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<?php
/**
* Tracking changes on databases, tables and views
*/
declare(strict_types=1);
namespace PhpMyAdmin;
use PhpMyAdmin\Plugins\Export\ExportSql;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Statements\AlterStatement;
use PhpMyAdmin\SqlParser\Statements\CreateStatement;
use PhpMyAdmin\SqlParser\Statements\DeleteStatement;
use PhpMyAdmin\SqlParser\Statements\DropStatement;
use PhpMyAdmin\SqlParser\Statements\InsertStatement;
use PhpMyAdmin\SqlParser\Statements\RenameStatement;
use PhpMyAdmin\SqlParser\Statements\TruncateStatement;
use PhpMyAdmin\SqlParser\Statements\UpdateStatement;
use function array_values;
use function count;
use function explode;
use function is_array;
use function mb_strpos;
use function mb_strstr;
use function mb_substr;
use function preg_quote;
use function preg_replace;
use function rtrim;
use function serialize;
use function str_replace;
use function strtotime;
use function substr;
use function trim;
/**
* This class tracks changes on databases, tables and views.
*
* @todo use stristr instead of strstr
*/
class Tracker
{
/**
* Whether tracking is ready.
*
* @var bool
*/
protected static $enabled = false;
/**
* Cache to avoid quering tracking status multiple times.
*
* @var array
*/
protected static $trackingCache = [];
/**
* Actually enables tracking. This needs to be done after all
* underlaying code is initialized.
*
* @return void
*
* @static
*/
public static function enable()
{
self::$enabled = true;
}
/**
* Gets the on/off value of the Tracker module, starts initialization.
*
* @return bool (true=on|false=off)
*
* @static
*/
public static function isActive()
{
global $dbi;
if (! self::$enabled) {
return false;
}
/* We need to avoid attempt to track any queries
* from Relation::getRelationsParam
*/
self::$enabled = false;
$relation = new Relation($dbi);
$cfgRelation = $relation->getRelationsParam();
/* Restore original state */
self::$enabled = true;
if (! $cfgRelation['trackingwork']) {
return false;
}
$pma_table = self::getTrackingTable();
return $pma_table !== null;
}
/**
* Parses the name of a table from a SQL statement substring.
*
* @param string $string part of SQL statement
*
* @return string the name of table
*
* @static
*/
protected static function getTableName($string)
{
if (mb_strstr($string, '.')) {
$temp = explode('.', $string);
$tablename = $temp[1];
} else {
$tablename = $string;
}
$str = explode("\n", $tablename);
$tablename = $str[0];
$tablename = str_replace([';', '`'], '', $tablename);
$tablename = trim($tablename);
return $tablename;
}
/**
* Gets the tracking status of a table, is it active or disabled ?
*
* @param string $dbname name of database
* @param string $tablename name of table
*
* @return bool true or false
*
* @static
*/
public static function isTracked($dbname, $tablename)
{
global $dbi;
if (! self::$enabled) {
return false;
}
if (isset(self::$trackingCache[$dbname][$tablename])) {
return self::$trackingCache[$dbname][$tablename];
}
/* We need to avoid attempt to track any queries
* from Relation::getRelationsParam
*/
self::$enabled = false;
$relation = new Relation($dbi);
$cfgRelation = $relation->getRelationsParam();
/* Restore original state */
self::$enabled = true;
if (! $cfgRelation['trackingwork']) {
return false;
}
$sql_query = ' SELECT tracking_active FROM ' . self::getTrackingTable() .
" WHERE db_name = '" . $dbi->escapeString($dbname) . "' " .
" AND table_name = '" . $dbi->escapeString($tablename) . "' " .
' ORDER BY version DESC LIMIT 1';
$result = $dbi->fetchValue($sql_query, 0, 0, DatabaseInterface::CONNECT_CONTROL) == 1;
self::$trackingCache[$dbname][$tablename] = $result;
return $result;
}
/**
* Returns the comment line for the log.
*
* @return string Comment, contains date and username
*/
public static function getLogComment()
{
$date = Util::date('Y-m-d H:i:s');
$user = preg_replace('/\s+/', ' ', $GLOBALS['cfg']['Server']['user']);
return '# log ' . $date . ' ' . $user . "\n";
}
/**
* Creates tracking version of a table / view
* (in other words: create a job to track future changes on the table).
