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Bug 1815307: Group RFP methods into logical sections r=timhuang 

Differential Revision: https://phabricator.services.mozilla.com/D170888
This commit is contained in:
Tom Ritter 2023-03-21 14:14:46 +00:00
Родитель 4ee9882811
Коммит ebd5b77e14
2 изменённых файлов: 344 добавлений и 293 удалений
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609
toolkit/components/resistfingerprinting/nsRFPService.cpp
Просмотреть файл

@ -101,47 +101,15 @@ static constexpr uint32_t kVideoDroppedRatio = 5;
#define RFP_DEFAULT_SPOOFING_KEYBOARD_LANG KeyboardLang::EN
#define RFP_DEFAULT_SPOOFING_KEYBOARD_REGION KeyboardRegion::US
// ============================================================================
// ============================================================================
// ============================================================================
// Structural Stuff & Pref Observing
NS_IMPL_ISUPPORTS(nsRFPService, nsIObserver)
static StaticRefPtr<nsRFPService> sRFPService;
static bool sInitialized = false;
nsTHashMap<KeyboardHashKey, const SpoofingKeyboardCode*>*
nsRFPService::sSpoofingKeyboardCodes = nullptr;
KeyboardHashKey::KeyboardHashKey(const KeyboardLangs aLang,
const KeyboardRegions aRegion,
const KeyNameIndexType aKeyIdx,
const nsAString& aKey)
: mLang(aLang), mRegion(aRegion), mKeyIdx(aKeyIdx), mKey(aKey) {}
KeyboardHashKey::KeyboardHashKey(KeyTypePointer aOther)
: mLang(aOther->mLang),
mRegion(aOther->mRegion),
mKeyIdx(aOther->mKeyIdx),
mKey(aOther->mKey) {}
KeyboardHashKey::KeyboardHashKey(KeyboardHashKey&& aOther)
: PLDHashEntryHdr(std::move(aOther)),
mLang(std::move(aOther.mLang)),
mRegion(std::move(aOther.mRegion)),
mKeyIdx(std::move(aOther.mKeyIdx)),
mKey(std::move(aOther.mKey)) {}
KeyboardHashKey::~KeyboardHashKey() = default;
bool KeyboardHashKey::KeyEquals(KeyTypePointer aOther) const {
return mLang == aOther->mLang && mRegion == aOther->mRegion &&
mKeyIdx == aOther->mKeyIdx && mKey == aOther->mKey;
}
KeyboardHashKey::KeyTypePointer KeyboardHashKey::KeyToPointer(KeyType aKey) {
return &aKey;
}
PLDHashNumber KeyboardHashKey::HashKey(KeyTypePointer aKey) {
PLDHashNumber hash = mozilla::HashString(aKey->mKey);
return mozilla::AddToHash(hash, aKey->mRegion, aKey->mKeyIdx, aKey->mLang);
}
/* static */
nsRFPService* nsRFPService::GetOrCreate() {
@ -161,6 +129,211 @@ nsRFPService* nsRFPService::GetOrCreate() {
return sRFPService;
}
static const char* gCallbackPrefs[] = {
RESIST_FINGERPRINTING_PREF, RFP_TIMER_PREF,
RFP_TIMER_UNCONDITIONAL_PREF, RFP_TIMER_VALUE_PREF,
RFP_JITTER_VALUE_PREF, nullptr,
};
nsresult nsRFPService::Init() {
MOZ_ASSERT(NS_IsMainThread());
nsresult rv;
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
NS_ENSURE_TRUE(obs, NS_ERROR_NOT_AVAILABLE);
rv = obs->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
NS_ENSURE_SUCCESS(rv, rv);
if (XRE_IsParentProcess()) {
rv = obs->AddObserver(this, LAST_PB_SESSION_EXITED_TOPIC, false);
NS_ENSURE_SUCCESS(rv, rv);
rv = obs->AddObserver(this, OBSERVER_TOPIC_IDLE_DAILY, false);
NS_ENSURE_SUCCESS(rv, rv);
}
#if defined(XP_WIN)
rv = obs->AddObserver(this, PROFILE_INITIALIZED_TOPIC, false);
NS_ENSURE_SUCCESS(rv, rv);
#endif
Preferences::RegisterCallbacks(nsRFPService::PrefChanged, gCallbackPrefs,
this);
// We backup the original TZ value here.
const char* tzValue = PR_GetEnv("TZ");
if (tzValue != nullptr) {
mInitialTZValue = nsCString(tzValue);
}
// Call Update here to cache the values of the prefs and set the timezone.
