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ff3d7c76a6
The async API is exposed as AsyncResource which is functionally equivalent to Resource. The latter is now a wrapper around AsyncResource.
503 lines
16 KiB
JavaScript
503 lines
16 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Bookmarks Sync.
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*
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* The Initial Developer of the Original Code is Mozilla.
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* Portions created by the Initial Developer are Copyright (C) 2007
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Dan Mills <thunder@mozilla.com>
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* Anant Narayanan <anant@kix.in>
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* Philipp von Weitershausen <philipp@weitershausen.de>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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const EXPORTED_SYMBOLS = ["Resource", "AsyncResource"];
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cr = Components.results;
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const Cu = Components.utils;
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Cu.import("resource://services-sync/auth.js");
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Cu.import("resource://services-sync/constants.js");
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Cu.import("resource://services-sync/ext/Observers.js");
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Cu.import("resource://services-sync/ext/Preferences.js");
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Cu.import("resource://services-sync/ext/Sync.js");
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Cu.import("resource://services-sync/log4moz.js");
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Cu.import("resource://services-sync/util.js");
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/*
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* AsyncResource represents a remote network resource, identified by a URI.
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* Create an instance like so:
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*
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* let resource = new AsyncResource("http://foobar.com/path/to/resource");
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*
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* The 'resource' object has the following methods to issue HTTP requests
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* of the corresponding HTTP methods:
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*
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* get(callback)
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* put(data, callback)
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* post(data, callback)
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* delete(callback)
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*
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* 'callback' is a function with the following signature:
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*
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* function callback(error, result) {...}
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*
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* 'error' will be null on successful requests. Likewise, result will not be
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* passes (=undefined) when an error occurs. Note that this is independent of
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* the status of the HTTP response.
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*/
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function AsyncResource(uri) {
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this._log = Log4Moz.repository.getLogger(this._logName);
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this._log.level =
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Log4Moz.Level[Utils.prefs.getCharPref("log.logger.network.resources")];
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this.uri = uri;
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this._headers = {};
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this._onComplete = Utils.bind2(this, this._onComplete);
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}
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AsyncResource.prototype = {
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_logName: "Net.Resource",
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// ** {{{ Resource.authenticator }}} **
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//
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// Getter and setter for the authenticator module
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// responsible for this particular resource. The authenticator
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// module may modify the headers to perform authentication
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// while performing a request for the resource, for example.
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get authenticator() {
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if (this._authenticator)
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return this._authenticator;
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else
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return Auth.lookupAuthenticator(this.spec);
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},
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set authenticator(value) {
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this._authenticator = value;
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},
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// ** {{{ Resource.headers }}} **
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//
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// Headers to be included when making a request for the resource.
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// Note: Header names should be all lower case, there's no explicit
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// check for duplicates due to case!
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get headers() {
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return this.authenticator.onRequest(this._headers);
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},
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set headers(value) {
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this._headers = value;
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},
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setHeader: function Res_setHeader() {
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if (arguments.length % 2)
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throw "setHeader only accepts arguments in multiples of 2";
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for (let i = 0; i < arguments.length; i += 2) {
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this._headers[arguments[i].toLowerCase()] = arguments[i + 1];
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}
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},
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// ** {{{ Resource.uri }}} **
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//
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// URI representing this resource.
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get uri() {
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return this._uri;
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},
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set uri(value) {
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if (typeof value == 'string')
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this._uri = Utils.makeURI(value);
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else
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this._uri = value;
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},
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// ** {{{ Resource.spec }}} **
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//
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// Get the string representation of the URI.
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get spec() {
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if (this._uri)
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return this._uri.spec;
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return null;
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},
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// ** {{{ Resource.data }}} **
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//
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// Get and set the data encapulated in the resource.
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_data: null,
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get data() this._data,
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set data(value) {
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this._data = value;
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},
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// ** {{{ Resource._createRequest }}} **
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//
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// This method returns a new IO Channel for requests to be made
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// through. It is never called directly, only {{{_doRequest}}} uses it
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// to obtain a request channel.
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//
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_createRequest: function Res__createRequest() {
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let channel = Svc.IO.newChannel(this.spec, null, null).
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QueryInterface(Ci.nsIRequest).QueryInterface(Ci.nsIHttpChannel);
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// Always validate the cache:
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channel.loadFlags |= Ci.nsIRequest.LOAD_BYPASS_CACHE;
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channel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
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// Setup a callback to handle bad HTTPS certificates.
