зеркало из https://github.com/mozilla/pjs.git
760 строки
24 KiB
JavaScript
760 строки
24 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 Google Suggest Autocomplete Implementation for Firefox.
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*
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* The Initial Developer of the Original Code is Google Inc.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Ben Goodger <beng@google.com>
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* Mike Connor <mconnor@mozilla.com>
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* Joe Hughes <joe@retrovirus.com>
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* Pamela Greene <pamg.bugs@gmail.com>
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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 SEARCH_RESPONSE_SUGGESTION_JSON = "application/x-suggestions+json";
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const BROWSER_SUGGEST_PREF = "browser.search.suggest.enabled";
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const XPCOM_SHUTDOWN_TOPIC = "xpcom-shutdown";
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const NS_PREFBRANCH_PREFCHANGE_TOPIC_ID = "nsPref:changed";
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const SEARCH_BUNDLE = "chrome://global/locale/search/search.properties";
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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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const HTTP_OK = 200;
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const HTTP_INTERNAL_SERVER_ERROR = 500;
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const HTTP_BAD_GATEWAY = 502;
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const HTTP_SERVICE_UNAVAILABLE = 503;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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/**
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* SuggestAutoCompleteResult contains the results returned by the Suggest
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* service - it implements nsIAutoCompleteResult and is used by the auto-
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* complete controller to populate the front end.
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* @constructor
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*/
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function SuggestAutoCompleteResult(searchString,
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searchResult,
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defaultIndex,
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errorDescription,
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results,
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comments,
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formHistoryResult) {
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this._searchString = searchString;
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this._searchResult = searchResult;
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this._defaultIndex = defaultIndex;
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this._errorDescription = errorDescription;
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this._results = results;
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this._comments = comments;
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this._formHistoryResult = formHistoryResult;
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}
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SuggestAutoCompleteResult.prototype = {
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/**
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* The user's query string
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* @private
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*/
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_searchString: "",
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/**
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* The result code of this result object, see |get searchResult| for possible
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* values.
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* @private
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*/
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_searchResult: 0,
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/**
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* The default item that should be entered if none is selected
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* @private
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*/
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_defaultIndex: 0,
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/**
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* The reason the search failed
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* @private
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*/
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_errorDescription: "",
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/**
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* The list of words returned by the Suggest Service
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* @private
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*/
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_results: [],
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/**
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* The list of Comments (number of results - or page titles) returned by the
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* Suggest Service.
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* @private
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*/
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_comments: [],
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/**
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* A reference to the form history nsIAutocompleteResult that we're wrapping.
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* We use this to forward removeEntryAt calls as needed.
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*/
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_formHistoryResult: null,
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/**
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* @return the user's query string
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*/
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get searchString() {
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return this._searchString;
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},
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/**
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* @return the result code of this result object, either:
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* RESULT_IGNORED (invalid searchString)
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* RESULT_FAILURE (failure)
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* RESULT_NOMATCH (no matches found)
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* RESULT_SUCCESS (matches found)
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*/
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get searchResult() {
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return this._searchResult;
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},
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/**
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* @return the default item that should be entered if none is selected
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*/
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get defaultIndex() {
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return this._defaultIndex;
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},
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/**
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* @return the reason the search failed
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*/
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get errorDescription() {
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return this._errorDescription;
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},
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/**
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* @return the number of results
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*/
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get matchCount() {
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return this._results.length;
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},
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/**
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* Retrieves a result
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* @param index the index of the result requested
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* @return the result at the specified index
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*/
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getValueAt: function(index) {
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return this._results[index];
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},
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/**
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* Retrieves a comment (metadata instance)
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* @param index the index of the comment requested
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* @return the comment at the specified index
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*/
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getCommentAt: function(index) {
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return this._comments[index];
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},
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/**
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* Retrieves a style hint specific to a particular index.
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* @param index the index of the style hint requested
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* @return the style hint at the specified index
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*/
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getStyleAt: function(index) {
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if (!this._comments[index])
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return null; // not a category label, so no special styling
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if (index == 0)
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return "suggestfirst"; // category label on first line of results
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return "suggesthint"; // category label on any other line of results
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},
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/**
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* Retrieves an image url.
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* @param index the index of the image url requested
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* @return the image url at the specified index
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*/
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getImageAt: function(index) {
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return "";
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},
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/**
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* Removes a result from the resultset
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* @param index the index of the result to remove
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*/
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removeValueAt: function(index, removeFromDatabase) {
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// Forward the removeValueAt call to the underlying result if we have one
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// Note: this assumes that the form history results were added to the top
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// of our arrays.
