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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/memory/scoped_ptr.h"
#include "google_apis/gaia/oauth2_access_token_consumer.h"
#include "google_apis/gaia/oauth2_access_token_fetcher.h"
#include "net/url_request/url_fetcher_delegate.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 a refresh token, an access token, and a list of scopes an OAuth2
// enabled API is called in the following way:
// 1. Try the given access token to call the API.
// 2. If that does not work, use the refresh token and scopes to generate
// a new access token.
// 3. Try the new access token to call the API.
//
// 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 OAuth2AccessTokenConsumer {
public:
// Creates an instance that works with the given data.
// Note that |access_token| can be empty. In that case, the flow will skip
// the first step (of trying an existing access token).
OAuth2ApiCallFlow(
net::URLRequestContextGetter* context,
const std::string& refresh_token,
const std::string& access_token,
const std::vector<std::string>& scopes);
virtual ~OAuth2ApiCallFlow();
// Start the flow.
virtual void Start();
// OAuth2AccessTokenFetcher implementation.
virtual void OnGetTokenSuccess(const std::string& access_token,
const base::Time& expiration_time) OVERRIDE;
virtual void OnGetTokenFailure(const GoogleServiceAuthError& error) OVERRIDE;
// net::URLFetcherDelegate implementation.
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
protected:
// Template methods for sub-classes.
// Methods to help create HTTP request.
virtual GURL CreateApiCallUrl() = 0;
virtual std::string CreateApiCallBody() = 0;
// 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;
// Called when a new access token is generated.
virtual void ProcessNewAccessToken(const std::string& access_token) = 0;
virtual void ProcessMintAccessTokenFailure(
const GoogleServiceAuthError& error) = 0;
private:
enum State {
INITIAL,
API_CALL_STARTED,
API_CALL_DONE,
MINT_ACCESS_TOKEN_STARTED,
MINT_ACCESS_TOKEN_DONE,
ERROR_STATE
};
friend class OAuth2ApiCallFlowTest;
FRIEND_TEST_ALL_PREFIXES(OAuth2ApiCallFlowTest, CreateURLFetcher);
// Helper to create an instance of access token fetcher.
// Caller owns the returned instance.
// Note that this is virtual since it is mocked during unit testing.
virtual OAuth2AccessTokenFetcher* CreateAccessTokenFetcher();
// 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.
// Caller owns the returned instance.
// Note that this is virtual since it is mocked during unit testing.
virtual net::URLFetcher* CreateURLFetcher();
// Helper methods to implement the state machine for the flow.
void BeginApiCall();
void EndApiCall(const net::URLFetcher* source);
void BeginMintAccessToken();
void EndMintAccessToken(const GoogleServiceAuthError* error);
net::URLRequestContextGetter* context_;
std::string refresh_token_;
std::string access_token_;
std::vector<std::string> scopes_;
State state_;
// Whether we have already tried minting an access token once.
bool tried_mint_access_token_;
scoped_ptr<net::URLFetcher> url_fetcher_;
scoped_ptr<OAuth2AccessTokenFetcher> oauth2_access_token_fetcher_;
DISALLOW_COPY_AND_ASSIGN(OAuth2ApiCallFlow);
};
#endif // GOOGLE_APIS_GAIA_OAUTH2_API_CALL_FLOW_H_
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