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channel.notificationCallbacks = new BadCertListener();
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// Avoid calling the authorizer more than once
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let headers = this.headers;
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for (let key in headers) {
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if (key == 'Authorization')
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this._log.trace("HTTP Header " + key + ": ***** (suppressed)");
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else
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this._log.trace("HTTP Header " + key + ": " + headers[key]);
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channel.setRequestHeader(key, headers[key], false);
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}
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return channel;
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},
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_onProgress: function Res__onProgress(channel) {},
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_doRequest: function _doRequest(action, data, callback) {
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this._callback = callback;
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let channel = this._channel = this._createRequest();
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if ("undefined" != typeof(data))
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this._data = data;
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// PUT and POST are trreated differently because
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// they have payload data.
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if ("PUT" == action || "POST" == action) {
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// Convert non-string bodies into JSON
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if (this._data.constructor.toString() != String)
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this._data = JSON.stringify(this._data);
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this._log.debug(action + " Length: " + this._data.length);
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this._log.trace(action + " Body: " + this._data);
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let type = ('content-type' in this._headers) ?
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this._headers['content-type'] : 'text/plain';
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let stream = Cc["@mozilla.org/io/string-input-stream;1"].
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createInstance(Ci.nsIStringInputStream);
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stream.setData(this._data, this._data.length);
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channel.QueryInterface(Ci.nsIUploadChannel);
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channel.setUploadStream(stream, type, this._data.length);
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}
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// Setup a channel listener so that the actual network operation
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// is performed asynchronously.
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let listener = new ChannelListener(this._onComplete, this._onProgress,
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this._log);
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channel.requestMethod = action;
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channel.asyncOpen(listener, null);
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},
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_onComplete: function _onComplete(error, data) {
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if (error) {
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this._callback(error);
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return;
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}
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this._data = data;
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let channel = this._channel;
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let action = channel.requestMethod;
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// Set some default values in-case there's no response header
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let headers = {};
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let status = 0;
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let success = true;
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try {
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// Read out the response headers if available
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channel.visitResponseHeaders({
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visitHeader: function visitHeader(header, value) {
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headers[header.toLowerCase()] = value;
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}
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});
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status = channel.responseStatus;
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success = channel.requestSucceeded;
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// Log the status of the request
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let mesg = [action, success ? "success" : "fail", status,
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channel.URI.spec].join(" ");
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if (mesg.length > 200)
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mesg = mesg.substr(0, 200) + "…";
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this._log.debug(mesg);
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// Additionally give the full response body when Trace logging
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if (this._log.level <= Log4Moz.Level.Trace)
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this._log.trace(action + " body: " + data);
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// This is a server-side safety valve to allow slowing down
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// clients without hurting performance.
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if (headers["x-weave-backoff"])
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Observers.notify("weave:service:backoff:interval",
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parseInt(headers["x-weave-backoff"], 10));
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if (success && headers["x-weave-quota-remaining"])
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Observers.notify("weave:service:quota:remaining",
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parseInt(headers["x-weave-quota-remaining"], 10));
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}
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// Got a response but no header; must be cached (use default values)
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catch(ex) {
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this._log.debug(action + " cached: " + status);
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}
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let ret = new String(data);
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ret.headers = headers;
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ret.status = status;
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ret.success = success;
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// Make a lazy getter to convert the json response into an object
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Utils.lazy2(ret, "obj", function() JSON.parse(ret));
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// Notify if we get a 401 to maybe try again with a new uri
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if (status == 401) {
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// Create an object to allow observers to decide if we should try again
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let subject = {
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newUri: "",
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resource: this,
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response: ret
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}
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Observers.notify("weave:resource:status:401", subject);
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// Do the same type of request but with the new uri
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if (subject.newUri != "") {
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this.uri = subject.newUri;
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this._doRequest(action, this._data, this._callback);
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return;
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}
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}
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this._callback(null, ret);
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},
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get: function get(callback) {
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this._doRequest("GET", undefined, callback);
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},
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put: function put(data, callback) {
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if (typeof data == "function")
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[data, callback] = [undefined, data];
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this._doRequest("PUT", data, callback);
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},
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post: function post(data, callback) {
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if (typeof data == "function")
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[data, callback] = [undefined, data];
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this._doRequest("POST", data, callback);
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},
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delete: function delete(callback) {
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this._doRequest("DELETE", undefined, callback);
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}
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};
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/*
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* Represent a remote network resource, identified by a URI, with a
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* synchronous API.
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*
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* 'Resource' is not recommended for new code. Use the asynchronous API of
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* 'AsyncResource' instead.
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*/
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function Resource(uri) {
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AsyncResource.call(this, uri);
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}
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Resource.prototype = {
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__proto__: AsyncResource.prototype,
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// ** {{{ Resource.serverTime }}} **
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//
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// Caches the latest server timestamp (X-Weave-Timestamp header).
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serverTime: null,
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// ** {{{ Resource._request }}} **
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//
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// Perform a particular HTTP request on the resource. This method
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// is never called directly, but is used by the high-level
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// {{{get}}}, {{{put}}}, {{{post}}} and {{delete}} methods.
