uBlock/src/js/contentscript.js

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JavaScript
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2014-06-23 16:42:43 -06:00
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
Copyright (C) 2014-2017 Raymond Hill
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
/* global createSet */
'use strict';
/*******************************************************************************
+--> [[domSurveyor] --> domFilterer]
domWatcher--|
+--> [domCollapser]
domWatcher:
Watches for changes in the DOM, and notify the other components about these
changes.
domCollapser:
Enforces the collapsing of DOM elements for which a corresponding
resource was blocked through network filtering.
domFilterer:
Enforces the filtering of DOM elements, by feeding it cosmetic filters.
domSurveyor:
Surveys the DOM to find new cosmetic filters to apply to the current page.
If page is whitelisted:
- domWatcher: off
- domCollapser: off
- domFilterer: off
- domSurveyor: off
I verified that the code in this file is completely flushed out of memory
when a page is whitelisted.
If cosmetic filtering is disabled:
- domWatcher: on
- domCollapser: on
- domFilterer: off
- domSurveyor: off
If generic cosmetic filtering is disabled:
- domWatcher: on
- domCollapser: on
- domFilterer: on
- domSurveyor: off
Additionally, the domSurveyor can turn itself off once it decides that
it has become pointless (repeatedly not finding new cosmetic filters).
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The domFilterer makes use of platform-dependent user styles[1] code, or
provide a default generic implementation if none is present.
At time of writing, only modern Firefox provides a custom implementation,
which makes for solid, reliable and low overhead cosmetic filtering on
Firefox.
The generic implementation[2] performs as best as can be, but won't ever be
as reliable as real user styles.
[1] "user styles" refer to local CSS rules which have priority over, and
can't be overriden by a web page's own CSS rules.
[2] below, see platformUserCSS / platformHideNode / platformUnhideNode
*/
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/******************************************************************************/
/******************************************************************************/
/******************************************************************************/
// Abort execution by throwing if an unexpected condition arise.
// - https://github.com/chrisaljoudi/uBlock/issues/456
if ( typeof vAPI !== 'object' ) {
throw new Error('uBlock Origin: aborting content scripts for ' + window.location);
}
vAPI.lock();
vAPI.matchesProp = (function() {
var docElem = document.documentElement;
if ( typeof docElem.matches !== 'function' ) {
if ( typeof docElem.mozMatchesSelector === 'function' ) {
return 'mozMatchesSelector';
} else if ( typeof docElem.webkitMatchesSelector === 'function' ) {
return 'webkitMatchesSelector';
}
}
return 'matches';
})();
/******************************************************************************/
/******************************************************************************/
/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/2147
vAPI.SafeAnimationFrame = function(callback) {
this.fid = this.tid = null;
this.callback = callback;
};
vAPI.SafeAnimationFrame.prototype.start = function() {
if ( this.fid !== null ) { return; }
this.fid = requestAnimationFrame(this.callback);
this.tid = vAPI.setTimeout(this.callback, 1200000);
};
vAPI.SafeAnimationFrame.prototype.clear = function() {
if ( this.fid === null ) { return; }
cancelAnimationFrame(this.fid);
clearTimeout(this.tid);
this.fid = this.tid = null;
};
/******************************************************************************/
/******************************************************************************/
/******************************************************************************/
// The DOM filterer is the heart of uBO's cosmetic filtering.
vAPI.domFilterer = (function() {
/******************************************************************************/
var allExceptions = createSet(),
allSelectors = createSet(),
stagedNodes = [];
// Complex selectors, due to their nature may need to be "de-committed". A
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// Set() is used to implement this functionality.
var complexSelectorsOldResultSet,
complexSelectorsCurrentResultSet = createSet('object');
/******************************************************************************/
var cosmeticFiltersActivatedTimer = null;
var cosmeticFiltersActivated = function() {
cosmeticFiltersActivatedTimer = null;
vAPI.messaging.send(
'contentscript',
{ what: 'cosmeticFiltersActivated' }
);
};
/******************************************************************************/
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// If a platform does not support its own vAPI.userCSS (user styles), we
// provide a default (imperfect) implementation.
// Probably no longer need to watch for style tags removal/tampering with fix
// to https://github.com/gorhill/uBlock/issues/963
var platformUserCSS = (function() {
if ( vAPI.userCSS instanceof Object ) {
return vAPI.userCSS;
}
return {
enabled: true,
styles: [],
add: function(css) {
var style = document.createElement('style');
style.setAttribute('type', 'text/css');
style.textContent = css;
if ( document.head ) {
document.head.appendChild(style);
}
this.styles.push(style);
if ( style.sheet ) {
style.sheet.disabled = !this.enabled;
}
},
remove: function(css) {
var i = this.styles.length,
style, parent;
while ( i-- ) {
style = this.styles[i];
if ( style.textContent !== css ) { continue; }
parent = style.parentNode;
if ( parent !== null ) {
parent.removeChild(style);
}
this.styles.splice(i, 1);
}
},
toggle: function(state) {
if ( this.styles.length === '' ) { return; }
if ( state === undefined ) {
state = !this.enabled;
}
var i = this.styles.length, style;
while ( i-- ) {
style = this.styles[i];
if ( style.sheet !== null ) {
style.sheet.disabled = !state;
}
}
this.enabled = state;
}
};
})();
// If a platform does not provide its own (improved) vAPI.hideNode, we assign
// a default one to try to override author styles as best as can be.
var platformHideNode = vAPI.hideNode,
platformUnhideNode = vAPI.unhideNode;
(function() {
if ( platformHideNode instanceof Function ) {
return;
}
var uid,
timer,
observer,
changedNodes = [],
observerOptions = {
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attributes: true,
attributeFilter: [ 'style' ]
};
// https://jsperf.com/clientheight-and-clientwidth-vs-getcomputedstyle
// Avoid getComputedStyle(), detecting whether a node is visible can be
// achieved with clientWidth/clientHeight.
