1 /*
2 * Copyright (c) 2022-2023 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 "symlink.h"
17
18 #include <cstring>
19 #include <fcntl.h>
20 #include <tuple>
21 #include <unistd.h>
22
23 #include "common_func.h"
24 #include "filemgmt_libhilog.h"
25
26 namespace OHOS {
27 namespace FileManagement {
28 namespace ModuleFileIO {
29 using namespace std;
30 using namespace OHOS::FileManagement::LibN;
31
GetSymlinkArg(napi_env env,const NFuncArg & funcArg)32 static tuple<bool, string, string> GetSymlinkArg(napi_env env, const NFuncArg &funcArg)
33 {
34 auto [resGetFirstArg, src, unused] = NVal(env, funcArg[NARG_POS::FIRST]).ToUTF8StringPath();
35 if (!resGetFirstArg) {
36 return { false, "", "" };
37 }
38
39 auto [resGetSecondArg, dest, useless] = NVal(env, funcArg[NARG_POS::SECOND]).ToUTF8StringPath();
40 if (!resGetSecondArg) {
41 return { false, "", "" };
42 }
43
44 return { true, src.get(), dest.get() };
45 }
46
Sync(napi_env env,napi_callback_info info)47 napi_value Symlink::Sync(napi_env env, napi_callback_info info)
48 {
49 NFuncArg funcArg(env, info);
50 if (!funcArg.InitArgs(NARG_CNT::TWO)) {
51 HILOGE("Number of arguments unmatched");
52 NError(EINVAL).ThrowErr(env);
53 return nullptr;
54 }
55
56 auto [resGetSymlinkArg, oldPath, newPath] = GetSymlinkArg(env, funcArg);
57 if (!resGetSymlinkArg) {
58 HILOGE("Failed to get symlink arguments");
59 NError(EINVAL).ThrowErr(env);
60 return nullptr;
61 }
62
63 std::unique_ptr<uv_fs_t, decltype(CommonFunc::fs_req_cleanup)*> symlink_req = {
64 new uv_fs_t, CommonFunc::fs_req_cleanup };
65 if (!symlink_req) {
66 HILOGE("Failed to request heap memory.");
67 NError(ENOMEM).ThrowErr(env);
68 return nullptr;
69 }
70 int ret = uv_fs_symlink(nullptr, symlink_req.get(), oldPath.c_str(), newPath.c_str(), 0, nullptr);
71 if (ret < 0) {
72 HILOGE("Failed to create a link for old path");
73 NError(ret).ThrowErr(env);
74 return nullptr;
75 }
76
77 return NVal::CreateUndefined(env).val_;
78 }
79
Async(napi_env env,napi_callback_info info)80 napi_value Symlink::Async(napi_env env, napi_callback_info info)
81 {
82 NFuncArg funcArg(env, info);
83 if (!funcArg.InitArgs(NARG_CNT::TWO, NARG_CNT::THREE)) {
84 HILOGE("Number of arguments unmatched");
85 NError(EINVAL).ThrowErr(env);
86 return nullptr;
87 }
88
89 auto [resGetSymlinkArg, oldPath, newPath] = GetSymlinkArg(env, funcArg);
90 if (!resGetSymlinkArg) {
91 HILOGE("Failed to get symlink arguments");
92 NError(EINVAL).ThrowErr(env);
93 return nullptr;
94 }
95
96 auto cbExec = [oldPath = move(oldPath), newPath = move(newPath)]() -> NError {
97 std::unique_ptr<uv_fs_t, decltype(CommonFunc::fs_req_cleanup)*> symlink_req = {
98 new uv_fs_t, CommonFunc::fs_req_cleanup };
99 if (!symlink_req) {
100 HILOGE("Failed to request heap memory.");
101 return NError(ENOMEM);
102 }
103 int ret = uv_fs_symlink(nullptr, symlink_req.get(), oldPath.c_str(), newPath.c_str(), 0, nullptr);
104 if (ret < 0) {
105 HILOGE("Failed to create a link for old path");
106 return NError(ret);
107 }
108 return NError(ERRNO_NOERR);
109 };
110
111 auto cbComplCallback = [](napi_env env, NError err) -> NVal {
112 if (err) {
113 return { env, err.GetNapiErr(env) };
114 }
115 return { NVal::CreateUndefined(env) };
116 };
117
118 NVal thisVar(env, funcArg.GetThisVar());
119 size_t argc = funcArg.GetArgc();
120 if (argc == NARG_CNT::TWO) {
121 return NAsyncWorkPromise(env, thisVar).Schedule(PROCEDURE_SYMLINK_NAME, cbExec, cbComplCallback).val_;
122 } else {
123 NVal cb(env, funcArg[NARG_POS::THIRD]);
124 return NAsyncWorkCallback(env, thisVar, cb).Schedule(PROCEDURE_SYMLINK_NAME, cbExec, cbComplCallback).val_;
125 }
126 }
127 } // namespace ModuleFileIO
128 } // namespace FileManagement
129 } // namespace OHOS
130