@sap/xsodata/lib/uri/checks/checkFilterOnAggregatedColumn.js

Expose data from a HANA database as OData V2 service with help of .xsodata files.

'use strict';

const Http400_BadRequest = require('../../utils/errors/http/badRequest');

module.exports = function checkFilterOnAggregatedColumn(context, callback) {
    const aggs = context.oData.dbSegmentLast.entityType.getAggregates();
    const filter = context.oData.systemQueryParameters.filter;

    if (aggs.length === 0 || !filter) {
        return callback(null, context);
    }

    if (check(aggs, filter)) {
        return callback(createError(), context);
    }

    return callback(null, context);
};

function createError() {
    const errorMessage = '$filter is not allowed for aggregated columns.';
    return new Http400_BadRequest(errorMessage);
}

function check(aggs, type) {
    let violation = aggs.some(function (agg) {
        return agg.column === type.property;
    });

    if (!violation) {
        violation = type.getChildren().some(check.bind(null, aggs));
    }

    return violation;
}