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// expression_where.cpp
/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mongo/pch.h"
#include "mongo/base/init.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/client.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_parser.h"
#include "mongo/scripting/engine.h"
namespace mongo {
class WhereMatchExpression : public MatchExpression {
public:
WhereMatchExpression() : MatchExpression( WHERE ){ _func = 0; }
virtual ~WhereMatchExpression(){}
Status init( const StringData& ns, const StringData& theCode, const BSONObj& scope );
virtual bool matches( const MatchableDocument* doc, MatchDetails* details = 0 ) const;
virtual bool matchesSingleElement( const BSONElement& e ) const {
return false;
}
virtual MatchExpression* shallowClone() const {
WhereMatchExpression* e = new WhereMatchExpression();
e->init(_ns, _code, _userScope);
return e;
}
virtual void debugString( StringBuilder& debug, int level = 0 ) const;
virtual bool equivalent( const MatchExpression* other ) const ;
private:
string _ns;
string _code;
BSONObj _userScope;
auto_ptr<Scope> _scope;
ScriptingFunction _func;
};
Status WhereMatchExpression::init( const StringData& ns,
const StringData& theCode,
const BSONObj& scope ) {
if ( ns.size() == 0 )
return Status( ErrorCodes::BadValue, "ns for $where cannot be empty" );
if ( theCode.size() == 0 )
return Status( ErrorCodes::BadValue, "code for $where cannot be empty" );
_ns = ns.toString();
_code = theCode.toString();
_userScope = scope.getOwned();
NamespaceString nswrapper( _ns );
const string userToken = ClientBasic::getCurrent()->getAuthorizationSession()
->getAuthenticatedUserNamesToken();
_scope = globalScriptEngine->getPooledScope( nswrapper.db().toString(),
"where" + userToken );
_func = _scope->createFunction( _code.c_str() );
if ( !_func )
return Status( ErrorCodes::BadValue, "$where compile error" );
return Status::OK();
}
bool WhereMatchExpression::matches( const MatchableDocument* doc, MatchDetails* details ) const {
verify( _func );
BSONObj obj = doc->toBSON();
if ( ! _userScope.isEmpty() ) {
_scope->init( &_userScope );
}
_scope->setObject( "obj", const_cast< BSONObj & >( obj ) );
_scope->setBoolean( "fullObject" , true ); // this is a hack b/c fullObject used to be relevant
int err = _scope->invoke( _func, 0, &obj, 1000 * 60, false );
if ( err == -3 ) { // INVOKE_ERROR
stringstream ss;
ss << "error on invocation of $where function:\n"
<< _scope->getError();
uassert( 16812, ss.str(), false);
}
else if ( err != 0 ) { // ! INVOKE_SUCCESS
uassert( 16813, "unknown error in invocation of $where function", false);
}
return _scope->getBoolean( "__returnValue" ) != 0;
}
void WhereMatchExpression::debugString( StringBuilder& debug, int level ) const {
_debugAddSpace( debug, level );
debug << "$where\n";
_debugAddSpace( debug, level + 1 );
debug << "ns: " << _ns << "\n";
_debugAddSpace( debug, level + 1 );
debug << "code: " << _code << "\n";
_debugAddSpace( debug, level + 1 );
debug << "scope: " << _userScope << "\n";
}
bool WhereMatchExpression::equivalent( const MatchExpression* other ) const {
if ( matchType() != other->matchType() )
return false;
const WhereMatchExpression* realOther = static_cast<const WhereMatchExpression*>(other);
return
_ns == realOther->_ns &&
_code == realOther->_code &&
_userScope == realOther->_userScope;
}
// -----------------
StatusWithMatchExpression expressionParserWhereCallbackReal(const BSONElement& where) {
if ( !haveClient() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "no current client needed for $where" );
Client::Context* context = cc().getContext();
if ( !context )
return StatusWithMatchExpression( ErrorCodes::BadValue, "no context in $where parsing" );
const char* ns = context->ns();
if ( !ns )
return StatusWithMatchExpression( ErrorCodes::BadValue, "no ns in $where parsing" );
if ( !globalScriptEngine )
return StatusWithMatchExpression( ErrorCodes::BadValue, "no globalScriptEngine in $where parsing" );
auto_ptr<WhereMatchExpression> exp( new WhereMatchExpression() );
if ( where.type() == String || where.type() == Code ) {
Status s = exp->init( ns, where.valuestr(), BSONObj() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( exp.release() );
}
if ( where.type() == CodeWScope ) {
Status s = exp->init( ns,
where.codeWScopeCode(),
BSONObj( where.codeWScopeScopeDataUnsafe() ) );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( exp.release() );
}
return StatusWithMatchExpression( ErrorCodes::BadValue, "$where got bad type" );
}
MONGO_INITIALIZER( MatchExpressionWhere )( ::mongo::InitializerContext* context ) {
expressionParserWhereCallback = expressionParserWhereCallbackReal;
return Status::OK();
}
}
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