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// Copyright 2014 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 <cstddef>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/time/time.h"
#include "components/search_engines/search_engine_type.h"
#include "components/search_engines/template_url_data.h"
#include "components/search_engines/template_url_id.h"
#include "third_party/metrics_proto/omnibox_event.pb.h"
#include "third_party/metrics_proto/omnibox_input_type.pb.h"
#include "ui/gfx/geometry/size.h"
#include "url/gurl.h"
#include "url/third_party/mozilla/url_parse.h"
class SearchTermsData;
class TemplateURL;
// TemplateURLRef -------------------------------------------------------------
// A TemplateURLRef represents a single URL within the larger TemplateURL class
// (which represents an entire "search engine", see below). If
// SupportsReplacement() is true, this URL has placeholders in it, for which
// callers can substitute values to get a "real" URL using ReplaceSearchTerms().
// TemplateURLRefs always have a non-NULL |owner_| TemplateURL, which they
// access in order to get at important data like the underlying URL string or
// the associated Profile.
class TemplateURLRef {
// Magic numbers to pass to ReplaceSearchTerms() for the |accepted_suggestion|
// parameter. Most callers aren't using Suggest capabilities and should just
// NOTE: Because positive values are meaningful, make sure these are negative!
enum AcceptedSuggestion {
// Which kind of URL within our owner we are. This allows us to get at the
// correct string field. Use |INDEXED| to indicate that the numerical
// |index_in_owner_| should be used instead.
enum Type {
// Type to store <content_type, post_data> pair for POST URLs.
// The |content_type|(first part of the pair) is the content-type of
// the |post_data|(second part of the pair) which is encoded in
// "multipart/form-data" format, it also contains the MIME boundary used in
// the |post_data|. See for the details.
typedef std::pair<std::string, std::string> PostContent;
// This struct encapsulates arguments passed to
// TemplateURLRef::ReplaceSearchTerms methods. By default, only search_terms
// is required and is passed in the constructor.
struct SearchTermsArgs {
explicit SearchTermsArgs(const base::string16& search_terms);
SearchTermsArgs(const SearchTermsArgs& other);
struct ContextualSearchParams {
// Modern constructor, used when the content is sent in the HTTP header
// instead of as CGI parameters.
// The |home_country| is an ISO country code for the country that the user
// considers their permanent home (which may be different from the country
// they are currently visiting). Pass an empty string if none available.
ContextualSearchParams(int version,
int contextual_cards_version,
const std::string& home_country);
ContextualSearchParams(const ContextualSearchParams& other);
// Estimates dynamic memory usage.
// See base/trace_event/memory_usage_estimator.h for more info.
size_t EstimateMemoryUsage() const;
// The version of contextual search.
int version;
// The version of Contextual Cards data to request.
// A value of 0 indicates no data needed.
int contextual_cards_version;
// The locale of the user's home country in an ISO country code format,
// or an empty string if not available. This indicates where the user
// resides, not where they currently are.
std::string home_country;
// Estimates dynamic memory usage.
// See base/trace_event/memory_usage_estimator.h for more info.
size_t EstimateMemoryUsage() const;
// The search terms (query).
base::string16 search_terms;
// The original (input) query.
base::string16 original_query;
// The type the original input query was identified as.
metrics::OmniboxInputType input_type;
// The optional assisted query stats, aka AQS, used for logging purposes.
// This string contains impressions of all autocomplete matches shown
// at the query submission time. For privacy reasons, we require the
// search provider to support HTTPS protocol in order to receive the AQS
// param.
// For more details, see .
std::string assisted_query_stats;
// TODO: Remove along with "aq" CGI param.
int accepted_suggestion;
// The 0-based position of the cursor within the query string at the time
// the request was issued. Set to base::string16::npos if not used.
size_t cursor_position;
// The URL of the current webpage to be used for experimental zero-prefix
// suggestions.
std::string current_page_url;
// Which omnibox the user used to type the prefix.
metrics::OmniboxEventProto::PageClassification page_classification;
// Optional session token.
std::string session_token;
// Prefetch query and type.
std::string prefetch_query;
std::string prefetch_query_type;
// Additional query params provided by the suggest server.
std::string suggest_query_params;
// If set, ReplaceSearchTerms() will automatically append any extra query
// params specified via the --extra-search-query-params command-line
// argument. Generally, this should be set when dealing with the search
// TemplateURLRefs of the default search engine and the caller cares
// about the query portion of the URL. Since neither TemplateURLRef nor
// indeed TemplateURL know whether a TemplateURL is the default search
// engine, callers instead must set this manually.
bool append_extra_query_params;
// The raw content of an image thumbnail that will be used as a query for
// search-by-image frontend.
std::string image_thumbnail_content;
// When searching for an image, the URL of the original image. Callers
// should leave this empty for images specified via data: URLs.