UpdateRFPPref();
return rv;
}
// This function updates every fingerprinting item necessary except
// timing-related
void nsRFPService::UpdateRFPPref() {
MOZ_ASSERT(NS_IsMainThread());
bool resistFingerprinting = nsContentUtils::ShouldResistFingerprinting();
JS::SetReduceMicrosecondTimePrecisionCallback(
nsRFPService::ReduceTimePrecisionAsUSecsWrapper);
// set fdlibm pref
JS::SetUseFdlibmForSinCosTan(
StaticPrefs::javascript_options_use_fdlibm_for_sin_cos_tan() ||
resistFingerprinting);
// The JavaScript engine can already set the timezone per realm/global,
// but we think there are still other users of libc that rely
// on the TZ environment variable.
if (!StaticPrefs::privacy_resistFingerprinting_testing_setTZtoUTC()) {
return;
}
if (resistFingerprinting) {
PR_SetEnv("TZ=UTC");
} else if (sInitialized) {
// We will not touch the TZ value if 'privacy.resistFingerprinting' is false
// during the time of initialization.
if (!mInitialTZValue.IsEmpty()) {
nsAutoCString tzValue = "TZ="_ns + mInitialTZValue;
static char* tz = nullptr;
// If the tz has been set before, we free it first since it will be
// allocated a new value later.
if (tz != nullptr) {
free(tz);
}
// PR_SetEnv() needs the input string been leaked intentionally, so
// we copy it here.
tz = ToNewCString(tzValue, mozilla::fallible);
if (tz != nullptr) {
PR_SetEnv(tz);
}
} else {
#if defined(XP_WIN)
// For Windows, we reset the TZ to an empty string. This will make Windows
// to use its system timezone.
PR_SetEnv("TZ=");
#else
// For POSIX like system, we reset the TZ to the /etc/localtime, which is
// the system timezone.
PR_SetEnv("TZ=:/etc/localtime");
#endif
}
}
// If and only if the time zone was changed above, propagate the change to the
// <time.h> functions and the JS runtime.
if (resistFingerprinting || sInitialized) {
// localtime_r (and other functions) may not call tzset, so do this here
// after changing TZ to ensure all <time.h> functions use the new time zone.
#if defined(XP_WIN)
_tzset();
#else
tzset();
#endif
nsJSUtils::ResetTimeZone();
}
}
void nsRFPService::StartShutdown() {
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
if (XRE_IsParentProcess()) {
obs->RemoveObserver(this, LAST_PB_SESSION_EXITED_TOPIC);
obs->RemoveObserver(this, OBSERVER_TOPIC_IDLE_DAILY);
}
}
Preferences::UnregisterCallbacks(nsRFPService::PrefChanged, gCallbackPrefs,
this);
}
// static
void nsRFPService::PrefChanged(const char* aPref, void* aSelf) {
static_cast<nsRFPService*>(aSelf)->PrefChanged(aPref);
}
void nsRFPService::PrefChanged(const char* aPref) {
nsDependentCString pref(aPref);
if (pref.EqualsLiteral(RESIST_FINGERPRINTING_PREF)) {
UpdateRFPPref();
#if defined(XP_WIN)
if (!XRE_IsE10sParentProcess()) {
// Windows does not follow POSIX. Updates to the TZ environment variable
// are not reflected immediately on that platform as they are on UNIX
// systems without this call.
