diff options
author | Andrew Dolgov <[email protected]> | 2017-11-19 15:03:05 +0300 |
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committer | Andrew Dolgov <[email protected]> | 2017-11-19 15:03:05 +0300 |
commit | 563c729643221c172fbb44702af7f09eaa289cff (patch) | |
tree | 2fe568048e81dcd1a6099ee5752086109fa3f1e1 /lib/fetch.js | |
parent | 426de349050c8f7dff0494fae9c337f9287f2e13 (diff) |
add some polyfills for garbage browsers
Diffstat (limited to 'lib/fetch.js')
-rw-r--r-- | lib/fetch.js | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/lib/fetch.js b/lib/fetch.js new file mode 100644 index 0000000..3791e48 --- /dev/null +++ b/lib/fetch.js @@ -0,0 +1,418 @@ +(function(self) { + 'use strict'; + + // if __disableNativeFetch is set to true, the it will always polyfill fetch + // with Ajax. + if (!self.__disableNativeFetch && self.fetch) { + return + } + + function normalizeName(name) { + if (typeof name !== 'string') { + name = String(name) + } + if (/[^a-z0-9\-#$%&'*+.\^_`|~]/i.test(name)) { + throw new TypeError('Invalid character in header field name') + } + return name.toLowerCase() + } + + function normalizeValue(value) { + if (typeof value !== 'string') { + value = String(value) + } + return value + } + + function Headers(headers) { + this.map = {} + + if (headers instanceof Headers) { + headers.forEach(function(value, name) { + this.append(name, value) + }, this) + + } else if (headers) { + Object.getOwnPropertyNames(headers).forEach(function(name) { + this.append(name, headers[name]) + }, this) + } + } + + Headers.prototype.append = function(name, value) { + name = normalizeName(name) + value = normalizeValue(value) + var list = this.map[name] + if (!list) { + list = [] + this.map[name] = list + } + list.push(value) + } + + Headers.prototype['delete'] = function(name) { + delete this.map[normalizeName(name)] + } + + Headers.prototype.get = function(name) { + var values = this.map[normalizeName(name)] + return values ? values[0] : null + } + + Headers.prototype.getAll = function(name) { + return this.map[normalizeName(name)] || [] + } + + Headers.prototype.has = function(name) { + return this.map.hasOwnProperty(normalizeName(name)) + } + + Headers.prototype.set = function(name, value) { + this.map[normalizeName(name)] = [normalizeValue(value)] + } + + Headers.prototype.forEach = function(callback, thisArg) { + Object.getOwnPropertyNames(this.map).forEach(function(name) { + this.map[name].forEach(function(value) { + callback.call(thisArg, value, name, this) + }, this) + }, this) + } + + function consumed(body) { + if (body.bodyUsed) { + return Promise.reject(new TypeError('Already read')) + } + body.bodyUsed = true + } + + function fileReaderReady(reader) { + return new Promise(function(resolve, reject) { + reader.onload = function() { + resolve(reader.result) + } + reader.onerror = function() { + reject(reader.error) + } + }) + } + + function readBlobAsArrayBuffer(blob) { + var reader = new FileReader() + reader.readAsArrayBuffer(blob) + return fileReaderReady(reader) + } + + function readBlobAsText(blob, options) { + var reader = new FileReader() + var contentType = options.headers.map['content-type'] ? options.headers.map['content-type'].toString() : '' + var regex = /charset\=[0-9a-zA-Z\-\_]*;?/ + var _charset = blob.type.match(regex) || contentType.match(regex) + var args = [blob] + + if(_charset) { + args.push(_charset[0].replace(/^charset\=/, '').replace(/;$/, '')) + } + + reader.readAsText.apply(reader, args) + return fileReaderReady(reader) + } + + var support = { + blob: 'FileReader' in self && 'Blob' in self && (function() { + try { + new Blob(); + return true + } catch(e) { + return false + } + })(), + formData: 'FormData' in self, + arrayBuffer: 'ArrayBuffer' in self + } + + function Body() { + this.bodyUsed = false + + + this._initBody = function(body, options) { + this._bodyInit = body + if (typeof body === 'string') { + this._bodyText = body + } else if (support.blob && Blob.prototype.isPrototypeOf(body)) { + this._bodyBlob = body + this._options = options + } else if (support.formData && FormData.prototype.isPrototypeOf(body)) { + this._bodyFormData = body + } else if (!body) { + this._bodyText = '' + } else if (support.arrayBuffer && ArrayBuffer.prototype.isPrototypeOf(body)) { + // Only support ArrayBuffers for POST method. + // Receiving ArrayBuffers happens via Blobs, instead. + } else { + throw new Error('unsupported BodyInit type') + } + } + + if (support.blob) { + this.blob = function() { + var rejected = consumed(this) + if (rejected) { + return rejected + } + + if (this._bodyBlob) { + return Promise.resolve(this._bodyBlob) + } else if (this._bodyFormData) { + throw new Error('could not read FormData body as blob') + } else { + return Promise.resolve(new Blob([this._bodyText])) + } + } + + this.arrayBuffer = function() { + return this.blob().then(readBlobAsArrayBuffer) + } + + this.text = function() { + var rejected = consumed(this) + if (rejected) { + return rejected + } + + if (this._bodyBlob) { + return readBlobAsText(this._bodyBlob, this._options) + } else if (this._bodyFormData) { + throw new Error('could not read FormData body as text') + } else { + return Promise.resolve(this._bodyText) + } + } + } else { + this.text = function() { + var rejected = consumed(this) + return rejected ? rejected : Promise.resolve(this._bodyText) + } + } + + if (support.formData) { + this.formData = function() { + return this.text().then(decode) + } + } + + this.json = function() { + return