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The Google Closure Library is a collection of JavaScript code
designed for use with the Google Closure JavaScript Compiler.
This non-official distribution was prepared by the ClojureScript
team at http://clojure.org/
// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Wrapper class for handling XmlHttpRequests.
*
* One off requests can be sent through goog.net.XhrIo.send() or an
* instance can be created to send multiple requests. Each request uses its
* own XmlHttpRequest object and handles clearing of the event callback to
* ensure no leaks.
*
* XhrIo is event based, it dispatches events on success, failure, finishing,
* ready-state change, or progress (download and upload).
*
* The ready-state or timeout event fires first, followed by
* a generic completed event. Then the abort, error, or success event
* is fired as appropriate. Progress events are fired as they are
* received. Lastly, the ready event will fire to indicate that the
* object may be used to make another request.
*
* The error event may also be called before completed and
* ready-state-change if the XmlHttpRequest.open() or .send() methods throw.
*
* This class does not support multiple requests, queuing, or prioritization.
*
* When progress events are supported by the browser, and progress is
* enabled via .setProgressEventsEnabled(true), the
* goog.net.EventType.PROGRESS event will be the re-dispatched browser
* progress event. Additionally, a DOWNLOAD_PROGRESS or UPLOAD_PROGRESS event
* will be fired for download and upload progress respectively.
*
*/
goog.provide('goog.net.XhrIo');
goog.provide('goog.net.XhrIo.ResponseType');
goog.require('goog.Timer');
goog.require('goog.array');
goog.require('goog.asserts');
goog.require('goog.debug.entryPointRegistry');
goog.require('goog.events.EventTarget');
goog.require('goog.json');
goog.require('goog.log');
goog.require('goog.net.ErrorCode');
goog.require('goog.net.EventType');
goog.require('goog.net.HttpStatus');
goog.require('goog.net.XmlHttp');
goog.require('goog.string');
goog.require('goog.structs');
goog.require('goog.structs.Map');
goog.require('goog.uri.utils');
goog.require('goog.userAgent');
goog.forwardDeclare('goog.Uri');
/**
* Basic class for handling XMLHttpRequests.
* @param {goog.net.XmlHttpFactory=} opt_xmlHttpFactory Factory to use when
* creating XMLHttpRequest objects.
* @constructor
* @extends {goog.events.EventTarget}
*/
goog.net.XhrIo = function(opt_xmlHttpFactory) {
goog.net.XhrIo.base(this, 'constructor');
/**
* Map of default headers to add to every request, use:
* XhrIo.headers.set(name, value)
* @type {!goog.structs.Map}
*/
this.headers = new goog.structs.Map();
/**
* Optional XmlHttpFactory
* @private {goog.net.XmlHttpFactory}
*/
this.xmlHttpFactory_ = opt_xmlHttpFactory || null;
/**
* Whether XMLHttpRequest is active. A request is active from the time send()
* is called until onReadyStateChange() is complete, or error() or abort()
* is called.
* @private {boolean}
*/
this.active_ = false;
/**
* The XMLHttpRequest object that is being used for the transfer.
* @private {?goog.net.XhrLike.OrNative}
*/
this.xhr_ = null;
/**
* The options to use with the current XMLHttpRequest object.
* @private {Object}
*/
this.xhrOptions_ = null;
/**
* Last URL that was requested.
* @private {string|goog.Uri}
*/
this.lastUri_ = '';
/**
* Method for the last request.
* @private {string}
*/
this.lastMethod_ = '';
/**
* Last error code.
* @private {!goog.net.ErrorCode}
*/
this.lastErrorCode_ = goog.net.ErrorCode.NO_ERROR;
/**
* Last error message.
* @private {Error|string}
*/
this.lastError_ = '';
/**
* Used to ensure that we don't dispatch an multiple ERROR events. This can
* happen in IE when it does a synchronous load and one error is handled in
* the ready statte change and one is handled due to send() throwing an
* exception.
* @private {boolean}
*/
this.errorDispatched_ = false;
/**
* Used to make sure we don't fire the complete event from inside a send call.
* @private {boolean}
*/
this.inSend_ = false;
/**
* Used in determining if a call to {@link #onReadyStateChange_} is from
* within a call to this.xhr_.open.
* @private {boolean}
*/
this.inOpen_ = false;
/**
* Used in determining if a call to {@link #onReadyStateChange_} is from
* within a call to this.xhr_.abort.
* @private {boolean}
*/
this.inAbort_ = false;
/**
* Number of milliseconds after which an incomplete request will be aborted
* and a {@link goog.net.EventType.TIMEOUT} event raised; 0 means no timeout
* is set.
* @private {number}
*/
this.timeoutInterval_ = 0;
/**
* Timer to track request timeout.
* @private {?number}
*/
this.timeoutId_ = null;
/**
* The requested type for the response. The empty string means use the default
* XHR behavior.
* @private {goog.net.XhrIo.ResponseType}
*/
this.responseType_ = goog.net.XhrIo.ResponseType.DEFAULT;
/**
* Whether a "credentialed" request is to be sent (one that is aware of
* cookies and authentication). This is applicable only for cross-domain
* requests and more recent browsers that support this part of the HTTP Access
* Control standard.
