Add an external protocol dialog for ARC

chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc

Index: chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
diff --git a/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc b/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1f7713b2c910873d3783da3a041691bbc0d6a065
--- /dev/null
+++ b/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
@@ -0,0 +1,190 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/chromeos/arc/arc_external_protocol_dialog.h"
+
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/chromeos/arc/arc_navigation_throttle.h"
+#include "chrome/browser/chromeos/arc/page_transition_util.h"
+#include "chrome/browser/chromeos/external_protocol_dialog.h"
+#include "chrome/browser/tab_contents/tab_util.h"
+#include "chrome/browser/ui/browser_dialogs.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/arc/arc_service_manager.h"
+#include "components/arc/intent_helper/activity_icon_loader.h"
+#include "components/arc/intent_helper/arc_intent_helper_bridge.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "ui/gfx/image/image.h"
+#include "url/gurl.h"
+
+using content::WebContents;
+
+namespace arc {
+
+namespace {
+
+constexpr int kMinInstanceVersion = 3;  // RequestActivityIcons' MinVersion.

[Luis Héctor Chávez, 2016/09/15 22:42:11]

nit: uint32_t.

[Yusuke Sato, 2016/09/15 23:08:24]

Done.

+
+// Shows the Chrome OS' original external protocol dialog as a fallback.
+void ShowFallbackExternalProtocolDialog(int render_process_host_id,
+                                        int routing_id,
+                                        const GURL& url) {
+  WebContents* web_contents =
+      tab_util::GetWebContentsByID(render_process_host_id, routing_id);
+  new ExternalProtocolDialog(web_contents, url);
+}
+
+mojom::IntentHelperInstance* GetIntentHelper() {
+  return ArcIntentHelperBridge::GetIntentHelperInstance(kMinInstanceVersion);
+}
+
+scoped_refptr<ActivityIconLoader> GetIconLoader() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  ArcServiceManager* arc_service_manager = ArcServiceManager::Get();
+  return arc_service_manager ? arc_service_manager->icon_loader() : nullptr;
+}
+
+// Called when the dialog is closed.
+void OnIntentPickerClosed(int render_process_host_id,
+                          int routing_id,
+                          const GURL& url,
+                          mojo::Array<mojom::UrlHandlerInfoPtr> handlers,
+                          size_t selected_app_index,
+                          ArcNavigationThrottle::CloseReason close_reason) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  mojom::IntentHelperInstance* intent_helper = GetIntentHelper();
+  if (!intent_helper || selected_app_index >= handlers.size())
+    close_reason = ArcNavigationThrottle::CloseReason::ERROR;
+
+  switch (close_reason) {
+    case ArcNavigationThrottle::CloseReason::ALWAYS_PRESSED: {
+      intent_helper->AddPreferredPackage(
+          handlers[selected_app_index]->package_name);
+      // fall through.
+    }
+    case ArcNavigationThrottle::CloseReason::JUST_ONCE_PRESSED:
+    case ArcNavigationThrottle::CloseReason::PREFERRED_ACTIVITY_FOUND: {
+      // Launch the selected app.
+      intent_helper->HandleUrl(url.spec(),
+                               handlers[selected_app_index]->package_name);
+      break;
+    }
+    case ArcNavigationThrottle::CloseReason::ERROR:
+    case ArcNavigationThrottle::CloseReason::INVALID: {
+      LOG(ERROR) << "IntentPickerBubbleView returned unexpected close_reason: "
+                 << static_cast<int>(close_reason);
+      // fall through.
+    }
+    case ArcNavigationThrottle::CloseReason::DIALOG_DEACTIVATED: {
+      // The user didn't select any ARC activity. Show the Chrome OS dialog.
+      ShowFallbackExternalProtocolDialog(render_process_host_id, routing_id,
+                                         url);
+      break;
+    }
+  }
+}
+
+// Called when ARC returned activity icons for the |handlers|.
+void OnAppIconsReceived(
+    int render_process_host_id,
+    int routing_id,
+    const GURL& url,
+    mojo::Array<mojom::UrlHandlerInfoPtr> handlers,
+    std::unique_ptr<ActivityIconLoader::ActivityToIconsMap> icons) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  using NameAndIcon = std::pair<std::string, gfx::Image>;
+  std::vector<NameAndIcon> app_info;
+
+  for (const auto& handler : handlers) {
+    gfx::Image icon;

[Luis Héctor Chávez, 2016/09/15 22:42:11]

This doesn't seem to be used.

