google_apis/gaia/gaia_oauth_client.cc - chromium/src - Git at Google

 // 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.

 #include "google_apis/gaia/gaia_oauth_client.h"

 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "google_apis/gaia/gaia_urls.h"
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "url/gurl.h"

 namespace {
 const char kAccessTokenValue[] = "access_token";
 const char kRefreshTokenValue[] = "refresh_token";
 const char kExpiresInValue[] = "expires_in";
 }

 namespace gaia {

 // Use a non-zero number, so unit tests can differentiate the URLFetcher used by
 // this class from other fetchers (most other code just hardcodes the ID to 0).
 const int GaiaOAuthClient::kUrlFetcherId = 17109006;

 class GaiaOAuthClient::Core
     : public base::RefCountedThreadSafe<GaiaOAuthClient::Core>,
       public net::URLFetcherDelegate {
  public:
   Core(net::URLRequestContextGetter* request_context_getter)
       : num_retries_(0),
         request_context_getter_(request_context_getter),
         delegate_(NULL),
         request_type_(NO_PENDING_REQUEST) {
   }

   void GetTokensFromAuthCode(const OAuthClientInfo& oauth_client_info,
                              const std::string& auth_code,
                              int max_retries,
                              GaiaOAuthClient::Delegate* delegate);
   void RefreshToken(const OAuthClientInfo& oauth_client_info,
                     const std::string& refresh_token,
                     const std::vector<std::string>& scopes,
                     int max_retries,
                     GaiaOAuthClient::Delegate* delegate);
   void GetUserEmail(const std::string& oauth_access_token,
                     int max_retries,
                     Delegate* delegate);
   void GetUserId(const std::string& oauth_access_token,
                  int max_retries,
                  Delegate* delegate);
   void GetUserInfo(const std::string& oauth_access_token,
                    int max_retries,
                    Delegate* delegate);
   void GetTokenInfo(const std::string& qualifier,
                     const std::string& query,
                     int max_retries,
                     Delegate* delegate);

   // net::URLFetcherDelegate implementation.
   void OnURLFetchComplete(const net::URLFetcher* source) override;

  private:
   friend class base::RefCountedThreadSafe<Core>;

   enum RequestType {
     NO_PENDING_REQUEST,
     TOKENS_FROM_AUTH_CODE,
     REFRESH_TOKEN,
     TOKEN_INFO,
     USER_EMAIL,
     USER_ID,
     USER_INFO,
   };

   ~Core() override {}

   void GetUserInfoImpl(RequestType type,
                        const std::string& oauth_access_token,
                        int max_retries,
                        Delegate* delegate);
   void MakeGaiaRequest(const GURL& url,
                        const std::string& post_body,
                        int max_retries,
                        GaiaOAuthClient::Delegate* delegate);
   void HandleResponse(const net::URLFetcher* source,
                       bool* should_retry_request);

   int num_retries_;
   scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
   GaiaOAuthClient::Delegate* delegate_;
   scoped_ptr<net::URLFetcher> request_;
   RequestType request_type_;
 };

 void GaiaOAuthClient::Core::GetTokensFromAuthCode(
     const OAuthClientInfo& oauth_client_info,
     const std::string& auth_code,
     int max_retries,
     GaiaOAuthClient::Delegate* delegate) {
   DCHECK_EQ(request_type_, NO_PENDING_REQUEST);
   request_type_ = TOKENS_FROM_AUTH_CODE;
   std::string post_body =
       "code=" + net::EscapeUrlEncodedData(auth_code, true) +
       "&client_id=" + net::EscapeUrlEncodedData(oauth_client_info.client_id,
                                                 true) +
       "&client_secret=" +
       net::EscapeUrlEncodedData(oauth_client_info.client_secret, true) +
       "&redirect_uri=" +
       net::EscapeUrlEncodedData(oauth_client_info.redirect_uri, true) +
       "&grant_type=authorization_code";
   MakeGaiaRequest(GURL(GaiaUrls::GetInstance()->oauth2_token_url()),
                   post_body, max_retries, delegate);
 }

