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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_BASE_INSTANCE_IDENTITY_TOKEN_GETTER_H_
#define REMOTING_BASE_INSTANCE_IDENTITY_TOKEN_GETTER_H_
#include <string>
#include <string_view>
#include <vector>
#include "base/functional/callback_forward.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/time/time.h"
#include "remoting/base/compute_engine_service_client.h"
#include "remoting/base/http_status.h"
namespace network {
class SharedURLLoaderFactory;
} // namespace network
namespace remoting {
// InstanceIdentityTokenGetter caches instance identity tokens for Compute
// Engine service requests and refreshes them as needed.
class InstanceIdentityTokenGetter {
public:
using TokenCallback = base::OnceCallback<void(std::string_view)>;
InstanceIdentityTokenGetter(
std::string_view audience,
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory);
InstanceIdentityTokenGetter(const InstanceIdentityTokenGetter&) = delete;
InstanceIdentityTokenGetter& operator=(const InstanceIdentityTokenGetter&) =
delete;
~InstanceIdentityTokenGetter();
// Calls |on_token| with an identity token, or empty in the case the request
// fails. The token returned has a lifetime of at least 10 minutes and should
// not be cached.
void RetrieveToken(TokenCallback on_token);
private:
void OnTokenRetrieved(const HttpStatus& response);
// An identifier which is embedded in the identity token. Typically this will
// be the URL of the API which the token used to access but could be an
// arbitrary identifier or string.
const std::string audience_;
// The instance identity token from the last successful fetch operation.
std::string identity_token_ GUARDED_BY_CONTEXT(sequence_checker_);
// The point at which the token should be refreshed.
base::Time token_expiration_time_ GUARDED_BY_CONTEXT(sequence_checker_);
// The set of callbacks to run after fetching an updated identity token.
std::vector<TokenCallback> queued_callbacks_
GUARDED_BY_CONTEXT(sequence_checker_);
// Used to request an instance identity token.
ComputeEngineServiceClient compute_engine_service_client_
GUARDED_BY_CONTEXT(sequence_checker_);
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<InstanceIdentityTokenGetter> weak_ptr_factory_{this};
};
} // namespace remoting
#endif // REMOTING_BASE_INSTANCE_IDENTITY_TOKEN_GETTER_H_
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