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-rw-r--r--library/HTMLPurifier/AttrDef/HTML/ID.php70
1 files changed, 70 insertions, 0 deletions
diff --git a/library/HTMLPurifier/AttrDef/HTML/ID.php b/library/HTMLPurifier/AttrDef/HTML/ID.php
new file mode 100644
index 000000000..81d03762d
--- /dev/null
+++ b/library/HTMLPurifier/AttrDef/HTML/ID.php
@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * Validates the HTML attribute ID.
+ * @warning Even though this is the id processor, it
+ * will ignore the directive Attr:IDBlacklist, since it will only
+ * go according to the ID accumulator. Since the accumulator is
+ * automatically generated, it will have already absorbed the
+ * blacklist. If you're hacking around, make sure you use load()!
+ */
+
+class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
+{
+
+ // ref functionality disabled, since we also have to verify
+ // whether or not the ID it refers to exists
+
+ public function validate($id, $config, $context) {
+
+ if (!$config->get('Attr.EnableID')) return false;
+
+ $id = trim($id); // trim it first
+
+ if ($id === '') return false;
+
+ $prefix = $config->get('Attr.IDPrefix');
+ if ($prefix !== '') {
+ $prefix .= $config->get('Attr.IDPrefixLocal');
+ // prevent re-appending the prefix
+ if (strpos($id, $prefix) !== 0) $id = $prefix . $id;
+ } elseif ($config->get('Attr.IDPrefixLocal') !== '') {
+ trigger_error('%Attr.IDPrefixLocal cannot be used unless '.
+ '%Attr.IDPrefix is set', E_USER_WARNING);
+ }
+
+ //if (!$this->ref) {
+ $id_accumulator =& $context->get('IDAccumulator');
+ if (isset($id_accumulator->ids[$id])) return false;
+ //}
+
+ // we purposely avoid using regex, hopefully this is faster
+
+ if (ctype_alpha($id)) {
+ $result = true;
+ } else {
+ if (!ctype_alpha(@$id[0])) return false;
+ $trim = trim( // primitive style of regexps, I suppose
+ $id,
+ 'A..Za..z0..9:-._'
+ );
+ $result = ($trim === '');
+ }
+
+ $regexp = $config->get('Attr.IDBlacklistRegexp');
+ if ($regexp && preg_match($regexp, $id)) {
+ return false;
+ }
+
+ if (/*!$this->ref && */$result) $id_accumulator->add($id);
+
+ // if no change was made to the ID, return the result
+ // else, return the new id if stripping whitespace made it
+ // valid, or return false.
+ return $result ? $id : false;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4