[webcrypto] Replace KeyAlgorithm interfaces with an Object.

Source/bindings/v8/custom/V8CryptoKeyCustom.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "bindings/modules/v8/V8CryptoKey.h"
+
+#include "bindings/v8/V8Binding.h"
+#include "bindings/v8/custom/V8Uint8ArrayCustom.h"
+#include "public/platform/WebCryptoKeyAlgorithm.h"
+#include "wtf/Uint8Array.h"
+
+namespace WebCore {
+
+class DictionaryBuilder : public blink::WebCryptoKeyAlgorithmDictionary {

[abarth-chromium, 2014/06/26 19:56:17]

Can we move this class into the bindings directory?  It seems like there's a
general class intertwined with some webcrypto specific stuff.

+public:
+    DictionaryBuilder(v8::Handle<v8::Object> holder, v8::Isolate* isolate)
+        : m_holder(holder)
+        , m_isolate(isolate)
+        , m_object(v8::Object::New(isolate))
+    {
+    }
+
+    virtual void setString(const char* propertyName, const char* value)
+    {
+        m_object->Set(createString(propertyName), createString(value));
+    }
+
+    virtual void setUint(const char* propertyName, unsigned value)
+    {
+        m_object->Set(createString(propertyName), v8::Integer::NewFromUnsigned(m_isolate, value));
+    }
+
+    virtual void setAlgorithm(const char* propertyName, const blink::WebCryptoAlgorithm& algorithm)
+    {
+        ASSERT(algorithm.paramsType() == blink::WebCryptoAlgorithmParamsTypeNone);
+
+        DictionaryBuilder builder(m_holder, m_isolate);
+        builder.setString("name", blink::WebCryptoAlgorithm::lookupAlgorithmInfo(algorithm.id())->name);
+        m_object->Set(createString(propertyName), builder.v8Object());
+    }
+
+    virtual void setUint8Array(const char* propertyName, const blink::WebVector<unsigned char>& vector)
+    {
+        RefPtr<Uint8Array> uint8Array = Uint8Array::create(vector.data(), vector.size());
+        m_object->Set(createString(propertyName), toV8(uint8Array.get(), m_holder, m_isolate));
+    }
+
+    v8::Handle<v8::Object> v8Object() const
+    {
+        return m_object;
+    }
+
+private:
+    v8::Local<v8::String> createString(const char* utf8CString)
+    {
+        return v8::String::NewFromUtf8(m_isolate, utf8CString);
+    }
+
+    v8::Handle<v8::Object> m_holder;
+    v8::Isolate* m_isolate;
+    v8::Handle<v8::Object> m_object;
+};
+
+void V8CryptoKey::algorithmAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    CryptoKey* impl = V8CryptoKey::toNative(info.Holder());
+
+    DictionaryBuilder builder(info.Holder(), info.GetIsolate());
+    impl->key().algorithm().writeToDictionary(&builder);
+
+    v8SetReturnValue(info, builder.v8Object());
+}
+
+} // namespace WebCore