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320 lines
8.8 KiB
320 lines
8.8 KiB
var capability = require('./capability');
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var inherits = require('inherits');
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var response = require('./response');
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var stream = require('readable-stream');
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var toArrayBuffer = require('to-arraybuffer');
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var IncomingMessage = response.IncomingMessage;
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var rStates = response.readyStates;
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function decideMode(preferBinary, useFetch) {
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if (capability.fetch && useFetch) {
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return 'fetch';
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} else if (capability.mozchunkedarraybuffer) {
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return 'moz-chunked-arraybuffer';
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} else if (capability.msstream) {
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return 'ms-stream';
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} else if (capability.arraybuffer && preferBinary) {
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return 'arraybuffer';
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} else if (capability.vbArray && preferBinary) {
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return 'text:vbarray';
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} else {
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return 'text';
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}
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}
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var ClientRequest = (module.exports = function (opts) {
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var self = this;
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stream.Writable.call(self);
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self._opts = opts;
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self._body = [];
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self._headers = {};
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if (opts.auth) self.setHeader('Authorization', 'Basic ' + new Buffer(opts.auth).toString('base64'));
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Object.keys(opts.headers).forEach(function (name) {
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self.setHeader(name, opts.headers[name]);
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});
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var preferBinary;
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var useFetch = true;
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if (opts.mode === 'disable-fetch' || ('requestTimeout' in opts && !capability.abortController)) {
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// If the use of XHR should be preferred. Not typically needed.
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useFetch = false;
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preferBinary = true;
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} else if (opts.mode === 'prefer-streaming') {
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// If streaming is a high priority but binary compatibility and
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// the accuracy of the 'content-type' header aren't
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preferBinary = false;
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} else if (opts.mode === 'allow-wrong-content-type') {
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// If streaming is more important than preserving the 'content-type' header
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preferBinary = !capability.overrideMimeType;
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} else if (!opts.mode || opts.mode === 'default' || opts.mode === 'prefer-fast') {
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// Use binary if text streaming may corrupt data or the content-type header, or for speed
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preferBinary = true;
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} else {
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throw new Error('Invalid value for opts.mode');
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}
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self._mode = decideMode(preferBinary, useFetch);
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self._fetchTimer = null;
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self.on('finish', function () {
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self._onFinish();
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});
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});
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inherits(ClientRequest, stream.Writable);
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ClientRequest.prototype.setHeader = function (name, value) {
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var self = this;
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var lowerName = name.toLowerCase();
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// This check is not necessary, but it prevents warnings from browsers about setting unsafe
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// headers. To be honest I'm not entirely sure hiding these warnings is a good thing, but
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// http-browserify did it, so I will too.
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if (unsafeHeaders.indexOf(lowerName) !== -1) return;
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self._headers[lowerName] = {
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name: name,
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value: value
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};
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};
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ClientRequest.prototype.getHeader = function (name) {
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var header = this._headers[name.toLowerCase()];
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if (header) return header.value;
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return null;
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};
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ClientRequest.prototype.removeHeader = function (name) {
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var self = this;
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delete self._headers[name.toLowerCase()];
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};
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ClientRequest.prototype._onFinish = function () {
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var self = this;
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if (self._destroyed) return;
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var opts = self._opts;
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var headersObj = self._headers;
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var body = null;
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if (opts.method !== 'GET' && opts.method !== 'HEAD') {
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if (capability.arraybuffer) {
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body = toArrayBuffer(Buffer.concat(self._body));
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} else if (capability.blobConstructor) {
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body = new global.Blob(
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self._body.map(function (buffer) {
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return toArrayBuffer(buffer);
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}),
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{
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type: (headersObj['content-type'] || {}).value || ''
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}
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);
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} else {
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// get utf8 string
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body = Buffer.concat(self._body).toString();
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}
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}
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// create flattened list of headers
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var headersList = [];
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Object.keys(headersObj).forEach(function (keyName) {
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var name = headersObj[keyName].name;
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var value = headersObj[keyName].value;
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if (Array.isArray(value)) {
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value.forEach(function (v) {
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headersList.push([name, v]);
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});
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} else {
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headersList.push([name, value]);
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}
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});
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if (self._mode === 'fetch') {
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var signal = null;
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var fetchTimer = null;
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if (capability.abortController) {
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var controller = new AbortController();
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signal = controller.signal;
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self._fetchAbortController = controller;
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if ('requestTimeout' in opts && opts.requestTimeout !== 0) {
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self._fetchTimer = global.setTimeout(function () {
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self.emit('requestTimeout');
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if (self._fetchAbortController) self._fetchAbortController.abort();
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}, opts.requestTimeout);
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}
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}
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global
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.fetch(self._opts.url, {
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method: self._opts.method,
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headers: headersList,
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body: body || undefined,
