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// Copyright (c) 2012 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 CHROME_COMMON_EXTENSIONS_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
#define CHROME_COMMON_EXTENSIONS_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
#include <algorithm>
#include <set>
#include <string>
#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() {
}
// APIPermission overrides
virtual bool HasMessages() const OVERRIDE {
return !data_set_.empty();
}
virtual 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;
}
virtual bool Contains(const APIPermission* rhs) const OVERRIDE {
CHECK(rhs->info() == info());
const SetDisjunctionPermission* perm =
static_cast<const SetDisjunctionPermission*>(rhs);
return std::includes(
data_set_.begin(), data_set_.end(),
perm->data_set_.begin(), perm->data_set_.end());
}
virtual 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_;
}
virtual APIPermission* Clone() const OVERRIDE {
SetDisjunctionPermission* result = new DerivedType(info());
result->data_set_ = data_set_;
return result;
}
virtual 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()));
std::set_difference(
data_set_.begin(), data_set_.end(),
perm->data_set_.begin(), perm->data_set_.end(),
std::inserter<std::set<PermissionDataType> >(
result->data_set_, result->data_set_.begin()));
return result->data_set_.empty() ? NULL : result.release();
}
virtual 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()));
std::set_union(
data_set_.begin(), data_set_.end(),
perm->data_set_.begin(), perm->data_set_.end(),
std::inserter<std::set<PermissionDataType> >(
result->data_set_, result->data_set_.begin()));
return result.release();
}
virtual 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()));
std::set_intersection(
data_set_.begin(), data_set_.end(),
perm->data_set_.begin(), perm->data_set_.end(),
std::inserter<std::set<PermissionDataType> >(
result->data_set_, result->data_set_.begin()));
return result->data_set_.empty() ? NULL : result.release();
}
virtual bool FromValue(const base::Value* value,
std::string* error) OVERRIDE {
data_set_.clear();
const base::ListValue* list = NULL;
if (!value || !value->GetAsList(&list) || list->GetSize() == 0) {
if (error)
*error = "NULL or empty permission 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)) {
if (error)
*error = "Cannot parse an item from the permission list";
return false;
}
data_set_.insert(data);
}
return true;
}
virtual 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);
}
virtual void Write(IPC::Message* m) const OVERRIDE {
IPC::WriteParam(m, data_set_);
}
virtual bool Read(const IPC::Message* m, PickleIterator* iter) OVERRIDE {
return IPC::ReadParam(m, iter, &data_set_);
}
virtual void Log(std::string* log) const OVERRIDE {
IPC::LogParam(data_set_, log);
}
protected:
std::set<PermissionDataType> data_set_;
};
} // namespace extensions
#endif // CHROME_COMMON_EXTENSIONS_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
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