nextcloud/lib/db.php

807 lines
23 KiB
PHP

<?php
/**
* ownCloud
*
* @author Frank Karlitschek
* @copyright 2012 Frank Karlitschek frank@owncloud.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
define('MDB2_SCHEMA_DUMP_STRUCTURE', '1');
class DatabaseException extends Exception {
private $query;
public function __construct($message, $query) {
parent::__construct($message);
$this->query = $query;
}
public function getQuery() {
return $this->query;
}
}
/**
* This class manages the access to the database. It basically is a wrapper for
* Doctrine with some adaptions.
*/
class OC_DB {
const BACKEND_DOCTRINE=2;
static private $preparedQueries = array();
static private $cachingEnabled = true;
/**
* @var \Doctrine\DBAL\Connection
*/
static private $connection; //the prefered connection to use, only Doctrine
static private $backend=null;
/**
* @var Doctrine
*/
static private $DOCTRINE=null;
static private $inTransaction=false;
static private $prefix=null;
static private $type=null;
/**
* check which backend we should use
* @return int BACKEND_DOCTRINE
*/
private static function getDBBackend() {
return self::BACKEND_DOCTRINE;
}
/**
* @brief connects to the database
* @param int $backend
* @return bool true if connection can be established or false on error
*
* Connects to the database as specified in config.php
*/
public static function connect($backend=null) {
if(self::$connection) {
return true;
}
if(is_null($backend)) {
$backend=self::getDBBackend();
}
if($backend==self::BACKEND_DOCTRINE) {
$success = self::connectDoctrine();
self::$connection=self::$DOCTRINE;
self::$backend=self::BACKEND_DOCTRINE;
}
return $success;
}
/**
* connect to the database using doctrine
*
* @return bool
*/
public static function connectDoctrine() {
if(self::$connection) {
if(self::$backend!=self::BACKEND_DOCTRINE) {
self::disconnect();
} else {
return true;
}
}
self::$preparedQueries = array();
// The global data we need
$name = OC_Config::getValue( "dbname", "owncloud" );
$host = OC_Config::getValue( "dbhost", "" );
$user = OC_Config::getValue( "dbuser", "" );
$pass = OC_Config::getValue( "dbpassword", "" );
$type = OC_Config::getValue( "dbtype", "sqlite" );
if(strpos($host, ':')) {
list($host, $port)=explode(':', $host, 2);
} else {
$port=false;
}
// do nothing if the connection already has been established
if(!self::$DOCTRINE) {
$config = new \Doctrine\DBAL\Configuration();
switch($type) {
case 'sqlite':
case 'sqlite3':
$datadir=OC_Config::getValue( "datadirectory", OC::$SERVERROOT.'/data' );
$connectionParams = array(
'user' => $user,
'password' => $pass,
'path' => $datadir.'/'.$name.'.db',
'driver' => 'pdo_sqlite',
);
break;
case 'mysql':
$connectionParams = array(
'user' => $user,
'password' => $pass,
'host' => $host,
'port' => $port,
'dbname' => $name,
'charset' => 'UTF8',
'driver' => 'pdo_mysql',
);
break;
case 'pgsql':
$connectionParams = array(
'user' => $user,
'password' => $pass,
'host' => $host,
'port' => $port,
'dbname' => $name,
'driver' => 'pdo_pgsql',
);
break;
case 'oci':
$connectionParams = array(
'user' => $user,
'password' => $pass,
'host' => $host,
'port' => $port,
'dbname' => $name,
'charset' => 'AL32UTF8',
'driver' => 'oci8',
);
break;
case 'mssql':
$connectionParams = array(
'user' => $user,
'password' => $pass,
'host' => $host,
'port' => $port,
'dbname' => $name,
'charset' => 'UTF8',
'driver' => 'pdo_sqlsrv',
);
break;
default:
return false;
}
try {
self::$DOCTRINE = \Doctrine\DBAL\DriverManager::getConnection($connectionParams, $config);
} catch(\Doctrine\DBAL\DBALException $e) {
OC_Log::write('core', $e->getMessage(), OC_Log::FATAL);
OC_User::setUserId(null);
// send http status 503
header('HTTP/1.1 503 Service Temporarily Unavailable');
header('Status: 503 Service Temporarily Unavailable');
OC_Template::printErrorPage('Failed to connect to database');
die();
}
}
return true;
}
/**
* @brief Prepare a SQL query
* @param string $query Query string
* @param int $limit
* @param int $offset
* @return \Doctrine\DBAL\Statement prepared SQL query
*
* SQL query via Doctrine prepare(), needs to be execute()'d!
