forked from extern/egroupware
8f797be836
- can be used via html class like:
$clean_html = html::purify($html);
- using it now in eTemplate to remove malicious code from html:
a) when displaying "formatted text"
b) when "formatted text" get's input by the user
456 lines
18 KiB
PHP
Executable File
456 lines
18 KiB
PHP
Executable File
<?php
|
|
|
|
/**
|
|
* Takes tokens makes them well-formed (balance end tags, etc.)
|
|
*/
|
|
class HTMLPurifier_Strategy_MakeWellFormed extends HTMLPurifier_Strategy
|
|
{
|
|
|
|
/**
|
|
* Array stream of tokens being processed.
|
|
*/
|
|
protected $tokens;
|
|
|
|
/**
|
|
* Current index in $tokens.
|
|
*/
|
|
protected $t;
|
|
|
|
/**
|
|
* Current nesting of elements.
|
|
*/
|
|
protected $stack;
|
|
|
|
/**
|
|
* Injectors active in this stream processing.
|
|
*/
|
|
protected $injectors;
|
|
|
|
/**
|
|
* Current instance of HTMLPurifier_Config.
|
|
*/
|
|
protected $config;
|
|
|
|
/**
|
|
* Current instance of HTMLPurifier_Context.
|
|
*/
|
|
protected $context;
|
|
|
|
public function execute($tokens, $config, $context) {
|
|
|
|
$definition = $config->getHTMLDefinition();
|
|
|
|
// local variables
|
|
$generator = new HTMLPurifier_Generator($config, $context);
|
|
$escape_invalid_tags = $config->get('Core', 'EscapeInvalidTags');
|
|
$e = $context->get('ErrorCollector', true);
|
|
$t = false; // token index
|
|
$i = false; // injector index
|
|
$token = false; // the current token
|
|
$reprocess = false; // whether or not to reprocess the same token
|
|
$stack = array();
|
|
|
|
// member variables
|
|
$this->stack =& $stack;
|
|
$this->t =& $t;
|
|
$this->tokens =& $tokens;
|
|
$this->config = $config;
|
|
$this->context = $context;
|
|
|
|
// context variables
|
|
$context->register('CurrentNesting', $stack);
|
|
$context->register('InputIndex', $t);
|
|
$context->register('InputTokens', $tokens);
|
|
$context->register('CurrentToken', $token);
|
|
|
|
// -- begin INJECTOR --
|
|
|
|
$this->injectors = array();
|
|
|
|
$injectors = $config->getBatch('AutoFormat');
|
|
$def_injectors = $definition->info_injector;
|
|
$custom_injectors = $injectors['Custom'];
|
|
unset($injectors['Custom']); // special case
|
|
foreach ($injectors as $injector => $b) {
|
|
$injector = "HTMLPurifier_Injector_$injector";
|
|
if (!$b) continue;
|
|
$this->injectors[] = new $injector;
|
|
}
|
|
foreach ($def_injectors as $injector) {
|
|
// assumed to be objects
|
|
$this->injectors[] = $injector;
|
|
}
|
|
foreach ($custom_injectors as $injector) {
|
|
if (is_string($injector)) {
|
|
$injector = "HTMLPurifier_Injector_$injector";
|
|
$injector = new $injector;
|
|
}
|
|
$this->injectors[] = $injector;
|
|
}
|
|
|
|
// give the injectors references to the definition and context
|
|
// variables for performance reasons
|
|
foreach ($this->injectors as $ix => $injector) {
|
|
$error = $injector->prepare($config, $context);
|
|
if (!$error) continue;
|
|
array_splice($this->injectors, $ix, 1); // rm the injector
|
|
trigger_error("Cannot enable {$injector->name} injector because $error is not allowed", E_USER_WARNING);
|
|
}
|
|
|
|
// -- end INJECTOR --
|
|
|
|
// a note on punting:
|
|
// In order to reduce code duplication, whenever some code needs
|
|
// to make HTML changes in order to make things "correct", the
|
|
// new HTML gets sent through the purifier, regardless of its
|
|
// status. This means that if we add a start token, because it
|
|
// was totally necessary, we don't have to update nesting; we just
|
|
// punt ($reprocess = true; continue;) and it does that for us.