 void GaiaOAuthClient::Core::RefreshToken(
     const OAuthClientInfo& oauth_client_info,
     const std::string& refresh_token,
     const std::vector<std::string>& scopes,
     int max_retries,
     GaiaOAuthClient::Delegate* delegate) {
   DCHECK_EQ(request_type_, NO_PENDING_REQUEST);
   request_type_ = REFRESH_TOKEN;
   std::string post_body =
       "refresh_token=" + net::EscapeUrlEncodedData(refresh_token, true) +
       "&client_id=" + net::EscapeUrlEncodedData(oauth_client_info.client_id,
                                                 true) +
       "&client_secret=" +
       net::EscapeUrlEncodedData(oauth_client_info.client_secret, true) +
       "&grant_type=refresh_token";

   if (!scopes.empty()) {
     std::string scopes_string = JoinString(scopes, ' ');
     post_body += "&scope=" + net::EscapeUrlEncodedData(scopes_string, true);
   }

   MakeGaiaRequest(GURL(GaiaUrls::GetInstance()->oauth2_token_url()),
                   post_body, max_retries, delegate);
 }

 void GaiaOAuthClient::Core::GetUserEmail(const std::string& oauth_access_token,
                                          int max_retries,
                                          Delegate* delegate) {
   GetUserInfoImpl(USER_EMAIL, oauth_access_token, max_retries, delegate);
 }

 void GaiaOAuthClient::Core::GetUserId(const std::string& oauth_access_token,
                                       int max_retries,
                                       Delegate* delegate) {
   GetUserInfoImpl(USER_ID, oauth_access_token, max_retries, delegate);
 }

 void GaiaOAuthClient::Core::GetUserInfo(const std::string& oauth_access_token,
                                       int max_retries,
                                       Delegate* delegate) {
   GetUserInfoImpl(USER_INFO, oauth_access_token, max_retries, delegate);
 }

 void GaiaOAuthClient::Core::GetUserInfoImpl(
     RequestType type,
     const std::string& oauth_access_token,
     int max_retries,
     Delegate* delegate) {
   DCHECK_EQ(request_type_, NO_PENDING_REQUEST);
   DCHECK(!request_.get());
   request_type_ = type;
   delegate_ = delegate;
   num_retries_ = 0;
   request_ = net::URLFetcher::Create(
       kUrlFetcherId, GURL(GaiaUrls::GetInstance()->oauth_user_info_url()),
       net::URLFetcher::GET, this);
   request_->SetRequestContext(request_context_getter_.get());
   request_->AddExtraRequestHeader("Authorization: OAuth " + oauth_access_token);
   request_->SetMaxRetriesOn5xx(max_retries);
   request_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                          net::LOAD_DO_NOT_SAVE_COOKIES);

   // Fetchers are sometimes cancelled because a network change was detected,
   // especially at startup and after sign-in on ChromeOS. Retrying once should
   // be enough in those cases; let the fetcher retry up to 3 times just in case.
   // http://crbug.com/163710
   request_->SetAutomaticallyRetryOnNetworkChanges(3);
   request_->Start();
 }

 void GaiaOAuthClient::Core::GetTokenInfo(const std::string& qualifier,
                                          const std::string& query,
                                          int max_retries,
                                          Delegate* delegate) {
   DCHECK_EQ(request_type_, NO_PENDING_REQUEST);
   DCHECK(!request_.get());
   request_type_ = TOKEN_INFO;
   std::string post_body =
       qualifier + "=" + net::EscapeUrlEncodedData(query, true);
   MakeGaiaRequest(GURL(GaiaUrls::GetInstance()->oauth2_token_info_url()),
                   post_body,
                   max_retries,
                   delegate);
 }

 void GaiaOAuthClient::Core::MakeGaiaRequest(
     const GURL& url,
     const std::string& post_body,
     int max_retries,
     GaiaOAuthClient::Delegate* delegate) {
   DCHECK(!request_.get()) << "Tried to fetch two things at once!";
   delegate_ = delegate;
   num_retries_ = 0;
   request_ =
       net::URLFetcher::Create(kUrlFetcherId, url, net::URLFetcher::POST, this);
   request_->SetRequestContext(request_context_getter_.get());
   request_->SetUploadData("application/x-www-form-urlencoded", post_body);
   request_->SetMaxRetriesOn5xx(max_retries);
   request_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                          net::LOAD_DO_NOT_SAVE_COOKIES);
   // See comment on SetAutomaticallyRetryOnNetworkChanges() above.
   request_->SetAutomaticallyRetryOnNetworkChanges(3);
   request_->Start();
 }

