Fixed 'Failed to verify username.'

Send first request without clientToken, store the returned clientToken, use that for subsequent requests. Dont generate random UUID for clientToken, it can sometimes be 'bad'.
Removed dependency 'uuid'.
Updated 'electron-builder'.

app/assets/js/authmanager.js

@@ -30,6 +30,9 @@ exports.addAccount = async function(username, password){
     try {
         const session = await Mojang.authenticate(username, password, ConfigManager.getClientToken())
         const ret = ConfigManager.addAuthAccount(session.selectedProfile.id, session.accessToken, username, session.selectedProfile.name)
+        if(ConfigManager.getClientToken() == null){
+            ConfigManager.setClientToken(session.clientToken)
+        }
         ConfigManager.save()
         return ret
     } catch (err){

app/assets/js/configmanager.js

@@ -2,7 +2,6 @@ const fs     = require('fs')
 const mkpath = require('mkdirp')
 const os     = require('os')
 const path   = require('path')
-const uuidV4 = require('uuid/v4')
 
 const logger = require('./loggerutil')('%c[ConfigManager]', 'color: #a02d2a; font-weight: bold')
 
@@ -68,7 +67,7 @@ const DEFAULT_CONFIG = {
     },
     commonDirectory: path.join(dataPath, 'common'),
     instanceDirectory: path.join(dataPath, 'instances'),
-    clientToken: uuidV4(),
+    clientToken: null,
     selectedServer: null, // Resolved
     selectedAccount: null,
     authenticationDatabase: {},

app/assets/js/mojang.js

@@ -133,16 +133,21 @@ exports.status = function(){
  */
 exports.authenticate = function(username, password, clientToken, requestUser = true, agent = minecraftAgent){
     return new Promise((resolve, reject) => {
+
+        const body = {
+            agent,
+            username,
+            password,
+            requestUser
+        }
+        if(clientToken != null){
+            body.clientToken = clientToken
+        }
+
         request.post(authpath + '/authenticate',
             {
                 json: true,
-                body: {
-                    agent,
-                    username,
-                    password,
-                    clientToken,
-                    requestUser
-                }
+                body
             },
             function(error, response, body){
                 if(error){