*/
static public function prepare( $query , $limit=null, $offset=null ) {
if (!is_null($limit) && $limit != -1) {
//Doctrine does not handle limit and offset.
//FIXME: check limit notation for other dbs
//the following sql thus might needs to take into account db ways of representing it
//(oracle has no LIMIT / OFFSET)
$limit = (int)$limit;
$limitsql = ' LIMIT ' . $limit;
if (!is_null($offset)) {
$offset = (int)$offset;
$limitsql .= ' OFFSET ' . $offset;
}
//insert limitsql
if (substr($query, -1) == ';') { //if query ends with ;
$query = substr($query, 0, -1) . $limitsql . ';';
} else {
$query.=$limitsql;
}
} else {
if (isset(self::$preparedQueries[$query]) and self::$cachingEnabled) {
return self::$preparedQueries[$query];
}
}
$rawQuery = $query;
// Optimize the query
$query = self::processQuery( $query );
self::connect();
// return the result
if (self::$backend == self::BACKEND_DOCTRINE) {
try {
$result=self::$connection->prepare($query);
} catch(\Doctrine\DBAL\DBALException $e) {
throw new DatabaseException($e->getMessage(), $query);
}
$result=new DoctrineStatementWrapper($result);
}
if ((is_null($limit) || $limit == -1) and self::$cachingEnabled ) {
$type = OC_Config::getValue( "dbtype", "sqlite" );
if( $type != 'sqlite' && $type != 'sqlite3' ) {
self::$preparedQueries[$rawQuery] = $result;
}
}
return $result;
}
/**
* @brief gets last value of autoincrement
* @param string $table The optional table name (will replace *PREFIX*) and add sequence suffix
* @return int id
*
* \Doctrine\DBAL\Connection lastInsertId
*
* Call this method right after the insert command or other functions may
* cause trouble!
*/
public static function insertid($table=null) {
self::connect();
$type = OC_Config::getValue( "dbtype", "sqlite" );
if( $type == 'pgsql' ) {
$query = self::prepare('SELECT lastval() AS id');
$row = $query->execute()->fetchRow();
return $row['id'];
}
if( $type == 'mssql' ) {
if($table !== null) {
$prefix = OC_Config::getValue( "dbtableprefix", "oc_" );
$table = str_replace( '*PREFIX*', $prefix, $table );
}
return self::$connection->lastInsertId($table);
} else {
if($table !== null) {
$prefix = OC_Config::getValue( "dbtableprefix", "oc_" );
$suffix = OC_Config::getValue( "dbsequencesuffix", "_id_seq" );
$table = str_replace( '*PREFIX*', $prefix, $table ).$suffix;
}
return self::$connection->lastInsertId($table);
}
}
/**
* @brief Disconnect
* @return bool
*
* This is good bye, good bye, yeah!
