https://github.com/jonnyreeves/fetch-readablestream/blob/master/README.md
目前为
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.icu/scripts/29306/191128/fetch-readablestream.js
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.fetchStream = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = defaultTransportFactory;
var _fetch = require('./fetch');
var _fetch2 = _interopRequireDefault(_fetch);
var _xhr = require('./xhr');
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
// selected is used to cache the detected transport.
var selected = null;
// defaultTransportFactory selects the most appropriate transport based on the
// capabilities of the current environment.
function defaultTransportFactory() {
if (!selected) {
selected = detectTransport();
}
return selected;
}
function detectTransport() {
if (typeof Response !== 'undefined' && Response.prototype.hasOwnProperty("body")) {
// fetch with ReadableStream support.
return _fetch2.default;
}
var mozChunked = 'moz-chunked-arraybuffer';
if (supportsXhrResponseType(mozChunked)) {
// Firefox, ArrayBuffer support.
return (0, _xhr.makeXhrTransport)({
responseType: mozChunked,
responseParserFactory: function responseParserFactory() {
return function (response) {
return new Uint8Array(response);
};
}
});
}
// Bog-standard, expensive, text concatenation with byte encoding :(
return (0, _xhr.makeXhrTransport)({
responseType: 'text',
responseParserFactory: function responseParserFactory() {
var encoder = new TextEncoder();
var offset = 0;
return function (response) {
var chunk = response.substr(offset);
offset = response.length;
return encoder.encode(chunk, { stream: true });
};
}
});
}
function supportsXhrResponseType(type) {
try {
var tmpXhr = new XMLHttpRequest();
tmpXhr.responseType = type;
return tmpXhr.responseType === type;
} catch (e) {/* IE throws on setting responseType to an unsupported value */}
return false;
}
},{"./fetch":3,"./xhr":6}],2:[function(require,module,exports){
module.exports = require("./index").default;
},{"./index":4}],3:[function(require,module,exports){
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = fetchRequest;
// thin wrapper around `fetch()` to ensure we only expose the properties provided by
// the XHR polyfil; / fetch-readablestream Response API.
function fetchRequest(url, options) {
return fetch(url, options).then(function (r) {
return {
body: r.body,
headers: r.headers,
ok: r.ok,
status: r.status,
statusText: r.statusText,
url: r.url
};
});
}
},{}],4:[function(require,module,exports){
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = fetchStream;
var _defaultTransportFactory = require('./defaultTransportFactory');
var _defaultTransportFactory2 = _interopRequireDefault(_defaultTransportFactory);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function fetchStream(url) {
var options = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];
var transport = options.transport;
if (!transport) {
transport = fetchStream.transportFactory();
}
return transport(url, options);
}
// override this function to delegate to an alternative transport function selection
// strategy; useful when testing.
fetchStream.transportFactory = _defaultTransportFactory2.default;
},{"./defaultTransportFactory":1}],5:[function(require,module,exports){
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
// Headers is a partial polyfill for the HTML5 Headers class.
var Headers = exports.Headers = function () {
function Headers() {
var _this = this;
var h = arguments.length <= 0 || arguments[0] === undefined ? {} : arguments[0];
_classCallCheck(this, Headers);
this.h = {};
if (h instanceof Headers) {
h.forEach(function (value, key) {
return _this.append(key, value);
});
}
Object.getOwnPropertyNames(h).forEach(function (key) {
return _this.append(key, h[key]);
});
}
_createClass(Headers, [{
key: "append",
value: function append(key, value) {
key = key.toLowerCase();
if (!Array.isArray(this.h[key])) {
this.h[key] = [];
}
this.h[key].push(value);
}
}, {
key: "set",
value: function set(key, value) {
this.h[key.toLowerCase()] = [value];
}
}, {
key: "has",
value: function has(key) {
return Array.isArray(this.h[key.toLowerCase()]);
}
}, {
key: "get",
value: function get(key) {
key = key.toLowerCase();
if (Array.isArray(this.h[key])) {
return this.h[key][0];
}
}
}, {
key: "getAll",
value: function getAll(key) {
return this.h[key.toLowerCase()].concat();
}
}, {
key: "entries",
value: function entries() {
var items = [];
this.forEach(function (value, key) {
items.push([key, value]);
});
return makeIterator(items);
}
// forEach is not part of the official spec.