package-lock.json

@@ -134,28 +134,28 @@
       }
     },
     "app-builder-bin": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/app-builder-bin/-/app-builder-bin-2.2.0.tgz",
-      "integrity": "sha512-ckiG/zWjmCN6dtzOtx4g0Bno9qFlQFViwGoWKNNLUMRM33Fsq2fsSOMbK2JpqPJfAcPJOXPzoB2kcuUuIbIwwA==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/app-builder-bin/-/app-builder-bin-2.3.0.tgz",
+      "integrity": "sha512-jxquarsPVHkUMatxFZzuEmovy2pxaGCIsVqZiAIdQV7wm1Cbq3Jl+gsq26aMXFFIgsN19jCq2HCoXhVv+Mx7HA==",
       "dev": true
     },
     "app-builder-lib": {
-      "version": "20.31.1",
-      "resolved": "https://registry.npmjs.org/app-builder-lib/-/app-builder-lib-20.31.1.tgz",
-      "integrity": "sha512-YveVI7JYJPDreWRQkfRGdTBTxoFKhuslsoVcfNP1yQi+mx2UfRp4xFNOdTJdIoxbpYfmJ/llddD8fDNuTF4p/A==",
+      "version": "20.31.2",
+      "resolved": "https://registry.npmjs.org/app-builder-lib/-/app-builder-lib-20.31.2.tgz",
+      "integrity": "sha512-f5khvF27oGIGL6C4zJzsjbpVulfBAVIkqrumEmm1ZJQGqPdBZeIQz9FgolQJO0BQh0JOtfClyHMtsPlOXBV6/Q==",
       "dev": true,
       "requires": {
         "7zip-bin": "~4.1.0",
-        "app-builder-bin": "2.2.0",
+        "app-builder-bin": "2.3.0",
         "async-exit-hook": "^2.0.1",
         "bluebird-lst": "^1.0.6",
-        "builder-util": "7.2.1",
+        "builder-util": "8.0.0",
         "builder-util-runtime": "6.1.0",
         "chromium-pickle-js": "^0.2.0",
         "debug": "^4.1.0",
         "ejs": "^2.6.1",
         "electron-osx-sign": "0.4.11",
-        "electron-publish": "20.31.1",
+        "electron-publish": "20.31.2",
         "fs-extra-p": "^7.0.0",
         "hosted-git-info": "^2.7.1",
         "is-ci": "^1.2.1",
@@ -165,7 +165,7 @@
         "minimatch": "^3.0.4",
         "normalize-package-data": "^2.4.0",
         "plist": "^3.0.1",
-        "read-config-file": "3.1.2",
+        "read-config-file": "3.1.3",
         "sanitize-filename": "^1.6.1",
         "semver": "^5.6.0",
         "temp-file": "^3.1.3"
@@ -465,13 +465,13 @@
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A=="
     },
     "builder-util": {
-      "version": "7.2.1",
-      "resolved": "https://registry.npmjs.org/builder-util/-/builder-util-7.2.1.tgz",
-      "integrity": "sha512-40RhIM7dzvLht1jrUXhLYYXZZb5zCLKoG5pbdrNdsKncoBSQfOZ8dfCPVG0vgi1Ngh8kisbSVmHxss3nylJ1WQ==",
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/builder-util/-/builder-util-8.0.0.tgz",
+      "integrity": "sha512-hszhXrRZKfBf+178Y+QZCLwSH5UXgnDX+/q+fIRtFktCk5Dc9ipdvHAKPVfzhc5vhiw/eVDdFUUX8ShAQcyyBA==",
       "dev": true,
       "requires": {
         "7zip-bin": "~4.1.0",
-        "app-builder-bin": "2.2.0",
+        "app-builder-bin": "2.3.0",
         "bluebird-lst": "^1.0.6",
         "builder-util-runtime": "^6.1.0",
         "chalk": "^2.4.1",
@@ -925,14 +925,14 @@
       }
     },
     "dmg-builder": {
-      "version": "6.1.1",
-      "resolved": "https://registry.npmjs.org/dmg-builder/-/dmg-builder-6.1.1.tgz",
-      "integrity": "sha512-aMB7o/z0MmzwBHZzJDefmcH7bR98DinRyjT3TRs3Z2UKsjMiagQ4F9jGq50uqs4CnaHJ7aOfq3PcwBppdFMRiw==",
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/dmg-builder/-/dmg-builder-6.1.2.tgz",
+      "integrity": "sha512-zhU2toylQ4A82mtubyDBmP0KJnF+b7uXVX+xIJwDR5fsPzIJIT9Uy0x2cwmhMby+4KrPBqg3bMHrbGgIPX7MNw==",
       "dev": true,
       "requires": {
-        "app-builder-lib": "~20.31.1",
+        "app-builder-lib": "~20.31.2",
         "bluebird-lst": "^1.0.6",
-        "builder-util": "~7.2.1",
