1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_COMMON_EXTENSIONS_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
6 #define CHROME_COMMON_EXTENSIONS_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_
12 #include "base/memory/scoped_ptr.h"
13 #include "base/values.h"
14 #include "chrome/common/extensions/extension_messages.h"
15 #include "extensions/common/permissions/api_permission.h"
16 #include "ipc/ipc_message.h"
17 #include "ipc/ipc_message_utils.h"
19 namespace extensions {
21 // An abstract base class for permissions that are represented by the
22 // disjunction of a set of conditions. Each condition is represented by a
23 // |PermissionDataType| (e.g. SocketPermissionData). If an
24 // APIPermission::CheckParam matches any of the conditions in the set, the
25 // permission is granted.
27 // For an example of how to use this class, see SocketPermission.
28 template <class PermissionDataType, class DerivedType>
29 class SetDisjunctionPermission : public APIPermission {
31 explicit SetDisjunctionPermission(const APIPermissionInfo* info)
32 : APIPermission(info) {
35 ~SetDisjunctionPermission() {
38 // APIPermission overrides
39 virtual bool HasMessages() const OVERRIDE {
40 return !data_set_.empty();
43 virtual bool Check(const APIPermission::CheckParam* param) const OVERRIDE {
44 for (typename std::set<PermissionDataType>::const_iterator i =
45 data_set_.begin(); i != data_set_.end(); ++i) {
52 virtual bool Contains(const APIPermission* rhs) const OVERRIDE {
53 CHECK(rhs->info() == info());
54 const SetDisjunctionPermission* perm =
55 static_cast<const SetDisjunctionPermission*>(rhs);
57 data_set_.begin(), data_set_.end(),
58 perm->data_set_.begin(), perm->data_set_.end());
61 virtual bool Equal(const APIPermission* rhs) const OVERRIDE {
62 CHECK(rhs->info() == info());
63 const SetDisjunctionPermission* perm =
64 static_cast<const SetDisjunctionPermission*>(rhs);
65 return data_set_ == perm->data_set_;
68 virtual APIPermission* Clone() const OVERRIDE {
69 SetDisjunctionPermission* result = new DerivedType(info());
70 result->data_set_ = data_set_;
74 virtual APIPermission* Diff(const APIPermission* rhs) const OVERRIDE {
75 CHECK(rhs->info() == info());
76 const SetDisjunctionPermission* perm =
77 static_cast<const SetDisjunctionPermission*>(rhs);
78 scoped_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
80 data_set_.begin(), data_set_.end(),
81 perm->data_set_.begin(), perm->data_set_.end(),
82 std::inserter<std::set<PermissionDataType> >(
83 result->data_set_, result->data_set_.begin()));
84 return result->data_set_.empty() ? NULL : result.release();
87 virtual APIPermission* Union(const APIPermission* rhs) const OVERRIDE {
88 CHECK(rhs->info() == info());
89 const SetDisjunctionPermission* perm =
90 static_cast<const SetDisjunctionPermission*>(rhs);
91 scoped_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
93 data_set_.begin(), data_set_.end(),
94 perm->data_set_.begin(), perm->data_set_.end(),
95 std::inserter<std::set<PermissionDataType> >(
96 result->data_set_, result->data_set_.begin()));
97 return result.release();
100 virtual APIPermission* Intersect(const APIPermission* rhs) const OVERRIDE {
101 CHECK(rhs->info() == info());
102 const SetDisjunctionPermission* perm =
103 static_cast<const SetDisjunctionPermission*>(rhs);
104 scoped_ptr<SetDisjunctionPermission> result(new DerivedType(info()));
105 std::set_intersection(
106 data_set_.begin(), data_set_.end(),
107 perm->data_set_.begin(), perm->data_set_.end(),
108 std::inserter<std::set<PermissionDataType> >(
109 result->data_set_, result->data_set_.begin()));
110 return result->data_set_.empty() ? NULL : result.release();
113 virtual bool FromValue(const base::Value* value,
114 std::string* error) OVERRIDE {
116 const base::ListValue* list = NULL;
118 if (!value || !value->GetAsList(&list) || list->GetSize() == 0) {
120 *error = "NULL or empty permission list";
124 for (size_t i = 0; i < list->GetSize(); ++i) {
125 const base::Value* item_value = NULL;
126 bool got_item = list->Get(i, &item_value);
130 PermissionDataType data;
131 if (!data.FromValue(item_value)) {
133 *error = "Cannot parse an item from the permission list";
137 data_set_.insert(data);
142 virtual scoped_ptr<base::Value> ToValue() const OVERRIDE {
143 base::ListValue* list = new base::ListValue();
144 typename std::set<PermissionDataType>::const_iterator i;
145 for (i = data_set_.begin(); i != data_set_.end(); ++i) {
146 scoped_ptr<base::Value> item_value(i->ToValue());
147 list->Append(item_value.release());
149 return scoped_ptr<base::Value>(list);
152 virtual void Write(IPC::Message* m) const OVERRIDE {
153 IPC::WriteParam(m, data_set_);
156 virtual bool Read(const IPC::Message* m, PickleIterator* iter) OVERRIDE {
157 return IPC::ReadParam(m, iter, &data_set_);
160 virtual void Log(std::string* log) const OVERRIDE {
161 IPC::LogParam(data_set_, log);
165 std::set<PermissionDataType> data_set_;
168 } // namespace extensions
170 #endif // CHROME_COMMON_EXTENSIONS_PERMISSIONS_SET_DISJUNCTION_PERMISSION_H_