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