|
|
|
|
// isset is in loop because $tokens size changes during loop exec
|
|
for (
|
|
$t = 0;
|
|
$t == 0 || isset($tokens[$t - 1]);
|
|
// only increment if we don't need to reprocess
|
|
$reprocess ? $reprocess = false : $t++
|
|
) {
|
|
|
|
// check for a rewind
|
|
if (is_int($i) && $i >= 0) {
|
|
// possibility: disable rewinding if the current token has a
|
|
// rewind set on it already. This would offer protection from
|
|
// infinite loop, but might hinder some advanced rewinding.
|
|
$rewind_to = $this->injectors[$i]->getRewind();
|
|
if (is_int($rewind_to) && $rewind_to < $t) {
|
|
if ($rewind_to < 0) $rewind_to = 0;
|
|
while ($t > $rewind_to) {
|
|
$t--;
|
|
$prev = $tokens[$t];
|
|
// indicate that other injectors should not process this token,
|
|
// but we need to reprocess it
|
|
unset($prev->skip[$i]);
|
|
$prev->rewind = $i;
|
|
if ($prev instanceof HTMLPurifier_Token_Start) array_pop($this->stack);
|
|
elseif ($prev instanceof HTMLPurifier_Token_End) $this->stack[] = $prev->start;
|
|
}
|
|
}
|
|
$i = false;
|
|
}
|
|
|
|
// handle case of document end
|
|
if (!isset($tokens[$t])) {
|
|
// kill processing if stack is empty
|
|
if (empty($this->stack)) break;
|
|
|
|
// peek
|
|
$top_nesting = array_pop($this->stack);
|
|
$this->stack[] = $top_nesting;
|
|
|
|
// send error
|
|
if ($e && !isset($top_nesting->armor['MakeWellFormed_TagClosedError'])) {
|
|
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag closed by document end', $top_nesting);
|
|
}
|
|
|
|
// append, don't splice, since this is the end
|
|
$tokens[] = new HTMLPurifier_Token_End($top_nesting->name);
|
|
|
|
// punt!
|
|
$reprocess = true;
|
|
continue;
|
|
}
|
|
|
|
$token = $tokens[$t];
|
|
|
|
//echo '<br>'; printTokens($tokens, $t); printTokens($this->stack);
|
|
|
|
// quick-check: if it's not a tag, no need to process
|
|
if (empty($token->is_tag)) {
|
|
if ($token instanceof HTMLPurifier_Token_Text) {
|
|
foreach ($this->injectors as $i => $injector) {
|
|
if (isset($token->skip[$i])) continue;
|
|
if ($token->rewind !== null && $token->rewind !== $i) continue;
|
|
$injector->handleText($token);
|
|
$this->processToken($token, $i);
|
|
$reprocess = true;
|
|
break;
|
|
}
|
|
}
|
|
// another possibility is a comment
|
|
continue;
|
|
}
|
|
|
|
if (isset($definition->info[$token->name])) {
|
|
$type = $definition->info[$token->name]->child->type;
|
|
} else {
|
|
$type = false; // Type is unknown, treat accordingly
|
|
}
|
|
|
|
// quick tag checks: anything that's *not* an end tag
|
|
$ok = false;
|
|
if ($type === 'empty' && $token instanceof HTMLPurifier_Token_Start) {
|
|
// claims to be a start tag but is empty
|
|
$token = new HTMLPurifier_Token_Empty($token->name, $token->attr);
|
|
$ok = true;
|
|
} elseif ($type && $type !== 'empty' && $token instanceof HTMLPurifier_Token_Empty) {
|
|
// claims to be empty but really is a start tag
|
|
$this->swap(new HTMLPurifier_Token_End($token->name));
|
|
$this->insertBefore(new HTMLPurifier_Token_Start($token->name, $token->attr));
|
|
// punt (since we had to modify the input stream in a non-trivial way)
|
|
$reprocess = true;
|
|
continue;
|
|
} elseif ($token instanceof HTMLPurifier_Token_Empty) {
|
|
// real empty token
|
|
$ok = true;
|
|
} elseif ($token instanceof HTMLPurifier_Token_Start) {
|
|
// start tag
|
|
|
|
// ...unless they also have to close their parent
|
|
if (!empty($this->stack)) {
|
|
|
|
$parent = array_pop($this->stack);
|
|
$this->stack[] = $parent;
|
|
|
|
if (isset($definition->info[$parent->name])) {
|
|
$elements = $definition->info[$parent->name]->child->getAllowedElements($config);
|
|
$autoclose = !isset($elements[$token->name]);
|
|
} else {
|
|
$autoclose = false;
|
|
}
|
|
|
|
$carryover = false;
|
|
if ($autoclose && $definition->info[$parent->name]->formatting) {
|
|
$carryover = true;
|
|
}
|
|
|
|
if ($autoclose) {
|
|
// errors need to be updated
|
|
$new_token = new HTMLPurifier_Token_End($parent->name);
|
|
$new_token->start = $parent;
|
|
