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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Brought to you by the letter D and the number 2.
#include <map>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "base/callback_forward.h"
#include "base/containers/circular_deque.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/string_piece.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "net/base/net_export.h"
#include "net/cookies/canonical_cookie.h"
#include "net/cookies/cookie_constants.h"
#include "net/cookies/cookie_monster_change_dispatcher.h"
#include "net/cookies/cookie_store.h"
#include "net/log/net_log_with_source.h"
#include "starboard/types.h"
#include "url/gurl.h"
namespace base {
class HistogramBase;
} // namespace base
namespace net {
class ChannelIDService;
class CookieChangeDispatcher;
// The cookie monster is the system for storing and retrieving cookies. It has
// an in-memory list of all cookies, and synchronizes non-session cookies to an
// optional permanent storage that implements the PersistentCookieStore
// interface.
// Tasks may be deferred if all affected cookies are not yet loaded from the
// backing store. Otherwise, callbacks may be invoked immediately.
// A cookie task is either pending loading of the entire cookie store, or
// loading of cookies for a specific domain key (GetKey(), roughly eTLD+1). In
// the former case, the cookie callback will be queued in tasks_pending_ while
// PersistentCookieStore chain loads the cookie store on DB thread. In the
// latter case, the cookie callback will be queued in tasks_pending_for_key_
// while PermanentCookieStore loads cookies for the specified domain key on DB
// thread.
class NET_EXPORT CookieMonster : public CookieStore {
class PersistentCookieStore;
// Terminology:
// * The 'top level domain' (TLD) of an internet domain name is
// the terminal "." free substring (e.g. "com" for
// or
// * The 'effective top level domain' (eTLD) is the longest
// "." initiated terminal substring of an internet domain name
// that is controlled by a general domain registrar.
// (e.g. "" for
// * The 'effective top level domain plus one' (eTLD+1) is the
// shortest "." delimited terminal substring of an internet
// domain name that is not controlled by a general domain
// registrar (e.g. "" for, or
// "" for The general assumption
// is that all hosts and domains under an eTLD+1 share some
// administrative control.
// CookieMap is the central data structure of the CookieMonster. It
// is a map whose values are pointers to CanonicalCookie data
// structures (the data structures are owned by the CookieMonster
// and must be destroyed when removed from the map). The key is based on the
// effective domain of the cookies. If the domain of the cookie has an
// eTLD+1, that is the key for the map. If the domain of the cookie does not
// have an eTLD+1, the key of the map is the host the cookie applies to (it is
// not legal to have domain cookies without an eTLD+1). This rule
// excludes cookies for, e.g, ".com", "", or ".internalnetwork".
// This behavior is the same as the behavior in Firefox v 3.6.10.
// NOTE(deanm):
// I benchmarked hash_multimap vs multimap. We're going to be query-heavy
// so it would seem like hashing would help. However they were very
// close, with multimap being a tiny bit faster. I think this is because
// our map is at max around 1000 entries, and the additional complexity
// for the hashing might not overcome the O(log(1000)) for querying
// a multimap. Also, multimap is standard, another reason to use it.
// TODO(rdsmith): This benchmark should be re-done now that we're allowing
// substantially more entries in the map.
using CookieMap =
std::multimap<std::string, std::unique_ptr<CanonicalCookie>>;
using CookieMapItPair = std::pair<CookieMap::iterator, CookieMap::iterator>;
using CookieItVector = std::vector<CookieMap::iterator>;
// Cookie garbage collection thresholds. Based off of the Mozilla defaults.
// When the number of cookies gets to k{Domain,}MaxCookies
// purge down to k{Domain,}MaxCookies - k{Domain,}PurgeCookies.
// It might seem scary to have a high purge value, but really it's not.
// You just make sure that you increase the max to cover the increase
// in purge, and we would have been purging the same number of cookies.
// We're just going through the garbage collection process less often.
// Note that the DOMAIN values are per eTLD+1; see comment for the
// CookieMap typedef. So, e.g., the maximum number of cookies allowed for
// and all of its subdomains will be 150-180.
