SERVER-20375 Constrain JS method thisv

This constrains universal access to wraptype methods by providing a
JS_ATTACH_JS_CONSTRAINED_METHOD() macro which allows for a list of types
that are allowed to call said method.

In this way we can lock down all methods without having to add uasserts
to each individual method body.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mongo/scripting/mozjs/valuewriter.h b/src/mongo/scripting/mozjs/valuewriter.h
index dd0eb98af92..1945303867b 100644
--- a/src/mongo/scripting/mozjs/valuewriter.h
+++ b/src/mongo/scripting/mozjs/valuewriter.h
@@ -63,6 +63,11 @@ public:
     bool toBoolean();
 
     /**
+     * Provides the type of the value. For objects, it fetches the class name if possible.
+     */
+    std::string typeAsString();
+
+    /**
      * Writes the value into a bsonobjbuilder under the name in sd.
      */
     void writeThis(BSONObjBuilder* b, StringData sd);