if ($carryover) {
|
|
$element = clone $parent;
|
|
$element->armor['MakeWellFormed_TagClosedError'] = true;
|
|
$element->carryover = true;
|
|
$this->processToken(array($new_token, $token, $element));
|
|
} else {
|
|
$this->insertBefore($new_token);
|
|
}
|
|
if ($e && !isset($parent->armor['MakeWellFormed_TagClosedError'])) {
|
|
if (!$carryover) {
|
|
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag auto closed', $parent);
|
|
} else {
|
|
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag carryover', $parent);
|
|
}
|
|
}
|
|
$reprocess = true;
|
|
continue;
|
|
}
|
|
|
|
}
|
|
$ok = true;
|
|
}
|
|
|
|
if ($ok) {
|
|
foreach ($this->injectors as $i => $injector) {
|
|
if (isset($token->skip[$i])) continue;
|
|
if ($token->rewind !== null && $token->rewind !== $i) continue;
|
|
$injector->handleElement($token);
|
|
$this->processToken($token, $i);
|
|
$reprocess = true;
|
|
break;
|
|
}
|
|
if (!$reprocess) {
|
|
// ah, nothing interesting happened; do normal processing
|
|
$this->swap($token);
|
|
if ($token instanceof HTMLPurifier_Token_Start) {
|
|
$this->stack[] = $token;
|
|
} elseif ($token instanceof HTMLPurifier_Token_End) {
|
|
throw new HTMLPurifier_Exception('Improper handling of end tag in start code; possible error in MakeWellFormed');
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// sanity check: we should be dealing with a closing tag
|
|
if (!$token instanceof HTMLPurifier_Token_End) {
|
|
throw new HTMLPurifier_Exception('Unaccounted for tag token in input stream, bug in HTML Purifier');
|
|
}
|
|
|
|
// make sure that we have something open
|
|
if (empty($this->stack)) {
|
|
if ($escape_invalid_tags) {
|
|
if ($e) $e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag to text');
|
|
$this->swap(new HTMLPurifier_Token_Text(
|
|
$generator->generateFromToken($token)
|
|
));
|
|
} else {
|
|
$this->remove();
|
|
if ($e) $e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag removed');
|
|
}
|
|
$reprocess = true;
|
|
continue;
|
|
}
|
|
|
|
// first, check for the simplest case: everything closes neatly.
|
|
// Eventually, everything passes through here; if there are problems
|
|
// we modify the input stream accordingly and then punt, so that
|
|
// the tokens get processed again.
|
|
$current_parent = array_pop($this->stack);
|
|
if ($current_parent->name == $token->name) {
|
|
$token->start = $current_parent;
|
|
foreach ($this->injectors as $i => $injector) {
|
|
if (isset($token->skip[$i])) continue;
|
|
if ($token->rewind !== null && $token->rewind !== $i) continue;
|
|
$injector->handleEnd($token);
|
|
$this->processToken($token, $i);
|
|
$this->stack[] = $current_parent;
|
|
$reprocess = true;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// okay, so we're trying to close the wrong tag
|
|
|
|
// undo the pop previous pop
|
|
$this->stack[] = $current_parent;
|
|
|
|
// scroll back the entire nest, trying to find our tag.
|
|
// (feature could be to specify how far you'd like to go)
|
|
$size = count($this->stack);
|
|
// -2 because -1 is the last element, but we already checked that
|
|
$skipped_tags = false;
|
|
for ($j = $size - 2; $j >= 0; $j--) {
|
|
if ($this->stack[$j]->name == $token->name) {
|
|
$skipped_tags = array_slice($this->stack, $j);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// we didn't find the tag, so remove
|
|
if ($skipped_tags === false) {
|
|
if ($escape_invalid_tags) {
|
|
$this->swap(new HTMLPurifier_Token_Text(
|
|
$generator->generateFromToken($token)
|
|
));
|
|
if ($e) $e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag to text');
|
|
} else {
|
|
$this->remove();
|
|
if ($e) $e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag removed');
|
|
}
|
|
$reprocess = true;
|
|
continue;
|
|
}
|
|
|
|
// do errors, in REVERSE $j order: a,b,c with </a></b></c>
|
|
$c = count($skipped_tags);
|
|
if ($e) {
|
|
for ($j = $c - 1; $j > 0; $j--) {
|
|
// notice we exclude $j == 0, i.e. the current ending tag, from
|
|
// the errors...
