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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_COMMON_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
#define EXTENSIONS_COMMON_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
#include <stddef.h>
#include <algorithm>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include "base/json/json_writer.h"
#include "base/stl_util.h"
#include "base/values.h"
#include "extensions/common/permissions/api_permission.h"
namespace extensions {
// An abstract base class for permissions that are represented by the
// disjunction of a set of conditions. Each condition is represented by a
// `PermissionDataType` (e.g. SocketPermissionData). If an
// APIPermission::CheckParam matches any of the conditions in the set, the
// permission is granted.
//
// For an example of how to use this class, see SocketPermission.
template <class PermissionDataType, class DerivedType>
class SetDisjunctionPermission : public APIPermission {
public:
explicit SetDisjunctionPermission(const APIPermissionInfo* info)
: APIPermission(info) {}
~SetDisjunctionPermission() override {}
// APIPermission overrides
bool Check(const APIPermission::CheckParam* param) const override {
for (const auto& item : data_set_) {
if (item.Check(param))
return true;
}
return false;
}
bool Contains(const APIPermission* rhs) const override {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
return std::ranges::includes(data_set_, perm->data_set_);
}
bool Equal(const APIPermission* rhs) const override {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
return data_set_ == perm->data_set_;
}
std::unique_ptr<APIPermission> Clone() const override {
auto result = std::make_unique<DerivedType>(info());
result->data_set_ = data_set_;
return result;
}
std::unique_ptr<APIPermission> Diff(const APIPermission* rhs) const override {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
std::unique_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
result->data_set_ = base::STLSetDifference<std::set<PermissionDataType> >(
data_set_, perm->data_set_);
return result->data_set_.empty() ? nullptr : std::move(result);
}
std::unique_ptr<APIPermission> Union(
const APIPermission* rhs) const override {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
std::unique_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
result->data_set_ = base::STLSetUnion<std::set<PermissionDataType> >(
data_set_, perm->data_set_);
return result;
}
std::unique_ptr<APIPermission> Intersect(
const APIPermission* rhs) const override {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
std::unique_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
result->data_set_ = base::STLSetIntersection<std::set<PermissionDataType> >(
data_set_, perm->data_set_);
return result->data_set_.empty() ? nullptr : std::move(result);
}
bool FromValue(
const base::Value* value,
std::string* error,
std::vector<std::string>* unhandled_permissions) override {
data_set_.clear();
if (!value) {
// treat null as an empty list.
return true;
}
if (!value->is_list()) {
if (error)
*error = "Cannot parse the permission list. It's not a list.";
return false;
}
for (const base::Value& item_value : value->GetList()) {
PermissionDataType data;
if (data.FromValue(&item_value)) {
data_set_.insert(data);
} else {
std::string unknown_permission;
base::JSONWriter::Write(item_value, &unknown_permission);
if (unhandled_permissions) {
unhandled_permissions->push_back(unknown_permission);
} else {
if (error) {
*error = "Cannot parse an item from the permission list: " +
unknown_permission;
}
return false;
}
}
}
return true;
}
std::unique_ptr<base::Value> ToValue() const override {
base::Value::List list;
for (const auto& item : data_set_) {
list.Append(base::Value::FromUniquePtrValue(item.ToValue()));
}
return std::make_unique<base::Value>(std::move(list));
}
protected:
std::set<PermissionDataType> data_set_;
};
} // namespace extensions
#endif // EXTENSIONS_COMMON_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
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