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// Copyright 2019 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MANIFEST_MANIFEST_FETCHER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MANIFEST_MANIFEST_FETCHER_H_
#include <memory>
#include "base/callback.h"
#include "third_party/blink/renderer/core/loader/threadable_loader.h"
#include "third_party/blink/renderer/core/loader/threadable_loader_client.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_fetcher.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_response.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
namespace blink {
class KURL;
class LocalDOMWindow;
class TextResourceDecoder;
// Helper class to download a Web Manifest. When an instance is created, the
// caller need to call Start() and wait for the passed callback to be executed.
// If the fetch fails, the callback will be called with two empty objects.
class ManifestFetcher final : public GarbageCollected<ManifestFetcher>,
public ThreadableLoaderClient {
USING_GARBAGE_COLLECTED_MIXIN(ManifestFetcher);
// This will be called asynchronously after the URL has been fetched,
// successfully or not. If there is a failure, response and data will both be
// empty. |response| and |data| are both valid until the ManifestFetcher
// instance is destroyed.
using Callback =
base::OnceCallback<void(const ResourceResponse&, const String&)>;
public:
explicit ManifestFetcher(const KURL& url);
~ManifestFetcher() override;
void Start(LocalDOMWindow& window,
bool use_credentials,
ResourceFetcher* resource_fetcher,
ManifestFetcher::Callback callback);
void Cancel();
// ThreadableLoaderClient
void DidReceiveResponse(uint64_t, const ResourceResponse&) override;
void DidReceiveData(const char*, unsigned) override;
void DidFinishLoading(uint64_t) override;
void DidFail(const ResourceError&) override;
void DidFailRedirectCheck() override;
void Trace(Visitor* visitor) const override;
private:
KURL url_;
bool completed_;
ManifestFetcher::Callback callback_;
ResourceResponse response_;
std::unique_ptr<TextResourceDecoder> decoder_;
StringBuilder data_;
Member<ThreadableLoader> loader_;
DISALLOW_COPY_AND_ASSIGN(ManifestFetcher);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MANIFEST_MANIFEST_FETCHER_H_
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