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| /* najax
* jquery ajax-stye http requests in node
* https://github.com/alanclarke/najax
*/
var https = require('https')
var http = require('http')
var querystring = require('qs')
var url = require('url')
var zlib = require('zlib')
var $ = require('jquery-deferred')
var defaultsDeep = require('lodash/defaultsDeep')
var parseOptions = require('./parse-options')
var defaults = {
method: 'GET',
rejectUnauthorized: true,
processData: true,
data: '',
contentType: 'application/x-www-form-urlencoded',
headers: {},
setRequestHeader: function (name, value) {
this.headers[name] = value
}
}
/*
method overloading, can use:
-function(url, opts, callback) or
-function(url, callback)
-function(opts)
*/
function najax (uri, options, callback) {
var dfd = new $.Deferred()
var o = defaultsDeep({}, parseOptions(uri, options, callback), defaults)
var l = url.parse(o.url)
var ssl = l.protocol.indexOf('https') === 0
// DATA
// Per jquery docs / source: encoding is only done
// if processData is true (defaults to true)
// and the data is not already a string
// https://github.com/jquery/jquery/blob/master/src/ajax.js#L518
if (o.data && o.processData && o.method === 'GET') {
o.data = querystring.stringify(o.data, { arrayFormat: 'brackets' })
} else if (
o.data &&
o.processData &&
typeof o.data !== 'string' &&
o.method !== 'GET'
) {
switch (true) {
case o.contentType.startsWith('application/json'):
o.data = JSON.stringify(o.data)
break
case o.contentType.startsWith('application/x-www-form-urlencoded'):
o.data = querystring.stringify(o.data)
break
default:
o.data = String(o.data)
}
}
/* if get, use querystring method for data */
if (o.data) {
if (o.method === 'GET') {
Iif (l.search) {
l.search += '&' + o.data
} else {
l.search = '?' + o.data
}
} else {
/* set data content type */
o.headers = Object.assign(
{
'Content-Type': o.contentType,
'Content-Length': Buffer.byteLength(o.data)
},
o.headers
)
}
}
if (o.beforeSend) o.beforeSend(o)
options = {
host: l.hostname,
path: l.pathname + (l.search || ''),
method: o.method,
port: Number(l.port) || (ssl ? 443 : 80),
headers: o.headers,
rejectUnauthorized: o.rejectUnauthorized
}
// AUTHENTICATION
/* add authentication to http request */
if (l.auth) {
options.auth = l.auth
} else if (o.username && o.password) {
options.auth = o.username + ':' + o.password
} else if (o.auth) {
options.auth = o.auth
}
/* pass keep-alive agent if provided */
Iif (o.agent) options.agent = o.agent
/* for debugging, method to get options and return */
if (o.getopts) {
var getopts = [
ssl,
options,
o.data || false,
o.success || false,
o.error || false
]
return getopts
}
// REQUEST
function notImplemented (name) {
return function () {
console.error('najax: method jqXHR."' + name + '" not implemented')
console.trace()
}
}
var jqXHR = {
readyState: 0,
status: 0,
statusText: 'error', // one of: "success", "notmodified", "error", "timeout", "abort", or "parsererror"
setRequestHeader: notImplemented('setRequestHeader'),
getAllResponseHeaders: notImplemented('getAllResponseHeaders'),
statusCode: notImplemented('statusCode'),
abort: notImplemented('abort')
}
var req = (ssl ? https : http).request(options, function (res) {
// Allow getting Response Headers from the XMLHTTPRequest object
dfd.getResponseHeader = jqXHR.getResponseHeader = function getResponseHeader (
header
) {
return res.headers[header.toLowerCase()]
}
dfd.getAllResponseHeaders = jqXHR.getAllResponseHeaders = function getAllResponseHeaders () {
var headers = []
for (var key in res.headers) {
headers.push(key + ': ' + res.headers[key])
}
return headers.join('\n')
}
function dataHandler (data) {
jqXHR.responseText = data
var statusCode = res.statusCode
//
// Determine if successful
// (per https://github.com/jquery/jquery/blob/master/src/ajax.js#L679)
var isSuccess =
(statusCode >= 200 && statusCode < 300) || statusCode === 304
// Set readyState
jqXHR.readyState = statusCode > 0 ? 4 : 0
jqXHR.status = statusCode
if (o.dataType === 'json' || o.dataType === 'jsonp') {
// replace control characters
try {
data = JSON.parse(data.replace(/[\cA-\cZ]/gi, ''))
} catch (e) {
jqXHR.statusText = 'parseerror'
return onError(e)
}
}
if (isSuccess) {
jqXHR.statusText = 'success'
Iif (statusCode === 204 || options.method === 'HEAD') {
jqXHR.statusText = 'nocontent'
} else Iif (statusCode === 304) {
jqXHR.statusText = 'notmodified'
}
// success, statusText, jqXHR
dfd.resolve(data, jqXHR.statusText, jqXHR)
} else {
// jqXHR, statusText, error
// When an HTTP error occurs, errorThrown receives the textual portion of the
// HTTP status, such as "Not Found" or "Internal Server Error."
jqXHR.statusText = 'error'
onError(new Error(http.STATUS_CODES[statusCode]))
}
}
var chunks = []
res.on('data', function (chunk) {
chunks.push(chunk)
})
res.on('end', function () {
var buffer = Buffer.concat(chunks)
var encoding = res.headers['content-encoding']
if (encoding === 'gzip') {
zlib.gunzip(buffer, function (err, buffer) {
Iif (err) {
onError(err)
} else {
dataHandler(buffer.toString())
}
})
} else if (encoding === 'deflate') {
zlib.inflate(buffer, function (err, buffer) {
Iif (err) {
onError(err)
} else {
dataHandler(buffer.toString())
}
})
} else {
dataHandler(buffer.toString())
}
})
})
// ERROR
req.on('error', onError)
function onError (e) {
// jqXHR, statusText, error
dfd.reject(jqXHR, jqXHR.statusText, e)
}
// SET TIMEOUT
if (o.timeout && o.timeout > 0) {
req.setTimeout(o.timeout, function () {
req.abort()
jqXHR.statusText = 'timeout'
onError(new Error('timeout'))
})
}
// SEND DATA
if (o.method !== 'GET' && o.data) req.write(o.data, 'utf-8')
req.end()
// DEFERRED
dfd.done(o.success)
dfd.done(o.complete)
dfd.fail(o.error)
dfd.fail(o.complete)
dfd.success = dfd.done
dfd.error = dfd.fail
return dfd
}
najax.defaults = function mergeDefaults (opts) {
return defaultsDeep(defaults, opts)
}
/* auto rest interface go! */
;['GET', 'POST', 'PUT', 'DELETE'].forEach(handleMethod)
function handleMethod (method) {
najax[method.toLowerCase()] = function methodHandler (
uri,
options,
callback
) {
return najax(
defaultsDeep(parseOptions(uri, options, callback), { method: method })
)
}
}
module.exports = najax
|