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
151
152
153
|
package gopherproxy
import (
"bufio"
"crypto/tls"
"errors"
"io"
"mime"
"net/url"
"regexp"
"strconv"
"strings"
)
const (
CRLF = "\r\n"
)
const (
STATUS_INPUT = 10
STATUS_SUCCESS = 20
STATUS_SUCCESS_CERT = 21
STATUS_REDIRECT_TEMP = 30
STATUS_REDIRECT_PERM = 31
STATUS_TEMP_FAILURE = 40
STATUS_SERVER_UNAVAILABLE = 41
STATUS_CGI_ERROR = 42
STATUS_PROXY_ERROR = 43
STATUS_SLOW_DOWN = 44
STATUS_PERM_FAILURE = 50
STATUS_NOT_FOUND = 51
STATUS_GONE = 52
STATUS_PROXY_REFUSED = 53
STATUS_BAD_REQUEST = 59
STATUS_CLIENT_CERT_EXPIRED = 60
STATUS_TRANSIENT_CERT_REQUEST = 61
STATUS_AUTH_CERT_REQUIRED = 62
STATUS_CERT_REJECTED = 63
STATUS_FUTURE_CERT_REJECTED = 64
STATUS_EXPIRED_CERT_REJECTED = 65
)
const (
MIME_GEMINI = "text/gemini"
DEFAULT_MIME = MIME_GEMINI
DEFAULT_CHARSET = "utf-8"
)
var (
HeaderPattern = regexp.MustCompile("^(\\d\\d)[ \\t]+(.*)$")
GeminiLinkPattern = regexp.MustCompile("^=>[ \\t]*([^ \\t]+)(?:[ \\t]+(.*))?$")
)
type GeminiHeader struct {
Status int
Meta string
}
type GeminiResponse struct {
Header *GeminiHeader
Body io.Reader
}
func GeminiGet(uri string) (*GeminiResponse, error) {
u, err := url.Parse(uri)
if err != nil {
return nil, err
}
if u.Scheme != "gemini" {
return nil, errors.New("invalid scheme for uri")
}
var (
host string
port int
)
hostport := strings.Split(u.Host, ":")
if len(hostport) == 2 {
host = hostport[0]
n, err := strconv.ParseInt(hostport[1], 10, 32)
if err != nil {
return nil, err
}
port = int(n)
} else {
host, port = hostport[0], 1965
}
conn, err := tls.Dial("tcp", host+":"+strconv.Itoa(port), &tls.Config{
MinVersion: tls.VersionTLS12,
InsecureSkipVerify: true,
})
if err != nil {
return nil, err
}
_, err = conn.Write([]byte(u.String() + CRLF))
if err != nil {
conn.Close()
return nil, err
}
reader := bufio.NewReader(conn)
line, _, err := reader.ReadLine()
if err != nil {
conn.Close()
return nil, err
}
header, err := ParseGeminiHeader(string(line))
if err != nil {
conn.Close()
return nil, err
}
return &GeminiResponse{
Header: header,
Body: reader,
}, nil
}
func ParseGeminiHeader(line string) (header *GeminiHeader, err error) {
matches := HeaderPattern.FindStringSubmatch(line)
status, err := strconv.Atoi(matches[1])
if err != nil {
return nil, err
}
meta := matches[2]
if int(status/10) == 2 {
mediaType, params, err := mime.ParseMediaType(meta)
if err != nil {
meta = DEFAULT_MIME + ";charset=" + DEFAULT_CHARSET
} else if strings.HasPrefix(mediaType, "text/") {
if _, ok := params["charset"]; !ok {
meta += ";charset=" + DEFAULT_CHARSET
}
}
}
header = &GeminiHeader{
Status: status,
Meta: meta,
}
return
}
|