// Any cookies accessed more recently than kSafeFromGlobalPurgeDays will not
// be evicted by global garbage collection, even if we have more than
// kMaxCookies. This does not affect domain garbage collection.
static const size_t kDomainMaxCookies;
static const size_t kDomainPurgeCookies;
static const size_t kMaxCookies;
static const size_t kPurgeCookies;
// Quota for cookies with {low, medium, high} priorities within a domain.
static const size_t kDomainCookiesQuotaLow;
static const size_t kDomainCookiesQuotaMedium;
static const size_t kDomainCookiesQuotaHigh;
// The store passed in should not have had Init() called on it yet. This
// class will take care of initializing it. The backing store is NOT owned by
// this class, but it must remain valid for the duration of the cookie
// monster's existence. If |store| is NULL, then no backing store will be
// updated. |channel_id_service| is a non-owninng pointer for the
// corresponding ChannelIDService used with this CookieStore. The
// |channel_id_service| must outlive the CookieMonster. |net_log| must outlive
// the CookieMonster. Both |channel_id_service| and |net_log| can be null.
CookieMonster(scoped_refptr<PersistentCookieStore> store,
ChannelIDService* channel_id_service,
NetLog* net_log);
// Only used during unit testing.
// |net_log| must outlive the CookieMonster.
CookieMonster(scoped_refptr<PersistentCookieStore> store,
base::TimeDelta last_access_threshold,
NetLog* net_log);
~CookieMonster() override;
// Writes all the cookies in |list| into the store, replacing all cookies
// currently present in store.
// This method does not flush the backend.
// TODO(rdsmith, mmenke): Do not use this function; it is deprecated
// and should be removed.
// See
void SetAllCookiesAsync(const CookieList& list, SetCookiesCallback callback);
// CookieStore implementation.
void SetCookieWithOptionsAsync(const GURL& url,
const std::string& cookie_line,
const CookieOptions& options,
SetCookiesCallback callback) override;
void SetCanonicalCookieAsync(std::unique_ptr<CanonicalCookie> cookie,
bool secure_source,
bool modify_http_only,
SetCookiesCallback callback) override;
void GetCookieListWithOptionsAsync(const GURL& url,
const CookieOptions& options,
GetCookieListCallback callback) override;
void GetAllCookiesAsync(GetCookieListCallback callback) override;
void DeleteCookieAsync(const GURL& url,
const std::string& cookie_name,
base::OnceClosure callback) override;
void DeleteCanonicalCookieAsync(const CanonicalCookie& cookie,
DeleteCallback callback) override;
void DeleteAllCreatedInTimeRangeAsync(
const CookieDeletionInfo::TimeRange& creation_range,
DeleteCallback callback) override;
void DeleteAllMatchingInfoAsync(CookieDeletionInfo delete_info,
DeleteCallback callback) override;
void DeleteSessionCookiesAsync(DeleteCallback) override;
void FlushStore(base::OnceClosure callback) override;
void SetForceKeepSessionState() override;
CookieChangeDispatcher& GetChangeDispatcher() override;
// Resets the list of cookieable schemes to the supplied schemes. Does
// nothing if called after first use of the instance (i.e. after the
// instance initialization process).
void SetCookieableSchemes(const std::vector<std::string>& schemes);
// Enables writing session cookies into the cookie database. If this this
// method is called, it must be called before first use of the instance
// (i.e. as part of the instance initialization process).
void SetPersistSessionCookies(bool persist_session_cookies);
// Determines if the scheme of the URL is a scheme that cookies will be
// stored for.
bool IsCookieableScheme(const std::string& scheme);
// The default list of schemes the cookie monster can handle.
static const char* const kDefaultCookieableSchemes[];
static const int kDefaultCookieableSchemesCount;
bool IsEphemeral() override;
void DumpMemoryStats(base::trace_event::ProcessMemoryDump* pmd,
const std::string& parent_absolute_name) const override;
// Find a key based on the given domain, which will be used to find all
// cookies potentially relevant to it. This is used for lookup in cookies_ as
// well as for PersistentCookieStore::LoadCookiesForKey. See comment on keys
// before the CookieMap typedef.
static std::string GetKey(base::StringPiece domain);
CookieMonster(scoped_refptr<PersistentCookieStore> store,
ChannelIDService* channel_id_service,
base::TimeDelta last_access_threshold,
NetLog* net_log);
// For garbage collection constants.
