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Fix quadratic behavior in DOMLex due to array_shift.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
This commit is contained in:
Edward Z. Yang 2013-09-17 00:48:42 -07:00
parent cf44f399f8
commit 412bae13b5
6 changed files with 188 additions and 128 deletions

2
NEWS
View File

@ -17,6 +17,8 @@ NEWS ( CHANGELOG and HISTORY ) HTMLPurifier
Michael Gusev <mgusev@sugarcrm.com> for fixing. Michael Gusev <mgusev@sugarcrm.com> for fixing.
! New directive %Core.AllowHostnameUnderscore which allows underscores ! New directive %Core.AllowHostnameUnderscore which allows underscores
in hostnames. in hostnames.
- Eliminate quadratic behavior in DOMLex by using a proper queue.
Thanks Ole Laursen for noticing this.
- Made Linkify URL parser a bit less permissive, so that non-breaking - Made Linkify URL parser a bit less permissive, so that non-breaking
spaces and commas are not included as part of URL. Thanks nAS for fixing. spaces and commas are not included as part of URL. Thanks nAS for fixing.
- Fix some bad interactions with %HTML.Allowed and injectors. Thanks - Fix some bad interactions with %HTML.Allowed and injectors. Thanks

View File

@ -2,551 +2,551 @@
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</directive> </directive>
<directive id="Filter.ExtractStyleBlocks.Escaping"> <directive id="Filter.ExtractStyleBlocks.Escaping">
<file name="HTMLPurifier/Filter/ExtractStyleBlocks.php"> <file name="HTMLPurifier/Filter/ExtractStyleBlocks.php">
<line>277</line> <line>327</line>
</file> </file>
</directive> </directive>
<directive id="HTML.SafeIframe"> <directive id="HTML.SafeIframe">
<file name="HTMLPurifier/HTMLModule/Iframe.php"> <file name="HTMLPurifier/HTMLModule/Iframe.php">
<line>17</line> <line>28</line>
</file> </file>
<file name="HTMLPurifier/URIFilter/SafeIframe.php"> <file name="HTMLPurifier/URIFilter/SafeIframe.php">
<line>23</line> <line>48</line>
</file> </file>
</directive> </directive>
<directive id="HTML.MaxImgLength"> <directive id="HTML.MaxImgLength">
<file name="HTMLPurifier/HTMLModule/Image.php"> <file name="HTMLPurifier/HTMLModule/Image.php">
<line>14</line> <line>21</line>
</file> </file>
<file name="HTMLPurifier/HTMLModule/SafeEmbed.php"> <file name="HTMLPurifier/HTMLModule/SafeEmbed.php">
<line>13</line> <line>18</line>
</file> </file>
<file name="HTMLPurifier/HTMLModule/SafeObject.php"> <file name="HTMLPurifier/HTMLModule/SafeObject.php">
<line>19</line> <line>24</line>
</file> </file>
</directive> </directive>
<directive id="HTML.TidyLevel"> <directive id="HTML.TidyLevel">
<file name="HTMLPurifier/HTMLModule/Tidy.php"> <file name="HTMLPurifier/HTMLModule/Tidy.php">
<line>45</line> <line>50</line>
</file> </file>
</directive> </directive>
<directive id="HTML.TidyAdd"> <directive id="HTML.TidyAdd">
<file name="HTMLPurifier/HTMLModule/Tidy.php"> <file name="HTMLPurifier/HTMLModule/Tidy.php">
<line>49</line> <line>54</line>
</file> </file>
</directive> </directive>
<directive id="HTML.TidyRemove"> <directive id="HTML.TidyRemove">
<file name="HTMLPurifier/HTMLModule/Tidy.php"> <file name="HTMLPurifier/HTMLModule/Tidy.php">
<line>50</line> <line>55</line>
</file> </file>
</directive> </directive>
<directive id="AutoFormat.PurifierLinkify.DocURL"> <directive id="AutoFormat.PurifierLinkify.DocURL">
<file name="HTMLPurifier/Injector/PurifierLinkify.php"> <file name="HTMLPurifier/Injector/PurifierLinkify.php">
<line>15</line> <line>31</line>
</file> </file>
</directive> </directive>
<directive id="AutoFormat.RemoveEmpty.RemoveNbsp"> <directive id="AutoFormat.RemoveEmpty.RemoveNbsp">
<file name="HTMLPurifier/Injector/RemoveEmpty.php"> <file name="HTMLPurifier/Injector/RemoveEmpty.php">