*
* @see http://www.w3.org/TR/XMLHttpRequest/#the-withcredentials-attribute
*
* @private {boolean}
*/
this.withCredentials_ = false;
/**
* Whether progress events are enabled for this request. This is
* disabled by default because setting a progress event handler
* causes pre-flight OPTIONS requests to be sent for CORS requests,
* even in cases where a pre-flight request would not otherwise be
* sent.
*
* @see http://xhr.spec.whatwg.org/#security-considerations
*
* Note that this can cause problems for Firefox 22 and below, as an
* older "LSProgressEvent" will be dispatched by the browser. That
* progress event is no longer supported, and can lead to failures,
* including throwing exceptions.
*
* @see http://bugzilla.mozilla.org/show_bug.cgi?id=845631
* @see b/23469793
*
* @private {boolean}
*/
this.progressEventsEnabled_ = false;
/**
* True if we can use XMLHttpRequest's timeout directly.
* @private {boolean}
*/
this.useXhr2Timeout_ = false;
};
goog.inherits(goog.net.XhrIo, goog.events.EventTarget);
/**
* Response types that may be requested for XMLHttpRequests.
* @enum {string}
* @see http://www.w3.org/TR/XMLHttpRequest/#the-responsetype-attribute
*/
goog.net.XhrIo.ResponseType = {
DEFAULT: '',
TEXT: 'text',
DOCUMENT: 'document',
// Not supported as of Chrome 10.0.612.1 dev
BLOB: 'blob',
ARRAY_BUFFER: 'arraybuffer'
};
/**
* A reference to the XhrIo logger
* @private {?goog.log.Logger}
* @const
*/
goog.net.XhrIo.prototype.logger_ = goog.log.getLogger('goog.net.XhrIo');
/**
* The Content-Type HTTP header name
* @type {string}
*/
goog.net.XhrIo.CONTENT_TYPE_HEADER = 'Content-Type';
/**
* The pattern matching the 'http' and 'https' URI schemes
* @type {!RegExp}
*/
goog.net.XhrIo.HTTP_SCHEME_PATTERN = /^https?$/i;
/**
* The methods that typically come along with form data. We set different
* headers depending on whether the HTTP action is one of these.
*/
goog.net.XhrIo.METHODS_WITH_FORM_DATA = ['POST', 'PUT'];
/**
* The Content-Type HTTP header value for a url-encoded form
* @type {string}
*/
goog.net.XhrIo.FORM_CONTENT_TYPE =
'application/x-www-form-urlencoded;charset=utf-8';
/**
* The XMLHttpRequest Level two timeout delay ms property name.
*
* @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute
*
* @private {string}
* @const
*/
goog.net.XhrIo.XHR2_TIMEOUT_ = 'timeout';
/**
* The XMLHttpRequest Level two ontimeout handler property name.
*
* @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute
*
* @private {string}
* @const
*/
goog.net.XhrIo.XHR2_ON_TIMEOUT_ = 'ontimeout';
/**
* All non-disposed instances of goog.net.XhrIo created
* by {@link goog.net.XhrIo.send} are in this Array.
* @see goog.net.XhrIo.cleanup
* @private {!Array}
*/
goog.net.XhrIo.sendInstances_ = [];
/**
* Static send that creates a short lived instance of XhrIo to send the
* request.
* @see goog.net.XhrIo.cleanup
* @param {string|goog.Uri} url Uri to make request to.
* @param {?function(this:goog.net.XhrIo, ?)=} opt_callback Callback function
* for when request is complete.
* @param {string=} opt_method Send method, default: GET.
* @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=}
* opt_content Body data.
* @param {Object|goog.structs.Map=} opt_headers Map of headers to add to the
* request.
* @param {number=} opt_timeoutInterval Number of milliseconds after which an
* incomplete request will be aborted; 0 means no timeout is set.
* @param {boolean=} opt_withCredentials Whether to send credentials with the
* request. Default to false. See {@link goog.net.XhrIo#setWithCredentials}.
* @return {!goog.net.XhrIo} The sent XhrIo.
*/
goog.net.XhrIo.send = function(
url, opt_callback, opt_method, opt_content, opt_headers,
opt_timeoutInterval, opt_withCredentials) {
var x = new goog.net.XhrIo();
goog.net.XhrIo.sendInstances_.push(x);
if (opt_callback) {
x.listen(goog.net.EventType.COMPLETE, opt_callback);
}
x.listenOnce(goog.net.EventType.READY, x.cleanupSend_);
if (opt_timeoutInterval) {
x.setTimeoutInterval(opt_timeoutInterval);
}
if (opt_withCredentials) {
x.setWithCredentials(opt_withCredentials);
}
x.send(url, opt_method, opt_content, opt_headers);
return x;
};
/**
* Disposes all non-disposed instances of goog.net.XhrIo created by
* {@link goog.net.XhrIo.send}.
* {@link goog.net.XhrIo.send} cleans up the goog.net.XhrIo instance
* it creates when the request completes or fails. However, if
* the request never completes, then the goog.net.XhrIo is not disposed.
* This can occur if the window is unloaded before the request completes.
* We could have {@link goog.net.XhrIo.send} return the goog.net.XhrIo
* it creates and make the client of {@link goog.net.XhrIo.send} be
* responsible for disposing it in this case. However, this makes things
* significantly more complicated for the client, and the whole point
* of {@link goog.net.XhrIo.send} is that it's simple and easy to use.
