global.WebSocketNode.js Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of libjoynr-js Show documentation
JOYnr JavaScript libjoynr-js
The newest version!
/*
 * #%L
 * %%
 * Copyright (C) 2011 - 2017 BMW Car IT GmbH
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

/**
 * Adapts the nodejs websocket lib WebSocket-Node to the WebSocket client API.
 * See: http://dev.w3.org/html5/websockets/#the-websocket-interface
 *
 */
const JoynrRuntimeException = require("../joynr/exceptions/JoynrRuntimeException");
const UtilInternal = require("../joynr/util/UtilInternal.js");
const MessageSerializer = require("../joynr/messaging/MessageSerializer");
const ws = require("ws");

if (typeof Buffer !== "function") {
    throw new JoynrRuntimeException("Decoding of binary websocket messages not possible. Buffer not available.");
}

function WebSocketNodeWrapper(remoteUrl, keychain, useUnencryptedTls) {
    const clientOptions = {};
    if (keychain) {
        clientOptions.cert = keychain.tlsCert;
        clientOptions.key = keychain.tlsKey;
        clientOptions.ca = keychain.tlsCa;
        clientOptions.rejectUnauthorized = true;
        clientOptions.checkServerIdentity = keychain.checkServerIdentity;
    }
    if (useUnencryptedTls) {
        clientOptions.ciphers = "eNULL";
    }

    const webSocketObj = new ws(remoteUrl, clientOptions);

    webSocketObj.encodeString = function(string) {
        return Buffer.from(string);
    };
    webSocketObj.decodeEventData = function(data) {
        return data;
    };

    webSocketObj.marshalJoynrMessage = function(data) {
        return MessageSerializer.stringify(data);
    };
    webSocketObj.unmarshalJoynrMessage = function(event, callback) {
        const joynrMessage = MessageSerializer.parse(event.data);
        if (joynrMessage) {
            callback(joynrMessage);
        }
    };

    return webSocketObj;
}

UtilInternal.extend(WebSocketNodeWrapper, ws);

module.exports = WebSocketNodeWrapper;