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// Copyright 2013 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 CHROME_BROWSER_POLICY_EXTERNAL_DATA_FETCHER_H_
#define CHROME_BROWSER_POLICY_EXTERNAL_DATA_FETCHER_H_
#include <string>
#include "base/callback_forward.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
namespace policy {
class ExternalDataManager;
// A helper that encapsulates the parameters required to retrieve the external
// data for a policy.
class ExternalDataFetcher {
public:
enum Status {
// This policy does not reference any external data.
STATUS_NO_DATA,
// This policy references external data. The data has been requested but is
// not available yet. Once the data is successfully downloaded and verified,
// the PolicyService that this ExternalDataFetcher belongs to will invoke
// OnPolicyUpdated() to inform its observers that the data is available.
STATUS_DATA_PENDING,
// This external data referenced by the policy has been downloaded, verified
// and is included in the callback.
STATUS_DATA_AVAILABLE
};
typedef base::Callback<void(Status, scoped_ptr<std::string>)> FetchCallback;
ExternalDataFetcher(const ExternalDataFetcher& other);
~ExternalDataFetcher();
static bool Equals(const ExternalDataFetcher* first,
const ExternalDataFetcher* second);
void Fetch(const FetchCallback& callback) const;
protected:
friend class PolicyDomainDescriptorTest;
friend class PolicyMapTest;
ExternalDataFetcher(base::WeakPtr<ExternalDataManager> manager,
const std::string& policy);
private:
base::WeakPtr<ExternalDataManager> manager_;
std::string policy_;
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_EXTERNAL_DATA_FETCHER_H_
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