revert(api): decouple api from curriculum

This reverts commit c077ffe4b9
via PR #40703

api-server/server/utils/validators.js

@@ -0,0 +1,30 @@
+// Refer : http://stackoverflow.com/a/430240/1932901
+function trimTags(value) {
+  const tagBody = '(?:[^"\'>]|"[^"]*"|\'[^\']*\')*';
+  const tagOrComment = new RegExp(
+    '<(?:' +
+      // Comment body.
+      '!--(?:(?:-*[^->])*--+|-?)' +
+      // Special "raw text" elements whose content should be elided.
+      '|script\\b' +
+      tagBody +
+      '>[\\s\\S]*?</script\\s*' +
+      '|style\\b' +
+      tagBody +
+      '>[\\s\\S]*?</style\\s*' +
+      // Regular name
+      '|/?[a-z]' +
+      tagBody +
+      ')>',
+    'gi'
+  );
+  let rawValue;
+  do {
+    rawValue = value;
+    value = value.replace(tagOrComment, '');
+  } while (value !== rawValue);
+
+  return value.replace(/</g, '&lt;');
+}
+
+export { trimTags };