*/
public static function disconnect() {
// Cut connection if required
if(self::$connection) {
self::$connection=false;
self::$DOCTRINE=false;
}
return true;
}
/** else {
* @brief saves database scheme to xml file
* @param string $file name of file
* @param int $mode
* @return bool
*
* TODO: write more documentation
*/
public static function getDbStructure( $file, $mode=MDB2_SCHEMA_DUMP_STRUCTURE) {
self::connectDoctrine();
return OC_DB_Schema::getDbStructure(self::$DOCTRINE, $file);
}
/**
* @brief Creates tables from XML file
* @param string $file file to read structure from
* @return bool
*
* TODO: write more documentation
*/
public static function createDbFromStructure( $file ) {
self::connectDoctrine();
return OC_DB_Schema::createDbFromStructure(self::$DOCTRINE, $file);
/* FIXME: use CURRENT_TIMESTAMP for all databases. mysql supports it as a default for DATETIME since 5.6.5 [1]
* as a fallback we could use <default>0000-01-01 00:00:00</default> everywhere
* [1] http://bugs.mysql.com/bug.php?id=27645
* http://dev.mysql.com/doc/refman/5.0/en/timestamp-initialization.html
* http://www.postgresql.org/docs/8.1/static/functions-datetime.html
* http://www.sqlite.org/lang_createtable.html
* http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions037.htm
*/
if( $CONFIG_DBTYPE == 'pgsql' ) { //mysql support it too but sqlite doesn't
$content = str_replace( '<default>0000-00-00 00:00:00</default>',
'<default>CURRENT_TIMESTAMP</default>', $content );
}
}
/**
* @brief update the database scheme
* @param string $file file to read structure from
* @return bool
*/
public static function updateDbFromStructure($file) {
self::connectDoctrine();
try {
$result = OC_DB_Schema::updateDbFromStructure(self::$DOCTRINE, $file);
} catch (Exception $e) {
OC_Log::write('core', 'Failed to update database structure ('.$e.')', OC_Log::FATAL);
throw $e;
}
return $result;
/* FIXME: use CURRENT_TIMESTAMP for all databases. mysql supports it as a default for DATETIME since 5.6.5 [1]
* as a fallback we could use <default>0000-01-01 00:00:00</default> everywhere
* [1] http://bugs.mysql.com/bug.php?id=27645
* http://dev.mysql.com/doc/refman/5.0/en/timestamp-initialization.html
* http://www.postgresql.org/docs/8.1/static/functions-datetime.html
* http://www.sqlite.org/lang_createtable.html
* http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions037.htm
*/
if( $CONFIG_DBTYPE == 'pgsql' ) { //mysql support it too but sqlite doesn't
$content = str_replace( '<default>0000-00-00 00:00:00</default>',
'<default>CURRENT_TIMESTAMP</default>', $content );
}
}
/**
* @brief Insert a row if a matching row doesn't exists.
* @param string $table. The table to insert into in the form '*PREFIX*tableName'
* @param array $input. An array of fieldname/value pairs
* @returns The return value from DoctrineStatementWrapper->execute()
*/
public static function insertIfNotExist($table, $input) {
self::connect();
$prefix = OC_Config::getValue( "dbtableprefix", "oc_" );
$table = str_replace( '*PREFIX*', $prefix, $table );
if(is_null(self::$type)) {
self::$type=OC_Config::getValue( "dbtype", "sqlite" );
}
$type = self::$type;
$query = '';
// differences in escaping of table names ('`' for mysql) and getting the current timestamp
if( $type == 'sqlite' || $type == 'sqlite3' ) {
// NOTE: For SQLite we have to use this clumsy approach
// otherwise all fieldnames used must have a unique key.
