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import {overrideMimeType} from './capability';
import {inherits} from 'util';
import {Readable} from 'stream';
var rStates = {
UNSENT: 0,
OPENED: 1,
HEADERS_RECEIVED: 2,
LOADING: 3,
DONE: 4
}
export {
rStates as readyStates
};
export function IncomingMessage(xhr, response, mode) {
var self = this
Readable.call(self)
self._mode = mode
self.headers = {}
self.rawHeaders = []
self.trailers = {}
self.rawTrailers = []
// Fake the 'close' event, but only once 'end' fires
self.on('end', function() {
// The nextTick is necessary to prevent the 'request' module from causing an infinite loop
process.nextTick(function() {
self.emit('close')
})
})
var read;
if (mode === 'fetch') {
self._fetchResponse = response
self.url = response.url
self.statusCode = response.status
self.statusMessage = response.statusText
// backwards compatible version of for (<item> of <iterable>):
// for (var <item>,_i,_it = <iterable>[Symbol.iterator](); <item> = (_i = _it.next()).value,!_i.done;)
for (var header, _i, _it = response.headers[Symbol.iterator](); header = (_i = _it.next()).value, !_i.done;) {
self.headers[header[0].toLowerCase()] = header[1]
self.rawHeaders.push(header[0], header[1])
}
// TODO: this doesn't respect backpressure. Once WritableStream is available, this can be fixed
var reader = response.body.getReader()
read = function () {
reader.read().then(function(result) {
if (self._destroyed)
return
if (result.done) {
self.push(null)
return
}
self.push(new Buffer(result.value))
read()
})
}
read()
} else {
self._xhr = xhr
self._pos = 0
self.url = xhr.responseURL
self.statusCode = xhr.status
self.statusMessage = xhr.statusText
var headers = xhr.getAllResponseHeaders().split(/\r?\n/)
headers.forEach(function(header) {
var matches = header.match(/^([^:]+):\s*(.*)/)
if (matches) {
var key = matches[1].toLowerCase()
if (key === 'set-cookie') {
if (self.headers[key] === undefined) {
self.headers[key] = []
}
self.headers[key].push(matches[2])
} else if (self.headers[key] !== undefined) {
self.headers[key] += ', ' + matches[2]
} else {
self.headers[key] = matches[2]
}
self.rawHeaders.push(matches[1], matches[2])
}
})
self._charset = 'x-user-defined'
if (!overrideMimeType) {
var mimeType = self.rawHeaders['mime-type']
if (mimeType) {
var charsetMatch = mimeType.match(/;\s*charset=([^;])(;|$)/)
if (charsetMatch) {
self._charset = charsetMatch[1].toLowerCase()
}
}
if (!self._charset)
self._charset = 'utf-8' // best guess
}
}
}
inherits(IncomingMessage, Readable)
IncomingMessage.prototype._read = function() {}
IncomingMessage.prototype._onXHRProgress = function() {
var self = this
var xhr = self._xhr
var response = null
switch (self._mode) {
case 'text:vbarray': // For IE9
if (xhr.readyState !== rStates.DONE)
break
try {
// This fails in IE8
response = new global.VBArray(xhr.responseBody).toArray()
} catch (e) {
// pass
}
if (response !== null) {
self.push(new Buffer(response))
break
}
// Falls through in IE8
case 'text':
try { // This will fail when readyState = 3 in IE9. Switch mode and wait for readyState = 4
response = xhr.responseText
} catch (e) {
self._mode = 'text:vbarray'
break
}
if (response.length > self._pos) {
var newData = response.substr(self._pos)
if (self._charset === 'x-user-defined') {
var buffer = new Buffer(newData.length)
for (var i = 0; i < newData.length; i++)
buffer[i] = newData.charCodeAt(i) & 0xff
self.push(buffer)
} else {
self.push(newData, self._charset)
}
self._pos = response.length
}
break
case 'arraybuffer':
if (xhr.readyState !== rStates.DONE || !xhr.response)
break
response = xhr.response
self.push(new Buffer(new Uint8Array(response)))
break
case 'moz-chunked-arraybuffer': // take whole
response = xhr.response
if (xhr.readyState !== rStates.LOADING || !response)
break
self.push(new Buffer(new Uint8Array(response)))
break
case 'ms-stream':
response = xhr.response
if (xhr.readyState !== rStates.LOADING)
break
var reader = new global.MSStreamReader()
reader.onprogress = function() {
if (reader.result.byteLength > self._pos) {
self.push(new Buffer(new Uint8Array(reader.result.slice(self._pos))))
self._pos = reader.result.byteLength
}
}
reader.onload = function() {
self.push(null)
}
// reader.onerror = ??? // TODO: this
reader.readAsArrayBuffer(response)
break
}
// The ms-stream case handles end separately in reader.onload()
if (self._xhr.readyState === rStates.DONE && self._mode !== 'ms-stream') {
self.push(null)
}
}
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