* Clients of {@link goog.net.XhrIo.send} should call
* {@link goog.net.XhrIo.cleanup} when doing final
* cleanup on window unload.
*/
goog.net.XhrIo.cleanup = function() {
var instances = goog.net.XhrIo.sendInstances_;
while (instances.length) {
instances.pop().dispose();
}
};
/**
* Installs exception protection for all entry point introduced by
* goog.net.XhrIo instances which are not protected by
* {@link goog.debug.ErrorHandler#protectWindowSetTimeout},
* {@link goog.debug.ErrorHandler#protectWindowSetInterval}, or
* {@link goog.events.protectBrowserEventEntryPoint}.
*
* @param {goog.debug.ErrorHandler} errorHandler Error handler with which to
* protect the entry point(s).
*/
goog.net.XhrIo.protectEntryPoints = function(errorHandler) {
goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ =
errorHandler.protectEntryPoint(
goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_);
};
/**
* Disposes of the specified goog.net.XhrIo created by
* {@link goog.net.XhrIo.send} and removes it from
* {@link goog.net.XhrIo.pendingStaticSendInstances_}.
* @private
*/
goog.net.XhrIo.prototype.cleanupSend_ = function() {
this.dispose();
goog.array.remove(goog.net.XhrIo.sendInstances_, this);
};
/**
* Returns the number of milliseconds after which an incomplete request will be
* aborted, or 0 if no timeout is set.
* @return {number} Timeout interval in milliseconds.
*/
goog.net.XhrIo.prototype.getTimeoutInterval = function() {
return this.timeoutInterval_;
};
/**
* Sets the number of milliseconds after which an incomplete request will be
* aborted and a {@link goog.net.EventType.TIMEOUT} event raised; 0 means no
* timeout is set.
* @param {number} ms Timeout interval in milliseconds; 0 means none.
*/
goog.net.XhrIo.prototype.setTimeoutInterval = function(ms) {
this.timeoutInterval_ = Math.max(0, ms);
};
/**
* Sets the desired type for the response. At time of writing, this is only
* supported in very recent versions of WebKit (10.0.612.1 dev and later).
*
* If this is used, the response may only be accessed via {@link #getResponse}.
*
* @param {goog.net.XhrIo.ResponseType} type The desired type for the response.
*/
goog.net.XhrIo.prototype.setResponseType = function(type) {
this.responseType_ = type;
};
/**
* Gets the desired type for the response.
* @return {goog.net.XhrIo.ResponseType} The desired type for the response.
*/
goog.net.XhrIo.prototype.getResponseType = function() {
return this.responseType_;
};
/**
* Sets whether a "credentialed" request that is aware of cookie and
* authentication information should be made. This option is only supported by
* browsers that support HTTP Access Control. As of this writing, this option
* is not supported in IE.
*
* @param {boolean} withCredentials Whether this should be a "credentialed"
* request.
*/
goog.net.XhrIo.prototype.setWithCredentials = function(withCredentials) {
this.withCredentials_ = withCredentials;
};
/**
* Gets whether a "credentialed" request is to be sent.
* @return {boolean} The desired type for the response.
*/
goog.net.XhrIo.prototype.getWithCredentials = function() {
return this.withCredentials_;
};
/**
* Sets whether progress events are enabled for this request. Note
* that progress events require pre-flight OPTIONS request handling
* for CORS requests, and may cause trouble with older browsers. See
* progressEventsEnabled_ for details.
* @param {boolean} enabled Whether progress events should be enabled.
*/
goog.net.XhrIo.prototype.setProgressEventsEnabled = function(enabled) {
this.progressEventsEnabled_ = enabled;
};
/**
* Gets whether progress events are enabled.
* @return {boolean} Whether progress events are enabled for this request.
*/
goog.net.XhrIo.prototype.getProgressEventsEnabled = function() {
return this.progressEventsEnabled_;
};
/**
* Instance send that actually uses XMLHttpRequest to make a server call.
* @param {string|goog.Uri} url Uri to make request to.
* @param {string=} opt_method Send method, default: GET.
* @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=}
* opt_content Body data.
* @param {Object|goog.structs.Map=} opt_headers Map of headers to add to the
* request.
*/
goog.net.XhrIo.prototype.send = function(
url, opt_method, opt_content, opt_headers) {
if (this.xhr_) {
throw Error(
'[goog.net.XhrIo] Object is active with another request=' +
this.lastUri_ + '; newUri=' + url);
}
var method = opt_method ? opt_method.toUpperCase() : 'GET';
this.lastUri_ = url;
this.lastError_ = '';
this.lastErrorCode_ = goog.net.ErrorCode.NO_ERROR;
this.lastMethod_ = method;
this.errorDispatched_ = false;
this.active_ = true;
// Use the factory to create the XHR object and options
this.xhr_ = this.createXhr();
this.xhrOptions_ = this.xmlHttpFactory_ ? this.xmlHttpFactory_.getOptions() :
goog.net.XmlHttp.getOptions();
// Set up the onreadystatechange callback
this.xhr_.onreadystatechange = goog.bind(this.onReadyStateChange_, this);
// Set up upload/download progress events, if progress events are supported.
