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Viewing file:     xhr.js (3.85 KB)      -rw-r--r--

var AWS = require('../core');
var EventEmitter = require('events').EventEmitter;
require('../http');

/**
 * @api private
 */
AWS.XHRClient = AWS.util.inherit({
  handleRequest: function handleRequest(httpRequest, httpOptions, callback, errCallback) {
    var self = this;
    var endpoint = httpRequest.endpoint;
    var emitter = new EventEmitter();
    var href = endpoint.protocol + '//' + endpoint.hostname;
    if (endpoint.port !== 80 && endpoint.port !== 443) {
      href += ':' + endpoint.port;
    }
    href += httpRequest.path;

    var xhr = new XMLHttpRequest(), headersEmitted = false;
    httpRequest.stream = xhr;

    xhr.addEventListener('readystatechange', function() {
      try {
        if (xhr.status === 0) return; // 0 code is invalid
      } catch (e) { return; }

      if (this.readyState >= this.HEADERS_RECEIVED && !headersEmitted) {
        emitter.statusCode = xhr.status;
        emitter.headers = self.parseHeaders(xhr.getAllResponseHeaders());
        emitter.emit(
          'headers',
          emitter.statusCode,
          emitter.headers,
          xhr.statusText
        );
        headersEmitted = true;
      }
      if (this.readyState === this.DONE) {
        self.finishRequest(xhr, emitter);
      }
    }, false);
    xhr.upload.addEventListener('progress', function (evt) {
      emitter.emit('sendProgress', evt);
    });
    xhr.addEventListener('progress', function (evt) {
      emitter.emit('receiveProgress', evt);
    }, false);
    xhr.addEventListener('timeout', function () {
      errCallback(AWS.util.error(new Error('Timeout'), {code: 'TimeoutError'}));
    }, false);
    xhr.addEventListener('error', function () {
      errCallback(AWS.util.error(new Error('Network Failure'), {
        code: 'NetworkingError'
      }));
    }, false);
    xhr.addEventListener('abort', function () {
      errCallback(AWS.util.error(new Error('Request aborted'), {
        code: 'RequestAbortedError'
      }));
    }, false);

    callback(emitter);
    xhr.open(httpRequest.method, href, httpOptions.xhrAsync !== false);
    AWS.util.each(httpRequest.headers, function (key, value) {
      if (key !== 'Content-Length' && key !== 'User-Agent' && key !== 'Host') {
        xhr.setRequestHeader(key, value);
      }
    });

    if (httpOptions.timeout && httpOptions.xhrAsync !== false) {
      xhr.timeout = httpOptions.timeout;
    }

    if (httpOptions.xhrWithCredentials) {
      xhr.withCredentials = true;
    }
    try { xhr.responseType = 'arraybuffer'; } catch (e) {}

    try {
      if (httpRequest.body) {
        xhr.send(httpRequest.body);
      } else {
        xhr.send();
      }
    } catch (err) {
      if (httpRequest.body && typeof httpRequest.body.buffer === 'object') {
        xhr.send(httpRequest.body.buffer); // send ArrayBuffer directly
      } else {
        throw err;
      }
    }

    return emitter;
  },

  parseHeaders: function parseHeaders(rawHeaders) {
    var headers = {};
    AWS.util.arrayEach(rawHeaders.split(/\r?\n/), function (line) {
      var key = line.split(':', 1)[0];
      var value = line.substring(key.length + 2);
      if (key.length > 0) headers[key.toLowerCase()] = value;
    });
    return headers;
  },

  finishRequest: function finishRequest(xhr, emitter) {
    var buffer;
    if (xhr.responseType === 'arraybuffer' && xhr.response) {
      var ab = xhr.response;
      buffer = new AWS.util.Buffer(ab.byteLength);
      var view = new Uint8Array(ab);
      for (var i = 0; i < buffer.length; ++i) {
        buffer[i] = view[i];
      }
    }

    try {
      if (!buffer && typeof xhr.responseText === 'string') {
        buffer = new AWS.util.Buffer(xhr.responseText);
      }
    } catch (e) {}

    if (buffer) emitter.emit('data', buffer);
    emitter.emit('end');
  }
});

/**
 * @api private
 */
AWS.HttpClient.prototype = AWS.XHRClient.prototype;

/**
 * @api private
 */
AWS.HttpClient.streamsApiVersion = 1;