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mode: 'cors',
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credentials: opts.withCredentials ? 'include' : 'same-origin',
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signal: signal
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})
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.then(
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function (response) {
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self._fetchResponse = response;
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self._connect();
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},
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function (reason) {
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global.clearTimeout(self._fetchTimer);
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if (!self._destroyed) self.emit('error', reason);
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}
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);
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} else {
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var xhr = (self._xhr = new global.XMLHttpRequest());
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try {
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xhr.open(self._opts.method, self._opts.url, true);
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} catch (err) {
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process.nextTick(function () {
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self.emit('error', err);
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});
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return;
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}
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// Can't set responseType on really old browsers
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if ('responseType' in xhr) xhr.responseType = self._mode.split(':')[0];
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if ('withCredentials' in xhr) xhr.withCredentials = !!opts.withCredentials;
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if (self._mode === 'text' && 'overrideMimeType' in xhr) xhr.overrideMimeType('text/plain; charset=x-user-defined');
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if ('requestTimeout' in opts) {
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xhr.timeout = opts.requestTimeout;
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xhr.ontimeout = function () {
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self.emit('requestTimeout');
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};
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}
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headersList.forEach(function (header) {
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xhr.setRequestHeader(header[0], header[1]);
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});
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self._response = null;
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xhr.onreadystatechange = function () {
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switch (xhr.readyState) {
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case rStates.LOADING:
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case rStates.DONE:
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self._onXHRProgress();
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break;
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}
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};
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// Necessary for streaming in Firefox, since xhr.response is ONLY defined
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// in onprogress, not in onreadystatechange with xhr.readyState = 3
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if (self._mode === 'moz-chunked-arraybuffer') {
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xhr.onprogress = function () {
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self._onXHRProgress();
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};
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}
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xhr.onerror = function () {
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if (self._destroyed) return;
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self.emit('error', new Error('XHR error'));
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};
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try {
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xhr.send(body);
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} catch (err) {
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process.nextTick(function () {
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self.emit('error', err);
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});
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return;
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}
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}
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};
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/**
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* Checks if xhr.status is readable and non-zero, indicating no error.
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* Even though the spec says it should be available in readyState 3,
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* accessing it throws an exception in IE8
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*/
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function statusValid(xhr) {
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try {
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var status = xhr.status;
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return status !== null && status !== 0;
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} catch (e) {
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return false;
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}
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}
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ClientRequest.prototype._onXHRProgress = function () {
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var self = this;
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if (!statusValid(self._xhr) || self._destroyed) return;
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if (!self._response) self._connect();
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self._response._onXHRProgress();
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};
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ClientRequest.prototype._connect = function () {
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var self = this;
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if (self._destroyed) return;
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self._response = new IncomingMessage(self._xhr, self._fetchResponse, self._mode, self._fetchTimer);
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self._response.on('error', function (err) {
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self.emit('error', err);
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});
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self.emit('response', self._response);
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};
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ClientRequest.prototype._write = function (chunk, encoding, cb) {
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var self = this;
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self._body.push(chunk);
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cb();
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};
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ClientRequest.prototype.abort = ClientRequest.prototype.destroy = function () {
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var self = this;
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self._destroyed = true;
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global.clearTimeout(self._fetchTimer);
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if (self._response) self._response._destroyed = true;
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if (self._xhr) self._xhr.abort();
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else if (self._fetchAbortController) self._fetchAbortController.abort();
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};
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ClientRequest.prototype.end = function (data, encoding, cb) {
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var self = this;
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if (typeof data === 'function') {
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cb = data;
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data = undefined;
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}
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stream.Writable.prototype.end.call(self, data, encoding, cb);
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};
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ClientRequest.prototype.flushHeaders = function () {};
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ClientRequest.prototype.setTimeout = function () {};
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ClientRequest.prototype.setNoDelay = function () {};
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ClientRequest.prototype.setSocketKeepAlive = function () {};
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// Taken from http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader%28%29-method
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var unsafeHeaders = [
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'accept-charset',
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'accept-encoding',
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'access-control-request-headers',
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'access-control-request-method',
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'connection',
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'content-length',
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'cookie',
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'cookie2',
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'date',
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'dnt',
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'expect',
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'host',
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'keep-alive',
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'origin',
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'referer',
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'te',
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'trailer',
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'transfer-encoding',
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'upgrade',
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'user-agent',
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'via'
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];
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