shell bypass 403
'use strict'
var asciiAlpha = require('../character/ascii-alpha.js')
var asciiAlphanumeric = require('../character/ascii-alphanumeric.js')
var asciiAtext = require('../character/ascii-atext.js')
var asciiControl = require('../character/ascii-control.js')
var autolink = {
name: 'autolink',
tokenize: tokenizeAutolink
}
function tokenizeAutolink(effects, ok, nok) {
var size = 1
return start
function start(code) {
effects.enter('autolink')
effects.enter('autolinkMarker')
effects.consume(code)
effects.exit('autolinkMarker')
effects.enter('autolinkProtocol')
return open
}
function open(code) {
if (asciiAlpha(code)) {
effects.consume(code)
return schemeOrEmailAtext
}
return asciiAtext(code) ? emailAtext(code) : nok(code)
}
function schemeOrEmailAtext(code) {
return code === 43 || code === 45 || code === 46 || asciiAlphanumeric(code)
? schemeInsideOrEmailAtext(code)
: emailAtext(code)
}
function schemeInsideOrEmailAtext(code) {
if (code === 58) {
effects.consume(code)
return urlInside
}
if (
(code === 43 || code === 45 || code === 46 || asciiAlphanumeric(code)) &&
size++ < 32
) {
effects.consume(code)
return schemeInsideOrEmailAtext
}
return emailAtext(code)
}
function urlInside(code) {
if (code === 62) {
effects.exit('autolinkProtocol')
return end(code)
}
if (code === 32 || code === 60 || asciiControl(code)) {
return nok(code)
}
effects.consume(code)
return urlInside
}
function emailAtext(code) {
if (code === 64) {
effects.consume(code)
size = 0
return emailAtSignOrDot
}
if (asciiAtext(code)) {
effects.consume(code)
return emailAtext
}
return nok(code)
}
function emailAtSignOrDot(code) {
return asciiAlphanumeric(code) ? emailLabel(code) : nok(code)
}
function emailLabel(code) {
if (code === 46) {
effects.consume(code)
size = 0
return emailAtSignOrDot
}
if (code === 62) {
// Exit, then change the type.
effects.exit('autolinkProtocol').type = 'autolinkEmail'
return end(code)
}
return emailValue(code)
}
function emailValue(code) {
if ((code === 45 || asciiAlphanumeric(code)) && size++ < 63) {
effects.consume(code)
return code === 45 ? emailValue : emailLabel
}
return nok(code)
}
function end(code) {
effects.enter('autolinkMarker')
effects.consume(code)
effects.exit('autolinkMarker')
effects.exit('autolink')
return ok
}
}
module.exports = autolink