zero_suggest_provider.h revision bb1529ce867d8845a77ec7cdf3e3003ef1771a40
1// Copyright (c) 2012 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// This file contains the zero-suggest autocomplete provider. This experimental 6// provider is invoked when the user focuses in the omnibox prior to editing, 7// and generates search query suggestions based on the current URL. To enable 8// this provider, point --experimental-zero-suggest-url-prefix at an 9// appropriate suggestion service. 10// 11// HUGE DISCLAIMER: This is just here for experimenting and will probably be 12// deleted entirely as we revise how suggestions work with the omnibox. 13 14#ifndef CHROME_BROWSER_AUTOCOMPLETE_ZERO_SUGGEST_PROVIDER_H_ 15#define CHROME_BROWSER_AUTOCOMPLETE_ZERO_SUGGEST_PROVIDER_H_ 16 17#include <map> 18#include <string> 19#include <vector> 20 21#include "base/basictypes.h" 22#include "base/compiler_specific.h" 23#include "base/memory/scoped_ptr.h" 24#include "base/strings/string16.h" 25#include "chrome/browser/autocomplete/autocomplete_provider.h" 26#include "chrome/browser/autocomplete/search_provider.h" 27#include "net/url_request/url_fetcher_delegate.h" 28 29class AutocompleteInput; 30class GURL; 31class TemplateURLService; 32 33namespace base { 34class ListValue; 35class Value; 36} 37 38namespace net { 39class URLFetcher; 40} 41 42// Autocomplete provider for searches based on the current URL. 43// 44// The controller will call StartZeroSuggest when the user focuses in the 45// omnibox. After construction, the autocomplete controller repeatedly calls 46// Start() with some user input, each time expecting to receive an updated 47// set of matches. 48// 49// TODO(jered): Consider deleting this class and building this functionality 50// into SearchProvider after dogfood and after we break the association between 51// omnibox text and suggestions. 52class ZeroSuggestProvider : public AutocompleteProvider, 53 public net::URLFetcherDelegate { 54 public: 55 // Creates and returns an instance of this provider. 56 static ZeroSuggestProvider* Create(AutocompleteProviderListener* listener, 57 Profile* profile); 58 59 // AutocompleteProvider: 60 virtual void Start(const AutocompleteInput& input, 61 bool /*minimal_changes*/) OVERRIDE; 62 virtual void Stop(bool clear_cached_results) OVERRIDE; 63 64 // Adds provider-specific information to omnibox event logs. 65 virtual void AddProviderInfo(ProvidersInfo* provider_info) const OVERRIDE; 66 67 // Sets |field_trial_triggered_| to false. 68 virtual void ResetSession() OVERRIDE; 69 70 // net::URLFetcherDelegate 71 virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE; 72 73 // Initiates a new fetch for the given |url| of classification 74 // |page_classification|. |permanent_text| is the omnibox text 75 // for the current page. 76 void StartZeroSuggest( 77 const GURL& url, 78 AutocompleteInput::PageClassification page_classification, 79 const string16& permanent_text); 80 81 private: 82 ZeroSuggestProvider(AutocompleteProviderListener* listener, 83 Profile* profile); 84 85 virtual ~ZeroSuggestProvider(); 86 87 bool ShouldRunZeroSuggest(const GURL& url) const; 88 89 // Whether the URL can get Zero Suggest. For example, don't send the URL of 90 // non-Google HTTPS requests because it may contain sensitive information. 91 bool ShouldSendURL(const GURL& url) const; 92 93 // The 4 functions below (that take classes defined in SearchProvider as 94 // arguments) were copied and trimmed from SearchProvider. 95 // TODO(hfung): Refactor them into a new base class common to both 96 // ZeroSuggestProvider and SearchProvider. 97 98 // From the OpenSearch formatted response |root_val|, populate query 99 // suggestions into |suggest_results|, navigation suggestions into 100 // |navigation_results|, and the verbatim relevance score into 101 // |verbatim_relevance|. 