if (this.getProgressEventsEnabled() && 'onprogress' in this.xhr_) {
this.xhr_.onprogress =
goog.bind(function(e) { this.onProgressHandler_(e, true); }, this);
if (this.xhr_.upload) {
this.xhr_.upload.onprogress = goog.bind(this.onProgressHandler_, this);
}
}
/**
* Try to open the XMLHttpRequest (always async), if an error occurs here it
* is generally permission denied
* @preserveTry
*/
try {
goog.log.fine(this.logger_, this.formatMsg_('Opening Xhr'));
this.inOpen_ = true;
this.xhr_.open(method, String(url), true); // Always async!
this.inOpen_ = false;
} catch (err) {
goog.log.fine(
this.logger_, this.formatMsg_('Error opening Xhr: ' + err.message));
this.error_(goog.net.ErrorCode.EXCEPTION, err);
return;
}
// We can't use null since this won't allow requests with form data to have a
// content length specified which will cause some proxies to return a 411
// error.
var content = opt_content || '';
var headers = this.headers.clone();
// Add headers specific to this request
if (opt_headers) {
goog.structs.forEach(
opt_headers, function(value, key) { headers.set(key, value); });
}
// Find whether a content type header is set, ignoring case.
// HTTP header names are case-insensitive. See:
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
var contentTypeKey =
goog.array.find(headers.getKeys(), goog.net.XhrIo.isContentTypeHeader_);
var contentIsFormData =
(goog.global['FormData'] && (content instanceof goog.global['FormData']));
if (goog.array.contains(goog.net.XhrIo.METHODS_WITH_FORM_DATA, method) &&
!contentTypeKey && !contentIsFormData) {
// For requests typically with form data, default to the url-encoded form
// content type unless this is a FormData request. For FormData,
// the browser will automatically add a multipart/form-data content type
// with an appropriate multipart boundary.
headers.set(
goog.net.XhrIo.CONTENT_TYPE_HEADER, goog.net.XhrIo.FORM_CONTENT_TYPE);
}
// Add the headers to the Xhr object
headers.forEach(function(value, key) {
this.xhr_.setRequestHeader(key, value);
}, this);
if (this.responseType_) {
this.xhr_.responseType = this.responseType_;
}
// Set xhr_.withCredentials only when the value is different, or else in
// synchronous XMLHtppRequest.open Firefox will throw an exception.
// https://bugzilla.mozilla.org/show_bug.cgi?id=736340
if ('withCredentials' in this.xhr_ &&
this.xhr_.withCredentials !== this.withCredentials_) {
this.xhr_.withCredentials = this.withCredentials_;
}
/**
* Try to send the request, or other wise report an error (404 not found).
* @preserveTry
*/
try {
this.cleanUpTimeoutTimer_(); // Paranoid, should never be running.
if (this.timeoutInterval_ > 0) {
this.useXhr2Timeout_ = goog.net.XhrIo.shouldUseXhr2Timeout_(this.xhr_);
goog.log.fine(
this.logger_, this.formatMsg_(
'Will abort after ' + this.timeoutInterval_ +
'ms if incomplete, xhr2 ' + this.useXhr2Timeout_));
if (this.useXhr2Timeout_) {
this.xhr_[goog.net.XhrIo.XHR2_TIMEOUT_] = this.timeoutInterval_;
this.xhr_[goog.net.XhrIo.XHR2_ON_TIMEOUT_] =
goog.bind(this.timeout_, this);
} else {
this.timeoutId_ =
goog.Timer.callOnce(this.timeout_, this.timeoutInterval_, this);
}
}
goog.log.fine(this.logger_, this.formatMsg_('Sending request'));
this.inSend_ = true;
this.xhr_.send(content);
this.inSend_ = false;
} catch (err) {
goog.log.fine(this.logger_, this.formatMsg_('Send error: ' + err.message));
this.error_(goog.net.ErrorCode.EXCEPTION, err);
}
};
/**
* Determines if the argument is an XMLHttpRequest that supports the level 2
* timeout value and event.
*
* Currently, FF 21.0 OS X has the fields but won't actually call the timeout
* handler. Perhaps the confusion in the bug referenced below hasn't
* entirely been resolved.
*
* @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute
* @see https://bugzilla.mozilla.org/show_bug.cgi?id=525816
*
* @param {!goog.net.XhrLike.OrNative} xhr The request.
* @return {boolean} True if the request supports level 2 timeout.
* @private
*/
goog.net.XhrIo.shouldUseXhr2Timeout_ = function(xhr) {
return goog.userAgent.IE && goog.userAgent.isVersionOrHigher(9) &&
goog.isNumber(xhr[goog.net.XhrIo.XHR2_TIMEOUT_]) &&
goog.isDef(xhr[goog.net.XhrIo.XHR2_ON_TIMEOUT_]);
};
/**
* @param {string} header An HTTP header key.
* @return {boolean} Whether the key is a content type header (ignoring
* case.
* @private
*/
goog.net.XhrIo.isContentTypeHeader_ = function(header) {
return goog.string.caseInsensitiveEquals(
goog.net.XhrIo.CONTENT_TYPE_HEADER, header);
};
/**
* Creates a new XHR object.
* @return {!goog.net.XhrLike.OrNative} The newly created XHR object.