*
* @param string $dbname name of database
* @param string $tablename name of table
* @param string $version version
* @param string $tracking_set set of tracking statements
* @param bool $is_view if table is a view
*
* @return int result of version insertion
*
* @static
*/
public static function createVersion(
$dbname,
$tablename,
$version,
$tracking_set = '',
bool $is_view = false
) {
global $sql_backquotes, $export_type, $dbi;
$relation = new Relation($dbi);
if ($tracking_set == '') {
$tracking_set
= $GLOBALS['cfg']['Server']['tracking_default_statements'];
}
/**
* get Export SQL instance
*
* @var ExportSql $export_sql_plugin
*/
$export_sql_plugin = Plugins::getPlugin(
'export',
'sql',
'libraries/classes/Plugins/Export/',
[
'export_type' => $export_type,
'single_table' => false,
]
);
$sql_backquotes = true;
$date = Util::date('Y-m-d H:i:s');
// Get data definition snapshot of table
$columns = $dbi->getColumns($dbname, $tablename, null, true);
// int indices to reduce size
$columns = array_values($columns);
// remove Privileges to reduce size
for ($i = 0, $nb = count($columns); $i < $nb; $i++) {
unset($columns[$i]['Privileges']);
}
$indexes = $dbi->getTableIndexes($dbname, $tablename);
$snapshot = [
'COLUMNS' => $columns,
'INDEXES' => $indexes,
];
$snapshot = serialize($snapshot);
// Get DROP TABLE / DROP VIEW and CREATE TABLE SQL statements
$sql_backquotes = true;
$create_sql = '';
if ($GLOBALS['cfg']['Server']['tracking_add_drop_table'] == true
&& $is_view === false
) {
$create_sql .= self::getLogComment()
. 'DROP TABLE IF EXISTS ' . Util::backquote($tablename) . ";\n";
}
if ($GLOBALS['cfg']['Server']['tracking_add_drop_view'] == true
&& $is_view === true
) {
$create_sql .= self::getLogComment()
. 'DROP VIEW IF EXISTS ' . Util::backquote($tablename) . ";\n";
}
$create_sql .= self::getLogComment() .
$export_sql_plugin->getTableDef($dbname, $tablename, "\n", '');
// Save version
$sql_query = "/*NOTRACK*/\n" .
'INSERT INTO ' . self::getTrackingTable() . ' (' .
'db_name, ' .
'table_name, ' .
'version, ' .
'date_created, ' .
'date_updated, ' .
'schema_snapshot, ' .
'schema_sql, ' .
'data_sql, ' .
'tracking ' .
') ' .
"values (
'" . $dbi->escapeString($dbname) . "',
'" . $dbi->escapeString($tablename) . "',
'" . $dbi->escapeString($version) . "',
'" . $dbi->escapeString($date) . "',
'" . $dbi->escapeString($date) . "',
'" . $dbi->escapeString($snapshot) . "',
'" . $dbi->escapeString($create_sql) . "',
'" . $dbi->escapeString("\n") . "',
'" . $dbi->escapeString($tracking_set)
. "' )";
$result = $relation->queryAsControlUser($sql_query);
if ($result) {
// Deactivate previous version
self::deactivateTracking($dbname, $tablename, (int) $version - 1);
}
return $result;
}
/**
* Removes all tracking data for a table or a version of a table
*
* @param string $dbname name of database
* @param string $tablename name of table
* @param string $version version
*
* @return int result of version insertion
*
* @static
*/
public static function deleteTracking($dbname, $tablename, $version = '')
{
global $dbi;
$relation = new Relation($dbi);
$sql_query = "/*NOTRACK*/\n"
. 'DELETE FROM ' . self::getTrackingTable()
. " WHERE `db_name` = '"
. $dbi->escapeString($dbname) . "'"
. " AND `table_name` = '"
. $dbi->escapeString($tablename) . "'";
if ($version) {
$sql_query .= " AND `version` = '"
. $dbi->escapeString($version) . "'";
}
return $relation->queryAsControlUser($sql_query);
}
/**
* Creates tracking version of a database
* (in other words: create a job to track future changes on the database).