// https://gist.github.com/paulirish/5d52fb081b3570c81e3a
// Do not interleave read-from/write-to the DOM. Write-to DOM
// operations would cause the first read-from to be expensive, and
// interleaving means that potentially all single read-from operation
// would be expensive rather than just the 1st one.
// Benchmarking toggling off/on cosmetic filtering confirms quite an
// improvement when:
// - batching as much as possible handling of all nodes;
// - avoiding to interleave read-from/write-to operations.
// However, toggling off/on cosmetic filtering repeatedly is not
// a real use case, but this shows this will help performance
// on sites which try to use inline styles to bypass blockers.
var batchProcess = function() {
timer.clear();
var cNodes = changedNodes, i = cNodes.length,
vNodes = [], j = 0,
node;
while ( i-- ) {
node = cNodes[i];
if ( node[uid] !== undefined && node.clientHeight && node.clientWidth ) {
vNodes[j++] = node;
}
}
cNodes.length = 0;
while ( j-- ) {
node = vNodes[j];
var attr = node.getAttribute('style');
if ( !attr ) {
attr = '';
} else {
attr += '; ';
}
node.setAttribute('style', attr + 'display: none !important;');
}
};
var observerHandler = function(mutations) {
var i = mutations.length,
cNodes = changedNodes,
j = cNodes.length;
while ( i-- ) {
cNodes[j++] = mutations[i].target;
}
timer.start();
};
platformHideNode = function(node) {
if ( uid === undefined ) {
uid = vAPI.randomToken();
timer = new vAPI.SafeAnimationFrame(batchProcess);
}
if ( node[uid] === undefined ) {
node[uid] = node.hasAttribute('style') && (node.getAttribute('style') || '');
}
// Performance: batch-process nodes to hide.
var cNodes = changedNodes;
cNodes[cNodes.length] = node;
timer.start();
if ( observer === undefined ) {
observer = new MutationObserver(observerHandler);
}
observer.observe(node, observerOptions);
};
platformUnhideNode = function(node) {
if ( uid === undefined ) { return; }
var attr = node[uid];
if ( attr === false ) {
node.removeAttribute('style');
} else if ( typeof attr === 'string' ) {
node.setAttribute('style', attr);
}
delete node[uid];
};
})();
/******************************************************************************/
// 'P' stands for 'Procedural'
var PSelectorHasTask = function(task) {
this.selector = task[1];
};
PSelectorHasTask.prototype.exec = function(input) {
var output = [];
for ( var i = 0, n = input.length; i < n; i++ ) {
if ( input[i].querySelector(this.selector) !== null ) {
output.push(input[i]);
}
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}
return output;
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};
var PSelectorHasTextTask = function(task) {
this.needle = new RegExp(task[1]);
};
PSelectorHasTextTask.prototype.exec = function(input) {
var output = [];
for ( var i = 0, n = input.length; i < n; i++ ) {
if ( this.needle.test(input[i].textContent) ) {
output.push(input[i]);
}
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}
return output;
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};
var PSelectorIfTask = function(task) {
this.pselector = new PSelector(task[1]);
};
PSelectorIfTask.prototype.target = true;
PSelectorIfTask.prototype.exec = function(input) {
var output = [];
for ( var i = 0, n = input.length; i < n; i++ ) {
if ( this.pselector.test(input[i]) === this.target ) {
output.push(input[i]);
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}
}
return output;
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};
var PSelectorIfNotTask = function(task) {
PSelectorIfTask.call(this, task);
this.target = false;
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};
PSelectorIfNotTask.prototype = Object.create(PSelectorIfTask.prototype);
PSelectorIfNotTask.prototype.constructor = PSelectorIfNotTask;
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var PSelectorMatchesCSSTask = function(task) {
this.name = task[1].name;
this.value = new RegExp(task[1].value);
};
PSelectorMatchesCSSTask.prototype.pseudo = null;
PSelectorMatchesCSSTask.prototype.exec = function(input) {
var output = [], style;
for ( var i = 0, n = input.length; i < n; i++ ) {
style = window.getComputedStyle(input[i], this.pseudo);
if ( style === null ) { return null; } /* FF */
if ( this.value.test(style[this.name]) ) {
output.push(input[i]);
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}
}
return output;
};
var PSelectorMatchesCSSAfterTask = function(task) {
PSelectorMatchesCSSTask.call(this, task);
this.pseudo = ':after';
};
PSelectorMatchesCSSAfterTask.prototype = Object.create(PSelectorMatchesCSSTask.prototype);
PSelectorMatchesCSSAfterTask.prototype.constructor = PSelectorMatchesCSSAfterTask;
var PSelectorMatchesCSSBeforeTask = function(task) {
PSelectorMatchesCSSTask.call(this, task);
this.pseudo = ':before';
};
PSelectorMatchesCSSBeforeTask.prototype = Object.create(PSelectorMatchesCSSTask.prototype);
PSelectorMatchesCSSBeforeTask.prototype.constructor = PSelectorMatchesCSSBeforeTask;
var PSelectorXpathTask = function(task) {
this.xpe = document.createExpression(task[1], null);
this.xpr = null;
};
PSelectorXpathTask.prototype.exec = function(input) {
var output = [], j, node;
for ( var i = 0, n = input.length; i < n; i++ ) {
this.xpr = this.xpe.evaluate(
input[i],
XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
this.xpr
);
j = this.xpr.snapshotLength;
while ( j-- ) {
node = this.xpr.snapshotItem(j);
if ( node.nodeType === 1 ) {
output.push(node);
}
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}
}
return output;
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};
var PSelector = function(o) {
if ( PSelector.prototype.operatorToTaskMap === undefined ) {
PSelector.prototype.operatorToTaskMap = new Map([
