-
Notifications
You must be signed in to change notification settings - Fork 1
/
dove.go
96 lines (78 loc) · 1.61 KB
/
dove.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
package dove
import (
"bufio"
"bytes"
"encoding/base64"
"errors"
"io"
"io/fs"
"net/http"
"os"
"strings"
)
const (
_FILE = 0x01
_HTTP = 0x02
_HTTPS = 0x04
_BASE64 = 0x08
)
type tinfo struct {
no int
file *os.File
response *http.Response
bases []byte
}
func Fly(url string, bsize int, f func(rd *bufio.Reader, objs ...interface{}) error, objs ...interface{}) (err error) {
reader, err := getReader(url)
if err != nil {
return err
}
defer reader.Close()
if bsize <= 0 {
bsize = 4096
}
return f(bufio.NewReaderSize(reader, bsize), objs...)
}
func getReader(url string) (io.ReadCloser, error) {
info, err := guess(url)
if err != nil {
return nil, err
}
switch info.no {
case _HTTP:
return info.response.Body, nil
case _HTTPS:
return info.response.Body, nil
case _BASE64:
return io.NopCloser(bytes.NewReader(info.bases)), nil
case _FILE:
return info.file, nil
}
return nil, errors.New("unsupport type")
}
func guess(url string) (tinfo, error) {
if strings.HasPrefix(url, "https://") {
resp, err := http.Get(url)
if err != nil {
return tinfo{}, err
}
return tinfo{no: _HTTPS, response: resp}, nil
}
if strings.HasPrefix(url, "http://") {
resp, err := http.Get(url)
if err != nil {
return tinfo{}, err
}
return tinfo{no: _HTTP, response: resp}, nil
}
if f, err := os.Open(url); !errors.Is(err, fs.ErrNotExist) {
return tinfo{no: _FILE, file: f}, nil
} else if err != nil {
return tinfo{}, err
}
if s, err := base64.StdEncoding.DecodeString(url); err == nil {
return tinfo{no: _BASE64, bases: s}, nil
} else {
return tinfo{}, err
}
}