*
* @param string $dbname name of database
* @param string $version version
* @param string $query query
* @param string $tracking_set set of tracking statements
*
* @return int result of version insertion
*
* @static
*/
public static function createDatabaseVersion(
$dbname,
$version,
$query,
$tracking_set = 'CREATE DATABASE,ALTER DATABASE,DROP DATABASE'
) {
global $dbi;
$relation = new Relation($dbi);
$date = Util::date('Y-m-d H:i:s');
if ($tracking_set == '') {
$tracking_set
= $GLOBALS['cfg']['Server']['tracking_default_statements'];
}
$create_sql = '';
if ($GLOBALS['cfg']['Server']['tracking_add_drop_database'] == true) {
$create_sql .= self::getLogComment()
. 'DROP DATABASE IF EXISTS ' . Util::backquote($dbname) . ";\n";
}
$create_sql .= self::getLogComment() . $query;
// Save version
$sql_query = "/*NOTRACK*/\n" .
'INSERT INTO ' . self::getTrackingTable() . ' (' .
'db_name, ' .
'table_name, ' .
'version, ' .
'date_created, ' .
'date_updated, ' .
'schema_snapshot, ' .
'schema_sql, ' .
'data_sql, ' .
'tracking ' .
') ' .
"values (
'" . $dbi->escapeString($dbname) . "',
'" . $dbi->escapeString('') . "',
'" . $dbi->escapeString($version) . "',
'" . $dbi->escapeString($date) . "',
'" . $dbi->escapeString($date) . "',
'" . $dbi->escapeString('') . "',
'" . $dbi->escapeString($create_sql) . "',
'" . $dbi->escapeString("\n") . "',
'" . $dbi->escapeString($tracking_set)
. "' )";
return $relation->queryAsControlUser($sql_query);
}
/**
* Changes tracking of a table.
*
* @param string $dbname name of database
* @param string $tablename name of table
* @param string $version version
* @param int $new_state the new state of tracking
*
* @return int result of SQL query
*
* @static
*/
private static function changeTracking(
$dbname,
$tablename,
$version,
$new_state
) {
global $dbi;
$relation = new Relation($dbi);
$sql_query = ' UPDATE ' . self::getTrackingTable() .
" SET `tracking_active` = '" . $new_state . "' " .
" WHERE `db_name` = '" . $dbi->escapeString($dbname) . "' " .
" AND `table_name` = '" . $dbi->escapeString($tablename) . "' " .
" AND `version` = '" . $dbi->escapeString((string) $version) . "' ";
return $relation->queryAsControlUser($sql_query);
}
/**
* Changes tracking data of a table.
*
* @param string $dbname name of database
* @param string $tablename name of table
* @param string $version version
* @param string $type type of data(DDL || DML)
* @param string|array $new_data the new tracking data
*
* @return bool result of change
*
* @static
*/
public static function changeTrackingData(
$dbname,
$tablename,
$version,
$type,
$new_data
) {
global $dbi;
$relation = new Relation($dbi);
if ($type === 'DDL') {
$save_to = 'schema_sql';
} elseif ($type === 'DML') {
$save_to = 'data_sql';
} else {
return false;
}
$date = Util::date('Y-m-d H:i:s');
$new_data_processed = '';
if (is_array($new_data)) {
foreach ($new_data as $data) {
$new_data_processed .= '# log ' . $date . ' ' . $data['username']
. $dbi->escapeString($data['statement']) . "\n";
}
} else {
$new_data_processed = $new_data;
}
$sql_query = ' UPDATE ' . self::getTrackingTable() .
' SET `' . $save_to . "` = '" . $new_data_processed . "' " .
" WHERE `db_name` = '" . $dbi->escapeString($dbname) . "' " .
" AND `table_name` = '" . $dbi->escapeString($tablename) . "' " .
" AND `version` = '" . $dbi->escapeString($version) . "' ";
$result = $relation->queryAsControlUser($sql_query);
return (bool) $result;
}
/**
* Activates tracking of a table.
*
* @param string $dbname name of database
* @param string $tablename name of table
* @param string $version version
*
* @return int result of SQL query
*
* @static
*/
public static function activateTracking($dbname, $tablename, $version)
{
return self::changeTracking($dbname, $tablename, $version, 1);
}
/**
* Deactivates tracking of a table.