GURL image_url;
// When searching for an image, the original size of the image.
gfx::Size image_original_size;
// True if the search was made using the app list search box. Otherwise, the
// search was made using the omnibox.
bool from_app_list;
ContextualSearchParams contextual_search_params;
TemplateURLRef(const TemplateURL* owner, Type type);
TemplateURLRef(const TemplateURL* owner, size_t index_in_owner);
TemplateURLRef(const TemplateURLRef& source);
TemplateURLRef& operator=(const TemplateURLRef& source);
// Returns the raw URL. None of the parameters will have been replaced.
std::string GetURL() const;
// Returns the raw string of the post params. Please see comments in
// prepopulated_engines_schema.json for the format.
std::string GetPostParamsString() const;
// Returns true if this URL supports search term replacement.
bool SupportsReplacement(const SearchTermsData& search_terms_data) const;
// Returns a string that is the result of replacing the search terms in
// the url with the specified arguments. We use our owner's input encoding.
// If this TemplateURLRef does not support replacement (SupportsReplacement
// returns false), an empty string is returned.
// If this TemplateURLRef uses POST, and |post_content| is not NULL, the
// |post_params_| will be replaced, encoded in "multipart/form-data" format
// and stored into |post_content|.
std::string ReplaceSearchTerms(const SearchTermsArgs& search_terms_args,
const SearchTermsData& search_terms_data,
PostContent* post_content) const;
// TODO(jnd): remove the following ReplaceSearchTerms definition which does
// not have |post_content| parameter once all reference callers pass
// |post_content| parameter.
std::string ReplaceSearchTerms(
const SearchTermsArgs& search_terms_args,
const SearchTermsData& search_terms_data) const {
return ReplaceSearchTerms(search_terms_args, search_terms_data, NULL);
// Returns true if the TemplateURLRef is valid. An invalid TemplateURLRef is
// one that contains unknown terms, or invalid characters.
bool IsValid(const SearchTermsData& search_terms_data) const;
// Returns a string representation of this TemplateURLRef suitable for
// display. The display format is the same as the format used by Firefox.
base::string16 DisplayURL(const SearchTermsData& search_terms_data) const;
// Converts a string as returned by DisplayURL back into a string as
// understood by TemplateURLRef.
static std::string DisplayURLToURLRef(const base::string16& display_url);
// If this TemplateURLRef is valid and contains one search term, this returns
// the host/path of the URL, otherwise this returns an empty string.
const std::string& GetHost(const SearchTermsData& search_terms_data) const;
std::string GetPath(const SearchTermsData& search_terms_data) const;
// If this TemplateURLRef is valid and contains one search term
// in its query or ref, this returns the key of the search term,
// otherwise this returns an empty string.
const std::string& GetSearchTermKey(
const SearchTermsData& search_terms_data) const;
// If this TemplateURLRef is valid and contains one search term,
// this returns the location of the search term,
// otherwise this returns url::Parsed::QUERY.
url::Parsed::ComponentType GetSearchTermKeyLocation(
const SearchTermsData& search_terms_data) const;
// If this TemplateURLRef is valid and contains one search term,
// this returns the fixed prefix before the search term,
// otherwise this returns an empty string.
const std::string& GetSearchTermValuePrefix(
const SearchTermsData& search_terms_data) const;
// If this TemplateURLRef is valid and contains one search term,
// this returns the fixed suffix after the search term,
// otherwise this returns an empty string.
const std::string& GetSearchTermValueSuffix(
const SearchTermsData& search_terms_data) const;
// Converts the specified term in our owner's encoding to a base::string16.
base::string16 SearchTermToString16(const base::StringPiece& term) const;
// Returns true if this TemplateURLRef has a replacement term of
// {google:baseURL} or {google:baseSuggestURL}.