$query = 'SELECT * FROM "' . $table . '" WHERE ';
foreach($input as $key => $value) {
$query .= $key . " = '" . $value . '\' AND ';
}
$query = substr($query, 0, strlen($query) - 5);
try {
$stmt = self::prepare($query);
$result = $stmt->execute();
} catch(\Doctrine\DBAL\DBALException $e) {
$entry = 'DB Error: "'.$e->getMessage() . '"<br />';
$entry .= 'Offending command was: ' . $query . '<br />';
OC_Log::write('core', $entry, OC_Log::FATAL);
error_log('DB error: '.$entry);
OC_Template::printErrorPage( $entry );
}
if($result->numRows() == 0) {
$query = 'INSERT INTO "' . $table . '" ("'
. implode('","', array_keys($input)) . '") VALUES("'
. implode('","', array_values($input)) . '")';
} else {
return true;
}
} elseif( $type == 'pgsql' || $type == 'oci' || $type == 'mysql' || $type == 'mssql') {
$query = 'INSERT INTO `' .$table . '` ('
. implode(',', array_keys($input)) . ') SELECT \''
. implode('\',\'', array_values($input)) . '\' FROM ' . $table . ' WHERE ';
foreach($input as $key => $value) {
$query .= $key . " = '" . $value . '\' AND ';
}
$query = substr($query, 0, strlen($query) - 5);
$query .= ' HAVING COUNT(*) = 0';
}
// TODO: oci should be use " (quote) instead of ` (backtick).
//OC_Log::write('core', __METHOD__ . ', type: ' . $type . ', query: ' . $query, OC_Log::DEBUG);
try {
$result = self::prepare($query);
} catch(\Doctrine\DBAL\DBALException $e) {
$entry = 'DB Error: "'.$e->getMessage() . '"<br />';
$entry .= 'Offending command was: ' . $query.'<br />';
OC_Log::write('core', $entry, OC_Log::FATAL);
error_log('DB error: ' . $entry);
OC_Template::printErrorPage( $entry );
}
return $result->execute();
}
/**
* @brief does minor changes to query
* @param string $query Query string
* @return string corrected query string
*
* This function replaces *PREFIX* with the value of $CONFIG_DBTABLEPREFIX
* and replaces the ` with ' or " according to the database driver.
*/
private static function processQuery( $query ) {
self::connect();
// We need Database type and table prefix
if(is_null(self::$type)) {
self::$type=OC_Config::getValue( "dbtype", "sqlite" );
}
$type = self::$type;
if(is_null(self::$prefix)) {
self::$prefix=OC_Config::getValue( "dbtableprefix", "oc_" );
}
$prefix = self::$prefix;
// differences in escaping of table names ('`' for mysql) and getting the current timestamp
if( $type == 'sqlite' || $type == 'sqlite3' ) {
$query = str_replace( '`', '"', $query );
$query = str_ireplace( 'NOW()', 'datetime(\'now\')', $query );
$query = str_ireplace( 'UNIX_TIMESTAMP()', 'strftime(\'%s\',\'now\')', $query );
} elseif( $type == 'pgsql' ) {
$query = str_replace( '`', '"', $query );
$query = str_ireplace( 'UNIX_TIMESTAMP()', 'cast(extract(epoch from current_timestamp) as integer)',
$query );
} elseif( $type == 'oci' ) {
$query = str_replace( '`', '"', $query );
$query = str_ireplace( 'NOW()', 'CURRENT_TIMESTAMP', $query );
}elseif( $type == 'mssql' ) {
$query = preg_replace( "/\`(.*?)`/", "[$1]", $query );
$query = str_replace( 'NOW()', 'CURRENT_TIMESTAMP', $query );
$query = str_replace( 'now()', 'CURRENT_TIMESTAMP', $query );
$query = str_replace( 'LENGTH(', 'LEN(', $query );
$query = str_replace( 'SUBSTR(', 'SUBSTRING(', $query );
$query = self::fixLimitClauseForMSSQL($query);
}
// replace table name prefix
$query = str_replace( '*PREFIX*', $prefix, $query );
return $query;
}
private static function fixLimitClauseForMSSQL($query) {
$limitLocation = stripos ($query, "LIMIT");
if ( $limitLocation === false ) {
return $query;
}
// total == 0 means all results - not zero results
//
// First number is either total or offset, locate it by first space
