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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "components/omnibox/browser/builtin_provider.h"
#include <stddef.h>
#include <string>
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "components/omnibox/browser/autocomplete_input.h"
#include "components/omnibox/browser/autocomplete_match.h"
#include "components/omnibox/browser/autocomplete_match_classification.h"
#include "components/omnibox/browser/autocomplete_provider_client.h"
#include "components/url_formatter/url_fixer.h"
#include "third_party/metrics_proto/omnibox_focus_type.pb.h"
#include "third_party/metrics_proto/omnibox_input_type.pb.h"
#include "url/url_constants.h"
const int BuiltinProvider::kRelevance = 860;
BuiltinProvider::BuiltinProvider(AutocompleteProviderClient* client)
: AutocompleteProvider(AutocompleteProvider::TYPE_BUILTIN),
client_(client) {
builtins_ = client_->GetBuiltinURLs();
template_url_service_ = client->GetTemplateURLService();
}
void BuiltinProvider::Start(const AutocompleteInput& input,
bool minimal_changes) {
matches_.clear();
if (input.IsZeroSuggest() ||
(input.type() == metrics::OmniboxInputType::EMPTY)) {
return;
}
if (input.type() != metrics::OmniboxInputType::QUERY) {
DoBuiltinAutocompletion(input.text());
UpdateRelevanceScores(input);
}
}
BuiltinProvider::~BuiltinProvider() = default;
void BuiltinProvider::DoBuiltinAutocompletion(const std::u16string& text) {
const size_t kAboutSchemeLength = strlen(url::kAboutScheme);
const std::u16string kAbout =
base::StrCat({url::kAboutScheme16, url::kStandardSchemeSeparator16});
const std::u16string embedderAbout = base::StrCat(
{base::UTF8ToUTF16(client_->GetEmbedderRepresentationOfAboutScheme()),
url::kStandardSchemeSeparator16});
const int kUrl = ACMatchClassification::URL;
const int kMatch = kUrl | ACMatchClassification::MATCH;
bool starting_about = base::StartsWith(embedderAbout, text,
base::CompareCase::INSENSITIVE_ASCII);
if (starting_about ||
base::StartsWith(kAbout, text, base::CompareCase::INSENSITIVE_ASCII)) {
// Highlight the input portion matching |embedderAbout|; or if the user
// has input "about:" (with optional slashes), highlight the whole
// |embedderAbout|.
TermMatches style_matches;
if (starting_about)
style_matches.emplace_back(0, 0, text.length());
else if (text.length() > kAboutSchemeLength)
style_matches.emplace_back(0, 0, embedderAbout.length());
ACMatchClassifications styles =
ClassifyTermMatches(style_matches, std::string::npos, kMatch, kUrl);
// Include some common builtin URLs as the user types the scheme.
for (const std::u16string& url :
client_->GetBuiltinsToProvideAsUserTypes()) {
AddBuiltinMatch(url, std::u16string(), styles);
}
} else {
// Match input about: or |embedderAbout| URL input against builtin URLs.
GURL url = url_formatter::FixupURL(base::UTF16ToUTF8(text), std::string());
const bool text_ends_with_slash =
base::EndsWith(text, u"/", base::CompareCase::SENSITIVE);
// BuiltinProvider doesn't know how to suggest valid ?query or #fragment
// extensions to builtin URLs.
if (url.SchemeIs(client_->GetEmbedderRepresentationOfAboutScheme()) &&
url.has_host() && !url.has_query() && !url.has_ref()) {
// Suggest about:blank for substrings, taking URL fixup into account.
