1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "hidden_api.h"
18
19 #include <fstream>
20 #include <sstream>
21
22 #include "android-base/strings.h"
23 #include "dex/dex_file-inl.h"
24
25 namespace art {
26
HiddenApi(const char * filename,bool sdk_uses_only)27 HiddenApi::HiddenApi(const char* filename, bool sdk_uses_only) {
28 CHECK(filename != nullptr);
29
30 std::ifstream in(filename);
31 for (std::string str; std::getline(in, str);) {
32 std::vector<std::string> values = android::base::Split(str, ",");
33 const std::string& signature = values[0];
34
35 hiddenapi::ApiList membership;
36 bool success = hiddenapi::ApiList::FromNames(values.begin() + 1, values.end(), &membership);
37 CHECK(success) << "Unknown ApiList flag: " << str;
38 CHECK(membership.IsValid()) << "Invalid ApiList: " << membership;
39
40 if (sdk_uses_only != membership.Contains(hiddenapi::ApiList::Whitelist())) {
41 // Either we want only SDK uses and this is not a whitelist entry,
42 // or we want only non-SDK uses and this is a whitelist entry.
43 continue;
44 }
45
46 AddSignatureToApiList(signature, membership);
47 size_t pos = signature.find("->");
48 if (pos != std::string::npos) {
49 // Add the class name.
50 AddSignatureToApiList(signature.substr(0, pos), membership);
51 pos = signature.find('(');
52 if (pos != std::string::npos) {
53 // Add the class->method name (so stripping the signature).
54 AddSignatureToApiList(signature.substr(0, pos), membership);
55 }
56 pos = signature.find(':');
57 if (pos != std::string::npos) {
58 // Add the class->field name (so stripping the type).
59 AddSignatureToApiList(signature.substr(0, pos), membership);
60 }
61 }
62 }
63 }
64
AddSignatureToApiList(const std::string & signature,hiddenapi::ApiList membership)65 void HiddenApi::AddSignatureToApiList(const std::string& signature, hiddenapi::ApiList membership) {
66 auto it = api_list_.find(signature);
67 if (it == api_list_.end()) {
68 // Does not exist yet. Add it to list.
69 api_list_.emplace(signature, membership);
70 } else if (membership.GetMaxAllowedSdkVersion() < it->second.GetMaxAllowedSdkVersion()) {
71 // Already exist but `membership` is more restrictive.
72 it->second = membership;
73 } else {
74 // Already exists and `membership` is equally or less restrictive.
75 }
76 }
77
GetApiMethodName(const DexFile & dex_file,uint32_t method_index)78 std::string HiddenApi::GetApiMethodName(const DexFile& dex_file, uint32_t method_index) {
79 std::stringstream ss;
80 const dex::MethodId& method_id = dex_file.GetMethodId(method_index);
81 ss << dex_file.StringByTypeIdx(method_id.class_idx_)
82 << "->"
83 << dex_file.GetMethodName(method_id)
84 << dex_file.GetMethodSignature(method_id).ToString();
85 return ss.str();
86 }
87
GetApiFieldName(const DexFile & dex_file,uint32_t field_index)88 std::string HiddenApi::GetApiFieldName(const DexFile& dex_file, uint32_t field_index) {
89 std::stringstream ss;
90 const dex::FieldId& field_id = dex_file.GetFieldId(field_index);
91 ss << dex_file.StringByTypeIdx(field_id.class_idx_)
92 << "->"
93 << dex_file.GetFieldName(field_id)
94 << ":"
95 << dex_file.GetFieldTypeDescriptor(field_id);
96 return ss.str();
97 }
98
99 } // namespace art
100