bool HasGoogleBaseURLs(const SearchTermsData& search_terms_data) const;
// Use the pattern referred to by this TemplateURLRef to match the provided
// |url| and extract |search_terms| from it. Returns true if the pattern
// matches, even if |search_terms| is empty. In this case
// |search_term_component|, if not NULL, indicates whether the search terms
// were found in the query or the ref parameters; and |search_terms_position|,
// if not NULL, contains the position of the search terms in the query or the
// ref parameters. Returns false and an empty |search_terms| if the pattern
// does not match.
bool ExtractSearchTermsFromURL(
const GURL& url,
base::string16* search_terms,
const SearchTermsData& search_terms_data,
url::Parsed::ComponentType* search_term_component,
url::Component* search_terms_position) const;
// Whether the URL uses POST (as opposed to GET).
bool UsesPOSTMethod(const SearchTermsData& search_terms_data) const;
// Estimates dynamic memory usage.
// See base/trace_event/memory_usage_estimator.h for more info.
size_t EstimateMemoryUsage() const;
friend class TemplateURL;
friend class TemplateURLTest;
FRIEND_TEST_ALL_PREFIXES(TemplateURLTest, SetPrepopulatedAndParse);
FRIEND_TEST_ALL_PREFIXES(TemplateURLTest, ParseParameterKnown);
FRIEND_TEST_ALL_PREFIXES(TemplateURLTest, ParseParameterUnknown);
FRIEND_TEST_ALL_PREFIXES(TemplateURLTest, ParseURLNoKnownParameters);
FRIEND_TEST_ALL_PREFIXES(TemplateURLTest, ParseURLTwoParameters);
FRIEND_TEST_ALL_PREFIXES(TemplateURLTest, ParseURLNestedParameter);
// Enumeration of the known types.
enum ReplacementType {
// Used to identify an element of the raw url that can be replaced.
struct Replacement {
Replacement(ReplacementType type, size_t index)
: type(type), index(index), is_post_param(false) {}
ReplacementType type;
size_t index;
// Indicates the location in where the replacement is replaced. If
// |is_post_param| is false, |index| indicates the byte position in
// |parsed_url_|. Otherwise, |index| is the index of |post_params_|.
bool is_post_param;
// Stores a single parameter for a POST.
struct PostParam {
std::string name;
std::string value;
std::string content_type;
// Estimates dynamic memory usage.
// See base/trace_event/memory_usage_estimator.h for more info.
size_t EstimateMemoryUsage() const;
// The list of elements to replace.
typedef std::vector<struct Replacement> Replacements;
typedef std::vector<PostParam> PostParams;
// TemplateURLRef internally caches values to make replacement quick. This
// method invalidates any cached values.
void InvalidateCachedValues() const;
// Parses the parameter in url at the specified offset. start/end specify the
// range of the parameter in the url, including the braces. If the parameter
// is valid, url is updated to reflect the appropriate parameter. If
// the parameter is one of the known parameters an element is added to
// replacements indicating the type and range of the element. The original
// parameter is erased from the url.
// If the parameter is not a known parameter, false is returned. If this is a
// prepopulated URL, the parameter is erased, otherwise it is left alone.
bool ParseParameter(size_t start,
size_t end,
std::string* url,
Replacements* replacements) const;
// Parses the specified url, replacing parameters as necessary. If
// successful, valid is set to true, and the parsed url is returned. For all
// known parameters that are encountered an entry is added to replacements.
// If there is an error parsing the url, valid is set to false, and an empty
// string is returned. If the URL has the POST parameters, they will be
// parsed into |post_params| which will be further replaced with real search
// terms data and encoded in "multipart/form-data" format to generate the
// POST data.
std::string ParseURL(const std::string& url,
Replacements* replacements,
PostParams* post_params,
bool* valid) const;
// If the url has not yet been parsed, ParseURL is invoked.
// NOTE: While this is const, it modifies parsed_, valid_, parsed_url_ and
// search_offset_.
void ParseIfNecessary(const SearchTermsData& search_terms_data) const;
// Parses a wildcard out of |path|, putting the parsed path in |path_prefix_|
// and |path_suffix_| and setting |path_wildcard_present_| to true.