* @protected
*/
goog.net.XhrIo.prototype.createXhr = function() {
return this.xmlHttpFactory_ ? this.xmlHttpFactory_.createInstance() :
goog.net.XmlHttp();
};
/**
* The request didn't complete after {@link goog.net.XhrIo#timeoutInterval_}
* milliseconds; raises a {@link goog.net.EventType.TIMEOUT} event and aborts
* the request.
* @private
*/
goog.net.XhrIo.prototype.timeout_ = function() {
if (typeof goog == 'undefined') {
// If goog is undefined then the callback has occurred as the application
// is unloading and will error. Thus we let it silently fail.
} else if (this.xhr_) {
this.lastError_ =
'Timed out after ' + this.timeoutInterval_ + 'ms, aborting';
this.lastErrorCode_ = goog.net.ErrorCode.TIMEOUT;
goog.log.fine(this.logger_, this.formatMsg_(this.lastError_));
this.dispatchEvent(goog.net.EventType.TIMEOUT);
this.abort(goog.net.ErrorCode.TIMEOUT);
}
};
/**
* Something errorred, so inactivate, fire error callback and clean up
* @param {goog.net.ErrorCode} errorCode The error code.
* @param {Error} err The error object.
* @private
*/
goog.net.XhrIo.prototype.error_ = function(errorCode, err) {
this.active_ = false;
if (this.xhr_) {
this.inAbort_ = true;
this.xhr_.abort(); // Ensures XHR isn't hung (FF)
this.inAbort_ = false;
}
this.lastError_ = err;
this.lastErrorCode_ = errorCode;
this.dispatchErrors_();
this.cleanUpXhr_();
};
/**
* Dispatches COMPLETE and ERROR in case of an error. This ensures that we do
* not dispatch multiple error events.
* @private
*/
goog.net.XhrIo.prototype.dispatchErrors_ = function() {
if (!this.errorDispatched_) {
this.errorDispatched_ = true;
this.dispatchEvent(goog.net.EventType.COMPLETE);
this.dispatchEvent(goog.net.EventType.ERROR);
}
};
/**
* Abort the current XMLHttpRequest
* @param {goog.net.ErrorCode=} opt_failureCode Optional error code to use -
* defaults to ABORT.
*/
goog.net.XhrIo.prototype.abort = function(opt_failureCode) {
if (this.xhr_ && this.active_) {
goog.log.fine(this.logger_, this.formatMsg_('Aborting'));
this.active_ = false;
this.inAbort_ = true;
this.xhr_.abort();
this.inAbort_ = false;
this.lastErrorCode_ = opt_failureCode || goog.net.ErrorCode.ABORT;
this.dispatchEvent(goog.net.EventType.COMPLETE);
this.dispatchEvent(goog.net.EventType.ABORT);
this.cleanUpXhr_();
}
};
/**
* Nullifies all callbacks to reduce risks of leaks.
* @override
* @protected
*/
goog.net.XhrIo.prototype.disposeInternal = function() {
if (this.xhr_) {
// We explicitly do not call xhr_.abort() unless active_ is still true.
// This is to avoid unnecessarily aborting a successful request when
// dispose() is called in a callback triggered by a complete response, but
// in which browser cleanup has not yet finished.
// (See http://b/issue?id=1684217.)
if (this.active_) {
this.active_ = false;
this.inAbort_ = true;
this.xhr_.abort();
this.inAbort_ = false;
}
this.cleanUpXhr_(true);
}
goog.net.XhrIo.base(this, 'disposeInternal');
};
/**
* Internal handler for the XHR object's readystatechange event. This method
* checks the status and the readystate and fires the correct callbacks.
* If the request has ended, the handlers are cleaned up and the XHR object is
* nullified.
* @private
*/
goog.net.XhrIo.prototype.onReadyStateChange_ = function() {
if (this.isDisposed()) {
// This method is the target of an untracked goog.Timer.callOnce().
return;
}
if (!this.inOpen_ && !this.inSend_ && !this.inAbort_) {
// Were not being called from within a call to this.xhr_.send
// this.xhr_.abort, or this.xhr_.open, so this is an entry point
this.onReadyStateChangeEntryPoint_();
} else {
this.onReadyStateChangeHelper_();
}
};
/**
* Used to protect the onreadystatechange handler entry point. Necessary
* as {#onReadyStateChange_} maybe called from within send or abort, this
* method is only called when {#onReadyStateChange_} is called as an
* entry point.
* {@see #protectEntryPoints}
* @private
*/
goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ = function() {
this.onReadyStateChangeHelper_();
};
/**
* Helper for {@link #onReadyStateChange_}. This is used so that
* entry point calls to {@link #onReadyStateChange_} can be routed through
* {@link #onReadyStateChangeEntryPoint_}.
* @private
*/
goog.net.XhrIo.prototype.onReadyStateChangeHelper_ = function() {
if (!this.active_) {
// can get called inside abort call
return;
}
if (typeof goog == 'undefined') {
// NOTE(user): If goog is undefined then the callback has occurred as the
// application is unloading and will error. Thus we let it silently fail.
