189 lines
8.3 KiB
PHP
189 lines
8.3 KiB
PHP
<?php
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/**
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* Removes all unrecognized tags from the list of tokens.
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*
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* This strategy iterates through all the tokens and removes unrecognized
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* tokens. If a token is not recognized but a TagTransform is defined for
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* that element, the element will be transformed accordingly.
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*/
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class HTMLPurifier_Strategy_RemoveForeignElements extends HTMLPurifier_Strategy
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{
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public function execute($tokens, $config, $context) {
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$definition = $config->getHTMLDefinition();
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$generator = new HTMLPurifier_Generator($config, $context);
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$result = array();
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$escape_invalid_tags = $config->get('Core.EscapeInvalidTags');
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$remove_invalid_img = $config->get('Core.RemoveInvalidImg');
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// currently only used to determine if comments should be kept
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$trusted = $config->get('HTML.Trusted');
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$comment_lookup = $config->get('HTML.AllowedComments');
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$comment_regexp = $config->get('HTML.AllowedCommentsRegexp');
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$check_comments = $comment_lookup !== array() || $comment_regexp !== null;
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$remove_script_contents = $config->get('Core.RemoveScriptContents');
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$hidden_elements = $config->get('Core.HiddenElements');
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// remove script contents compatibility
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if ($remove_script_contents === true) {
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$hidden_elements['script'] = true;
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} elseif ($remove_script_contents === false && isset($hidden_elements['script'])) {
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unset($hidden_elements['script']);
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}
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$attr_validator = new HTMLPurifier_AttrValidator();
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// removes tokens until it reaches a closing tag with its value
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$remove_until = false;
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// converts comments into text tokens when this is equal to a tag name
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$textify_comments = false;
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$token = false;
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$context->register('CurrentToken', $token);
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$e = false;
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if ($config->get('Core.CollectErrors')) {
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$e =& $context->get('ErrorCollector');
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}
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foreach($tokens as $token) {
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if ($remove_until) {
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if (empty($token->is_tag) || $token->name !== $remove_until) {
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continue;
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}
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}
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if (!empty( $token->is_tag )) {
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// DEFINITION CALL
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// before any processing, try to transform the element
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if (
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isset($definition->info_tag_transform[$token->name])
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) {
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$original_name = $token->name;
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// there is a transformation for this tag
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// DEFINITION CALL
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$token = $definition->
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info_tag_transform[$token->name]->
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transform($token, $config, $context);
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if ($e) $e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Tag transform', $original_name);
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}
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if (isset($definition->info[$token->name])) {
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// mostly everything's good, but
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// we need to make sure required attributes are in order
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if (
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($token instanceof HTMLPurifier_Token_Start || $token instanceof HTMLPurifier_Token_Empty) &&
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$definition->info[$token->name]->required_attr &&
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($token->name != 'img' || $remove_invalid_img) // ensure config option still works
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) {
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$attr_validator->validateToken($token, $config, $context);
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$ok = true;
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foreach ($definition->info[$token->name]->required_attr as $name) {
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if (!isset($token->attr[$name])) {
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$ok = false;
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break;
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}
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}
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if (!$ok) {
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if ($e) $e->send(E_ERROR, 'Strategy_RemoveForeignElements: Missing required attribute', $name);
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continue;
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}
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$token->armor['ValidateAttributes'] = true;
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}
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if (isset($hidden_elements[$token->name]) && $token instanceof HTMLPurifier_Token_Start) {
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$textify_comments = $token->name;
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} elseif ($token->name === $textify_comments && $token instanceof HTMLPurifier_Token_End) {
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$textify_comments = false;
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}
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} elseif ($escape_invalid_tags) {
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// invalid tag, generate HTML representation and insert in
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if ($e) $e->send(E_WARNING, 'Strategy_RemoveForeignElements: Foreign element to text');
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$token = new HTMLPurifier_Token_Text(
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$generator->generateFromToken($token)
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);
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} else {
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// check if we need to destroy all of the tag's children
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// CAN BE GENERICIZED
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if (isset($hidden_elements[$token->name])) {
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if ($token instanceof HTMLPurifier_Token_Start) {
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$remove_until = $token->name;
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} elseif ($token instanceof HTMLPurifier_Token_Empty) {
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// do nothing: we're still looking
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} else {
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$remove_until = false;
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}
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if ($e) $e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign meta element removed');
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} else {
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if ($e) $e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign element removed');
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}
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continue;
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}
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} elseif ($token instanceof HTMLPurifier_Token_Comment) {
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// textify comments in script tags when they are allowed
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if ($textify_comments !== false) {
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$data = $token->data;
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$token = new HTMLPurifier_Token_Text($data);
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} elseif ($trusted || $check_comments) {
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// always cleanup comments
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$trailing_hyphen = false;
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if ($e) {
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// perform check whether or not there's a trailing hyphen
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if (substr($token->data, -1) == '-') {
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$trailing_hyphen = true;
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}
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}
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$token->data = rtrim($token->data, '-');
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$found_double_hyphen = false;
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while (strpos($token->data, '--') !== false) {
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$found_double_hyphen = true;
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$token->data = str_replace('--', '-', $token->data);
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}
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if ($trusted || !empty($comment_lookup[trim($token->data)]) || ($comment_regexp !== NULL && preg_match($comment_regexp, trim($token->data)))) {
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// OK good
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if ($e) {
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if ($trailing_hyphen) {
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$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Trailing hyphen in comment removed');
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}
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if ($found_double_hyphen) {
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$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Hyphens in comment collapsed');
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}
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}
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} else {
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if ($e) {
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$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
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}
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continue;
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}
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} else {
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// strip comments
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if ($e) $e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
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continue;
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}
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} elseif ($token instanceof HTMLPurifier_Token_Text) {
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} else {
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continue;
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}
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$result[] = $token;
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}
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if ($remove_until && $e) {
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// we removed tokens until the end, throw error
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$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Token removed to end', $remove_until);
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}
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$context->destroy('CurrentToken');
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return $result;
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}
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}
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// vim: et sw=4 sts=4
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