aboutsummaryrefslogtreecommitdiffstats
path: root/library/HTMLPurifier/Strategy
diff options
context:
space:
mode:
authorMike Macgirvin <mike@macgirvin.com>2010-09-08 20:14:17 -0700
committerMike Macgirvin <mike@macgirvin.com>2010-09-08 20:14:17 -0700
commitffb1997902facb36b78a7cfa522f41f2b3d71cda (patch)
treee9fe47acf26c5fd2c742677f2610b60d3008eb26 /library/HTMLPurifier/Strategy
parentb49858b038a0a05bbe7685929e88071d0e125538 (diff)
downloadvolse-hubzilla-ffb1997902facb36b78a7cfa522f41f2b3d71cda.tar.gz
volse-hubzilla-ffb1997902facb36b78a7cfa522f41f2b3d71cda.tar.bz2
volse-hubzilla-ffb1997902facb36b78a7cfa522f41f2b3d71cda.zip
mistpark 2.0 infrasturcture lands
Diffstat (limited to 'library/HTMLPurifier/Strategy')
-rw-r--r--library/HTMLPurifier/Strategy/Composite.php25
-rw-r--r--library/HTMLPurifier/Strategy/Core.php18
-rw-r--r--library/HTMLPurifier/Strategy/FixNesting.php328
-rw-r--r--library/HTMLPurifier/Strategy/MakeWellFormed.php475
-rw-r--r--library/HTMLPurifier/Strategy/RemoveForeignElements.php171
-rw-r--r--library/HTMLPurifier/Strategy/ValidateAttributes.php39
6 files changed, 1056 insertions, 0 deletions
diff --git a/library/HTMLPurifier/Strategy/Composite.php b/library/HTMLPurifier/Strategy/Composite.php
new file mode 100644
index 000000000..816490b79
--- /dev/null
+++ b/library/HTMLPurifier/Strategy/Composite.php
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * Composite strategy that runs multiple strategies on tokens.
+ */
+abstract class HTMLPurifier_Strategy_Composite extends HTMLPurifier_Strategy
+{
+
+ /**
+ * List of strategies to run tokens through.
+ */
+ protected $strategies = array();
+
+ abstract public function __construct();
+
+ public function execute($tokens, $config, $context) {
+ foreach ($this->strategies as $strategy) {
+ $tokens = $strategy->execute($tokens, $config, $context);
+ }
+ return $tokens;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/Strategy/Core.php b/library/HTMLPurifier/Strategy/Core.php
new file mode 100644
index 000000000..d90e15860
--- /dev/null
+++ b/library/HTMLPurifier/Strategy/Core.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * Core strategy composed of the big four strategies.
+ */
+class HTMLPurifier_Strategy_Core extends HTMLPurifier_Strategy_Composite
+{
+
+ public function __construct() {
+ $this->strategies[] = new HTMLPurifier_Strategy_RemoveForeignElements();
+ $this->strategies[] = new HTMLPurifier_Strategy_MakeWellFormed();
+ $this->strategies[] = new HTMLPurifier_Strategy_FixNesting();
+ $this->strategies[] = new HTMLPurifier_Strategy_ValidateAttributes();
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/Strategy/FixNesting.php b/library/HTMLPurifier/Strategy/FixNesting.php
new file mode 100644
index 000000000..f81802391
--- /dev/null
+++ b/library/HTMLPurifier/Strategy/FixNesting.php
@@ -0,0 +1,328 @@
+<?php
+
+/**
+ * Takes a well formed list of tokens and fixes their nesting.
+ *
+ * HTML elements dictate which elements are allowed to be their children,
+ * for example, you can't have a p tag in a span tag. Other elements have
+ * much more rigorous definitions: tables, for instance, require a specific
+ * order for their elements. There are also constraints not expressible by
+ * document type definitions, such as the chameleon nature of ins/del
+ * tags and global child exclusions.
+ *
+ * The first major objective of this strategy is to iterate through all the
+ * nodes (not tokens) of the list of tokens and determine whether or not
+ * their children conform to the element's definition. If they do not, the
+ * child definition may optionally supply an amended list of elements that
+ * is valid or require that the entire node be deleted (and the previous
+ * node rescanned).
+ *
+ * The second objective is to ensure that explicitly excluded elements of
+ * an element do not appear in its children. Code that accomplishes this
+ * task is pervasive through the strategy, though the two are distinct tasks
+ * and could, theoretically, be seperated (although it's not recommended).