_tzset();
}
#endif
}
}
NS_IMETHODIMP
nsRFPService::Observe(nsISupports* aObject, const char* aTopic,
const char16_t* aMessage) {
if (strcmp(NS_XPCOM_SHUTDOWN_OBSERVER_ID, aTopic) == 0) {
StartShutdown();
}
#if defined(XP_WIN)
else if (!strcmp(PROFILE_INITIALIZED_TOPIC, aTopic)) {
// If we're e10s, then we don't need to run this, since the child process
// will simply inherit the environment variable from the parent process, in
// which case it's unnecessary to call _tzset().
if (XRE_IsParentProcess() && !XRE_IsE10sParentProcess()) {
// Windows does not follow POSIX. Updates to the TZ environment variable
// are not reflected immediately on that platform as they are on UNIX
// systems without this call.
_tzset();
}
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
NS_ENSURE_TRUE(obs, NS_ERROR_NOT_AVAILABLE);
nsresult rv = obs->RemoveObserver(this, PROFILE_INITIALIZED_TOPIC);
NS_ENSURE_SUCCESS(rv, rv);
}
#endif
if (strcmp(LAST_PB_SESSION_EXITED_TOPIC, aTopic) == 0) {
// Clear the private session key when the private session ends so that we
// can generate a new key for the new private session.
ClearSessionKey(true);
}
if (!strcmp(OBSERVER_TOPIC_IDLE_DAILY, aTopic)) {
if (StaticPrefs::
privacy_resistFingerprinting_randomization_daily_reset_enabled()) {
ClearSessionKey(false);
}
if (StaticPrefs::
privacy_resistFingerprinting_randomization_daily_reset_private_enabled()) {
ClearSessionKey(true);
}
}
return NS_OK;
}
// ============================================================================
// ============================================================================
// ============================================================================
// Reduce Timer Precision Stuff
constexpr double RFP_TIME_ATOM_MS = 16.667; // 60Hz, 1000/60 but rounded.
/*
In RFP RAF always runs at 60Hz, so we're ~0.02% off of 1000/60 here.
@ -517,6 +690,75 @@ double nsRFPService::ReduceTimePrecisionAsUSecsWrapper(
GetTimerPrecisionType(callerType));
}
/* static */
TimerPrecisionType nsRFPService::GetTimerPrecisionType(
RTPCallerType aRTPCallerType) {
if (aRTPCallerType == RTPCallerType::SystemPrincipal) {
return DangerouslyNone;
}
if (aRTPCallerType == RTPCallerType::ResistFingerprinting) {
return RFP;
}
if (StaticPrefs::privacy_reduceTimerPrecision() &&
aRTPCallerType == RTPCallerType::CrossOriginIsolated) {
return UnconditionalAKAHighRes;
}
if (StaticPrefs::privacy_reduceTimerPrecision()) {
return Normal;
}
if (StaticPrefs::privacy_reduceTimerPrecision_unconditional()) {
return UnconditionalAKAHighRes;
}
return DangerouslyNone;
}
/* static */
TimerPrecisionType nsRFPService::GetTimerPrecisionTypeRFPOnly(
RTPCallerType aRTPCallerType) {
if (aRTPCallerType == RTPCallerType::ResistFingerprinting) {
return RFP;
}
if (StaticPrefs::privacy_reduceTimerPrecision_unconditional() &&
aRTPCallerType != RTPCallerType::SystemPrincipal) {
return UnconditionalAKAHighRes;
}
return DangerouslyNone;
}
/* static */
void nsRFPService::TypeToText(TimerPrecisionType aType, nsACString& aText) {
switch (aType) {
case TimerPrecisionType::DangerouslyNone:
aText.AssignLiteral("DangerouslyNone");
return;
case TimerPrecisionType::Normal:
aText.AssignLiteral("Normal");
return;
case TimerPrecisionType::RFP:
aText.AssignLiteral("RFP");
return;
case TimerPrecisionType::UnconditionalAKAHighRes:
aText.AssignLiteral("UnconditionalAKAHighRes");
return;
default:
MOZ_ASSERT(false, "Shouldn't go here");
aText.AssignLiteral("Unknown Enum Value");
return;
}
}
// ============================================================================
// ============================================================================
// ============================================================================
// Video Statistics Spoofing
/* static */
uint32_t nsRFPService::CalculateTargetVideoResolution(uint32_t aVideoQuality) {
return aVideoQuality * NSToIntCeil(aVideoQuality * 16 / 9.0);
@ -575,6 +817,11 @@ uint32_t nsRFPService::GetSpoofedPresentedFrames(double aTime, uint32_t aWidth,
((100 - boundedDroppedRatio) / 100.0));
}
// ============================================================================
// ============================================================================
// ============================================================================
// User-Agent/Version Stuff
static const char* GetSpoofedVersion() {
#ifdef ANDROID
// Return Desktop's ESR version.
