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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
/**
* 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.
*/
this.MultiQuerier =
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.
*/
this.ExistsMultiQuerier =
function ExistsMultiQuerier(tokens, tableName, callback) {
MultiQuerier.call(this, tokens, tableName, callback);
this.debugZone = "existsMultiQuerier";
}
ExistsMultiQuerier.inherits = function(parentCtor) {
var tempCtor = function(){};
tempCtor.prototype = parentCtor.prototype;
this.superClass_ = parentCtor.prototype;
this.prototype = new tempCtor();
}
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
*/
this.EnchashMultiQuerier =
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 = function(parentCtor) {
var tempCtor = function(){};
tempCtor.prototype = parentCtor.prototype;
this.superClass_ = parentCtor.prototype;
this.prototype = new tempCtor();
}
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;
}
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