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<?php
/**
* Handles Database Search
*/
declare(strict_types=1);
namespace PhpMyAdmin\Database;
use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\Template;
use PhpMyAdmin\Util;
use function array_intersect;
use function array_key_exists;
use function count;
use function explode;
use function htmlspecialchars;
use function implode;
use function intval;
use function is_array;
use function is_string;
use function strlen;
/**
* Class to handle database search
*/
class Search
{
/**
* Database name
*
* @access private
* @var string
*/
private $db;
/**
* Table Names
*
* @access private
* @var array
*/
private $tablesNamesOnly;
/**
* Type of search
*
* @access private
* @var array
*/
private $searchTypes;
/**
* Already set search type
*
* @access private
* @var int
*/
private $criteriaSearchType;
/**
* Already set search type's description
*
* @access private
* @var string
*/
private $searchTypeDescription;
/**
* Search string/regexp
*
* @access private
* @var string
*/
private $criteriaSearchString;
/**
* Criteria Tables to search in
*
* @access private
* @var array
*/
private $criteriaTables;
/**
* Restrict the search to this column
*
* @access private
* @var string
*/
private $criteriaColumnName;
/** @var DatabaseInterface */
private $dbi;
/** @var Template */
public $template;
/**
* @param DatabaseInterface $dbi DatabaseInterface object
* @param string $db Database name
* @param Template $template Template object
*/
public function __construct(DatabaseInterface $dbi, $db, Template $template)
{
$this->db = $db;
$this->dbi = $dbi;
$this->searchTypes = [
'1' => __('at least one of the words'),
'2' => __('all of the words'),
'3' => __('the exact phrase as substring'),
'4' => __('the exact phrase as whole field'),
'5' => __('as regular expression'),
];
$this->template = $template;
// Sets criteria parameters
$this->setSearchParams();
}
/**
* Sets search parameters
*
* @return void
*/
private function setSearchParams()
{
$this->tablesNamesOnly = $this->dbi->getTables($this->db);
if (empty($_POST['criteriaSearchType'])
|| ! is_string($_POST['criteriaSearchType'])
|| ! array_key_exists(
$_POST['criteriaSearchType'],
$this->searchTypes
)
) {
$this->criteriaSearchType = 1;
unset($_POST['submit_search']);
} else {
$this->criteriaSearchType = (int) $_POST['criteriaSearchType'];
$this->searchTypeDescription
= $this->searchTypes[$_POST['criteriaSearchType']];
}
if (empty($_POST['criteriaSearchString'])
|| ! is_string($_POST['criteriaSearchString'])
) {
$this->criteriaSearchString = '';
unset($_POST['submit_search']);
} else {
$this->criteriaSearchString = $_POST['criteriaSearchString'];
}
$this->criteriaTables = [];
if (empty($_POST['criteriaTables'])
|| ! is_array($_POST['criteriaTables'])
) {
unset($_POST['submit_search']);
} else {
$this->criteriaTables = array_intersect(
$_POST['criteriaTables'],
$this->tablesNamesOnly
);
}
if (empty($_POST['criteriaColumnName'])
|| ! is_string($_POST['criteriaColumnName'])
) {
unset($this->criteriaColumnName);
} else {
$this->criteriaColumnName = $this->dbi->escapeString(
$_POST['criteriaColumnName']
);
}
}
/**
* Builds the SQL search query
*
* @param string $table The table name
*
* @return array 3 SQL queries (for count, display and delete results)
*
* @todo can we make use of fulltextsearch IN BOOLEAN MODE for this?
* PMA_backquote
* DatabaseInterface::freeResult
* DatabaseInterface::fetchAssoc
* $GLOBALS['db']
* explode
* count
* strlen
*/
private function getSearchSqls($table)
{
// Statement types
$sqlstr_select = 'SELECT';
$sqlstr_delete = 'DELETE';
// Table to use
$sqlstr_from = ' FROM '
. Util::backquote($GLOBALS['db']) . '.'
