text: // 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 "extensions/renderer/blob_native_handler.h"
  
  #include "base/bind.h"
  #include "third_party/WebKit/public/platform/WebCString.h"
  #include "third_party/WebKit/public/platform/WebURL.h"
  #include "third_party/WebKit/public/web/WebBlob.h"
  
  namespace {
  
  // Expects a single Blob argument. Returns the Blob's UUID.
  void GetBlobUuid(const v8::FunctionCallbackInfo<v8::Value>& args) {
    DCHECK_EQ(1, args.Length());
    blink::WebBlob blob = blink::WebBlob::fromV8Value(args[0]);
    args.GetReturnValue().Set(
        v8::String::NewFromUtf8(args.GetIsolate(), blob.uuid().utf8().data()));
  }
  
  // Take ownership of a Blob created on the browser process. Expects the Blob's
  // UUID, type, and size as arguments. Returns the Blob we just took to
  // Javascript. The Blob reference in the browser process is dropped through
  // a separate flow to avoid leaking Blobs if the script context is destroyed.
  void TakeBrowserProcessBlob(const v8::FunctionCallbackInfo<v8::Value>& args) {
    DCHECK_EQ(3, args.Length());
    DCHECK(args[0]->IsString());
    DCHECK(args[1]->IsString());
    DCHECK(args[2]->IsInt32());
    std::string uuid(*v8::String::Utf8Value(args[0]->ToString()));
    std::string type(*v8::String::Utf8Value(args[1]->ToString()));
    blink::WebBlob blob =
        blink::WebBlob::createFromUUID(blink::WebString::fromUTF8(uuid),
                                       blink::WebString::fromUTF8(type),
                                       args[2]->Int32Value());
    args.GetReturnValue().Set(blob.toV8Value(args.Holder(), args.GetIsolate()));
  }
  
  }  // namespace
  
  namespace extensions {
  
  BlobNativeHandler::BlobNativeHandler(ScriptContext* context)
      : ObjectBackedNativeHandler(context) {
    RouteFunction("GetBlobUuid", base::Bind(&GetBlobUuid));
    RouteFunction("TakeBrowserProcessBlob", base::Bind(&TakeBrowserProcessBlob));
  }
  
  }  // namespace extensions
  