start parameter in case out of bounds | |
| if ($result_count) | |
| { | |
| if ($start < 0) | |
| { | |
| $start = 0; | |
| } | |
| else if ($start >= $result_count) | |
| { | |
| $start = floor(($result_count - 1) / $per_page) * $per_page; | |
| } | |
| } | |
| // change the start to the actual end of the current request if the sort direction differs | |
| // from the dirction in the cache and reverse the ids later | |
| if ($reverse_ids) | |
| { | |
| $start = $result_count - $start - $per_page; | |
| // the user requested a page past the last index | |
| if ($start < 0) | |
| { | |
| return SEARCH_RESULT_NOT_IN_CACHE; | |
| } | |
| } | |
| for ($i = $start, $n = $start + $per_page; ($i < $n) && ($i < $result_count); $i++) | |
| { | |
| if (!isset($stored_ids[$i])) | |
| { | |
| $complete = false; | |
| } | |
| else | |
| { | |
| $id_ary[] = $stored_ids[$i]; | |
| } | |
| } | |
| unset($stored_ids); | |
| if ($reverse_ids) | |
| { | |
| $id_ary = array_reverse($id_ary); | |
| } | |
| if (!$complete) | |
| { | |
| return SEARCH_RESULT_INCOMPLETE; | |
| } | |
| return SEARCH_RESULT_IN_CACHE; | |
| } | |
| } | |
| /** | |
| * Caches post/topic ids | |
| * | |
| * @param string $search_key an md5 string generated from all the passed search options to identify the results | |
| * @param string $keywords contains the keywords as entered by the user | |
| * @param array $author_ary an array of author ids, if the author should be ignored during the search the array is empty | |
| * @param int $result_count contains the number of all results for the search (not only for the current page) | |
| * @param array &$id_ary contains a list of post or topic ids that shall be cached, the first element | |
| * must have the absolute index $start in the result set. | |
| * @param int $start indicates the first index of the page | |
| * @param string $sort_dir is either a or d representing ASC and DESC | |
| * | |
| * @return null | |
| */ | |
| function save_ids($search_key, $keywords, $author_ary, $result_count, &$id_ary, $start, $sort_dir) | |
| { | |
| global $cache, $config, $db, $user; | |
| $length = min(count($id_ary), $config['search_block_size']); | |
| // nothing to cache so exit | |
| if (!$length) | |
| { | |
| return; | |
| } | |
| $store_ids = array_slice($id_ary, 0, $length); | |
| // create a new resultset if there is none for this search_key yet | |
| // or add the ids to the existing resultset | |
| if (!($store = $cache->get('_search_results_' . $search_key))) | |
| { | |
| // add the current keywords to the recent searches in the cache which are listed on the search page | |
| if (!empty($keywords) || count($author_ary)) | |
| { | |
| $sql = 'SELECT search_time | |
| FROM ' . SEARCH_RESULTS_TABLE . ' | |
| WHERE search_key = \'' . $db->sql_escape($search_key) . '\''; | |
| $result = $db->sql_query($sql); | |
| if (!$db->sql_fetchrow($result)) | |
| { | |
| $sql_ary = array( | |
| 'search_key' => $search_key, | |
| 'search_time' => time(), | |
| 'search_keywords' => $keywords, | |
| 'search_authors' => ' ' . implode(' ', $author_ary) . ' ' | |
| ); | |
| $sql = 'INSERT INTO ' . SEARCH_RESULTS_TABLE . ' ' . $db->sql_build_array('INSERT', $sql_ary); | |
| $db->sql_query($sql); | |
| } | |
| $db->sql_freeresult($result); | |
| } | |
| $sql = 'UPDATE ' . USERS_TABLE . ' | |
| SET user_last_search = ' . time() . ' | |
| WHERE user_id = ' . $user->data['user_id']; | |
| $db->sql_query($sql); | |
