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