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_request: function Res__request(action, data) {
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let [doRequest, cb] = Sync.withCb(this._doRequest, this);
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function callback(error, ret) {
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if (error)
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cb.throw(error);
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cb(ret);
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}
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// The channel listener might get a failure code
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try {
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return doRequest(action, data, callback);
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} catch(ex) {
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// Combine the channel stack with this request stack
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let error = Error(ex.message);
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let chanStack = [];
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if (ex.stack)
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chanStack = ex.stack.trim().split(/\n/).slice(1);
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let requestStack = error.stack.split(/\n/).slice(1);
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// Strip out the args for the last 2 frames because they're usually HUGE!
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for (let i = 0; i <= 1; i++)
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requestStack[i] = requestStack[i].replace(/\(".*"\)@/, "(...)@");
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error.stack = chanStack.concat(requestStack).join("\n");
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throw error;
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}
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},
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// ** {{{ Resource.get }}} **
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//
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// Perform an asynchronous HTTP GET for this resource.
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get: function Res_get() {
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return this._request("GET");
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},
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// ** {{{ Resource.put }}} **
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//
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// Perform a HTTP PUT for this resource.
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put: function Res_put(data) {
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return this._request("PUT", data);
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},
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// ** {{{ Resource.post }}} **
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//
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// Perform a HTTP POST for this resource.
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post: function Res_post(data) {
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return this._request("POST", data);
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},
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// ** {{{ Resource.delete }}} **
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//
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// Perform a HTTP DELETE for this resource.
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delete: function Res_delete() {
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return this._request("DELETE");
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}
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};
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// = ChannelListener =
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//
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// This object implements the {{{nsIStreamListener}}} interface
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// and is called as the network operation proceeds.
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function ChannelListener(onComplete, onProgress, logger) {
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this._onComplete = onComplete;
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this._onProgress = onProgress;
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this._log = logger;
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this.delayAbort();
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}
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ChannelListener.prototype = {
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// Wait 5 minutes before killing a request
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ABORT_TIMEOUT: 300000,
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onStartRequest: function Channel_onStartRequest(channel) {
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channel.QueryInterface(Ci.nsIHttpChannel);
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// Save the latest server timestamp when possible
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try {
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Resource.serverTime = channel.getResponseHeader("X-Weave-Timestamp") - 0;
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}
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catch(ex) {}
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this._log.trace(channel.requestMethod + " " + channel.URI.spec);
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this._data = '';
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this.delayAbort();
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},
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onStopRequest: function Channel_onStopRequest(channel, context, status) {
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// Clear the abort timer now that the channel is done
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this.abortTimer.clear();
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if (this._data == '')
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this._data = null;
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// Throw the failure code name (and stop execution)
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if (!Components.isSuccessCode(status)) {
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this._onComplete(Error(Components.Exception("", status).name));
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return;
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}
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this._onComplete(null, this._data);
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},
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onDataAvailable: function Channel_onDataAvail(req, cb, stream, off, count) {
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let siStream = Cc["@mozilla.org/scriptableinputstream;1"].
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createInstance(Ci.nsIScriptableInputStream);
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siStream.init(stream);
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this._data += siStream.read(count);
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this._onProgress();
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this.delayAbort();
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},
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/**
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* Create or push back the abort timer that kills this request
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*/
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delayAbort: function delayAbort() {
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Utils.delay(this.abortRequest, this.ABORT_TIMEOUT, this, "abortTimer");
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},
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abortRequest: function abortRequest() {
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// Ignore any callbacks if we happen to get any now
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this.onStopRequest = function() {};
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this.onDataAvailable = function() {};
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this._onComplete(Error("Aborting due to channel inactivity."));
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}
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};
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// = BadCertListener =
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//
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// We use this listener to ignore bad HTTPS
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// certificates and continue a request on a network
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// channel. Probably not a very smart thing to do,
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// but greatly simplifies debugging and is just very
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// convenient.
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function BadCertListener() {
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}
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BadCertListener.prototype = {
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getInterface: function(aIID) {
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return this.QueryInterface(aIID);
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},
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QueryInterface: function(aIID) {
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if (aIID.equals(Components.interfaces.nsIBadCertListener2) ||
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aIID.equals(Components.interfaces.nsIInterfaceRequestor) ||
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aIID.equals(Components.interfaces.nsISupports))
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return this;
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throw Components.results.NS_ERROR_NO_INTERFACE;
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},
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notifyCertProblem: function certProblem(socketInfo, sslStatus, targetHost) {
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// Silently ignore?
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let log = Log4Moz.repository.getLogger("Service.CertListener");
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log.level =
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Log4Moz.Level[Utils.prefs.getCharPref("log.logger.network.resources")];
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log.debug("Invalid HTTPS certificate encountered, ignoring!");
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return true;
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}
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};
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