}, {
key: "forEach",
value: function forEach(callback, thisArg) {
var _this2 = this;
Object.getOwnPropertyNames(this.h).forEach(function (key) {
_this2.h[key].forEach(function (value) {
return callback.call(thisArg, value, key, _this2);
});
}, this);
}
}]);
return Headers;
}();
function makeIterator(items) {
return _defineProperty({
next: function next() {
var value = items.shift();
return {
done: value === undefined,
value: value
};
}
}, Symbol.iterator, function () {
return this;
});
}
},{}],6:[function(require,module,exports){
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.makeXhrTransport = makeXhrTransport;
exports.parseResposneHeaders = parseResposneHeaders;
var _Headers = require('./polyfill/Headers');
function makeXhrTransport(_ref) {
var responseType = _ref.responseType;
var responseParserFactory = _ref.responseParserFactory;
return function xhrTransport(url, options) {
var xhr = new XMLHttpRequest();
var responseParser = responseParserFactory();
var responseStreamController = void 0;
var cancelled = false;
var responseStream = new ReadableStream({
start: function start(c) {
responseStreamController = c;
},
cancel: function cancel() {
cancelled = true;
xhr.abort();
}
});
var _options$method = options.method;
var method = _options$method === undefined ? 'GET' : _options$method;
xhr.open(method, url);
xhr.responseType = responseType;
xhr.withCredentials = options.credentials !== 'omit';
if (options.headers) {
var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;
try {
for (var _iterator = options.headers.entries()[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
var pair = _step.value;
xhr.setRequestHeader(pair[0], pair[1]);
}
} catch (err) {
_didIteratorError = true;
_iteratorError = err;
} finally {
try {
if (!_iteratorNormalCompletion && _iterator.return) {
_iterator.return();
}
} finally {
if (_didIteratorError) {
throw _iteratorError;
}
}
}
}
return new Promise(function (resolve, reject) {
if (options.body && (method === 'GET' || method === 'HEAD')) {
reject(new TypeError("Failed to execute 'fetchStream' on 'Window': Request with GET/HEAD method cannot have body"));
}
xhr.onreadystatechange = function () {
if (xhr.readyState === xhr.HEADERS_RECEIVED) {
return resolve({
body: responseStream,
headers: parseResposneHeaders(xhr.getAllResponseHeaders()),
ok: xhr.status >= 200 && xhr.status < 300,
status: xhr.status,
statusText: xhr.statusText,
url: makeResponseUrl(xhr.responseURL, url)
});
}
};
xhr.onerror = function () {
return reject(new TypeError('Network request failed'));
};
xhr.ontimeout = function () {
reject(new TypeError('Network request failed'));
};
xhr.onprogress = function () {
if (!cancelled) {
var bytes = responseParser(xhr.response);
responseStreamController.enqueue(bytes);
}
};
xhr.onload = function () {
responseStreamController.close();
};
xhr.send(options.body);
});
};
}
function makeHeaders() {
// Prefer the native method if provided by the browser.
if (typeof Headers !== 'undefined') {
return new Headers();
}
return new _Headers.Headers();
}
function makeResponseUrl(responseUrl, requestUrl) {
if (!responseUrl) {
// best guess; note this will not correctly handle redirects.
if (requestUrl.substring(0, 4) !== "http") {
return location.origin + requestUrl;
}
return requestUrl;
}
return responseUrl;
}
function parseResposneHeaders(str) {
var hdrs = makeHeaders();
if (str) {
var pairs = str.split('\r\n');
for (var i = 0; i < pairs.length; i++) {
var p = pairs[i];
var index = p.indexOf(': ');
if (index > 0) {
var key = p.substring(0, index);
var value = p.substring(index + 2);
hdrs.append(key, value);
}
}
}
return hdrs;
}
},{"./polyfill/Headers":5}]},{},[2])(2)
});