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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\db\driver;
/**
* Oracle Database Abstraction Layer
*/
class oracle extends \phpbb\db\driver\driver
{
    var $last_query_text = '';
    var $connect_error = '';
    /**
    * {@inheritDoc}
    */
    function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
    {
        $this->persistency = $persistency;
        $this->user = $sqluser;
        $this->server = $sqlserver . (($port) ? ':' . $port : '');
        $this->dbname = $database;
        $connect = $database;
        // support for "easy connect naming"
        if ($sqlserver !== '' && $sqlserver !== '/')
        {
            if (substr($sqlserver, -1, 1) == '/')
            {
                $sqlserver == substr($sqlserver, 0, -1);
            }
            $connect = $sqlserver . (($port) ? ':' . $port : '') . '/' . $database;
        }
        if ($new_link)
        {
            if (!function_exists('oci_new_connect'))
            {
                $this->connect_error = 'oci_new_connect function does not exist, is oci extension installed?';
                return $this->sql_error('');
            }
            $this->db_connect_id = @oci_new_connect($this->user, $sqlpassword, $connect, 'UTF8');
        }
        else if ($this->persistency)
        {
            if (!function_exists('oci_pconnect'))
            {
                $this->connect_error = 'oci_pconnect function does not exist, is oci extension installed?';
                return $this->sql_error('');
            }
            $this->db_connect_id = @oci_pconnect($this->user, $sqlpassword, $connect, 'UTF8');
        }
        else
        {
            if (!function_exists('oci_connect'))
            {
                $this->connect_error = 'oci_connect function does not exist, is oci extension installed?';
                return $this->sql_error('');
            }
            $this->db_connect_id = @oci_connect($this->user, $sqlpassword, $connect, 'UTF8');
        }
        return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
    }
    /**
    * {@inheritDoc}
    */
    function sql_server_info($raw = false, $use_cache = true)
    {
        /**
        * force $use_cache false.  I didn't research why the caching code below is commented out
        * but I assume its because the Oracle extension provides a direct method to access it
        * without a query.
        */
/*
        global $cache;
        if (empty($cache) || ($this->sql_server_version = $cache->get('oracle_version')) === false)
        {
            $result = @ociparse($this->db_connect_id, 'SELECT * FROM v$version WHERE banner LIKE \'Oracle%\'');
            @ociexecute($result, OCI_DEFAULT);
            @ocicommit($this->db_connect_id);
            $row = array();
            @ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS);
            @ocifreestatement($result);
            $this->sql_server_version = trim($row['BANNER']);
            $cache->put('oracle_version', $this->sql_server_version);
        }
*/
        $this->sql_server_version = @oci_server_version($this->db_connect_id);
        return $this->sql_server_version;
    }
    /**
    * SQL Transaction
    * @access private
    */
    function _sql_transaction($status = 'begin')
    {
        switch ($status)
        {
            case 'begin':
                return true;
            break;
            case 'commit':
                return @oci_commit($this->db_connect_id);
            break;
            case 'rollback':
                return @oci_rollback($this->db_connect_id);
            break;
        }
        return true;
    }
    /**
    * Oracle specific code to handle the fact that it does not compare columns properly
    * @access private
    */
    function _rewrite_col_compare($args)
    {
        if (count($args) == 4)
        {
            if ($args[2] == '=')
            {
                return '(' . $args[0] . ' OR (' . $args[1] . ' is NULL AND ' . $args[3] . ' is NULL))';
            }
            else if ($args[2] == '<>')
            {
                // really just a fancy way of saying foo <> bar or (foo is NULL XOR bar is NULL) but SQL has no XOR :P
                return '(' . $args[0] . ' OR ((' . $args[1] . ' is NULL AND ' . $args[3] . ' is NOT NULL) OR (' . $args[1] . ' is NOT NULL AND ' . $args[3] . ' is NULL)))';
            }
        }
        else
        {
            return $this->_rewrite_where($args[0]);
        }
    }
    /**
    * Oracle specific code to handle it's lack of sanity
    * @access private