*
* @param string $dbname name of database
* @param string $tablename name of table
* @param string $version version
*
* @return int result of SQL query
*
* @static
*/
public static function deactivateTracking($dbname, $tablename, $version)
{
return self::changeTracking($dbname, $tablename, $version, 0);
}
/**
* Gets the newest version of a tracking job
* (in other words: gets the HEAD version).
*
* @param string $dbname name of database
* @param string $tablename name of table
* @param string $statement tracked statement
*
* @return int (-1 if no version exists | > 0 if a version exists)
*
* @static
*/
public static function getVersion(string $dbname, string $tablename, ?string $statement = null)
{
/** @var DatabaseInterface $dbi */
global $dbi;
$relation = new Relation($dbi);
$sql_query = ' SELECT MAX(version) FROM ' . self::getTrackingTable() .
" WHERE `db_name` = '" . $dbi->escapeString($dbname) . "' " .
" AND `table_name` = '" . $dbi->escapeString($tablename) . "' ";
if ($statement != '') {
$sql_query .= " AND FIND_IN_SET('"
. $statement . "',tracking) > 0";
}
$result = $relation->queryAsControlUser($sql_query, false);
if ($result === false) {
return -1;
}
$row = $dbi->fetchArray($result);
return $row[0] ?? -1;
}
/**
* Gets the record of a tracking job.
*
* @param string $dbname name of database
* @param string $tablename name of table
* @param string $version version number
*
* @return mixed record DDM log, DDL log, structure snapshot, tracked
* statements.
*
* @static
*/
public static function getTrackedData($dbname, $tablename, $version)
{
global $dbi;
$relation = new Relation($dbi);
$sql_query = ' SELECT * FROM ' . self::getTrackingTable() .
" WHERE `db_name` = '" . $dbi->escapeString($dbname) . "' ";
if (! empty($tablename)) {
$sql_query .= " AND `table_name` = '"
. $dbi->escapeString($tablename) . "' ";
}
$sql_query .= " AND `version` = '" . $dbi->escapeString($version)
. "' ORDER BY `version` DESC LIMIT 1";
$mixed = $dbi->fetchAssoc($relation->queryAsControlUser($sql_query));
// PHP 7.4 fix for accessing array offset on null
if (! is_array($mixed)) {
$mixed = [
'schema_sql' => null,
'data_sql' => null,
'tracking' => null,
'schema_snapshot' => null,
];
}
// Parse log
$log_schema_entries = explode('# log ', (string) $mixed['schema_sql']);
$log_data_entries = explode('# log ', (string) $mixed['data_sql']);
$ddl_date_from = $date = Util::date('Y-m-d H:i:s');
$ddlog = [];
$first_iteration = true;
// Iterate tracked data definition statements
// For each log entry we want to get date, username and statement
foreach ($log_schema_entries as $log_entry) {
if (trim($log_entry) == '') {
continue;
}
$date = mb_substr($log_entry, 0, 19);
$username = mb_substr(
$log_entry,
20,
mb_strpos($log_entry, "\n") - 20
);
if ($first_iteration) {
$ddl_date_from = $date;
$first_iteration = false;
}
$statement = rtrim((string) mb_strstr($log_entry, "\n"));
$ddlog[] = [
'date' => $date,
'username' => $username,
'statement' => $statement,
];
}
$date_from = $ddl_date_from;
$ddl_date_to = $date;
$dml_date_from = $date_from;
$dmlog = [];
$first_iteration = true;
// Iterate tracked data manipulation statements
// For each log entry we want to get date, username and statement
foreach ($log_data_entries as $log_entry) {
if (trim($log_entry) == '') {
continue;
}
$date = mb_substr($log_entry, 0, 19);
$username = mb_substr(
$log_entry,
20,
mb_strpos($log_entry, "\n") - 20
);
if ($first_iteration) {
$dml_date_from = $date;
$first_iteration = false;
}
$statement = rtrim((string) mb_strstr($log_entry, "\n"));
$dmlog[] = [
'date' => $date,
'username' => $username,
'statement' => $statement,
];
}
$dml_date_to = $date;
// Define begin and end of date range for both logs
$data = [];
if (strtotime($ddl_date_from) <= strtotime($dml_date_from)) {
$data['date_from'] = $ddl_date_from;
} else {
$data['date_from'] = $dml_date_from;
}
if (strtotime($ddl_date_to) >= strtotime($dml_date_to)) {
$data['date_to'] = $ddl_date_to;
} else {
$data['date_to'] = $dml_date_to;
}
$data['ddlog'] = $ddlog;
$data['dmlog'] = $dmlog;
$data['tracking'] = $mixed['tracking'];
$data['schema_snapshot'] = $mixed['schema_snapshot'];
return $data;
}
/**
* Parses a query. Gets
* - statement identifier (UPDATE, ALTER TABLE, ...)
