# Code coverage report for lib/services/client/write.js

## Statements: 97.73% (43 / 44) Branches: 92.86% (13 / 14) Functions: 100% (10 / 10) Lines: 97.73% (43 / 44)

All files » lib/services/client/ » write.js

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    1/*
     * Copyright 2014 Telefonica Investigación y Desarrollo, S.A.U
     *
     * This file is part of iotagent-lwm2m-lib
     *
     * iotagent-lwm2m-lib is free software: you can redistribute it and/or
     * modify it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the License,
     * or (at your option) any later version.
     *
     * iotagent-lwm2m-lib 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 iotagent-lwm2m-lib.
     * If not, seehttp://www.gnu.org/licenses/.
     *
     * For those usages not covered by the GNU Affero General Public License
     * please contact with::[contacto@tid.es]
     */

    'use strict';

    var async = require('async'),
        apply = async.apply,
        objectRegistry = require('./objectRegistry');

    /**
     * Extract Object type, id and payload from the request URI, returning it using the callback.
     *
     * @param {Object} req          Arriving COAP Request to be handled.
     * @param {Object} res          Outgoing COAP Response.
     */

    function extractUriInfo(req, res, callback) {
        var element,
            elementList = [],
            objectType,
            objectInstance,
            resourceId,
            objectUri,
            payload = req.payload.toString('utf8'),
            currentPath = req.urlObj.pathname;

        /* jshint -W084 */
        while (element = currentPath.match(/\/\d+/)) {
            elementList.push(element[0].substr(1));
            currentPath = currentPath.substr(element[0].length);
        }
        /* jshint +W084 */

        objectType = elementList[0];
        objectInstance = elementList[1];
        resourceId = elementList[2];

        if (objectInstance) {
            objectUri = '/' + objectType + '/' + objectInstance;
        } else {
            objectUri = '/' + objectType;
        }

        callback(null, objectUri, resourceId, payload);
    }

    /**
     * Invoke the user handler for this operation, with all the information from the query parameters as its arguments.
     *
     * @param {Object} queryParams      Object containing all the query parameters.
     * @param {Function} handler        User handler to be invoked.
     */
    function applyHandler(resourceId, attributeValue, handler, storedObject, callback) {
        handler(storedObject.objectType, storedObject.objectId, resourceId, attributeValue, callback);
    }

    /**
     * Generates the end of request handler that will generate the final response to the COAP Client.
     *
     * @param {Object} req          Arriving COAP Request to be handled.
     * @param {Object} res          Outgoing COAP Response.
     * @returns {Function}          Request handler, receiving an optional error and the write operation result.
     */
    function endWrite(req, res) {
        return function (error, result) {
            if (error) {
                res.code = error.code;
                res.end('');
            } else {
                res.code = '2.04';
                res.end('');
            }
        };
    }

    function writeAttributes(objectUri, resourceId, query, callback) {
        function split(pair) {
            return pair.split('=');
        }

        function group(previous, current) {
            if (current && current.length === 2) {
                previous[current[0]] = current[1];
            }

            return previous;
        }

        var attributes = query.split('&').map(split).reduce(group, {});

        if (resourceId) {
            objectRegistry.setAttributes(objectUri + '/' + resourceId, attributes, callback);
        } else {
            objectRegistry.setAttributes(objectUri, attributes, callback);
        }
    }

    function write(objectUri, resourceId, payload, handler, callback) {
        async.waterfall([
            apply(objectRegistry.setResource, objectUri, resourceId, payload),
            apply(applyHandler, resourceId, payload, handler)
        ], callback);
    }

    /**
     * Handle the write operation.
     *
     * @param {Object} req          Arriving COAP Request to be handled.
     * @param {Object} res          Outgoing COAP Response.
     * @param {Function} handler    User handler to be executed if everything goes ok.
     */
    function handleWrite(req, res, handler) {
        extractUriInfo(req, res, function (error, objectUri, resourceId, payload) {
            Iif (error) {
                endWrite(req, res)(error);
            } else {
                if (req.url.indexOf('?') > 0) {
                    writeAttributes(objectUri, resourceId, req.urlObj.query, endWrite(req, res));
                } else {
                    write(objectUri, resourceId, payload, handler, endWrite(req, res));
                }
            }
        });
    }

    exports.handle = handleWrite;