<line>15</line> <line>46</line>
</file> </file>
</directive> </directive>
<directive id="AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions"> <directive id="AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions">
<file name="HTMLPurifier/Injector/RemoveEmpty.php"> <file name="HTMLPurifier/Injector/RemoveEmpty.php">
<line>16</line> <line>47</line>
</file> </file>
</directive> </directive>
<directive id="Core.AggressivelyFixLt"> <directive id="Core.AggressivelyFixLt">
<file name="HTMLPurifier/Lexer/DOMLex.php"> <file name="HTMLPurifier/Lexer/DOMLex.php">
<line>44</line> <line>54</line>
</file> </file>
</directive> </directive>
<directive id="Core.DirectLexLineNumberSyncInterval"> <directive id="Core.DirectLexLineNumberSyncInterval">
<file name="HTMLPurifier/Lexer/DirectLex.php"> <file name="HTMLPurifier/Lexer/DirectLex.php">
<line>70</line> <line>84</line>
</file> </file>
</directive> </directive>
<directive id="Core.DisableExcludes"> <directive id="Core.DisableExcludes">
<file name="HTMLPurifier/Strategy/FixNesting.php"> <file name="HTMLPurifier/Strategy/FixNesting.php">
<line>57</line> <line>64</line>
</file> </file>
</directive> </directive>
<directive id="Core.EscapeInvalidTags"> <directive id="Core.EscapeInvalidTags">
<file name="HTMLPurifier/Strategy/MakeWellFormed.php"> <file name="HTMLPurifier/Strategy/MakeWellFormed.php">
<line>53</line> <line>66</line>
</file> </file>
<file name="HTMLPurifier/Strategy/RemoveForeignElements.php"> <file name="HTMLPurifier/Strategy/RemoveForeignElements.php">
<line>19</line> <line>26</line>
</file> </file>
</directive> </directive>
<directive id="HTML.AllowedComments"> <directive id="HTML.AllowedComments">
<file name="HTMLPurifier/Strategy/RemoveForeignElements.php"> <file name="HTMLPurifier/Strategy/RemoveForeignElements.php">
<line>24</line> <line>31</line>
</file> </file>
</directive> </directive>
<directive id="HTML.AllowedCommentsRegexp"> <directive id="HTML.AllowedCommentsRegexp">
<file name="HTMLPurifier/Strategy/RemoveForeignElements.php"> <file name="HTMLPurifier/Strategy/RemoveForeignElements.php">
<line>25</line> <line>32</line>
</file> </file>
</directive> </directive>
<directive id="Core.RemoveScriptContents"> <directive id="Core.RemoveScriptContents">
<file name="HTMLPurifier/Strategy/RemoveForeignElements.php"> <file name="HTMLPurifier/Strategy/RemoveForeignElements.php">
<line>28</line> <line>35</line>
</file> </file>
</directive> </directive>
<directive id="Core.HiddenElements"> <directive id="Core.HiddenElements">
<file name="HTMLPurifier/Strategy/RemoveForeignElements.php"> <file name="HTMLPurifier/Strategy/RemoveForeignElements.php">
<line>29</line> <line>36</line>
</file> </file>
</directive> </directive>
<directive id="URI.HostBlacklist"> <directive id="URI.HostBlacklist">
<file name="HTMLPurifier/URIFilter/HostBlacklist.php"> <file name="HTMLPurifier/URIFilter/HostBlacklist.php">
<line>12</line> <line>25</line>
</file> </file>
</directive> </directive>
<directive id="URI.MungeResources"> <directive id="URI.MungeResources">
<file name="HTMLPurifier/URIFilter/Munge.php"> <file name="HTMLPurifier/URIFilter/Munge.php">
<line>14</line> <line>48</line>
</file> </file>
</directive> </directive>
<directive id="URI.MungeSecretKey"> <directive id="URI.MungeSecretKey">
<file name="HTMLPurifier/URIFilter/Munge.php"> <file name="HTMLPurifier/URIFilter/Munge.php">
<line>15</line> <line>49</line>
</file> </file>
</directive> </directive>
<directive id="URI.SafeIframeRegexp"> <directive id="URI.SafeIframeRegexp">
<file name="HTMLPurifier/URIFilter/SafeIframe.php"> <file name="HTMLPurifier/URIFilter/SafeIframe.php">
<line>18</line> <line>35</line>
</file> </file>
</directive> </directive>
</usage> </usage>

