[VPN 2.0] Finalize extraction of BraveVpnService V1 implementation (#36851)

To add a new BraveVpnService implementation based on Architecture 2.0,
which must co-exist with Architecture 1.0 for quite a while, we need
to split service's interface and implementation. All the external
components will keep accessing VPN service via the BraveVpnService
interface, but the implementation mostly goes into BraveVpnServiceImpl.

This change finalizes the BraveVpnService Architecture 1.0 extraction
based on GN flags. It also splits "components/brave_vpn/browser"
targets in the BUILD.gn into two targets - a shared one and a V1
specific one. The factory is prepared to create different service
implementations, and the V1 tests are ensured to run only when
V1 architecture is enabled by a GN flag.

Implements part of https://github.com/brave/brave-browser/issues/54597

BUILD.gn

@@ -3,8 +3,6 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this file,
 # You can obtain one at https://mozilla.org/MPL/2.0/.
 
-import(
-    "//brave/browser/brave_vpn/win/brave_vpn_wireguard_service/allowlist.gni")
 import("//brave/build/config.gni")
 import("//brave/build/redirect_cc.gni")
 import("//brave/components/brave_vpn/common/buildflags/buildflags.gni")
@@ -20,6 +18,11 @@ import("//tools/grit/repack.gni")
 import("//tools/v8_context_snapshot/v8_context_snapshot.gni")
 import("//ui/base/ui_features.gni")
 
+if (enable_brave_vpn_v1) {
+  import(
+      "//brave/browser/brave_vpn/win/brave_vpn_wireguard_service/allowlist.gni")
+}
+
 if (enable_library_cdms) {
   import("//media/cdm/library_cdm/cdm_paths.gni")
 }
@@ -771,7 +774,7 @@ if (is_win && enable_resource_allowlist_generation) {
   # Merge chrome_resource_allowlist and wireguard resources allowlist to keep
   # wireguard resources in pak files. When VPN is disabled, just copy the chrome
   # allowlist.
-  if (enable_brave_vpn) {
+  if (enable_brave_vpn_v1) {
     action("merge_allowlists") {
       deps = [
         "//brave/browser/brave_vpn/win/brave_vpn_wireguard_service:wireguard_resource_allowlist",

browser/brave_vpn/brave_vpn_service_factory.cc

@@ -9,14 +9,15 @@
 
 #include "base/feature_list.h"
 #include "base/no_destructor.h"
+#include "base/notreached.h"
 #include "brave/browser/brave_browser_process.h"
 #include "brave/browser/brave_vpn/vpn_utils.h"
 #include "brave/browser/misc_metrics/process_misc_metrics.h"
 #include "brave/browser/misc_metrics/uptime_monitor_impl.h"
 #include "brave/browser/skus/skus_service_factory.h"
 #include "brave/components/brave_vpn/browser/brave_vpn_service.h"
-#include "brave/components/brave_vpn/browser/brave_vpn_service_impl.h"
 #include "brave/components/brave_vpn/common/brave_vpn_utils.h"
+#include "brave/components/brave_vpn/common/buildflags/buildflags.h"
 #include "brave/components/skus/common/features.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
@@ -27,23 +28,24 @@
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/storage_partition.h"
 
+#if BUILDFLAG(ENABLE_BRAVE_VPN_V1)
+#include "brave/components/brave_vpn/browser/brave_vpn_service_impl.h"
 #if BUILDFLAG(IS_WIN)
 #include "brave/browser/brave_vpn/dns/brave_vpn_dns_observer_factory_win.h"
 #include "brave/browser/brave_vpn/dns/brave_vpn_dns_observer_service_win.h"
 #include "brave/browser/brave_vpn/win/brave_vpn_service_delegate_win.h"
 #include "brave/browser/brave_vpn/win/brave_vpn_wireguard_observer_factory_win.h"
 #include "brave/browser/brave_vpn/win/brave_vpn_wireguard_observer_service_win.h"
-#endif
+#endif  // IS_WIN
+#endif  // ENABLE_BRAVE_VPN_V1
 
 namespace brave_vpn {
 namespace {
 
-std::unique_ptr<KeyedService> BuildVpnService(
-    content::BrowserContext* context) {
-  if (!brave_vpn::IsAllowedForContext(context)) {
-    return nullptr;
-  }
+#if BUILDFLAG(ENABLE_BRAVE_VPN_V1)
 
