Web MIDI: implement permission infobar

chrome/browser/media/chrome_midi_permission_context.cc

+// Copyright 2013 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/media/chrome_midi_permission_context.h"
+
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/content_settings/host_content_settings_map.h"
+#include "chrome/browser/content_settings/permission_queue_controller.h"
+#include "chrome/browser/content_settings/permission_request_id.h"
+#include "chrome/browser/content_settings/tab_specific_content_settings.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/tab_contents/tab_util.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+
+ChromeMIDIPermissionContext::ChromeMIDIPermissionContext(Profile* profile)
+    : profile_(profile),
+      shutting_down_(false) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+}
+
+ChromeMIDIPermissionContext::~ChromeMIDIPermissionContext() {
+  DCHECK(!permission_queue_controller_);
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+}
+
+void ChromeMIDIPermissionContext::Shutdown() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  permission_queue_controller_.reset();
+  shutting_down_ = true;
+}
+
+void ChromeMIDIPermissionContext::RequestMIDISysExPermission(
+    int render_process_id,
+    int render_view_id,
+    const GURL& requesting_frame,
+    const content::BrowserContext::MIDISysExPermissionCallback& callback) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK(!shutting_down_);
+
+  // TODO(toyoshim): Support Extension's manifest declared permission.
+  // http://crbug.com/266338 .
+
+  content::WebContents* web_contents =
+    tab_util::GetWebContentsByID(render_process_id, render_view_id);
+
+  // The page doesn't exist any more.
+  if (!web_contents)
+    return;
+
+  const PermissionRequestID id(render_process_id, render_view_id, 0);
+
+  GURL embedder = web_contents->GetURL();
+  if (!requesting_frame.is_valid() || !embedder.is_valid()) {
+    LOG(WARNING) << "Attempt to use MIDI sysex from an invalid URL: "
+                 << requesting_frame << "," << embedder
+                 << " (Web MIDI is not supported in popups)";
+    PermissionDecided(id, requesting_frame, embedder, callback, false);
+    return;
+  }
+
+  DecidePermission(id, requesting_frame, embedder, callback);
+}
+
+void ChromeMIDIPermissionContext::DecidePermission(
+    const PermissionRequestID& id,
+    const GURL& requesting_frame,
+    const GURL& embedder,
+    const content::BrowserContext::MIDISysExPermissionCallback& callback) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  ContentSetting content_setting =
+      profile_->GetHostContentSettingsMap()->GetContentSetting(
+          requesting_frame,
+          embedder,
+          CONTENT_SETTINGS_TYPE_MIDI_SYSEX,
+          std::string());
+  switch (content_setting) {
+    case CONTENT_SETTING_BLOCK:
+      PermissionDecided(id, requesting_frame, embedder, callback, false);
+      break;
+    case CONTENT_SETTING_ALLOW:
+      PermissionDecided(id, requesting_frame, embedder, callback, true);
+      break;
+    default:
+      GetQueueController()->CreateInfoBarRequest(
+          id, requesting_frame, embedder, base::Bind(
+              &ChromeMIDIPermissionContext::NotifyPermissionSet,
+              base::Unretained(this), id, requesting_frame, callback));
+  }
+}
+
+void ChromeMIDIPermissionContext::PermissionDecided(
+    const PermissionRequestID& id,
+    const GURL& requesting_frame,
+    const GURL& embedder,
+    const content::BrowserContext::MIDISysExPermissionCallback& callback,
+    bool allowed) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  NotifyPermissionSet(id, requesting_frame, callback, allowed);
+}
+
+void ChromeMIDIPermissionContext::NotifyPermissionSet(
+    const PermissionRequestID& id,
+    const GURL& requesting_frame,
+    const content::BrowserContext::MIDISysExPermissionCallback& callback,
+    bool allowed) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  TabSpecificContentSettings* content_settings =
+      TabSpecificContentSettings::Get(id.render_process_id(),
+                                      id.render_view_id());
+  if (content_settings) {
+    if (allowed)
+      content_settings->OnMIDISysExAccessed(requesting_frame);
+    else
+      content_settings->OnMIDISysExAccessBlocked(requesting_frame);
+  }
+
+  callback.Run(allowed);
+}
+
+PermissionQueueController* ChromeMIDIPermissionContext::GetQueueController() {
+  if (!permission_queue_controller_) {
+    permission_queue_controller_.reset(
+        new PermissionQueueController(profile_,
+                                      CONTENT_SETTINGS_TYPE_MIDI_SYSEX));
+  }
+  return permission_queue_controller_.get();
+}