[Yusuke Sato, 2016/09/15 23:08:24]

Done.

+    const ActivityIconLoader::ActivityName activity(handler->package_name,
+                                                    handler->activity_name);
+    const auto it = icons->find(activity);
+    app_info.emplace_back(
+        handler->name, it != icons->end() ? it->second.icon20 : gfx::Image());
+  }
+
+  auto show_bubble_cb = base::Bind(ShowIntentPickerBubble());
+  WebContents* web_contents =
+      tab_util::GetWebContentsByID(render_process_host_id, routing_id);
+  show_bubble_cb.Run(web_contents, app_info,
+                     base::Bind(OnIntentPickerClosed, render_process_host_id,
+                                routing_id, url, base::Passed(&handlers)));
+}
+
+// Called when ARC returned a handler list for the |url|.
+void OnUrlHandlerList(int render_process_host_id,
+                      int routing_id,
+                      const GURL& url,
+                      mojo::Array<mojom::UrlHandlerInfoPtr> handlers) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  mojom::IntentHelperInstance* intent_helper = GetIntentHelper();
+  scoped_refptr<ActivityIconLoader> icon_loader = GetIconLoader();
+
+  if (!intent_helper || !icon_loader || !handlers.size()) {
+    // No handler is available on ARC side. Show the Chrome OS dialog.
+    ShowFallbackExternalProtocolDialog(render_process_host_id, routing_id, url);
+    return;
+  }
+
+  if (handlers.size() == 1) {
+    // Special case. When ARC has only one activity for the |url|, silently
+    // launch the app to be consistent with Android's behavior. No UI needed
+    // in this case.
+    intent_helper->HandleUrl(url.spec(), handlers[0]->package_name);
+    return;
+  }
+
+  // Otherwise, retrieve icons of the activities.
+  std::vector<ActivityIconLoader::ActivityName> activities;
+  for (const auto& handler : handlers) {
+    activities.emplace_back(handler->package_name, handler->activity_name);
+  }
+  icon_loader->GetActivityIcons(
+      activities, base::Bind(OnAppIconsReceived, render_process_host_id,
+                             routing_id, url, base::Passed(&handlers)));
+}
+
+}  // namespace
+
+// static
+bool RunArcExternalProtocolDialog(const GURL& url,
+                                  int render_process_host_id,
+                                  int routing_id,
+                                  ui::PageTransition page_transition,
+                                  bool has_user_gesture) {
+  if (ShouldIgnoreNavigation(page_transition))
+    return false;
+
+  mojom::IntentHelperInstance* intent_helper = GetIntentHelper();
+  if (!intent_helper)
+    return false;  // ARC is either not supported or not yet ready.
+
+  WebContents* web_contents =
+      tab_util::GetWebContentsByID(render_process_host_id, routing_id);
+  if (!web_contents || !web_contents->GetBrowserContext() ||
+      web_contents->GetBrowserContext()->IsOffTheRecord()) {
+    return false;
+  }
+
+  // Show ARC version of the dialog, which is IntentPickerBubbleView. To show
+  // the bubble view, we need to ask ARC for a handler list first.
+  intent_helper->RequestUrlHandlerList(

[Luis Héctor Chávez, 2016/09/15 22:42:11]

What would happen if ARC were to completely crash before the callback fires?

[Yusuke Sato, 2016/09/15 23:08:24]

In that case, no dialog will be shown for the user click, and I feel that's
acceptable. The Chrome OS' default dialog will be shown (because of the check at
line 173) if the user clicks the link again.

+      url.spec(),
+      base::Bind(OnUrlHandlerList, render_process_host_id, routing_id, url));
+  return true;
+}
+
+}  // namespace arc