From 66a3854a2459015f35fa22771984b8e33a2476d7 Mon Sep 17 00:00:00 2001
From: Daniel Scalzi <d_scalzi@yahoo.com>
Date: Sat, 14 Apr 2018 18:42:45 -0400
Subject: [PATCH] Better error handling with Mojang REST api.

Added handling for when there is no internet connection or Mojang's auth server is unreachable to both the login and status modules.
---
 app/assets/js/actionbinder.js |  9 +++---
 app/assets/js/mojang.js       | 55 +++++++++++++++++++++++++----------
 app/login.ejs                 | 34 ++++++++++++++++++++--
 3 files changed, 74 insertions(+), 24 deletions(-)

diff --git a/app/assets/js/actionbinder.js b/app/assets/js/actionbinder.js
index 965be884..2daa2962 100644
--- a/app/assets/js/actionbinder.js
+++ b/app/assets/js/actionbinder.js
@@ -62,8 +62,8 @@ document.addEventListener('readystatechange', function(){
         // Update Mojang Status Color
         const refreshMojangStatuses = async function(){
             console.log('Refreshing Mojang Statuses..')
+            let status = 'grey'
             try {
-                let status = 'grey'
                 const statuses = await Mojang.status()
                 greenCount = 0
                 for(let i=0; i<statuses.length; i++){
@@ -79,12 +79,11 @@ document.addEventListener('readystatechange', function(){
                 if(greenCount == statuses.length){
                     status = 'green'
                 }
-
-                document.getElementById('mojang_status_icon').style.color = Mojang.statusToHex(status)
-
             } catch (err) {
-                console.error('Unable to refresh Mojang service status..', err)
+                console.warn('Unable to refresh Mojang service status.')
+                console.debug(err)
             }
+            document.getElementById('mojang_status_icon').style.color = Mojang.statusToHex(status)
         }
 
         refreshMojangStatuses()
diff --git a/app/assets/js/mojang.js b/app/assets/js/mojang.js
index ececed23..0cdd6774 100644
--- a/app/assets/js/mojang.js
+++ b/app/assets/js/mojang.js
@@ -75,7 +75,12 @@ exports.status = function(){
             json: true
         },
         function(error, response, body){
-            if(response.statusCode === 200){
+
+            if(error || response.statusCode !== 200){
+                console.warn('Unable to retrieve Mojang status.')
+                console.debug('Error while retrieving Mojang statuses:', error)
+                reject(error || response.statusCode)
+            } else {
                 for(let i=0; i<body.length; i++){
                     const key = Object.keys(body[i])[0]
                     inner:
@@ -87,8 +92,6 @@ exports.status = function(){
                     }
                 }
                 fulfill(statuses)
-            } else {
-                reject()
             }
         })
     })
@@ -119,10 +122,15 @@ exports.authenticate = function(username, password, clientToken, requestUser = t
             }
         },
         function(error, response, body){
-            if(response.statusCode === 200){
-                fulfill(body)
+            if(error){
+                console.error('Error during authentication.', error)
+                reject(error)
             } else {
-                reject(body)
+                if(response.statusCode === 200){
+                    fulfill(body)
+                } else {
+                    reject(body || {code: 'ENOTFOUND'})
+                }
             }
         })
     })
@@ -148,11 +156,16 @@ exports.validate = function(accessToken, clientToken){
             }
         },
         function(error, response, body){
-            if(response.statusCode === 403){
-                fulfill(false)
+            if(error){
+                console.error('Error during validation.', error)
+                reject(error)
             } else {
-                // 204 if valid
-                fulfill(true)
+                if(response.statusCode === 403){
+                    fulfill(false)
+                } else {
+                    // 204 if valid
+                    fulfill(true)
+                }
             }
         })
     })
@@ -178,10 +191,15 @@ exports.invalidate = function(accessToken, clientToken){
             }
         },
         function(error, response, body){
-            if(response.statusCode === 200){
-                fulfill()
+            if(error){
+                console.error('Error during invalidation.', error)
+                reject(error)
             } else {
-                reject()
+                if(response.statusCode === 204){
+                    fulfill()
+                } else {
+                    reject(body)
+                }
             }
         })
     })
@@ -210,10 +228,15 @@ exports.refresh = function(accessToken, clientToken, requestUser = true){
             }
         },
         function(error, response, body){
-            if(response.statusCode === 200){
-                fulfill(body)
+            if(error){
+                console.error('Error during refresh.', error)
+                reject(error)
             } else {
-                reject(response.body)
+                if(response.statusCode === 200){
+                    fulfill(body)
+                } else {
+                    reject(body)
+                }
             }
         })
     })
diff --git a/app/login.ejs b/app/login.ejs
index 57311c49..28ee045c 100644
--- a/app/login.ejs
+++ b/app/login.ejs
@@ -180,6 +180,8 @@
         }
 
         function resolveError(err){
+            // Mojang Response => err.cause | err.error | err.errorMessage
+            // Node error => err.code | err.message
             if(err.cause != null && err.cause === 'UserMigratedException') {
                 return {
                     title: 'Error During Login:<br>Invalid Credentials',
@@ -202,11 +204,37 @@
                             }
                         }
                     }
+                } else {
+                    // Request errors (from Node).
+                    if(err.code != null){
+                        if(err.code === 'ENOENT'){
+                            // No Internet.
+                            return {
+                                title: 'Error During Login:<br>No Internet Connection',
+                                desc: 'You must be connected to the internet in order to login. Please connect and try again.'
+                            }
+                        } else if(err.code === 'ENOTFOUND'){
+                            // Could not reach server.
+                            return {
+                                title: 'Error During Login:<br>Authentication Server Offline',
+                                desc: 'Mojang\'s authentication server is currently offline or unreachable. Please wait a bit and try again. You can check the status of the server on <a href="https://help.mojang.com/">Mojang\'s help portal</a>.'
+                            }
+                        }
+                    }
                 }
             }
-            return {
-                title: err.error,
-                desc: err.errorMessage
+            if(err.message != null){
+                // Unknown error with request.
+                return {
+                    title: 'Error During Login:<br>Unknown Error',
+                    desc: err.message
+                }
+            } else {
+                // Unknown Mojang error.
+                return {
+                    title: err.error,
+                    desc: err.errorMessage
+                }
             }
         }