JS: refactor DefaultUrlRequest: extract the http library

javascript/ql/src/semmle/javascript/frameworks/UrlRequests.qll

@@ -68,12 +68,6 @@ private class DefaultUrlRequest extends CustomUrlRequest {
         url = getArgument(0)
       )
       or
-      (
-        (moduleName = "http" or moduleName = "https") and
-        callee = DataFlow::moduleMember(moduleName, httpMethodName()) and
-        url = getArgument(0)
-      )
-      or
       (
         moduleName = "got" and
         (
@@ -186,3 +180,26 @@ private class FetchUrlRequest extends CustomUrlRequest {
   }
 
 }
+
+
+/**
+ * A model of a URL request in the Node.js `http` library.
+ */
+private class NodeHttpUrlRequest extends CustomUrlRequest {
+
+  DataFlow::Node url;
+
+  NodeHttpUrlRequest() {
+    exists (string moduleName, DataFlow::SourceNode callee |
+      this = callee.getACall() |
+      (moduleName = "http" or moduleName = "https") and
+      callee = DataFlow::moduleMember(moduleName, httpMethodName()) and
+      url = getArgument(0)
+    )
+  }
+
+  override DataFlow::Node getUrl() {
+    result = url
+  }
+
+}