Expose a way to make a "same-origin" realm

src/d8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 // Defined when linking against shared lib on Windows.
 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
 #define V8_SHARED
 #endif
 
@@ skipping 530 matching lines @@
   Local<Context> context = Context::New(isolate, NULL, global_template);
   if (context.IsEmpty()) {
     DCHECK(try_catch.HasCaught());
     try_catch.ReThrow();
     return;
   }
   data->realms_[index].Reset(isolate, context);
   args.GetReturnValue().Set(index);
 }
 
+// Realm.makeSameOrigin(i) sets the security token of i to that of the
+// current realm.
+void Shell::RealmMakeSameOrigin(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+  PerIsolateData* data = PerIsolateData::Get(isolate);
+  int index = data->RealmIndexOrThrow(args, 0);
+  if (index == -1) return;
+  if (index == 0 || index == data->realm_current_ ||
+      index == data->realm_switch_) {
+    Throw(args.GetIsolate(), "Invalid realm index");
+    return;
+  }
+
+  data->realms_[index].Get(isolate)->SetSecurityToken(
+      isolate->GetEnteredContext()->GetSecurityToken());
+}
 
 // Realm.dispose(i) disposes the reference to the realm i.
 void Shell::RealmDispose(const v8::FunctionCallbackInfo<v8::Value>& args) {
   Isolate* isolate = args.GetIsolate();
   PerIsolateData* data = PerIsolateData::Get(isolate);
   int index = data->RealmIndexOrThrow(args, 0);
   if (index == -1) return;
   if (index == 0 ||
       index == data->realm_current_ || index == data->realm_switch_) {
     Throw(args.GetIsolate(), "Invalid realm index");
@@ skipping 568 matching lines @@
       FunctionTemplate::New(isolate, RealmOwner));
   realm_template->Set(
       String::NewFromUtf8(isolate, "global", NewStringType::kNormal)
           .ToLocalChecked(),
       FunctionTemplate::New(isolate, RealmGlobal));
   realm_template->Set(
       String::NewFromUtf8(isolate, "create", NewStringType::kNormal)
           .ToLocalChecked(),
       FunctionTemplate::New(isolate, RealmCreate));
   realm_template->Set(
+      String::NewFromUtf8(isolate, "makeSameOrigin", NewStringType::kNormal)
+          .ToLocalChecked(),
+      FunctionTemplate::New(isolate, RealmMakeSameOrigin));
+  realm_template->Set(
       String::NewFromUtf8(isolate, "dispose", NewStringType::kNormal)
           .ToLocalChecked(),
       FunctionTemplate::New(isolate, RealmDispose));
   realm_template->Set(
       String::NewFromUtf8(isolate, "switch", NewStringType::kNormal)
           .ToLocalChecked(),
       FunctionTemplate::New(isolate, RealmSwitch));
   realm_template->Set(
       String::NewFromUtf8(isolate, "eval", NewStringType::kNormal)
           .ToLocalChecked(),
@@ skipping 1377 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif