GH-191: Allow loading CMS data via CMS script

So that Portal and Docs need not reinvent the wheel.

taccsite_cms/static/site_cms/js/modules/importData.js

@@ -0,0 +1,32 @@
+/**
+ * Return data from an endpoint
+ * @param {string} dataURL - The URL from which to get the data
+ * @param {('html'|'json'|'text')} dataType - The type of data to retrieve
+ * @returns {Promise<string>} Promise that returns markup if resolved
+ */
+export function getFromURL(dataURL, dataType) {
+  const isValidURL = (dataURL && typeof dataURL === 'string');
+
+  if (isValidURL) {
+    return fetch(dataURL).then(response => {
+      let data;
+
+      switch (dataType) {
+        case 'json':
+          data = response.json();
+          break;
+        case 'html':
+        case 'text':
+        default:
+          data = response.text();
+          break;
+      }
+
+      return data;
+    }).catch(err => {
+      console.error(err);
+    });
+  } else {
+    return Promise.reject(new Error('Invalid URL provided'));
+  }
+}

taccsite_cms/static/site_cms/js/modules/importHTML.js

@@ -1,3 +1,5 @@
+import { getFromURL as getDataFromURL } from './importData.js';
+
 /**
  * Create element from HTML string
  * @param {String} - HTML representing a single element
@@ -29,16 +31,7 @@ export function htmlToElements(html) {
  * @returns {Promise<string>} Promise that returns markup if resolved
  */
 export function getFromURL(markupURL) {
-  if (markupURL) {
-    return fetch(markupURL).then(response => {
-      const markup = response.text();
-      return markup;
-    }).catch(err => {
-      console.error(err);
-    });
-  } else {
-    return Promise.reject(new Error('Invalid `markupURL` provided'));
-  }
+  return getDataFromURL(markupURL, 'html');
 }
 
 /**

taccsite_cms/static/static

@@ -0,0 +1 @@
+../../Core-CMS/taccsite_cms/static