this.text().then(JSON.parse) + } + + return this + } + + // HTTP methods whose capitalization should be normalized + var methods = ['DELETE', 'GET', 'HEAD', 'OPTIONS', 'POST', 'PUT'] + + function normalizeMethod(method) { + var upcased = method.toUpperCase() + return (methods.indexOf(upcased) > -1) ? upcased : method + } + + function Request(input, options) { + options = options || {} + var body = options.body + if (Request.prototype.isPrototypeOf(input)) { + if (input.bodyUsed) { + throw new TypeError('Already read') + } + this.url = input.url + this.credentials = input.credentials + if (!options.headers) { + this.headers = new Headers(input.headers) + } + this.method = input.method + this.mode = input.mode + if (!body) { + body = input._bodyInit + input.bodyUsed = true + } + } else { + this.url = input + } + + this.credentials = options.credentials || this.credentials || 'omit' + if (options.headers || !this.headers) { + this.headers = new Headers(options.headers) + } + this.method = normalizeMethod(options.method || this.method || 'GET') + this.mode = options.mode || this.mode || null + this.referrer = null + + if ((this.method === 'GET' || this.method === 'HEAD') && body) { + throw new TypeError('Body not allowed for GET or HEAD requests') + } + this._initBody(body, options) + } + + Request.prototype.clone = function() { + return new Request(this) + } + + function decode(body) { + var form = new FormData() + body.trim().split('&').forEach(function(bytes) { + if (bytes) { + var split = bytes.split('=') + var name = split.shift().replace(/\+/g, ' ') + var value = split.join('=').replace(/\+/g, ' ') + form.append(decodeURIComponent(name), decodeURIComponent(value)) + } + }) + return form + } + + function headers(xhr) { + var head = new Headers() + var pairs = xhr.getAllResponseHeaders().trim().split('\n') + pairs.forEach(function(header) { + var split = header.trim().split(':') + var key = split.shift().trim() + var value = split.join(':').trim() + head.append(key, value) + }) + return head + } + + Body.call(Request.prototype) + + function Response(bodyInit, options) { + if (!options) { + options = {} + } + + this._initBody(bodyInit, options) + this.type = 'default' + this.status = options.status + this.ok = this.status >= 200 && this.status < 300 + this.statusText = options.statusText + this.headers = options.headers instanceof Headers ? options.headers : new Headers(options.headers) + this.url = options.url || '' + } + + Body.call(Response.prototype) + + Response.prototype.clone = function() { + return new Response(this._bodyInit, { + status: this.status, + statusText: this.statusText, + headers: new Headers(this.headers), + url: this.url + }) + } + + Response.error = function() { + var response = new Response(null, {status: 0, statusText: ''}) + response.type = 'error' + return response + } + + var redirectStatuses = [301, 302, 303, 307, 308] + + Response.redirect = function(url, status) { + if (redirectStatuses.indexOf(status) === -1) { + throw new RangeError('Invalid status code') + } + + return new Response(null, {status: status, headers: {location: url}}) + } + + self.Headers = Headers; + self.Request = Request; + self.Response = Response; + + self.fetch = function(input, init) { + return new Promise(function(resolve, reject) { + var request + if (Request.prototype.isPrototypeOf(input) && !init) { + request = input + } else { + request = new Request(input, init) + } + + var xhr = new XMLHttpRequest() + + function responseURL() { + if ('responseURL' in xhr) { + return xhr.responseURL + } + + // Avoid security warnings on getResponseHeader when not allowed by CORS + if (/^X-Request-URL:/m.test(xhr.getAllResponseHeaders())) { + return xhr.getResponseHeader('X-Request-URL') + } + + return; + } + + var __onLoadHandled = false; + + function onload() { + if (xhr.readyState !== 4) { + return + } + var status = (xhr.status === 1223) ? 204 : xhr.status + if (status < 100 || status > 599) { + if (__onLoadHandled) { return; } else { __onLoadHandled = true; } + reject(new TypeError('Network request failed')) + return + } + var options = { + status: status, + statusText: xhr.statusText, + headers: headers(xhr), + url: responseURL() + } + var body = 'response' in xhr ? xhr.response : xhr.responseText; + + if (__onLoadHandled) { return; } else { __onLoadHandled = true; } + resolve(new Response(body, options)) + } + xhr.onreadystatechange = onload; + xhr.onload = onload; + xhr.onerror = function() { + if (__onLoadHandled) { return; } else { __onLoadHandled = true; } + reject(new TypeError('Network request failed')) + } + + xhr.open(request.method, request.url, true) + + // `withCredentials` should be setted after calling `.open` in IE10 + // http://stackoverflow.com/a/19667959/1219343 + try { + if (request.credentials === 'include') { + if ('withCredentials' in xhr) { + xhr.withCredentials = true; + } else { + console && console.warn && console.warn('withCredentials is not supported, you can ignore this warning'); + } + } + } catch (e) { + console && console.warn && console.warn('set withCredentials error:' + e); + } + + if ('responseType' in xhr && support.blob) { + xhr.responseType = 'blob' + } + + request.headers.forEach(function(value, name) { + xhr.setRequestHeader(name, value) + }) + + xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit) + }) + } + self.fetch.polyfill = true + + // Support CommonJS + if (typeof module !== 'undefined' && module.exports) { + module.exports = self.fetch; + } +})(typeof self !== 'undefined' ? self : this); |