. Util::backquote($table);
// Gets where clause for the query
$where_clause = $this->getWhereClause($table);
// Builds complete queries
$sql = [];
$sql['select_columns'] = $sqlstr_select . ' * ' . $sqlstr_from
. $where_clause;
// here, I think we need to still use the COUNT clause, even for
// VIEWs, anyway we have a WHERE clause that should limit results
$sql['select_count'] = $sqlstr_select . ' COUNT(*) AS `count`'
. $sqlstr_from . $where_clause;
$sql['delete'] = $sqlstr_delete . $sqlstr_from . $where_clause;
return $sql;
}
/**
* Provides where clause for building SQL query
*
* @param string $table The table name
*
* @return string The generated where clause
*/
private function getWhereClause($table)
{
// Columns to select
$allColumns = $this->dbi->getColumns($GLOBALS['db'], $table);
$likeClauses = [];
// Based on search type, decide like/regex & '%'/''
$like_or_regex = ($this->criteriaSearchType == 5 ? 'REGEXP' : 'LIKE');
$automatic_wildcard = ($this->criteriaSearchType < 4 ? '%' : '');
// For "as regular expression" (search option 5), LIKE won't be used
// Usage example: If user is searching for a literal $ in a regexp search,
// they should enter \$ as the value.
$criteriaSearchStringEscaped = $this->dbi->escapeString(
$this->criteriaSearchString
);
// Extract search words or pattern
$search_words = $this->criteriaSearchType > 2
? [$criteriaSearchStringEscaped]
: explode(' ', $criteriaSearchStringEscaped);
foreach ($search_words as $search_word) {
// Eliminates empty values
if (strlen($search_word) === 0) {
continue;
}
$likeClausesPerColumn = [];
// for each column in the table
foreach ($allColumns as $column) {
if (isset($this->criteriaColumnName)
&& strlen($this->criteriaColumnName) !== 0
&& $column['Field'] != $this->criteriaColumnName
) {
continue;
}
$column = 'CONVERT(' . Util::backquote($column['Field'])
. ' USING utf8)';
$likeClausesPerColumn[] = $column . ' ' . $like_or_regex . ' '
. "'"
. $automatic_wildcard . $search_word . $automatic_wildcard
. "'";
}
if (count($likeClausesPerColumn) <= 0) {
continue;
}
$likeClauses[] = implode(' OR ', $likeClausesPerColumn);
}
// Use 'OR' if 'at least one word' is to be searched, else use 'AND'
$implode_str = ($this->criteriaSearchType == 1 ? ' OR ' : ' AND ');
if (empty($likeClauses)) {
// this could happen when the "inside column" does not exist
// in any selected tables
$where_clause = ' WHERE FALSE';
} else {
$where_clause = ' WHERE ('
. implode(') ' . $implode_str . ' (', $likeClauses)
. ')';
}
return $where_clause;
}
/**
* Displays database search results
*
* @return string HTML for search results
*/
public function getSearchResults()
{
$resultTotal = 0;
$rows = [];
// For each table selected as search criteria
foreach ($this->criteriaTables as $eachTable) {
// Gets the SQL statements
$newSearchSqls = $this->getSearchSqls($eachTable);
// Executes the "COUNT" statement
$resultCount = intval($this->dbi->fetchValue(
$newSearchSqls['select_count']
));
$resultTotal += $resultCount;
// Gets the result row's HTML for a table
$rows[] = [
'table' => htmlspecialchars($eachTable),
'new_search_sqls' => $newSearchSqls,
'result_count' => $resultCount,
];
}
return $this->template->render('database/search/results', [
'db' => $this->db,
'rows' => $rows,
'result_total' => $resultTotal,
'criteria_tables' => $this->criteriaTables,
'criteria_search_string' => htmlspecialchars($this->criteriaSearchString),
'search_type_description' => $this->searchTypeDescription,
]);
}
/**
* Provides the main search form's html
*
* @return string HTML for selection form
*/
public function getMainHtml()
{
return $this->template->render('database/search/main', [
'db' => $this->db,
'criteria_search_string' => $this->criteriaSearchString,
'criteria_search_type' => $this->criteriaSearchType,
'criteria_tables' => $this->criteriaTables,
'tables_names_only' => $this->tablesNamesOnly,
'criteria_column_name' => $this->criteriaColumnName ?? null,
]);
}
}
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