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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/common/features/feature_provider.h"
#include <map>
#include <memory>
#include <string_view>
#include "base/containers/map_util.h"
#include "base/debug/alias.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/span_printf.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/trace_event/trace_event.h"
#include "extensions/common/extensions_client.h"
#include "extensions/common/features/feature.h"
namespace extensions {
namespace {
// Writes |message| to the stack so that it shows up in the minidump, then
// crashes the current process.
//
// The prefix "e::" is used so that the crash can be quickly located.
//
// This is provided in feature_util because for some reason features are prone
// to mysterious crashes in named map lookups. For example see crbug.com/365192
// and crbug.com/461915.
#define CRASH_WITH_MINIDUMP(message) \
{ \
std::string message_copy(message); \
char minidump[BUFSIZ]; \
base::debug::Alias(&minidump); \
base::SpanPrintf(minidump, "e::%s:%d:\"%s\"", __FILE__, __LINE__, \
message_copy.c_str()); \
LOG(FATAL) << message_copy; \
}
class FeatureProviderStatic {
public:
FeatureProviderStatic() {
TRACE_EVENT0("startup",
"extensions::FeatureProvider::FeatureProviderStatic");
ExtensionsClient* client = ExtensionsClient::Get();
feature_providers_["api"] = client->CreateFeatureProvider("api");
feature_providers_["manifest"] = client->CreateFeatureProvider("manifest");
feature_providers_["permission"] =
client->CreateFeatureProvider("permission");
feature_providers_["behavior"] = client->CreateFeatureProvider("behavior");
}
FeatureProviderStatic(const FeatureProviderStatic&) = delete;
FeatureProviderStatic& operator=(const FeatureProviderStatic&) = delete;
const FeatureProvider* GetFeatures(const std::string& name) const {
auto* provider = base::FindPtrOrNull(feature_providers_, name);
if (!provider) {
CRASH_WITH_MINIDUMP("FeatureProvider \"" + name + "\" not found");
}
return provider;
}
private:
std::map<std::string, std::unique_ptr<FeatureProvider>> feature_providers_;
};
base::LazyInstance<FeatureProviderStatic>::Leaky g_feature_provider_static =
LAZY_INSTANCE_INITIALIZER;
const Feature* GetFeatureFromProviderByName(const std::string& provider_name,
const std::string& feature_name) {
const Feature* feature =
FeatureProvider::GetByName(provider_name)->GetFeature(feature_name);
// We should always refer to existing features, but we can't CHECK here
// due to flaky JSONReader fails, see: crbug.com/176381, crbug.com/602936
DCHECK(feature) << "Feature \"" << feature_name << "\" not found in "
<< "FeatureProvider \"" << provider_name << "\"";
return feature;
}
} // namespace
FeatureProvider::FeatureProvider() = default;
FeatureProvider::~FeatureProvider() = default;
// static
const FeatureProvider* FeatureProvider::GetByName(const std::string& name) {
return g_feature_provider_static.Get().GetFeatures(name);
}
// static
const FeatureProvider* FeatureProvider::GetAPIFeatures() {
return GetByName("api");
}
// static
const FeatureProvider* FeatureProvider::GetManifestFeatures() {
return GetByName("manifest");
}
// static
const FeatureProvider* FeatureProvider::GetPermissionFeatures() {
return GetByName("permission");
}
// static
const FeatureProvider* FeatureProvider::GetBehaviorFeatures() {
return GetByName("behavior");
}
// static
const Feature* FeatureProvider::GetAPIFeature(const std::string& name) {
return GetFeatureFromProviderByName("api", name);
}
// static
const Feature* FeatureProvider::GetManifestFeature(const std::string& name) {
return GetFeatureFromProviderByName("manifest", name);
}
// static
const Feature* FeatureProvider::GetPermissionFeature(const std::string& name) {
return GetFeatureFromProviderByName("permission", name);
}
// static
const Feature* FeatureProvider::GetBehaviorFeature(const std::string& name) {
return GetFeatureFromProviderByName("behavior", name);
}
const Feature* FeatureProvider::GetFeature(const std::string& name) const {
return base::FindPtrOrNull(features_, name);
}
const Feature* FeatureProvider::GetParent(const Feature& feature) const {
if (feature.no_parent())
return nullptr;
std::vector<std::string_view> split = base::SplitStringPiece(
feature.name(), ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
if (split.size() < 2)
return nullptr;
split.pop_back();
return GetFeature(base::JoinString(split, "."));
}
// Children of a given API are named starting with parent.name()+".", which
// means they'll be contiguous in the features_ std::map.
std::vector<const Feature*> FeatureProvider::GetChildren(
const Feature& parent) const {
std::string prefix = parent.name() + ".";
const FeatureMap::const_iterator first_child = features_.lower_bound(prefix);
// All children have names before (parent.name() + ('.'+1)).
++prefix.back();
const FeatureMap::const_iterator after_children =
features_.lower_bound(prefix);
std::vector<const Feature*> result;
result.reserve(std::distance(first_child, after_children));
for (FeatureMap::const_iterator it = first_child; it != after_children;
++it) {
if (!it->second->no_parent())
result.push_back(it->second.get());
}
return result;
}
const FeatureMap& FeatureProvider::GetAllFeatures() const {
return features_;
}
void FeatureProvider::AddFeature(std::string_view name,
std::unique_ptr<Feature> feature) {
DCHECK(feature);
const auto& map =
ExtensionsClient::Get()->GetFeatureDelegatedAvailabilityCheckMap();
if (!map.empty() && feature->RequiresDelegatedAvailabilityCheck()) {
auto* handler = base::FindOrNull(map, feature->name());
if (handler && !handler->is_null()) {
feature->SetDelegatedAvailabilityCheckHandler(*handler);
}
}
features_[std::string(name)] = std::move(feature);
}
void FeatureProvider::AddFeature(std::string_view name, Feature* feature) {
AddFeature(name, base::WrapUnique(feature));
}
} // namespace extensions
|