102 void FillResults(const base::Value& root_val, 103 int* verbatim_relevance, 104 SearchProvider::SuggestResults* suggest_results, 105 SearchProvider::NavigationResults* navigation_results); 106 107 // Creates AutocompleteMatches to search |template_url| for "<suggestion>" for 108 // all suggestions in |results|, and adds them to |map|. 109 void AddSuggestResultsToMap(const SearchProvider::SuggestResults& results, 110 const TemplateURL* template_url, 111 SearchProvider::MatchMap* map); 112 113 // Creates an AutocompleteMatch with the provided |relevance| and |type| to 114 // search |template_url| for |query_string|. |accepted_suggestion| will be 115 // used to generate Assisted Query Stats. 116 // 117 // Adds this match to |map|; if such a match already exists, whichever one 118 // has lower relevance is eliminated. 119 void AddMatchToMap(int relevance, 120 AutocompleteMatch::Type type, 121 const TemplateURL* template_url, 122 const string16& query_string, 123 int accepted_suggestion, 124 SearchProvider::MatchMap* map); 125 126 // Returns an AutocompleteMatch for a navigational suggestion |navigation|. 127 AutocompleteMatch NavigationToMatch( 128 const SearchProvider::NavigationResult& navigation); 129 130 // Fetches zero-suggest suggestions for |current_query_|. 131 void Run(); 132 133 // Parses results from the zero-suggest server and updates results. 134 void ParseSuggestResults(const base::Value& root_val); 135 136 // Converts the parsed results to a set of AutocompleteMatches and adds them 137 // to |matches_|. Also update the histograms for how many results were 138 // received. 139 void ConvertResultsToAutocompleteMatches(); 140 141 // Returns an AutocompleteMatch for the current URL. The match should be in 142 // the top position so that pressing enter has the effect of reloading the 143 // page. 144 AutocompleteMatch MatchForCurrentURL(); 145 146 // Used to build default search engine URLs for suggested queries. 147 TemplateURLService* template_url_service_; 148 149 // The URL for which a suggestion fetch is pending. 150 std::string current_query_; 151 152 // The type of page the user is viewing (a search results page doing search 153 // term replacement, an arbitrary URL, etc.). 154 AutocompleteInput::PageClassification current_page_classification_; 155 156 // Copy of OmniboxEditModel::permanent_text_. 157 string16 permanent_text_; 158 159 // Fetcher used to retrieve results. 160 scoped_ptr<net::URLFetcher> fetcher_; 161 // Whether there's a pending request in flight. 162 bool have_pending_request_; 163 164 // Suggestion for the current URL. 165 AutocompleteMatch current_url_match_; 166 // Navigation suggestions for the most recent ZeroSuggest input URL. 167 SearchProvider::NavigationResults navigation_results_; 168 // Query suggestions for the most recent ZeroSuggest input URL. 169 SearchProvider::MatchMap query_matches_map_; 170 // The relevance score for the URL of the current page. 171 int verbatim_relevance_; 172 173 // Whether a field trial, if any, has triggered in the most recent 174 // autocomplete query. This field is set to true if the last request 175 // was a zero suggest request, the provider has completed and their 176 // corresponding response contained '"google:fieldtrialtriggered":true'. 177 bool field_trial_triggered_; 178 // Whether a zero suggest request triggered a field trial in the omnibox 179 // session. The user could have clicked on a suggestion when zero suggest 180 // triggered (same condition as field_trial_triggered_), or triggered zero 181 // suggest but kept typing. 182 bool field_trial_triggered_in_session_; 183 184 DISALLOW_COPY_AND_ASSIGN(ZeroSuggestProvider); 185}; 186 187#endif // CHROME_BROWSER_AUTOCOMPLETE_ZERO_SUGGEST_PROVIDER_H_ 188