+std::unique_ptr<KeyedService> BuildVpnService_V1(
+    content::BrowserContext* context) {
 #if !BUILDFLAG(IS_ANDROID)
   if (!g_brave_browser_process->brave_vpn_connection_manager()) {
     return nullptr;
@@ -93,6 +95,20 @@ std::unique_ptr<KeyedService> BuildVpnService(
   return vpn_service;
 }
 
+#endif  // BUILDFLAG(ENABLE_BRAVE_VPN_V1)
+
+std::unique_ptr<KeyedService> BuildVpnService(
+    content::BrowserContext* context) {
+  if (!brave_vpn::IsAllowedForContext(context)) {
+    return nullptr;
+  }
+#if BUILDFLAG(ENABLE_BRAVE_VPN_V1)
+  return BuildVpnService_V1(context);
+#else
+  NOTREACHED() << "No VPN implementation available";
+#endif
+}
+
 }  // namespace
 
 // static
@@ -138,10 +154,10 @@ BraveVpnServiceFactory::BraveVpnServiceFactory()
           "BraveVpnService",
           BrowserContextDependencyManager::GetInstance()) {
   DependsOn(skus::SkusServiceFactory::GetInstance());
-#if BUILDFLAG(IS_WIN)
+#if BUILDFLAG(ENABLE_BRAVE_VPN_V1) && BUILDFLAG(IS_WIN)
   DependsOn(brave_vpn::BraveVpnWireguardObserverFactory::GetInstance());
   DependsOn(brave_vpn::BraveVpnDnsObserverFactory::GetInstance());
-#endif
+#endif  // BUILDFLAG(ENABLE_BRAVE_VPN_V1) && BUILDFLAG(IS_WIN)
 }
 
 BraveVpnServiceFactory::~BraveVpnServiceFactory() = default;

browser/brave_vpn/sources.gni

@@ -13,7 +13,31 @@ if (enable_brave_vpn) {
     "//brave/browser/brave_vpn/brave_vpn_service_factory.cc",
     "//brave/browser/brave_vpn/brave_vpn_service_factory.h",
   ]
+  brave_browser_brave_vpn_deps += [
+    "//base",
+    "//brave/browser/brave_vpn",
+    "//brave/components/brave_vpn/browser",
+    "//chrome/browser/profiles:profile",
+    "//components/keyed_service/content",
+    "//components/user_prefs",
+    "//content/public/browser",
+  ]
 
+  if (is_android) {
+    brave_browser_brave_vpn_sources += [
+      "//brave/browser/brave_vpn/android/brave_vpn_native_worker.cc",
+      "//brave/browser/brave_vpn/android/brave_vpn_native_worker.h",
+      "//brave/browser/brave_vpn/android/brave_vpn_service_factory_android.cc",
+    ]
+    brave_browser_brave_vpn_deps += [
+      "//brave/build/android:jni_headers",
+      "//brave/components/l10n/common",
+      "//mojo/public/cpp/bindings",
+    ]
+  }
+}
+
+if (enable_brave_vpn_v1) {
   if (is_win) {
     brave_browser_brave_vpn_sources += [
       "//brave/browser/brave_vpn/dns/brave_vpn_dns_observer_factory_win.cc",
@@ -40,26 +64,7 @@ if (enable_brave_vpn) {
   }
 
   brave_browser_brave_vpn_deps += [
-    "//base",
-    "//brave/browser/brave_vpn",
     "//brave/browser/brave_vpn:v1_utils",
-    "//brave/components/brave_vpn/browser",
-    "//chrome/browser/profiles:profile",
-    "//components/keyed_service/content",
-    "//components/user_prefs",
-    "//content/public/browser",
+    "//brave/components/brave_vpn/browser:v1_utils",
   ]
-
-  if (is_android) {
-    brave_browser_brave_vpn_sources += [
-      "//brave/browser/brave_vpn/android/brave_vpn_native_worker.cc",
-      "//brave/browser/brave_vpn/android/brave_vpn_native_worker.h",
-      "//brave/browser/brave_vpn/android/brave_vpn_service_factory_android.cc",
-    ]
-    brave_browser_brave_vpn_deps += [
-      "//brave/build/android:jni_headers",
-      "//brave/components/l10n/common",
-      "//mojo/public/cpp/bindings",
-    ]
-  }
 }

