extensions/renderer/blob_native_handler.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/renderer/blob_native_handler.h"
   6
   7 #include "base/bind.h"
   8 #include "extensions/renderer/script_context.h"
   9 #include "third_party/WebKit/public/platform/WebCString.h"
  10 #include "third_party/WebKit/public/platform/WebURL.h"
  11 #include "third_party/WebKit/public/web/WebBlob.h"
  12
  13 namespace {
  14
  15 // Expects a single Blob argument. Returns the Blob's UUID.
  16 void GetBlobUuid(const v8::FunctionCallbackInfo<v8::Value>& args) {
  17   DCHECK_EQ(1, args.Length());
  18   blink::WebBlob blob = blink::WebBlob::fromV8Value(args[0]);
  19   args.GetReturnValue().Set(
  20       v8::String::NewFromUtf8(args.GetIsolate(), blob.uuid().utf8().data()));
  21 }
  22
  23 }  // namespace
  24
  25 namespace extensions {
  26
  27 BlobNativeHandler::BlobNativeHandler(ScriptContext* context)
  28     : ObjectBackedNativeHandler(context) {
  29   RouteFunction("GetBlobUuid", base::Bind(&GetBlobUuid));
  30   RouteFunction("TakeBrowserProcessBlob",
  31                 base::Bind(&BlobNativeHandler::TakeBrowserProcessBlob,
  32                            base::Unretained(this)));
  33 }
  34
  35 // Take ownership of a Blob created on the browser process. Expects the Blob's
  36 // UUID, type, and size as arguments. Returns the Blob we just took to
  37 // Javascript. The Blob reference in the browser process is dropped through
  38 // a separate flow to avoid leaking Blobs if the script context is destroyed.
  39 void BlobNativeHandler::TakeBrowserProcessBlob(
  40     const v8::FunctionCallbackInfo<v8::Value>& args) {
  41   DCHECK_EQ(3, args.Length());
  42   DCHECK(args[0]->IsString());
  43   DCHECK(args[1]->IsString());
  44   DCHECK(args[2]->IsInt32());
  45   std::string uuid(*v8::String::Utf8Value(args[0]));
  46   std::string type(*v8::String::Utf8Value(args[1]));
  47   blink::WebBlob blob =
  48       blink::WebBlob::createFromUUID(blink::WebString::fromUTF8(uuid),
  49                                      blink::WebString::fromUTF8(type),
  50                                      args[2]->Int32Value());
  51   args.GetReturnValue().Set(blob.toV8Value(
  52       context()->v8_context()->Global(), args.GetIsolate()));
  53 }
  54
  55 }  // namespace extensions