 // URLFetcher::Delegate implementation.
 void GaiaOAuthClient::Core::OnURLFetchComplete(
     const net::URLFetcher* source) {
   bool should_retry = false;
   HandleResponse(source, &should_retry);
   if (should_retry) {
     // Explicitly call ReceivedContentWasMalformed() to ensure the current
     // request gets counted as a failure for calculation of the back-off
     // period.  If it was already a failure by status code, this call will
     // be ignored.
     request_->ReceivedContentWasMalformed();
     num_retries_++;
     // We must set our request_context_getter_ again because
     // URLFetcher::Core::RetryOrCompleteUrlFetch resets it to NULL...
     request_->SetRequestContext(request_context_getter_.get());
     request_->Start();
   }
 }

 void GaiaOAuthClient::Core::HandleResponse(
     const net::URLFetcher* source,
     bool* should_retry_request) {
   // Move ownership of the request fetcher into a local scoped_ptr which
   // will be nuked when we're done handling the request, unless we need
   // to retry, in which case ownership will be returned to request_.
   scoped_ptr<net::URLFetcher> old_request = request_.Pass();
   DCHECK_EQ(source, old_request.get());

   // HTTP_BAD_REQUEST means the arguments are invalid.  HTTP_UNAUTHORIZED means
   // the access or refresh token is invalid. No point retrying. We are
   // done here.
   int response_code = source->GetResponseCode();
   if (response_code == net::HTTP_BAD_REQUEST ||
       response_code == net::HTTP_UNAUTHORIZED) {
     delegate_->OnOAuthError();
     return;
   }

   scoped_ptr<base::DictionaryValue> response_dict;
   if (source->GetResponseCode() == net::HTTP_OK) {
     std::string data;
     source->GetResponseAsString(&data);
     scoped_ptr<base::Value> message_value = base::JSONReader::Read(data);
     if (message_value.get() &&
         message_value->IsType(base::Value::TYPE_DICTIONARY)) {
       response_dict.reset(
           static_cast<base::DictionaryValue*>(message_value.release()));
     }
   }

   if (!response_dict.get()) {
     // If we don't have an access token yet and the the error was not
     // RC_BAD_REQUEST, we may need to retry.
     if ((source->GetMaxRetriesOn5xx() != -1) &&
         (num_retries_ >= source->GetMaxRetriesOn5xx())) {
       // Retry limit reached. Give up.
       delegate_->OnNetworkError(source->GetResponseCode());
     } else {
       request_ = old_request.Pass();
       *should_retry_request = true;
     }
     return;
   }

   RequestType type = request_type_;
   request_type_ = NO_PENDING_REQUEST;

   switch (type) {
     case USER_EMAIL: {
       std::string email;
       response_dict->GetString("email", &email);
       delegate_->OnGetUserEmailResponse(email);
       break;
     }

     case USER_ID: {
       std::string id;
       response_dict->GetString("id", &id);
       delegate_->OnGetUserIdResponse(id);
       break;
     }

     case USER_INFO: {
       delegate_->OnGetUserInfoResponse(response_dict.Pass());
       break;
     }

     case TOKEN_INFO: {
       delegate_->OnGetTokenInfoResponse(response_dict.Pass());
       break;
     }

     case TOKENS_FROM_AUTH_CODE:
     case REFRESH_TOKEN: {
       std::string access_token;
       std::string refresh_token;
       int expires_in_seconds = 0;
       response_dict->GetString(kAccessTokenValue, &access_token);
       response_dict->GetString(kRefreshTokenValue, &refresh_token);
       response_dict->GetInteger(kExpiresInValue, &expires_in_seconds);

       if (access_token.empty()) {
         delegate_->OnOAuthError();
         return;
       }

       if (type == REFRESH_TOKEN) {
         delegate_->OnRefreshTokenResponse(access_token, expires_in_seconds);
       } else {
         delegate_->OnGetTokensResponse(refresh_token,
                                        access_token,
                                        expires_in_seconds);
       }
       break;
     }

     default:
       NOTREACHED();
   }
 }

 GaiaOAuthClient::GaiaOAuthClient(net::URLRequestContextGetter* context_getter) {
   core_ = new Core(context_getter);
 }