[ ':has', PSelectorHasTask ],
[ ':has-text', PSelectorHasTextTask ],
[ ':if', PSelectorIfTask ],
[ ':if-not', PSelectorIfNotTask ],
[ ':matches-css', PSelectorMatchesCSSTask ],
[ ':matches-css-after', PSelectorMatchesCSSAfterTask ],
[ ':matches-css-before', PSelectorMatchesCSSBeforeTask ],
[ ':xpath', PSelectorXpathTask ]
]);
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}
this.raw = o.raw;
this.selector = o.selector;
this.tasks = [];
var tasks = o.tasks;
if ( !tasks ) { return; }
for ( var i = 0, task, ctor; i < tasks.length; i++ ) {
task = tasks[i];
ctor = this.operatorToTaskMap.get(task[0]);
this.tasks.push(new ctor(task));
}
};
PSelector.prototype.operatorToTaskMap = undefined;
PSelector.prototype.prime = function(input) {
var root = input || document;
if ( this.selector !== '' ) {
return root.querySelectorAll(this.selector);
}
return [ root ];
};
PSelector.prototype.exec = function(input) {
//var t0 = window.performance.now();
var tasks = this.tasks, nodes = this.prime(input);
for ( var i = 0, n = tasks.length; i < n && nodes.length !== 0; i++ ) {
nodes = tasks[i].exec(nodes);
}
//console.log('%s: %s ms', this.raw, (window.performance.now() - t0).toFixed(2));
return nodes;
};
PSelector.prototype.test = function(input) {
//var t0 = window.performance.now();
var tasks = this.tasks, nodes = this.prime(input), AA = [ null ], aa;
for ( var i = 0, ni = nodes.length; i < ni; i++ ) {
AA[0] = nodes[i]; aa = AA;
for ( var j = 0, nj = tasks.length; j < nj && aa.length !== 0; j++ ) {
aa = tasks[j].exec(aa);
}
if ( aa.length !== 0 ) { return true; }
}
//console.log('%s: %s ms', this.raw, (window.performance.now() - t0).toFixed(2));
return false;
};
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/******************************************************************************/
var domFilterer = {
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addedNodesHandlerMissCount: 0,
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commitTimer: null,
disabledId: vAPI.randomToken(),
enabled: true,
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excludeId: undefined,
hiddenId: vAPI.randomToken(),
hiddenNodeCount: 0,
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hiddenNodeEnforcer: false,
loggerEnabled: undefined,
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newHideSelectorBuffer: [], // Hide style filter buffer
newStyleRuleBuffer: [], // Non-hide style filter buffer
simpleHideSelectors: { // Hiding filters: simple selectors
entries: [],
matchesProp: vAPI.matchesProp,
selector: undefined,
add: function(selector) {
this.entries.push(selector);
this.selector = undefined;
},
forEachNode: function(callback, root, extra) {
if ( this.selector === undefined ) {
this.selector = this.entries.join(extra + ',') + extra;
}
if ( root[this.matchesProp](this.selector) ) {
callback(root);
}
var nodes = root.querySelectorAll(this.selector),
i = nodes.length;
while ( i-- ) {
callback(nodes[i]);
}
}
},
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complexHideSelectors: { // Hiding filters: complex selectors
entries: [],
selector: undefined,
add: function(selector) {
this.entries.push(selector);
this.selector = undefined;
},
forEachNode: function(callback) {
if ( this.selector === undefined ) {
this.selector = this.entries.join(',');
}
var nodes = document.querySelectorAll(this.selector),
i = nodes.length;
while ( i-- ) {
callback(nodes[i]);
}
}
},
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nqsSelectors: [], // Non-querySelector-able filters
proceduralSelectors: { // Hiding filters: procedural
entries: [],
add: function(o) {
this.entries.push(new PSelector(o));
},
forEachNode: function(callback) {
var pfilters = this.entries, i = pfilters.length, pfilter, nodes, j;
while ( i-- ) {
pfilter = pfilters[i];
nodes = pfilter.exec();
j = nodes.length;
while ( j-- ) {
callback(nodes[j], pfilter);
}
}
}
},
addExceptions: function(aa) {
for ( var i = 0, n = aa.length; i < n; i++ ) {
allExceptions.add(aa[i]);
}
},
addSelector: function(selector) {
if ( allSelectors.has(selector) || allExceptions.has(selector) ) {
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return;
}
allSelectors.add(selector);
if ( selector.charCodeAt(0) !== 0x7B /* '{' */ ) {
this.newHideSelectorBuffer.push(selector);
if ( selector.indexOf(' ') === -1 ) {
this.simpleHideSelectors.add(selector);
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} else {
this.complexHideSelectors.add(selector);
}
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return;
}
var o = JSON.parse(selector);
if ( o.style ) {
this.newStyleRuleBuffer.push(o.style.join(' '));
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this.nqsSelectors.push(o.raw);
return;
}
if ( o.pseudoclass ) {
this.newHideSelectorBuffer.push(o.raw);
this.nqsSelectors.push(o.raw);
return;
}
if ( o.tasks ) {
this.proceduralSelectors.add(o);
return;
}
},
addSelectors: function(aa) {
for ( var i = 0, n = aa.length; i < n; i++ ) {
this.addSelector(aa[i]);
}
},
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commit_: function() {
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this.commitTimer.clear();
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var beforeHiddenNodeCount = this.hiddenNodeCount,
styleText = '', i;
// CSS rules/hide
if ( this.newHideSelectorBuffer.length ) {
styleText = '\n:root ' + this.newHideSelectorBuffer.join(',\n:root ') + '\n{ display: none !important; }';
this.newHideSelectorBuffer.length = 0;
}
// CSS rules/any css declaration
if ( this.newStyleRuleBuffer.length ) {
styleText += '\n' + this.newStyleRuleBuffer.join('\n');
this.newStyleRuleBuffer.length = 0;
}
// Simple selectors: incremental.
