mozilla-central/devtools/client/netmonitor/src/components/messages/parsers/signalr/HandshakeProtocol.js (file symbol)

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/*
* A helper class for working with SignalR handshakes.
*
* Copyright (c) .NET Foundation. All rights reserved.
*
* This source code is licensed under the Apache License, Version 2.0,
* found in the LICENSE.txt file in the root directory of the library
* source tree.
*
*/
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/** @private */
class HandshakeProtocol {
// Handshake request is always JSON
writeHandshakeRequest(handshakeRequest) {
return TextMessageFormat.TextMessageFormat.write(
JSON.stringify(handshakeRequest)
);
}
parseHandshakeResponse(data) {
let messageData;
let remainingData;
if (
Utils.isArrayBuffer(data) ||
// eslint-disable-next-line no-undef
(typeof Buffer !== "undefined" && data instanceof Buffer)
) {
// Format is binary but still need to read JSON text from handshake response
const binaryData = new Uint8Array(data);
const separatorIndex = binaryData.indexOf(
TextMessageFormat.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,
binaryData.slice(0, responseLength)
);
remainingData =
binaryData.byteLength > responseLength
? binaryData.slice(responseLength).buffer
: null;
} else {
const textData = data;
const separatorIndex = textData.indexOf(
TextMessageFormat.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.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;