chromium/chrome/browser/lookalikes/lookalike_url_navigation_throttle.h

// 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.

#ifndef CHROME_BROWSER_LOOKALIKES_LOOKALIKE_URL_NAVIGATION_THROTTLE_H_
#define CHROME_BROWSER_LOOKALIKES_LOOKALIKE_URL_NAVIGATION_THROTTLE_H_

#include <memory>
#include <set>
#include <string>
#include <vector>

#include "base/feature_list.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/timer/timer.h"
#include "chrome/browser/lookalikes/lookalike_url_blocking_page.h"
#include "components/url_formatter/url_formatter.h"
#include "content/public/browser/navigation_throttle.h"
#include "services/metrics/public/cpp/ukm_source_id.h"

namespace content {
class NavigationHandle;
}  // namespace content

class Profile;

namespace lookalikes {
struct DomainInfo;
}

// A feature to enable Prewarming the Lookalike check during navigation. URLs in
// the redirect chain are queried while the request is on the wire instead of
// when the request is ready to commit.
BASE_DECLARE_FEATURE(kPrewarmLookalikeCheck);

// Returns true if the redirect is deemed to be safe. These are generally
// defensive registrations where the domain owner redirects the IDN to the ASCII
// domain. See the unit tests for examples.
// In short, |url| must redirect to the root of |safe_url_host| or one
// of its subdomains.
bool IsSafeRedirect(const std::string& safe_url_host,
                    const std::vector<GURL>& redirect_chain);

// Observes navigations and shows an interstitial if the navigated domain name
// is visually similar to a top domain or a domain with a site engagement score.
//
// Remember to update //docs/idn.md with the appropriate information if you
// modify the lookalike heuristics.
//
// This throttle assumes that two navigations never share the same throttle.
class LookalikeUrlNavigationThrottle : public content::NavigationThrottle { … };

#endif  // CHROME_BROWSER_LOOKALIKES_LOOKALIKE_URL_NAVIGATION_THROTTLE_H_