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https://github.com/NativeScript/NativeScript.git
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fetch.js added
This commit is contained in:
Vladimir Enchev
333
fetch/fetch.js
Normal file
333
fetch/fetch.js
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@ -0,0 +1,333 @@
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(function () {
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'use strict';
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var self = exports;
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if (self.fetch) {
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return
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}
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function normalizeName(name) {
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if (typeof name !== 'string') {
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name = name.toString();
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}
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if (/[^a-z0-9\-#$%&'*+.\^_`|~]/i.test(name)) {
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throw new TypeError('Invalid character in header field name')
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}
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return name.toLowerCase()
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}
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function normalizeValue(value) {
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if (typeof value !== 'string') {
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value = value.toString();
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}
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return value
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}
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function Headers(headers) {
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this.map = {}
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if (headers instanceof Headers) {
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headers.forEach(function (value, name) {
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this.append(name, value)
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}, this)
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} else if (headers) {
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Object.getOwnPropertyNames(headers).forEach(function (name) {
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this.append(name, headers[name])
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}, this)
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}
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}
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Headers.prototype.append = function (name, value) {
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name = normalizeName(name)
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value = normalizeValue(value)
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var list = this.map[name]
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if (!list) {
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list = []
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this.map[name] = list
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}
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list.push(value)
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}
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Headers.prototype['delete'] = function (name) {
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delete this.map[normalizeName(name)]
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}
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Headers.prototype.get = function (name) {
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var values = this.map[normalizeName(name)]
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return values ? values[0] : null
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}
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Headers.prototype.getAll = function (name) {
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return this.map[normalizeName(name)] || []
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}
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Headers.prototype.has = function (name) {
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return this.map.hasOwnProperty(normalizeName(name))
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}
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Headers.prototype.set = function (name, value) {
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this.map[normalizeName(name)] = [normalizeValue(value)]
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}
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Headers.prototype.forEach = function (callback, thisArg) {
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Object.getOwnPropertyNames(this.map).forEach(function (name) {
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this.map[name].forEach(function (value) {
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callback.call(thisArg, value, name, this)
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}, this)
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}, this)
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}
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function consumed(body) {
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if (body.bodyUsed) {
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return Promise.reject(new TypeError('Already read'))
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}
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body.bodyUsed = true
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}
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function fileReaderReady(reader) {
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return new Promise(function (resolve, reject) {
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reader.onload = function () {
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resolve(reader.result)
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}
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reader.onerror = function () {
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reject(reader.error)
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}
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})
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}
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function readBlobAsArrayBuffer(blob) {
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var reader = new FileReader()
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reader.readAsArrayBuffer(blob)
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return fileReaderReady(reader)
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}
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function readBlobAsText(blob) {
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var reader = new FileReader()
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reader.readAsText(blob)
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return fileReaderReady(reader)
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}
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var support = {
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blob: 'FileReader' in self && 'Blob' in self && (function () {
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try {
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new Blob();
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return true
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} catch (e) {
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return false
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}
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})(),
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formData: 'FormData' in self
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}
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function Body() {
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this.bodyUsed = false
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this._initBody = function (body) {
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this._bodyInit = body
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if (typeof body === 'string') {
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this._bodyText = body
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} else if (support.blob && Blob.prototype.isPrototypeOf(body)) {
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this._bodyBlob = body
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} else if (support.formData && FormData.prototype.isPrototypeOf(body)) {
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this._bodyFormData = body
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} else if (!body) {
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this._bodyText = ''
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} else {
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throw new Error('unsupported BodyInit type')
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}
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}
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if (support.blob) {
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this.blob = function () {
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var rejected = consumed(this)
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if (rejected) {
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return rejected
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}
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if (this._bodyBlob) {
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return Promise.resolve(this._bodyBlob)
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} else if (this._bodyFormData) {
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throw new Error('could not read FormData body as blob')
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} else {
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return Promise.resolve(new Blob([this._bodyText]))
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}
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}
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this.arrayBuffer = function () {
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return this.blob().then(readBlobAsArrayBuffer)
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}
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this.text = function () {
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var rejected = consumed(this)
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if (rejected) {
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return rejected
