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[2.1.0] Create new URI object and migrate URI validation systems to use it. URIScheme interface changed.
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1334 48356398-32a2-884e-a903-53898d9a118a
This commit is contained in:
Edward Z. Yang
153
library/HTMLPurifier/URI.php
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153
library/HTMLPurifier/URI.php
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<?php
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require_once 'HTMLPurifier/URIParser.php';
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/**
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* HTML Purifier's internal representation of a URI
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*/
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class HTMLPurifier_URI
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{
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var $scheme, $userinfo, $host, $port, $path, $query, $fragment;
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/**
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* @note Automatically normalizes scheme and port
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*/
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function HTMLPurifier_URI($scheme, $userinfo, $host, $port, $path, $query, $fragment) {
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$this->scheme = is_null($scheme) || ctype_lower($scheme) ? $scheme : strtolower($scheme);
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$this->userinfo = $userinfo;
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$this->host = $host;
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$this->port = is_null($port) ? $port : (int) $port;
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$this->path = $path;
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$this->query = $query;
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$this->fragment = $fragment;
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}
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function getSchemeObj($config, &$context) {
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$registry =& HTMLPurifier_URISchemeRegistry::instance();
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if ($this->scheme !== null) {
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$scheme_obj = $registry->getScheme($this->scheme, $config, $context);
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if (!$scheme_obj) return false; // invalid scheme, clean it out
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} else {
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// no scheme: retrieve the default one
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$scheme_obj = $registry->getScheme($config->get('URI', 'DefaultScheme'), $config, $context);
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if (!$scheme_obj) {
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// something funky happened to the default scheme object
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trigger_error(
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'Default scheme object "' . $config->get('URI', 'DefaultScheme') . '" was not readable',
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E_USER_WARNING
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);
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return false;
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}
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}
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return $scheme_obj;
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}
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/**
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* Generic validation method applicable for all schemes
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*/
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function validate($config, &$context) {
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// validate host
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if (!is_null($this->host)) {
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// remove URI if it's absolute and we disabled externals or
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// if it's absolute and embedded and we disabled external resources
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unset($our_host); // ensure this variable is not set
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if (
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$config->get('URI', 'DisableExternal') ||
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(
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$config->get('URI', 'DisableExternalResources') &&
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$context->get('EmbeddedURI', true) // suppress errors
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)
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) {
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$our_host = $config->get('URI', 'Host');
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if ($our_host === null) return false;
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}
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$host_def = new HTMLPurifier_AttrDef_URI_Host();
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$this->host = $host_def->validate($this->host, $config, $context);
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if ($this->host === false) $this->host = null;
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// check host against blacklist
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if ($this->checkBlacklist($this->host, $config, $context)) return false;
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// more lenient absolute checking
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if (isset($our_host)) {
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$host_parts = array_reverse(explode('.', $this->host));
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// could be cached
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$our_host_parts = array_reverse(explode('.', $our_host));
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foreach ($our_host_parts as $i => $discard) {
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if (!isset($host_parts[$i])) return false;
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if ($host_parts[$i] != $our_host_parts[$i]) return false;
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}
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}
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}
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// munge scheme off if necessary
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if (!is_null($this->scheme) && is_null($this->host)) {
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if ($config->get('URI', 'DefaultScheme') == $this->scheme) {
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$this->scheme = null;
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}
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}
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// validate port
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if (!is_null($this->port)) {
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if ($this->port < 1 || $this->port > 65535) $this->port = null;
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}
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// query and fragment are quite simple in terms of definition:
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// *( pchar / "/" / "?" ), so define their validation routines
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// when we start fixing percent encoding
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// path gets to be validated against a hodge-podge of rules depending
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// on the status of authority and scheme, but it's not that important,
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// esp. since it won't be applicable to everyone
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return true;
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}
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/**
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* Checks a host against an array blacklist
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* @param $host Host to check
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* @param $config HTMLPurifier_Config instance
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* @param $context HTMLPurifier_Context instance
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* @return bool Is spam?
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*/
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function checkBlacklist($host, $config, &$context) {
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$blacklist = $config->get('URI', 'HostBlacklist');
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if (!empty($blacklist)) {
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foreach($blacklist as $blacklisted_host_fragment) {
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if (strpos($host, $blacklisted_host_fragment) !== false) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Convert URI back to string
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*/
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function toString() {
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// reconstruct authority
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$authority = null;
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if (!is_null($this->host)) {
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$authority = '';
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if(!is_null($this->userinfo)) $authority .= $this->userinfo . '@';
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$authority .= $this->host;
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if(!is_null($this->port)) $authority .= ':' . $this->port;
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}
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// reconstruct the result
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$result = '';
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if (!is_null($this->scheme)) $result .= $this->scheme . ':';
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if (!is_null($authority)) $result .= '//' . $authority;
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$result .= $this->path;
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if (!is_null($this->query)) $result .= '?' . $this->query;
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if (!is_null($this->fragment)) $result .= '#' . $this->fragment;
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return $result;
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}
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}
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