Add flag for referrer header directive (ungoogled-software#1949)

* Add flag for referrer header directive

* Update add-flag-for-referrer-header.patch for version 102.0.5005.61

Co-authored-by: networkException <[email protected]>

docs/flags.md

@@ -22,6 +22,7 @@ If a switch requires a value, you must specify it with an `=` sign; e.g. flag `-
  `--max-connections-per-host` | (from Bromite) Configure the maximum allowed connections per host. Valid values are `6` and `15`
  `--omnibox-autocomplete-filtering` | Restrict omnibox autocomplete results to a combination of search suggestions (if enabled), bookmarks, and internal chrome pages. Accepts `search`, `search-bookmarks`, `search-chrome`, and `search-bookmarks-chrome`.
  `--popups-to-tabs` | Makes popups open in new tabs.
+ `--referrer-directive` | Allows setting a custom directive for referrer headers. Accepts `nocrossorigin`, `minimal`, and `noreferrers`. The no cross-origin referrer option removes all cross-origin referrers, the minimal option removes all cross-origin referrers and strips same-origin referrers down to the origin, and the no referrers option removes all referrers.
 
 - ### Available only on desktop
 

patches/extra/ungoogled-chromium/add-flag-for-referrer-header.patch

@@ -0,0 +1,66 @@
+--- a/chrome/browser/ungoogled_flag_choices.h
++++ b/chrome/browser/ungoogled_flag_choices.h
+@@ -79,4 +79,16 @@ const FeatureEntry::Choice kTabHoverCard
+ "tab-hover-cards",
+ "tooltip"},
+ };
++const FeatureEntry::Choice kReferrerDirective[] = {
++ {flags_ui::kGenericExperimentChoiceDefault, "", ""},
++ {"No cross-origin referrer",
++ "referrer-directive",
++ "nocrossorigin"},
++ {"Minimal referrer",
++ "referrer-directive",
++ "minimal"},
++ {"No referrers",
++ "referrer-directive",
++ "noreferrers"},
++};
+ #endif // CHROME_BROWSER_UNGOOGLED_FLAG_CHOICES_H_
+--- a/chrome/browser/ungoogled_flag_entries.h
++++ b/chrome/browser/ungoogled_flag_entries.h
+@@ -88,4 +88,8 @@
+ "Hide tab close buttons",
+ "Hides the close buttons on tabs. ungoogled-chromium flag.",
+ kOsDesktop, SINGLE_VALUE_TYPE("hide-tab-close-buttons")},
++ {"referrer-directive",
++ "Referrer directive",
++ "Allows setting a custom directive for referrer headers. The no cross-origin referrer option removes all cross-origin referrers, the minimal option removes all cross-origin referrers and strips same-origin referrers down to the origin, and the no referrers option removes all referrers. ungoogled-chromium flag.",
++ kOsAll, MULTI_VALUE_TYPE(kReferrerDirective)},
+ #endif // CHROME_BROWSER_UNGOOGLED_FLAG_ENTRIES_H_
+--- a/content/browser/utility_process_host.cc
++++ b/content/browser/utility_process_host.cc
+@@ -225,6 +225,7 @@ bool UtilityProcessHost::StartProcess()
+
+ // Browser command-line switches to propagate to the utility process.
+ static const char* const kSwitchNames[] = {
++ "referrer-directive",
+ network::switches::kAdditionalTrustTokenKeyCommitments,
+ network::switches::kForceEffectiveConnectionType,
+ network::switches::kHostResolverRules,
+--- a/services/network/network_service_network_delegate.cc
++++ b/services/network/network_service_network_delegate.cc
+@@ -7,6 +7,7 @@
+ #include <string>
+
+ #include "base/bind.h"
++#include "base/command_line.h"
+ #include "base/debug/dump_without_crashing.h"
+ #include "base/strings/utf_string_conversions.h"
+ #include "build/build_config.h"
+@@ -62,6 +63,15 @@ void NetworkServiceNetworkDelegate::Mayb
+ return;
+ }
+
++ if (base::CommandLine::ForCurrentProcess()->HasSwitch("referrer-directive")) {
++ std::string option = base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII("referrer-directive");
++ if (!url::IsSameOriginWith(effective_url, GURL(request->referrer())) || option == "noreferrers")
++ request->SetReferrer(std::string());
++ if (option == "minimal")
++ request->SetReferrer(url::Origin::Create(GURL(request->referrer())).GetURL().spec());
++ return;
++ }
++
+ if (base::FeatureList::IsEnabled(
+ net::features::kCapReferrerToOriginOnCrossOrigin)) {
+ if (!url::IsSameOriginWith(effective_url, GURL(request->referrer()))) {

patches/series

@@ -93,6 +93,7 @@ extra/ungoogled-chromium/add-flag-for-custom-ntp.patch
 extra/ungoogled-chromium/add-flag-for-tab-hover-cards.patch
 extra/ungoogled-chromium/add-flag-to-hide-tab-close-buttons.patch
 extra/ungoogled-chromium/disable-remote-optimization-guide.patch
+extra/ungoogled-chromium/add-flag-for-referrer-header.patch
 extra/bromite/fingerprinting-flags-client-rects-and-measuretext.patch
 extra/bromite/flag-max-connections-per-host.patch
 extra/bromite/flag-fingerprinting-canvas-image-data-noise.patch