1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
// Copyright 2016 The Weave 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 "src/access_black_list_manager_impl.h"
#include <base/json/json_reader.h>
#include <base/json/json_writer.h>
#include <base/values.h>
#include "src/commands/schema_constants.h"
#include "src/data_encoding.h"
namespace weave {
namespace {
const char kConfigFileName[] = "black_list";
const char kUser[] = "user";
const char kApp[] = "app";
const char kExpiration[] = "expiration";
}
AccessBlackListManagerImpl::AccessBlackListManagerImpl(
provider::ConfigStore* store,
size_t capacity,
base::Clock* clock)
: capacity_{capacity}, clock_{clock}, store_{store} {
Load();
}
void AccessBlackListManagerImpl::Load() {
if (!store_)
return;
if (auto list = base::ListValue::From(
base::JSONReader::Read(store_->LoadSettings(kConfigFileName)))) {
for (const auto& e : *list) {
const base::DictionaryValue* entry{nullptr};
std::string user;
std::string app;
decltype(entries_)::key_type key;
int expiration;
if (e->GetAsDictionary(&entry) && entry->GetString(kUser, &user) &&
Base64Decode(user, &key.first) && entry->GetString(kApp, &app) &&
Base64Decode(app, &key.second) &&
entry->GetInteger(kExpiration, &expiration)) {
base::Time expiration_time = base::Time::FromTimeT(expiration);
if (expiration_time > clock_->Now())
entries_[key] = expiration_time;
}
}
if (entries_.size() < list->GetSize()) {
// Save some storage space by saving without expired entries.
Save({});
}
}
}
void AccessBlackListManagerImpl::Save(const DoneCallback& callback) {
if (!store_) {
if (!callback.is_null())
callback.Run(nullptr);
return;
}
base::ListValue list;
for (const auto& e : entries_) {
scoped_ptr<base::DictionaryValue> entry{new base::DictionaryValue};
entry->SetString(kUser, Base64Encode(e.first.first));
entry->SetString(kApp, Base64Encode(e.first.second));
entry->SetInteger(kExpiration, e.second.ToTimeT());
list.Append(std::move(entry));
}
std::string json;
base::JSONWriter::Write(list, &json);
store_->SaveSettings(kConfigFileName, json, callback);
}
void AccessBlackListManagerImpl::RemoveExpired() {
for (auto i = begin(entries_); i != end(entries_);) {
if (i->second <= clock_->Now())
i = entries_.erase(i);
else
++i;
}
}
void AccessBlackListManagerImpl::Block(const std::vector<uint8_t>& user_id,
const std::vector<uint8_t>& app_id,
const base::Time& expiration,
const DoneCallback& callback) {
// Iterating is OK as Save below is more expensive.
RemoveExpired();
if (expiration <= clock_->Now()) {
if (!callback.is_null()) {
ErrorPtr error;
Error::AddTo(&error, FROM_HERE, "aleady_expired",
"Entry already expired");
callback.Run(std::move(error));
}
return;
}
if (entries_.size() >= capacity_) {
if (!callback.is_null()) {
ErrorPtr error;
Error::AddTo(&error, FROM_HERE, "blacklist_is_full",
"Unable to store more entries");
callback.Run(std::move(error));
}
return;
}
auto& value = entries_[std::make_pair(user_id, app_id)];
value = std::max(value, expiration);
Save(callback);
}
void AccessBlackListManagerImpl::Unblock(const std::vector<uint8_t>& user_id,
const std::vector<uint8_t>& app_id,
const DoneCallback& callback) {
if (!entries_.erase(std::make_pair(user_id, app_id))) {
if (!callback.is_null()) {
ErrorPtr error;
Error::AddTo(&error, FROM_HERE, "entry_not_found", "Unknown entry");
callback.Run(std::move(error));
}
return;
}
// Iterating is OK as Save below is more expensive.
RemoveExpired();
Save(callback);
}
bool AccessBlackListManagerImpl::IsBlocked(
const std::vector<uint8_t>& user_id,
const std::vector<uint8_t>& app_id) const {
for (const auto& user : {{}, user_id}) {
for (const auto& app : {{}, app_id}) {
auto both = entries_.find(std::make_pair(user, app));
if (both != end(entries_) && both->second > clock_->Now())
return true;
}
}
return false;
}
std::vector<AccessBlackListManager::Entry>
AccessBlackListManagerImpl::GetEntries() const {
std::vector<Entry> result;
for (const auto& e : entries_)
result.push_back({e.first.first, e.first.second, e.second});
return result;
}
size_t AccessBlackListManagerImpl::GetSize() const {
return entries_.size();
}
size_t AccessBlackListManagerImpl::GetCapacity() const {
return capacity_;
}
} // namespace weave
|
