Revert "Remove window.postMessage(message, transferables, targetOrigin) legacy overload"

third_party/WebKit/Source/bindings/core/v8/custom/V8WindowCustom.cpp

 /*
  * Copyright (C) 2009, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 135 matching lines @@
     // Delete the accessor from the inner object.
     info.Holder()->Delete(isolate->GetCurrentContext(), v8AtomicString(isolate, "opener"));
 
     // Put property on the inner object.
     if (info.Holder()->IsObject()) {
         v8::Maybe<bool> unused = v8::Local<v8::Object>::Cast(info.Holder())->Set(isolate->GetCurrentContext(), v8AtomicString(isolate, "opener"), value);
         ALLOW_UNUSED_LOCAL(unused);
     }
 }
 
+static bool isLegacyTargetOriginDesignation(v8::Local<v8::Value> value)
+{
+    if (value->IsString() || value->IsStringObject())
+        return true;
+    return false;
+}
+
+
 void V8Window::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "postMessage", "Window", info.Holder(), info.GetIsolate());
     if (UNLIKELY(info.Length() < 2)) {
         setMinimumArityTypeError(exceptionState, 2, info.Length());
         exceptionState.throwIfNeeded();
         return;
     }
 
     // None of these need to be RefPtr because info and context are guaranteed
     // to hold on to them.
     DOMWindow* window = V8Window::toImpl(info.Holder());
     // TODO(yukishiino): The HTML spec specifies that we should use the
     // Incumbent Realm instead of the Current Realm, but currently we don't have
     // a way to retrieve the Incumbent Realm.  See also:
     // https://html.spec.whatwg.org/multipage/comms.html#dom-window-postmessage
     LocalDOMWindow* source = currentDOMWindow(info.GetIsolate());
 
     ASSERT(window);
     UseCounter::countIfNotPrivateScript(info.GetIsolate(), window->frame(), UseCounter::WindowPostMessage);
 
     // If called directly by WebCore we don't have a calling context.
     if (!source) {
         exceptionState.throwTypeError("No active calling context exists.");
         exceptionState.throwIfNeeded();
         return;
     }
 
     // This function has variable arguments and can be:
+    // Per current spec:
     //   postMessage(message, targetOrigin)
     //   postMessage(message, targetOrigin, {sequence of transferrables})
-    // TODO(foolip): Type checking of the arguments should happen in order, so
-    // that e.g. postMessage({}, { toString: () => { throw Error(); } }, 0)
-    // throws the Error from toString, not the TypeError for argument 3.
+    // Legacy non-standard implementations in webkit allowed:
+    //   postMessage(message, {sequence of transferrables}, targetOrigin);
     Transferables transferables;
-    const int targetOriginArgIndex = 1;
+    int targetOriginArgIndex = 1;
     if (info.Length() > 2) {
-        const int transferablesArgIndex = 2;
+        int transferablesArgIndex = 2;
+        if (isLegacyTargetOriginDesignation(info[2])) {
+            Deprecation::countDeprecationIfNotPrivateScript(info.GetIsolate(), window->document(), UseCounter::WindowPostMessageWithLegacyTargetOriginArgument);
+            targetOriginArgIndex = 2;
+            transferablesArgIndex = 1;
+        }
         if (!SerializedScriptValue::extractTransferables(info.GetIsolate(), info[transferablesArgIndex], transferablesArgIndex, transferables, exceptionState)) {
             exceptionState.throwIfNeeded();
             return;
         }
     }
-    // TODO(foolip): targetOrigin should be a USVString in IDL and treated as
-    // such here, without TreatNullAndUndefinedAsNullString.
     TOSTRING_VOID(V8StringResource<TreatNullAndUndefinedAsNullString>, targetOrigin, info[targetOriginArgIndex]);
 
     RefPtr<SerializedScriptValue> message = SerializedScriptValue::serialize(info.GetIsolate(), info[0], &transferables, nullptr, exceptionState);
     if (exceptionState.throwIfNeeded())
         return;
 
     window->postMessage(message.release(), transferables.messagePorts, targetOrigin, source, exceptionState);
     exceptionState.throwIfNeeded();
 }
 
@@ skipping 80 matching lines @@
         if (items->hasExactlyOneItem()) {
             v8SetReturnValueFast(info, items->item(0), window);
             return;
         }
         v8SetReturnValueFast(info, items, window);
         return;
     }
 }
 
 } // namespace blink