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      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 #include "chrome/browser/autocomplete/builtin_provider.h"
      6 
      7 #include <algorithm>
      8 
      9 #include "base/strings/string_util.h"
     10 #include "base/strings/utf_string_conversions.h"
     11 #include "chrome/browser/autocomplete/history_provider.h"
     12 #include "chrome/common/url_constants.h"
     13 #include "components/metrics/proto/omnibox_input_type.pb.h"
     14 #include "components/omnibox/autocomplete_input.h"
     15 #include "components/url_fixer/url_fixer.h"
     16 
     17 namespace {
     18 
     19 #if !defined(OS_ANDROID)
     20 // This list should be kept in sync with chrome/common/url_constants.h.
     21 // Only include useful sub-pages, confirmation alerts are not useful.
     22 const char* const kChromeSettingsSubPages[] = {
     23   chrome::kAutofillSubPage,
     24   chrome::kClearBrowserDataSubPage,
     25   chrome::kContentSettingsSubPage,
     26   chrome::kContentSettingsExceptionsSubPage,
     27   chrome::kImportDataSubPage,
     28   chrome::kLanguageOptionsSubPage,
     29   chrome::kPasswordManagerSubPage,
     30   chrome::kResetProfileSettingsSubPage,
     31   chrome::kSearchEnginesSubPage,
     32   chrome::kSyncSetupSubPage,
     33 #if defined(OS_CHROMEOS)
     34   chrome::kInternetOptionsSubPage,
     35 #endif
     36 };
     37 #endif // !defined(OS_ANDROID)
     38 
     39 }  // namespace
     40 
     41 const int BuiltinProvider::kRelevance = 860;
     42 
     43 BuiltinProvider::BuiltinProvider()
     44     : AutocompleteProvider(AutocompleteProvider::TYPE_BUILTIN) {
     45   std::vector<std::string> builtins(
     46       chrome::kChromeHostURLs,
     47       chrome::kChromeHostURLs + chrome::kNumberOfChromeHostURLs);
     48   std::sort(builtins.begin(), builtins.end());
     49   for (std::vector<std::string>::iterator i(builtins.begin());
     50        i != builtins.end(); ++i)
     51     builtins_.push_back(base::ASCIIToUTF16(*i));
     52 
     53 #if !defined(OS_ANDROID)
     54   base::string16 settings(base::ASCIIToUTF16(chrome::kChromeUISettingsHost) +
     55                           base::ASCIIToUTF16("/"));
     56   for (size_t i = 0; i < arraysize(kChromeSettingsSubPages); i++) {
     57     builtins_.push_back(
     58         settings + base::ASCIIToUTF16(kChromeSettingsSubPages[i]));
     59   }
     60 #endif
     61 }
     62 
     63 void BuiltinProvider::Start(const AutocompleteInput& input,
     64                             bool minimal_changes) {
     65   matches_.clear();
     66   if ((input.type() == metrics::OmniboxInputType::INVALID) ||
     67       (input.type() == metrics::OmniboxInputType::FORCED_QUERY) ||
     68       (input.type() == metrics::OmniboxInputType::QUERY))
     69     return;
     70 
     71   const size_t kAboutSchemeLength = strlen(url::kAboutScheme);
     72   const base::string16 kAbout =
     73       base::ASCIIToUTF16(url::kAboutScheme) +
     74       base::ASCIIToUTF16(url::kStandardSchemeSeparator);
     75   const base::string16 kChrome = base::ASCIIToUTF16(content::kChromeUIScheme) +
     76       base::ASCIIToUTF16(url::kStandardSchemeSeparator);
     77 
     78   const int kUrl = ACMatchClassification::URL;
     79   const int kMatch = kUrl | ACMatchClassification::MATCH;
     80 
     81   base::string16 text = input.text();
     82   bool starting_chrome = StartsWith(kChrome, text, false);
     83   if (starting_chrome || StartsWith(kAbout, text, false)) {
     84     ACMatchClassifications styles;
     85     // Highlight the input portion matching "chrome://"; or if the user has
     86     // input "about:" (with optional slashes), highlight the whole "chrome://".
     87     bool highlight = starting_chrome || text.length() > kAboutSchemeLength;
     88     styles.push_back(ACMatchClassification(0, highlight ? kMatch : kUrl));
     89     size_t offset = starting_chrome ? text.length() : kChrome.length();
     90     if (highlight)
     91       styles.push_back(ACMatchClassification(offset, kUrl));
     92     // Include some common builtin chrome URLs as the user types the scheme.