browser/brave_vpn/win/BUILD.gn

@@ -39,6 +39,7 @@ source_set("win") {
     ":wireguard_utils",
     "//base",
     "//brave/components/brave_vpn/browser",
+    "//brave/components/brave_vpn/browser:v1_utils",
     "//brave/components/brave_vpn/browser/connection/wireguard",
     "//brave/components/brave_vpn/browser/connection/wireguard/credentials",
     "//brave/components/brave_vpn/common",

browser/sources.gni

@@ -546,13 +546,11 @@ if (enable_web_discovery_native) {
 if (enable_brave_vpn) {
   brave_chrome_browser_deps += [
     "//brave/components/brave_vpn/browser",
+    "//brave/components/brave_vpn/browser:v1_utils",
+    "//brave/components/brave_vpn/browser/connection",
     "//brave/components/brave_vpn/browser/connection:api",
     "//brave/components/brave_vpn/common",
   ]
-  if (enable_brave_vpn_v1) {
-    brave_chrome_browser_deps +=
-        [ "//brave/components/brave_vpn/browser/connection" ]
-  }
 }
 
 if (enable_brave_vpn_v2) {

browser/ui/BUILD.gn

@@ -985,10 +985,12 @@ source_set("ui") {
     deps += [
       "//brave/browser/brave_vpn",
       "//brave/components/brave_vpn/browser",
-      "//brave/components/brave_vpn/browser/connection:api",
       "//brave/components/brave_vpn/common",
     ]
-    if (enable_brave_vpn_v1 && is_win) {
+  }
+  if (enable_brave_vpn_v1) {
+    deps += [ "//brave/components/brave_vpn/browser/connection:api" ]
+    if (is_win) {
       deps += [
         "//brave/components/brave_vpn/common/win",
         "//brave/components/brave_vpn/common/wireguard",
@@ -1491,8 +1493,6 @@ source_set("unit_tests") {
       deps += [
         "//base",
         "//brave/components/brave_vpn/browser",
-        "//brave/components/brave_vpn/browser/connection:api",
-        "//brave/components/brave_vpn/browser/connection/ikev2:sim",
         "//brave/components/skus/browser",
         "//chrome/browser/prefs",
         "//chrome/browser/themes",
@@ -1501,6 +1501,12 @@ source_set("unit_tests") {
         "//third_party/abseil-cpp:absl",
       ]
     }
+    if (enable_brave_vpn_v1) {
+      deps += [
+        "//brave/components/brave_vpn/browser/connection:api",
+        "//brave/components/brave_vpn/browser/connection/ikev2:sim",
+      ]
+    }
   }
 }
 

chromium_src/chrome/installer/setup/test/BUILD.gn

@@ -5,7 +5,7 @@
 
 import("//brave/components/brave_vpn/common/buildflags/buildflags.gni")
 
-if (enable_brave_vpn && is_win) {
+if (enable_brave_vpn_v1 && is_win) {
   source_set("vpn_unit_tests") {
     testonly = true
     sources = [ "install_worker_vpn_unittest.cc" ]

chromium_src/chrome/test/sources.gni

@@ -26,7 +26,7 @@ if (enable_ai_chat) {
       [ "//brave/components/ai_chat/core/browser:test_support" ]
 }
 
-if (enable_brave_vpn) {
+if (enable_brave_vpn_v1) {
   brave_chromium_src_chrome_test_test_support_deps +=
       [ "//brave/components/brave_vpn/browser/connection:api" ]
 }

components/brave_vpn/browser/BUILD.gn

@@ -7,43 +7,63 @@ import("//brave/components/brave_vpn/common/buildflags/buildflags.gni")
 
 assert(enable_brave_vpn)
 
+# Browser sources shared between v1 and v2 implementations.
 static_library("browser") {
+  sources = [
+    "brave_vpn_service.cc",
+    "brave_vpn_service.h",
+    "brave_vpn_service_observer.cc",
+    "brave_vpn_service_observer.h",
+  ]
+
+  public_deps = [
+    "//base",
+    "//brave/components/brave_vpn/common/mojom",
+    "//brave/components/skus/browser",
+    "//components/keyed_service/core",
+    "//mojo/public/cpp/bindings",
+  ]
+
+  deps = [ "//brave/components/brave_vpn/common" ]
+}
+
+static_library("v1_utils") {
   sources = [
     "brave_vpn_metrics.cc",
     "brave_vpn_metrics.h",
-    "brave_vpn_service.cc",
-    "brave_vpn_service.h",
     "brave_vpn_service_delegate.h",
     "brave_vpn_service_helper.cc",
     "brave_vpn_service_helper.h",
     "brave_vpn_service_impl.cc",
     "brave_vpn_service_impl.h",
-    "brave_vpn_service_observer.cc",
-    "brave_vpn_service_observer.h",
   ]
 
