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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CHROME_BROWSER_INTERESTS_INTERESTS_FETCHER_H_ |
| 6 #define CHROME_BROWSER_INTERESTS_INTERESTS_FETCHER_H_ |
| 7 |
| 8 #include <string> |
| 9 #include <vector> |
| 10 |
| 11 #include "base/callback.h" |
| 12 #include "base/gtest_prod_util.h" |
| 13 #include "base/macros.h" |
| 14 #include "base/memory/scoped_ptr.h" |
| 15 #include "chrome/browser/profiles/profile.h" |
| 16 #include "components/signin/core/browser/signin_manager.h" |
| 17 #include "google_apis/gaia/oauth2_token_service.h" |
| 18 #include "net/url_request/url_fetcher.h" |
| 19 #include "net/url_request/url_fetcher_delegate.h" |
| 20 |
| 21 // Class to fetch topics of interest for a user as computed by Google Now. Each |
| 22 // interest is a tuple of a name, a thumbnail URL and a relevance score. This |
| 23 // class is one-shot. To retrieve interests multiple times use multiple |
| 24 // instances of this class. |
| 25 // |
| 26 // Authentication is done via OAuth2 and requires the |
| 27 // https://www.googleapis.com/auth/googlenow scope. |
| 28 // |
| 29 // If the InterestsFetcher is deleted before the callback is called then the |
| 30 // request will be aborted. It is up to the user to ensure that both the |
| 31 // Profile and the OAuth2TokenService outlive the InterestsFetcher. |
| 32 // |
| 33 // The server required for this feature is not publicly available yet. |
| 34 class InterestsFetcher : public net::URLFetcherDelegate, |
| 35 public OAuth2TokenService::Consumer { |
| 36 public: |
| 37 struct Interest { |
| 38 Interest(const std::string& name, const GURL& image_url, double relevance); |
| 39 ~Interest(); |
| 40 |
| 41 bool operator==(const Interest& interest) const; |
| 42 |
| 43 std::string name; |
| 44 GURL image_url; |
| 45 double relevance; |
| 46 }; |
| 47 |
| 48 using InterestsCallback = base::Callback<void(const std::vector<Interest>&)>; |
| 49 |
| 50 InterestsFetcher(OAuth2TokenService* oauth2_token_service, |
| 51 const std::string& account_id, |
| 52 net::URLRequestContextGetter* context); |
| 53 |
| 54 ~InterestsFetcher() override; |
| 55 |
| 56 static scoped_ptr<InterestsFetcher> CreateFromProfile(Profile* profile); |
| 57 |
| 58 void FetchInterests(const InterestsCallback& callback); |
| 59 |
| 60 private: |
| 61 // net::URLFetcherDelegate implementation. |
| 62 void OnURLFetchComplete(const net::URLFetcher* source) override; |
| 63 |
| 64 // OAuth2TokenService::Consumer implementation. |
| 65 void OnGetTokenSuccess(const OAuth2TokenService::Request* request, |
| 66 const std::string& access_token, |
| 67 const base::Time& experiation_time) override; |
| 68 void OnGetTokenFailure(const OAuth2TokenService::Request* request, |
| 69 const GoogleServiceAuthError& error) override; |
| 70 |
| 71 void StartOAuth2Request(); |
| 72 OAuth2TokenService::ScopeSet GetApiScopes(); |
| 73 scoped_ptr<net::URLFetcher> CreateFetcher(); |
| 74 |
| 75 // Parse the json response. |
| 76 std::vector<Interest> ExtractInterests(const std::string& response); |
| 77 |
| 78 InterestsCallback callback_; |
| 79 scoped_ptr<net::URLFetcher> fetcher_; |
| 80 std::string account_id_; |
| 81 net::URLRequestContextGetter* url_request_context_; |
| 82 bool access_token_expired_; |
| 83 std::string access_token_; |
| 84 |
| 85 scoped_ptr<OAuth2TokenService::Request> oauth_request_; |
| 86 OAuth2TokenService* token_service_; |
| 87 |
| 88 DISALLOW_COPY_AND_ASSIGN(InterestsFetcher); |
| 89 }; |
| 90 |
| 91 #endif // CHROME_BROWSER_INTERESTS_INTERESTS_FETCHER_H_ |
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