//
$offset = substr ($query, $limitLocation + 5);
$offset = substr ($offset, 0, stripos ($offset, ' '));
$offset = trim ($offset);
// check for another parameter
if (stripos ($offset, ',') === false) {
// no more parameters
$offset = 0;
$total = intval ($offset);
} else {
// found another parameter
$offset = intval ($offset);
$total = substr ($query, $limitLocation + 5);
$total = substr ($total, stripos ($total, ','));
$total = substr ($total, 0, stripos ($total, ' '));
$total = intval ($total);
}
$query = trim (substr ($query, 0, $limitLocation));
if ($offset == 0 && $total !== 0) {
if (strpos($query, "SELECT") === false) {
$query = "TOP {$total} " . $query;
} else {
$query = preg_replace('/SELECT(\s*DISTINCT)?/Dsi', 'SELECT$1 TOP '.$total, $query);
}
} else if ($offset > 0) {
$query = preg_replace('/SELECT(\s*DISTINCT)?/Dsi', 'SELECT$1 TOP(10000000) ', $query);
$query = 'SELECT *
FROM (SELECT sub2.*, ROW_NUMBER() OVER(ORDER BY sub2.line2) AS line3
FROM (SELECT 1 AS line2, sub1.* FROM (' . $query . ') AS sub1) as sub2) AS sub3';
if ($total > 0) {
$query .= ' WHERE line3 BETWEEN ' . ($offset + 1) . ' AND ' . ($offset + $total);
} else {
$query .= ' WHERE line3 > ' . $offset;
}
}
return $query;
}
/**
* @brief drop a table
* @param string $tableName the table to drop
*/
public static function dropTable($tableName) {
self::connectDoctrine();
OC_DB_Schema::dropTable(self::$DOCTRINE, $tableName);
}
/**
* remove all tables defined in a database structure xml file
* @param string $file the xml file describing the tables
*/
public static function removeDBStructure($file) {
self::connectDoctrine();
OC_DB_Schema::removeDBStructure(self::$DOCTRINE, $file);
}
/**
* @brief replaces the owncloud tables with a new set
* @param $file string path to the MDB2 xml db export file
*/
public static function replaceDB( $file ) {
self::connectDoctrine();
OC_DB_Schema::replaceDB(self::$DOCTRINE, $file);
}
/**
* Start a transaction
* @return bool
*/
public static function beginTransaction() {
self::connect();
self::$connection->beginTransaction();
self::$inTransaction=true;
return true;
}
/**
* Commit the database changes done during a transaction that is in progress
* @return bool
*/
public static function commit() {
self::connect();
if(!self::$inTransaction) {
return false;
}
self::$connection->commit();
self::$inTransaction=false;
return true;
}
/**
* check if a result is an error, works with Doctrine
* @param mixed $result
* @return bool
*/
public static function isError($result) {
if(!$result) {
return true;
} else {
return false;
}
}
/**
* returns the error code and message as a string for logging
* works with DoctrineException
* @param mixed $error
* @return string
*/
public static function getErrorMessage($error) {
if (self::$backend==self::BACKEND_DOCTRINE and self::$DOCTRINE) {
$msg = self::$DOCTRINE->errorCode() . ': ';
$errorInfo = self::$DOCTRINE->errorInfo();
if (is_array($errorInfo)) {
$msg .= 'SQLSTATE = '.$errorInfo[0] . ', ';
$msg .= 'Driver Code = '.$errorInfo[1] . ', ';
$msg .= 'Driver Message = '.$errorInfo[2];
} else {
$msg = '';
}
} else {
$msg = '';
}
return $msg;
}
/**
* @param bool $enabled
*/
static public function enableCaching($enabled) {
if (!$enabled) {
self::$preparedQueries = array();
}
self::$cachingEnabled = $enabled;
}
}
/**
* small wrapper around \Doctrine\DBAL\Driver\Statement to make it behave, more like an MDB2 Statement
*/
class DoctrineStatementWrapper {
/**
* @var \Doctrine\DBAL\Driver\Statement
*/
private $statement=null;
private $lastArguments=array();
public function __construct($statement) {