-  deps = [
+  public_deps = [
+    ":browser",
     "api",
-    "connection",
     "connection:api",
-    "connection:common",
     "//base",
     "//brave/components/brave_vpn/common",
     "//brave/components/brave_vpn/common/mojom",
-    "//brave/components/constants",
     "//brave/components/misc_metrics",
-    "//brave/components/p3a_utils",
-    "//brave/components/resources:strings",
     "//brave/components/skus/browser",
     "//brave/components/skus/common:mojom",
     "//brave/components/time_period_storage",
-    "//brave/components/version_info",
     "//build:buildflag_header_h",
-    "//components/keyed_service/core",
-    "//components/pref_registry",
     "//components/prefs",
-    "//components/version_info",
+    "//mojo/public/cpp/bindings",
     "//services/network/public/cpp",
+  ]
+
+  deps = [
+    "connection",
+    "connection:common",
+    "//brave/components/constants",
+    "//brave/components/p3a_utils",
+    "//brave/components/resources:strings",
+    "//brave/components/version_info",
+    "//components/pref_registry",
+    "//components/version_info",
     "//ui/base",
     "//url",
   ]
@@ -52,20 +72,18 @@ static_library("browser") {
 source_set("unit_tests") {
   testonly = true
 
-  sources = [
+  sources = [ "brave_vpn_service_unittest.cc" ]
+
+  if (enable_brave_vpn_v1) {
+    sources += [
       "brave_vpn_metrics_unittest.cc",
       "brave_vpn_service_impl_unittest.cc",
-    "brave_vpn_service_unittest.cc",
     ]
+  }
 
   deps = [
     ":browser",
-    "api",
-    "api:unit_tests",
     "//base",
-    "//brave/components/brave_vpn/browser/connection:api",
-    "//brave/components/brave_vpn/browser/connection:common",
-    "//brave/components/brave_vpn/browser/connection/wireguard/credentials:unit_tests",
     "//brave/components/brave_vpn/common",
     "//brave/components/brave_vpn/common/mojom",
     "//brave/components/constants",
@@ -80,10 +98,22 @@ source_set("unit_tests") {
     "//testing/gmock",
     "//testing/gtest",
   ]
+
+  if (enable_brave_vpn_v1) {
+    deps += [
+      ":v1_utils",
+      "api",
+      "api:unit_tests",
+      "//brave/components/brave_vpn/browser/connection:api",
+      "//brave/components/brave_vpn/browser/connection:common",
+      "//brave/components/brave_vpn/browser/connection/wireguard/credentials:unit_tests",
+    ]
+
     if (!is_android) {
       deps += [
         "connection:unit_tests",
         "//brave/components/brave_vpn/browser/connection/ikev2:sim",
       ]
     }
+  }
 }

components/brave_vpn/browser/connection/ikev2/BUILD.gn

@@ -51,7 +51,7 @@ source_set("unit_tests") {
 
   deps = [
     ":sim",
-    "//brave/components/brave_vpn/browser",
+    "//brave/components/brave_vpn/browser:v1_utils",
     "//brave/components/brave_vpn/browser/connection:api",
     "//brave/components/brave_vpn/browser/connection:common",
     "//brave/components/brave_vpn/common",

test/BUILD.gn

@@ -416,9 +416,11 @@ test("brave_unit_tests") {
     deps += [
       "//brave/components/brave_vpn/browser:unit_tests",
       "//brave/components/brave_vpn/common:unit_tests",
-      "//brave/components/brave_vpn/common/wireguard:unit_tests",
       "//brave/components/skus/browser:unit_tests",
     ]
+  }
+  if (enable_brave_vpn_v1) {
+    deps += [ "//brave/components/brave_vpn/common/wireguard:unit_tests" ]
     if (is_win) {
       deps += [
         "//brave/browser/brave_vpn/dns:unit_tests",
@@ -713,7 +715,7 @@ if (!is_android) {
         "//testing/gtest",
       ]
 
-      if (enable_brave_vpn) {
+      if (enable_brave_vpn_v1) {
         deps += [
           "//brave/chromium_src/chrome/installer/setup/test:vpn_unit_tests",
         ]