Expose way for sites to determine if browser is Brave

Fixes brave/brave-browser#8216

build/config/brave_build.gni

@@ -4,3 +4,4 @@
 import("//brave/brave_repack_locales.gni")
 import("//brave/build/features.gni")
 import("//brave/net/sources.gni")
+import("//brave/third_party/blink/renderer/includes.gni")

patches/third_party-blink-renderer-core-BUILD.gn.patch

@@ -1,12 +1,20 @@
 diff --git a/third_party/blink/renderer/core/BUILD.gn b/third_party/blink/renderer/core/BUILD.gn
-index 1c2e3e6e2872729dace5c1582ffe596aadcf1e52..5711edbdac5549f94e184b74ae97d9d2f968cea8 100644
+index 1c2e3e6e2872729dace5c1582ffe596aadcf1e52..a1bca85a0fa514dd6a17d7717cec72e4bbc5ca71 100644
 --- a/third_party/blink/renderer/core/BUILD.gn
 +++ b/third_party/blink/renderer/core/BUILD.gn
-@@ -214,6 +214,7 @@ component("core") {
+@@ -143,6 +143,7 @@ component("core") {
+
+   visibility = []  # Allow re-assignment of list.
+   visibility = [ "//third_party/blink/*" ]
++  visibility += brave_blink_renderer_core_visibility
+
+   # If you create a new subdirectory, make a new BUILD file for that directory
+   # and reference it in the deps below rather than adding the sources here.
+@@ -214,6 +215,7 @@ component("core") {
      "//url",
      "//v8",
    ]
-+  public_deps += [ "//brave/third_party/blink/renderer" ]
++  public_deps += brave_blink_renderer_core_public_deps
    deps = [
      "//third_party/blink/public/common",
      "//third_party/blink/renderer/platform",

patches/third_party-blink-renderer-modules-BUILD.gn.patch

@@ -0,0 +1,20 @@
+diff --git a/third_party/blink/renderer/modules/BUILD.gn b/third_party/blink/renderer/modules/BUILD.gn
+index 0f0b26ea466715b40326179e5b1f57005e00a3f9..a53b72af790baa64cf7c18783af7296a837db490 100644
+--- a/third_party/blink/renderer/modules/BUILD.gn
++++ b/third_party/blink/renderer/modules/BUILD.gn
+@@ -16,6 +16,7 @@ if (is_android) {
+ }
+
+ visibility = [ "//third_party/blink/renderer/*" ]
++visibility += brave_blink_renderer_modules_visibility
+
+ config("modules_implementation") {
+   defines = [ "BLINK_MODULES_IMPLEMENTATION=1" ]
+@@ -155,6 +156,7 @@ jumbo_component("modules") {
+     "//third_party/blink/renderer/modules/xr",
+   ]
+
++  sub_modules += brave_blink_sub_modules
+   deps = [
+     ":make_modules_generated",
+     ":module_names",

patches/third_party-blink-renderer-modules-modules_idl_files.gni.patch

@@ -0,0 +1,20 @@
+diff --git a/third_party/blink/renderer/modules/modules_idl_files.gni b/third_party/blink/renderer/modules/modules_idl_files.gni
+index 1bb5f1a07397e4f5c2cac8388a96976c12e21787..81919dea27f8c21e45285f1911407a0ee6228445 100644
+--- a/third_party/blink/renderer/modules/modules_idl_files.gni
++++ b/third_party/blink/renderer/modules/modules_idl_files.gni
+@@ -543,6 +543,7 @@ modules_idl_files =
+         ],
+         "abspath")
+
++modules_idl_files += brave_modules_idl_files
+ if (!is_android) {
+   modules_idl_files += get_path_info([
+                                        "serial/serial.idl",
+@@ -1030,6 +1031,7 @@ modules_dependency_idl_files =
+           "xr/navigator_xr.idl",
+         ],
+         "abspath")
++modules_dependency_idl_files += brave_modules_dependency_idl_files
+
+ if (!is_android) {
+   modules_dependency_idl_files +=

test/BUILD.gn

@@ -587,6 +587,7 @@ test("brave_browser_tests") {
     "//brave/renderer/brave_content_settings_agent_impl_autoplay_browsertest.cc",
     "//brave/renderer/brave_content_settings_agent_impl_browsertest.cc",
     "//brave/renderer/brave_content_settings_agent_impl_flash_browsertest.cc",
+    "//brave/third_party/blink/renderer/modules/brave/navigator_browsertest.cc",
     "//chrome/browser/extensions/browsertest_util.cc",
     "//chrome/browser/extensions/browsertest_util.h",
     "//chrome/browser/extensions/extension_browsertest.cc",

