actions/export_json.php

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<?php
class dataface_actions_export_json {
        function handle(&$params){
                $app =& Dataface_Application::getInstance();
                $query =& $app->getQuery();
                
                $records = df_get_selected_records($query);
                if ( !$records ){
                        if ( $query['-mode'] == 'list' ){
                                $records = df_get_records_array($query['-table'], $query);
                        } else {
                                $records = array( $app->getRecord() );
                        }
                }
                
                $displayMethod = 'val';
                if ( @$query['--displayMethod'] == 'display' ){
                        $displayMethod = 'display';
                } else if ( @$query['--displayMethod'] == 'htmlValue' ){
                        $displayMethod = 'htmlValue';
                }
                
                $out = array();
                if ( isset( $query['--fields'] ) ){
                        $fields = explode(' ', $query['--fields']);
                } else {
                        $fields = null;
                }
                
                foreach ($records as $record){
                        if ( !$record->checkPermission('export_json')  ){
                                continue;
                        }
                        
                        if ( is_array($fields) ){
                                $allowed_fields = array();
                                foreach ($fields as $field ){
                                        if ( !$record->checkPermission('export_json', array('field'=>$field) ) ){
                                                continue;
                                        }
                                        $allowed_fields[] = $field;
                                }
                        } else {
                                $allowed_fields = array_keys($record->table()->fields(false,true));
                        }
                        $row = array();
                        foreach ( $allowed_fields as $fld ){
                                $row[$fld] = $record->$displayMethod($fld);
                        }
                        $out[] = $row;
                }
                
                import('Services/JSON.php');
                $json = new Services_JSON;
                $enc_out = $json->encode($out);
                header('Content-type: application/json; charset='.$app->_conf['oe']);
                header('Connection: close');
                echo $enc_out;
                exit;
        }
}