$this->statement=$statement;
}
/**
* pass all other function directly to the \Doctrine\DBAL\Driver\Statement
*/
public function __call($name,$arguments) {
return call_user_func_array(array($this->statement,$name), $arguments);
}
/**
* provide numRows
*/
public function numRows() {
$regex = '/^SELECT\s+(?:ALL\s+|DISTINCT\s+)?(?:.*?)\s+FROM\s+(.*)$/i';
$queryString = $this->statement->getWrappedStatement()->queryString;
if (preg_match($regex, $queryString, $output) > 0) {
$query = OC_DB::prepare("SELECT COUNT(*) FROM {$output[1]}", PDO::FETCH_NUM);
return $query->execute($this->lastArguments)->fetchColumn();
}else{
return $this->statement->rowCount();
}
}
/**
* make execute return the result instead of a bool
*/
public function execute($input=array()) {
$this->lastArguments = $input;
if (count($input) > 0) {
if (!isset($type)) {
$type = OC_Config::getValue( "dbtype", "sqlite" );
}
if ($type == 'mssql') {
$input = $this->tryFixSubstringLastArgumentDataForMSSQL($input);
}
$result=$this->statement->execute($input);
} else {
$result=$this->statement->execute();
}
if ($result) {
return $this;
} else {
return false;
}
}
private function tryFixSubstringLastArgumentDataForMSSQL($input) {
$query = $this->statement->queryString;
$pos = stripos ($query, 'SUBSTRING');
if ( $pos === false) {
return;
}
try {
$newQuery = '';
$cArg = 0;
$inSubstring = false;
// Create new query
for ($i = 0; $i < strlen ($query); $i++) {
if ($inSubstring == false) {
// Defines when we should start inserting values
if (substr ($query, $i, 9) == 'SUBSTRING') {
$inSubstring = true;
}
} else {
// Defines when we should stop inserting values
if (substr ($query, $i, 1) == ')') {
$inSubstring = false;
}
}
if (substr ($query, $i, 1) == '?') {
// We found a question mark
if ($inSubstring) {
$newQuery .= $input[$cArg];
//
// Remove from input array
//
array_splice ($input, $cArg, 1);
} else {
$newQuery .= substr ($query, $i, 1);
$cArg++;
}
} else {
$newQuery .= substr ($query, $i, 1);
}
}
// The global data we need
$name = OC_Config::getValue( "dbname", "owncloud" );
$host = OC_Config::getValue( "dbhost", "" );
$user = OC_Config::getValue( "dbuser", "" );
$pass = OC_Config::getValue( "dbpassword", "" );
if (strpos($host,':')) {
list($host, $port) = explode(':', $host, 2);
} else {
$port = false;
}
$opts = array();
if ($port) {
$dsn = 'sqlsrv:Server='.$host.','.$port.';Database='.$name;
} else {
$dsn = 'sqlsrv:Server='.$host.';Database='.$name;
}
$PDO = new PDO($dsn, $user, $pass, $opts);
$PDO->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
$PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$this->statement = $PDO->prepare($newQuery);
$this->lastArguments = $input;
return $input;
} catch (PDOException $e){
$entry = 'PDO DB Error: "'.$e->getMessage().'"<br />';
$entry .= 'Offending command was: '.$this->statement->queryString .'<br />';
$entry .= 'Input parameters: ' .print_r($input, true).'<br />';
$entry .= 'Stack trace: ' .$e->getTraceAsString().'<br />';
OC_Log::write('core', $entry, OC_Log::FATAL);
OC_User::setUserId(null);
// send http status 503
header('HTTP/1.1 503 Service Temporarily Unavailable');
header('Status: 503 Service Temporarily Unavailable');
OC_Template::printErrorPage('Failed to connect to database');
die ($entry);
}
}
/**
* provide an alias for fetch
*/
public function fetchRow() {
return $this->statement->fetch();
}
/**
* Provide a simple fetchOne.
* fetch single column from the next row
* @param int $colnum the column number to fetch
*/
public function fetchOne($colnum = 0) {
return $this->statement->fetchColumn($colnum);
}
}