From ee0542256e87d80aca3953c6f31c1280e0e54658 Mon Sep 17 00:00:00 2001
From: Alexei Bendebury <alyosha.be@gmail.com>
Date: Tue, 23 Aug 2016 11:05:55 -0700
Subject: [PATCH 1/2] Trying to fix sri fallback

---
 quizApp/static/js/sri-fallback.js | 22 +++++++++++++++++-----
 quizApp/templates/layout.html     |  6 ++++++
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/quizApp/static/js/sri-fallback.js b/quizApp/static/js/sri-fallback.js
index d8d3cbd..3291cf5 100644
--- a/quizApp/static/js/sri-fallback.js
+++ b/quizApp/static/js/sri-fallback.js
@@ -1,11 +1,23 @@
 function resource_error(element) {
     var fallback_url = element.dataset.fallback;
+    console.log("Fallback: " + fallback_url);
     var is_js = fallback_url.substr(fallback_url.length - 3) == ".js";
-
-    if (is_js) {
-        document.write("<script src='" + fallback_url + "'></script>");
+    if(is_js) {
+        var script = document.createElement('script');
+        script.src = fallback_url;
+        document.head.appendChild(script);
     } else {
-        // Assume we have jquery loaded by now
-        $('head').append("<link href='" + fallback_url + "' rel='stylesheet'>");
+        var link = document.createElement('link');
+        link.href = fallback_url;
+        link.rel = "stylesheet";
+        document.head.appendChild(link);
+    }
+}
+
+function check_js_error(condition, fallback) {
+    if(!condition) {
+        var script = document.createElement('script');
+        script.src = fallback_url;
+        document.head.appendChild(script);
     }
 }
diff --git a/quizApp/templates/layout.html b/quizApp/templates/layout.html
index 18601d6..5c4d20c 100644
--- a/quizApp/templates/layout.html
+++ b/quizApp/templates/layout.html
@@ -24,6 +24,12 @@
           integrity="sha256-cCueBR6CsyA4/9szpPfrX3s49M9vUU5BgtiJj06wt/s="
           data-fallback="{{ url_for('static', filename='js/jquery.min.js') }}"
           crossorigin="anonymous" onerror="resource_error(this)"></script>
+    <!--
+    <script defer>
+      check_js_error(window.jQuery,
+      "{{ url_for('static', filename='js/jquery.min.js') }}")
+    </script>
+    -->
     <link rel="stylesheet"
           href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"
           integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"

From 95f6a3a8da6abda2ffd4b39b716354ceb9c8389b Mon Sep 17 00:00:00 2001
From: PlasmaSheep <plasmasheep@gmail.com>
Date: Wed, 14 Sep 2016 10:25:29 -0700
Subject: [PATCH 2/2] Trying to find sri solution

