/
wget.go
150 lines (126 loc) · 3.05 KB
/
wget.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
147
148
149
150
//
// mimixbox/internal/applets/shellutils/wget/wget.go
//
// Copyright 2021 Naohiro CHIKAMATSU
//
// 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 wget
import (
"fmt"
"io"
"net/http"
"net/url"
"os"
"path"
"strconv"
"github.com/jessevdk/go-flags"
mb "github.com/nao1215/mimixbox/internal/lib"
)
const cmdName string = "wget"
const version = "1.0.0"
var osExit = os.Exit
type options struct {
Version bool `short:"v" long:"version" description:"Show wget command version"`
}
func Run() (int, error) {
var opts options
var args []string
var err error
if args, err = parseArgs(&opts); err != nil {
return mb.ExitFailure, nil
}
return wget(args)
}
func wget(args []string) (int, error) {
status := mb.ExitSuccess
for _, v := range args {
target, err := openTargetFile(v)
if err != nil {
fmt.Fprintln(os.Stderr, cmdName+": "+err.Error()+": v")
status = mb.ExitFailure
continue
}
defer target.Close()
client := http.Client{}
response, err := client.Get(v)
if err != nil {
fmt.Fprintln(os.Stderr, cmdName+": "+err.Error()+": v")
status = mb.ExitFailure
continue
}
defer response.Body.Close()
_, err = io.Copy(target, response.Body)
if err != nil {
fmt.Fprintln(os.Stderr, cmdName+": "+err.Error()+": v")
status = mb.ExitFailure
continue
}
}
return status, nil
}
func openTargetFile(urlStr string) (io.WriteCloser, error) {
filename, err := targetFilename(urlStr)
if err != nil {
return nil, err
}
return os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0644)
}
func targetFilename(urlStr string) (string, error) {
url, err := url.Parse(urlStr)
if err != nil {
return "", err
}
filename := path.Base(url.Path)
if len(filename) == 0 || filename == "." {
filename = "index.html"
}
return preventFilenameDup(filename), nil
}
func preventFilenameDup(filename string) string {
if !mb.IsFile(filename) {
return filename
}
i := 1
for {
newName := filename + "." + strconv.Itoa(i)
if !mb.IsFile(newName) {
return newName
}
i++
}
}
func parseArgs(opts *options) ([]string, error) {
p := initParser(opts)
args, err := p.Parse()
if err != nil {
return nil, err
}
if opts.Version {
mb.ShowVersion(cmdName, version)
osExit(mb.ExitSuccess)
}
if !isValidArgNr(args) {
fmt.Fprintln(os.Stderr, "wget: missing URL")
osExit(mb.ExitFailure)
}
return args, nil
}
func initParser(opts *options) *flags.Parser {
parser := flags.NewParser(opts, flags.Default)
parser.Name = cmdName
parser.Usage = "[OPTIONS] URL"
return parser
}
func isValidArgNr(args []string) bool {
return len(args) >= 1
}