Store USB device permissions in website settings.

chrome/browser/permissions/chooser_context_base.cc

+// Copyright 2015 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/permissions/chooser_context_base.h"
+
+#include <string>
+
+#include "base/values.h"
+#include "chrome/browser/content_settings/host_content_settings_map_factory.h"
+#include "components/content_settings/core/browser/host_content_settings_map.h"
+
+using ObjectList = ScopedVector<base::DictionaryValue>;
+
+const char kObjectListKey[] = "chosen-objects";
+
+ChooserContextBase::ChooserContextBase(
+    Profile* profile,
+    const ContentSettingsType data_content_settings_type)
+    : host_content_settings_map_(
+          HostContentSettingsMapFactory::GetForProfile(profile)),
+      data_content_settings_type_(data_content_settings_type) {
+  DCHECK(host_content_settings_map_);
+}
+
+ChooserContextBase::~ChooserContextBase() {}
+
+ObjectList ChooserContextBase::GetGrantedObjects(const GURL& requesting_origin,
+                                                 const GURL& embedding_origin) {
+  scoped_ptr<base::DictionaryValue> setting =
+      GetWebsiteSetting(requesting_origin, embedding_origin);
+  scoped_ptr<base::Value> objects;
+  if (!setting->Remove(kObjectListKey, &objects))
+    return ObjectList();
+
+  scoped_ptr<base::ListValue> object_list =
+      base::ListValue::From(objects.Pass());
+  if (!object_list)
+    return ObjectList();
+
+  ObjectList results;
+  for (base::ListValue::iterator it = object_list->begin();
+       it != object_list->end(); ++it) {
+    // Steal ownership of |object| from |object_list|.
+    scoped_ptr<base::Value> object(*it);
+    *it = nullptr;
+
+    scoped_ptr<base::DictionaryValue> object_dict =
+        base::DictionaryValue::From(object.Pass());
+    if (object_dict && IsValidObject(*object_dict))
+      results.push_back(object_dict.Pass());
+  }
+  return results.Pass();
+}
+
+void ChooserContextBase::GrantObjectPermission(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    scoped_ptr<base::DictionaryValue> object) {
+  DCHECK(object && IsValidObject(*object));
+  scoped_ptr<base::DictionaryValue> setting =
+      GetWebsiteSetting(requesting_origin, embedding_origin);
+  base::ListValue* object_list;
+  if (!setting->GetList(kObjectListKey, &object_list)) {
+    object_list = new base::ListValue();
+    setting->Set(kObjectListKey, object_list);
+  }
+  object_list->AppendIfNotPresent(object.release());
+  SetWebsiteSetting(requesting_origin, embedding_origin, setting.Pass());
+}
+
+void ChooserContextBase::RevokeObjectPermission(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    const base::DictionaryValue& object) {
+  DCHECK(IsValidObject(object));
+  scoped_ptr<base::DictionaryValue> setting =
+      GetWebsiteSetting(requesting_origin, embedding_origin);
+  base::ListValue* object_list;
+  if (!setting->GetList(kObjectListKey, &object_list))
+    return;
+  object_list->Remove(object, nullptr);
+  SetWebsiteSetting(requesting_origin, embedding_origin, setting.Pass());
+}
+
+scoped_ptr<base::DictionaryValue> ChooserContextBase::GetWebsiteSetting(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin) {
+  scoped_ptr<base::DictionaryValue> value =
+      base::DictionaryValue::From(host_content_settings_map_->GetWebsiteSetting(
+          requesting_origin, embedding_origin, data_content_settings_type_,
+          std::string(), nullptr));
+  if (!value)
+    value.reset(new base::DictionaryValue());
+
+  return value.Pass();
+}
+
+void ChooserContextBase::SetWebsiteSetting(const GURL& requesting_origin,
+                                           const GURL& embedding_origin,
+                                           scoped_ptr<base::Value> value) {
+  ContentSettingsPattern primary_pattern(
+      ContentSettingsPattern::FromURLNoWildcard(requesting_origin));
+  ContentSettingsPattern secondary_pattern(
+      ContentSettingsPattern::FromURLNoWildcard(embedding_origin));
+  if (!primary_pattern.IsValid() || !secondary_pattern.IsValid())
+    return;
+
+  host_content_settings_map_->SetWebsiteSetting(
+      primary_pattern, secondary_pattern, data_content_settings_type_,
+      std::string(), value.release());
+}