+ *
+ * @note Whether or not unrecognized children are silently dropped or
+ * translated into text depends on the child definitions.
+ *
+ * @todo Enable nodes to be bubbled out of the structure.
+ */
+
+class HTMLPurifier_Strategy_FixNesting extends HTMLPurifier_Strategy
+{
+
+ public function execute($tokens, $config, $context) {
+ //####################################################################//
+ // Pre-processing
+
+ // get a copy of the HTML definition
+ $definition = $config->getHTMLDefinition();
+
+ // insert implicit "parent" node, will be removed at end.
+ // DEFINITION CALL
+ $parent_name = $definition->info_parent;
+ array_unshift($tokens, new HTMLPurifier_Token_Start($parent_name));
+ $tokens[] = new HTMLPurifier_Token_End($parent_name);
+
+ // setup the context variable 'IsInline', for chameleon processing
+ // is 'false' when we are not inline, 'true' when it must always
+ // be inline, and an integer when it is inline for a certain
+ // branch of the document tree
+ $is_inline = $definition->info_parent_def->descendants_are_inline;
+ $context->register('IsInline', $is_inline);
+
+ // setup error collector
+ $e =& $context->get('ErrorCollector', true);
+
+ //####################################################################//
+ // Loop initialization
+
+ // stack that contains the indexes of all parents,
+ // $stack[count($stack)-1] being the current parent
+ $stack = array();
+
+ // stack that contains all elements that are excluded
+ // it is organized by parent elements, similar to $stack,
+ // but it is only populated when an element with exclusions is
+ // processed, i.e. there won't be empty exclusions.
+ $exclude_stack = array();
+
+ // variable that contains the start token while we are processing
+ // nodes. This enables error reporting to do its job
+ $start_token = false;
+ $context->register('CurrentToken', $start_token);
+
+ //####################################################################//
+ // Loop
+
+ // iterate through all start nodes. Determining the start node
+ // is complicated so it has been omitted from the loop construct
+ for ($i = 0, $size = count($tokens) ; $i < $size; ) {
+
+ //################################################################//
+ // Gather information on children
+
+ // child token accumulator
+ $child_tokens = array();
+
+ // scroll to the end of this node, report number, and collect
+ // all children
+ for ($j = $i, $depth = 0; ; $j++) {
+ if ($tokens[$j] instanceof HTMLPurifier_Token_Start) {
+ $depth++;
+ // skip token assignment on first iteration, this is the
+ // token we currently are on
+ if ($depth == 1) continue;
+ } elseif ($tokens[$j] instanceof HTMLPurifier_Token_End) {
+ $depth--;
+ // skip token assignment on last iteration, this is the
+ // end token of the token we're currently on
+ if ($depth == 0) break;
+ }
+ $child_tokens[] = $tokens[$j];
+ }
+
+ // $i is index of start token
+ // $j is index of end token
+
+ $start_token = $tokens[$i]; // to make token available via CurrentToken
+
+ //################################################################//
+ // Gather information on parent
+
+ // calculate parent information
+ if ($count = count($stack)) {
+ $parent_index = $stack[$count-1];
+ $parent_name = $tokens[$parent_index]->name;
+ if ($parent_index == 0) {
+ $parent_def = $definition->info_parent_def;
+ } else {
+ $parent_def = $definition->info[$parent_name];
+ }
+ } else {
+ // processing as if the parent were the "root" node
+ // unknown info, it won't be used anyway, in the future,
+ // we may want to enforce one element only (this is
+ // necessary for HTML Purifier to clean entire documents
+ $parent_index = $parent_name = $parent_def = null;
+ }
+
+ // calculate context
+ if ($is_inline === false) {
+ // check if conditions make it inline
+ if (!empty($parent_def) && $parent_def->descendants_are_inline) {
+ $is_inline = $count - 1;
+ }
+ } else {
+ // check if we're out of inline
+ if ($count === $is_inline) {
+ $is_inline = false;
+ }
+ }
+
+ //################################################################//
+ // Determine whether element is explicitly excluded SGML-style
+
+ // determine whether or not element is excluded by checking all
+ // parent exclusions. The array should not be very large, two
+ // elements at most.