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}
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if (this._bodyBlob) {
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return readBlobAsText(this._bodyBlob)
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} else if (this._bodyFormData) {
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throw new Error('could not read FormData body as text')
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} else {
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return Promise.resolve(this._bodyText)
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}
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}
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} else {
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this.text = function () {
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var rejected = consumed(this)
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return rejected ? rejected : Promise.resolve(this._bodyText)
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}
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}
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if (support.formData) {
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this.formData = function () {
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return this.text().then(decode)
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}
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}
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this.json = function () {
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return this.text().then(JSON.parse)
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}
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return this
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}
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// HTTP methods whose capitalization should be normalized
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var methods = ['DELETE', 'GET', 'HEAD', 'OPTIONS', 'POST', 'PUT']
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function normalizeMethod(method) {
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var upcased = method.toUpperCase()
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return (methods.indexOf(upcased) > -1) ? upcased : method
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}
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function Request(url, options) {
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options = options || {}
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this.url = url
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this.credentials = options.credentials || 'omit'
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this.headers = new Headers(options.headers)
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this.method = normalizeMethod(options.method || 'GET')
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this.mode = options.mode || null
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this.referrer = null
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if ((this.method === 'GET' || this.method === 'HEAD') && options.body) {
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throw new TypeError('Body not allowed for GET or HEAD requests')
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}
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this._initBody(options.body)
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}
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function decode(body) {
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var form = new FormData()
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body.trim().split('&').forEach(function (bytes) {
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if (bytes) {
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var split = bytes.split('=')
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var name = split.shift().replace(/\+/g, ' ')
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var value = split.join('=').replace(/\+/g, ' ')
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form.append(decodeURIComponent(name), decodeURIComponent(value))
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}
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})
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return form
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}
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function headers(xhr) {
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var head = new Headers()
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var pairs = xhr.getAllResponseHeaders().trim().split('\n')
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pairs.forEach(function (header) {
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var split = header.trim().split(':')
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var key = split.shift().trim()
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var value = split.join(':').trim()
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head.append(key, value)
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})
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return head
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}
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Body.call(Request.prototype)
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function Response(bodyInit, options) {
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if (!options) {
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options = {}
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}
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this._initBody(bodyInit)
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this.type = 'default'
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this.url = null
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this.status = options.status
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this.ok = this.status >= 200 && this.status < 300
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this.statusText = options.statusText
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this.headers = options.headers instanceof Headers ? options.headers : new Headers(options.headers)
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this.url = options.url || ''
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}
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Body.call(Response.prototype)
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self.Headers = Headers;
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self.Request = Request;
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self.Response = Response;
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self.fetch = function (input, init) {
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// TODO: Request constructor should accept input, init
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var request
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if (Request.prototype.isPrototypeOf(input) && !init) {
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request = input
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} else {
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request = new Request(input, init)
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}
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return new Promise(function (resolve, reject) {
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var xhr = new XMLHttpRequest()
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function responseURL() {
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if ('responseURL' in xhr) {
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return xhr.responseURL
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}
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// Avoid security warnings on getResponseHeader when not allowed by CORS
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if (/^X-Request-URL:/m.test(xhr.getAllResponseHeaders())) {
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return xhr.getResponseHeader('X-Request-URL')
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}
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return;
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}
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xhr.onload = function () {
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var status = (xhr.status === 1223) ? 204 : xhr.status
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if (status < 100 || status > 599) {
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reject(new TypeError('Network request failed'))
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return
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}
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var options = {
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status: status,
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statusText: xhr.statusText,
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headers: headers(xhr),
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url: responseURL()
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}
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//var body = 'response' in xhr ? xhr.response : xhr.responseText;
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resolve(new Response(xhr.responseText, options))
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}
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xhr.onerror = function () {
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reject(new TypeError('Network request failed'))
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}
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xhr.open(request.method, request.url, true)
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if (request.credentials === 'include') {
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xhr.withCredentials = true
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}
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if ('responseType' in xhr && support.blob) {
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xhr.responseType = 'blob'
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}
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request.headers.forEach(function (value, name) {
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xhr.setRequestHeader(name, value)
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})
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xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit)
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})
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}
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self.fetch.polyfill = true
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})();
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