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, TestHostGarbageCollection);
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, GarbageCollectionTriggers);
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, TestGCTimes);
// For validation of key values.
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, TestDomainTree);
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, TestImport);
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, GetKey);
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, TestGetKey);
// For FindCookiesForKey.
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, ShortLivedSessionCookies);
// For CookieSource histogram enum.
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, CookieSourceHistogram);
// For kSafeFromGlobalPurgeDays in CookieStore.
FRIEND_TEST_ALL_PREFIXES(CookieMonsterTest, EvictSecureCookies);
// For CookieDeleteEquivalent histogram enum.
// Internal reasons for deletion, used to populate informative histograms
// and to provide a public cause for onCookieChange notifications.
// If you add or remove causes from this list, please be sure to also update
// the CookieChangeCause mapping inside ChangeCauseMapping. New items (if
// necessary) should be added at the end of the list, just before
enum DeletionCause {
DELETE_COOKIE_DONT_RECORD = 5, // For final cleanup after flush to store.
// Cookies evicted during domain-level garbage collection.
// Cookies evicted during global garbage collection (which takes place after
// domain-level garbage collection fails to bring the cookie store under
// the overall quota.
// A common idiom is to remove a cookie by overwriting it with an
// already-expired expiration date. This captures that case.
// Cookies are not allowed to contain control characters in the name or
// value. However, we used to allow them, so we are now evicting any such
// cookies as we load them. See
// When strict secure cookies is enabled, non-secure cookies are evicted
// right after expired cookies.
// This enum is used to generate a histogramed bitmask measureing the types
// of stored cookies. Please do not reorder the list when adding new entries.
// New items MUST be added at the end of the list, just before
enum CookieType {
// Used to populate a histogram containing information about the
// sources of Secure and non-Secure cookies: that is, whether such
// cookies are set by origins with cryptographic or non-cryptographic
// schemes. Please do not reorder the list when adding new
// entries. New items MUST be added at the end of the list, just
// that a cookie was set or overwritten from a URL with the given type
// of scheme. This enum should not be used when cookies are *cleared*,
// because its purpose is to understand if Chrome can deprecate the
// ability of HTTP urls to set/overwrite Secure cookies.
enum CookieSource {
// Used to populate a histogram for cookie setting in the "delete equivalent"
// step. Measures total attempts to delete an equivalent cookie, and
// categorizes the outcome.
// * COOKIE_DELETE_EQUIVALENT_ATTEMPT is incremented each time a cookie is
// set, causing the equivalent deletion algorithm to execute.
// * COOKIE_DELETE_EQUIVALENT_SKIPPING_SECURE is incremented when a non-secure
// cookie is ignored because an equivalent, but secure, cookie already
// exists.
// * COOKIE_DELETE_EQUIVALENT_WOULD_HAVE_DELETED is incremented when a cookie
// is skipped due to `secure` rules (e.g. whenever
// COOKIE_DELETE_EQUIVALENT_SKIPPING_SECURE is incremented), but would have
// caused a deletion without those rules.
// TODO(mkwst): Now that we've shipped strict secure cookie checks, we don't
// need this value anymore.
// * COOKIE_DELETE_EQUIVALENT_FOUND is incremented each time an equivalent
// cookie is found (and deleted).
// an equivalent cookie that also shared the same value with the new cookie
// is found (and deleted).
// Please do not reorder or remove entries. New entries must be added to the
// end of the list, just before COOKIE_DELETE_EQUIVALENT_LAST_ENTRY.
enum CookieDeleteEquivalent {
// The number of days since last access that cookies will not be subject
// to global garbage collection.
static const int kSafeFromGlobalPurgeDays;
// Record statistics every kRecordStatisticsIntervalSeconds of uptime.
static const int kRecordStatisticsIntervalSeconds = 10 * 60;
// Sets a canonical cookie, deletes equivalents and performs garbage
// collection. |source_secure| indicates if the cookie is being set
// from a secure source (e.g. a cryptographic scheme).
