1// Copyright 2013 The Flutter Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "flutter/fml/file.h"
6
7#include "flutter/fml/logging.h"
8#include "flutter/fml/unique_fd.h"
9
10namespace fml {
11
12static fml::UniqueFD CreateDirectory(const fml::UniqueFD& base_directory,
13 const std::vector<std::string>& components,
14 FilePermission permission,
15 size_t index) {
16 FML_DCHECK(index <= components.size());
17
18 const char* file_path = components[index].c_str();
19
20 auto directory = OpenDirectory(base_directory, path: file_path, create_if_necessary: true, permission);
21
22 if (!directory.is_valid()) {
23 return {};
24 }
25
26 if (index == components.size() - 1) {
27 return directory;
28 }
29
30 return CreateDirectory(base_directory: directory, components, permission, index: index + 1);
31}
32
33fml::UniqueFD CreateDirectory(const fml::UniqueFD& base_directory,
34 const std::vector<std::string>& components,
35 FilePermission permission) {
36 if (!IsDirectory(directory: base_directory)) {
37 return {};
38 }
39
40 if (components.empty()) {
41 return {};
42 }
43
44 return CreateDirectory(base_directory, components, permission, index: 0);
45}
46
47ScopedTemporaryDirectory::ScopedTemporaryDirectory()
48 : path_(CreateTemporaryDirectory()) {
49 if (path_ != "") {
50 dir_fd_ = OpenDirectory(path: path_.c_str(), create_if_necessary: false, permission: FilePermission::kRead);
51 }
52}
53
54ScopedTemporaryDirectory::~ScopedTemporaryDirectory() {
55 // POSIX requires the directory to be empty before UnlinkDirectory.
56 if (path_ != "") {
57 if (!RemoveFilesInDirectory(directory: dir_fd_)) {
58 FML_LOG(ERROR) << "Could not clean directory: " << path_;
59 }
60 }
61
62 // Windows has to close UniqueFD first before UnlinkDirectory
63 dir_fd_.reset();
64 if (path_ != "") {
65 if (!UnlinkDirectory(path: path_.c_str())) {
66 FML_LOG(ERROR) << "Could not remove directory: " << path_;
67 }
68 }
69}
70
71bool VisitFilesRecursively(const fml::UniqueFD& directory,
72 const FileVisitor& visitor) {
73 FileVisitor recursive_visitor = [&recursive_visitor, &visitor](
74 const UniqueFD& directory,
75 const std::string& filename) {
76 if (!visitor(directory, filename)) {
77 return false;
78 }
79 if (IsDirectory(base_directory: directory, path: filename.c_str())) {
80 UniqueFD sub_dir = OpenDirectoryReadOnly(base_directory: directory, path: filename.c_str());
81 if (!sub_dir.is_valid()) {
82 FML_LOG(ERROR) << "Can't open sub-directory: " << filename;
83 return true;
84 }
85 return VisitFiles(directory: sub_dir, visitor: recursive_visitor);
86 }
87 return true;
88 };
89 return VisitFiles(directory, visitor: recursive_visitor);
90}
91
92fml::UniqueFD OpenFileReadOnly(const fml::UniqueFD& base_directory,
93 const char* path) {
94 return OpenFile(base_directory, path, create_if_necessary: false, permission: FilePermission::kRead);
95}
96
97fml::UniqueFD OpenDirectoryReadOnly(const fml::UniqueFD& base_directory,
98 const char* path) {
99 return OpenDirectory(base_directory, path, create_if_necessary: false, permission: FilePermission::kRead);
100}
101
102bool RemoveFilesInDirectory(const fml::UniqueFD& directory) {
103 fml::FileVisitor recursive_cleanup = [&recursive_cleanup](
104 const fml::UniqueFD& directory,
105 const std::string& filename) {
106 bool removed;
107 if (fml::IsDirectory(base_directory: directory, path: filename.c_str())) {
108 fml::UniqueFD sub_dir =
109 OpenDirectoryReadOnly(base_directory: directory, path: filename.c_str());
110 removed = VisitFiles(directory: sub_dir, visitor: recursive_cleanup) &&
111 fml::UnlinkDirectory(base_directory: directory, path: filename.c_str());
112 } else {
113 removed = fml::UnlinkFile(base_directory: directory, path: filename.c_str());
114 }
115 return removed;
116 };
117 return VisitFiles(directory, visitor: recursive_cleanup);
118}
119
120bool RemoveDirectoryRecursively(const fml::UniqueFD& parent,
121 const char* directory_name) {
122 auto dir = fml::OpenDirectory(base_directory: parent, path: directory_name, create_if_necessary: false,
123 permission: fml::FilePermission::kReadWrite);
124 return RemoveFilesInDirectory(directory: dir) && UnlinkDirectory(base_directory: parent, path: directory_name);
125}
126
127} // namespace fml
128

source code of flutter_engine/flutter/fml/file.cc