+ $excluded = false;
+ if (!empty($exclude_stack)) {
+ foreach ($exclude_stack as $lookup) {
+ if (isset($lookup[$tokens[$i]->name])) {
+ $excluded = true;
+ // no need to continue processing
+ break;
+ }
+ }
+ }
+
+ //################################################################//
+ // Perform child validation
+
+ if ($excluded) {
+ // there is an exclusion, remove the entire node
+ $result = false;
+ $excludes = array(); // not used, but good to initialize anyway
+ } else {
+ // DEFINITION CALL
+ if ($i === 0) {
+ // special processing for the first node
+ $def = $definition->info_parent_def;
+ } else {
+ $def = $definition->info[$tokens[$i]->name];
+
+ }
+
+ if (!empty($def->child)) {
+ // have DTD child def validate children
+ $result = $def->child->validateChildren(
+ $child_tokens, $config, $context);
+ } else {
+ // weird, no child definition, get rid of everything
+ $result = false;
+ }
+
+ // determine whether or not this element has any exclusions
+ $excludes = $def->excludes;
+ }
+
+ // $result is now a bool or array
+
+ //################################################################//
+ // Process result by interpreting $result
+
+ if ($result === true || $child_tokens === $result) {
+ // leave the node as is
+
+ // register start token as a parental node start
+ $stack[] = $i;
+
+ // register exclusions if there are any
+ if (!empty($excludes)) $exclude_stack[] = $excludes;
+
+ // move cursor to next possible start node
+ $i++;
+
+ } elseif($result === false) {
+ // remove entire node
+
+ if ($e) {
+ if ($excluded) {
+ $e->send(E_ERROR, 'Strategy_FixNesting: Node excluded');
+ } else {
+ $e->send(E_ERROR, 'Strategy_FixNesting: Node removed');
+ }
+ }
+
+ // calculate length of inner tokens and current tokens
+ $length = $j - $i + 1;
+
+ // perform removal
+ array_splice($tokens, $i, $length);
+
+ // update size
+ $size -= $length;
+
+ // there is no start token to register,
+ // current node is now the next possible start node
+ // unless it turns out that we need to do a double-check
+
+ // this is a rought heuristic that covers 100% of HTML's
+ // cases and 99% of all other cases. A child definition
+ // that would be tricked by this would be something like:
+ // ( | a b c) where it's all or nothing. Fortunately,
+ // our current implementation claims that that case would
+ // not allow empty, even if it did
+ if (!$parent_def->child->allow_empty) {
+ // we need to do a double-check
+ $i = $parent_index;
+ array_pop($stack);
+ }
+
+ // PROJECTED OPTIMIZATION: Process all children elements before
+ // reprocessing parent node.
+
+ } else {
+ // replace node with $result
+
+ // calculate length of inner tokens
+ $length = $j - $i - 1;
+
+ if ($e) {
+ if (empty($result) && $length) {
+ $e->send(E_ERROR, 'Strategy_FixNesting: Node contents removed');
+ } else {
+ $e->send(E_WARNING, 'Strategy_FixNesting: Node reorganized');
+ }
+ }
+
+ // perform replacement
+ array_splice($tokens, $i + 1, $length, $result);
+
+ // update size
+ $size -= $length;
+ $size += count($result);
+
+ // register start token as a parental node start
+ $stack[] = $i;
+
+ // register exclusions if there are any
+ if (!empty($excludes)) $exclude_stack[] = $excludes;
+
+ // move cursor to next possible start node
+ $i++;
+
+ }
+
+ //################################################################//
+ // Scroll to next start node
+
+ // We assume, at this point, that $i is the index of the token
+ // that is the first possible new start point for a node.
+
+ // Test if the token indeed is a start tag, if not, move forward
+ // and test again.