// Simple css selectors/hide
if ( this.simpleHideSelectors.entries.length ) {
i = stagedNodes.length;
while ( i-- ) {
this.simpleHideSelectors.forEachNode(hideNode, stagedNodes[i], cssNotHiddenId);
}
}
stagedNodes = [];
// Complex selectors: non-incremental.
complexSelectorsOldResultSet = complexSelectorsCurrentResultSet;
complexSelectorsCurrentResultSet = createSet('object');
// Complex css selectors/hide
// The handling of these can be considered optional, since they are
// also applied declaratively using a style tag.
if ( this.complexHideSelectors.entries.length ) {
this.complexHideSelectors.forEachNode(complexHideNode);
}
// Procedural cosmetic filters
if ( this.proceduralSelectors.entries.length ) {
this.proceduralSelectors.forEachNode(complexHideNode);
}
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// https://github.com/gorhill/uBlock/issues/1912
// If one or more nodes have been manually hidden, insert a style tag
// targeting these manually hidden nodes. For browsers supporting
// user styles, this allows uBO to win.
var commitHit = this.hiddenNodeCount !== beforeHiddenNodeCount;
if ( commitHit ) {
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if ( this.hiddenNodeEnforcer === false ) {
styleText += '\n:root *[' + this.hiddenId + '][hidden] { display: none !important; }';
this.hiddenNodeEnforcer = true;
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}
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this.addedNodesHandlerMissCount = 0;
} else {
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this.addedNodesHandlerMissCount += 1;
}
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if ( styleText !== '' ) {
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platformUserCSS.add(styleText);
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}
// Un-hide nodes previously hidden.
i = complexSelectorsOldResultSet.size;
if ( i !== 0 ) {
var iter = complexSelectorsOldResultSet.values();
while ( i-- ) {
this.unhideNode(iter.next().value);
}
complexSelectorsOldResultSet.clear();
}
// If DOM nodes have been affected, lazily notify core process.
if (
this.loggerEnabled !== false &&
commitHit &&
cosmeticFiltersActivatedTimer === null
) {
cosmeticFiltersActivatedTimer = vAPI.setTimeout(
cosmeticFiltersActivated,
503
);
}
},
commit: function(nodes, commitNow) {
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if ( nodes === 'all' ) {
stagedNodes = [ document.documentElement ];
} else if ( stagedNodes[0] !== document.documentElement ) {
stagedNodes = stagedNodes.concat(nodes);
}
if ( commitNow ) {
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this.commitTimer.clear();
this.commit_();
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return;
}
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this.commitTimer.start();
},
createProceduralFilter: function(o) {
return new PSelector(o);
},
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getExcludeId: function() {
if ( this.excludeId === undefined ) {
this.excludeId = vAPI.randomToken();
}
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return this.excludeId;
},
hideNode: function(node) {
if ( node[this.hiddenId] !== undefined ) { return; }
if ( this.excludeId !== undefined && node[this.excludeId] ) { return; }
node.setAttribute(this.hiddenId, '');
this.hiddenNodeCount += 1;
node.hidden = true;
node[this.hiddenId] = null;
platformHideNode(node);
},
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init: function() {
this.commitTimer = new vAPI.SafeAnimationFrame(this.commit_.bind(this));
},
showNode: function(node) {
node.hidden = false;
platformUnhideNode(node);
},
toggleLogging: function(state) {
this.loggerEnabled = state;
},
toggleOff: function() {
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platformUserCSS.toggle(false);
this.enabled = false;
},
toggleOn: function() {
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platformUserCSS.toggle(true);
this.enabled = true;
},
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userCSS: platformUserCSS,
unhideNode: function(node) {
if ( node[this.hiddenId] !== undefined ) {
this.hiddenNodeCount--;
}
node.removeAttribute(this.hiddenId);
node[this.hiddenId] = undefined;
node.hidden = false;
platformUnhideNode(node);
},
unshowNode: function(node) {
node.hidden = true;
platformHideNode(node);
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},
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domChangedHandler: function(addedNodes) {
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this.commit(addedNodes);
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},
start: function() {
var domChangedHandler = this.domChangedHandler.bind(this);
vAPI.domWatcher.addListener(domChangedHandler);
vAPI.shutdown.add(function() {
vAPI.domWatcher.removeListener(domChangedHandler);
});
}
};
/******************************************************************************/
var hideNode = domFilterer.hideNode.bind(domFilterer);
var complexHideNode = function(node) {
complexSelectorsCurrentResultSet.add(node);
if ( !complexSelectorsOldResultSet.delete(node) ) {
hideNode(node);
}
};
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var cssNotHiddenId = ':not([' + domFilterer.hiddenId + '])';
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domFilterer.init();
/******************************************************************************/
return domFilterer;
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/******************************************************************************/
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})();
/******************************************************************************/
/******************************************************************************/
/******************************************************************************/
// This is executed once, and since no hooks are left behind once the response
// is received, I expect this code to be garbage collected by the browser.
(function domIsLoading() {
var responseHandler = function(response) {
// cosmetic filtering engine aka 'cfe'
var cfeDetails = response && response.specificCosmeticFilters;
if ( !cfeDetails || !cfeDetails.ready ) {
vAPI.domWatcher = vAPI.domCollapser = vAPI.domFilterer =
vAPI.domSurveyor = vAPI.domIsLoaded = null;
vAPI.unlock();
return;
}
if ( response.noCosmeticFiltering ) {
vAPI.domFilterer = null;
vAPI.domSurveyor = null;
} else {
var domFilterer = vAPI.domFilterer;
domFilterer.toggleLogging(response.loggerEnabled);
if ( response.noGenericCosmeticFiltering || cfeDetails.noDOMSurveying ) {
vAPI.domSurveyor = null;
}
if ( cfeDetails.cosmeticHide.length !== 0 || cfeDetails.cosmeticDonthide.length !== 0 ) {
domFilterer.addExceptions(cfeDetails.cosmeticDonthide);
domFilterer.addSelectors(cfeDetails.cosmeticHide);
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domFilterer.commit('all', true);
}
}
var parent = document.head || document.documentElement;
if ( parent ) {
var elem, text;
if ( cfeDetails.netHide.length !== 0 ) {
elem = document.createElement('style');
elem.setAttribute('type', 'text/css');
text = cfeDetails.netHide.join(',\n');
text += response.collapseBlocked ?