* - type of statement, is it part of DDL or DML ?
* - tablename
*
* @param string $query query
*
* @return array containing identifier, type and tablename.
*
* @static
* @todo: using PMA SQL Parser when possible
* @todo: support multi-table/view drops
*/
public static function parseQuery($query): array
{
// Usage of PMA_SQP does not work here
//
// require_once("libraries/sqlparser.lib.php");
// $parsed_sql = PMA_SQP_parse($query);
// $sql_info = PMA_SQP_analyze($parsed_sql);
$parser = new Parser($query);
$tokens = $parser->list->tokens;
// Parse USE statement, need it for SQL dump imports
if ($tokens[0]->value === 'USE') {
$GLOBALS['db'] = $tokens[2]->value;
}
$result = [];
if (! empty($parser->statements)) {
$statement = $parser->statements[0];
$options = isset($statement->options) ? $statement->options->options : null;
/*
* DDL statements
*/
$result['type'] = 'DDL';
// Parse CREATE statement
if ($statement instanceof CreateStatement) {
if (empty($options) || ! isset($options[6])) {
return $result;
}
if ($options[6] === 'VIEW' || $options[6] === 'TABLE') {
$result['identifier'] = 'CREATE ' . $options[6];
$result['tablename'] = $statement->name !== null ? $statement->name->table : null;
} elseif ($options[6] === 'DATABASE') {
$result['identifier'] = 'CREATE DATABASE';
$result['tablename'] = '';
// In case of CREATE DATABASE, database field of the CreateStatement is the name of the database
$GLOBALS['db'] = $statement->name !== null ? $statement->name->database : null;
} elseif ($options[6] === 'INDEX'
|| $options[6] === 'UNIQUE INDEX'
|| $options[6] === 'FULLTEXT INDEX'
|| $options[6] === 'SPATIAL INDEX'
) {
$result['identifier'] = 'CREATE INDEX';
// In case of CREATE INDEX, we have to get the table name from body of the statement
$result['tablename'] = $statement->body[3]->value === '.' ? $statement->body[4]->value
: $statement->body[2]->value;
}
} elseif ($statement instanceof AlterStatement) { // Parse ALTER statement
if (empty($options) || ! isset($options[3])) {
return $result;
}
if ($options[3] === 'VIEW' || $options[3] === 'TABLE') {
$result['identifier'] = 'ALTER ' . $options[3];
$result['tablename'] = $statement->table->table;
} elseif ($options[3] === 'DATABASE') {
$result['identifier'] = 'ALTER DATABASE';
$result['tablename'] = '';
$GLOBALS['db'] = $statement->table->table;
}
} elseif ($statement instanceof DropStatement) { // Parse DROP statement
if (empty($options) || ! isset($options[1])) {
return $result;
}
if ($options[1] === 'VIEW' || $options[1] === 'TABLE') {
$result['identifier'] = 'DROP ' . $options[1];
$result['tablename'] = $statement->fields[0]->table;
} elseif ($options[1] === 'DATABASE') {
$result['identifier'] = 'DROP DATABASE';
$result['tablename'] = '';
$GLOBALS['db'] = $statement->fields[0]->table;
} elseif ($options[1] === 'INDEX') {
$result['identifier'] = 'DROP INDEX';
$result['tablename'] = $statement->table->table;
}
} elseif ($statement instanceof RenameStatement) { // Parse RENAME statement
$result['identifier'] = 'RENAME TABLE';
$result['tablename'] = $statement->renames[0]->old->table;
$result['tablename_after_rename'] = $statement->renames[0]->new->table;
}
if (isset($result['identifier'])) {
return $result;
}
/*
* DML statements
*/
$result['type'] = 'DML';
// Parse UPDATE statement
if ($statement instanceof UpdateStatement) {
$result['identifier'] = 'UPDATE';
$result['tablename'] = $statement->tables[0]->table;
}
// Parse INSERT INTO statement
if ($statement instanceof InsertStatement) {
$result['identifier'] = 'INSERT';
$result['tablename'] = $statement->into->dest->table;
}
// Parse DELETE statement
if ($statement instanceof DeleteStatement) {
$result['identifier'] = 'DELETE';
$result['tablename'] = $statement->from[0]->table;
}
// Parse TRUNCATE statement
if ($statement instanceof TruncateStatement) {
$result['identifier'] = 'TRUNCATE';
$result['tablename'] = $statement->table->table;
}
}
return $result;
}
/**
* Analyzes a given SQL statement and saves tracking data.