} else if (
this.xhrOptions_[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] &&
this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE &&
this.getStatus() == 2) {
// NOTE(user): In IE if send() errors on a *local* request the readystate
// is still changed to COMPLETE. We need to ignore it and allow the
// try/catch around send() to pick up the error.
goog.log.fine(
this.logger_,
this.formatMsg_('Local request error detected and ignored'));
} else {
// In IE when the response has been cached we sometimes get the callback
// from inside the send call and this usually breaks code that assumes that
// XhrIo is asynchronous. If that is the case we delay the callback
// using a timer.
if (this.inSend_ &&
this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE) {
goog.Timer.callOnce(this.onReadyStateChange_, 0, this);
return;
}
this.dispatchEvent(goog.net.EventType.READY_STATE_CHANGE);
// readyState indicates the transfer has finished
if (this.isComplete()) {
goog.log.fine(this.logger_, this.formatMsg_('Request complete'));
this.active_ = false;
try {
// Call the specific callbacks for success or failure. Only call the
// success if the status is 200 (HTTP_OK) or 304 (HTTP_CACHED)
if (this.isSuccess()) {
this.dispatchEvent(goog.net.EventType.COMPLETE);
this.dispatchEvent(goog.net.EventType.SUCCESS);
} else {
this.lastErrorCode_ = goog.net.ErrorCode.HTTP_ERROR;
this.lastError_ =
this.getStatusText() + ' [' + this.getStatus() + ']';
this.dispatchErrors_();
}
} finally {
this.cleanUpXhr_();
}
}
}
};
/**
* Internal handler for the XHR object's onprogress event. Fires both a generic
* PROGRESS event and either a DOWNLOAD_PROGRESS or UPLOAD_PROGRESS event to
* allow specific binding for each XHR progress event.
* @param {!ProgressEvent} e XHR progress event.
* @param {boolean=} opt_isDownload Whether the current progress event is from a
* download. Used to determine whether DOWNLOAD_PROGRESS or UPLOAD_PROGRESS
* event should be dispatched.
* @private
*/
goog.net.XhrIo.prototype.onProgressHandler_ = function(e, opt_isDownload) {
goog.asserts.assert(
e.type === goog.net.EventType.PROGRESS,
'goog.net.EventType.PROGRESS is of the same type as raw XHR progress.');
this.dispatchEvent(
goog.net.XhrIo.buildProgressEvent_(e, goog.net.EventType.PROGRESS));
this.dispatchEvent(
goog.net.XhrIo.buildProgressEvent_(
e, opt_isDownload ? goog.net.EventType.DOWNLOAD_PROGRESS :
goog.net.EventType.UPLOAD_PROGRESS));
};
/**
* Creates a representation of the native ProgressEvent. IE doesn't support
* constructing ProgressEvent via "new", and the alternatives (e.g.,
* ProgressEvent.initProgressEvent) are non-standard or deprecated.
* @param {!ProgressEvent} e XHR progress event.
* @param {!goog.net.EventType} eventType The type of the event.
* @return {!ProgressEvent} The progress event.
* @private
*/
goog.net.XhrIo.buildProgressEvent_ = function(e, eventType) {
return /** @type {!ProgressEvent} */ ({
type: eventType,
lengthComputable: e.lengthComputable,
loaded: e.loaded,
total: e.total
});
};
/**
* Remove the listener to protect against leaks, and nullify the XMLHttpRequest
* object.
* @param {boolean=} opt_fromDispose If this is from the dispose (don't want to
* fire any events).
* @private
*/
goog.net.XhrIo.prototype.cleanUpXhr_ = function(opt_fromDispose) {
if (this.xhr_) {
// Cancel any pending timeout event handler.
this.cleanUpTimeoutTimer_();
// Save reference so we can mark it as closed after the READY event. The
// READY event may trigger another request, thus we must nullify this.xhr_
var xhr = this.xhr_;
var clearedOnReadyStateChange =
this.xhrOptions_[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] ?
goog.nullFunction :
null;
this.xhr_ = null;
this.xhrOptions_ = null;
if (!opt_fromDispose) {
this.dispatchEvent(goog.net.EventType.READY);
}
try {
// NOTE(user): Not nullifying in FireFox can still leak if the callbacks
// are defined in the same scope as the instance of XhrIo. But, IE doesn't
// allow you to set the onreadystatechange to NULL so nullFunction is
// used.
xhr.onreadystatechange = clearedOnReadyStateChange;
} catch (e) {
// This seems to occur with a Gears HTTP request. Delayed the setting of
// this onreadystatechange until after READY is sent out and catching the
// error to see if we can track down the problem.
goog.log.error(
this.logger_,
'Problem encountered resetting onreadystatechange: ' + e.message);
}
}
};
/**
* Make sure the timeout timer isn't running.
* @private
*/
goog.net.XhrIo.prototype.cleanUpTimeoutTimer_ = function() {
if (this.xhr_ && this.useXhr2Timeout_) {
this.xhr_[goog.net.XhrIo.XHR2_ON_TIMEOUT_] = null;
}
if (goog.isNumber(this.timeoutId_)) {
goog.Timer.clear(this.timeoutId_);
this.timeoutId_ = null;
}
};
/**
* @return {boolean} Whether there is an active request.
*/
goog.net.XhrIo.prototype.isActive = function() {
return !!this.xhr_;
};
/**
* @return {boolean} Whether the request has completed.
*/
goog.net.XhrIo.prototype.isComplete = function() {
return this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE;
};
/**
* @return {boolean} Whether the request completed with a success.
