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,const ApiListFilter & api_list_filter)27 HiddenApi::HiddenApi(const char* filename, const ApiListFilter& api_list_filter)
28 : api_list_filter_(api_list_filter) {
29 CHECK(filename != nullptr);
30
31 std::ifstream in(filename);
32 bool errors = false;
33 for (std::string str; std::getline(in, str);) {
34 std::vector<std::string> values = android::base::Split(str, ",");
35 const std::string& signature = values[0];
36
37 hiddenapi::ApiList membership;
38 bool success = hiddenapi::ApiList::FromNames(values.begin() + 1, values.end(), &membership);
39 if (!success) {
40 LOG(ERROR) << "Unknown ApiList flag: " << str;
41 errors = true;
42 continue;
43 } else if (!membership.IsValid()) {
44 LOG(ERROR) << "Invalid ApiList: " << membership;
45 errors = true;
46 continue;
47 }
48
49 AddSignatureToApiList(signature, membership);
50 size_t pos = signature.find("->");
51 if (pos != std::string::npos) {
52 // Add the class name.
53 AddSignatureToApiList(signature.substr(0, pos), membership);
54 pos = signature.find('(');
55 if (pos != std::string::npos) {
56 // Add the class->method name (so stripping the signature).
57 AddSignatureToApiList(signature.substr(0, pos), membership);
58 }
59 pos = signature.find(':');
60 if (pos != std::string::npos) {
61 // Add the class->field name (so stripping the type).
62 AddSignatureToApiList(signature.substr(0, pos), membership);
63 }
64 }
65 }
66 CHECK(!errors) << "Errors encountered while parsing file " << filename;
67 }
68
AddSignatureToApiList(const std::string & signature,hiddenapi::ApiList membership)69 void HiddenApi::AddSignatureToApiList(const std::string& signature, hiddenapi::ApiList membership) {
70 auto it = api_list_.find(signature);
71 if (it == api_list_.end()) {
72 // Does not exist yet. Add it to list.
73 api_list_.emplace(signature, membership);
74 } else if (membership.GetMaxAllowedSdkVersion() < it->second.GetMaxAllowedSdkVersion()) {
75 // Already exist but `membership` is more restrictive.
76 it->second = membership;
77 } else {
78 // Already exists and `membership` is equally or less restrictive.
79 }
80 }
81
GetApiMethodName(const DexFile & dex_file,uint32_t method_index)82 std::string HiddenApi::GetApiMethodName(const DexFile& dex_file, uint32_t method_index) {
83 std::stringstream ss;
84 const dex::MethodId& method_id = dex_file.GetMethodId(method_index);
85 ss << dex_file.GetTypeDescriptorView(method_id.class_idx_)
86 << "->"
87 << dex_file.GetMethodName(method_id)
88 << dex_file.GetMethodSignature(method_id).ToString();
89 return ss.str();
90 }
91
GetApiFieldName(const DexFile & dex_file,uint32_t field_index)92 std::string HiddenApi::GetApiFieldName(const DexFile& dex_file, uint32_t field_index) {
93 std::stringstream ss;
94 const dex::FieldId& field_id = dex_file.GetFieldId(field_index);
95 ss << dex_file.GetTypeDescriptorView(field_id.class_idx_)
96 << "->"
97 << dex_file.GetFieldName(field_id)
98 << ":"
99 << dex_file.GetFieldTypeDescriptor(field_id);
100 return ss.str();
101 }
102
103 } // namespace art
104