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
|
'use strict'
const EventEmitter = require('node:events').EventEmitter
const inherits = require('node:util').inherits
const getLimit = require('../../../lib/utils/getLimit')
const StreamSearch = require('../../streamsearch/sbmh')
const B_DCRLF = Buffer.from('\r\n\r\n')
const RE_CRLF = /\r\n/g
const RE_HDR = /^([^:]+):[ \t]?([\x00-\xFF]+)?$/ // eslint-disable-line no-control-regex
function HeaderParser (cfg) {
EventEmitter.call(this)
cfg = cfg || {}
const self = this
this.nread = 0
this.maxed = false
this.npairs = 0
this.maxHeaderPairs = getLimit(cfg, 'maxHeaderPairs', 2000)
this.maxHeaderSize = getLimit(cfg, 'maxHeaderSize', 80 * 1024)
this.buffer = ''
this.header = {}
this.finished = false
this.ss = new StreamSearch(B_DCRLF)
this.ss.on('info', function (isMatch, data, start, end) {
if (data && !self.maxed) {
if (self.nread + end - start >= self.maxHeaderSize) {
end = self.maxHeaderSize - self.nread + start
self.nread = self.maxHeaderSize
self.maxed = true
} else { self.nread += (end - start) }
self.buffer += data.toString('binary', start, end)
}
if (isMatch) { self._finish() }
})
}
inherits(HeaderParser, EventEmitter)
HeaderParser.prototype.push = function (data) {
const r = this.ss.push(data)
if (this.finished) { return r }
}
HeaderParser.prototype.reset = function () {
this.finished = false
this.buffer = ''
this.header = {}
this.ss.reset()
}
HeaderParser.prototype._finish = function () {
if (this.buffer) { this._parseHeader() }
this.ss.matches = this.ss.maxMatches
const header = this.header
this.header = {}
this.buffer = ''
this.finished = true
this.nread = this.npairs = 0
this.maxed = false
this.emit('header', header)
}
HeaderParser.prototype._parseHeader = function () {
if (this.npairs === this.maxHeaderPairs) { return }
const lines = this.buffer.split(RE_CRLF)
const len = lines.length
let m, h
for (var i = 0; i < len; ++i) { // eslint-disable-line no-var
if (lines[i].length === 0) { continue }
if (lines[i][0] === '\t' || lines[i][0] === ' ') {
// folded header content
// RFC2822 says to just remove the CRLF and not the whitespace following
// it, so we follow the RFC and include the leading whitespace ...
if (h) {
this.header[h][this.header[h].length - 1] += lines[i]
continue
}
}
const posColon = lines[i].indexOf(':')
if (
posColon === -1 ||
posColon === 0
) {
return
}
m = RE_HDR.exec(lines[i])
h = m[1].toLowerCase()
this.header[h] = this.header[h] || []
this.header[h].push((m[2] || ''))
if (++this.npairs === this.maxHeaderPairs) { break }
}
}
module.exports = HeaderParser
|
