Fingerprint calculation is updated to avoid exceptions on Windows 7

.travis.yml

@@ -1,27 +1,10 @@
-dist: trusty
-sudo: required
+dist: focal
 language: node_js
 node_js:
-  - "6"
-  - "8"
-  - "9"
+  - 'lts/*'
+install:
+  - npm install --legacy-peer-deps
 
 addons:
-  firefox: latest
-  apt:
-    sources:
-     - google-chrome
-    packages:
-     - google-chrome-stable fluxbox
-
-before_script:
-  - "export DISPLAY=:99.0"
-  - "sh -e /etc/init.d/xvfb start"
-  - sleep 3
-  - fluxbox >/dev/null 2>&1 &
-
-env:
-  global:
-    - secure: ZaVxQhRv9HYXTCqeS9T4XXGO1cGayL11os8jDZ6wqNkQAwkOw3QSL70iloN5DMzg4WXv8Pwp5I4EUDIcUwiu4UCbDgfn1vYoTfVEmDMBDni4xw3CRG7IT8gEijJItCaOdEzC+IBmpAFuVI8xcuic7WBYPKRnShWkZ1xwmHDSenc=
-    - secure: lh7gaH4G4RUvdjrocupakeFbx4JtF7AyLGXGfsJl+/PJFjvrB+Ahatb8sTcb5hDHTr+Ucunzawx1HBNE+k+7CyykKBQpsQNWT/q6vlL/PAjRpt501O46NEdfTm/RSTqHgIo9WINYIa/ZpCh2L0vAevduaT0GGFCaP9W7fpJaVhM=
-    - CHROME_BIN=/usr/bin/google-chrome-stable
+   firefox: latest
+   chrome: stable

lib/fingerprint.js

@@ -1,17 +1,34 @@
 var pad = require('./pad.js');
+var os = require('os');
 
-var os = require('os'),
-    padding = 2,
-    pid = pad(process.pid.toString(36), padding),
-    hostname = os.hostname(),
-    length = hostname.length,
-    hostId = pad(hostname
-      .split('')
-      .reduce(function (prev, char) {
-        return +prev + char.charCodeAt(0);
-      }, +length + 36)
-      .toString(36),
-    padding);
+function getHostname () {
+  try {
+    return os.hostname();
+  } catch (e) {
+    /**
+     * This is most likely Windows 7 which is known to cause os.hostname() to break
+     * @see https://github.com/nodejs/node/issues/41297
+     * @see https://github.com/libuv/libuv/issues/3260
+     *
+     * Fallback to take hostname from environment variables
+     * @see https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/hostname#notes
+     */
+    // eslint-disable-next-line no-underscore-dangle
+    return process.env._CLUSTER_NETWORK_NAME_ || process.env.COMPUTERNAME || 'hostname';
+  }
+}
+
+var padding = 2,
+  pid = pad(process.pid.toString(36), padding),
+  hostname = getHostname(),
+  length = hostname.length,
+  hostId = pad(hostname
+    .split('')
+    .reduce(function (prev, char) {
+      return +prev + char.charCodeAt(0);
+    }, +length + 36)
+    .toString(36),
+  padding);
 
 module.exports = function fingerprint () {
   return pid + hostId;