added local showdown.min.js

swiftplugin/swiftplugin/static/js/src/swiftplugin.js

@@ -146,13 +146,20 @@ function SwiftPluginXBlock(runtime, element) {
 
     function updateProblemDescription(response) {
         const myAssigmentTextArea = document.getElementById("assigment-instructions-text");
+
+        if (!showdown) { 
+            return;
+        }
         const converter = new showdown.Converter();
         const html = converter.makeHtml(response.problem_description);
         myAssigmentTextArea.innerHTML = html;
     }
 
     function updateProblemTitle(response) {
         const myAssigmentTextArea = document.getElementById("assignment-title");
+        if (!showdown) { 
+            return;
+        }
         const converter = new showdown.Converter();
         const html = converter.makeHtml(response.problem_title);
         myAssigmentTextArea.innerHTML = html;

swiftplugin/swiftplugin/swiftplugin.py

@@ -115,7 +115,8 @@ def student_view(self, context=None):
         html = self.resource_string("static/html/swiftplugin.html")
         frag = Fragment(html.format(self=self))
 
-        frag.add_javascript_url("https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js")
+        # frag.add_javascript_url("https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js")
+        frag.add_javascript(self.resource_string("static/js/src/showdown.min.js"))
         frag.add_css(self.resource_string("static/css/swiftplugin.css"))
         frag.add_javascript(self.resource_string("static/js/src/swiftplugin.js"))
         frag.add_css(self.resource_string("static/css/bootstrap.min.css"))