 GaiaOAuthClient::~GaiaOAuthClient() {
 }

 void GaiaOAuthClient::GetTokensFromAuthCode(
     const OAuthClientInfo& oauth_client_info,
     const std::string& auth_code,
     int max_retries,
     Delegate* delegate) {
   return core_->GetTokensFromAuthCode(oauth_client_info,
                                       auth_code,
                                       max_retries,
                                       delegate);
 }

 void GaiaOAuthClient::RefreshToken(
     const OAuthClientInfo& oauth_client_info,
     const std::string& refresh_token,
     const std::vector<std::string>& scopes,
     int max_retries,
     Delegate* delegate) {
   return core_->RefreshToken(oauth_client_info,
                              refresh_token,
                              scopes,
                              max_retries,
                              delegate);
 }

 void GaiaOAuthClient::GetUserEmail(const std::string& access_token,
                                   int max_retries,
                                   Delegate* delegate) {
   return core_->GetUserEmail(access_token, max_retries, delegate);
 }

 void GaiaOAuthClient::GetUserId(const std::string& access_token,
                                 int max_retries,
                                 Delegate* delegate) {
   return core_->GetUserId(access_token, max_retries, delegate);
 }

 void GaiaOAuthClient::GetUserInfo(const std::string& access_token,
                                   int max_retries,
                                   Delegate* delegate) {
   return core_->GetUserInfo(access_token, max_retries, delegate);
 }

 void GaiaOAuthClient::GetTokenInfo(const std::string& access_token,
                                    int max_retries,
                                    Delegate* delegate) {
   return core_->GetTokenInfo("access_token", access_token, max_retries,
                              delegate);
 }

 void GaiaOAuthClient::GetTokenHandleInfo(const std::string& token_handle,
                                          int max_retries,
                                          Delegate* delegate) {
   return core_->GetTokenInfo("token_handle", token_handle, max_retries,
                              delegate);
 }

 }  // namespace gaia
	// 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.

	#include "google_apis/gaia/gaia_oauth_client.h"

	#include "base/json/json_reader.h"
	#include "base/logging.h"
	#include "base/memory/scoped_ptr.h"
	#include "base/strings/string_util.h"
	#include "base/values.h"
	#include "google_apis/gaia/gaia_urls.h"
	#include "net/base/escape.h"
	#include "net/base/load_flags.h"
	#include "net/http/http_status_code.h"
	#include "net/url_request/url_fetcher.h"
	#include "net/url_request/url_fetcher_delegate.h"
	#include "net/url_request/url_request_context_getter.h"
	#include "url/gurl.h"

	namespace {
	const char kAccessTokenValue[] = "access_token";
	const char kRefreshTokenValue[] = "refresh_token";
	const char kExpiresInValue[] = "expires_in";
	}

	namespace gaia {

	// Use a non-zero number, so unit tests can differentiate the URLFetcher used by
	// this class from other fetchers (most other code just hardcodes the ID to 0).
	const int GaiaOAuthClient::kUrlFetcherId = 17109006;

	class GaiaOAuthClient::Core
	: public base::RefCountedThreadSafe<GaiaOAuthClient::Core>,
	public net::URLFetcherDelegate {
	public:
	Core(net::URLRequestContextGetter* request_context_getter)
	: num_retries_(0),
	request_context_getter_(request_context_getter),
	delegate_(NULL),
	request_type_(NO_PENDING_REQUEST) {
	}

	void GetTokensFromAuthCode(const OAuthClientInfo& oauth_client_info,
	const std::string& auth_code,
	int max_retries,
	GaiaOAuthClient::Delegate* delegate);
	void RefreshToken(const OAuthClientInfo& oauth_client_info,
	const std::string& refresh_token,
	const std::vector<std::string>& scopes,
	int max_retries,
	GaiaOAuthClient::Delegate* delegate);
	void GetUserEmail(const std::string& oauth_access_token,
	int max_retries,
	Delegate* delegate);
	void GetUserId(const std::string& oauth_access_token,
	int max_retries,
	Delegate* delegate);
	void GetUserInfo(const std::string& oauth_access_token,
	int max_retries,
	Delegate* delegate);
	void GetTokenInfo(const std::string& qualifier,
	const std::string& query,
	int max_retries,
	Delegate* delegate);