// |modify_http_only| indicates if this setting operation is allowed
// to affect http_only cookies.
void SetCanonicalCookie(std::unique_ptr<CanonicalCookie> cookie,
bool secure_source,
bool can_modify_httponly,
SetCookiesCallback callback);
void GetAllCookies(GetCookieListCallback callback);
void GetCookieListWithOptions(const GURL& url,
const CookieOptions& options,
GetCookieListCallback callback);
void DeleteAllCreatedInTimeRange(
const CookieDeletionInfo::TimeRange& creation_range,
DeleteCallback callback);
void DeleteAllMatchingInfo(net::CookieDeletionInfo delete_info,
DeleteCallback callback);
void SetCookieWithOptions(const GURL& url,
const std::string& cookie_line,
const CookieOptions& options,
SetCookiesCallback callback);
void DeleteCookie(const GURL& url,
const std::string& cookie_name,
base::OnceClosure callback);
void DeleteCanonicalCookie(const CanonicalCookie& cookie,
DeleteCallback callback);
void DeleteSessionCookies(DeleteCallback callback);
// The first access to the cookie store initializes it. This method should be
// called before any access to the cookie store.
void MarkCookieStoreAsInitialized();
// Fetches all cookies if the backing store exists and they're not already
// being fetched.
void FetchAllCookiesIfNecessary();
// Fetches all cookies from the backing store.
void FetchAllCookies();
// Whether all cookies should be fetched as soon as any is requested.
bool ShouldFetchAllCookiesWhenFetchingAnyCookie();
// Stores cookies loaded from the backing store and invokes any deferred
// calls. |beginning_time| should be the moment PersistentCookieStore::Load
// was invoked and is used for reporting histogram_time_blocked_on_load_.
// See PersistentCookieStore::Load for details on the contents of cookies.
void OnLoaded(base::TimeTicks beginning_time,
std::vector<std::unique_ptr<CanonicalCookie>> cookies);
// Stores cookies loaded from the backing store and invokes the deferred
// task(s) pending loading of cookies associated with the domain key
// (GetKey, roughly eTLD+1). Called when all cookies for the domain key have
// been loaded from DB. See PersistentCookieStore::Load for details on the
// contents of cookies.
void OnKeyLoaded(const std::string& key,
std::vector<std::unique_ptr<CanonicalCookie>> cookies);
// Stores the loaded cookies.
void StoreLoadedCookies(
std::vector<std::unique_ptr<CanonicalCookie>> cookies);
// Invokes deferred calls.
void InvokeQueue();
// Checks that |cookies_| matches our invariants, and tries to repair any
// inconsistencies. (In other words, it does not have duplicate cookies).
void EnsureCookiesMapIsValid();
// Checks for any duplicate cookies for CookieMap key |key| which lie between
// |begin| and |end|. If any are found, all but the most recent are deleted.
void TrimDuplicateCookiesForKey(const std::string& key,
CookieMap::iterator begin,
CookieMap::iterator end);
void SetDefaultCookieableSchemes();
void FindCookiesForHostAndDomain(const GURL& url,
const CookieOptions& options,
std::vector<CanonicalCookie*>* cookies);
void FindCookiesForKey(const std::string& key,
const GURL& url,
const CookieOptions& options,
const base::Time& current,
std::vector<CanonicalCookie*>* cookies);
// Delete any cookies that are equivalent to |ecc| (same path, domain, etc).
// |source_secure| indicates if the source may override existing secure
// cookies.
// If |skip_httponly| is true, httponly cookies will not be deleted. The
// return value will be true if |skip_httponly| skipped an httponly cookie or
// the cookie to delete was Secure and the scheme of |ecc| is insecure. |key|
// is the key to find the cookie in cookies_; see the comment before the
// CookieMap typedef for details.
// If a cookie is deleted, and its value matches |ecc|'s value, then
// |creation_date_to_inherit| will be set to that cookie's creation date.
// NOTE: There should never be more than a single matching equivalent cookie.
bool DeleteAnyEquivalentCookie(const std::string& key,
const CanonicalCookie& ecc,
bool source_secure,
bool skip_httponly,
bool already_expired,
base::Time* creation_date_to_inherit);
// Inserts |cc| into cookies_. Returns an iterator that points to the inserted
// cookie in cookies_. Guarantee: all iterators to cookies_ remain valid.
CookieMap::iterator InternalInsertCookie(const std::string& key,
std::unique_ptr<CanonicalCookie> cc,
bool sync_to_store);
// Sets all cookies from |list| after deleting any equivalent cookie.