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if (removeFromDatabase && this._formHistoryResult &&
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index < this._formHistoryResult.matchCount) {
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// Delete the history result from the DB
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this._formHistoryResult.removeValueAt(index, true);
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}
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this._results.splice(index, 1);
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this._comments.splice(index, 1);
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},
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// nsISupports
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIAutoCompleteResult])
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};
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/**
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* SuggestAutoComplete is a base class that implements nsIAutoCompleteSearch
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* and can collect results for a given search by using the search URL supplied
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* by the subclass. We do it this way since the AutoCompleteController in
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* Mozilla requires a unique XPCOM Service for every search provider, even if
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* the logic for two providers is identical.
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* @constructor
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*/
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function SuggestAutoComplete() {
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this._init();
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}
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SuggestAutoComplete.prototype = {
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_init: function() {
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this._addObservers();
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this._loadSuggestPref();
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},
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/**
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* this._strings is the string bundle for message internationalization.
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*/
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get _strings() {
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if (!this.__strings) {
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var sbs = Cc["@mozilla.org/intl/stringbundle;1"].
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getService(Ci.nsIStringBundleService);
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this.__strings = sbs.createBundle(SEARCH_BUNDLE);
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}
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return this.__strings;
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},
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__strings: null,
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/**
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* Search suggestions will be shown if this._suggestEnabled is true.
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*/
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_loadSuggestPref: function SAC_loadSuggestPref() {
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var prefService = Cc["@mozilla.org/preferences-service;1"].
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getService(Ci.nsIPrefBranch);
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this._suggestEnabled = prefService.getBoolPref(BROWSER_SUGGEST_PREF);
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},
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_suggestEnabled: null,
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/*************************************************************************
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* Server request backoff implementation fields below
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* These allow us to throttle requests if the server is getting hammered.
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**************************************************************************/
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/**
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* This is an array that contains the timestamps (in unixtime) of
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* the last few backoff-triggering errors.
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*/
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_serverErrorLog: [],
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/**
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* If we receive this number of backoff errors within the amount of time
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* specified by _serverErrorPeriod, then we initiate backoff.
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*/
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_maxErrorsBeforeBackoff: 3,
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/**
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* If we receive enough consecutive errors (where "enough" is defined by
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* _maxErrorsBeforeBackoff above) within this time period,
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* we trigger the backoff behavior.
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*/
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_serverErrorPeriod: 600000, // 10 minutes in milliseconds
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/**
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* If we get another backoff error immediately after timeout, we increase the
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* backoff to (2 x old period) + this value.
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*/
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_serverErrorTimeoutIncrement: 600000, // 10 minutes in milliseconds
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/**
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* The current amount of time to wait before trying a server request
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* after receiving a backoff error.
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*/
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_serverErrorTimeout: 0,
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/**
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* Time (in unixtime) after which we're allowed to try requesting again.
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*/
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_nextRequestTime: 0,
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/**
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* The last engine we requested against (so that we can tell if the
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* user switched engines).
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*/
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_serverErrorEngine: null,
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/**
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* The XMLHttpRequest object.
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* @private
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*/
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_request: null,
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/**
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* The object implementing nsIAutoCompleteObserver that we notify when
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* we have found results
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* @private
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*/
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_listener: null,
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/**
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* If this is true, we'll integrate form history results with the
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* suggest results.
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*/
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_includeFormHistory: true,
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/**
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* True if a request for remote suggestions was sent. This is used to
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* differentiate between the "_request is null because the request has
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* already returned a result" and "_request is null because no request was
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* sent" cases.
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*/
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_sentSuggestRequest: false,
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/**
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* This is the callback for the suggest timeout timer.
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*/
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notify: function SAC_notify(timer) {
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// FIXME: bug 387341
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// Need to break the cycle between us and the timer.
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this._formHistoryTimer = null;
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// If this._listener is null, we've already sent out suggest results, so
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// nothing left to do here.
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if (!this._listener)
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return;
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// Otherwise, the XMLHTTPRequest for suggest results is taking too long,
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// so send out the form history results and cancel the request.
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this._listener.onSearchResult(this, this._formHistoryResult);
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this._reset();
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},
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/**
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* This determines how long (in ms) we should wait before giving up on
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* the suggestions and just showing local form history results.
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*/
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_suggestionTimeout: 500,
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/**
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* This is the callback for that the form history service uses to
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* send us results.
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*/
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onSearchResult: function SAC_onSearchResult(search, result) {
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this._formHistoryResult = result;
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if (this._request) {
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// We still have a pending request, wait a bit to give it a chance to
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// finish.