test/data/detect_brave.html

@@ -0,0 +1,11 @@
+<script>
+  var brave_detected = false;
+  navigator.brave.isBrave().then((response) => {
+    if (response === true) {
+      brave_detected = true;
+    }
+  });
+  function getBraveDetected() {
+    return brave_detected;
+  }
+</script>

third_party/blink/renderer/includes.gni

@@ -0,0 +1,29 @@
+# common includes which can help minimize patches for
+# src/third_party/blink/renderer/core/BUILD.gn
+brave_blink_renderer_core_visibility = [
+  "//brave/third_party/blink/renderer/*"
+]
+
+brave_blink_renderer_core_public_deps = [
+  "//brave/third_party/blink/renderer"
+]
+
+# common includes which can help minimize patches for
+# src/third_party/blink/renderer/modules/BUILD.gn
+brave_blink_renderer_modules_visibility = [
+  "//brave/third_party/blink/renderer/*"
+]
+
+brave_blink_sub_modules = [
+  "//brave/third_party/blink/renderer/modules/brave"
+]
+
+# common includes which can help minimize patches for
+# src/third_party/blink/renderer/modules/modules_idl_files.gni
+brave_modules_idl_files = get_path_info([
+  "//brave/third_party/blink/renderer/modules/brave/brave.idl",
+], "abspath")
+
+brave_modules_dependency_idl_files = get_path_info([
+  "//brave/third_party/blink/renderer/modules/brave/navigator_brave.idl",
+], "abspath")

third_party/blink/renderer/modules/brave/BUILD.gn

@@ -0,0 +1,15 @@
+# Copyright (c) 2019 The Brave Authors. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import("//third_party/blink/renderer/modules/modules.gni")
+
+blink_modules_sources("brave") {
+  sources = [
+    "brave.cc",
+    "brave.h",
+    "navigator_brave.cc",
+    "navigator_brave.h",
+  ]
+}

third_party/blink/renderer/modules/brave/brave.cc

@@ -0,0 +1,20 @@
+/* Copyright (c) 2020 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "brave/third_party/blink/renderer/modules/brave/brave.h"
+
+#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
+#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
+
+namespace blink {
+
+ScriptPromise Brave::isBrave(ScriptState* script_state) {
+  auto* resolver = MakeGarbageCollected<ScriptPromiseResolver>(script_state);
+  ScriptPromise promise = resolver->Promise();
+  resolver->Resolve(true);
+  return promise;
+}
+
+}  // namespace blink

third_party/blink/renderer/modules/brave/brave.h

@@ -0,0 +1,29 @@
+// Copyright (c) 2020 The Brave Authors. All rights reserved.
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// you can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef BRAVE_THIRD_PARTY_BLINK_RENDERER_MODULES_BRAVE_BRAVE_H_
+#define BRAVE_THIRD_PARTY_BLINK_RENDERER_MODULES_BRAVE_BRAVE_H_
+
+#include "third_party/blink/renderer/modules/modules_export.h"
+#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
+#include "third_party/blink/renderer/platform/heap/handle.h"
+
+namespace blink {
+
+class ScriptPromise;
+class ScriptState;
+
+class MODULES_EXPORT Brave final
+    : public ScriptWrappable {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  Brave() = default;
+  ScriptPromise isBrave(ScriptState*);
+};
+
+}  // namespace blink
+
+#endif  // BRAVE_THIRD_PARTY_BLINK_RENDERER_MODULES_BRAVE_BRAVE_H_

third_party/blink/renderer/modules/brave/brave.idl

@@ -0,0 +1,7 @@
+/* Copyright (c) 2020 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+interface Brave {
+  [CallWith=ScriptState] Promise<boolean> isBrave();
+};