'\n{display:none !important;}' :
'\n{visibility:hidden !important;}';
elem.appendChild(document.createTextNode(text));
parent.appendChild(elem);
}
// Library of resources is located at:
// https://github.com/gorhill/uBlock/blob/master/assets/ublock/resources.txt
if ( cfeDetails.scripts ) {
elem = document.createElement('script');
// Have the injected script tag remove itself when execution completes:
// to keep DOM as clean as possible.
text = cfeDetails.scripts +
"\n" +
"(function() {\n" +
" var c = document.currentScript,\n" +
" p = c && c.parentNode;\n" +
" if ( p ) {\n" +
" p.removeChild(c);\n" +
" }\n" +
"})();";
elem.appendChild(document.createTextNode(text));
parent.appendChild(elem);
vAPI.injectedScripts = text;
}
}
// https://github.com/chrisaljoudi/uBlock/issues/587
// If no filters were found, maybe the script was injected before
// uBlock's process was fully initialized. When this happens, pages
// won't be cleaned right after browser launch.
if ( document.readyState !== 'loading' ) {
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(new vAPI.SafeAnimationFrame(vAPI.domIsLoaded)).start();
} else {
document.addEventListener('DOMContentLoaded', vAPI.domIsLoaded);
}
};
var url = window.location.href;
vAPI.messaging.send(
'contentscript',
{
what: 'retrieveContentScriptParameters',
pageURL: url,
locationURL: url
},
responseHandler
);
})();
/******************************************************************************/
/******************************************************************************/
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/******************************************************************************/
vAPI.domWatcher = (function() {
var domLayoutObserver = null,
ignoreTags = { 'head': 1, 'link': 1, 'meta': 1, 'script': 1, 'style': 1 },
addedNodeLists = [],
addedNodes = [],
removedNodes = false,
listeners = [];
var safeObserverHandler = function() {
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safeObserverHandlerTimer.clear();
var i = addedNodeLists.length,
nodeList, iNode, node;
while ( i-- ) {
nodeList = addedNodeLists[i];
iNode = nodeList.length;
while ( iNode-- ) {
node = nodeList[iNode];
if ( node.nodeType !== 1 ) {
continue;
}
if ( ignoreTags[node.localName] === 1 ) {
continue;
}
addedNodes.push(node);
}
}
addedNodeLists.length = 0;
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if ( addedNodes.length !== 0 || removedNodes ) {
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listeners[0](addedNodes);
if ( listeners[1] ) {
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listeners[1](addedNodes);
}
addedNodes.length = 0;
removedNodes = false;
}
};
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var safeObserverHandlerTimer = new vAPI.SafeAnimationFrame(safeObserverHandler);
// https://github.com/chrisaljoudi/uBlock/issues/205
// Do not handle added node directly from within mutation observer.
var observerHandler = function(mutations) {
var nodeList, mutation,
i = mutations.length;
while ( i-- ) {
mutation = mutations[i];
nodeList = mutation.addedNodes;
if ( nodeList.length !== 0 ) {
addedNodeLists.push(nodeList);
}
if ( mutation.removedNodes.length !== 0 ) {
removedNodes = true;
}
}
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if ( addedNodeLists.length !== 0 || removedNodes ) {
safeObserverHandlerTimer.start();
}
};
var addListener = function(listener) {
if ( listeners.indexOf(listener) !== -1 ) {
return;
}
listeners.push(listener);
if ( domLayoutObserver !== null ) {
return;
}
domLayoutObserver = new MutationObserver(observerHandler);
domLayoutObserver.observe(document.documentElement, {
//attributeFilter: [ 'class', 'id' ],
//attributes: true,
childList: true,
subtree: true
});
};
var removeListener = function(listener) {
var pos = listeners.indexOf(listener);
if ( pos === -1 ) {
return;
}
listeners.splice(pos, 1);
if ( listeners.length !== 0 || domLayoutObserver === null ) {
return;
}
domLayoutObserver.disconnect();
domLayoutObserver = null;
};
var start = function() {
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vAPI.shutdown.add(function() {
if ( domLayoutObserver !== null ) {
domLayoutObserver.disconnect();
domLayoutObserver = null;
}
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safeObserverHandlerTimer.clear();
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});
};
return {
addListener: addListener,
removeListener: removeListener,
start: start
};
})();
/******************************************************************************/
/******************************************************************************/
/******************************************************************************/
vAPI.domCollapser = (function() {
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var timer = null;
var pendingRequests = Object.create(null);
var roundtripRequests = [];
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var src1stProps = {
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'embed': 'src',
'img': 'src',
'object': 'data'
};
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var src2ndProps = {
'img': 'srcset'
};
var netSelectorCacheCount = 0;
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var messaging = vAPI.messaging;
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// Because a while ago I have observed constructors are faster than
// literal object instanciations.
var RoundtripRequest = function(tag, attr, url) {
this.tag = tag;
this.attr = attr;
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this.url = url;
this.collapse = false;
};
var onProcessed = function(response) {
// This can happens if uBO is restarted.
if ( !response ) {
return;
}
var requests = response.result;
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if ( requests === null || Array.isArray(requests) === false ) {
return;
}
var selectors = [],
netSelectorCacheCountMax = response.netSelectorCacheCountMax,
aa = [ null ],
request, key, entry, target, value;
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// https://github.com/gorhill/uBlock/issues/2256
var iframeLoadEventPatch = vAPI.iframeLoadEventPatch;
// Important: process in chronological order -- this ensures the
// cached selectors are the most useful ones.
