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

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

'use strict';

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

module.exports = function checkFilterOrderByOnGenKeyColumn(context, callback) {
    var genKey;

    if(context.oData.dbSegmentLast.entityType.hasGeneratedKey()){
        genKey = context.oData.dbSegmentLast.entityType.keys.generatedKey;
    }

    var filter = context.oData.systemQueryParameters.filter;
    var orderBy = context.oData.systemQueryParameters.orderby;

    if (!genKey || (!filter && !orderBy)){
        return callback(null, context);
    }

    if(filter && check(genKey, filter)){
        return callback(createError('filter'), context);
    }

    if(orderBy && check(genKey, orderBy)){
        return callback(createError('orderby'), context);
    }

    return callback(null, context);

};

function createError(sqo) {
    var errorMessage = '$' + sqo + ' is not allowed for generated key columns.';
    return new Http400_BadRequest(errorMessage);
}

function check(genKey, type){
    var violation = genKey === type.property;

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

    return violation;
}