*/
function nl2br_escaped($html)
{
- return str_replace('>','>',str_replace('<','<',nl2br($html)));
+ return str_replace('>', '>', str_replace('<', '<', nl2br($html)));
}
/**
$date = DateTime::createFromFormat($format, $string);
return $date && $date->format($string) == $string;
}
-?>
+
+/**
+ * Generate a header location from HTTP_REFERER.
+ * Make sure the referer is Shaarli itself and prevent redirection loop.
+ *
+ * @param string $referer - HTTP_REFERER.
+ * @param string $host - Server HOST.
+ * @param array $loopTerms - Contains list of term to prevent redirection loop.
+ *
+ * @return string $referer - final referer.
+ */
+function generateLocation($referer, $host, $loopTerms = array())
+{
+ $finalReferer = '?';
+
+ // No referer if it contains any value in $loopCriteria.
+ foreach ($loopTerms as $value) {
+ if (strpos($referer, $value) !== false) {
+ return $finalReferer;
+ }
+ }
+
+ // Remove port from HTTP_HOST
+ if ($pos = strpos($host, ':')) {
+ $host = substr($host, 0, $pos);
+ }
+
+ $refererHost = parse_url($referer, PHP_URL_HOST);
+ if (!empty($referer) && (strpos($refererHost, $host) !== false || startsWith('?', $refererHost))) {
+ $finalReferer = $referer;
+ }
+
+ return $finalReferer;
+}
+
+/**
+ * Validate session ID to prevent Full Path Disclosure.
+ *
+ * See #298.
+ * The session ID's format depends on the hash algorithm set in PHP settings
+ *
+ * @param string $sessionId Session ID
+ *
+ * @return true if valid, false otherwise.
+ *
+ * @see http://php.net/manual/en/function.hash-algos.php
+ * @see http://php.net/manual/en/session.configuration.php
+ */
+function is_session_id_valid($sessionId)
+{
+ if (empty($sessionId)) {
+ return false;
+ }
+
+ if (!$sessionId) {
+ return false;
+ }
+
+ if (!preg_match('/^[a-zA-Z0-9,-]{2,128}$/', $sessionId)) {
+ return false;
+ }
+
+ return true;
+}