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author | zotlabs <mike@macgirvin.com> | 2017-03-27 14:11:25 -0700 |
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committer | zotlabs <mike@macgirvin.com> | 2017-03-27 14:11:25 -0700 |
commit | 8292553a2087a412e0b10f5593d461d371169adb (patch) | |
tree | 2648714d80a19154ec19defa92aaa3229cae23c6 /vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php | |
parent | 5cbf60320355845e2abdec0422055d3fe321e84e (diff) | |
parent | 6375401e0af6c52d151dd2b944aa6a054b8ddc05 (diff) | |
download | volse-hubzilla-8292553a2087a412e0b10f5593d461d371169adb.tar.gz volse-hubzilla-8292553a2087a412e0b10f5593d461d371169adb.tar.bz2 volse-hubzilla-8292553a2087a412e0b10f5593d461d371169adb.zip |
Merge branch 'dev' of https://github.com/redmatrix/hubzilla into xdev_merge
Diffstat (limited to 'vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php')
-rw-r--r-- | vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php new file mode 100644 index 000000000..6617acace --- /dev/null +++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php @@ -0,0 +1,77 @@ +<?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 + } + + /** + * @param string $uri_string + * @param HTMLPurifier_Config $config + * @param HTMLPurifier_Context $context + * @return bool|string + */ + public function validate($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); + if (strlen($uri_string) == 0) { + return false; + } + $new_length = strlen($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); + + // suspicious characters are ()'; we're going to percent encode + // them for safety. + $result = str_replace(array('(', ')', "'"), array('%28', '%29', '%27'), $result); + + // there's an extra bug where ampersands lose their escaping on + // an innerHTML cycle, so a very unlucky query parameter could + // then change the meaning of the URL. Unfortunately, there's + // not much we can do about that... + return "url(\"$result\")"; + } +} + +// vim: et sw=4 sts=4 |