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<?php
/* base class with rudimentary SQL generation abilities.
* WARNING: argument is escaped, but $column and $operator are passed unfiltered into SQL */
class Filter
{
/**
* Delimiter for js_selectize filters
*/
const DELIMITER = '~,~';
public $column;
public $operator;
public $argument;
public function __construct($column, $operator, $argument = null)
{
$this->column = trim($column);
$this->operator = trim($operator);
$this->argument = trim($argument);
}
/* returns a where clause and adds needed operators to the passed array */
public function whereClause(&$args, &$joins)
{
global $unique_key;
$key = $this->column . '_arg' . ($unique_key++);
$addendum = '';
/* check if we have to do some parsing*/
if (Page_Statistics::$columns[$this->column]['type'] == 'date') {
$args[$key] = strtotime($this->argument);
} else {
$args[$key] = $this->argument;
if ($this->operator === '~' || $this->operator === '!~') {
$args[$key] = str_replace(array('=', '_', '%', '*', '?'), array('==', '=_', '=%', '%', '_'), $args[$key]);
$addendum = " ESCAPE '='";
}
}
$op = $this->operator;
if ($this->operator == '~') {
$op = 'LIKE';
} elseif ($this->operator == '!~') {
$op = 'NOT LIKE';
}
return $this->column . ' ' . $op . ' :' . $key . $addendum;
}
/* parse a query into an array of filters */
public static function parseQuery($query)
{
$operators = ['<=', '>=', '!=', '!~', '=', '~', '<', '>'];
$filters = [];
if (empty($query))
return $filters;
foreach (explode(self::DELIMITER, $query) as $q) {
$q = trim($q);
if (empty($q))
continue;
// Special case: User pasted UUID, turn into filter
if (preg_match('/^\w{8}-\w{4}-\w{4}-\w{4}-\w{12}$/', $q)) {
$filters[] = new Filter('machineuuid', '=', $q);
continue;
}
// Special case: User pasted IP, turn into filter
if (preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $q)) {
$filters[] = new Filter('clientip', '=', $q);
continue;
}
/* find position of first operator */
$pos = 10000;
$operator = false;
foreach ($operators as $op) {
$newpos = strpos($q, $op);
if ($newpos > -1 && ($newpos < $pos)) {
$pos = $newpos;
$operator = $op;
}
}
if ($pos == 10000) {
error_log("couldn't find operator in segment " . $q);
/* TODO */
continue;
}
$lhs = trim(substr($q, 0, $pos));
$rhs = trim(substr($q, $pos + strlen($operator)));
if ($lhs == 'gbram') {
$filters[] = new RamGbFilter($operator, $rhs);
} elseif ($lhs == 'state') {
error_log('new state filter with ' . $rhs);
$filters[] = new StateFilter($operator, $rhs);
} elseif ($lhs == 'hddgb') {
$filters[] = new Id44Filter($operator, $rhs);
} elseif ($lhs == 'location') {
$filters[] = new LocationFilter($operator, $rhs);
} elseif ($lhs == 'subnet') {
$filters[] = new SubnetFilter($operator, $rhs);
} else {
if (array_key_exists($lhs, Page_Statistics::$columns) && Page_Statistics::$columns[$lhs]['column']) {
$filters[] = new Filter($lhs, $operator, $rhs);
} else {
Message::addError('invalid-filter-key', $lhs);
}
}
}
return $filters;
}
}
class RamGbFilter extends Filter
{
public function __construct($operator, $argument)
{
parent::__construct('mbram', $operator, $argument);
}
public function whereClause(&$args, &$joins)
{
global $SIZE_RAM;
$lower = floor(Page_Statistics::findBestValue($SIZE_RAM, (int)$this->argument, false) * 1024 - 100);
$upper = ceil(Page_Statistics::findBestValue($SIZE_RAM, (int)$this->argument, true) * 1024 + 100);
if ($this->operator == '=') {
return " mbram BETWEEN $lower AND $upper";
} elseif ($this->operator == '<') {
return " mbram < $lower";
} elseif ($this->operator == '<=') {
return " mbram <= $upper";
} elseif ($this->operator == '>') {
return " mbram > $upper";
} elseif ($this->operator == '>=') {
return " mbram >= $lower";
} elseif ($this->operator == '!=') {
return " (mbram < $lower OR mbram > $upper)";
} else {
error_log("unimplemented operator in RamGbFilter: $this->operator");
return ' 1';
}
}
}
class Id44Filter extends Filter
{
public function __construct($operator, $argument)
{
parent::__construct('id44mb', $operator, $argument);
}
public function whereClause(&$args, &$joins)
{
global $SIZE_ID44;
$lower = floor(Page_Statistics::findBestValue($SIZE_ID44, $this->argument, false) * 1024 - 100);
$upper = ceil(Page_Statistics::findBestValue($SIZE_ID44, $this->argument, true) * 1024 + 100);
if ($this->operator == '=') {
return " id44mb BETWEEN $lower AND $upper";
} elseif ($this->operator == '!=') {
return " id44mb < $lower OR id44mb > $upper";
} elseif ($this->operator == '<=') {
return " id44mb < $upper";
} elseif ($this->operator == '>=') {
return " id44mb > $lower";
} elseif ($this->operator == '<') {
return " id44mb < $lower";
} elseif ($this->operator == '>') {
return " id44mb > $upper";
} else {
error_log("unimplemented operator in Id44Filter: $this->operator");
return ' 1';
}
}
}
class StateFilter extends Filter
{
public function __construct($operator, $argument)
{
$this->operator = $operator;
$this->argument = $argument;
}
public function whereClause(&$args, &$joins)
{
$neg = $this->operator == '!=' ? 'NOT ' : '';
if ($this->argument === 'on') {
return " $neg (lastseen + 600 > UNIX_TIMESTAMP() ) ";
} elseif ($this->argument === 'off') {
return " $neg (lastseen + 600 < UNIX_TIMESTAMP() ) ";
} elseif ($this->argument === 'idle') {
return " $neg (lastseen + 600 > UNIX_TIMESTAMP() AND logintime = 0 ) ";
} elseif ($this->argument === 'occupied') {
return " $neg (lastseen + 600 > UNIX_TIMESTAMP() AND logintime <> 0 ) ";
} else {
Message::addError('invalid-filter-argument', 'state', $this->argument);
return ' 1';
}
}
}
class LocationFilter extends Filter
{
public function __construct($operator, $argument)
{
parent::__construct('locationid', $operator, $argument);
}
public function whereClause(&$args, &$joins)
{
settype($this->argument, 'int');
if ($this->argument === 0) {
$neg = $this->operator === '=' ? '' : 'NOT';
return "machine.locationid IS $neg NULL";
} else {
$args['lid'] = $this->argument;
return "machine.locationid {$this->operator} :lid";
}
}
}
class SubnetFilter extends Filter
{
public function __construct($operator, $argument)
{
parent::__construct(null, $operator, $argument);
}
public function whereClause(&$args, &$joins)
{
$argument = preg_replace('/[^0-9\.:]/', '', $this->argument);
return " clientip LIKE '$argument%'";
}
}
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