injects window.ethereum object into all frames

browser/resources/resource_ids

@@ -110,4 +110,7 @@
   "<(ROOT_GEN_DIR)/brave/web-ui-tor_internals/tor_internals.grd": {
     "includes": [46500],
   },
+  "<(ROOT_GEN_DIR)/brave/web-ui-brave_wallet_script/brave_wallet_script.grd": {
+    "includes": [46750]
+  },
 }

browser/ui/BUILD.gn

@@ -464,7 +464,10 @@ source_set("ui") {
       "webui/brave_wallet_ui.cc",
       "webui/brave_wallet_ui.h",
     ]
-    deps += [ "//brave/components/brave_wallet_ui:generated_resources" ]
+    deps += [
+      "//brave/components/brave_wallet_ui:generated_resources",
+      "//brave/components/brave_wallet/resources:generated_resources",
+    ]
   }
 
   if (toolkit_views) {

components/brave_wallet/renderer/BUILD.gn

@@ -0,0 +1,27 @@
+import("//build/config/features.gni")
+
+source_set("renderer") {
+  visibility = [
+    "//brave:child_dependencies",
+    "//brave/renderer/*",
+    "//chrome/renderer/*",
+    "//components/content_settings/renderer/*",
+  ]
+
+  sources = [
+    "brave_wallet_js_handler.cc",
+    "brave_wallet_js_handler.h",
+    "brave_wallet_render_frame_observer.cc",
+    "brave_wallet_render_frame_observer.h",
+  ]
+
+  deps = [
+    "//base",
+    "//brave/components/brave_wallet/resources:generated_resources",
+    "//content/public/renderer",
+    "//gin",
+    "//third_party/blink/public:blink",
+    "//third_party/blink/public/common",
+    "//v8",
+  ]
+}

components/brave_wallet/renderer/DEPS

@@ -0,0 +1,7 @@
+include_rules = [
+  "+content/public/renderer",
+  "+gin",
+  "+third_party/blink/public",
+  "+v8/include",
+  "+ui/base",
+]

components/brave_wallet/renderer/brave_wallet_js_handler.cc

@@ -0,0 +1,58 @@
+/* Copyright (c) 2021 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/components/brave_wallet/renderer/brave_wallet_js_handler.h"
+
+#include <string>
+
+#include "base/no_destructor.h"
+#include "base/strings/utf_string_conversions.h"
+#include "brave/components/brave_wallet/resources/grit/brave_wallet_script_generated_map.h"
+#include "content/public/renderer/render_frame.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "third_party/blink/public/web/blink.h"
+#include "third_party/blink/public/web/web_local_frame.h"
+#include "third_party/blink/public/web/web_script_source.h"
+
+namespace {
+
+static base::NoDestructor<std::string> g_provider_script("");
+
+std::string LoadDataResource(const int id) {
+  auto& resource_bundle = ui::ResourceBundle::GetSharedInstance();
+  if (resource_bundle.IsGzipped(id)) {
+    return resource_bundle.LoadDataResourceString(id);
+  }
+
+  return resource_bundle.GetRawDataResource(id).as_string();
+}
+
+}
+
+namespace brave_wallet {
+
+BraveWalletJSHandler::BraveWalletJSHandler(
+    content::RenderFrame* render_frame)
+    : render_frame_(render_frame) {
+  if (g_provider_script->empty()) {
+    *g_provider_script = LoadDataResource(kBraveWalletScriptGenerated[0].value);
+  }
+}
+
+BraveWalletJSHandler::~BraveWalletJSHandler() = default;
+
+void BraveWalletJSHandler::AddJavaScriptObjectToFrame(
+  v8::Local<v8::Context> context) {
+}
+
+void BraveWalletJSHandler::InjectScript() {
+  blink::WebLocalFrame* web_frame = render_frame_->GetWebFrame();
+  if (web_frame->IsProvisional())
+    return;
+
+  web_frame->ExecuteScript(blink::WebString::FromUTF8(*g_provider_script));
+}
+
+}  // namespace brave_wallet

