The Tor Browser / file comparison
comparison: toolkit/components/url-classifier/content/multi-querier.js
toolkit/components/url-classifier/content/multi-querier.js
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| -1:000000000000 | 0:0499d3dc01c3 |
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| 1 # This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 # License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 # file, You can obtain one at http://mozilla.org/MPL/2.0/. | |
| 4 | |
| 5 /** | |
| 6 * This class helps us batch a series of async calls to the db. | |
| 7 * If any of the tokens is in the database, we fire callback with | |
| 8 * true as a param. If all the tokens are not in the database, | |
| 9 * we fire callback with false as a param. | |
| 10 * This is an "Abstract" base class. Subclasses need to supply | |
| 11 * the condition_ method. | |
| 12 * | |
| 13 * @param tokens Array of strings to lookup in the db | |
| 14 * @param tableName String name of the table | |
| 15 * @param callback Function callback function that takes true if the condition | |
| 16 * passes. | |
| 17 */ | |
| 18 function MultiQuerier(tokens, tableName, callback) { | |
| 19 this.tokens_ = tokens; | |
| 20 this.tableName_ = tableName; | |
| 21 this.callback_ = callback; | |
| 22 this.dbservice_ = Cc["@mozilla.org/url-classifier/dbservice;1"] | |
| 23 .getService(Ci.nsIUrlClassifierDBService); | |
| 24 // We put the current token in this variable. | |
| 25 this.key_ = null; | |
| 26 } | |
| 27 | |
| 28 /** | |
| 29 * Run the remaining tokens against the db. | |
| 30 */ | |
| 31 MultiQuerier.prototype.run = function() { | |
| 32 if (this.tokens_.length == 0) { | |
| 33 this.callback_.handleEvent(false); | |
| 34 this.dbservice_ = null; | |
| 35 this.callback_ = null; | |
| 36 return; | |
| 37 } | |
| 38 | |
| 39 this.key_ = this.tokens_.pop(); | |
| 40 G_Debug(this, "Looking up " + this.key_ + " in " + this.tableName_); | |
| 41 this.dbservice_.exists(this.tableName_, this.key_, | |
| 42 BindToObject(this.result_, this)); | |
| 43 } | |
| 44 | |
| 45 /** | |
| 46 * Callback from the db. If the returned value passes the this.condition_ | |
| 47 * test, go ahead and call the main callback. | |
| 48 */ | |
| 49 MultiQuerier.prototype.result_ = function(value) { | |
| 50 if (this.condition_(value)) { | |
| 51 this.callback_.handleEvent(true) | |
| 52 this.dbservice_ = null; | |
| 53 this.callback_ = null; | |
| 54 } else { | |
| 55 this.run(); | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 // Subclasses must override this. | |
| 60 MultiQuerier.prototype.condition_ = function(value) { | |
| 61 throw "MultiQuerier is an abstract base class"; | |
| 62 } | |
| 63 | |
| 64 | |
| 65 /** | |
| 66 * Concrete MultiQuerier that stops if the key exists in the db. | |
| 67 */ | |
| 68 function ExistsMultiQuerier(tokens, tableName, callback) { | |
| 69 MultiQuerier.call(this, tokens, tableName, callback); | |
| 70 this.debugZone = "existsMultiQuerier"; | |
| 71 } | |
| 72 ExistsMultiQuerier.inherits(MultiQuerier); | |
| 73 | |
| 74 ExistsMultiQuerier.prototype.condition_ = function(value) { | |
| 75 return value.length > 0; | |
| 76 } | |
| 77 | |
| 78 | |
| 79 /** | |
| 80 * Concrete MultiQuerier that looks up a key, decrypts it, then | |
| 81 * checks the the resulting regular expressions for a match. | |
| 82 * @param tokens Array of hosts | |
| 83 */ | |
| 84 function EnchashMultiQuerier(tokens, tableName, callback, url) { | |
| 85 MultiQuerier.call(this, tokens, tableName, callback); | |
| 86 this.url_ = url; | |
| 87 this.enchashDecrypter_ = new PROT_EnchashDecrypter(); | |
| 88 this.debugZone = "enchashMultiQuerier"; | |
| 89 } | |
| 90 EnchashMultiQuerier.inherits(MultiQuerier); | |
| 91 | |
| 92 EnchashMultiQuerier.prototype.run = function() { | |
| 93 if (this.tokens_.length == 0) { | |
| 94 this.callback_.handleEvent(false); | |
| 95 this.dbservice_ = null; | |
| 96 this.callback_ = null; | |
| 97 return; | |
| 98 } | |
| 99 var host = this.tokens_.pop(); | |
| 100 this.key_ = host; | |
| 101 var lookupKey = this.enchashDecrypter_.getLookupKey(host); | |
| 102 this.dbservice_.exists(this.tableName_, lookupKey, | |
| 103 BindToObject(this.result_, this)); | |
| 104 } | |
| 105 | |
| 106 EnchashMultiQuerier.prototype.condition_ = function(encryptedValue) { | |
| 107 if (encryptedValue.length > 0) { | |
| 108 // We have encrypted regular expressions for this host. Let's | |
| 109 // decrypt them and see if we have a match. | |
| 110 var decrypted = this.enchashDecrypter_.decryptData(encryptedValue, | |
| 111 this.key_); | |
| 112 var res = this.enchashDecrypter_.parseRegExps(decrypted); | |
| 113 for (var j = 0; j < res.length; j++) { | |
| 114 if (res[j].test(this.url_)) { | |
| 115 return true; | |
| 116 } | |
| 117 } | |
| 118 } | |
| 119 return false; | |
| 120 } |