+        "builder-util": "~8.0.0",
         "fs-extra-p": "^7.0.0",
         "iconv-lite": "^0.4.24",
         "js-yaml": "^3.12.0",
@@ -1044,21 +1044,21 @@
       }
     },
     "electron-builder": {
-      "version": "20.31.1",
-      "resolved": "https://registry.npmjs.org/electron-builder/-/electron-builder-20.31.1.tgz",
-      "integrity": "sha512-a/V2QAVt0ZXFD/Lyqe0s1mqQ9funqznAYc9ygMjal+oUG6rXkhJRYVvvL+IT96coQeJKPtpc80F+SDi/PHFqlQ==",
+      "version": "20.31.2",
+      "resolved": "https://registry.npmjs.org/electron-builder/-/electron-builder-20.31.2.tgz",
+      "integrity": "sha512-X1Jie7261BFHuWpn4F2dtNlfWkaNkLXAsLgrYr5hWleWr0OYNEXuWowPkeLEFARKga4met41VkjYLurCtHpeXg==",
       "dev": true,
       "requires": {
-        "app-builder-lib": "20.31.1",
+        "app-builder-lib": "20.31.2",
         "bluebird-lst": "^1.0.6",
-        "builder-util": "7.2.1",
+        "builder-util": "8.0.0",
         "builder-util-runtime": "6.1.0",
         "chalk": "^2.4.1",
-        "dmg-builder": "6.1.1",
+        "dmg-builder": "6.1.2",
         "fs-extra-p": "^7.0.0",
         "is-ci": "^1.2.1",
         "lazy-val": "^1.0.3",
-        "read-config-file": "3.1.2",
+        "read-config-file": "3.1.3",
         "sanitize-filename": "^1.6.1",
         "update-notifier": "^2.5.0",
         "yargs": "^12.0.2"
@@ -1171,13 +1171,13 @@
       }
     },
     "electron-publish": {
-      "version": "20.31.1",
-      "resolved": "https://registry.npmjs.org/electron-publish/-/electron-publish-20.31.1.tgz",
-      "integrity": "sha512-R4p+BxuuDr40a7GyuW0xnRkFwmVuA4QkmwLAPl53+57utA9bw+NZ8ssKtbBFhVAXDI1s3aapT5vsok3F6VOPrw==",
+      "version": "20.31.2",
+      "resolved": "https://registry.npmjs.org/electron-publish/-/electron-publish-20.31.2.tgz",
+      "integrity": "sha512-5R8Nxnc/26BJbvFn2h3oD8aoMMxjE5CnPWm5j92Cuze+Ht7x6AoSDQAa1Cx6L19X/HSE3DWjTXEOe08SP3N/QA==",
       "dev": true,
       "requires": {
         "bluebird-lst": "^1.0.6",
-        "builder-util": "~7.2.1",
+        "builder-util": "~8.0.0",
         "builder-util-runtime": "^6.1.0",
         "chalk": "^2.4.1",
         "fs-extra-p": "^7.0.0",
@@ -1685,7 +1685,7 @@
     },
     "get-stream": {
       "version": "3.0.0",
-      "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
       "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ=",
       "dev": true
     },
@@ -1746,7 +1746,7 @@
     },
     "got": {
       "version": "6.7.1",
-      "resolved": "http://registry.npmjs.org/got/-/got-6.7.1.tgz",
+      "resolved": "https://registry.npmjs.org/got/-/got-6.7.1.tgz",
       "integrity": "sha1-JAzQV4WpoY5WHcG0S0HHY+8ejbA=",
       "dev": true,
       "requires": {
@@ -1980,7 +1980,7 @@
     },
     "is-obj": {
       "version": "1.0.1",
-      "resolved": "http://registry.npmjs.org/is-obj/-/is-obj-1.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/is-obj/-/is-obj-1.0.1.tgz",
       "integrity": "sha1-PkcprB9f3gJc19g6iW2rn09n2w8=",
       "dev": true
     },
@@ -2123,9 +2123,9 @@
       "integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus="
     },
     "json5": {
-      "version": "1.0.1",
-      "resolved": "http://registry.npmjs.org/json5/-/json5-1.0.1.tgz",
-      "integrity": "sha512-aKS4WQjPenRxiQsC93MNfjx+nbF4PAdYzmd/1JIj8HYzqfbu86beTuNgXDzPknWk0n0uARlyewZo4s++ES36Ow==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.0.tgz",
+      "integrity": "sha512-8Mh9h6xViijj36g7Dxi+Y4S6hNGV96vcJZr/SrlHh1LR/pEn/8j/+qIBbs44YKl69Lrfctp4QD+AdWLTMqEZAQ==",