View File

@ -57,6 +57,7 @@ require 'HTMLPurifier/Lexer.php';
require 'HTMLPurifier/PercentEncoder.php'; require 'HTMLPurifier/PercentEncoder.php';
require 'HTMLPurifier/PropertyList.php'; require 'HTMLPurifier/PropertyList.php';
require 'HTMLPurifier/PropertyListIterator.php'; require 'HTMLPurifier/PropertyListIterator.php';
require 'HTMLPurifier/Queue.php';
require 'HTMLPurifier/Strategy.php'; require 'HTMLPurifier/Strategy.php';
require 'HTMLPurifier/StringHash.php'; require 'HTMLPurifier/StringHash.php';
require 'HTMLPurifier/StringHashParser.php'; require 'HTMLPurifier/StringHashParser.php';

View File

@ -51,6 +51,7 @@ require_once $__dir . '/HTMLPurifier/Lexer.php';
require_once $__dir . '/HTMLPurifier/PercentEncoder.php'; require_once $__dir . '/HTMLPurifier/PercentEncoder.php';
require_once $__dir . '/HTMLPurifier/PropertyList.php'; require_once $__dir . '/HTMLPurifier/PropertyList.php';
require_once $__dir . '/HTMLPurifier/PropertyListIterator.php'; require_once $__dir . '/HTMLPurifier/PropertyListIterator.php';
require_once $__dir . '/HTMLPurifier/Queue.php';
require_once $__dir . '/HTMLPurifier/Strategy.php'; require_once $__dir . '/HTMLPurifier/Strategy.php';
require_once $__dir . '/HTMLPurifier/StringHash.php'; require_once $__dir . '/HTMLPurifier/StringHash.php';
require_once $__dir . '/HTMLPurifier/StringHashParser.php'; require_once $__dir . '/HTMLPurifier/StringHashParser.php';

View File

@ -92,11 +92,11 @@ class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
protected function tokenizeDOM($node, &$tokens) protected function tokenizeDOM($node, &$tokens)
{ {
$level = 0; $level = 0;
$nodes = array($level => array($node)); $nodes = array($level => new HTMLPurifier_Queue(array($node)));
$closingNodes = array(); $closingNodes = array();
do { do {
while (!empty($nodes[$level])) { while (!$nodes[$level]->isEmpty()) {
$node = array_shift($nodes[$level]); // FIFO $node = $nodes[$level]->shift(); // FIFO
$collect = $level > 0 ? true : false; $collect = $level > 0 ? true : false;
$needEndingTag = $this->createStartNode($node, $tokens, $collect); $needEndingTag = $this->createStartNode($node, $tokens, $collect);
if ($needEndingTag) { if ($needEndingTag) {
@ -104,9 +104,9 @@ class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
} }
if ($node->childNodes && $node->childNodes->length) { if ($node->childNodes && $node->childNodes->length) {
$level++; $level++;
$nodes[$level] = array(); $nodes[$level] = new HTMLPurifier_Queue();
foreach ($node->childNodes as $childNode) { foreach ($node->childNodes as $childNode) {
array_push($nodes[$level], $childNode); $nodes[$level]->push($childNode);
} }
} }
} }

View File

@ -0,0 +1,56 @@
<?php
/**
* A simple array-backed queue, based off of the classic Okasaki
* persistent amortized queue. The basic idea is to maintain two
* stacks: an input stack and an output stack. When the output
* stack runs out, reverse the input stack and use it as the output
* stack.
*
* We don't use the SPL implementation because it's only supported
* on PHP 5.3 and later.
*
* Exercise: Prove that push/pop on this queue take amortized O(1) time.
*
* Exercise: Extend this queue to be a deque, while preserving amortized
* O(1) time. Some care must be taken on rebalancing to avoid quadratic
* behaviour caused by repeatedly shuffling data from the input stack
* to the output stack and back.
*/
class HTMLPurifier_Queue {
private $input;
private $output;
public function __construct($input = array()) {
$this->input = $input;
$this->output = array();
}
/**
* Shifts an element off the front of the queue.
*/
public function shift() {
if (empty($this->output)) {
$this->output = array_reverse($this->input);
$this->input = array();
}
if (empty($this->output)) {
return NULL;
}
return array_pop($this->output);
}
/**
* Pushes an element onto the front of the queue.
*/
public function push($x) {
array_push($this->input, $x);
}
/**
* Checks if it's empty.
*/
public function isEmpty() {
return empty($this->input) && empty($this->output);
}
}