/
file.go
146 lines (132 loc) · 3.16 KB
/
file.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
// Copyright 2022 Antrea Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package file
import (
"archive/tar"
"compress/gzip"
"context"
"fmt"
"io"
"io/fs"
"net/http"
"os"
"path"
"path/filepath"
"strings"
"github.com/go-logr/logr"
)
const maxCopySize = 100 * 1024 * 1024 // Limit to 100 MB
func Download(ctx context.Context, logger logr.Logger, url string, dir string, filename string) (string, error) {
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
return "", err
}
client := http.DefaultClient
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
if filename == "" {
filename = path.Base(req.URL.Path)
}
dest := filepath.Join(dir, filename)
logger.V(4).Info("Downloading", "path", dest)
file, err := os.Create(dest)
if err != nil {
return "", err
}
defer file.Close()
_, err = io.Copy(file, resp.Body)
return dest, err
}
func DownloadAndUntar(ctx context.Context, logger logr.Logger, url string, dir string) error {
tarFilepath, err := Download(ctx, logger, url, dir, "")
if err != nil {
return err
}
f, err := os.Open(tarFilepath)
if err != nil {
return err
}
defer f.Close()
gzr, err := gzip.NewReader(f)
if err != nil {
return err
}
defer gzr.Close()
tr := tar.NewReader(gzr)
for {
hdr, err := tr.Next()
if err == io.EOF {
break // End of archive
}
if err != nil {
return err
}
dest := filepath.Join(dir, filepath.Clean(hdr.Name))
if strings.Contains(dest, "..") {
return fmt.Errorf("illegal path: %s, potential directory traversal detected", dest)
}
logger.V(4).Info("Untarring", "path", hdr.Name)
if hdr.Typeflag != tar.TypeReg {
continue
}
if err := func() error {
f, err := os.OpenFile(dest, os.O_CREATE|os.O_RDWR, os.FileMode(hdr.Mode))
if err != nil {
return err
}
defer f.Close()
// copy over contents
if _, err := io.Copy(f, io.LimitReader(tr, maxCopySize)); err != nil {
return err
}
return nil
}(); err != nil {
return err
}
}
return nil
}
func WriteFSDirToDisk(fsys fs.FS, fsysPath string, dest string) error {
if err := os.MkdirAll(dest, 0755); err != nil {
return err
}
return fs.WalkDir(fsys, fsysPath, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
outpath := filepath.Join(dest, strings.TrimPrefix(path, fsysPath))
if d.IsDir() {
os.MkdirAll(outpath, 0755)
return nil
}
in, err := fsys.Open(path)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(outpath)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
if err != nil {
return err
}
return nil
})
}