| // Copyright 2016 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 COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_JSON_REQUEST_H_ |
| #define COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_JSON_REQUEST_H_ |
| |
| #include <memory> |
| #include <string> |
| #include <utility> |
| |
| #include "base/callback.h" |
| #include "base/memory/weak_ptr.h" |
| #include "components/ntp_snippets/remote/json_request.h" |
| #include "components/ntp_snippets/status.h" |
| #include "google_apis/gaia/oauth2_token_service.h" |
| #include "net/http/http_request_headers.h" |
| |
| namespace base { |
| class Value; |
| } // namespace base |
| |
| namespace ntp_snippets { |
| |
| namespace internal { |
| |
| // A request to query contextual suggestions. |
| class ContextualJsonRequest : public net::URLFetcherDelegate { |
| public: |
| // A client can expect error_details only, if there was any error during the |
| // fetching or parsing. In successful cases, it will be an empty string. |
| using CompletedCallback = |
| base::OnceCallback<void(std::unique_ptr<base::Value> result, |
| FetchResult result_code, |
| const std::string& error_details)>; |
| |
| // Builds authenticated and non-authenticated ContextualJsonRequests. |
| class Builder { |
| public: |
| Builder(); |
| Builder(Builder&&); |
| ~Builder(); |
| |
| // Builds a Request object that contains all data to fetch new snippets. |
| std::unique_ptr<ContextualJsonRequest> Build() const; |
| |
| Builder& SetAuthentication(const std::string& account_id, |
| const std::string& auth_header); |
| Builder& SetParseJsonCallback(ParseJSONCallback callback); |
| Builder& SetUrl(const GURL& url); |
| Builder& SetUrlRequestContextGetter( |
| const scoped_refptr<net::URLRequestContextGetter>& context_getter); |
| Builder& SetContentUrl(const GURL& url); |
| |
| // These preview methods allow to inspect the Request without exposing it |
| // publicly. |
| std::string PreviewRequestBodyForTesting() { return BuildBody(); } |
| std::string PreviewRequestHeadersForTesting() { return BuildHeaders(); } |
| |
| private: |
| std::string BuildHeaders() const; |
| std::string BuildBody() const; |
| std::unique_ptr<net::URLFetcher> BuildURLFetcher( |
| net::URLFetcherDelegate* request, |
| const std::string& headers, |
| const std::string& body) const; |
| |
| std::string auth_header_; |
| ParseJSONCallback parse_json_callback_; |
| GURL url_; |
| scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_; |
| |
| // The URL for which to fetch contextual suggestions for. |
| GURL content_url_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Builder); |
| }; |
| |
| ContextualJsonRequest(const ParseJSONCallback& callback); |
| ContextualJsonRequest(ContextualJsonRequest&&); |
| ~ContextualJsonRequest() override; |
| |
| void Start(CompletedCallback callback); |
| |
| std::string GetResponseString() const; |
| |
| private: |
| // URLFetcherDelegate implementation. |
| void OnURLFetchComplete(const net::URLFetcher* source) override; |
| |
| void ParseJsonResponse(); |
| void OnJsonParsed(std::unique_ptr<base::Value> result); |
| void OnJsonError(const std::string& error); |
| |
| // The fetcher for downloading the snippets. Only non-null if a fetch is |
| // currently ongoing. |
| std::unique_ptr<net::URLFetcher> url_fetcher_; |
| |
| // This callback is called to parse a json string. It contains callbacks for |
| // error and success cases. |
| ParseJSONCallback parse_json_callback_; |
| |
| // The callback to notify when URLFetcher finished and results are available. |
| CompletedCallback request_completed_callback_; |
| |
| base::WeakPtrFactory<ContextualJsonRequest> weak_ptr_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ContextualJsonRequest); |
| }; |
| |
| } // namespace internal |
| |
| } // namespace ntp_snippets |
| |
| #endif // COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_JSON_REQUEST_H_ |