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this._formHistoryTimer = Cc["@mozilla.org/timer;1"].
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createInstance(Ci.nsITimer);
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this._formHistoryTimer.initWithCallback(this, this._suggestionTimeout,
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Ci.nsITimer.TYPE_ONE_SHOT);
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} else if (!this._sentSuggestRequest) {
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// We didn't send a request, so just send back the form history results.
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this._listener.onSearchResult(this, this._formHistoryResult);
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this._reset();
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}
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},
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/**
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* This is the URI that the last suggest request was sent to.
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*/
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_suggestURI: null,
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/**
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* Autocomplete results from the form history service get stored here.
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*/
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_formHistoryResult: null,
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/**
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* This holds the suggest server timeout timer, if applicable.
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*/
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_formHistoryTimer: null,
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/**
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* This clears all the per-request state.
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*/
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_reset: function SAC_reset() {
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// Don't let go of our listener and form history result if the timer is
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// still pending, the timer will call _reset() when it fires.
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if (!this._formHistoryTimer) {
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this._listener = null;
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this._formHistoryResult = null;
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}
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this._request = null;
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},
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/**
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* This sends an autocompletion request to the form history service,
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* which will call onSearchResults with the results of the query.
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*/
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_startHistorySearch: function SAC_SHSearch(searchString, searchParam, previousResult) {
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var formHistory =
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Cc["@mozilla.org/autocomplete/search;1?name=form-history"].
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createInstance(Ci.nsIAutoCompleteSearch);
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formHistory.startSearch(searchString, searchParam, previousResult, this);
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},
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/**
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* Makes a note of the fact that we've received a backoff-triggering
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* response, so that we can adjust the backoff behavior appropriately.
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*/
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_noteServerError: function SAC__noteServeError() {
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var currentTime = Date.now();
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this._serverErrorLog.push(currentTime);
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if (this._serverErrorLog.length > this._maxErrorsBeforeBackoff)
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this._serverErrorLog.shift();
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if ((this._serverErrorLog.length == this._maxErrorsBeforeBackoff) &&
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((currentTime - this._serverErrorLog[0]) < this._serverErrorPeriod)) {
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// increase timeout, and then don't request until timeout is over
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this._serverErrorTimeout = (this._serverErrorTimeout * 2) +
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this._serverErrorTimeoutIncrement;
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this._nextRequestTime = currentTime + this._serverErrorTimeout;
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}
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},
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/**
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* Resets the backoff behavior; called when we get a successful response.
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*/
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_clearServerErrors: function SAC__clearServerErrors() {
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this._serverErrorLog = [];
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this._serverErrorTimeout = 0;
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this._nextRequestTime = 0;
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},
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/**
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* This checks whether we should send a server request (i.e. we're not
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* in a error-triggered backoff period.
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*
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* @private
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*/
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_okToRequest: function SAC__okToRequest() {
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return Date.now() > this._nextRequestTime;
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},
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/**
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* This checks to see if the new search engine is different
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* from the previous one, and if so clears any error state that might
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* have accumulated for the old engine.
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*
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* @param engine The engine that the suggestion request would be sent to.
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* @private
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*/
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_checkForEngineSwitch: function SAC__checkForEngineSwitch(engine) {
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if (engine == this._serverErrorEngine)
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return;
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// must've switched search providers, clear old errors
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this._serverErrorEngine = engine;
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this._clearServerErrors();
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},
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/**
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* This returns true if the status code of the HTTP response
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* represents a backoff-triggering error.
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*
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* @param status The status code from the HTTP response
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* @private
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*/
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_isBackoffError: function SAC__isBackoffError(status) {
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return ((status == HTTP_INTERNAL_SERVER_ERROR) ||
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(status == HTTP_BAD_GATEWAY) ||
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(status == HTTP_SERVICE_UNAVAILABLE));
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},
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/**
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* Called when the 'readyState' of the XMLHttpRequest changes. We only care
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* about state 4 (COMPLETED) - handle the response data.
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* @private
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*/
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onReadyStateChange: function() {
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// xxx use the real const here
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if (!this._request || this._request.readyState != 4)
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return;
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try {
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var status = this._request.status;
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} catch (e) {
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// The XML HttpRequest can throw NS_ERROR_NOT_AVAILABLE.
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return;
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}
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if (this._isBackoffError(status)) {
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this._noteServerError();
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return;
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}
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var responseText = this._request.responseText;
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if (status != HTTP_OK || responseText == "")
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return;
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this._clearServerErrors();
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var serverResults = JSON.parse(responseText);
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var searchString = serverResults[0] || "";
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var results = serverResults[1] || [];
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var comments = []; // "comments" column values for suggestions
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var historyResults = [];
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var historyComments = [];
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// If form history is enabled and has results, add them to the list.
