@xmpp/resolve/lib/alt-connections.js

XMPP connection methods resolution for JavaScript

"use strict";

function isSecure(uri) {
  return uri.startsWith("https") || uri.startsWith("wss");
}

module.exports.compare = function compare(a, b) {
  let secure;
  if (isSecure(a.uri) && !isSecure(b.uri)) {
    secure = -1;
  } else if (!isSecure(a.uri) && isSecure(b.uri)) {
    secure = 1;
  } else {
    secure = 0;
  }

  if (secure !== 0) {
    return secure;
  }

  let method;
  if (a.method === b.method) {
    method = 0;
  } else if (a.method === "websocket") {
    method = -1;
  } else if (b.method === "websocket") {
    method = 1;
  } else if (a.method === "xbosh") {
    method = -1;
  } else if (b.method === "xbosh") {
    method = 1;
  } else if (a.method === "httppoll") {
    method = -1;
  } else if (b.method === "httppoll") {
    method = 1;
  } else {
    method = 0;
  }

  if (method !== 0) {
    return method;
  }

  return 0;
};