*/
goog.net.XhrIo.prototype.isSuccess = function() {
var status = this.getStatus();
// A zero status code is considered successful for local files.
return goog.net.HttpStatus.isSuccess(status) ||
status === 0 && !this.isLastUriEffectiveSchemeHttp_();
};
/**
* @return {boolean} whether the effective scheme of the last URI that was
* fetched was 'http' or 'https'.
* @private
*/
goog.net.XhrIo.prototype.isLastUriEffectiveSchemeHttp_ = function() {
var scheme = goog.uri.utils.getEffectiveScheme(String(this.lastUri_));
return goog.net.XhrIo.HTTP_SCHEME_PATTERN.test(scheme);
};
/**
* Get the readystate from the Xhr object
* Will only return correct result when called from the context of a callback
* @return {goog.net.XmlHttp.ReadyState} goog.net.XmlHttp.ReadyState.*.
*/
goog.net.XhrIo.prototype.getReadyState = function() {
return this.xhr_ ?
/** @type {goog.net.XmlHttp.ReadyState} */ (this.xhr_.readyState) :
goog.net.XmlHttp.ReadyState
.UNINITIALIZED;
};
/**
* Get the status from the Xhr object
* Will only return correct result when called from the context of a callback
* @return {number} Http status.
*/
goog.net.XhrIo.prototype.getStatus = function() {
/**
* IE doesn't like you checking status until the readystate is greater than 2
* (i.e. it is receiving or complete). The try/catch is used for when the
* page is unloading and an ERROR_NOT_AVAILABLE may occur when accessing xhr_.
* @preserveTry
*/
try {
return this.getReadyState() > goog.net.XmlHttp.ReadyState.LOADED ?
this.xhr_.status :
-1;
} catch (e) {
return -1;
}
};
/**
* Get the status text from the Xhr object
* Will only return correct result when called from the context of a callback
* @return {string} Status text.
*/
goog.net.XhrIo.prototype.getStatusText = function() {
/**
* IE doesn't like you checking status until the readystate is greater than 2
* (i.e. it is receiving or complete). The try/catch is used for when the
* page is unloading and an ERROR_NOT_AVAILABLE may occur when accessing xhr_.
* @preserveTry
*/
try {
return this.getReadyState() > goog.net.XmlHttp.ReadyState.LOADED ?
this.xhr_.statusText :
'';
} catch (e) {
goog.log.fine(this.logger_, 'Can not get status: ' + e.message);
return '';
}
};
/**
* Get the last Uri that was requested
* @return {string} Last Uri.
*/
goog.net.XhrIo.prototype.getLastUri = function() {
return String(this.lastUri_);
};
/**
* Get the response text from the Xhr object
* Will only return correct result when called from the context of a callback.
* @return {string} Result from the server, or '' if no result available.
*/
goog.net.XhrIo.prototype.getResponseText = function() {
/** @preserveTry */
try {
return this.xhr_ ? this.xhr_.responseText : '';
} catch (e) {
// http://www.w3.org/TR/XMLHttpRequest/#the-responsetext-attribute
// states that responseText should return '' (and responseXML null)
// when the state is not LOADING or DONE. Instead, IE can
// throw unexpected exceptions, for example when a request is aborted
// or no data is available yet.
goog.log.fine(this.logger_, 'Can not get responseText: ' + e.message);
return '';
}
};
/**
* Get the response body from the Xhr object. This property is only available
* in IE since version 7 according to MSDN:
* http://msdn.microsoft.com/en-us/library/ie/ms534368(v=vs.85).aspx
* Will only return correct result when called from the context of a callback.
*
* One option is to construct a VBArray from the returned object and convert
* it to a JavaScript array using the toArray method:
* {@code (new window['VBArray'](xhrIo.getResponseBody())).toArray()}
* This will result in an array of numbers in the range of [0..255]
*
* Another option is to use the VBScript CStr method to convert it into a
* string as outlined in http://stackoverflow.com/questions/1919972
*
* @return {Object} Binary result from the server or null if not available.
*/
goog.net.XhrIo.prototype.getResponseBody = function() {
/** @preserveTry */
try {
if (this.xhr_ && 'responseBody' in this.xhr_) {
return this.xhr_['responseBody'];
}
} catch (e) {
// IE can throw unexpected exceptions, for example when a request is aborted
// or no data is yet available.
goog.log.fine(this.logger_, 'Can not get responseBody: ' + e.message);
}
return null;
};
/**
* Get the response XML from the Xhr object
* Will only return correct result when called from the context of a callback.
* @return {Document} The DOM Document representing the XML file, or null
* if no result available.
*/
goog.net.XhrIo.prototype.getResponseXml = function() {
/** @preserveTry */
try {
return this.xhr_ ? this.xhr_.responseXML : null;
} catch (e) {
goog.log.fine(this.logger_, 'Can not get responseXML: ' + e.message);
return null;
}
};
/**
* Get the response and evaluates it as JSON from the Xhr object
* Will only return correct result when called from the context of a callback
* @param {string=} opt_xssiPrefix Optional XSSI prefix string to use for
* stripping of the response before parsing. This needs to be set only if
* your backend server prepends the same prefix string to the JSON response.
* @return {Object|undefined} JavaScript object.