// For data gathering purposes, this routine is treated as if it is
// restoring saved cookies; some statistics are not gathered in this case.
void SetAllCookies(CookieList list, SetCookiesCallback callback);
void InternalUpdateCookieAccessTime(CanonicalCookie* cc,
const base::Time& current_time);
// |deletion_cause| argument is used for collecting statistics and choosing
// the correct CookieChangeCause for OnCookieChange notifications. Guarantee:
// All iterators to cookies_, except for the deleted entry, remain valid.
void InternalDeleteCookie(CookieMap::iterator it,
bool sync_to_store,
DeletionCause deletion_cause);
// If the number of cookies for CookieMap key |key|, or globally, are
// over the preset maximums above, garbage collect, first for the host and
// then globally. See comments above garbage collection threshold
// constants for details.
// Returns the number of cookies deleted (useful for debugging).
size_t GarbageCollect(const base::Time& current, const std::string& key);
// Helper for GarbageCollect(). Deletes up to |purge_goal| cookies with a
// priority less than or equal to |priority| from |cookies|, while ensuring
// that at least the |to_protect| most-recent cookies are retained.
// |protected_secure_cookies| specifies whether or not secure cookies should
// be protected from deletion.
// |cookies| must be sorted from least-recent to most-recent.
// Returns the number of cookies deleted.
size_t PurgeLeastRecentMatches(CookieItVector* cookies,
CookiePriority priority,
size_t to_protect,
size_t purge_goal,
bool protect_secure_cookies);
// Helper for GarbageCollect(); can be called directly as well. Deletes all
// expired cookies in |itpair|. If |cookie_its| is non-NULL, all the
// non-expired cookies from |itpair| are appended to |cookie_its|.
// Returns the number of cookies deleted.
size_t GarbageCollectExpired(const base::Time& current,
const CookieMapItPair& itpair,
CookieItVector* cookie_its);
// Helper for GarbageCollect(). Deletes all cookies in the range specified by
// [|it_begin|, |it_end|). Returns the number of cookies deleted.
size_t GarbageCollectDeleteRange(const base::Time& current,
DeletionCause cause,
CookieItVector::iterator cookie_its_begin,
CookieItVector::iterator cookie_its_end);
// Helper for GarbageCollect(). Deletes cookies in |cookie_its| from least to
// most recently used, but only before |safe_date|. Also will stop deleting
// when the number of remaining cookies hits |purge_goal|.
// Sets |earliest_time| to be the earliest last access time of a cookie that
// was not deleted, or base::Time() if no such cookie exists.
size_t GarbageCollectLeastRecentlyAccessed(const base::Time& current,
const base::Time& safe_date,
size_t purge_goal,
CookieItVector cookie_its,
base::Time* earliest_time);
bool HasCookieableScheme(const GURL& url);
// Statistics support
// This function should be called repeatedly, and will record
// statistics if a sufficient time period has passed.
void RecordPeriodicStats(const base::Time& current_time);
// Initialize the above variables; should only be called from
// the constructor.
void InitializeHistograms();
// The resolution of our time isn't enough, so we do something
// ugly and increment when we've seen the same time twice.
base::Time CurrentTime();
// Defers the callback until the full coookie database has been loaded. If
// it's already been loaded, runs the callback synchronously.
void DoCookieCallback(base::OnceClosure callback);
// Defers the callback until the cookies relevant to given URL have been
// loaded. If they've already been loaded, runs the callback synchronously.
void DoCookieCallbackForURL(base::OnceClosure callback, const GURL& url);
// Defers the callback until the cookies relevant to given host or domain
// have been loaded. If they've already been loaded, runs the callback
// synchronously.
void DoCookieCallbackForHostOrDomain(base::OnceClosure callback,
base::StringPiece host_or_domain);
// Histogram variables; see CookieMonster::InitializeHistograms() in
// for details.
base::HistogramBase* histogram_expiration_duration_minutes_;
base::HistogramBase* histogram_count_;
base::HistogramBase* histogram_cookie_type_;
base::HistogramBase* histogram_cookie_source_scheme_;
base::HistogramBase* histogram_cookie_delete_equivalent_;
base::HistogramBase* histogram_time_blocked_on_load_;
CookieMap cookies_;
CookieMonsterChangeDispatcher change_dispatcher_;
// Indicates whether the cookie store has been initialized.