---
 quizApp/static/js/sri-fallback.js |  4 ++--
 quizApp/templates/layout.html     | 14 ++++++++++++--
 quizApp/templates/macros.html     | 20 ++++++++++++++++----
 3 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/quizApp/static/js/sri-fallback.js b/quizApp/static/js/sri-fallback.js
index 3291cf5..e51d4f9 100644
--- a/quizApp/static/js/sri-fallback.js
+++ b/quizApp/static/js/sri-fallback.js
@@ -17,7 +17,7 @@ function resource_error(element) {
 function check_js_error(condition, fallback) {
     if(!condition) {
         var script = document.createElement('script');
-        script.src = fallback_url;
-        document.head.appendChild(script);
+        script.src = fallback;
+        document.write("<script src='" + fallback + "></script>");
     }
 }
diff --git a/quizApp/templates/layout.html b/quizApp/templates/layout.html
index fa3b8b2..df21fd6 100644
--- a/quizApp/templates/layout.html
+++ b/quizApp/templates/layout.html
@@ -24,12 +24,10 @@
           integrity="sha256-cCueBR6CsyA4/9szpPfrX3s49M9vUU5BgtiJj06wt/s="
           data-fallback="{{ url_for('static', filename='js/jquery.min.js') }}"
           crossorigin="anonymous" onerror="resource_error(this)"></script>
-    <!--
     <script defer>
       check_js_error(window.jQuery,
       "{{ url_for('static', filename='js/jquery.min.js') }}")
     </script>
-    -->
     <link rel="stylesheet"
           href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"
           integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
@@ -40,6 +38,10 @@
             data-fallback="{{ url_for('static', filename='js/bootstrap.min.js') }}"
             integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa"
             crossorigin="anonymous" onerror="resource_error(this)"></script>
+    <script defer>
+      check_js_error(typeof $().emulateTransitionEnd == "function",
+      "{{ url_for('static', filename='js/bootstrap.min.js') }}")
+    </script>
     <link href="{{ url_for('static', filename='css/main.css') }}" rel="stylesheet">
     <script defer src="{{ url_for('static', filename='js/frame.js') }}"></script>
     <script defer src="{{ url_for('static', filename='js/common_ajax.js') }}"></script>
@@ -51,10 +53,18 @@
               integrity="sha384-FFgGfda92tXC8nCNOxrCQ3R8x1TNkMFqDZVQdDaaJiiVbjkPBXIJBx0o7ETjy8Bh"
               data-fallback="{{ url_for('static', filename='js/html5shiv.min.js') }}"
               crossorigin="anonymous" onerror="resource_error(this)"></script>
+      <script defer>
+        check_js_error(window.html5,
+        "{{ url_for('static', filename='js/bootstrap.min.js') }}")
+      </script>
       <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"
               integrity="sha384-ZoaMbDF+4LeFxg6WdScQ9nnR1QC2MIRxA1O9KWEXQwns1G8UNyIEZIQidzb0T1fo"
               data-fallback="{{ url_for('static', filename='js/respond.min.js') }}"
               crossorigin="anonymous" onerror="resource_error(this)"></script>
+      <script defer>
+        check_js_error(respond,
+        "{{ url_for('static', filename='js/respond.min.js') }}")
+      </script>
     <![endif]-->
     {% block head %}{% endblock %}
   </head>
diff --git a/quizApp/templates/macros.html b/quizApp/templates/macros.html
index efd6955..342af40 100644
--- a/quizApp/templates/macros.html
+++ b/quizApp/templates/macros.html
@@ -209,7 +209,11 @@
         defer
         integrity="sha384-ohw6o2vy/chIavW0iVsUoWaIPmAnF9VKjEMSusADB79PrE3CdeJhvR84BjcynjVl"
         data-fallback="{{ url_for('static', filename='js/moment.min.js') }}"
-        crossorigin="anonymous" onerror="resource_error(this)"></script>
+        crossorigin="anonymous"></script>
+<script defer>
+check_js_error(moment,
+      "{{ url_for('static', filename='js/bootstrap.min.js') }}")
+</script>
 <script src="{{ url_for('static', filename='js/bootstrap-datetimepicker.min.js') }}"
         defer></script>
 <script defer src="{{ url_for('static', filename='js/form.js') }}"></script>
@@ -223,12 +227,20 @@
         integrity="sha384-89aj/hOsfOyfD0Ll+7f2dobA15hDyiNb8m1dJ+rJuqgrGR+PVqNU8pybx4pbF3Cc"
         data-fallback="{{ url_for('static', filename='js/jquery.dataTables.min.js') }}"
         defer
-        crossorigin="anonymous" onerror="resource_error(this)"></script>
+        crossorigin="anonymous"></script>
+<script defer>
+check_js_error(jQuery().DataTable,
+      "{{ url_for('static', filename='js/jquery.dataTables.min.js') }}")
+</script>
 <script src="https://cdn.datatables.net/1.10.12/js/dataTables.bootstrap.min.js"
-        integrity="sha384-SR1gffNfWzqensZ3u8O8AkytPBwtg4pKQuOrHUvvCuAxqcoAE4LWPryg4o+1Y9uP"
+        integrity="sha384-SR1gfNfWzqensZ3u8O8AkytPBwtg4pKQuOrHUvvCuAxqcoAE4LWPryg4o+1Y9uP"
         data-fallback="{{ url_for('static', filename='js/dataTables.bootstrap.min.js') }}"
         defer
-        crossorigin="anonymous" onerror="resource_error(this)"></script>
+        crossorigin="anonymous"></script>
+<script defer>
+check_js_error($.fn.dataTable.ext.renderer.pageButton.bootstrap,
+      "{{ url_for('static', filename='js/dataTables.bootstrap.min.js') }}")
+</script>
 <link rel="stylesheet"
       href="https://cdn.datatables.net/1.10.12/css/dataTables.bootstrap.min.css"
       data-fallback="{{ url_for('static', filename='js/dataTables.bootstrap.min.js') }}"