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<?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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/** |
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* @param HTMLPurifier_Token[] $tokens |
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* @param HTMLPurifier_Config $config |
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* @param HTMLPurifier_Context $context |
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* @return array|HTMLPurifier_Token[] |
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*/ |
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public function execute($tokens, $config, $context) |
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{ |
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$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 (isset($definition->info_tag_transform[$token->name])) { |
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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]->transform($token, $config, $context); |
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if ($e) { |
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$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Tag transform', $original_name); |
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} |
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} |
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if (isset($definition->info[$token->name])) { |
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// mostly everything's good, but |
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// we need to make sure required attributes are in order |
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if (($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) { |
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$e->send( |
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E_ERROR, |
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'Strategy_RemoveForeignElements: Missing required attribute', |
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$name |
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); |
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} |
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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) { |
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$e->send(E_WARNING, 'Strategy_RemoveForeignElements: Foreign element to text'); |
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} |
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$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) { |
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$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign meta element removed'); |
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} |
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} else { |
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if ($e) { |
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$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign element removed'); |
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} |
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} |
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continue; |
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} |
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} elseif ($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)]) || |
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($comment_regexp !== null && preg_match($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( |
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E_NOTICE, |
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'Strategy_RemoveForeignElements: Trailing hyphen in comment removed' |
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); |
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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 ($e) { |
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$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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} 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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