*/
goog.net.XhrIo.prototype.getResponseJson = function(opt_xssiPrefix) {
if (!this.xhr_) {
return undefined;
}
var responseText = this.xhr_.responseText;
if (opt_xssiPrefix && responseText.indexOf(opt_xssiPrefix) == 0) {
responseText = responseText.substring(opt_xssiPrefix.length);
}
return goog.json.parse(responseText);
};
/**
* Get the response as the type specificed by {@link #setResponseType}. At time
* of writing, this is only directly supported in very recent versions of WebKit
* (10.0.612.1 dev and later). If the field is not supported directly, we will
* try to emulate it.
*
* Emulating the response means following the rules laid out at
* http://www.w3.org/TR/XMLHttpRequest/#the-response-attribute
*
* On browsers with no support for this (Chrome < 10, Firefox < 4, etc), only
* response types of DEFAULT or TEXT may be used, and the response returned will
* be the text response.
*
* On browsers with Mozilla's draft support for array buffers (Firefox 4, 5),
* only response types of DEFAULT, TEXT, and ARRAY_BUFFER may be used, and the
* response returned will be either the text response or the Mozilla
* implementation of the array buffer response.
*
* On browsers will full support, any valid response type supported by the
* browser may be used, and the response provided by the browser will be
* returned.
*
* @return {*} The response.
*/
goog.net.XhrIo.prototype.getResponse = function() {
/** @preserveTry */
try {
if (!this.xhr_) {
return null;
}
if ('response' in this.xhr_) {
return this.xhr_.response;
}
switch (this.responseType_) {
case goog.net.XhrIo.ResponseType.DEFAULT:
case goog.net.XhrIo.ResponseType.TEXT:
return this.xhr_.responseText;
// DOCUMENT and BLOB don't need to be handled here because they are
// introduced in the same spec that adds the .response field, and would
// have been caught above.
// ARRAY_BUFFER needs an implementation for Firefox 4, where it was
// implemented using a draft spec rather than the final spec.
case goog.net.XhrIo.ResponseType.ARRAY_BUFFER:
if ('mozResponseArrayBuffer' in this.xhr_) {
return this.xhr_.mozResponseArrayBuffer;
}
}
// Fell through to a response type that is not supported on this browser.
goog.log.error(
this.logger_, 'Response type ' + this.responseType_ + ' is not ' +
'supported on this browser');
return null;
} catch (e) {
goog.log.fine(this.logger_, 'Can not get response: ' + e.message);
return null;
}
};
/**
* Get the value of the response-header with the given name from the Xhr object
* Will only return correct result when called from the context of a callback
* and the request has completed
* @param {string} key The name of the response-header to retrieve.
* @return {string|undefined} The value of the response-header named key.
*/
goog.net.XhrIo.prototype.getResponseHeader = function(key) {
return this.xhr_ && this.isComplete() ? this.xhr_.getResponseHeader(key) :
undefined;
};
/**
* Gets the text of all the headers in the response.
* Will only return correct result when called from the context of a callback
* and the request has completed.
* @return {string} The value of the response headers or empty string.
*/
goog.net.XhrIo.prototype.getAllResponseHeaders = function() {
return this.xhr_ && this.isComplete() ? this.xhr_.getAllResponseHeaders() :
'';
};
/**
* Returns all response headers as a key-value map.
* Multiple values for the same header key can be combined into one,
* separated by a comma and a space.
* Note that the native getResponseHeader method for retrieving a single header
* does a case insensitive match on the header name. This method does not
* include any case normalization logic, it will just return a key-value
* representation of the headers.
* See: http://www.w3.org/TR/XMLHttpRequest/#the-getresponseheader()-method
* @return {!Object} An object with the header keys as keys
* and header values as values.
*/
goog.net.XhrIo.prototype.getResponseHeaders = function() {
var headersObject = {};
var headersArray = this.getAllResponseHeaders().split('\r\n');
for (var i = 0; i < headersArray.length; i++) {
if (goog.string.isEmptyOrWhitespace(headersArray[i])) {
continue;
}
var keyValue = goog.string.splitLimit(headersArray[i], ': ', 2);
if (headersObject[keyValue[0]]) {
headersObject[keyValue[0]] += ', ' + keyValue[1];
} else {
headersObject[keyValue[0]] = keyValue[1];
}
}
return headersObject;
};
/**
* Get the last error message
* @return {goog.net.ErrorCode} Last error code.
*/
goog.net.XhrIo.prototype.getLastErrorCode = function() {
return this.lastErrorCode_;
};
/**
* Get the last error message
* @return {string} Last error message.
*/
goog.net.XhrIo.prototype.getLastError = function() {
return goog.isString(this.lastError_) ? this.lastError_ :
String(this.lastError_);
};
/**
* Adds the last method, status and URI to the message. This is used to add
* this information to the logging calls.
* @param {string} msg The message text that we want to add the extra text to.
* @return {string} The message with the extra text appended.
* @private
*/
goog.net.XhrIo.prototype.formatMsg_ = function(msg) {
return msg + ' [' + this.lastMethod_ + ' ' + this.lastUri_ + ' ' +
this.getStatus() + ']';
};
// Register the xhr handler as an entry point, so that
// it can be monitored for exception handling, etc.
goog.debug.entryPointRegistry.register(
/**
* @param {function(!Function): !Function} transformer The transforming
* function.
*/
function(transformer) {
goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ =
transformer(goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_);
});
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