       "dev": true,
       "requires": {
         "minimist": "^1.2.0"
@@ -2553,7 +2553,7 @@
     },
     "p-is-promise": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz",
       "integrity": "sha1-nJRWmJ6fZYgBewQ01WCXZ1w9oF4=",
       "dev": true
     },
@@ -2788,19 +2788,19 @@
       }
     },
     "read-config-file": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/read-config-file/-/read-config-file-3.1.2.tgz",
-      "integrity": "sha512-QCATYzlYHvmWps/W/eP7rcKuhYRYZg5XKeXFxSJRIXvn+KSw1+Ntz2et1aBz5TrEpawGrxWZ7zBipj+/v0xwWQ==",
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/read-config-file/-/read-config-file-3.1.3.tgz",
+      "integrity": "sha512-KVrZEmKOntnHqQFk69rw45A4oQ2npIMdKga4CcD8Yr38FQeYlE4S1JLFY9cll+vf0kVtSXDPperuQWEQto1jgQ==",
       "dev": true,
       "requires": {
-        "ajv": "^6.5.2",
+        "ajv": "^6.5.4",
         "ajv-keywords": "^3.2.0",
-        "bluebird-lst": "^1.0.5",
-        "dotenv": "^6.0.0",
+        "bluebird-lst": "^1.0.6",
+        "dotenv": "^6.1.0",
         "dotenv-expand": "^4.2.0",
-        "fs-extra-p": "^4.6.1",
+        "fs-extra-p": "^7.0.0",
         "js-yaml": "^3.12.0",
-        "json5": "^1.0.1",
+        "json5": "^2.1.0",
         "lazy-val": "^1.0.3"
       },
       "dependencies": {
@@ -2816,12 +2816,42 @@
             "uri-js": "^4.2.2"
           }
         },
+        "bluebird-lst": {
+          "version": "1.0.6",
+          "resolved": "https://registry.npmjs.org/bluebird-lst/-/bluebird-lst-1.0.6.tgz",
+          "integrity": "sha512-CBWFoPuUPpcvMUxfyr8DKdI5d4kjxFl1h39+VbKxP3KJWJHEsLtuT4pPLkjpxCGU6Ask21tvbnftWXdqIxYldQ==",
+          "dev": true,
+          "requires": {
+            "bluebird": "^3.5.2"
+          }
+        },
         "fast-deep-equal": {
           "version": "2.0.1",
           "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz",
           "integrity": "sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=",
           "dev": true
         },
+        "fs-extra": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-7.0.0.tgz",
+          "integrity": "sha512-EglNDLRpmaTWiD/qraZn6HREAEAHJcJOmxNEYwq6xeMKnVMAy3GUcFB+wXt2C6k4CNvB/mP1y/U3dzvKKj5OtQ==",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.2",
+            "jsonfile": "^4.0.0",
+            "universalify": "^0.1.0"
+          }
+        },
+        "fs-extra-p": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/fs-extra-p/-/fs-extra-p-7.0.0.tgz",
+          "integrity": "sha512-5tg5jBOd0xIXjwj4PDnafOXL5TyPVzjxLby4DPKev53wurEXp7IsojBaD4Lj5M5w7jxw0pbkEU0fFEPmcKoMnA==",
+          "dev": true,
+          "requires": {
+            "bluebird-lst": "^1.0.6",
+            "fs-extra": "^7.0.0"
+          }
+        },
         "json-schema-traverse": {
           "version": "0.4.1",
           "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
@@ -3212,7 +3242,7 @@
     },
     "strip-eof": {
       "version": "1.0.0",
-      "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
@@ -3692,7 +3722,7 @@
     },
     "wrap-ansi": {
       "version": "2.1.0",
-      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {

package.json

@@ -44,12 +44,11 @@
     "rimraf": "^2.6.2",
     "semver": "^5.6.0",
     "tar-fs": "^1.16.3",
-    "uuid": "^3.3.2",
     "winreg": "^1.2.4"
   },
   "devDependencies": {
     "electron": "^3.0.7",
-    "electron-builder": "^20.31.1",
+    "electron-builder": "^20.31.2",
     "eslint": "^5.8.0"
   },
   "build": {