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450 lines (396 loc) · 11.9 KB
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule XMLHttpRequest
* @flow
*/
'use strict';
const RCTNetworking = require('RCTNetworking');
const EventTarget = require('event-target-shim');
const invariant = require('fbjs/lib/invariant');
const utf8 = require('utf8');
const warning = require('fbjs/lib/warning');
type ResponseType = '' | 'arraybuffer' | 'blob' | 'document' | 'json' | 'text';
type Response = ?Object | string;
const UNSENT = 0;
const OPENED = 1;
const HEADERS_RECEIVED = 2;
const LOADING = 3;
const DONE = 4;
const SUPPORTED_RESPONSE_TYPES = {
arraybuffer: typeof global.ArrayBuffer === 'function',
blob: typeof global.Blob === 'function',
document: false,
json: true,
text: true,
'': true,
};
const REQUEST_EVENTS = [
'abort',
'error',
'load',
'loadstart',
'progress',
'timeout',
'loadend',
];
const XHR_EVENTS = REQUEST_EVENTS.concat('readystatechange');
class XMLHttpRequestEventTarget extends EventTarget(...REQUEST_EVENTS) {
onload: ?Function;
onloadstart: ?Function;
onprogress: ?Function;
ontimeout: ?Function;
onerror: ?Function;
onloadend: ?Function;
}
/**
* Shared base for platform-specific XMLHttpRequest implementations.
*/
class XMLHttpRequest extends EventTarget(...XHR_EVENTS) {
static UNSENT: number = UNSENT;
static OPENED: number = OPENED;
static HEADERS_RECEIVED: number = HEADERS_RECEIVED;
static LOADING: number = LOADING;
static DONE: number = DONE;
UNSENT: number = UNSENT;
OPENED: number = OPENED;
HEADERS_RECEIVED: number = HEADERS_RECEIVED;
LOADING: number = LOADING;
DONE: number = DONE;
// EventTarget automatically initializes these to `null`.
onload: ?Function;
onloadstart: ?Function;
onprogress: ?Function;
ontimeout: ?Function;
onerror: ?Function;
onloadend: ?Function;
onreadystatechange: ?Function;
readyState: number = UNSENT;
responseHeaders: ?Object;
responseText: string = '';
status: number = 0;
timeout: number = 0;
responseURL: ?string;
upload: XMLHttpRequestEventTarget = new XMLHttpRequestEventTarget();
_requestId: ?number;
_subscriptions: [any];
_aborted: boolean = false;
_cachedResponse: Response;
_hasError: boolean = false;
_headers: Object;
_lowerCaseResponseHeaders: Object;
_method: ?string = null;
_response: string | ?Object;
_responseType: ResponseType;
_sent: boolean;
_url: ?string = null;
_timedOut: boolean = false;
_incrementalEvents: boolean = false;
constructor() {
super();
this._reset();
}
_reset(): void {
this.readyState = this.UNSENT;
this.responseHeaders = undefined;
this.responseText = '';
this.status = 0;
delete this.responseURL;
this._requestId = null;
this._cachedResponse = undefined;
this._hasError = false;
this._headers = {};
this._responseType = '';
this._sent = false;
this._lowerCaseResponseHeaders = {};
this._clearSubscriptions();
this._timedOut = false;
}
// $FlowIssue #10784535
get responseType(): ResponseType {
return this._responseType;
}
// $FlowIssue #10784535
set responseType(responseType: ResponseType): void {
if (this.readyState > HEADERS_RECEIVED) {
throw new Error(
"Failed to set the 'responseType' property on 'XMLHttpRequest': The " +
"response type cannot be set if the object's state is LOADING or DONE"
);
}
if (!SUPPORTED_RESPONSE_TYPES.hasOwnProperty(responseType)) {
warning(
`The provided value '${responseType}' is not a valid 'responseType'.`);
return;
}
// redboxes early, e.g. for 'arraybuffer' on ios 7
invariant(
SUPPORTED_RESPONSE_TYPES[responseType] || responseType === 'document',
`The provided value '${responseType}' is unsupported in this environment.`
);
this._responseType = responseType;
}
// $FlowIssue #10784535
get response(): Response {
const {responseType} = this;
if (responseType === '' || responseType === 'text') {
return this.readyState < LOADING || this._hasError
? ''
: this.responseText;
}
if (this.readyState !== DONE) {
return null;
}
if (this._cachedResponse !== undefined) {
return this._cachedResponse;
}
switch (this.responseType) {
case 'document':
this._cachedResponse = null;
break;
case 'arraybuffer':
this._cachedResponse = toArrayBuffer(
this.responseText, this.getResponseHeader('content-type') || '');
break;
case 'blob':
this._cachedResponse = new global.Blob(
[this.responseText],
{type: this.getResponseHeader('content-type') || ''}
);
break;
case 'json':
try {
this._cachedResponse = JSON.parse(this.responseText);
} catch (_) {
this._cachedResponse = null;
}
break;
default:
this._cachedResponse = null;
}
return this._cachedResponse;
}
// exposed for testing
__didCreateRequest(requestId: number): void {
this._requestId = requestId;
this._subscriptions.push(RCTNetworking.addListener(
'didSendNetworkData',
(args) => this.__didUploadProgress(...args)
));
this._subscriptions.push(RCTNetworking.addListener(
'didReceiveNetworkResponse',
(args) => this._didReceiveResponse(...args)
));
this._subscriptions.push(RCTNetworking.addListener(
'didReceiveNetworkData',
(args) => this._didReceiveData(...args)
));
this._subscriptions.push(RCTNetworking.addListener(
'didCompleteNetworkResponse',
(args) => this.__didCompleteResponse(...args)
));
}
// exposed for testing
__didUploadProgress(requestId: number, progress: number, total: number): void {
if (requestId === this._requestId) {
