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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_PRELOADING_PREFETCH_PREFETCH_ORIGIN_PROBER_H_
#define CONTENT_BROWSER_PRELOADING_PREFETCH_PREFETCH_ORIGIN_PROBER_H_
#include <optional>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "content/browser/preloading/prefetch/prefetch_probe_result.h"
#include "content/common/content_export.h"
#include "net/base/address_list.h"
#include "url/gurl.h"
namespace content {
class BrowserContext;
class PrefetchCanaryChecker;
// This class handles all probing and canary checks for the prefetch proxy
// feature. Calling code should use |ShouldProbeOrigins| to determine if a probe
// is needed before using prefetched resources and if so, call |Probe|. See
// http://crbug.com/1109992 for more details.
class CONTENT_EXPORT PrefetchOriginProber {
public:
PrefetchOriginProber(BrowserContext* browser_context,
const GURL& dns_canary_check_url,
const GURL& tls_canary_check_url);
virtual ~PrefetchOriginProber();
PrefetchOriginProber(const PrefetchOriginProber&) = delete;
PrefetchOriginProber& operator=(const PrefetchOriginProber) = delete;
// Run canary checks if they are not already cached.
void RunCanaryChecksIfNeeded() const;
// Returns true if a probe needs to be done before using prefetched resources.
virtual bool ShouldProbeOrigins() const;
// Starts a probe to |url| and calls |callback| with an
// |PrefetchProbeResult| to indicate success.
using OnProbeResultCallback = base::OnceCallback<void(PrefetchProbeResult)>;
virtual void Probe(const GURL& url, OnProbeResultCallback callback);
private:
// Does a DNS resolution for a DNS or TLS probe, passing all the arguments to
// |OnDNSResolved|.
void StartDNSResolution(const GURL& url,
OnProbeResultCallback callback,
bool also_do_tls_connect);
// If the DNS resolution was successful, this will either run |callback| for a
// DNS probe, or start the TLS socket for a TLS probe. This is determined by
// |also_do_tls_connect|. If the DNS resolution failed, |callback| is run with
// failure.
void OnDNSResolved(const GURL& url,
OnProbeResultCallback callback,
bool also_do_tls_connect,
int net_error,
const std::optional<net::AddressList>& resolved_addresses);
// Both DNS and TLS probes need to resolve DNS. This starts the TLS probe with
// the |addresses| from the DNS resolution.
void DoTLSProbeAfterDNSResolution(const GURL& url,
OnProbeResultCallback callback,
const net::AddressList& addresses);
// The current browser context, not owned.
raw_ptr<BrowserContext> browser_context_;
// The TLS canary url checker.
std::unique_ptr<PrefetchCanaryChecker> tls_canary_checker_;
// The DNS canary url checker.
std::unique_ptr<PrefetchCanaryChecker> dns_canary_checker_;
base::WeakPtrFactory<PrefetchOriginProber> weak_factory_{this};
};
} // namespace content
#endif // CONTENT_BROWSER_PRELOADING_PREFETCH_PREFETCH_ORIGIN_PROBER_H_
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