// Chrome does not support trailing slashes or paths for about:blank.
const std::u16string blank_host = u"blank";
const std::u16string host = base::UTF8ToUTF16(url.host());
if (base::StartsWith(text, url::kAboutScheme16,
base::CompareCase::INSENSITIVE_ASCII) &&
base::StartsWith(blank_host, host,
base::CompareCase::INSENSITIVE_ASCII) &&
(url.path().length() <= 1) && !text_ends_with_slash) {
std::u16string match(url::kAboutBlankURL16);
const size_t corrected_length = kAboutSchemeLength + 1 + host.length();
TermMatches style_matches = {{0, 0, corrected_length}};
ACMatchClassifications styles =
ClassifyTermMatches(style_matches, match.length(), kMatch, kUrl);
AddBuiltinMatch(match, match.substr(corrected_length), styles);
}
// Include the path for sub-pages (e.g. "chrome://settings/browser").
std::u16string host_and_path = base::UTF8ToUTF16(url.host() + url.path());
base::TrimString(host_and_path, u"/", &host_and_path);
size_t match_length = embedderAbout.length() + host_and_path.length();
for (Builtins::const_iterator i(builtins_.begin());
(i != builtins_.end()) && (matches_.size() < provider_max_matches_);
++i) {
if (base::StartsWith(*i, host_and_path,
base::CompareCase::INSENSITIVE_ASCII)) {
std::u16string match_string = embedderAbout + *i;
TermMatches style_matches = {{0, 0, match_length}};
ACMatchClassifications styles = ClassifyTermMatches(
style_matches, match_string.length(), kMatch, kUrl);
// FixupURL() may have dropped a trailing slash on the user's input.
// Ensure that in that case, we don't inline autocomplete unless the
// autocompletion restores the slash. This prevents us from e.g.
// trying to add a 'y' to an input like "chrome://histor/".
std::u16string inline_autocompletion(
match_string.substr(match_length));
if (text_ends_with_slash &&
!base::StartsWith(match_string.substr(match_length), u"/",
base::CompareCase::INSENSITIVE_ASCII))
inline_autocompletion = std::u16string();
AddBuiltinMatch(match_string, inline_autocompletion, styles);
}
}
}
}
}
void BuiltinProvider::UpdateRelevanceScores(const AutocompleteInput& input) {
// Provide a relevance score for each match.
for (size_t i = 0; i < matches_.size(); ++i) {
matches_[i].relevance += matches_.size() - (i + 1);
}
// If allowing completions is okay and there's a match that's considered
// appropriate to be the default match, mark it as such and give it a high
// enough score to beat url-what-you-typed.
size_t default_match_index;
// None of the built in site URLs contain whitespaces so we can safely prevent
// autocompletion when the input has a trailing whitespace in order to avoid
// autocompleting e.g. 'chrome://s ettings' when the input is 'chrome://s '.
bool input_allowed_to_have_default_match =
!input.prevent_inline_autocomplete() &&
(input.text().empty() || !base::IsUnicodeWhitespace(input.text().back()));
if (input_allowed_to_have_default_match &&
HasMatchThatShouldBeDefault(&default_match_index)) {
matches_[default_match_index].relevance = 1250;
matches_[default_match_index].allowed_to_be_default_match = true;
}
}
void BuiltinProvider::AddBuiltinMatch(const std::u16string& match_string,
const std::u16string& inline_completion,
const ACMatchClassifications& styles) {
AutocompleteMatch match(this, kRelevance, false,
AutocompleteMatchType::NAVSUGGEST);
match.suggest_type = omnibox::TYPE_NAVIGATION;
match.fill_into_edit = match_string;
match.inline_autocompletion = inline_completion;
match.destination_url = GURL(match_string);
match.contents = match_string;
match.contents_class = styles;
matches_.push_back(match);
}
bool BuiltinProvider::HasMatchThatShouldBeDefault(size_t* index) const {
if (matches_.size() == 0)
return false;
// If there's only one possible completion of the user's input and it's not
// empty, it should be allowed to be the default match.
if (matches_.size() == 1) {
*index = 0;
return !matches_[0].inline_autocompletion.empty();
}
// If there's a non-empty completion that is a prefix of all of the others,
// it should be allowed to be the default match.
size_t shortest = 0;
for (size_t i = 1; i < matches_.size(); ++i) {
if (matches_[i].contents.length() < matches_[shortest].contents.length())
shortest = i;
}
if (matches_[shortest].inline_autocompletion.empty())
return false;
for (size_t i = 0; i < matches_.size(); ++i) {
if (!base::StartsWith(matches_[i].contents, matches_[shortest].contents,
base::CompareCase::INSENSITIVE_ASCII)) {
return false;
}
}
*index = shortest;
return true;
}
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