    */
    function _rewrite_where($where_clause)
    {
        preg_match_all('/\s*(AND|OR)?\s*([\w_.()]++)\s*(?:(=|<[=>]?|>=?|LIKE)\s*((?>\'(?>[^\']++|\'\')*+\'|[\d-.()]+))|((NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))/', $where_clause, $result, PREG_SET_ORDER);
        $out = '';
        foreach ($result as $val)
        {
            if (!isset($val[5]))
            {
                if ($val[4] !== "''")
                {
                    $out .= $val[0];
                }
                else
                {
                    $out .= ' ' . $val[1] . ' ' . $val[2];
                    if ($val[3] == '=')
                    {
                        $out .= ' is NULL';
                    }
                    else if ($val[3] == '<>')
                    {
                        $out .= ' is NOT NULL';
                    }
                }
            }
            else
            {
                $in_clause = array();
                $sub_exp = substr($val[5], strpos($val[5], '(') + 1, -1);
                $extra = false;
                preg_match_all('/\'(?>[^\']++|\'\')*+\'|[\d-.]++/', $sub_exp, $sub_vals, PREG_PATTERN_ORDER);
                $i = 0;
                foreach ($sub_vals[0] as $sub_val)
                {
                    // two things:
                    // 1) This determines if an empty string was in the IN clausing, making us turn it into a NULL comparison
                    // 2) This fixes the 1000 list limit that Oracle has (ORA-01795)
                    if ($sub_val !== "''")
                    {
                        $in_clause[(int) $i++/1000][] = $sub_val;
                    }
                    else
                    {
                        $extra = true;
                    }
                }
                if (!$extra && $i < 1000)
                {
                    $out .= $val[0];
                }
                else
                {
                    $out .= ' ' . $val[1] . '(';
                    $in_array = array();
                    // constuct each IN() clause
                    foreach ($in_clause as $in_values)
                    {
                        $in_array[] = $val[2] . ' ' . (isset($val[6]) ? $val[6] : '') . 'IN(' . implode(', ', $in_values) . ')';
                    }
                    // Join the IN() clauses against a few ORs (IN is just a nicer OR anyway)
                    $out .= implode(' OR ', $in_array);
                    // handle the empty string case
                    if ($extra)
                    {
                        $out .= ' OR ' . $val[2] . ' is ' . (isset($val[6]) ? $val[6] : '') . 'NULL';
                    }
                    $out .= ')';
                    unset($in_array, $in_clause);
                }
            }
        }
        return $out;
    }
    /**
    * {@inheritDoc}
    */
    function sql_query($query = '', $cache_ttl = 0)
    {
        if ($query != '')
        {
            global $cache;
            if ($this->debug_sql_explain)
            {
                $this->sql_report('start', $query);
            }
            else if ($this->debug_load_time)
            {
                $this->curtime = microtime(true);
            }
            $this->last_query_text = $query;
            $this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
            $this->sql_add_num_queries($this->query_result);
            if ($this->query_result === false)
            {
                $in_transaction = false;
                if (!$this->transaction)
                {
                    $this->sql_transaction('begin');
                }
                else
                {
                    $in_transaction = true;
                }
                $array = array();
                // We overcome Oracle's 4000 char limit by binding vars
                if (strlen($query) > 4000)
                {
                    if (preg_match('/^(INSERT INTO[^(]++)\\(([^()]+)\\) VALUES[^(]++\\((.*?)\\)$/sU', $query, $regs))
                    {
                        if (strlen($regs[3]) > 4000)
                        {
                            $cols = explode(', ', $regs[2]);
                            preg_match_all('/\'(?:[^\']++|\'\')*+\'|[\d-.]+/', $regs[3], $vals, PREG_PATTERN_ORDER);
/*                        The code inside this comment block breaks clob handling, but does allow the
                        database restore script to work.  If you want to allow no posts longer than 4KB
                        and/or need the db restore script, uncomment this.
