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Delta Between Two Patch Sets: lib/hitLogger.js

Issue 29705719: Issue 6402 - Split filter hit / request logging out into own API (Closed)
Left Patch Set: Created Feb. 22, 2018, 3:23 p.m.
Right Patch Set: Addressed Manish's feedback Created May 9, 2018, 5:53 p.m.
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1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-present eyeo GmbH
4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation.
8 *
9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 /** @module hitLogger */
19
20 "use strict";
21
22 const {extractHostFromFrame} = require("./url");
23 const {EventEmitter} = require("../adblockpluscore/lib/events");
24 const {FilterStorage} = require("../adblockpluscore/lib/filterStorage");
25 const {port} = require("./messaging");
26 const {RegExpFilter,
27 ElemHideFilter} = require("../adblockpluscore/lib/filterClasses");
28
29 const nonRequestTypes = exports.nonRequestTypes = [
30 "DOCUMENT", "ELEMHIDE", "GENERICBLOCK", "GENERICHIDE", "CSP"
31 ];
32
33 let eventEmitter = new EventEmitter();
34
35 /**
36 * @namespace
37 * @static
38 */
39 let HitLogger = exports.HitLogger = {
40 /**
41 * Adds a listener for requests, filter hits etc related to the tab.
42 *
43 * Note: Calling code is responsible for removing the listener again,
44 * it will not be automatically removed when the tab is closed.
45 *
46 * @param {number} tabId
47 * @param {function} listener
48 */
49 addListener: eventEmitter.on.bind(eventEmitter),
50
51 /**
52 * Removes a listener for the tab.
53 *
54 * @param {number} tabId
55 * @param {function} listener
56 */
57 removeListener: eventEmitter.off.bind(eventEmitter),
58
59 /**
60 * Checks whether a tab is being inspected by anything.
61 *
62 * @param {number} tabId
63 * @return {boolean}
64 */
65 hasListener(tabId)
66 {
67 let listeners = eventEmitter._listeners.get(tabId);
68 return listeners && listeners.length > 0;
69 }
70 };
71
72 /**
73 * Logs a request associated with a tab or multiple tabs.
74 *
75 * @param {number[]} tabIds
76 * The tabIds associated with the request
77 * @param {Object} request
78 * The request to log
79 * @param {string} request.url
80 * The URL of the request
81 * @param {string} request.type
82 * The request type
83 * @param {string} request.docDomain
84 * The hostname of the document
85 * @param {boolean} request.thirdParty
86 * Whether the origin of the request and document differs
87 * @param {?string} request.sitekey
88 * The active sitekey if there is any
89 * @param {?boolean} request.specificOnly
90 * Whether generic filters should be ignored
91 * @param {?BlockingFilter} filter
92 * The matched filter or null if there is no match
93 */
94 exports.logRequest = (tabIds, request, filter) =>
95 {
96 for (let tabId of tabIds)
97 eventEmitter.emit(tabId, request, filter);
98 };
99
100 /**
101 * Logs active element hiding filters for a tab.
102 *
103 * @param {number} tabId The ID of the tab, the elements were hidden in
104 * @param {string[]} selectors The selectors of applied ElemHideFilters
105 * @param {string[]} filters The text of applied ElemHideEmulationFilters
106 * @param {string} docDomain The hostname of the document
107 */
108 function logHiddenElements(tabId, selectors, filters, docDomain)
109 {
110 if (HitLogger.hasListener(tabId))
111 {
112 for (let subscription of FilterStorage.subscriptions)
113 {
114 if (subscription.disabled)
115 continue;
116
117 for (let filter of subscription.filters)
118 {
119 // We only know the exact filter in case of element hiding emulation.
120 // For regular element hiding filters, the content script only knows
121 // the selector, so we have to find a filter that has an identical
122 // selector and is active on the domain the match was reported from.
123 let isActiveElemHideFilter = filter instanceof ElemHideFilter &&
124 selectors.includes(filter.selector) &&
125 filter.isActiveOnDomain(docDomain);
126
127 if (isActiveElemHideFilter || filters.includes(filter.text))
128 eventEmitter.emit(tabId, {type: "ELEMHIDE", docDomain}, filter);
129 }
130 }
131 }
132 }
133
134 /**
135 * Logs a whitelisting filter that disables (some kind of)
136 * blocking for a particular document.
137 *
138 * @param {number} tabId The tabId the whitelisting is active for
139 * @param {string} url The url of the whitelisted document
140 * @param {number} typeMask The bit mask of whitelisting types checked
141 * for
142 * @param {string} docDomain The hostname of the parent document
143 * @param {WhitelistFilter} filter The matched whitelisting filter
144 */
145 exports.logWhitelistedDocument = (tabId, url, typeMask, docDomain, filter) =>
146 {
147 if (HitLogger.hasListener(tabId))
148 {
149 for (let type of nonRequestTypes)
150 {
151 if (typeMask & filter.contentType & RegExpFilter.typeMap[type])
152 eventEmitter.emit(tabId, {url, type, docDomain}, filter);
153 }
154 }
155 };
156
157 port.on("hitLogger.traceElemHide", (message, sender) =>
158 {
159 logHiddenElements(
160 sender.page.id, message.selectors, message.filters,
161 extractHostFromFrame(sender.frame)
162 );
163 });
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