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Ben Alpert
313
Libraries/Fetch/fetch.js
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313
Libraries/Fetch/fetch.js
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/**
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* Copyright 2004-present Facebook. All Rights Reserved.
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*
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* This is a third-party polyfill grabbed from:
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* https://github.com/github/fetch
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*
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* @providesModule fetch
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* @nolint
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*/
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'use strict';
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var self = {};
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/**
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* Copyright (c) 2014 GitHub, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* @preserve-header
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*/
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(function() {
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'use strict';
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if (self.fetch) {
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return
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}
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function Headers(headers) {
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this.map = {}
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var self = this
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if (headers instanceof Headers) {
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headers.forEach(function(name, values) {
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values.forEach(function(value) {
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self.append(name, value)
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})
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})
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} else if (headers) {
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Object.getOwnPropertyNames(headers).forEach(function(name) {
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self.append(name, headers[name])
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})
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}
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}
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Headers.prototype.append = function(name, value) {
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name = name.toLowerCase()
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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[name.toLowerCase()]
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}
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Headers.prototype.get = function(name) {
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var values = this.map[name.toLowerCase()]
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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[name.toLowerCase()] || []
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}
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Headers.prototype.has = function(name) {
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return this.map.hasOwnProperty(name.toLowerCase())
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}
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Headers.prototype.set = function(name, value) {
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this.map[name.toLowerCase()] = [value]
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}
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// Instead of iterable for now.
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Headers.prototype.forEach = function(callback) {
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var self = this
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Object.getOwnPropertyNames(this.map).forEach(function(name) {
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callback(name, self.map[name])
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})
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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 blobSupport = '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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function Body() {
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this.bodyUsed = false
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if (blobSupport) {
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this.blob = function() {
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var rejected = consumed(this)
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return rejected ? rejected : Promise.resolve(this._bodyBlob)
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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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return this.blob().then(readBlobAsText)
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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 ('FormData' in self) {
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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._body = options.body
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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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}
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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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Request.prototype.fetch = function() {
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var self = this
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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(body, 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(self.method, self.url)
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if ('responseType' in xhr && blobSupport) {
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xhr.responseType = 'blob'
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}
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self.headers.forEach(function(name, values) {
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values.forEach(function(value) {
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xhr.setRequestHeader(name, value)
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})
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})
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xhr.send((self._body === undefined) ? null : self._body)
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})
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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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if (blobSupport) {
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if (typeof bodyInit === 'string') {
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this._bodyBlob = new Blob([bodyInit])
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} else {
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this._bodyBlob = bodyInit
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}
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} else {
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this._bodyText = bodyInit
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}
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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.statusText = options.statusText
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this.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 (url, options) {
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return new Request(url, options).fetch()
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}
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self.fetch.polyfill = true
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})();
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/** End of the third-party code */
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module.exports = self.fetch;
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