                            if (count($cols) !== count($vals))
                            {
                                // Try to replace some common data we know is from our restore script or from other sources
                                $regs[3] = str_replace("'||chr(47)||'", '/', $regs[3]);
                                $_vals = explode(', ', $regs[3]);
                                $vals = array();
                                $is_in_val = false;
                                $i = 0;
                                $string = '';
                                foreach ($_vals as $value)
                                {
                                    if (strpos($value, "'") === false && !$is_in_val)
                                    {
                                        $vals[$i++] = $value;
                                        continue;
                                    }
                                    if (substr($value, -1) === "'")
                                    {
                                        $vals[$i] = $string . (($is_in_val) ? ', ' : '') . $value;
                                        $string = '';
                                        $is_in_val = false;
                                        if ($vals[$i][0] !== "'")
                                        {
                                            $vals[$i] = "''" . $vals[$i];
                                        }
                                        $i++;
                                        continue;
                                    }
                                    else
                                    {
                                        $string .= (($is_in_val) ? ', ' : '') . $value;
                                        $is_in_val = true;
                                    }
                                }
                                if ($string)
                                {
                                    // New value if cols != value
                                    $vals[(count($cols) !== count($vals)) ? $i : $i - 1] .= $string;
                                }
                                $vals = array(0 => $vals);
                            }
*/
                            $inserts = $vals[0];
                            unset($vals);
                            foreach ($inserts as $key => $value)
                            {
                                if (!empty($value) && $value[0] === "'" && strlen($value) > 4002) // check to see if this thing is greater than the max + 'x2
                                {
                                    $inserts[$key] = ':' . strtoupper($cols[$key]);
                                    $array[$inserts[$key]] = str_replace("''", "'", substr($value, 1, -1));
                                }
                            }
                            $query = $regs[1] . '(' . $regs[2] . ') VALUES (' . implode(', ', $inserts) . ')';
                        }
                    }
                    else if (preg_match_all('/^(UPDATE [\\w_]++\\s+SET )([\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+)(?:,\\s*[\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+)\\s+(WHERE.*)$/s', $query, $data, PREG_SET_ORDER))
                    {
                        if (strlen($data[0][2]) > 4000)
                        {
                            $update = $data[0][1];
                            $where = $data[0][3];
                            preg_match_all('/([\\w_]++)\\s*=\\s*(\'(?:[^\']++|\'\')*+\'|[\d-.]++)/', $data[0][2], $temp, PREG_SET_ORDER);
                            unset($data);
                            $cols = array();
                            foreach ($temp as $value)
                            {
                                if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 4002) // check to see if this thing is greater than the max + 'x2
                                {
                                    $cols[] = $value[1] . '=:' . strtoupper($value[1]);
                                    $array[$value[1]] = str_replace("''", "'", substr($value[2], 1, -1));
                                }
                                else
                                {
                                    $cols[] = $value[1] . '=' . $value[2];
                                }
                            }
                            $query = $update . implode(', ', $cols) . ' ' . $where;
                            unset($cols);
                        }
                    }
                }
                switch (substr($query, 0, 6))
                {
                    case 'DELETE':
                        if (preg_match('/^(DELETE FROM [\w_]++ WHERE)((?:\s*(?:AND|OR)?\s*[\w_]+\s*(?:(?:=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]+)|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))*+)$/', $query, $regs))
                        {
                            $query = $regs[1] . $this->_rewrite_where($regs[2]);
                            unset($regs);
                        }
                    break;
                    case 'UPDATE':
                        if (preg_match('/^(UPDATE [\\w_]++\\s+SET [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++)(?:, [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++))*+\\s+WHERE)(.*)$/s',  $query, $regs))
                        {
                            $query = $regs[1] . $this->_rewrite_where($regs[2]);
                            unset($regs);
                        }
                    break;
                    case 'SELECT':
                        $query = preg_replace_callback('/([\w_.]++)\s*(?:(=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]++|([\w_.]++))|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]++,? ?)*+\))/', array($this, '_rewrite_col_compare'), $query);