|
|
if (!isset($skipped_tags[$j]->armor['MakeWellFormed_TagClosedError'])) {
|
|
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag closed by element end', $skipped_tags[$j]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// insert tags, in FORWARD $j order: c,b,a with </a></b></c>
|
|
$replace = array($token);
|
|
for ($j = 1; $j < $c; $j++) {
|
|
// ...as well as from the insertions
|
|
$new_token = new HTMLPurifier_Token_End($skipped_tags[$j]->name);
|
|
$new_token->start = $skipped_tags[$j];
|
|
array_unshift($replace, $new_token);
|
|
if (isset($definition->info[$new_token->name]) && $definition->info[$new_token->name]->formatting) {
|
|
$element = clone $skipped_tags[$j];
|
|
$element->carryover = true;
|
|
$element->armor['MakeWellFormed_TagClosedError'] = true;
|
|
$replace[] = $element;
|
|
}
|
|
}
|
|
$this->processToken($replace);
|
|
$reprocess = true;
|
|
continue;
|
|
}
|
|
|
|
$context->destroy('CurrentNesting');
|
|
$context->destroy('InputTokens');
|
|
$context->destroy('InputIndex');
|
|
$context->destroy('CurrentToken');
|
|
|
|
unset($this->injectors, $this->stack, $this->tokens, $this->t);
|
|
return $tokens;
|
|
}
|
|
|
|
/**
|
|
* Processes arbitrary token values for complicated substitution patterns.
|
|
* In general:
|
|
*
|
|
* If $token is an array, it is a list of tokens to substitute for the
|
|
* current token. These tokens then get individually processed. If there
|
|
* is a leading integer in the list, that integer determines how many
|
|
* tokens from the stream should be removed.
|
|
*
|
|
* If $token is a regular token, it is swapped with the current token.
|
|
*
|
|
* If $token is false, the current token is deleted.
|
|
*
|
|
* If $token is an integer, that number of tokens (with the first token
|
|
* being the current one) will be deleted.
|
|
*
|
|
* @param $token Token substitution value
|
|
* @param $injector Injector that performed the substitution; default is if
|
|
* this is not an injector related operation.
|
|
*/
|
|
protected function processToken($token, $injector = -1) {
|
|
|
|
// normalize forms of token
|
|
if (is_object($token)) $token = array(1, $token);
|
|
if (is_int($token)) $token = array($token);
|
|
if ($token === false) $token = array(1);
|
|
if (!is_array($token)) throw new HTMLPurifier_Exception('Invalid token type from injector');
|
|
if (!is_int($token[0])) array_unshift($token, 1);
|
|
if ($token[0] === 0) throw new HTMLPurifier_Exception('Deleting zero tokens is not valid');
|
|
|
|
// $token is now an array with the following form:
|
|
// array(number nodes to delete, new node 1, new node 2, ...)
|
|
|
|
$delete = array_shift($token);
|
|
$old = array_splice($this->tokens, $this->t, $delete, $token);
|
|
|
|
if ($injector > -1) {
|
|
// determine appropriate skips
|
|
$oldskip = isset($old[0]) ? $old[0]->skip : array();
|
|
foreach ($token as $object) {
|
|
$object->skip = $oldskip;
|
|
$object->skip[$injector] = true;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Inserts a token before the current token. Cursor now points to this token
|
|
*/
|
|
private function insertBefore($token) {
|
|
array_splice($this->tokens, $this->t, 0, array($token));
|
|
}
|
|
|
|
/**
|
|
* Removes current token. Cursor now points to new token occupying previously
|
|
* occupied space.
|
|
*/
|
|
private function remove() {
|
|
array_splice($this->tokens, $this->t, 1);
|
|
}
|
|
|
|
/**
|
|
* Swap current token with new token. Cursor points to new token (no change).
|
|
*/
|
|
private function swap($token) {
|
|
$this->tokens[$this->t] = $token;
|
|
}
|
|
|
|
}
|
|
|
|
// vim: et sw=4 sts=4
|