for ( var i = 0, ni = requests.length; i < ni; i++ ) {
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request = requests[i];
key = request.tag + ' ' + request.attr + ' ' + request.url;
entry = pendingRequests[key];
if ( entry === undefined ) {
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continue;
}
delete pendingRequests[key];
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// https://github.com/chrisaljoudi/uBlock/issues/869
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if ( !request.collapse ) {
continue;
}
if ( Array.isArray(entry) === false ) {
aa[0] = entry;
entry = aa;
}
for ( var j = 0, nj = entry.length; j < nj; j++ ) {
target = entry[j];
// https://github.com/chrisaljoudi/uBlock/issues/399
// Never remove elements from the DOM, just hide them
target.style.setProperty('display', 'none', 'important');
target.hidden = true;
// https://github.com/chrisaljoudi/uBlock/issues/1048
// Use attribute to construct CSS rule
if (
netSelectorCacheCount <= netSelectorCacheCountMax &&
(value = target.getAttribute(request.attr))
) {
selectors.push(request.tag + '[' + request.attr + '="' + value + '"]');
netSelectorCacheCount += 1;
}
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if ( iframeLoadEventPatch ) { iframeLoadEventPatch(target); }
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}
}
if ( selectors.length !== 0 ) {
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messaging.send(
'contentscript',
{
what: 'cosmeticFiltersInjected',
type: 'net',
hostname: window.location.hostname,
selectors: selectors
}
);
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}
};
var send = function() {
timer = null;
// https://github.com/gorhill/uBlock/issues/1927
// Normalize hostname to avoid trailing dot of FQHN.
var pageHostname = window.location.hostname || '';
if (
pageHostname.length &&
pageHostname.charCodeAt(pageHostname.length - 1) === 0x2e
) {
pageHostname = pageHostname.slice(0, -1);
}
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messaging.send(
'contentscript',
{
what: 'filterRequests',
pageURL: window.location.href,
pageHostname: pageHostname,
requests: roundtripRequests
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}, onProcessed
);
roundtripRequests = [];
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};
var process = function(delay) {
if ( roundtripRequests.length === 0 ) {
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return;
}
if ( delay === 0 ) {
clearTimeout(timer);
send();
} else if ( timer === null ) {
timer = vAPI.setTimeout(send, delay || 20);
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}
};
var add = function(target) {
var tag = target.localName;
var prop = src1stProps[tag];
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if ( prop === undefined ) {
return;
}
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// https://github.com/chrisaljoudi/uBlock/issues/174
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// Do not remove fragment from src URL
var src = target[prop];
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if ( typeof src !== 'string' || src.length === 0 ) {
prop = src2ndProps[tag];
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if ( prop === undefined ) {
return;
}
src = target[prop];
if ( typeof src !== 'string' || src.length === 0 ) {
return;
}
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}
if ( src.lastIndexOf('http', 0) !== 0 ) {
return;
}
var key = tag + ' ' + prop + ' ' + src,
entry = pendingRequests[key];
if ( entry === undefined ) {
pendingRequests[key] = target;
roundtripRequests.push(new RoundtripRequest(tag, prop, src));
} else if ( Array.isArray(entry) ) {
entry.push(target);
} else {
pendingRequests[key] = [ entry, target ];
}
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};
var addMany = function(targets) {
var i = targets.length;
while ( i-- ) {
add(targets[i]);
}
};
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var iframeSourceModified = function(mutations) {
var i = mutations.length;
while ( i-- ) {
addIFrame(mutations[i].target, true);
}
process();
};
var iframeSourceObserver = new MutationObserver(iframeSourceModified);
var iframeSourceObserverOptions = {
attributes: true,
attributeFilter: [ 'src' ]
};
var primeLocalIFrame = function(iframe) {
// Should probably also copy injected styles.
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// The injected scripts are those which were injected in the current
// document, from within the `contentscript-start.js / injectScripts`,
// and which scripts are selectively looked-up from:
// https://github.com/gorhill/uBlock/blob/master/assets/ublock/resources.txt
if ( vAPI.injectedScripts ) {
var scriptTag = document.createElement('script');
scriptTag.appendChild(document.createTextNode(vAPI.injectedScripts));
var parent = iframe.contentDocument && iframe.contentDocument.head;
if ( parent ) {
parent.appendChild(scriptTag);
}
}
};
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var addIFrame = function(iframe, dontObserve) {
// https://github.com/gorhill/uBlock/issues/162
// Be prepared to deal with possible change of src attribute.
if ( dontObserve !== true ) {
iframeSourceObserver.observe(iframe, iframeSourceObserverOptions);
}
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var src = iframe.src;
if ( src === '' || typeof src !== 'string' ) {
primeLocalIFrame(iframe);
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return;
}
if ( src.lastIndexOf('http', 0) !== 0 ) {
return;
}
var key = 'iframe' + ' ' + 'src' + ' ' + src,
entry = pendingRequests[key];
if ( entry === undefined ) {
pendingRequests[key] = iframe;
roundtripRequests.push(new RoundtripRequest('iframe', 'src', src));
} else if ( Array.isArray(entry) ) {
entry.push(iframe);
} else {
pendingRequests[key] = [ entry, iframe ];
}
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};
var addIFrames = function(iframes) {
var i = iframes.length;
while ( i-- ) {
addIFrame(iframes[i]);
}
};
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var onResourceFailed = function(ev) {
vAPI.domCollapser.add(ev.target);
vAPI.domCollapser.process();
};
var domChangedHandler = function(nodes) {
var node;
for ( var i = 0, ni = nodes.length; i < ni; i++ ) {
node = nodes[i];
if ( node.localName === 'iframe' ) {
addIFrame(node);
}
if ( node.children && node.children.length !== 0 ) {
var iframes = node.getElementsByTagName('iframe');
if ( iframes.length !== 0 ) {
addIFrames(iframes);
}
}
}
process();
};
var start = function() {
// Listener to collapse blocked resources.
