@microsoft/signalr
Version:
ASP.NET Core SignalR Client
55 lines • 2.85 kB
JavaScript
;
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
Object.defineProperty(exports, "__esModule", { value: true });
exports.HandshakeProtocol = void 0;
const TextMessageFormat_1 = require("./TextMessageFormat");
const Utils_1 = require("./Utils");
/** @private */
class HandshakeProtocol {
// Handshake request is always JSON
writeHandshakeRequest(handshakeRequest) {
return TextMessageFormat_1.TextMessageFormat.write(JSON.stringify(handshakeRequest));
}
parseHandshakeResponse(data) {
let messageData;
let remainingData;
if ((0, Utils_1.isArrayBuffer)(data)) {
// Format is binary but still need to read JSON text from handshake response
const binaryData = new Uint8Array(data);
const separatorIndex = binaryData.indexOf(TextMessageFormat_1.TextMessageFormat.RecordSeparatorCode);
if (separatorIndex === -1) {
throw new Error("Message is incomplete.");
}
// content before separator is handshake response
// optional content after is additional messages
const responseLength = separatorIndex + 1;
messageData = String.fromCharCode.apply(null, Array.prototype.slice.call(binaryData.slice(0, responseLength)));
remainingData = (binaryData.byteLength > responseLength) ? binaryData.slice(responseLength).buffer : null;
}
else {
const textData = data;
const separatorIndex = textData.indexOf(TextMessageFormat_1.TextMessageFormat.RecordSeparator);
if (separatorIndex === -1) {
throw new Error("Message is incomplete.");
}
// content before separator is handshake response
// optional content after is additional messages
const 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
const messages = TextMessageFormat_1.TextMessageFormat.parse(messageData);
const response = JSON.parse(messages[0]);
if (response.type) {
throw new Error("Expected a handshake response from the server.");
}
const 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];
}
}
exports.HandshakeProtocol = HandshakeProtocol;
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