components/brave_wallet/renderer/brave_wallet_js_handler.h

@@ -0,0 +1,29 @@
+/* Copyright (c) 2021 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_COMPONENTS_BRAVE_WALLET_RENDERER_BRAVE_WALLET_JS_HANDLER_H_
+#define BRAVE_COMPONENTS_BRAVE_WALLET_RENDERER_BRAVE_WALLET_JS_HANDLER_H_
+
+#include "content/public/renderer/render_frame.h"
+#include "url/gurl.h"
+#include "v8/include/v8.h"
+
+namespace brave_wallet {
+
+class BraveWalletJSHandler {
+ public:
+  BraveWalletJSHandler(content::RenderFrame* render_frame);
+  ~BraveWalletJSHandler();
+
+  void AddJavaScriptObjectToFrame(v8::Local<v8::Context> context);
+  void InjectScript();
+
+ private:
+  content::RenderFrame* render_frame_;
+};
+
+}  // namespace brave_wallet
+
+#endif  // BRAVE_COMPONENTS_BRAVE_WALLET_RENDERER_BRAVE_WALLET_JS_HANDLER_H_

components/brave_wallet/renderer/brave_wallet_render_frame_observer.cc

@@ -0,0 +1,47 @@
+/* Copyright (c) 2021 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/components/brave_wallet/renderer/brave_wallet_render_frame_observer.h"
+
+#include "base/bind.h"
+#include "content/public/renderer/render_frame.h"
+#include "third_party/blink/public/web/web_local_frame.h"
+
+namespace brave_wallet {
+
+BraveWalletRenderFrameObserver::BraveWalletRenderFrameObserver(
+    content::RenderFrame* render_frame)
+    : RenderFrameObserver(render_frame) {}
+
+BraveWalletRenderFrameObserver::~BraveWalletRenderFrameObserver() {}
+
+void BraveWalletRenderFrameObserver::DidStartNavigation(
+    const GURL& url,
+    base::Optional<blink::WebNavigationType> navigation_type) {
+  url_ = url;
+}
+
+void BraveWalletRenderFrameObserver::DidCreateScriptContext(
+    v8::Local<v8::Context> context,
+    int32_t world_id) {
+  if (!native_javascript_handle_)
+    return;
+
+  native_javascript_handle_->AddJavaScriptObjectToFrame(context);
+}
+
+void BraveWalletRenderFrameObserver::DidCreateNewDocument() {
+  if (!native_javascript_handle_) {
+    native_javascript_handle_.reset(
+        new BraveWalletJSHandler(render_frame()));
+  }
+  native_javascript_handle_->InjectScript();
+}
+
+void BraveWalletRenderFrameObserver::OnDestruct() {
+  delete this;
+}
+
+}  // namespace brave_wallet

components/brave_wallet/renderer/brave_wallet_render_frame_observer.h

@@ -0,0 +1,46 @@
+/* Copyright (c) 2021 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_COMPONENTS_BRAVE_WALLET_RENDERER_BRAVE_WALLET_RENDER_FRAME_OBSERVER_H_
+#define BRAVE_COMPONENTS_BRAVE_WALLET_RENDERER_BRAVE_WALLET_RENDER_FRAME_OBSERVER_H_
+
+#include <memory>
+
+#include "brave/components/brave_wallet/renderer/brave_wallet_js_handler.h"
+#include "content/public/renderer/render_frame.h"
+#include "content/public/renderer/render_frame_observer.h"
+#include "third_party/blink/public/web/web_navigation_type.h"
+#include "url/gurl.h"
+#include "v8/include/v8.h"
+
+namespace brave_wallet {
+
+class BraveWalletRenderFrameObserver
+    : public content::RenderFrameObserver {
+ public:
+  BraveWalletRenderFrameObserver(content::RenderFrame* render_frame);
+  ~BraveWalletRenderFrameObserver() override;
+
+  // RenderFrameObserver implementation.
+  void DidStartNavigation(
+      const GURL& url,
+      base::Optional<blink::WebNavigationType> navigation_type) override;
+  void DidCreateScriptContext(v8::Local<v8::Context> context,
+                              int32_t world_id) override;
+  void DidCreateNewDocument() override;
+
+ private:
+  // RenderFrameObserver implementation.
+  void OnDestruct() override;
+
+  // Handle to "handler" JavaScript object functionality.
+  std::unique_ptr<BraveWalletJSHandler> native_javascript_handle_;
+
+  GURL url_;
+};
+
+}  // namespace brave_wallet
+
+#endif  // BRAVE_COMPONENTS_BRAVE_WALLET_RENDERER_BRAVE_WALLET_RENDER_FRAME_OBSERVER_H_

