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
|
'use strict'
const {Transform} = require('stream')
const {MESSAGES} = require('./statuses')
// https://gemini.circumlunar.space/docs/spec-spec.txt, 1.2
// > Gemini requests are a single CRLF-terminated line with the
// > following structure: <URL><CR><LF>
// > <URL> is a UTF-8 encoded absolute URL, of maximum length
// > 1024 bytes. [...]
const CRLF = '\r\n'
const MAX_HEADER_SIZE = 1024 + CRLF.length
const createRequestParser = () => {
let headerParsed = false
let peek = Buffer.alloc(0)
const invalid = () => {
peek = null
out.destroy(new Error('invalid Gemini request'))
}
const onData = (data) => {
if (headerParsed) {
out.push(data)
return;
}
peek = Buffer.concat([peek, data], peek.length + data.length)
if (
data.indexOf(CRLF) < 0 &&
peek.length < MAX_HEADER_SIZE
) return; // keep peeking
const iCRLF = peek.indexOf(CRLF)
if (iCRLF < 0) return invalid()
const url = peek.slice(0, iCRLF).toString('utf8')
headerParsed = true
out.emit('header', {url})
const iBody = iCRLF + 2
if (peek.length > (iBody + 1)) {
// `data` contains the beginning of the body
out.push(peek.slice(iBody))
}
peek = null // allow garbage collection
}
const out = new Transform({
write: (chunk, _, cb) => {
onData(chunk)
cb()
},
writev: (chunks, cb) => {
for (let i = 0; i < chunks.length; i++) {
onData(chunks[i].chunk)
}
cb()
},
})
return out
}
// const p = createRequestParser()
// p.on('error', console.error)
// p.on('header', h => console.log('header', h))
// p.on('data', d => console.log('data', d.toString('utf8')))
// const b = str => Buffer.from(str, 'utf8')
// p.write(b('gemini://examp'))
// p.write(b('le.org/foo?bar#baz\r\nhel'))
// p.end(b('lo server!'))
module.exports = createRequestParser
|