	// net::URLFetcherDelegate implementation.
	void OnURLFetchComplete(const net::URLFetcher* source) override;

	private:
	friend class base::RefCountedThreadSafe<Core>;

	enum RequestType {
	NO_PENDING_REQUEST,
	TOKENS_FROM_AUTH_CODE,
	REFRESH_TOKEN,
	TOKEN_INFO,
	USER_EMAIL,
	USER_ID,
	USER_INFO,
	};

	~Core() override {}

	void GetUserInfoImpl(RequestType type,
	const std::string& oauth_access_token,
	int max_retries,
	Delegate* delegate);
	void MakeGaiaRequest(const GURL& url,
	const std::string& post_body,
	int max_retries,
	GaiaOAuthClient::Delegate* delegate);
	void HandleResponse(const net::URLFetcher* source,
	bool* should_retry_request);

	int num_retries_;
	scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
	GaiaOAuthClient::Delegate* delegate_;
	scoped_ptr<net::URLFetcher> request_;
	RequestType request_type_;
	};

	void GaiaOAuthClient::Core::GetTokensFromAuthCode(
	const OAuthClientInfo& oauth_client_info,
	const std::string& auth_code,
	int max_retries,
	GaiaOAuthClient::Delegate* delegate) {
	DCHECK_EQ(request_type_, NO_PENDING_REQUEST);
	request_type_ = TOKENS_FROM_AUTH_CODE;
	std::string post_body =
	"code=" + net::EscapeUrlEncodedData(auth_code, true) +
	"&client_id=" + net::EscapeUrlEncodedData(oauth_client_info.client_id,
	true) +
	"&client_secret=" +
	net::EscapeUrlEncodedData(oauth_client_info.client_secret, true) +
	"&redirect_uri=" +
	net::EscapeUrlEncodedData(oauth_client_info.redirect_uri, true) +
	"&grant_type=authorization_code";
	MakeGaiaRequest(GURL(GaiaUrls::GetInstance()->oauth2_token_url()),
	post_body, max_retries, delegate);
	}

	void GaiaOAuthClient::Core::RefreshToken(
	const OAuthClientInfo& oauth_client_info,
	const std::string& refresh_token,
	const std::vector<std::string>& scopes,
	int max_retries,
	GaiaOAuthClient::Delegate* delegate) {
	DCHECK_EQ(request_type_, NO_PENDING_REQUEST);
	request_type_ = REFRESH_TOKEN;
	std::string post_body =
	"refresh_token=" + net::EscapeUrlEncodedData(refresh_token, true) +
	"&client_id=" + net::EscapeUrlEncodedData(oauth_client_info.client_id,
	true) +
	"&client_secret=" +
	net::EscapeUrlEncodedData(oauth_client_info.client_secret, true) +
	"&grant_type=refresh_token";

	if (!scopes.empty()) {
	std::string scopes_string = JoinString(scopes, ' ');
	post_body += "&scope=" + net::EscapeUrlEncodedData(scopes_string, true);
	}

	MakeGaiaRequest(GURL(GaiaUrls::GetInstance()->oauth2_token_url()),
	post_body, max_retries, delegate);
	}

	void GaiaOAuthClient::Core::GetUserEmail(const std::string& oauth_access_token,
	int max_retries,
	Delegate* delegate) {
	GetUserInfoImpl(USER_EMAIL, oauth_access_token, max_retries, delegate);
	}

	void GaiaOAuthClient::Core::GetUserId(const std::string& oauth_access_token,
	int max_retries,
	Delegate* delegate) {
	GetUserInfoImpl(USER_ID, oauth_access_token, max_retries, delegate);
	}

	void GaiaOAuthClient::Core::GetUserInfo(const std::string& oauth_access_token,
	int max_retries,
	Delegate* delegate) {
	GetUserInfoImpl(USER_INFO, oauth_access_token, max_retries, delegate);
	}

	void GaiaOAuthClient::Core::GetUserInfoImpl(
	RequestType type,
	const std::string& oauth_access_token,
	int max_retries,
	Delegate* delegate) {
	DCHECK_EQ(request_type_, NO_PENDING_REQUEST);
	DCHECK(!request_.get());
	request_type_ = type;
	delegate_ = delegate;
	num_retries_ = 0;
	request_ = net::URLFetcher::Create(
	kUrlFetcherId, GURL(GaiaUrls::GetInstance()->oauth_user_info_url()),
	net::URLFetcher::GET, this);
	request_->SetRequestContext(request_context_getter_.get());
	request_->AddExtraRequestHeader("Authorization: OAuth " + oauth_access_token);
	request_->SetMaxRetriesOn5xx(max_retries);
	request_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES \|
	net::LOAD_DO_NOT_SAVE_COOKIES);