     93     AddMatch(base::ASCIIToUTF16(chrome::kChromeUIChromeURLsURL),
     94              base::string16(), styles);
     95 #if !defined(OS_ANDROID)
     96     AddMatch(base::ASCIIToUTF16(chrome::kChromeUISettingsURL),
     97              base::string16(), styles);
     98 #endif
     99     AddMatch(base::ASCIIToUTF16(chrome::kChromeUIVersionURL),
    100              base::string16(), styles);
    101   } else {
    102     // Match input about: or chrome: URL input against builtin chrome URLs.
    103     GURL url = url_fixer::FixupURL(base::UTF16ToUTF8(text), std::string());
    104     // BuiltinProvider doesn't know how to suggest valid ?query or #fragment
    105     // extensions to chrome: URLs.
    106     if (url.SchemeIs(content::kChromeUIScheme) && url.has_host() &&
    107         !url.has_query() && !url.has_ref()) {
    108       // Suggest about:blank for substrings, taking URL fixup into account.
    109       // Chrome does not support trailing slashes or paths for about:blank.
    110       const base::string16 blank_host = base::ASCIIToUTF16("blank");
    111       const base::string16 host = base::UTF8ToUTF16(url.host());
    112       if (StartsWith(text, base::ASCIIToUTF16(url::kAboutScheme), false) &&
    113           StartsWith(blank_host, host, false) && (url.path().length() <= 1) &&
    114           !EndsWith(text, base::ASCIIToUTF16("/"), false)) {
    115         ACMatchClassifications styles;
    116         styles.push_back(ACMatchClassification(0, kMatch));
    117         base::string16 match = base::ASCIIToUTF16(url::kAboutBlankURL);
    118         // Measure the length of the matching host after the "about:" scheme.
    119         const size_t corrected_length = kAboutSchemeLength + 1 + host.length();
    120         if (blank_host.length() > host.length())
    121           styles.push_back(ACMatchClassification(corrected_length, kUrl));
    122         AddMatch(match, match.substr(corrected_length), styles);
    123       }
    124 
    125       // Include the path for sub-pages (e.g. "chrome://settings/browser").
    126       base::string16 host_and_path = base::UTF8ToUTF16(url.host() + url.path());
    127       base::TrimString(host_and_path, base::ASCIIToUTF16("/"), &host_and_path);
    128       size_t match_length = kChrome.length() + host_and_path.length();
    129       for (Builtins::const_iterator i(builtins_.begin());
    130           (i != builtins_.end()) && (matches_.size() < kMaxMatches); ++i) {
    131         if (StartsWith(*i, host_and_path, false)) {
    132           ACMatchClassifications styles;
    133           // Highlight the "chrome://" scheme, even for input "about:foo".
    134           styles.push_back(ACMatchClassification(0, kMatch));
    135           base::string16 match_string = kChrome + *i;
    136           if (match_string.length() > match_length)
    137             styles.push_back(ACMatchClassification(match_length, kUrl));
    138           AddMatch(match_string, match_string.substr(match_length), styles);
    139         }
    140       }
    141     }
    142   }
    143 
    144   for (size_t i = 0; i < matches_.size(); ++i)
    145     matches_[i].relevance = kRelevance + matches_.size() - (i + 1);
    146   if (!HistoryProvider::PreventInlineAutocomplete(input) &&
    147       (matches_.size() == 1)) {
    148     // If there's only one possible completion of the user's input and
    149     // allowing completions is okay, give the match a high enough score to
    150     // allow it to beat url-what-you-typed and be inlined.
    151     matches_[0].relevance = 1250;
    152     matches_[0].allowed_to_be_default_match = true;
    153   }
    154 }
    155 
    156 BuiltinProvider::~BuiltinProvider() {}
    157 
    158 void BuiltinProvider::AddMatch(const base::string16& match_string,
    159                                const base::string16& inline_completion,
    160                                const ACMatchClassifications& styles) {
    161   AutocompleteMatch match(this, kRelevance, false,
    162                           AutocompleteMatchType::NAVSUGGEST);
    163   match.fill_into_edit = match_string;
    164   match.inline_autocompletion = inline_completion;
    165   match.destination_url = GURL(match_string);
    166   match.contents = match_string;
    167   match.contents_class = styles;
    168   matches_.push_back(match);
    169 }
    170