// - Future requests not blocked yet
// - Elements dynamically added to the page
// - Elements which resource URL changes
// https://github.com/chrisaljoudi/uBlock/issues/7
// Preferring getElementsByTagName over querySelectorAll:
// http://jsperf.com/queryselectorall-vs-getelementsbytagname/145
var elems = document.images || document.getElementsByTagName('img'),
i = elems.length, elem;
while ( i-- ) {
elem = elems[i];
if ( elem.complete ) {
add(elem);
}
}
addMany(document.embeds || document.getElementsByTagName('embed'));
addMany(document.getElementsByTagName('object'));
addIFrames(document.getElementsByTagName('iframe'));
process(0);
document.addEventListener('error', onResourceFailed, true);
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vAPI.domWatcher.addListener(domChangedHandler);
vAPI.shutdown.add(function() {
document.removeEventListener('error', onResourceFailed, true);
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vAPI.domWatcher.removeListener(domChangedHandler);
if ( timer !== null ) {
clearTimeout(timer);
}
});
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};
return {
add: add,
addMany: addMany,
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addIFrame: addIFrame,
addIFrames: addIFrames,
process: process,
start: start
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};
})();
/******************************************************************************/
/******************************************************************************/
/******************************************************************************/
vAPI.domSurveyor = (function() {
var domFilterer = null,
messaging = vAPI.messaging,
surveyPhase3Nodes = [],
cosmeticSurveyingMissCount = 0,
highGenerics = null,
lowGenericSelectors = [],
queriedSelectors = createSet(),
surveyCost = 0;
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// Handle main process' response.
var surveyPhase3 = function(response) {
var result = response && response.result,
firstSurvey = highGenerics === null;
if ( result ) {
if ( result.hide.length ) {
processLowGenerics(result.hide);
}
if ( result.highGenerics ) {
highGenerics = result.highGenerics;
}
}
if ( highGenerics ) {
var t0 = window.performance.now();
if ( highGenerics.hideLowCount ) {
processHighLowGenerics(highGenerics.hideLow);
}
if ( highGenerics.hideMediumCount ) {
processHighMediumGenerics(highGenerics.hideMedium);
}
if ( highGenerics.hideHighSimpleCount || highGenerics.hideHighComplexCount ) {
processHighHighGenerics();
}
surveyCost += window.performance.now() - t0;
}
// Need to do this before committing DOM filterer, as needed info
// will no longer be there after commit.
if ( firstSurvey || domFilterer.newHideSelectorBuffer.length ) {
messaging.send(
'contentscript',
{
what: 'cosmeticFiltersInjected',
type: 'cosmetic',
hostname: window.location.hostname,
selectors: domFilterer.newHideSelectorBuffer,
first: firstSurvey,
cost: surveyCost
}
);
}
// Shutdown surveyor if too many consecutive empty resultsets.
if ( domFilterer.newHideSelectorBuffer.length === 0 ) {
cosmeticSurveyingMissCount += 1;
} else {
cosmeticSurveyingMissCount = 0;
}
domFilterer.commit(surveyPhase3Nodes);
surveyPhase3Nodes = [];
};
// Query main process.
var surveyPhase2 = function(addedNodes) {
surveyPhase3Nodes = surveyPhase3Nodes.concat(addedNodes);
if ( lowGenericSelectors.length !== 0 || highGenerics === null ) {
messaging.send(
'contentscript',
{
what: 'retrieveGenericCosmeticSelectors',
pageURL: window.location.href,
selectors: lowGenericSelectors,
firstSurvey: highGenerics === null
},
surveyPhase3
);
lowGenericSelectors = [];
} else {
surveyPhase3(null);
}
};
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// Low generics:
// - [id]
// - [class]
var processLowGenerics = function(generics) {
domFilterer.addSelectors(generics);
};
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// High-low generics:
// - [alt="..."]
// - [title="..."]
var processHighLowGenerics = function(generics) {
var attrs = ['title', 'alt'];
var attr, attrValue, nodeList, iNode, node;
var selector;
while ( (attr = attrs.pop()) ) {
nodeList = selectNodes('[' + attr + ']', surveyPhase3Nodes);
iNode = nodeList.length;
while ( iNode-- ) {
node = nodeList[iNode];
attrValue = node.getAttribute(attr);
if ( !attrValue ) { continue; }
// Candidate 1 = generic form
// If generic form is injected, no need to process the
// specific form, as the generic will affect all related
// specific forms.
selector = '[' + attr + '="' + attrValue + '"]';
if ( generics.hasOwnProperty(selector) ) {
domFilterer.addSelector(selector);
continue;
}
// Candidate 2 = specific form
selector = node.localName + selector;
if ( generics.hasOwnProperty(selector) ) {
domFilterer.addSelector(selector);
}
}
}
};
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// High-medium generics:
// - [href^="http"]
var processHighMediumGenerics = function(generics) {
var stagedNodes = surveyPhase3Nodes,
i = stagedNodes.length;
if ( i === 1 && stagedNodes[0] === document.documentElement ) {
processHighMediumGenericsForNodes(document.links, generics);
return;
}
var aa = [ null ],
node, nodes;
while ( i-- ) {
node = stagedNodes[i];
if ( node.localName === 'a' ) {
aa[0] = node;
processHighMediumGenericsForNodes(aa, generics);
}
nodes = node.getElementsByTagName('a');
if ( nodes.length !== 0 ) {
processHighMediumGenericsForNodes(nodes, generics);
2014-07-02 10:02:29 -06:00
}
}
};
var processHighMediumGenericsForNodes = function(nodes, generics) {
var i = nodes.length,
node, href, pos, entry, j, selector;
while ( i-- ) {
node = nodes[i];
href = node.getAttribute('href');
if ( !href ) { continue; }
pos = href.indexOf('://');
if ( pos === -1 ) { continue; }
entry = generics[href.slice(pos + 3, pos + 11)];
if ( entry === undefined ) { continue; }
if ( typeof entry === 'string' ) {
if ( href.lastIndexOf(entry.slice(8, -2), 0) === 0 ) {
domFilterer.addSelector(entry);
}
continue;
}
j = entry.length;
while ( j-- ) {
selector = entry[j];
if ( href.lastIndexOf(selector.slice(8, -2), 0) === 0 ) {
domFilterer.addSelector(selector);
}
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}
}
};
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var highHighSimpleGenericsCost = 0,
highHighSimpleGenericsInjected = false,
highHighComplexGenericsCost = 0,
highHighComplexGenericsInjected = false;
var processHighHighGenerics = function() {
var tstart;
// Simple selectors.