// In the absence of a wildcard, the full path will be contained in
// |path_prefix_| and |path_wildcard_present_| will be false.
void ParsePath(const std::string& path) const;
// Returns whether the path portion of this template URL is equal to the path
// in |url|, checking that URL is prefixed/suffixed by
// |path_prefix_|/|path_suffix_| if |path_wildcard_present_| is true, or equal
// to |path_prefix_| otherwise.
bool PathIsEqual(const GURL& url) const;
// Extracts the query key and host from the url.
void ParseHostAndSearchTermKey(
const SearchTermsData& search_terms_data) const;
// Encode post parameters in "multipart/form-data" format and store it
// inside |post_content|. Returns false if errors are encountered during
// encoding. This method is called each time ReplaceSearchTerms gets called.
bool EncodeFormData(const PostParams& post_params,
PostContent* post_content) const;
// Handles a replacement by using real term data. If the replacement
// belongs to a PostParam, the PostParam will be replaced by the term data.
// Otherwise, the term data will be inserted at the place that the
// replacement points to.
void HandleReplacement(const std::string& name,
const std::string& value,
const Replacement& replacement,
std::string* url) const;
// Replaces all replacements in |parsed_url_| with their actual values and
// returns the result. This is the main functionality of
// ReplaceSearchTerms().
std::string HandleReplacements(
const SearchTermsArgs& search_terms_args,
const SearchTermsData& search_terms_data,
PostContent* post_content) const;
// The TemplateURL that contains us. This should outlive us.
const TemplateURL* owner_;
// What kind of URL we are.
Type type_;
// If |type_| is |INDEXED|, this |index_in_owner_| is used instead to refer to
// a url within our owner.
size_t index_in_owner_ = 0;
// Whether the URL has been parsed.
mutable bool parsed_ = false;
// Whether the url was successfully parsed.
mutable bool valid_ = false;
// The parsed URL. All terms have been stripped out of this with
// replacements_ giving the index of the terms to replace.
mutable std::string parsed_url_;
// Do we support search term replacement?
mutable bool supports_replacements_ = false;
// The replaceable parts of url (parsed_url_). These are ordered by index
// into the string, and may be empty.
mutable Replacements replacements_;
// Whether the path contains a wildcard.
mutable bool path_wildcard_present_ = false;
// Host, port, path, key and location of the search term. These are only set
// if the url contains one search term.
mutable std::string host_;
mutable std::string port_;
mutable std::string path_prefix_;
mutable std::string path_suffix_;
mutable std::string search_term_key_;
mutable url::Parsed::ComponentType search_term_key_location_ =
mutable std::string search_term_value_prefix_;
mutable std::string search_term_value_suffix_;
mutable PostParams post_params_;
// Whether the contained URL is a pre-populated URL.
bool prepopulated_ = false;
// TemplateURL ----------------------------------------------------------------
// A TemplateURL represents a single "search engine", defined primarily as a
// subset of the Open Search Description Document
// ( plus some extensions.
// One TemplateURL contains several TemplateURLRefs, which correspond to various
// different capabilities (e.g. doing searches or getting suggestions), as well
// as a TemplateURLData containing other details like the name, keyword, etc.
// TemplateURLs are intended to be read-only for most users.
// The TemplateURLService, which handles storing and manipulating TemplateURLs,
// is made a friend so that it can be the exception to this pattern.
class TemplateURL {
using TemplateURLVector = std::vector<TemplateURL*>;
using OwnedTemplateURLVector = std::vector<std::unique_ptr<TemplateURL>>;
enum Type {
// Regular search engine.
// Installed by extension through Override Settings API.
// The keyword associated with an extension that uses the Omnibox API.
// Installed only on this device. Should not be synced.
// An AssociatedExtensionInfo represents information about the extension that
// added the search engine.
struct AssociatedExtensionInfo {
AssociatedExtensionInfo(const std::string& extension_id,
base::Time install_time,
bool wants_to_be_default_engine);
// Estimates dynamic memory usage.
// See base/trace_event/memory_usage_estimator.h for more info.
size_t EstimateMemoryUsage() const;
std::string extension_id;
// Used to resolve conflicts when there are multiple extensions specifying
// the default search engine. The most recently-installed wins.
base::Time install_time;
// Whether the search engine is supposed to be default.
bool wants_to_be_default_engine;
explicit TemplateURL(const TemplateURLData& data, Type type = NORMAL);
// Constructor for extension controlled engine. |type| must be
TemplateURL(const TemplateURLData& data,
Type type,
std::string extension_id,
base::Time install_time,
bool wants_to_be_default_engine);
// Generates a suitable keyword for the specified url, which must be valid.