                    break;
                }
                $this->query_result = @oci_parse($this->db_connect_id, $query);
                foreach ($array as $key => $value)
                {
                    @oci_bind_by_name($this->query_result, $key, $array[$key], -1);
                }
                $success = @oci_execute($this->query_result, OCI_DEFAULT);
                if (!$success)
                {
                    $this->sql_error($query);
                    $this->query_result = false;
                }
                else
                {
                    if (!$in_transaction)
                    {
                        $this->sql_transaction('commit');
                    }
                }
                if ($this->debug_sql_explain)
                {
                    $this->sql_report('stop', $query);
                }
                else if ($this->debug_load_time)
                {
                    $this->sql_time += microtime(true) - $this->curtime;
                }
                if (!$this->query_result)
                {
                    return false;
                }
                $safe_query_id = $this->clean_query_id($this->query_result);
                if ($cache && $cache_ttl)
                {
                    $this->open_queries[$safe_query_id] = $this->query_result;
                    $this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
                }
                else if (strpos($query, 'SELECT') === 0)
                {
                    $this->open_queries[$safe_query_id] = $this->query_result;
                }
            }
            else if ($this->debug_sql_explain)
            {
                $this->sql_report('fromcache', $query);
            }
        }
        else
        {
            return false;
        }
        return $this->query_result;
    }
    /**
    * Build LIMIT query
    */
    function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
    {
        $this->query_result = false;
        $query = 'SELECT * FROM (SELECT /*+ FIRST_ROWS */ rownum AS xrownum, a.* FROM (' . $query . ') a WHERE rownum <= ' . ($offset + $total) . ') WHERE xrownum >= ' . $offset;
        return $this->sql_query($query, $cache_ttl);
    }
    /**
    * {@inheritDoc}
    */
    function sql_affectedrows()
    {
        return ($this->query_result) ? @oci_num_rows($this->query_result) : false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_fetchrow($query_id = false)
    {
        global $cache;
        if ($query_id === false)
        {
            $query_id = $this->query_result;
        }
        $safe_query_id = $this->clean_query_id($query_id);
        if ($cache && $cache->sql_exists($safe_query_id))
        {
            return $cache->sql_fetchrow($safe_query_id);
        }
        if ($query_id)
        {
            if (!$row = oci_fetch_array($query_id, OCI_ASSOC + OCI_RETURN_NULLS))
            {
                return false;
            }
            $result_row = array();
            foreach ($row as $key => $value)
            {
                // Oracle treats empty strings as null
                if (is_null($value))
                {
                    $value = '';
                }
                // OCI->CLOB?
                if (is_object($value))
                {
                    $value = $value->load();
                }
                $result_row[strtolower($key)] = $value;
            }
            return $result_row;
        }
        return false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_rowseek($rownum, &$query_id)
    {
        global $cache;
        if ($query_id === false)
        {
            $query_id = $this->query_result;
        }
        $safe_query_id = $this->clean_query_id($query_id);
        if ($cache && $cache->sql_exists($safe_query_id))
        {
            return $cache->sql_rowseek($rownum, $safe_query_id);
        }
        if (!$query_id)
        {
            return false;
        }
        // Reset internal pointer
        @oci_execute($query_id, OCI_DEFAULT);
        // We do not fetch the row for rownum == 0 because then the next resultset would be the second row
        for ($i = 0; $i < $rownum; $i++)
        {
            if (!$this->sql_fetchrow($query_id))
            {
                return false;
            }
        }
        return true;
    }
    /**
     * {@inheritdoc}
     */
    public function sql_last_inserted_id()
    {
        $query_id = $this->query_result;
        if ($query_id !== false && $this->last_query_text != '')
        {
            if (preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#is', $this->last_query_text, $tablename))
            {
                $query = 'SELECT ' . $tablename[1] . '_seq.currval FROM DUAL';
                $stmt = @oci_parse($this->db_connect_id, $query);
                if ($stmt)
                {
                    $success = @oci_execute($stmt, OCI_DEFAULT);
                    if ($success)
                    {
                        $temp_array = oci_fetch_array($stmt, OCI_ASSOC + OCI_RETURN_NULLS);
                        oci_free_statement($stmt);
                        if (!empty($temp_array))
                        {
                            return $temp_array['CURRVAL'];
                        }
                        else
                        {
                            return false;
                        }
                    }
                }
            }
        }
        return false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_freeresult($query_id = false)
    {
        global $cache;
        if ($query_id === false)
        {
            $query_id = $this->query_result;
        }
        $safe_query_id = $this->clean_query_id($query_id);
