[PUSH] Merge notifications and push messaging prompts

chrome/browser/services/gcm/push_messaging_permission_context.cc

 // Copyright 2014 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/services/gcm/push_messaging_permission_context.h"
 
+#include "chrome/browser/profiles/profile.h"
+#include "components/content_settings/core/browser/host_content_settings_map.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_delegate.h"
+
+const ContentSettingsType kPushSettingType =
+    CONTENT_SETTINGS_TYPE_PUSH_MESSAGING;
+const ContentSettingsType kNotificationSettingType =
+    CONTENT_SETTINGS_TYPE_NOTIFICATIONS;
+
 namespace gcm {
 
 PushMessagingPermissionContext::PushMessagingPermissionContext(Profile* profile)
-    : PermissionContextBase(profile, CONTENT_SETTINGS_TYPE_PUSH_MESSAGING) {
+    : PermissionContextBase(profile, CONTENT_SETTINGS_TYPE_PUSH_MESSAGING),
+      profile_(profile) {
 }
 
 PushMessagingPermissionContext::~PushMessagingPermissionContext() {
 }
 
+ContentSetting PushMessagingPermissionContext::GetPermissionStatus(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin) const {
+  ContentSetting push_content_setting =
+      profile_->GetHostContentSettingsMap()->GetContentSetting(
+          requesting_origin, embedding_origin, kPushSettingType, std::string());
+
+  ContentSetting notifications_content_setting =
+      profile_->GetHostContentSettingsMap()->GetContentSetting(
+          requesting_origin, embedding_origin, kNotificationSettingType,
+          std::string());
+
+  if (notifications_content_setting == CONTENT_SETTING_BLOCK ||
+      push_content_setting == CONTENT_SETTING_BLOCK) {
+    return CONTENT_SETTING_BLOCK;
+  }
+  if (notifications_content_setting == CONTENT_SETTING_ASK ||
+      push_content_setting == CONTENT_SETTING_ASK) {
+    return CONTENT_SETTING_ASK;
+  }
+  DCHECK_EQ(CONTENT_SETTING_ALLOW, notifications_content_setting);
+  DCHECK_EQ(CONTENT_SETTING_ALLOW, push_content_setting);
+  return CONTENT_SETTING_ALLOW;
+}
+
+// Unlike other permissions, push is decided by the following algorithm
+//  - You need to have notification permission granted.
+//  - You need to not have push permission explicitly blocked.
+//  - If those two things are true it is granted without prompting.
+// This is done to avoid double prompting for notifications and push.
+void PushMessagingPermissionContext::DecidePermission(
+    content::WebContents* web_contents,
+    const PermissionRequestID& id,
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    bool user_gesture,
+    const BrowserPermissionCallback& callback) {
+  ContentSetting notifications_content_setting =
+      profile_->GetHostContentSettingsMap()
+          ->GetContentSettingAndMaybeUpdateLastUsage(
+              requesting_origin, embedding_origin, kNotificationSettingType,
+              std::string());
+
+  if (notifications_content_setting != CONTENT_SETTING_ALLOW) {
+    DVLOG(1) << "Notification permission has not been granted.";
+    NotifyPermissionSet(id, requesting_origin, embedding_origin, callback,
+                        false /* persist */, false /* granted */);
+    return;
+  }
+
+  ContentSetting push_content_setting =
+      profile_->GetHostContentSettingsMap()
+          ->GetContentSettingAndMaybeUpdateLastUsage(
+              requesting_origin, embedding_origin, kPushSettingType,
+              std::string());
+
+  if (push_content_setting == CONTENT_SETTING_BLOCK) {
+    DVLOG(1) << "Push permission was explicitly blocked.";
+    NotifyPermissionSet(id, requesting_origin, embedding_origin, callback,
+                        false /* persist */, false /* granted */);
+    return;
+  }
+
+  NotifyPermissionSet(id, requesting_origin, embedding_origin, callback,
+                      true /* persist */, true /* granted */);
+}
+
 }  // namespace gcm