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if (this._includeFormHistory && this._formHistoryResult &&
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(this._formHistoryResult.searchResult ==
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Ci.nsIAutoCompleteResult.RESULT_SUCCESS)) {
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for (var i = 0; i < this._formHistoryResult.matchCount; ++i) {
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var term = this._formHistoryResult.getValueAt(i);
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// we don't want things to appear in both history and suggestions
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var dupIndex = results.indexOf(term);
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if (dupIndex != -1)
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results.splice(dupIndex, 1);
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historyResults.push(term);
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historyComments.push("");
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}
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}
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// fill out the comment column for the suggestions
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for (var i = 0; i < results.length; ++i)
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comments.push("");
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// if we have any suggestions, put a label at the top
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if (comments.length > 0)
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comments[0] = this._strings.GetStringFromName("suggestion_label");
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// now put the history results above the suggestions
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var finalResults = historyResults.concat(results);
|
|
var finalComments = historyComments.concat(comments);
|
|
|
|
// Notify the FE of our new results
|
|
this.onResultsReady(searchString, finalResults, finalComments,
|
|
this._formHistoryResult);
|
|
|
|
// Reset our state for next time.
|
|
this._reset();
|
|
},
|
|
|
|
/**
|
|
* Notifies the front end of new results.
|
|
* @param searchString the user's query string
|
|
* @param results an array of results to the search
|
|
* @param comments an array of metadata corresponding to the results
|
|
* @private
|
|
*/
|
|
onResultsReady: function(searchString, results, comments,
|
|
formHistoryResult) {
|
|
if (this._listener) {
|
|
var result = new SuggestAutoCompleteResult(
|
|
searchString,
|
|
Ci.nsIAutoCompleteResult.RESULT_SUCCESS,
|
|
0,
|
|
"",
|
|
results,
|
|
comments,
|
|
formHistoryResult);
|
|
|
|
this._listener.onSearchResult(this, result);
|
|
|
|
// Null out listener to make sure we don't notify it twice, in case our
|
|
// timer callback still hasn't run.
|
|
this._listener = null;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Initiates the search result gathering process. Part of
|
|
* nsIAutoCompleteSearch implementation.
|
|
*
|
|
* @param searchString the user's query string
|
|
* @param searchParam unused, "an extra parameter"; even though
|
|
* this parameter and the next are unused, pass
|
|
* them through in case the form history
|
|
* service wants them
|
|
* @param previousResult unused, a client-cached store of the previous
|
|
* generated resultset for faster searching.
|
|
* @param listener object implementing nsIAutoCompleteObserver which
|
|
* we notify when results are ready.
|
|
*/
|
|
startSearch: function(searchString, searchParam, previousResult, listener) {
|
|
var searchService = Cc["@mozilla.org/browser/search-service;1"].
|
|
getService(Ci.nsIBrowserSearchService);
|
|
|
|
// If there's an existing request, stop it. There is no smart filtering
|
|
// here as there is when looking through history/form data because the
|
|
// result set returned by the server is different for every typed value -
|
|
// "ocean breathes" does not return a subset of the results returned for
|
|
// "ocean", for example. This does nothing if there is no current request.
|
|
this.stopSearch();
|
|
|
|
this._listener = listener;
|
|
|
|
var engine = searchService.currentEngine;
|
|
|
|
this._checkForEngineSwitch(engine);
|
|
|
|
if (!searchString ||
|
|
!this._suggestEnabled ||
|
|
!engine.supportsResponseType(SEARCH_RESPONSE_SUGGESTION_JSON) ||
|
|
!this._okToRequest()) {
|
|
// We have an empty search string (user pressed down arrow to see
|
|
// history), or search suggestions are disabled, or the current engine
|
|
// has no suggest functionality, or we're in backoff mode; so just use
|
|
// local history.
|
|
this._sentSuggestRequest = false;
|
|
this._startHistorySearch(searchString, searchParam, previousResult);
|
|
return;
|
|
}
|
|
|
|
// Actually do the search
|
|
this._request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].