*
* @param string $query a SQL query
*
* @return void
*
* @static
*/
public static function handleQuery($query)
{
global $dbi;
$relation = new Relation($dbi);
// If query is marked as untouchable, leave
if (mb_strstr($query, '/*NOTRACK*/')) {
return;
}
if (! (substr($query, -1) === ';')) {
$query .= ";\n";
}
// Get some information about query
$result = self::parseQuery($query);
// Get database name
$dbname = trim($GLOBALS['db'] ?? '', '`');
// $dbname can be empty, for example when coming from Synchronize
// and this is a query for the remote server
if (empty($dbname)) {
return;
}
// If we found a valid statement
if (! isset($result['identifier'])) {
return;
}
// The table name was not found, see issue: #16837 as an example
// Also checks if the value is not null
if (! isset($result['tablename'])) {
return;
}
$version = self::getVersion(
$dbname,
$result['tablename'],
$result['identifier']
);
// If version not exists and auto-creation is enabled
if ($GLOBALS['cfg']['Server']['tracking_version_auto_create'] == true
&& $version == -1
) {
// Create the version
switch ($result['identifier']) {
case 'CREATE TABLE':
self::createVersion($dbname, $result['tablename'], '1');
break;
case 'CREATE VIEW':
self::createVersion(
$dbname,
$result['tablename'],
'1',
'',
true
);
break;
case 'CREATE DATABASE':
self::createDatabaseVersion($dbname, '1', $query);
break;
}
}
// If version exists
if ($version == -1) {
return;
}
if (! self::isTracked($dbname, $result['tablename'])) {
return;
}
if ($result['type'] === 'DDL') {
$save_to = 'schema_sql';
} elseif ($result['type'] === 'DML') {
$save_to = 'data_sql';
} else {
$save_to = '';
}
$date = Util::date('Y-m-d H:i:s');
// Cut off `dbname`. from query
$query = preg_replace(
'/`' . preg_quote($dbname, '/') . '`\s?\./',
'',
$query
);
// Add log information
$query = self::getLogComment() . $query;
// Mark it as untouchable
$sql_query = " /*NOTRACK*/\n"
. ' UPDATE ' . self::getTrackingTable()
. ' SET ' . Util::backquote($save_to)
. ' = CONCAT( ' . Util::backquote($save_to) . ",'\n"
. $dbi->escapeString($query) . "') ,"
. " `date_updated` = '" . $date . "' ";
// If table was renamed we have to change
// the tablename attribute in pma_tracking too
if ($result['identifier'] === 'RENAME TABLE') {
$sql_query .= ', `table_name` = \''
. $dbi->escapeString($result['tablename_after_rename'])
. '\' ';
}
// Save the tracking information only for
// 1. the database
// 2. the table / view
// 3. the statements
// we want to track
$sql_query .=
" WHERE FIND_IN_SET('" . $result['identifier'] . "',tracking) > 0" .
" AND `db_name` = '" . $dbi->escapeString($dbname ?? '') . "' " .
" AND `table_name` = '"
. $dbi->escapeString($result['tablename']) . "' " .
" AND `version` = '" . $dbi->escapeString($version ?? '') . "' ";
$relation->queryAsControlUser($sql_query);
}
/**
* Returns the tracking table
*
* @return string tracking table
*/
private static function getTrackingTable()
{
global $dbi;
$relation = new Relation($dbi);
$cfgRelation = $relation->getRelationsParam();
return Util::backquote($cfgRelation['db'])
. '.' . Util::backquote($cfgRelation['tracking']);
}
}
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