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
|
// Copyright 2020 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/browser/api/declarative_net_request/global_rules_tracker.h"
#include "extensions/browser/api/declarative_net_request/prefs_helper.h"
#include "extensions/browser/api/declarative_net_request/utils.h"
#include "extensions/browser/extension_prefs.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/api/declarative_net_request.h"
#include "extensions/common/extension.h"
namespace extensions::declarative_net_request {
namespace {
namespace dnr_api = api::declarative_net_request;
// Returns the total allocated global rule count, as maintained in extension
// prefs from the set of installed extensions in the registry.
size_t CalculateAllocatedGlobalRuleCount(
ExtensionPrefs* extension_prefs,
const ExtensionRegistry* extension_registry) {
const ExtensionSet installed_extensions =
extension_registry->GenerateInstalledExtensionsSet();
const PrefsHelper helper(*extension_prefs);
// For each extension, fetch its allocated rules count and add it to
// |allocated_global_rule_count_|.
size_t allocated_global_rule_count = 0;
for (const auto& extension : installed_extensions) {
int allocated_rule_count = 0;
if (helper.GetAllocatedGlobalRuleCount(extension->id(),
allocated_rule_count)) {
allocated_global_rule_count += allocated_rule_count;
}
}
return allocated_global_rule_count;
}
// Returns the total allocated global rule count, as maintained in extension
// prefs from the set of installed extensions from prefs. This should be called
// only if the extension registry has not been populated yet (e.g. when a
// browser session has just started).
size_t CalculateInitialAllocatedGlobalRuleCount(
ExtensionPrefs* extension_prefs) {
const ExtensionPrefs::ExtensionsInfo extensions_info =
extension_prefs->GetInstalledExtensionsInfo();
const PrefsHelper helper(*extension_prefs);
// For each extension, fetch its allocated rules count and add it to
// |allocated_global_rule_count_|.
size_t allocated_global_rule_count = 0;
for (const auto& info : extensions_info) {
// Skip extensions that were loaded from the command-line because we don't
// want those to persist across browser restart.
if (info.extension_location == mojom::ManifestLocation::kCommandLine) {
continue;
}
int allocated_rule_count = 0;
if (helper.GetAllocatedGlobalRuleCount(info.extension_id,
allocated_rule_count)) {
allocated_global_rule_count += allocated_rule_count;
}
}
return allocated_global_rule_count;
}
} // namespace
GlobalRulesTracker::GlobalRulesTracker(ExtensionPrefs* extension_prefs,
ExtensionRegistry* extension_registry)
: allocated_global_rule_count_(
CalculateInitialAllocatedGlobalRuleCount(extension_prefs)),
extension_prefs_(extension_prefs),
extension_registry_(extension_registry) {}
GlobalRulesTracker::~GlobalRulesTracker() = default;
size_t GlobalRulesTracker::GetAllocatedGlobalRuleCountForTesting() const {
DCHECK_EQ(
allocated_global_rule_count_,
CalculateAllocatedGlobalRuleCount(extension_prefs_, extension_registry_));
return allocated_global_rule_count_;
}
bool GlobalRulesTracker::OnExtensionRuleCountUpdated(
const ExtensionId& extension_id,
size_t new_rule_count) {
// Each extension ruleset is allowed to have up to
// |GetMaximumRulesPerRuleset()| rules during indexing.
DCHECK_LE(new_rule_count, static_cast<size_t>(GetMaximumRulesPerRuleset()) *
dnr_api::MAX_NUMBER_OF_STATIC_RULESETS);
PrefsHelper helper(*extension_prefs_);
bool keep_excess_allocation = helper.GetKeepExcessAllocation(extension_id);
if (new_rule_count <=
static_cast<size_t>(GetStaticGuaranteedMinimumRuleCount())) {
if (!keep_excess_allocation) {
ClearExtensionAllocation(extension_id);
}
return true;
}
size_t old_allocated_rule_count = GetAllocationInPrefs(extension_id);
DCHECK_GE(allocated_global_rule_count_, old_allocated_rule_count);
size_t new_allocated_rule_count =
new_rule_count - GetStaticGuaranteedMinimumRuleCount();
if (new_allocated_rule_count == old_allocated_rule_count) {
return true;
}
if (keep_excess_allocation &&
old_allocated_rule_count > new_allocated_rule_count) {
// Retain the extension's current excess allocation and allow the update.
return true;
}
size_t new_global_rule_count =
(allocated_global_rule_count_ - old_allocated_rule_count) +
new_allocated_rule_count;
// If updating this extension's rule count would cause the global rule count
// to be exceeded, don't commit the update and return false.
if (new_global_rule_count > static_cast<size_t>(GetGlobalStaticRuleLimit())) {
return false;
}
if (keep_excess_allocation) {
DCHECK_GT(new_allocated_rule_count, old_allocated_rule_count);
// The extension is now using more than its pre-update rule allocation.
// Remove its ability to keep the excess allocation.
helper.SetKeepExcessAllocation(extension_id, false);
}
allocated_global_rule_count_ = new_global_rule_count;
helper.SetAllocatedGlobalRuleCount(extension_id, new_allocated_rule_count);
return true;
}
size_t GlobalRulesTracker::GetUnallocatedRuleCount() const {
return GetGlobalStaticRuleLimit() - allocated_global_rule_count_;
}
size_t GlobalRulesTracker::GetAvailableAllocation(
const ExtensionId& extension_id) const {
return GetUnallocatedRuleCount() + GetAllocationInPrefs(extension_id);
}
void GlobalRulesTracker::ClearExtensionAllocation(
const ExtensionId& extension_id) {
int allocated_rule_count = 0;
PrefsHelper helper(*extension_prefs_);
if (!helper.GetAllocatedGlobalRuleCount(extension_id, allocated_rule_count)) {
return;
}
DCHECK_GE(allocated_global_rule_count_,
static_cast<size_t>(allocated_rule_count));
allocated_global_rule_count_ -= allocated_rule_count;
helper.SetAllocatedGlobalRuleCount(extension_id,
/*rule_count=*/0);
}
size_t GlobalRulesTracker::GetAllocationInPrefs(
const ExtensionId& extension_id) const {
const PrefsHelper helper(*extension_prefs_);
int allocated_rule_count = 0;
helper.GetAllocatedGlobalRuleCount(extension_id, allocated_rule_count);
return allocated_rule_count;
}
} // namespace extensions::declarative_net_request
|
