Python: Reimplement py/use-of-input

Author: tausbn

python/ql/src/Expressions/UseofInput.ql

@@ -11,11 +11,11 @@
  */
 
 import python
+import semmle.python.dataflow.new.DataFlow
+import semmle.python.ApiGraphs
 
-from CallNode call, Context context, ControlFlowNode func
+from DataFlow::CallCfgNode call
 where
-  context.getAVersion().includes(2, _) and
-  call.getFunction() = func and
-  func.pointsTo(context, Value::named("input"), _) and
-  not func.pointsTo(context, Value::named("raw_input"), _)
+  call = API::builtin("input").getACall() and
+  call != API::builtin("raw_input").getACall()
 select call, "The unsafe built-in function 'input' is used in Python 2."