chromium/chrome/browser/sharing/click_to_call/click_to_call_utils.cc

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/sharing/click_to_call/click_to_call_utils.h"

#include <optional>

#include "base/ranges/algorithm.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/sharing/click_to_call/phone_number_regex.h"
#include "chrome/browser/sharing/sharing_service_factory.h"
#include "components/prefs/pref_service.h"
#include "components/sharing_message/features.h"
#include "components/sharing_message/pref_names.h"
#include "components/sharing_message/sharing_service.h"
#include "content/public/browser/browser_context.h"
#include "third_party/abseil-cpp/absl/strings/ascii.h"
#include "third_party/re2/src/re2/re2.h"
#include "url/url_constants.h"
#include "url/url_util.h"

namespace {

// Upper bound on length of selection text to avoid performance issues. Take
// into account numbers with country code and spaces '+99 0 999 999 9999' when
// reducing the max length.
constexpr int kSelectionTextMaxLength = …;

// Upper bound on digits in selected text to reduce false positives. This
// matches the maximum number of digits in phone numbers according to E.164 and
// showed a good tradeoff between false negatives vs. false positives.
constexpr int kSelectionTextMaxDigits = …;

bool IsClickToCallEnabled(content::BrowserContext* browser_context) { … }

// Returns the first possible phone number in |selection_text| given the
// |regex_variant| to be used or std::nullopt if the regex did not match.
std::optional<std::string> ExtractPhoneNumber(
    const std::string& selection_text) { … }

// Unescapes and returns the URL contents.
std::string GetUnescapedURLContent(const GURL& url) { … }

}  // namespace

bool ShouldOfferClickToCallForURL(content::BrowserContext* browser_context,
                                  const GURL& url) { … }

std::optional<std::string> ExtractPhoneNumberForClickToCall(
    content::BrowserContext* browser_context,
    const std::string& selection_text) { … }

bool IsUrlSafeForClickToCall(const GURL& url) { … }