if (
highHighSimpleGenericsInjected === false &&
highHighSimpleGenericsCost < 50 &&
highGenerics.hideHighSimpleCount !== 0
) {
tstart = window.performance.now();
var matchesProp = vAPI.matchesProp,
nodes = surveyPhase3Nodes,
i = nodes.length, node;
while ( i-- ) {
node = nodes[i];
if (
node[matchesProp](highGenerics.hideHighSimple) ||
node.querySelector(highGenerics.hideHighSimple) !== null
) {
highHighSimpleGenericsInjected = true;
domFilterer.addSelectors(highGenerics.hideHighSimple.split(',\n'));
break;
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}
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}
highHighSimpleGenericsCost += window.performance.now() - tstart;
}
// Complex selectors.
if (
highHighComplexGenericsInjected === false &&
highHighComplexGenericsCost < 50 &&
highGenerics.hideHighComplexCount !== 0
) {
tstart = window.performance.now();
if ( document.querySelector(highGenerics.hideHighComplex) !== null ) {
highHighComplexGenericsInjected = true;
domFilterer.addSelectors(highGenerics.hideHighComplex.split(',\n'));
}
highHighComplexGenericsCost += window.performance.now() - tstart;
}
};
// Extract and return the staged nodes which (may) match the selectors.
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var selectNodes = function(selector, nodes) {
var stagedNodes = nodes,
i = stagedNodes.length;
if ( i === 1 && stagedNodes[0] === document.documentElement ) {
return document.querySelectorAll(selector);
}
var targetNodes = [],
node, nodeList, j;
while ( i-- ) {
node = stagedNodes[i];
targetNodes.push(node);
nodeList = node.querySelectorAll(selector);
j = nodeList.length;
while ( j-- ) {
targetNodes.push(nodeList[j]);
}
}
return targetNodes;
};
// Extract all classes/ids: these will be passed to the cosmetic
// filtering engine, and in return we will obtain only the relevant
// CSS selectors.
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// https://github.com/gorhill/uBlock/issues/672
// http://www.w3.org/TR/2014/REC-html5-20141028/infrastructure.html#space-separated-tokens
// http://jsperf.com/enumerate-classes/6
var surveyPhase1 = function(addedNodes) {
var t0 = window.performance.now(),
rews = reWhitespace,
qq = queriedSelectors,
ll = lowGenericSelectors,
lli = ll.length,
nodes, i, node, v, vv, j;
nodes = selectNodes('[id]', addedNodes);
i = nodes.length;
while ( i-- ) {
node = nodes[i];
v = node.id;
if ( typeof v !== 'string' ) { continue; }
v = '#' + v.trim();
if ( !qq.has(v) && v.length !== 1 ) {
ll[lli] = v; lli++; qq.add(v);
}
}
nodes = selectNodes('[class]', addedNodes);
i = nodes.length;
while ( i-- ) {
node = nodes[i];
vv = node.className;
if ( typeof vv !== 'string' ) { continue; }
if ( !rews.test(vv) ) {
v = '.' + vv;
if ( !qq.has(v) && v.length !== 1 ) {
ll[lli] = v; lli++; qq.add(v);
}
} else {
vv = node.classList;
j = vv.length;
while ( j-- ) {
v = '.' + vv[j];
if ( !qq.has(v) ) {
ll[lli] = v; lli++; qq.add(v);
}
}
}
}
surveyCost += window.performance.now() - t0;
surveyPhase2(addedNodes);
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};
var reWhitespace = /\s/;
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var domChangedHandler = function(addedNodes) {
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if ( cosmeticSurveyingMissCount > 255 ) {
vAPI.domWatcher.removeListener(domChangedHandler);
vAPI.domSurveyor = null;
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domFilterer.domChangedHandler(addedNodes);
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domFilterer.start();
return;
}
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surveyPhase1(addedNodes);
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};
var start = function() {
domFilterer = vAPI.domFilterer;
domChangedHandler([ document.documentElement ]);
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vAPI.domWatcher.addListener(domChangedHandler);
vAPI.shutdown.add(function() {
vAPI.domWatcher.removeListener(domChangedHandler);
});
};
return {
start: start
};
})();
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/******************************************************************************/
/******************************************************************************/
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/******************************************************************************/
vAPI.domIsLoaded = function(ev) {
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// This can happen on Firefox. For instance:
// https://github.com/gorhill/uBlock/issues/1893
if ( window.location === null ) {
return;
}
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var slowLoad = ev instanceof Event;
if ( slowLoad ) {
document.removeEventListener('DOMContentLoaded', vAPI.domIsLoaded);
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}
vAPI.domIsLoaded = null;
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vAPI.domWatcher.start();
vAPI.domCollapser.start();
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if ( vAPI.domFilterer ) {
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// To avoid neddless CPU overhead, we commit existing cosmetic filters
// only if the page loaded "slowly", i.e. if the code here had to wait
// for a DOMContentLoaded event -- in which case the DOM may have
// changed a lot since last time the domFilterer acted on it.
if ( slowLoad ) {
vAPI.domFilterer.commit('all');
}
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if ( vAPI.domSurveyor ) {
vAPI.domSurveyor.start();
} else {
vAPI.domFilterer.start();
}
}
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// To send mouse coordinates to main process, as the chrome API fails
// to provide the mouse position to context menu listeners.
// https://github.com/chrisaljoudi/uBlock/issues/1143
// Also, find a link under the mouse, to try to avoid confusing new tabs
// as nuisance popups.
// Ref.: https://developer.mozilla.org/en-US/docs/Web/Events/contextmenu
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var onMouseClick = function(ev) {
var elem = ev.target;
while ( elem !== null && elem.localName !== 'a' ) {
elem = elem.parentElement;
}
vAPI.messaging.send(
'contentscript',
{
what: 'mouseClick',
x: ev.clientX,
y: ev.clientY,
url: elem !== null ? elem.href : ''
}
);
};
(function() {
if ( window !== window.top || !vAPI.domFilterer ) {
return;
}
document.addEventListener('mousedown', onMouseClick, true);
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// https://github.com/gorhill/uMatrix/issues/144
vAPI.shutdown.add(function() {
document.removeEventListener('mousedown', onMouseClick, true);
});
})();
};
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/******************************************************************************/
/******************************************************************************/
/******************************************************************************/