@ -631,136 +878,47 @@ void nsRFPService::GetSpoofedUserAgent(nsACString& userAgent,
MOZ_ASSERT(userAgent.Length() <= preallocatedLength);
}
static const char* gCallbackPrefs[] = {
RESIST_FINGERPRINTING_PREF, RFP_TIMER_PREF,
RFP_TIMER_UNCONDITIONAL_PREF, RFP_TIMER_VALUE_PREF,
RFP_JITTER_VALUE_PREF, nullptr,
};
// ============================================================================
// ============================================================================
// ============================================================================
// Keyboard Spoofing Stuff
nsresult nsRFPService::Init() {
MOZ_ASSERT(NS_IsMainThread());
nsTHashMap<KeyboardHashKey, const SpoofingKeyboardCode*>*
nsRFPService::sSpoofingKeyboardCodes = nullptr;
nsresult rv;
KeyboardHashKey::KeyboardHashKey(const KeyboardLangs aLang,
const KeyboardRegions aRegion,
const KeyNameIndexType aKeyIdx,
const nsAString& aKey)
: mLang(aLang), mRegion(aRegion), mKeyIdx(aKeyIdx), mKey(aKey) {}
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
NS_ENSURE_TRUE(obs, NS_ERROR_NOT_AVAILABLE);
KeyboardHashKey::KeyboardHashKey(KeyTypePointer aOther)
: mLang(aOther->mLang),
mRegion(aOther->mRegion),
mKeyIdx(aOther->mKeyIdx),
mKey(aOther->mKey) {}
rv = obs->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
NS_ENSURE_SUCCESS(rv, rv);
KeyboardHashKey::KeyboardHashKey(KeyboardHashKey&& aOther) noexcept
: PLDHashEntryHdr(std::move(aOther)),
mLang(std::move(aOther.mLang)),
mRegion(std::move(aOther.mRegion)),
mKeyIdx(std::move(aOther.mKeyIdx)),
mKey(std::move(aOther.mKey)) {}
if (XRE_IsParentProcess()) {
rv = obs->AddObserver(this, LAST_PB_SESSION_EXITED_TOPIC, false);
NS_ENSURE_SUCCESS(rv, rv);
KeyboardHashKey::~KeyboardHashKey() = default;
rv = obs->AddObserver(this, OBSERVER_TOPIC_IDLE_DAILY, false);
NS_ENSURE_SUCCESS(rv, rv);
}
#if defined(XP_WIN)
rv = obs->AddObserver(this, PROFILE_INITIALIZED_TOPIC, false);
NS_ENSURE_SUCCESS(rv, rv);
#endif
Preferences::RegisterCallbacks(nsRFPService::PrefChanged, gCallbackPrefs,
this);
// We backup the original TZ value here.
const char* tzValue = PR_GetEnv("TZ");
if (tzValue != nullptr) {
mInitialTZValue = nsCString(tzValue);
}
// Call Update here to cache the values of the prefs and set the timezone.