this.upload.dispatchEvent({
type: 'progress',
lengthComputable: true,
loaded: progress,
total,
});
}
}
_didReceiveResponse(requestId: number, status: number, responseHeaders: ?Object, responseURL: ?string): void {
if (requestId === this._requestId) {
this.status = status;
this.setResponseHeaders(responseHeaders);
this.setReadyState(this.HEADERS_RECEIVED);
if (responseURL || responseURL === '') {
this.responseURL = responseURL;
} else {
delete this.responseURL;
}
}
}
_didReceiveData(requestId: number, responseText: string): void {
if (requestId === this._requestId) {
if (!this.responseText) {
this.responseText = responseText;
} else {
this.responseText += responseText;
}
this._cachedResponse = undefined; // force lazy recomputation
this.setReadyState(this.LOADING);
}
}
// exposed for testing
__didCompleteResponse(requestId: number, error: string, timeOutError: boolean): void {
if (requestId === this._requestId) {
if (error) {
this.responseText = error;
this._hasError = true;
if (timeOutError) {
this._timedOut = true;
}
}
this._clearSubscriptions();
this._requestId = null;
this.setReadyState(this.DONE);
}
}
_clearSubscriptions(): void {
(this._subscriptions || []).forEach(sub => {
sub.remove();
});
this._subscriptions = [];
}
getAllResponseHeaders(): ?string {
if (!this.responseHeaders) {
// according to the spec, return null if no response has been received
return null;
}
var headers = this.responseHeaders || {};
return Object.keys(headers).map((headerName) => {
return headerName + ': ' + headers[headerName];
}).join('\n');
}
getResponseHeader(header: string): ?string {
var value = this._lowerCaseResponseHeaders[header.toLowerCase()];
return value !== undefined ? value : null;
}
setRequestHeader(header: string, value: any): void {
if (this.readyState !== this.OPENED) {
throw new Error('Request has not been opened');
}
this._headers[header.toLowerCase()] = value;
}
open(method: string, url: string, async: ?boolean): void {
/* Other optional arguments are not supported yet */
if (this.readyState !== this.UNSENT) {
throw new Error('Cannot open, already sending');
}
if (async !== undefined && !async) {
// async is default
throw new Error('Synchronous http requests are not supported');
}
if (!url) {
throw new Error('Cannot load an empty url');
}
this._reset();
this._method = method.toUpperCase();
this._url = url;
this._aborted = false;
this.setReadyState(this.OPENED);
}
sendImpl(
method: ?string,
url: ?string,
headers: Object,
data: any,
useIncrementalUpdates: boolean,
timeout: number,
): void {
RCTNetworking.sendRequest(
method,
url,
headers,
data,
useIncrementalUpdates,
timeout,
this.__didCreateRequest.bind(this),
);
}
send(data: any): void {
if (this.readyState !== this.OPENED) {
throw new Error('Request has not been opened');
}
if (this._sent) {
throw new Error('Request has already been sent');
}
this._sent = true;
const incrementalEvents = this._incrementalEvents || !!this.onreadystatechange;
this.sendImpl(
this._method,
this._url,
this._headers,
data,
incrementalEvents,
this.timeout
);
}
abort(): void {
this._aborted = true;
if (this._requestId) {
RCTNetworking.abortRequest(this._requestId);
}
// only call onreadystatechange if there is something to abort,
// below logic is per spec
if (!(this.readyState === this.UNSENT ||
(this.readyState === this.OPENED && !this._sent) ||
this.readyState === this.DONE)) {
this._reset();
this.setReadyState(this.DONE);
}
// Reset again after, in case modified in handler
this._reset();
}
setResponseHeaders(responseHeaders: ?Object): void {
this.responseHeaders = responseHeaders || null;
var headers = responseHeaders || {};
this._lowerCaseResponseHeaders =
Object.keys(headers).reduce((lcaseHeaders, headerName) => {
lcaseHeaders[headerName.toLowerCase()] = headers[headerName];
return lcaseHeaders;
}, {});
}
setReadyState(newState: number): void {
this.readyState = newState;
this.dispatchEvent({type: 'readystatechange'});
if (newState === this.DONE && !this._aborted) {
if (this._hasError) {
if (this._timedOut) {
this.dispatchEvent({type: 'timeout'});
} else {
this.dispatchEvent({type: 'error'});
}
} else {
this.dispatchEvent({type: 'load'});
}
}
}
/* global EventListener */
addEventListener(type: string, listener: EventListener): void {
// If we dont' have a 'readystatechange' event handler, we don't
// have to send repeated LOADING events with incremental updates
// to responseText, which will avoid a bunch of native -> JS
// bridge traffic.
if (type === 'readystatechange') {
this._incrementalEvents = true;
}
super.addEventListener(type, listener);
}
}
function toArrayBuffer(text: string, contentType: string): ArrayBuffer {
const {length} = text;
if (length === 0) {
return new ArrayBuffer(0);
}
const charsetMatch = contentType.match(/;\s*charset=([^;]*)/i);
const charset = charsetMatch ? charsetMatch[1].trim() : 'utf-8';
if (/^utf-?8$/i.test(charset)) {
return utf8.encode(text);
} else { //TODO: utf16 / ucs2 / utf32
const array = new Uint8Array(length);
for (let i = 0; i < length; i++) {
array[i] = text.charCodeAt(i); // Uint8Array automatically masks with 0xff
}
return array.buffer;
}
}
module.exports = XMLHttpRequest;