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-rw-r--r--library/HTMLPurifier/AttrDef/CSS/URI.php52
1 files changed, 52 insertions, 0 deletions
diff --git a/library/HTMLPurifier/AttrDef/CSS/URI.php b/library/HTMLPurifier/AttrDef/CSS/URI.php
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+++ b/library/HTMLPurifier/AttrDef/CSS/URI.php
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+<?php
+
+/**
+ * Validates a URI in CSS syntax, which uses url('http://example.com')
+ * @note While theoretically speaking a URI in a CSS document could
+ * be non-embedded, as of CSS2 there is no such usage so we're
+ * generalizing it. This may need to be changed in the future.
+ * @warning Since HTMLPurifier_AttrDef_CSS blindly uses semicolons as
+ * the separator, you cannot put a literal semicolon in
+ * in the URI. Try percent encoding it, in that case.
+ */
+class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
+{
+
+ public function __construct() {
+ parent::__construct(true); // always embedded
+ }
+
+ public function validate($uri_string, $config, $context) {
+ // parse the URI out of the string and then pass it onto
+ // the parent object
+
+ $uri_string = $this->parseCDATA($uri_string);
+ if (strpos($uri_string, 'url(') !== 0) return false;
+ $uri_string = substr($uri_string, 4);
+ $new_length = strlen($uri_string) - 1;
+ if ($uri_string[$new_length] != ')') return false;
+ $uri = trim(substr($uri_string, 0, $new_length));
+
+ if (!empty($uri) && ($uri[0] == "'" || $uri[0] == '"')) {
+ $quote = $uri[0];
+ $new_length = strlen($uri) - 1;
+ if ($uri[$new_length] !== $quote) return false;
+ $uri = substr($uri, 1, $new_length - 1);
+ }
+
+ $uri = $this->expandCSSEscape($uri);
+
+ $result = parent::validate($uri, $config, $context);
+
+ if ($result === false) return false;
+
+ // extra sanity check; should have been done by URI
+ $result = str_replace(array('"', "\\", "\n", "\x0c", "\r"), "", $result);
+
+ return "url(\"$result\")";
+
+ }
+
+}
+
+// vim: et sw=4 sts=4