From e23e319cf019714912a00ff54f77acc144815807 Mon Sep 17 00:00:00 2001
From: SukkaW <isukkaw@gmail.com>
Date: Sat, 6 Oct 2018 22:51:48 +0800
Subject: [PATCH] feat: loadDisqus() and checkDisqus

---
 src/disqus.js | 78 +++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 67 insertions(+), 11 deletions(-)

diff --git a/src/disqus.js b/src/disqus.js
index 79fa45e..534e51a 100644
--- a/src/disqus.js
+++ b/src/disqus.js
@@ -14,6 +14,7 @@
  * disqusjs.config.url - The url of the page
  * disqusjs.config,api - Where to get data
  * disqusjs.config.apikey - The apikey used to request Disqus API
+ * disqusjs.config.mode - proxy | direct - Set which mode to use, should store and get in localStorage
  *
  * DisqusJS Info
  * disqusjs.page.id = The thread id, used at next API call
@@ -25,6 +26,60 @@
 disqusjs.page = {};
 var xhr = new XMLHttpRequest();
 
+/*
+ * Name: loadDisqus()
+ * Descriptin: load disqus as it should be.
+ */
+
+function loadDisqus() {
+    var d = document;
+    var s = d.createElement('script');
+    s.src = '//' + disqusjs.config.shortname + '.disqus.com/embed.js';
+    s.setAttribute('data-timestamp', + new Date());
+    (d.head || d.body).appendChild(s);
+}
+
+/*
+ * Name: checkDisqus()
+ * Description: Check disqus is avaliable for visitor or not
+ * How it works:
+    First check https://disqus.com/next/config.json is avaliable in 2000 or not.
+    Then check [shortname].disqus.com/favicon.ico is avaliable in 3000 or not.
+*/
+function checkDisqus() {
+    xhr.open('GET', 'https://disqus.com/next/config.json', true);
+    xhr.timeout = 2000;
+    xhr.send();
+    xhr.onload = function () {
+        if (this.status == 200 || this.status == 304) {
+            var img = new Image;
+            var checker = setTimeout(function () {
+                img.onerror = img.onload = null;
+                disqusjs.config.mode = 'proxy';
+            }, 2500);
+            img.onerror = function () {
+                clearTimeout(checker);
+                disqusjs.config.mode = 'proxy';
+                console.log(disqusjs)
+            };
+            img.onload = function () {
+                clearTimeout(checker);
+                disqusjs.config.mode = 'direct';
+                console.log(disqusjs)
+            };
+            img.src = "https://" + disqusjs.config.shortname + ".disqus.com/favicon.ico?" + +(new Date);
+        }
+    };
+    xhr.ontimeout = function (e) {
+        disqusjs.config.mode = 'proxy';
+        console.log(disqusjs)
+    };
+    xhr.onerror = function (e) {
+        disqusjs.config.mode = 'proxy';
+        console.log(disqusjs)
+    };
+}
+
 /*
  * Name: getThreadInfo()
  * Description: Disqus API only support get thread list by ID, not identifter. So get Thread ID before get thread list.
@@ -32,14 +87,13 @@ var xhr = new XMLHttpRequest();
  * API URI: /3.0/threads/list.json?forum=[disqus_shortname]&thread=ident:[identifier]&api_key=[apikey]
 */
 
-
 function getThreadInfo() {
-    var url = disqusjs.config.api + '3.0/threads/list.json?forum=' + disqusjs.config.shortname + '&thread=ident:'+ disqusjs.config.identifier + '&api_key=' + disqusjs.config.apikey;
+    var url = disqusjs.config.api + '3.0/threads/list.json?forum=' + disqusjs.config.shortname + '&thread=ident:' + disqusjs.config.identifier + '&api_key=' + disqusjs.config.apikey;
     xhr.open('GET', url, true);
     xhr.timeout = 4000;
     xhr.send();
-    xhr.onload = function() {
-        if (this.status == 200||this.status == 304) {
+    xhr.onload = function () {
+        if (this.status == 200 || this.status == 304) {
             var response = JSON.parse(this.responseText).response[0];
             disqusjs.page = {
                 id: response.id,
@@ -51,10 +105,10 @@ function getThreadInfo() {
             getComment();
         }
     };
-    xhr.ontimeout = function(e) {
+    xhr.ontimeout = function (e) {
         console.log(e)
     };
-    xhr.onerror = function(e) {
+    xhr.onerror = function (e) {
         console.log(e)
     };
 }
@@ -70,18 +124,20 @@ function getComment() {
     xhr.open('GET', url, true);
     xhr.timeout = 4000;
     xhr.send();
-    xhr.onload = function() {
-        if (this.status == 200||this.status == 304) {
+    xhr.onload = function () {
+        if (this.status == 200 || this.status == 304) {
             var response = JSON.parse(this.responseText);
             console.log(response);
         }
     };
-    xhr.ontimeout = function(e) {
+    xhr.ontimeout = function (e) {
         console.log(e)
     };
-    xhr.onerror = function(e) {
+    xhr.onerror = function (e) {
         console.log(e)
     };
 }
 
-getThreadInfo();
+checkDisqus();
+
+/* getThreadInfo(); */