+ $size = count($tokens);
+ while ($i < $size and !$tokens[$i] instanceof HTMLPurifier_Token_Start) {
+ if ($tokens[$i] instanceof HTMLPurifier_Token_End) {
+ // pop a token index off the stack if we ended a node
+ array_pop($stack);
+ // pop an exclusion lookup off exclusion stack if
+ // we ended node and that node had exclusions
+ if ($i == 0 || $i == $size - 1) {
+ // use specialized var if it's the super-parent
+ $s_excludes = $definition->info_parent_def->excludes;
+ } else {
+ $s_excludes = $definition->info[$tokens[$i]->name]->excludes;
+ }
+ if ($s_excludes) {
+ array_pop($exclude_stack);
+ }
+ }
+ $i++;
+ }
+
+ }
+
+ //####################################################################//
+ // Post-processing
+
+ // remove implicit parent tokens at the beginning and end
+ array_shift($tokens);
+ array_pop($tokens);
+
+ // remove context variables
+ $context->destroy('IsInline');
+ $context->destroy('CurrentToken');
+
+ //####################################################################//
+ // Return
+
+ return $tokens;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/Strategy/MakeWellFormed.php b/library/HTMLPurifier/Strategy/MakeWellFormed.php
new file mode 100644
index 000000000..c73658400
--- /dev/null
+++ b/library/HTMLPurifier/Strategy/MakeWellFormed.php
@@ -0,0 +1,475 @@
+<?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 => $b) {
+ // XXX: Fix with a legitimate lookup table of enabled filters
+ if (strpos($injector, '.') !== false) continue;
+ $injector = "HTMLPurifier_Injector_$injector";
+ if (!$b) continue;
+ $this->injectors[] = new $injector;
+ }
+ foreach ($def_injectors as $injector) {
+ // assumed to be objects
+ $this->injectors[] = $injector;
+ }
+ foreach ($custom_injectors as $injector) {
+ if (!$injector) continue;
+ 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);
+ //flush();
+
+ // 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 {
+ $autoclose = false;
+ }
+
+ if ($autoclose && $definition->info[$token->name]->wrap) {
+ // Check if an element can be wrapped by another
+ // element to make it valid in a context (for
+ // example, <ul><ul> needs a <li> in between)
+ $wrapname = $definition->info[$token->name]->wrap;
+ $wrapdef = $definition->info[$wrapname];
+ $elements = $wrapdef->child->getAllowedElements($config);
+ $parent_elements = $definition->info[$parent->name]->child->getAllowedElements($config);
+ if (isset($elements[$token->name]) && isset($parent_elements[$wrapname])) {
+ $newtoken = new HTMLPurifier_Token_Start($wrapname);
+ $this->insertBefore($newtoken);
+ $reprocess = true;
+ continue;
+ }
+ }
+
+ $carryover = false;
+ if ($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] = $token;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/Strategy/RemoveForeignElements.php b/library/HTMLPurifier/Strategy/RemoveForeignElements.php
new file mode 100644
index 000000000..cf3a33e40
--- /dev/null
+++ b/library/HTMLPurifier/Strategy/RemoveForeignElements.php
@@ -0,0 +1,171 @@
+<?php
+
+/**
+ * Removes all unrecognized tags from the list of tokens.
+ *
+ * This strategy iterates through all the tokens and removes unrecognized
+ * tokens. If a token is not recognized but a TagTransform is defined for
+ * that element, the element will be transformed accordingly.
+ */
+
+class HTMLPurifier_Strategy_RemoveForeignElements extends HTMLPurifier_Strategy
+{
+
+ public function execute($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');
+
+ $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 ($trusted) {
+ // keep, but perform comment cleaning
+ if ($e) {
+ // perform check whether or not there's a trailing hyphen
+ if (substr($token->data, -1) == '-') {
+ $e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Trailing hyphen in comment removed');
+ }
+ }
+ $token->data = rtrim($token->data, '-');
+ $found_double_hyphen = false;
+ while (strpos($token->data, '--') !== false) {
+ if ($e && !$found_double_hyphen) {
+ $e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Hyphens in comment collapsed');
+ }
+ $found_double_hyphen = true; // prevent double-erroring
+ $token->data = str_replace('--', '-', $token->data);
+ }
+ } else {
+ // strip comments
+ if ($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 $result;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/Strategy/ValidateAttributes.php b/library/HTMLPurifier/Strategy/ValidateAttributes.php
new file mode 100644
index 000000000..c3328a9d4
--- /dev/null
+++ b/library/HTMLPurifier/Strategy/ValidateAttributes.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * Validate all attributes in the tokens.
+ */
+
+class HTMLPurifier_Strategy_ValidateAttributes extends HTMLPurifier_Strategy
+{
+
+ public function execute($tokens, $config, $context) {
+
+ // setup validator
+ $validator = new HTMLPurifier_AttrValidator();
+
+ $token = false;
+ $context->register('CurrentToken', $token);
+
+ foreach ($tokens as $key => $token) {
+
+ // only process tokens that have attributes,
+ // namely start and empty tags
+ if (!$token instanceof HTMLPurifier_Token_Start && !$token instanceof HTMLPurifier_Token_Empty) continue;
+
+ // skip tokens that are armored
+ if (!empty($token->armor['ValidateAttributes'])) continue;
+
+ // note that we have no facilities here for removing tokens
+ $validator->validateToken($token, $config, $context);
+
+ $tokens[$key] = $token; // for PHP 4
+ }
+ $context->destroy('CurrentToken');
+
+ return $tokens;
+ }
+
+}
+
+// vim: et sw=4 sts=4