// This is guaranteed not to return an empty string, since TemplateURLs should
// never have an empty keyword.
static base::string16 GenerateKeyword(const GURL& url);
// Generates a favicon URL from the specified url.
static GURL GenerateFaviconURL(const GURL& url);
// Returns true if |t_url| and |data| are equal in all meaningful respects.
// Static to allow either or both params to be NULL.
static bool MatchesData(const TemplateURL* t_url,
const TemplateURLData* data,
const SearchTermsData& search_terms_data);
const TemplateURLData& data() const { return data_; }
const base::string16& short_name() const { return data_.short_name(); }
// An accessor for the short_name, but adjusted so it can be appropriately
// displayed even if it is LTR and the UI is RTL.
base::string16 AdjustedShortNameForLocaleDirection() const;
const base::string16& keyword() const { return data_.keyword(); }
const std::string& url() const { return data_.url(); }
const std::string& suggestions_url() const { return data_.suggestions_url; }
const std::string& image_url() const { return data_.image_url; }
const std::string& new_tab_url() const { return data_.new_tab_url; }
const std::string& contextual_search_url() const {
return data_.contextual_search_url;
const std::string& search_url_post_params() const {
return data_.search_url_post_params;
const std::string& suggestions_url_post_params() const {
return data_.suggestions_url_post_params;
const std::string& image_url_post_params() const {
return data_.image_url_post_params;
const std::vector<std::string>& alternate_urls() const {
return data_.alternate_urls;
const GURL& favicon_url() const { return data_.favicon_url; }
const GURL& logo_url() const { return data_.logo_url; }
const GURL& doodle_url() const { return data_.doodle_url; }
const GURL& originating_url() const { return data_.originating_url; }
bool safe_for_autoreplace() const { return data_.safe_for_autoreplace; }
const std::vector<std::string>& input_encodings() const {
return data_.input_encodings;
TemplateURLID id() const { return; }
base::Time date_created() const { return data_.date_created; }
base::Time last_modified() const { return data_.last_modified; }
base::Time last_visited() const { return data_.last_visited; }
bool created_by_policy() const { return data_.created_by_policy; }
int usage_count() const { return data_.usage_count; }
int prepopulate_id() const { return data_.prepopulate_id; }
const std::string& sync_guid() const { return data_.sync_guid; }
const std::vector<TemplateURLRef>& url_refs() const { return url_refs_; }
const TemplateURLRef& url_ref() const {
// Sanity check for
return url_refs_.back();
const TemplateURLRef& suggestions_url_ref() const {
return suggestions_url_ref_;
const TemplateURLRef& image_url_ref() const { return image_url_ref_; }
const TemplateURLRef& new_tab_url_ref() const { return new_tab_url_ref_; }
const TemplateURLRef& contextual_search_url_ref() const {
return contextual_search_url_ref_;
Type type() const { return type_; }
const AssociatedExtensionInfo* GetExtensionInfoForTesting() const {
return extension_info_.get();
// Returns true if |url| supports replacement.
bool SupportsReplacement(const SearchTermsData& search_terms_data) const;
// Returns true if any URLRefs use Googe base URLs.
bool HasGoogleBaseURLs(const SearchTermsData& search_terms_data) const;
// Returns true if this TemplateURL uses Google base URLs and has a keyword
// of "google.TLD". We use this to decide whether we can automatically
// update the keyword to reflect the current Google base URL TLD.
bool IsGoogleSearchURLWithReplaceableKeyword(
const SearchTermsData& search_terms_data) const;
// Returns true if the keywords match or if
// IsGoogleSearchURLWithReplaceableKeyword() is true for both |this| and
// |other|.
bool HasSameKeywordAs(const TemplateURLData& other,
const SearchTermsData& search_terms_data) const;
// Returns the id of the extension that added this search engine. Only call
// this for TemplateURLs of type NORMAL_CONTROLLED_BY_EXTENSION or
std::string GetExtensionId() const;
// Returns the type of this search engine, or SEARCH_ENGINE_OTHER if no
// engines match.