UpdateRFPPref();
return rv;
bool KeyboardHashKey::KeyEquals(KeyTypePointer aOther) const {
return mLang == aOther->mLang && mRegion == aOther->mRegion &&
mKeyIdx == aOther->mKeyIdx && mKey == aOther->mKey;
}
// This function updates every fingerprinting item necessary except
// timing-related
void nsRFPService::UpdateRFPPref() {
MOZ_ASSERT(NS_IsMainThread());
bool resistFingerprinting = nsContentUtils::ShouldResistFingerprinting();
JS::SetReduceMicrosecondTimePrecisionCallback(
nsRFPService::ReduceTimePrecisionAsUSecsWrapper);
// set fdlibm pref
JS::SetUseFdlibmForSinCosTan(
StaticPrefs::javascript_options_use_fdlibm_for_sin_cos_tan() ||
resistFingerprinting);
// The JavaScript engine can already set the timezone per realm/global,
// but we think there are still other users of libc that rely
// on the TZ environment variable.
if (!StaticPrefs::privacy_resistFingerprinting_testing_setTZtoUTC()) {
return;
}
if (resistFingerprinting) {
PR_SetEnv("TZ=UTC");
} else if (sInitialized) {
// We will not touch the TZ value if 'privacy.resistFingerprinting' is false
// during the time of initialization.
if (!mInitialTZValue.IsEmpty()) {
nsAutoCString tzValue = "TZ="_ns + mInitialTZValue;
static char* tz = nullptr;
// If the tz has been set before, we free it first since it will be
// allocated a new value later.
if (tz != nullptr) {
free(tz);
}
// PR_SetEnv() needs the input string been leaked intentionally, so
// we copy it here.
tz = ToNewCString(tzValue, mozilla::fallible);
if (tz != nullptr) {
PR_SetEnv(tz);
}
} else {
#if defined(XP_WIN)
// For Windows, we reset the TZ to an empty string. This will make Windows
// to use its system timezone.
PR_SetEnv("TZ=");
#else
// For POSIX like system, we reset the TZ to the /etc/localtime, which is
// the system timezone.
PR_SetEnv("TZ=:/etc/localtime");
#endif
}
}
// If and only if the time zone was changed above, propagate the change to the
// <time.h> functions and the JS runtime.
if (resistFingerprinting || sInitialized) {
// localtime_r (and other functions) may not call tzset, so do this here
// after changing TZ to ensure all <time.h> functions use the new time zone.
#if defined(XP_WIN)
_tzset();
#else
tzset();
#endif
nsJSUtils::ResetTimeZone();
}
KeyboardHashKey::KeyTypePointer KeyboardHashKey::KeyToPointer(KeyType aKey) {
return &aKey;
}
void nsRFPService::StartShutdown() {
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
if (XRE_IsParentProcess()) {
obs->RemoveObserver(this, LAST_PB_SESSION_EXITED_TOPIC);
obs->RemoveObserver(this, OBSERVER_TOPIC_IDLE_DAILY);
}
}
Preferences::UnregisterCallbacks(nsRFPService::PrefChanged, gCallbackPrefs,
this);
PLDHashNumber KeyboardHashKey::HashKey(KeyTypePointer aKey) {
PLDHashNumber hash = mozilla::HashString(aKey->mKey);
return mozilla::AddToHash(hash, aKey->mRegion, aKey->mKeyIdx, aKey->mLang);
}
/* static */
@ -973,139 +1131,10 @@ bool nsRFPService::GetSpoofedKeyCode(const dom::Document* aDoc,
return false;
}
/* static */
TimerPrecisionType nsRFPService::GetTimerPrecisionType(
RTPCallerType aRTPCallerType) {
