gecko/toolkit/components/url-classifier/content/multi-querier.js

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2007-07-25 20:11:43 -07:00
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (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.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is Google Safe Browsing.
#
# The Initial Developer of the Original Code is Google Inc.
# Portions created by the Initial Developer are Copyright (C) 2006
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
# Tony Chang <tony@google.com> (original author)
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****
/**
* This class helps us batch a series of async calls to the db.
* If any of the tokens is in the database, we fire callback with
* true as a param. If all the tokens are not in the database,
* we fire callback with false as a param.
* This is an "Abstract" base class. Subclasses need to supply
* the condition_ method.
*
* @param tokens Array of strings to lookup in the db
* @param tableName String name of the table
* @param callback Function callback function that takes true if the condition
* passes.
*/
function MultiQuerier(tokens, tableName, callback) {
this.tokens_ = tokens;
this.tableName_ = tableName;
this.callback_ = callback;
this.dbservice_ = Cc["@mozilla.org/url-classifier/dbservice;1"]
.getService(Ci.nsIUrlClassifierDBService);
// We put the current token in this variable.
this.key_ = null;
}
/**
* Run the remaining tokens against the db.
*/
MultiQuerier.prototype.run = function() {
if (this.tokens_.length == 0) {
this.callback_.handleEvent(false);
this.dbservice_ = null;
this.callback_ = null;
return;
}
this.key_ = this.tokens_.pop();
G_Debug(this, "Looking up " + this.key_ + " in " + this.tableName_);
this.dbservice_.exists(this.tableName_, this.key_,
BindToObject(this.result_, this));
}
/**
* Callback from the db. If the returned value passes the this.condition_
* test, go ahead and call the main callback.
*/
MultiQuerier.prototype.result_ = function(value) {
if (this.condition_(value)) {
this.callback_.handleEvent(true)
this.dbservice_ = null;
this.callback_ = null;
} else {
this.run();
}
}
// Subclasses must override this.
MultiQuerier.prototype.condition_ = function(value) {
throw "MultiQuerier is an abstract base class";
}
/**
* Concrete MultiQuerier that stops if the key exists in the db.
*/
function ExistsMultiQuerier(tokens, tableName, callback) {
MultiQuerier.call(this, tokens, tableName, callback);
this.debugZone = "existsMultiQuerier";
}
ExistsMultiQuerier.inherits(MultiQuerier);
ExistsMultiQuerier.prototype.condition_ = function(value) {
return value.length > 0;
}
/**
* Concrete MultiQuerier that looks up a key, decrypts it, then
* checks the the resulting regular expressions for a match.
* @param tokens Array of hosts
*/
function EnchashMultiQuerier(tokens, tableName, callback, url) {
MultiQuerier.call(this, tokens, tableName, callback);
this.url_ = url;
this.enchashDecrypter_ = new PROT_EnchashDecrypter();
this.debugZone = "enchashMultiQuerier";
}
EnchashMultiQuerier.inherits(MultiQuerier);
EnchashMultiQuerier.prototype.run = function() {
if (this.tokens_.length == 0) {
this.callback_.handleEvent(false);
this.dbservice_ = null;
this.callback_ = null;
return;
}
var host = this.tokens_.pop();
this.key_ = host;
var lookupKey = this.enchashDecrypter_.getLookupKey(host);
this.dbservice_.exists(this.tableName_, lookupKey,
BindToObject(this.result_, this));
}
EnchashMultiQuerier.prototype.condition_ = function(encryptedValue) {
if (encryptedValue.length > 0) {
// We have encrypted regular expressions for this host. Let's
// decrypt them and see if we have a match.
var decrypted = this.enchashDecrypter_.decryptData(encryptedValue,
this.key_);
var res = this.enchashDecrypter_.parseRegExps(decrypted);
for (var j = 0; j < res.length; j++) {
if (res[j].test(this.url_)) {
return true;
}
}
}
return false;
}