diff options
Diffstat (limited to 'lib/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php')
-rwxr-xr-x | lib/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/lib/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php b/lib/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php new file mode 100755 index 000000000..435d7930b --- /dev/null +++ b/lib/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php @@ -0,0 +1,56 @@ +<?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); + } + + $keys = array( '(', ')', ',', ' ', '"', "'"); + $values = array('\\(', '\\)', '\\,', '\\ ', '\\"', "\\'"); + $uri = str_replace($values, $keys, $uri); + + $result = parent::validate($uri, $config, $context); + + if ($result === false) return false; + + // escape necessary characters according to CSS spec + // except for the comma, none of these should appear in the + // URI at all + $result = str_replace($keys, $values, $result); + + return "url($result)"; + + } + +} + +// vim: et sw=4 sts=4 |