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'use strict'
const Decoder = require('../utils/Decoder')
const decodeText = require('../utils/decodeText')
const getLimit = require('../utils/getLimit')
const RE_CHARSET = /^charset$/i
UrlEncoded.detect = /^application\/x-www-form-urlencoded/i
function UrlEncoded (boy, cfg) {
const limits = cfg.limits
const parsedConType = cfg.parsedConType
this.boy = boy
this.fieldSizeLimit = getLimit(limits, 'fieldSize', 1 * 1024 * 1024)
this.fieldNameSizeLimit = getLimit(limits, 'fieldNameSize', 100)
this.fieldsLimit = getLimit(limits, 'fields', Infinity)
let charset
for (var i = 0, len = parsedConType.length; i < len; ++i) { // eslint-disable-line no-var
if (Array.isArray(parsedConType[i]) &&
RE_CHARSET.test(parsedConType[i][0])) {
charset = parsedConType[i][1].toLowerCase()
break
}
}
if (charset === undefined) { charset = cfg.defCharset || 'utf8' }
this.decoder = new Decoder()
this.charset = charset
this._fields = 0
this._state = 'key'
this._checkingBytes = true
this._bytesKey = 0
this._bytesVal = 0
this._key = ''
this._val = ''
this._keyTrunc = false
this._valTrunc = false
this._hitLimit = false
}
UrlEncoded.prototype.write = function (data, cb) {
if (this._fields === this.fieldsLimit) {
if (!this.boy.hitFieldsLimit) {
this.boy.hitFieldsLimit = true
this.boy.emit('fieldsLimit')
}
return cb()
}
let idxeq; let idxamp; let i; let p = 0; const len = data.length
while (p < len) {
if (this._state === 'key') {
idxeq = idxamp = undefined
for (i = p; i < len; ++i) {
if (!this._checkingBytes) { ++p }
if (data[i] === 0x3D/* = */) {
idxeq = i
break
} else if (data[i] === 0x26/* & */) {
idxamp = i
break
}
if (this._checkingBytes && this._bytesKey === this.fieldNameSizeLimit) {
this._hitLimit = true
break
} else if (this._checkingBytes) { ++this._bytesKey }
}
if (idxeq !== undefined) {
// key with assignment
if (idxeq > p) { this._key += this.decoder.write(data.toString('binary', p, idxeq)) }
this._state = 'val'
this._hitLimit = false
this._checkingBytes = true
this._val = ''
this._bytesVal = 0
this._valTrunc = false
this.decoder.reset()
p = idxeq + 1
} else if (idxamp !== undefined) {
// key with no assignment
++this._fields
let key; const keyTrunc = this._keyTrunc
if (idxamp > p) { key = (this._key += this.decoder.write(data.toString('binary', p, idxamp))) } else { key = this._key }
this._hitLimit = false
this._checkingBytes = true
this._key = ''
this._bytesKey = 0
this._keyTrunc = false
this.decoder.reset()
if (key.length) {
this.boy.emit('field', decodeText(key, 'binary', this.charset),
'',
keyTrunc,
false)
}
p = idxamp + 1
if (this._fields === this.fieldsLimit) { return cb() }
} else if (this._hitLimit) {
// we may not have hit the actual limit if there are encoded bytes...
if (i > p) { this._key += this.decoder.write(data.toString('binary', p, i)) }
p = i
if ((this._bytesKey = this._key.length) === this.fieldNameSizeLimit) {
// yep, we actually did hit the limit
this._checkingBytes = false
this._keyTrunc = true
}
} else {
if (p < len) { this._key += this.decoder.write(data.toString('binary', p)) }
p = len
}
} else {
idxamp = undefined
for (i = p; i < len; ++i) {
if (!this._checkingBytes) { ++p }
if (data[i] === 0x26/* & */) {
idxamp = i
break
}
if (this._checkingBytes && this._bytesVal === this.fieldSizeLimit) {
this._hitLimit = true
break
} else if (this._checkingBytes) { ++this._bytesVal }
}
if (idxamp !== undefined) {
++this._fields
if (idxamp > p) { this._val += this.decoder.write(data.toString('binary', p, idxamp)) }
this.boy.emit('field', decodeText(this._key, 'binary', this.charset),
decodeText(this._val, 'binary', this.charset),
this._keyTrunc,
this._valTrunc)
this._state = 'key'
this._hitLimit = false
this._checkingBytes = true
this._key = ''
this._bytesKey = 0
this._keyTrunc = false
this.decoder.reset()
p = idxamp + 1
if (this._fields === this.fieldsLimit) { return cb() }
} else if (this._hitLimit) {
// we may not have hit the actual limit if there are encoded bytes...
if (i > p) { this._val += this.decoder.write(data.toString('binary', p, i)) }
p = i
if ((this._val === '' && this.fieldSizeLimit === 0) ||
(this._bytesVal = this._val.length) === this.fieldSizeLimit) {
// yep, we actually did hit the limit
this._checkingBytes = false
this._valTrunc = true
}
} else {
if (p < len) { this._val += this.decoder.write(data.toString('binary', p)) }
p = len
}
}
}
cb()
}
UrlEncoded.prototype.end = function () {
if (this.boy._done) { return }
if (this._state === 'key' && this._key.length > 0) {
this.boy.emit('field', decodeText(this._key, 'binary', this.charset),
'',
this._keyTrunc,
false)
} else if (this._state === 'val') {
this.boy.emit('field', decodeText(this._key, 'binary', this.charset),
decodeText(this._val, 'binary', this.charset),
this._keyTrunc,
this._valTrunc)
}
this.boy._done = true
this.boy.emit('finish')
}
module.exports = UrlEncoded
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