|
|
createInstance(Ci.nsIXMLHttpRequest);
|
|
var submission = engine.getSubmission(searchString,
|
|
SEARCH_RESPONSE_SUGGESTION_JSON);
|
|
this._suggestURI = submission.uri;
|
|
var method = (submission.postData ? "POST" : "GET");
|
|
this._request.open(method, this._suggestURI.spec, true);
|
|
this._request.channel.notificationCallbacks = new SearchSuggestLoadListener();
|
|
|
|
var self = this;
|
|
function onReadyStateChange() {
|
|
self.onReadyStateChange();
|
|
}
|
|
this._request.onreadystatechange = onReadyStateChange;
|
|
this._request.send(submission.postData);
|
|
|
|
if (this._includeFormHistory) {
|
|
this._sentSuggestRequest = true;
|
|
this._startHistorySearch(searchString, searchParam, previousResult);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Ends the search result gathering process. Part of nsIAutoCompleteSearch
|
|
* implementation.
|
|
*/
|
|
stopSearch: function() {
|
|
if (this._request) {
|
|
this._request.abort();
|
|
this._reset();
|
|
}
|
|
},
|
|
|
|
/**
|
|
* nsIObserver
|
|
*/
|
|
observe: function SAC_observe(aSubject, aTopic, aData) {
|
|
switch (aTopic) {
|
|
case NS_PREFBRANCH_PREFCHANGE_TOPIC_ID:
|
|
this._loadSuggestPref();
|
|
break;
|
|
case XPCOM_SHUTDOWN_TOPIC:
|
|
this._removeObservers();
|
|
break;
|
|
}
|
|
},
|
|
|
|
_addObservers: function SAC_addObservers() {
|
|
var prefService2 = Cc["@mozilla.org/preferences-service;1"].
|
|
getService(Ci.nsIPrefBranch2);
|
|
prefService2.addObserver(BROWSER_SUGGEST_PREF, this, false);
|
|
|
|
var os = Cc["@mozilla.org/observer-service;1"].
|
|
getService(Ci.nsIObserverService);
|
|
os.addObserver(this, XPCOM_SHUTDOWN_TOPIC, false);
|
|
},
|
|
|
|
_removeObservers: function SAC_removeObservers() {
|
|
var prefService2 = Cc["@mozilla.org/preferences-service;1"].
|
|
getService(Ci.nsIPrefBranch2);
|
|
prefService2.removeObserver(BROWSER_SUGGEST_PREF, this);
|
|
|
|
var os = Cc["@mozilla.org/observer-service;1"].
|
|
getService(Ci.nsIObserverService);
|
|
os.removeObserver(this, XPCOM_SHUTDOWN_TOPIC);
|
|
},
|
|
|
|
// nsISupports
|
|
QueryInterface: XPCOMUtils.generateQI([Ci.nsIAutoCompleteSearch,
|
|
Ci.nsIAutoCompleteObserver])
|
|
};
|
|
|
|
function SearchSuggestLoadListener() {
|
|
}
|
|
SearchSuggestLoadListener.prototype = {
|
|
// nsIBadCertListener2
|
|
notifyCertProblem: function SSLL_certProblem(socketInfo, status, targetSite) {
|
|
return true;
|
|
},
|
|
|
|
// nsISSLErrorListener
|
|
notifySSLError: function SSLL_SSLError(socketInfo, error, targetSite) {
|
|
return true;
|
|
},
|
|
|
|
// nsIInterfaceRequestor
|
|
getInterface: function SSLL_getInterface(iid) {
|
|
return this.QueryInterface(iid);
|
|
},
|
|
|
|
// nsISupports
|
|
QueryInterface: XPCOMUtils.generateQI([Ci.nsIBadCertListener2,
|
|
Ci.nsISSLErrorListener,
|
|
Ci.nsIInterfaceRequestor])
|
|
};
|
|
|
|
/**
|
|
* SearchSuggestAutoComplete is a service implementation that handles suggest
|
|
* results specific to web searches.
|
|
* @constructor
|
|
*/
|
|
function SearchSuggestAutoComplete() {
|
|
// This calls _init() in the parent class (SuggestAutoComplete) via the
|
|
// prototype, below.
|
|
this._init();
|
|
}
|
|
SearchSuggestAutoComplete.prototype = {
|
|
classDescription: "Remote Search Suggestions",
|
|
contractID: "@mozilla.org/autocomplete/search;1?name=search-autocomplete",
|
|
classID: Components.ID("{aa892eb4-ffbf-477d-9f9a-06c995ae9f27}"),
|
|
__proto__: SuggestAutoComplete.prototype,
|
|
serviceURL: ""
|
|
};
|
|
|
|
var component = [SearchSuggestAutoComplete];
|
|
function NSGetModule(compMgr, fileSpec) {
|
|
return XPCOMUtils.generateModule(component);
|
|
}
|