Define "opaque" FormData objects.

Source/core/html/DOMFormData.cpp

 /*
  * Copyright (C) 2010 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 59 matching lines @@
 
 private:
     const Member<DOMFormData> m_formData;
     size_t m_current;
 };
 
 } // namespace
 
 DOMFormData::DOMFormData(const WTF::TextEncoding& encoding)
     : FormDataList(encoding)
+    , m_opaque(false)
 {
 }
 
 DOMFormData::DOMFormData(HTMLFormElement* form)
     : FormDataList(UTF8Encoding())
+    , m_opaque(false)
 {
     if (!form)
         return;
 
     for (unsigned i = 0; i < form->associatedElements().size(); ++i) {
         FormAssociatedElement* element = form->associatedElements()[i];
         if (!toHTMLElement(element)->isDisabledFormControl())
             element->appendFormData(*this, true);
     }
 }
@@ skipping 18 matching lines @@
                 UseCounter::count(context, UseCounter::FormDataAppendBlobWithFilename);
         }
     } else {
         UseCounter::count(context, UseCounter::FormDataAppendNull);
     }
     appendBlob(name, blob, filename);
 }
 
 void DOMFormData::get(const String& name, FormDataEntryValue& result)
 {
+    if (m_opaque)
+        return;
     Entry entry = getEntry(name);
     if (entry.isString())
         result.setUSVString(entry.string());
     else if (entry.isFile())
         result.setFile(entry.file());
     else
         ASSERT(entry.isNone());
 }
 
 HeapVector<FormDataEntryValue> DOMFormData::getAll(const String& name)
 {
     HeapVector<FormDataEntryValue> results;
+
+    if (m_opaque)
+        return results;
+
     HeapVector<FormDataList::Entry> entries = FormDataList::getAll(name);
     for (const FormDataList::Entry& entry : entries) {
         ASSERT(entry.name() == name);
         FormDataEntryValue value;
         if (entry.isString())
             value.setUSVString(entry.string());
         else if (entry.isFile())
             value.setFile(entry.file());
         else
             ASSERT_NOT_REACHED();
         results.append(value);
     }
     ASSERT(results.size() == entries.size());
     return results;
 }
 
+bool DOMFormData::has(const String& name)
+{
+    if (m_opaque)
+        return false;
+    return hasEntry(name);
+}
+
 void DOMFormData::set(const String& name, const String& value)
 {
     setData(name, value);
 }
 
 void DOMFormData::set(const String& name, Blob* blob, const String& filename)
 {
     setBlob(name, blob, filename);
 }
 
 PairIterable<String, FormDataEntryValue>::IterationSource* DOMFormData::startIteration(ScriptState*, ExceptionState&)
 {
+    if (m_opaque)
+        return new DOMFormDataIterationSource(new DOMFormData(nullptr));
+
     return new DOMFormDataIterationSource(this);
 }
 
 } // namespace blink