        if ($cache && $cache->sql_exists($safe_query_id))
        {
            return $cache->sql_freeresult($safe_query_id);
        }
        if (isset($this->open_queries[$safe_query_id]))
        {
            unset($this->open_queries[$safe_query_id]);
            return oci_free_statement($query_id);
        }
        return false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_escape($msg)
    {
        return str_replace(array("'", "\0"), array("''", ''), $msg);
    }
    /**
    * Build LIKE expression
    * @access private
    */
    function _sql_like_expression($expression)
    {
        return $expression . " ESCAPE '\\'";
    }
    /**
    * Build NOT LIKE expression
    * @access private
    */
    function _sql_not_like_expression($expression)
    {
        return $expression . " ESCAPE '\\'";
    }
    function _sql_custom_build($stage, $data)
    {
        return $data;
    }
    function _sql_bit_and($column_name, $bit, $compare = '')
    {
        return 'BITAND(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : '');
    }
    function _sql_bit_or($column_name, $bit, $compare = '')
    {
        return 'BITOR(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : '');
    }
    /**
    * return sql error array
    * @access private
    */
    function _sql_error()
    {
        if (function_exists('oci_error'))
        {
            $error = @oci_error();
            $error = (!$error) ? @oci_error($this->query_result) : $error;
            $error = (!$error) ? @oci_error($this->db_connect_id) : $error;
            if ($error)
            {
                $this->last_error_result = $error;
            }
            else
            {
                $error = (isset($this->last_error_result) && $this->last_error_result) ? $this->last_error_result : array();
            }
        }
        else
        {
            $error = array(
                'message'    => $this->connect_error,
                'code'        => '',
            );
        }
        return $error;
    }
    /**
    * Close sql connection
    * @access private
    */
    function _sql_close()
    {
        return @oci_close($this->db_connect_id);
    }
    /**
    * Build db-specific report
    * @access private
    */
    function _sql_report($mode, $query = '')
    {
        switch ($mode)
        {
            case 'start':
                $html_table = false;
                // Grab a plan table, any will do
                $sql = "SELECT table_name
                    FROM USER_TABLES
                    WHERE table_name LIKE '%PLAN_TABLE%'";
                $stmt = oci_parse($this->db_connect_id, $sql);
                oci_execute($stmt);
                if ($result = oci_fetch_array($stmt, OCI_ASSOC + OCI_RETURN_NULLS))
                {
                    $table = $result['TABLE_NAME'];
                    // This is the statement_id that will allow us to track the plan
                    $statement_id = substr(md5($query), 0, 30);
                    // Remove any stale plans
                    $stmt2 = oci_parse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
                    oci_execute($stmt2);
                    oci_free_statement($stmt2);
                    // Explain the plan
                    $sql = "EXPLAIN PLAN
                        SET STATEMENT_ID = '$statement_id'
                        FOR $query";
                    $stmt2 = oci_parse($this->db_connect_id, $sql);
                    oci_execute($stmt2);
                    oci_free_statement($stmt2);
                    // Get the data from the plan
                    $sql = "SELECT operation, options, object_name, object_type, cardinality, cost
                        FROM plan_table
                        START WITH id = 0 AND statement_id = '$statement_id'
                        CONNECT BY PRIOR id = parent_id
                            AND statement_id = '$statement_id'";
                    $stmt2 = oci_parse($this->db_connect_id, $sql);
                    oci_execute($stmt2);
                    while ($row = oci_fetch_array($stmt2, OCI_ASSOC + OCI_RETURN_NULLS))
                    {
                        $html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
                    }
                    oci_free_statement($stmt2);
                    // Remove the plan we just made, we delete them on request anyway
                    $stmt2 = oci_parse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
                    oci_execute($stmt2);
                    oci_free_statement($stmt2);
                }
                oci_free_statement($stmt);
                if ($html_table)
                {
                    $this->html_hold .= '</table>';
                }
            break;
            case 'fromcache':
                $endtime = explode(' ', microtime());
                $endtime = $endtime[0] + $endtime[1];
                $result = @oci_parse($this->db_connect_id, $query);
                if ($result)
                {
                    $success = @oci_execute($result, OCI_DEFAULT);
                    if ($success)
                    {
                        array();
                        while ($row = oci_fetch_array($result, OCI_ASSOC + OCI_RETURN_NULLS))
                        {
                            // Take the time spent on parsing rows into account
                        }
                        @oci_free_statement($result);
                    }
                }
                $splittime = explode(' ', microtime());
                $splittime = $splittime[0] + $splittime[1];
                $this->sql_report('record_fromcache', $query, $endtime, $splittime);
            break;
        }
    }
    /**
    * {@inheritDoc}
    */
    function sql_quote($msg)
    {
        return '"' . $msg . '"';
    }
}