@microsoft/signalr/dist/esm/HandshakeProtocol.js

ASP.NET Core SignalR Client

// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
import { TextMessageFormat } from "./TextMessageFormat";
import { isArrayBuffer } from "./Utils";
/** @private */
var HandshakeProtocol = /** @class */ (function () {
    function HandshakeProtocol() {
    }
    // Handshake request is always JSON
    HandshakeProtocol.prototype.writeHandshakeRequest = function (handshakeRequest) {
        return TextMessageFormat.write(JSON.stringify(handshakeRequest));
    };
    HandshakeProtocol.prototype.parseHandshakeResponse = function (data) {
        var responseMessage;
        var messageData;
        var remainingData;
        if (isArrayBuffer(data) || (typeof Buffer !== "undefined" && data instanceof Buffer)) {
            // Format is binary but still need to read JSON text from handshake response
            var binaryData = new Uint8Array(data);
            var separatorIndex = binaryData.indexOf(TextMessageFormat.RecordSeparatorCode);
            if (separatorIndex === -1) {
                throw new Error("Message is incomplete.");
            }
            // content before separator is handshake response
            // optional content after is additional messages
            var responseLength = separatorIndex + 1;
            messageData = String.fromCharCode.apply(null, binaryData.slice(0, responseLength));
            remainingData = (binaryData.byteLength > responseLength) ? binaryData.slice(responseLength).buffer : null;
        }
        else {
            var textData = data;
            var separatorIndex = textData.indexOf(TextMessageFormat.RecordSeparator);
            if (separatorIndex === -1) {
                throw new Error("Message is incomplete.");
            }
            // content before separator is handshake response
            // optional content after is additional messages
            var responseLength = separatorIndex + 1;
            messageData = textData.substring(0, responseLength);
            remainingData = (textData.length > responseLength) ? textData.substring(responseLength) : null;
        }
        // At this point we should have just the single handshake message
        var messages = TextMessageFormat.parse(messageData);
        var response = JSON.parse(messages[0]);
        if (response.type) {
            throw new Error("Expected a handshake response from the server.");
        }
        responseMessage = response;
        // multiple messages could have arrived with handshake
        // return additional data to be parsed as usual, or null if all parsed
        return [remainingData, responseMessage];
    };
    return HandshakeProtocol;
}());
export { HandshakeProtocol };
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