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// Copyright 2017 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 COMPONENTS_DOODLE_DOODLE_FETCHER_IMPL_H_
#define COMPONENTS_DOODLE_DOODLE_FETCHER_IMPL_H_
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/optional.h"
#include "components/doodle/doodle_fetcher.h"
#include "components/doodle/doodle_types.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_request_context_getter.h"
#include "url/gurl.h"
class GoogleURLTracker;
namespace base {
class DictionaryValue;
class Value;
}
namespace doodle {
// This class provides information about any recent doodle.
// It works asynchronously and calls a callback when finished fetching the
// information from the remote enpoint.
class DoodleFetcherImpl : public DoodleFetcher, public net::URLFetcherDelegate {
public:
// Callback for JSON parsing to allow injecting platform-dependent code.
using ParseJSONCallback = base::Callback<void(
const std::string& unsafe_json,
const base::Callback<void(std::unique_ptr<base::Value> json)>& success,
const base::Callback<void(const std::string&)>& error)>;
DoodleFetcherImpl(
scoped_refptr<net::URLRequestContextGetter> download_context,
GoogleURLTracker* google_url_tracker,
const ParseJSONCallback& json_parsing_callback);
~DoodleFetcherImpl() override;
// Fetches a doodle asynchronously. The |callback| is called with a
// DoodleState indicating whether the request succeded in fetching a doodle.
// If a fetch is already running, the callback will be queued and invoked with
// result from the next completed request.
void FetchDoodle(FinishedCallback callback) override;
private:
// net::URLFetcherDelegate implementation.
void OnURLFetchComplete(const net::URLFetcher* source) override;
// ParseJSONCallback Success callback
void OnJsonParsed(std::unique_ptr<base::Value> json);
// ParseJSONCallback Failure callback
void OnJsonParseFailed(const std::string& error_message);
base::Optional<DoodleConfig> ParseDoodle(
const base::DictionaryValue& ddljson) const;
bool ParseImage(const base::DictionaryValue& image_dict,
const std::string& image_name,
DoodleImage* image) const;
void ParseBaseInformation(const base::DictionaryValue& ddljson,
DoodleConfig* config) const;
GURL ParseRelativeUrl(const base::DictionaryValue& dict_value,
const std::string& key) const;
void RespondToAllCallbacks(DoodleState state,
const base::Optional<DoodleConfig>& config);
GURL GetGoogleBaseUrl() const;
// Returns whether a fetch is still in progress. A fetch begins when a
// callback is added and ends when the last callback was called.
bool IsFetchInProgress() const { return !callbacks_.empty(); }
// Parameters set from constructor.
scoped_refptr<net::URLRequestContextGetter> const download_context_;
ParseJSONCallback json_parsing_callback_;
GoogleURLTracker* google_url_tracker_;
std::vector<FinishedCallback> callbacks_;
std::unique_ptr<net::URLFetcher> fetcher_;
base::WeakPtrFactory<DoodleFetcherImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(DoodleFetcherImpl);
};
} // namespace doodle
#endif // COMPONENTS_DOODLE_DOODLE_FETCHER_IMPL_H_
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