components/brave_wallet/resources/BUILD.gn

@@ -0,0 +1,18 @@
+import("//brave/components/common/typescript.gni")
+import("//tools/grit/grit_rule.gni")
+import("//tools/grit/repack.gni")
+
+transpile_web_ui("brave_wallet_script_resources") {
+  entry_points = [ [
+        "brave_wallet_script",
+        rebase_path("brave_wallet_provider.js"),
+      ] ]
+
+  resource_name = "brave_wallet_script"
+}
+
+pack_web_resources("generated_resources") {
+  resource_name = "brave_wallet_script"
+  output_dir = "$root_gen_dir/brave/components/brave_wallet/resources"
+  deps = [ ":brave_wallet_script_resources" ]
+}

components/brave_wallet/resources/brave_wallet_provider.js

@@ -0,0 +1,12 @@
+// Copyright (c) 2021 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/.
+
+(function() {
+    window.ethereum = {
+      request: function(obj) {
+        return Promise.resolve()
+      }
+    }
+})()

components/resources/BUILD.gn

@@ -89,9 +89,13 @@ repack("resources") {
     ]
   }
 
-  if (brave_wallet_enabled && !is_android) {
-    deps += [ "//brave/components/brave_wallet_ui:generated_resources" ]
-    sources += [ "$root_gen_dir/brave/components/brave_wallet/resources/brave_wallet_generated.pak" ]
+  if (brave_wallet_enabled) {
+    if (!is_android) {
+      deps += [ "//brave/components/brave_wallet_ui:generated_resources" ]
+      sources += [ "$root_gen_dir/brave/components/brave_wallet/resources/brave_wallet_generated.pak" ]
+    }
+    deps += [ "//brave/components/brave_wallet/resources:generated_resources", ]
+    sources += [ "$root_gen_dir/brave/components/brave_wallet/resources/brave_wallet_script_generated.pak" ]
   }
 
   output = "$root_gen_dir/components/brave_components_resources.pak"

renderer/BUILD.gn

@@ -12,6 +12,7 @@ source_set("renderer") {
 
   deps = [
     "//brave/components/brave_shields/common",
+    "//brave/components/brave_wallet/renderer",
     "//brave/components/cosmetic_filters/renderer",
   ]
 }

renderer/brave_content_renderer_client.cc

@@ -7,6 +7,7 @@
 
 #include "base/feature_list.h"
 #include "brave/components/brave_shields/common/features.h"
+#include "brave/components/brave_wallet/renderer/brave_wallet_render_frame_observer.h"
 #include "brave/components/cosmetic_filters/renderer/cosmetic_filters_js_render_frame_observer.h"
 #include "chrome/common/chrome_isolated_world_ids.h"
 #include "third_party/blink/public/platform/web_runtime_features.h"
@@ -42,6 +43,8 @@ void BraveContentRendererClient::RenderFrameCreated(
 #endif
     new cosmetic_filters::CosmeticFiltersJsRenderFrameObserver(
         render_frame, ISOLATED_WORLD_ID_BRAVE_INTERNAL);
+  
+  new brave_wallet::BraveWalletRenderFrameObserver(render_frame);
 }
 
 void BraveContentRendererClient::RunScriptsAtDocumentStart(

renderer/sources.gni

@@ -3,6 +3,8 @@
 # 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("//brave/components/brave_wallet/buildflags/buildflags.gni")
+
 brave_chrome_renderer_sources = [
   "//brave/renderer/brave_content_renderer_client.cc",
   "//brave/renderer/brave_content_renderer_client.h",
@@ -12,3 +14,7 @@ brave_chrome_renderer_public_deps = [
   "//brave/components/content_settings/renderer",
   "//brave/components/cosmetic_filters/renderer",
 ]
+
+if (brave_wallet_enabled) {
+  brave_chrome_renderer_public_deps += [ "//brave/components/brave_wallet/renderer" ]
+}