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// Copyright (c) 2012 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 GOOGLE_APIS_GAIA_OAUTH2_API_CALL_FLOW_H_
#define GOOGLE_APIS_GAIA_OAUTH2_API_CALL_FLOW_H_
#include <string>
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "url/gurl.h"
class GoogleServiceAuthError;
class OAuth2MintTokenFlowTest;
namespace net {
class URLFetcher;
class URLRequestContextGetter;
}
// Base class for all classes that implement a flow to call OAuth2 enabled APIs,
// given an access token to the service. This class abstracts the basic steps
// and exposes template methods for sub-classes to implement for API specific
// details.
class OAuth2ApiCallFlow : public net::URLFetcherDelegate {
public:
OAuth2ApiCallFlow();
~OAuth2ApiCallFlow() override;
// Start the flow.
virtual void Start(net::URLRequestContextGetter* context,
const std::string& access_token);
// net::URLFetcherDelegate implementation.
void OnURLFetchComplete(const net::URLFetcher* source) override;
protected:
// Template methods for sub-classes.
// Methods to help create the API request.
virtual GURL CreateApiCallUrl() = 0;
virtual std::string CreateApiCallBody() = 0;
virtual std::string CreateApiCallBodyContentType();
// Sub-classes can expose an appropriate observer interface by implementing
// these template methods.
// Called when the API call finished successfully.
virtual void ProcessApiCallSuccess(const net::URLFetcher* source) = 0;
// Called when the API call failed.
virtual void ProcessApiCallFailure(const net::URLFetcher* source) = 0;
private:
enum State {
INITIAL,
API_CALL_STARTED,
API_CALL_DONE,
ERROR_STATE
};
// Creates an instance of URLFetcher that does not send or save cookies.
// Template method CreateApiCallUrl is used to get the URL.
// Template method CreateApiCallBody is used to get the body.
// The URLFether's method will be GET if body is empty, POST otherwise.
scoped_ptr<net::URLFetcher> CreateURLFetcher(
net::URLRequestContextGetter* context,
const std::string& access_token);
// Helper methods to implement the state machine for the flow.
void BeginApiCall();
void EndApiCall(const net::URLFetcher* source);
State state_;
scoped_ptr<net::URLFetcher> url_fetcher_;
DISALLOW_COPY_AND_ASSIGN(OAuth2ApiCallFlow);
};
#endif // GOOGLE_APIS_GAIA_OAUTH2_API_CALL_FLOW_H_
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