third_party/blink/renderer/modules/brave/navigator_brave.cc

@@ -0,0 +1,45 @@
+/* Copyright (c) 2020 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "brave/third_party/blink/renderer/modules/brave/navigator_brave.h"
+
+#include "third_party/blink/renderer/core/frame/navigator.h"
+#include "brave/third_party/blink/renderer/modules/brave/brave.h"
+
+namespace blink {
+
+NavigatorBrave::NavigatorBrave(Navigator& navigator)
+    : Supplement<Navigator>(navigator) {}
+
+// static
+const char NavigatorBrave::kSupplementName[] = "NavigatorBrave";
+
+NavigatorBrave& NavigatorBrave::From(Navigator& navigator) {
+  NavigatorBrave* supplement =
+      Supplement<Navigator>::From<NavigatorBrave>(navigator);
+  if (!supplement) {
+    supplement = MakeGarbageCollected<NavigatorBrave>(navigator);
+    ProvideTo(navigator, supplement);
+  }
+  return *supplement;
+}
+
+Brave* NavigatorBrave::brave(Navigator& navigator) {
+  return NavigatorBrave::From(navigator).brave();
+}
+
+Brave* NavigatorBrave::brave() {
+  if (!brave_) {
+    brave_ = MakeGarbageCollected<Brave>();
+  }
+  return brave_;
+}
+
+void NavigatorBrave::Trace(blink::Visitor* visitor) {
+  visitor->Trace(brave_);
+  Supplement<Navigator>::Trace(visitor);
+}
+
+}  // namespace blink

third_party/blink/renderer/modules/brave/navigator_brave.h

@@ -0,0 +1,45 @@
+// Copyright (c) 2020 The Brave Authors. All rights reserved.
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// you can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef BRAVE_THIRD_PARTY_BLINK_RENDERER_MODULES_BRAVE_NAVIGATOR_BRAVE_H_
+#define BRAVE_THIRD_PARTY_BLINK_RENDERER_MODULES_BRAVE_NAVIGATOR_BRAVE_H_
+
+#include "third_party/blink/renderer/core/frame/navigator.h"
+#include "third_party/blink/renderer/platform/bindings/name_client.h"
+#include "third_party/blink/renderer/platform/heap/handle.h"
+#include "third_party/blink/renderer/platform/supplementable.h"
+
+namespace blink {
+
+class Brave;
+class Navigator;
+
+class NavigatorBrave final
+    : public GarbageCollected<NavigatorBrave>,
+      public Supplement<Navigator>,
+      public NameClient {
+  USING_GARBAGE_COLLECTED_MIXIN(NavigatorBrave);
+
+ public:
+  static const char kSupplementName[];
+
+  static NavigatorBrave& From(Navigator&);
+  static Brave* brave(Navigator&);
+  Brave* brave();
+
+  explicit NavigatorBrave(Navigator&);
+
+  void Trace(blink::Visitor*) override;
+  const char* NameInHeapSnapshot() const override {
+    return "NavigatorBrave";
+  }
+
+ private:
+  Member<Brave> brave_;
+};
+
+}  // namespace blink
+
+#endif  // BRAVE_THIRD_PARTY_BLINK_RENDERER_MODULES_BRAVE_NAVIGATOR_BRAVE_H_

third_party/blink/renderer/modules/brave/navigator_brave.idl

@@ -0,0 +1,9 @@
+/* Copyright (c) 2020 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+[
+    ImplementedAs=NavigatorBrave
+] partial interface Navigator {
+    readonly attribute Brave brave;
+};

third_party/blink/renderer/modules/brave/navigator_browsertest.cc

@@ -0,0 +1,44 @@
+// Copyright (c) 2020 The Brave Authors. All rights reserved.
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// you can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include "base/path_service.h"
+#include "brave/browser/brave_content_browser_client.h"
+#include "brave/common/brave_paths.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/common/chrome_content_client.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/test/browser_test_utils.h"
+
+namespace {
+
+const char kDetectBraveTest[] = "/detect_brave.html";
+
+class NavigatorGetBraveDetectedTest : public InProcessBrowserTest {
+ public:
+  void SetUpOnMainThread() override {
+    InProcessBrowserTest::SetUpOnMainThread();
+
+    content::SetupCrossSiteRedirector(embedded_test_server());
+
+    brave::RegisterPathProvider();
+    base::FilePath test_data_dir;
+    base::PathService::Get(brave::DIR_TEST_DATA, &test_data_dir);
+    embedded_test_server()->ServeFilesFromDirectory(test_data_dir);
+
+    ASSERT_TRUE(embedded_test_server()->Start());
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(NavigatorGetBraveDetectedTest, IsDetected) {
+  GURL url = embedded_test_server()->GetURL(kDetectBraveTest);
+  ui_test_utils::NavigateToURL(browser(), url);
+  content::WebContents* contents =
+      browser()->tab_strip_model()->GetActiveWebContents();
+  EXPECT_EQ(true, EvalJs(
+      contents, "getBraveDetected()"));
+}
+
+}  // namespace