| $store = array(-1 => $result_count, -2 => $sort_dir); | |
| $id_range = range($start, $start + $length - 1); | |
| } | |
| else | |
| { | |
| // we use one set of results for both sort directions so we have to calculate the indizes | |
| // for the reversed array and we also have to reverse the ids themselves | |
| if ($store[-2] != $sort_dir) | |
| { | |
| $store_ids = array_reverse($store_ids); | |
| $id_range = range($store[-1] - $start - $length, $store[-1] - $start - 1); | |
| } | |
| else | |
| { | |
| $id_range = range($start, $start + $length - 1); | |
| } | |
| } | |
| $store_ids = array_combine($id_range, $store_ids); | |
| // append the ids | |
| if (is_array($store_ids)) | |
| { | |
| $store += $store_ids; | |
| // if the cache is too big | |
| if (count($store) - 2 > 20 * $config['search_block_size']) | |
| { | |
| // remove everything in front of two blocks in front of the current start index | |
| for ($i = 0, $n = $id_range[0] - 2 * $config['search_block_size']; $i < $n; $i++) | |
| { | |
| if (isset($store[$i])) | |
| { | |
| unset($store[$i]); | |
| } | |
| } | |
| // remove everything after two blocks after the current stop index | |
| end($id_range); | |
| for ($i = $store[-1] - 1, $n = current($id_range) + 2 * $config['search_block_size']; $i > $n; $i--) | |
| { | |
| if (isset($store[$i])) | |
| { | |
| unset($store[$i]); | |
| } | |
| } | |
| } | |
| $cache->put('_search_results_' . $search_key, $store, $config['search_store_results']); | |
| $sql = 'UPDATE ' . SEARCH_RESULTS_TABLE . ' | |
| SET search_time = ' . time() . ' | |
| WHERE search_key = \'' . $db->sql_escape($search_key) . '\''; | |
| $db->sql_query($sql); | |
| } | |
| unset($store); | |
| unset($store_ids); | |
| unset($id_range); | |
| } | |
| /** | |
| * Removes old entries from the search results table and removes searches with keywords that contain a word in $words. | |
| */ | |
| function destroy_cache($words, $authors = false) | |
| { | |
| global $db, $cache, $config; | |
| // clear all searches that searched for the specified words | |
| if (count($words)) | |
| { | |
| $sql_where = ''; | |
| foreach ($words as $word) | |
| { | |
| $sql_where .= " OR search_keywords " . $db->sql_like_expression($db->get_any_char() . $word . $db->get_any_char()); | |
| } | |
| $sql = 'SELECT search_key | |
| FROM ' . SEARCH_RESULTS_TABLE . " | |
| WHERE search_keywords LIKE '%*%' $sql_where"; | |
| $result = $db->sql_query($sql); | |
| while ($row = $db->sql_fetchrow($result)) | |
| { | |
| $cache->destroy('_search_results_' . $row['search_key']); | |
| } | |
| $db->sql_freeresult($result); | |
| } | |
| // clear all searches that searched for the specified authors | |
| if (is_array($authors) && count($authors)) | |
| { | |
| $sql_where = ''; | |
| foreach ($authors as $author) | |
| { | |
| $sql_where .= (($sql_where) ? ' OR ' : '') . 'search_authors ' . $db->sql_like_expression($db->get_any_char() . ' ' . (int) $author . ' ' . $db->get_any_char()); | |
| } | |
| $sql = 'SELECT search_key | |
| FROM ' . SEARCH_RESULTS_TABLE . " | |
| WHERE $sql_where"; | |
| $result = $db->sql_query($sql); | |
| while ($row = $db->sql_fetchrow($result)) | |
| { | |
| $cache->destroy('_search_results_' . $row['search_key']); | |
| } | |
| $db->sql_freeresult($result); | |
| } | |
| $sql = 'DELETE | |
| FROM ' . SEARCH_RESULTS_TABLE . ' | |
| WHERE search_time < ' . (time() - (int) $config['search_store_results']); | |
| $db->sql_query($sql); | |
| } | |
| } |