if (aRTPCallerType == RTPCallerType::SystemPrincipal) {
return DangerouslyNone;
}
if (aRTPCallerType == RTPCallerType::ResistFingerprinting) {
return RFP;
}
if (StaticPrefs::privacy_reduceTimerPrecision() &&
aRTPCallerType == RTPCallerType::CrossOriginIsolated) {
return UnconditionalAKAHighRes;
}
if (StaticPrefs::privacy_reduceTimerPrecision()) {
return Normal;
}
if (StaticPrefs::privacy_reduceTimerPrecision_unconditional()) {
return UnconditionalAKAHighRes;
}
return DangerouslyNone;
}
/* static */
TimerPrecisionType nsRFPService::GetTimerPrecisionTypeRFPOnly(
RTPCallerType aRTPCallerType) {
if (aRTPCallerType == RTPCallerType::ResistFingerprinting) {
return RFP;
}
if (StaticPrefs::privacy_reduceTimerPrecision_unconditional() &&
aRTPCallerType != RTPCallerType::SystemPrincipal) {
return UnconditionalAKAHighRes;
}
return DangerouslyNone;
}
/* static */
void nsRFPService::TypeToText(TimerPrecisionType aType, nsACString& aText) {
switch (aType) {
case TimerPrecisionType::DangerouslyNone:
aText.AssignLiteral("DangerouslyNone");
return;
case TimerPrecisionType::Normal:
aText.AssignLiteral("Normal");
return;
case TimerPrecisionType::RFP:
aText.AssignLiteral("RFP");
return;
case TimerPrecisionType::UnconditionalAKAHighRes:
aText.AssignLiteral("UnconditionalAKAHighRes");
return;
default:
MOZ_ASSERT(false, "Shouldn't go here");
aText.AssignLiteral("Unknown Enum Value");
return;
}
}
// static
void nsRFPService::PrefChanged(const char* aPref, void* aSelf) {
static_cast<nsRFPService*>(aSelf)->PrefChanged(aPref);
}
void nsRFPService::PrefChanged(const char* aPref) {
nsDependentCString pref(aPref);
if (pref.EqualsLiteral(RESIST_FINGERPRINTING_PREF)) {
UpdateRFPPref();
#if defined(XP_WIN)
if (!XRE_IsE10sParentProcess()) {
// Windows does not follow POSIX. Updates to the TZ environment variable
// are not reflected immediately on that platform as they are on UNIX
// systems without this call.
_tzset();
}
#endif
}
}
NS_IMETHODIMP
nsRFPService::Observe(nsISupports* aObject, const char* aTopic,
const char16_t* aMessage) {
if (strcmp(NS_XPCOM_SHUTDOWN_OBSERVER_ID, aTopic) == 0) {
StartShutdown();
}
#if defined(XP_WIN)
else if (!strcmp(PROFILE_INITIALIZED_TOPIC, aTopic)) {
// If we're e10s, then we don't need to run this, since the child process
// will simply inherit the environment variable from the parent process, in
// which case it's unnecessary to call _tzset().
if (XRE_IsParentProcess() && !XRE_IsE10sParentProcess()) {
// Windows does not follow POSIX. Updates to the TZ environment variable
// are not reflected immediately on that platform as they are on UNIX
// systems without this call.
_tzset();
}
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
NS_ENSURE_TRUE(obs, NS_ERROR_NOT_AVAILABLE);
nsresult rv = obs->RemoveObserver(this, PROFILE_INITIALIZED_TOPIC);
NS_ENSURE_SUCCESS(rv, rv);
}
#endif
if (strcmp(LAST_PB_SESSION_EXITED_TOPIC, aTopic) == 0) {
// Clear the private session key when the private session ends so that we
// can generate a new key for the new private session.
