Clearing data from "Clear Browsing Data"

[uazo]

• check why some information is deleted only by deleting the navigation history: users who do not delete browsing history (like me) also keep other information (detail which ones and whether they are exploitable by websites)
• check if localstorage is ephemeral with session-only cookies setting (flag which can be enabled in windows but not in android)
• make a patch similar to add-flag-to-clear-data-on-exit.patch with ui, maybe even for android

[uazo]

things deleted only with DATA_TYPE_HISTORY

• language::UrlLanguageHistogram Collects data about languages in which the user reads the web and provides access to current estimated language preferences. Send via json request in ntp snippets (disabled by default)

• extensions::ActivityLog Tracing interesting activity for each extension. exposed via ActivityLogAPI, active under "--enable-extension-activity-logging" command line flag intresting!

• extension_prefs->ClearLastLaunchTimes(); record launch time of an extension used in AppService

• HostCache (see NetworkContext::ClearHostCache) Clear the host cache on networkcontext (net.host_cache in prefs) Used only in cronet

• NoStatePrefetchManager NoStatePrefetchManager is responsible for initiating and keeping prerendered views of web pages. see NoStatePrefetchManager::IsPredictionEnabled(Origin origin) // and origins ignore the network state // and the privacy // settings. Web developers should be able prefetch with all possible privacy // settings. This would avoid web devs coming up with creative ways to // prefetch in cases they are not allowed to do so. seems to be blocked if ThirdParty Cookies are disabled or device is a low end. need some checks.

• AutofillWebDataService Record origin URLs associated with Autofill profiles and credit cards. DB name "Web Data" https://source.chromium.org/chromium/chromium/src/+/main:components/webdata/common/webdata_constants.cc; check CreditCardSaveManager::IsCreditCardUploadEnabled() and kAutofillWalletImportEnabled

• OldAndRecentWebRtcLogFiles

• WebappHistory

• customtabs::ChromeOriginVerifier for digital-asset-links (https://developers.google.com/digital-asset-links/v1/getting-started) see https://source.chromium.org/chromium/chromium/src/+/main:components/digital_asset_links/digital_asset_links_handler.cc;l=295;drc=4ced8912f6c8b32715984dd81e3f376a260ebab6;bpv=1;bpt=1

• HeavyAdService

• OptimizationGuideKeyedService

• PrefetchProxyService

• PrefetchServiceDelegate

• OomInterventionDecider

• SSLHostState (tracks SSL interstitial "proceed")

• VideoDecodePerfHistory and WebrtcVideoPerfHistory exposed via navigator.mediaCapabilities.decodingInfo() "supported" if false is real and can be used for fingerprint.

• device_event_log view with chrome://device-log used in FeedbackService::SendFeedback() check https://source.chromium.org/chromium/chromium/src/+/main:extensions/browser/api/feedback_private/feedback_service.cc;l=98;drc=4ced8912f6c8b32715984dd81e3f376a260ebab6;bpv=1;bpt=1

• ExploreSitesService disabled

• CreateCrashUploadList

• LastSearchText Clear find text in page

• ShareHistory and ShareRanking Need to be disabled in windows as it may download image from opengraph page data

• ClearLastUsedTimeInRange in bookmark

• RemoveFederatedSiteSettingsData

[uazo]

test patch done:

Windows version

Android version

[uazo]

wip patch https://github.com/uazo/bromite/blob/2212b173db4294c03e565f996f6ba4dab8de8aba/build/patches/00Add-setting-to-clear-data-on-exit.patch

[uazo]

the patch inserts an ui for a feature that is currently active and managed by policy (and activates support in android). for now the data is saved to disk and deleted when closing (windows) or opening (android) the browser.

next steps:

• move to a db in memory for that data information
• search for all of the above information as it is handled in anonymous navigation and bring it into normal navigation
• check that other disk caches (e.g. javascript cache or cpu cache) are cleared
• check why favicon cache is not cleared
• merge 'Clear CORS Preflight Cache on clearing data' patch

issue:

• in windows remove the "Clear data" button in the new panel

[uazo]

check also https://source.chromium.org/chromium/chromium/src/+/main:services/network/public/mojom/network_context.mojom;l=916;drc=15fc570ec23e16389c5349f9d0bd405a9af95575

EDIT: checked, already cleared

[uazo]

check the storage deletion of getUniqueId() storage

[uazo]

see also https://bugs.chromium.org/p/chromium/issues/detail?id=1464260 and https://bugs.chromium.org/p/chromium/issues/detail?id=1458394

[uazo]

add cleaning of the Favicons database

[Universalizer]

add cleaning of the Favicons database

Thank You Very Much.