	// Fetchers are sometimes cancelled because a network change was detected,
	// especially at startup and after sign-in on ChromeOS. Retrying once should
	// be enough in those cases; let the fetcher retry up to 3 times just in case.
	// http://crbug.com/163710
	request_->SetAutomaticallyRetryOnNetworkChanges(3);
	request_->Start();
	}

	void GaiaOAuthClient::Core::GetTokenInfo(const std::string& qualifier,
	const std::string& query,
	int max_retries,
	Delegate* delegate) {
	DCHECK_EQ(request_type_, NO_PENDING_REQUEST);
	DCHECK(!request_.get());
	request_type_ = TOKEN_INFO;
	std::string post_body =
	qualifier + "=" + net::EscapeUrlEncodedData(query, true);
	MakeGaiaRequest(GURL(GaiaUrls::GetInstance()->oauth2_token_info_url()),
	post_body,
	max_retries,
	delegate);
	}

	void GaiaOAuthClient::Core::MakeGaiaRequest(
	const GURL& url,
	const std::string& post_body,
	int max_retries,
	GaiaOAuthClient::Delegate* delegate) {
	DCHECK(!request_.get()) << "Tried to fetch two things at once!";
	delegate_ = delegate;
	num_retries_ = 0;
	request_ =
	net::URLFetcher::Create(kUrlFetcherId, url, net::URLFetcher::POST, this);
	request_->SetRequestContext(request_context_getter_.get());
	request_->SetUploadData("application/x-www-form-urlencoded", post_body);
	request_->SetMaxRetriesOn5xx(max_retries);
	request_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES \|
	net::LOAD_DO_NOT_SAVE_COOKIES);
	// See comment on SetAutomaticallyRetryOnNetworkChanges() above.
	request_->SetAutomaticallyRetryOnNetworkChanges(3);
	request_->Start();
	}

	// URLFetcher::Delegate implementation.
	void GaiaOAuthClient::Core::OnURLFetchComplete(
	const net::URLFetcher* source) {
	bool should_retry = false;
	HandleResponse(source, &should_retry);
	if (should_retry) {
	// Explicitly call ReceivedContentWasMalformed() to ensure the current
	// request gets counted as a failure for calculation of the back-off
	// period. If it was already a failure by status code, this call will
	// be ignored.
	request_->ReceivedContentWasMalformed();
	num_retries_++;
	// We must set our request_context_getter_ again because
	// URLFetcher::Core::RetryOrCompleteUrlFetch resets it to NULL...
	request_->SetRequestContext(request_context_getter_.get());
	request_->Start();
	}
	}

	void GaiaOAuthClient::Core::HandleResponse(
	const net::URLFetcher* source,
	bool* should_retry_request) {
	// Move ownership of the request fetcher into a local scoped_ptr which
	// will be nuked when we're done handling the request, unless we need
	// to retry, in which case ownership will be returned to request_.
	scoped_ptr<net::URLFetcher> old_request = request_.Pass();
	DCHECK_EQ(source, old_request.get());