ClearSessionKey(true);
}
if (!strcmp(OBSERVER_TOPIC_IDLE_DAILY, aTopic)) {
if (StaticPrefs::
privacy_resistFingerprinting_randomization_daily_reset_enabled()) {
ClearSessionKey(false);
}
if (StaticPrefs::
privacy_resistFingerprinting_randomization_daily_reset_private_enabled()) {
ClearSessionKey(true);
}
}
return NS_OK;
}
// ============================================================================
// ============================================================================
// ============================================================================
// Randomization Stuff
nsresult nsRFPService::EnsureSessionKey(bool aIsPrivate) {
MOZ_ASSERT(XRE_IsParentProcess());

28
toolkit/components/resistfingerprinting/nsRFPService.h
Просмотреть файл

@ -106,7 +106,7 @@ class KeyboardHashKey : public PLDHashEntryHdr {
explicit KeyboardHashKey(KeyTypePointer aOther);
KeyboardHashKey(KeyboardHashKey&& aOther);
KeyboardHashKey(KeyboardHashKey&& aOther) noexcept;
~KeyboardHashKey();
@ -124,6 +124,8 @@ class KeyboardHashKey : public PLDHashEntryHdr {
nsString mKey;
};
// ============================================================================
enum TimerPrecisionType {
DangerouslyNone = 1,
UnconditionalAKAHighRes = 2,
@ -131,12 +133,16 @@ enum TimerPrecisionType {
RFP = 4,
};
// ============================================================================
class nsRFPService final : public nsIObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
static nsRFPService* GetOrCreate();
// --------------------------------------------------------------------------
static double TimerResolution(RTPCallerType aRTPCallerType);
enum TimeScale { Seconds = 1, MilliSeconds = 1000, MicroSeconds = 1000000 };
@ -169,6 +175,8 @@ class nsRFPService final : public nsIObserver {
int64_t aContextMixin, long long* aMidpointOut,
uint8_t* aSecretSeed = nullptr);
// --------------------------------------------------------------------------
// This method calculates the video resolution (i.e. height x width) based
// on the video quality (480p, 720p, etc).
static uint32_t CalculateTargetVideoResolution(uint32_t aVideoQuality);
@ -181,9 +189,13 @@ class nsRFPService final : public nsIObserver {
static uint32_t GetSpoofedPresentedFrames(double aTime, uint32_t aWidth,
uint32_t aHeight);
// --------------------------------------------------------------------------
// This method generates the spoofed value of User Agent.
static void GetSpoofedUserAgent(nsACString& userAgent, bool isForHTTPHeader);
// --------------------------------------------------------------------------
/**
* This method for getting spoofed modifier states for the given keyboard
* event.
@ -228,11 +240,15 @@ class nsRFPService final : public nsIObserver {
const WidgetKeyboardEvent* aKeyboardEvent,
uint32_t& aOut);
// --------------------------------------------------------------------------
// The method to generate the key for randomization. It can return nothing if
// the session key is not available due to the randomization is disabled.
static Maybe<nsTArray<uint8_t>> GenerateKey(nsIURI* aTopLevelURI,
bool aIsPrivate);
// --------------------------------------------------------------------------
private:
nsresult Init();
@ -240,12 +256,16 @@ class nsRFPService final : public nsIObserver {
~nsRFPService() = default;
nsCString mInitialTZValue;
void UpdateRFPPref();
void StartShutdown();
void PrefChanged(const char* aPref);
static void PrefChanged(const char* aPref, void* aSelf);
// --------------------------------------------------------------------------
static void MaybeCreateSpoofingKeyCodes(const KeyboardLangs aLang,
const KeyboardRegions aRegion);
static void MaybeCreateSpoofingKeyCodesForEnUS();
@ -260,6 +280,8 @@ class nsRFPService final : public nsIObserver {
static nsTHashMap<KeyboardHashKey, const SpoofingKeyboardCode*>*
sSpoofingKeyboardCodes;
// --------------------------------------------------------------------------
static TimerPrecisionType GetTimerPrecisionType(RTPCallerType aRTPCallerType);
static TimerPrecisionType GetTimerPrecisionTypeRFPOnly(
@ -267,12 +289,12 @@ class nsRFPService final : public nsIObserver {
static void TypeToText(TimerPrecisionType aType, nsACString& aText);
// --------------------------------------------------------------------------
// Generate the session key if it hasn't been generated.
nsresult EnsureSessionKey(bool aIsPrivate);
void ClearSessionKey(bool aIsPrivate);
nsCString mInitialTZValue;
// The keys that represent the browsing session. The lifetime of the key ties
// to the browsing session. For normal windows, the key is generated when
// loading the first http channel after the browser startup and persists until