SearchEngineType GetEngineType(
const SearchTermsData& search_terms_data) const;
// Use the alternate URLs and the search URL to match the provided |url|
// and extract |search_terms| from it. Returns false and an empty
// |search_terms| if no search terms can be matched. The URLs are matched in
// the order listed in |url_refs_| (see comment there).
bool ExtractSearchTermsFromURL(const GURL& url,
const SearchTermsData& search_terms_data,
base::string16* search_terms) const;
// Returns true if non-empty search terms could be extracted from |url| using
// ExtractSearchTermsFromURL(). In other words, this returns whether |url|
// could be the result of performing a search with |this|.
bool IsSearchURL(const GURL& url,
const SearchTermsData& search_terms_data) const;
// Given a |url| corresponding to this TemplateURL, identifies the search
// terms and replaces them with the ones in |search_terms_args|, leaving the
// other parameters untouched. If the replacement fails, returns false and
// leaves |result| untouched. This is used by mobile ports to perform query
// refinement.
bool ReplaceSearchTermsInURL(
const GURL& url,
const TemplateURLRef::SearchTermsArgs& search_terms_args,
const SearchTermsData& search_terms_data,
GURL* result) const;
// Encodes the search terms from |search_terms_args| so that we know the
// |input_encoding|. Returns the |encoded_terms| and the
// |encoded_original_query|. |encoded_terms| may be escaped as path or query
// depending on |is_in_query|; |encoded_original_query| is always escaped as
// query.
void EncodeSearchTerms(
const TemplateURLRef::SearchTermsArgs& search_terms_args,
bool is_in_query,
std::string* input_encoding,
base::string16* encoded_terms,
base::string16* encoded_original_query) const;
// Returns the search url for this template URL.
// Returns an empty GURL if this template URL has no url().
GURL GenerateSearchURL(const SearchTermsData& search_terms_data) const;
// TemplateURL internally caches values derived from a passed SearchTermsData
// to make its functions quick. This method invalidates any cached values and
// it should be called after SearchTermsData has been changed.
void InvalidateCachedValues() const;
// Estimates dynamic memory usage.
// See base/trace_event/memory_usage_estimator.h for more info.
size_t EstimateMemoryUsage() const;
friend class TemplateURLService;
void CopyFrom(const TemplateURL& other);
void SetURL(const std::string& url);
void SetPrepopulateId(int id);
// Resets the keyword if IsGoogleSearchURLWithReplaceableKeyword() or |force|.
// The |force| parameter is useful when the existing keyword is known to be
// a placeholder. The resulting keyword is generated using
// GenerateSearchURL() and GenerateKeyword().
void ResetKeywordIfNecessary(const SearchTermsData& search_terms_data,
bool force);
// Resizes the |url_refs_| vector, which always holds the search URL as the
// last item.
void ResizeURLRefVector();
// Uses the alternate URLs and the search URL to match the provided |url|
// and extract |search_terms| from it as well as the |search_terms_component|
// (either REF or QUERY) and |search_terms_component| at which the
// |search_terms| are found in |url|. See also ExtractSearchTermsFromURL().
bool FindSearchTermsInURL(const GURL& url,
const SearchTermsData& search_terms_data,
base::string16* search_terms,
url::Parsed::ComponentType* search_terms_component,
url::Component* search_terms_position) const;
TemplateURLData data_;
// Contains TemplateURLRefs corresponding to the alternate URLs and the search
// URL, in priority order: the URL at index 0 is treated as the highest
// priority and the primary search URL is treated as the lowest priority. For
// example, if a TemplateURL has alternate URL "http://foo/#q={searchTerms}"
// and search URL "http://foo/?q={searchTerms}", and the URL to be decoded is
// "http://foo/?q=a#q=b", the alternate URL will match first and the decoded
// search term will be "b". Note that since every TemplateURLRef has a
// primary search URL, this vector is never empty.
std::vector<TemplateURLRef> url_refs_;
TemplateURLRef suggestions_url_ref_;
TemplateURLRef image_url_ref_;
TemplateURLRef new_tab_url_ref_;
TemplateURLRef contextual_search_url_ref_;
std::unique_ptr<AssociatedExtensionInfo> extension_info_;
const Type type_;
// Caches the computed engine type across successive calls to GetEngineType().
mutable SearchEngineType engine_type_;
// TODO(sky): Add date last parsed OSD file.