	// HTTP_BAD_REQUEST means the arguments are invalid. HTTP_UNAUTHORIZED means
	// the access or refresh token is invalid. No point retrying. We are
	// done here.
	int response_code = source->GetResponseCode();
	if (response_code == net::HTTP_BAD_REQUEST \|\|
	response_code == net::HTTP_UNAUTHORIZED) {
	delegate_->OnOAuthError();
	return;
	}

	scoped_ptr<base::DictionaryValue> response_dict;
	if (source->GetResponseCode() == net::HTTP_OK) {
	std::string data;
	source->GetResponseAsString(&data);
	scoped_ptr<base::Value> message_value = base::JSONReader::Read(data);
	if (message_value.get() &&
	message_value->IsType(base::Value::TYPE_DICTIONARY)) {
	response_dict.reset(
	static_cast<base::DictionaryValue*>(message_value.release()));
	}
	}

	if (!response_dict.get()) {
	// If we don't have an access token yet and the the error was not
	// RC_BAD_REQUEST, we may need to retry.
	if ((source->GetMaxRetriesOn5xx() != -1) &&
	(num_retries_ >= source->GetMaxRetriesOn5xx())) {
	// Retry limit reached. Give up.
	delegate_->OnNetworkError(source->GetResponseCode());
	} else {
	request_ = old_request.Pass();
	*should_retry_request = true;
	}
	return;
	}

	RequestType type = request_type_;
	request_type_ = NO_PENDING_REQUEST;

	switch (type) {
	case USER_EMAIL: {
	std::string email;
	response_dict->GetString("email", &email);
	delegate_->OnGetUserEmailResponse(email);
	break;
	}

	case USER_ID: {
	std::string id;
	response_dict->GetString("id", &id);
	delegate_->OnGetUserIdResponse(id);
	break;
	}

	case USER_INFO: {
	delegate_->OnGetUserInfoResponse(response_dict.Pass());
	break;
	}

	case TOKEN_INFO: {
	delegate_->OnGetTokenInfoResponse(response_dict.Pass());
	break;
	}

	case TOKENS_FROM_AUTH_CODE:
	case REFRESH_TOKEN: {
	std::string access_token;
	std::string refresh_token;
	int expires_in_seconds = 0;
	response_dict->GetString(kAccessTokenValue, &access_token);
	response_dict->GetString(kRefreshTokenValue, &refresh_token);
	response_dict->GetInteger(kExpiresInValue, &expires_in_seconds);

	if (access_token.empty()) {
	delegate_->OnOAuthError();
	return;
	}

	if (type == REFRESH_TOKEN) {
	delegate_->OnRefreshTokenResponse(access_token, expires_in_seconds);
	} else {
	delegate_->OnGetTokensResponse(refresh_token,
	access_token,
	expires_in_seconds);
	}
	break;
	}

	default:
	NOTREACHED();
	}
	}

	GaiaOAuthClient::GaiaOAuthClient(net::URLRequestContextGetter* context_getter) {
	core_ = new Core(context_getter);
	}

	GaiaOAuthClient::~GaiaOAuthClient() {
	}

	void GaiaOAuthClient::GetTokensFromAuthCode(
	const OAuthClientInfo& oauth_client_info,
	const std::string& auth_code,
	int max_retries,
	Delegate* delegate) {
	return core_->GetTokensFromAuthCode(oauth_client_info,
	auth_code,
	max_retries,
	delegate);
	}

	void GaiaOAuthClient::RefreshToken(
	const OAuthClientInfo& oauth_client_info,
	const std::string& refresh_token,
	const std::vector<std::string>& scopes,
	int max_retries,
	Delegate* delegate) {
	return core_->RefreshToken(oauth_client_info,
	refresh_token,
	scopes,
	max_retries,
	delegate);
	}

	void GaiaOAuthClient::GetUserEmail(const std::string& access_token,
	int max_retries,
	Delegate* delegate) {
	return core_->GetUserEmail(access_token, max_retries, delegate);
	}

	void GaiaOAuthClient::GetUserId(const std::string& access_token,
	int max_retries,
	Delegate* delegate) {
	return core_->GetUserId(access_token, max_retries, delegate);
	}

	void GaiaOAuthClient::GetUserInfo(const std::string& access_token,
	int max_retries,
	Delegate* delegate) {
	return core_->GetUserInfo(access_token, max_retries, delegate);
	}

	void GaiaOAuthClient::GetTokenInfo(const std::string& access_token,
	int max_retries,
	Delegate* delegate) {
	return core_->GetTokenInfo("access_token", access_token, max_retries,
	delegate);
	}

	void GaiaOAuthClient::GetTokenHandleInfo(const std::string& token_handle,
	int max_retries,
	Delegate* delegate) {
	return core_->GetTokenInfo("token_handle", token_handle, max_retries,
	delegate);
	}

	} // namespace gaia