1/*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include "json_parser.h"
17
18#include <fcntl.h>
19#include <memory>
20#include <sys/stat.h>
21#include <sys/types.h>
22#include <unistd.h>
23
24#include "accesstoken_log.h"
25#include "access_token_error.h"
26#include "access_token.h"
27
28namespace OHOS {
29namespace Security {
30namespace AccessToken {
31namespace {
32static constexpr OHOS::HiviewDFX::HiLogLabel LABEL = {LOG_CORE, SECURITY_DOMAIN_ACCESSTOKEN, "JsonParser"};
33constexpr int MAX_NATIVE_CONFIG_FILE_SIZE = 5 * 1024 * 1024; // 5M
34constexpr size_t BUFFER_SIZE = 1024;
35}
36
37bool JsonParser::GetStringFromJson(const nlohmann::json& j, const std::string& tag, std::string& out)
38{
39    if (j.find(tag) != j.end() && j.at(tag).is_string()) {
40        out = j.at(tag).get<std::string>();
41        return true;
42    }
43    return false;
44}
45
46bool JsonParser::GetIntFromJson(const nlohmann::json& j, const std::string& tag, int& out)
47{
48    if (j.find(tag) != j.end() && j.at(tag).is_number()) {
49        out = j.at(tag).get<int>();
50        return true;
51    }
52    return false;
53}
54
55bool JsonParser::GetUnsignedIntFromJson(const nlohmann::json& j, const std::string& tag, unsigned int& out)
56{
57    if (j.find(tag) != j.end() && j.at(tag).is_number()) {
58        out = j.at(tag).get<unsigned int>();
59        return true;
60    }
61    return false;
62}
63
64bool JsonParser::GetBoolFromJson(const nlohmann::json& j, const std::string& tag, bool& out)
65{
66    if (j.find(tag) != j.end() && j.at(tag).is_boolean()) {
67        out = j.at(tag).get<bool>();
68        return true;
69    }
70    return false;
71}
72
73int32_t JsonParser::ReadCfgFile(const std::string& file, std::string& rawData)
74{
75    char filePath[PATH_MAX + 1] = {0};
76    if (realpath(file.c_str(), filePath) == NULL) {
77        return ERR_FILE_OPERATE_FAILED;
78    }
79    int32_t fd = open(filePath, O_RDONLY);
80    if (fd < 0) {
81        ACCESSTOKEN_LOG_ERROR(LABEL, "Open failed errno %{public}d.", errno);
82        return ERR_FILE_OPERATE_FAILED;
83    }
84    struct stat statBuffer;
85
86    if (fstat(fd, &statBuffer) != 0) {
87        ACCESSTOKEN_LOG_ERROR(LABEL, "Fstat failed.");
88        close(fd);
89        return ERR_FILE_OPERATE_FAILED;
90    }
91
92    if (statBuffer.st_size == 0) {
93        ACCESSTOKEN_LOG_ERROR(LABEL, "Config file size is invalid.");
94        close(fd);
95        return ERR_PARAM_INVALID;
96    }
97    if (statBuffer.st_size > MAX_NATIVE_CONFIG_FILE_SIZE) {
98        ACCESSTOKEN_LOG_ERROR(LABEL, "Config file size is too large.");
99        close(fd);
100        return ERR_OVERSIZE;
101    }
102    rawData.reserve(statBuffer.st_size);
103
104    char buff[BUFFER_SIZE] = { 0 };
105    ssize_t readLen = 0;
106    while ((readLen = read(fd, buff, BUFFER_SIZE)) > 0) {
107        rawData.append(buff, readLen);
108    }
109    close(fd);
110    if (readLen == 0) {
111        return RET_SUCCESS;
112    }
113    return ERR_FILE_OPERATE_FAILED;
114}
115
116bool JsonParser::IsDirExsit(const std::string& file)
117{
118    if (file.empty()) {
119        ACCESSTOKEN_LOG_ERROR(LABEL, "File path is empty");
120        return false;
121    }
122
123    struct stat buf;
124    if (stat(file.c_str(), &buf) != 0) {
125        ACCESSTOKEN_LOG_ERROR(LABEL, "Get file attributes failed, errno %{public}d.", errno);
126        return false;
127    }
128
129    if (!S_ISDIR(buf.st_mode)) {
130        ACCESSTOKEN_LOG_ERROR(LABEL, "File mode is not directory.");
131        return false;
132    }
133
134    return true;
135}
136} // namespace AccessToken
137} // namespace Security
138} // namespace OHOS