bool initialized_;
// Indicates whether the cookie store has started fetching all cookies.
bool started_fetching_all_cookies_;
// Indicates whether the cookie store has finished fetching all cookies.
bool finished_fetching_all_cookies_;
// List of domain keys that have been loaded from the DB.
std::set<std::string> keys_loaded_;
// Map of domain keys to their associated task queues. These tasks are blocked
// until all cookies for the associated domain key eTLD+1 are loaded from the
// backend store.
std::map<std::string, base::circular_deque<base::OnceClosure>>
// Queues tasks that are blocked until all cookies are loaded from the backend
// store.
base::circular_deque<base::OnceClosure> tasks_pending_;
// Once a global cookie task has been seen, all per-key tasks must be put in
// |tasks_pending_| instead of |tasks_pending_for_key_| to ensure a reasonable
// view of the cookie store. This is more to ensure fancy cookie export/import
// code has a consistent view of the CookieStore, rather than out of concern
// for typical use.
bool seen_global_task_;
NetLogWithSource net_log_;
scoped_refptr<PersistentCookieStore> store_;
base::Time last_time_seen_;
// Minimum delay after updating a cookie's LastAccessDate before we will
// update it again.
const base::TimeDelta last_access_threshold_;
// Approximate date of access time of least recently accessed cookie
// in |cookies_|. Note that this is not guaranteed to be accurate, only a)
// to be before or equal to the actual time, and b) to be accurate
// immediately after a garbage collection that scans through all the cookies
// (When garbage collection does not scan through all cookies, it may not be
// updated). This value is used to determine whether global garbage collection
// might find cookies to purge. Note: The default Time() constructor will
// create a value that compares earlier than any other time value, which is
// wanted. Thus this value is not initialized.
base::Time earliest_access_time_;
std::vector<std::string> cookieable_schemes_;
ChannelIDService* channel_id_service_;
base::Time last_statistic_record_time_;
bool persist_session_cookies_;
base::WeakPtrFactory<CookieMonster> weak_ptr_factory_;
typedef base::RefCountedThreadSafe<CookieMonster::PersistentCookieStore>
class NET_EXPORT CookieMonster::PersistentCookieStore
: public RefcountedPersistentCookieStore {
typedef base::Callback<void(std::vector<std::unique_ptr<CanonicalCookie>>)>
// Initializes the store and retrieves the existing cookies. This will be
// called only once at startup. The callback will return all the cookies
// that are not yet returned to CookieMonster by previous priority loads.
// |loaded_callback| may not be NULL.
// |net_log| is a NetLogWithSource that may be copied if the persistent
// store wishes to log NetLog events.
virtual void Load(const LoadedCallback& loaded_callback,
const NetLogWithSource& net_log) = 0;
// Does a priority load of all cookies for the domain key (eTLD+1). The
// callback will return all the cookies that are not yet returned by previous
// loads, which includes cookies for the requested domain key if they are not
// already returned, plus all cookies that are chain-loaded and not yet
// returned to CookieMonster.
// |loaded_callback| may not be NULL.
virtual void LoadCookiesForKey(const std::string& key,
const LoadedCallback& loaded_callback) = 0;
virtual void AddCookie(const CanonicalCookie& cc) = 0;
virtual void UpdateCookieAccessTime(const CanonicalCookie& cc) = 0;
virtual void DeleteCookie(const CanonicalCookie& cc) = 0;
// Instructs the store to not discard session only cookies on shutdown.
virtual void SetForceKeepSessionState() = 0;
// Sets a callback that will be run before the store flushes. If |callback|
// performs any async operations, the store will not wait for those to finish
// before flushing.
virtual void SetBeforeFlushCallback(base::RepeatingClosure callback) = 0;
// Flushes the store and posts |callback| when complete. |callback| may be
// NULL.
virtual void Flush(base::OnceClosure callback) = 0;
PersistentCookieStore() {}
virtual ~PersistentCookieStore() {}
friend class base::RefCountedThreadSafe<PersistentCookieStore>;
} // namespace net