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// 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.
#ifndef EXTENSIONS_COMMON_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
#define EXTENSIONS_COMMON_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
#include <stddef.h>
#include <set>
#include <string>
#include "base/json/json_writer.h"
#include "base/memory/scoped_ptr.h"
#include "base/values.h"
#include "extensions/common/extension_messages.h"
#include "extensions/common/permissions/api_permission.h"
#include "ipc/ipc_message.h"
#include "ipc/ipc_message_utils.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 (typename std::set<PermissionDataType>::const_iterator i =
data_set_.begin();
i != data_set_.end();
++i) {
if (i->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 base::STLIncludes<std::set<PermissionDataType> >(
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_;
}
APIPermission* Clone() const override {
SetDisjunctionPermission* result = new DerivedType(info());
result->data_set_ = data_set_;
return result;
}
APIPermission* Diff(const APIPermission* rhs) const override {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
scoped_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
result->data_set_ = base::STLSetDifference<std::set<PermissionDataType> >(
data_set_, perm->data_set_);
return result->data_set_.empty() ? NULL : result.release();
}
APIPermission* Union(const APIPermission* rhs) const override {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
scoped_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
result->data_set_ = base::STLSetUnion<std::set<PermissionDataType> >(
data_set_, perm->data_set_);
return result.release();
}
APIPermission* Intersect(const APIPermission* rhs) const override {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
scoped_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
result->data_set_ = base::STLSetIntersection<std::set<PermissionDataType> >(
data_set_, perm->data_set_);
return result->data_set_.empty() ? NULL : result.release();
}
bool FromValue(
const base::Value* value,
std::string* error,
std::vector<std::string>* unhandled_permissions) override {
data_set_.clear();
const base::ListValue* list = NULL;
if (!value) {
// treat null as an empty list.
return true;
}
if (!value->GetAsList(&list)) {
if (error)
*error = "Cannot parse the permission list. It's not a list.";
return false;
}
for (size_t i = 0; i < list->GetSize(); ++i) {
const base::Value* item_value = NULL;
bool got_item = list->Get(i, &item_value);
DCHECK(got_item);
DCHECK(item_value);
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;
}
scoped_ptr<base::Value> ToValue() const override {
base::ListValue* list = new base::ListValue();
typename std::set<PermissionDataType>::const_iterator i;
for (i = data_set_.begin(); i != data_set_.end(); ++i) {
scoped_ptr<base::Value> item_value(i->ToValue());
list->Append(item_value.release());
}
return scoped_ptr<base::Value>(list);
}
void Write(base::Pickle* m) const override { IPC::WriteParam(m, data_set_); }
bool Read(const base::Pickle* m, base::PickleIterator* iter) override {
return IPC::ReadParam(m, iter, &data_set_);
}
void Log(std::string* log) const override {
IPC::LogParam(data_set_, log);
}
protected:
std::set<PermissionDataType> data_set_;
};
} // namespace extensions
#endif // EXTENSIONS_COMMON_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
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