Fix jQuery challenges

client/commonFramework/detect-unsafe-code-stream.js

@@ -0,0 +1,55 @@
+window.common = (function(global) {
+  const {
+    Rx: { Observable },
+    common = { init: [] }
+  } = global;
+
+  const detectFunctionCall = /function\s*?\(|function\s+\w+\s*?\(/gi;
+  const detectUnsafeJQ = /\$\s*?\(\s*?\$\s*?\)/gi;
+  const detectUnsafeConsoleCall = /if\s\(null\)\sconsole\.log\(1\);/gi;
+
+  common.detectUnsafeCode$ = function detectUnsafeCode$(code) {
+    const openingComments = code.match(/\/\*/gi);
+    const closingComments = code.match(/\*\//gi);
+
+    // checks if the number of opening comments(/*) matches the number of
+    // closing comments(*/)
+    if (
+      openingComments &&
+      (
+        !closingComments ||
+        openingComments.length > closingComments.length
+      )
+    ) {
+
+      return Observable.throw(
+        new Error('SyntaxError: Unfinished multi-line comment')
+      );
+    }
+
+    if (code.match(detectUnsafeJQ)) {
+      return Observable.throw(
+        new Error('Unsafe $($)')
+      );
+    }
+
+    if (
+      code.match(/function/g) &&
+      !code.match(detectFunctionCall)
+    ) {
+      return Observable.throw(
+        new Error('SyntaxError: Unsafe or unfinished function declaration')
+      );
+    }
+
+    if (code.match(detectUnsafeConsoleCall)) {
+      return Observable.throw(
+        new Error('Invalid if (null) console.log(1); detected')
+      );
+    }
+
+    return Observable.just(code);
+  };
+
+  return common;
+}(window));