HTML Purifier's internal representation of a URI. More...

Collaboration diagram for HTMLPurifier_URI:

Public Member Functions
	__construct ($scheme, $userinfo, $host, $port, $path, $query, $fragment)
	getSchemeObj ($config, $context)
	Retrieves a scheme object corresponding to the URI's scheme/default.
	validate ($config, $context)
	Generic validation method applicable for all schemes.
	toString ()
	Convert URI back to string.

Data Fields
	$scheme
	$userinfo
	$host
	$port
	$path
	$query
	$fragment

Detailed Description

HTML Purifier's internal representation of a URI.

Note: Internal data-structures are completely escaped. If the data needs to be used in a non-URI context (which is very unlikely), be sure to decode it first. The URI may not necessarily be well-formed until validate() is called.

Definition at line 11 of file URI.php.

Constructor & Destructor Documentation

HTMLPurifier_URI::__construct	(	$scheme,
		$userinfo,
		$host,
		$port,
		$path,
		$query,
		$fragment
	)

Note: Automatically normalizes scheme and port

Definition at line 19 of file URI.php.

References $fragment, $host, $path, $port, $query, $scheme, and $userinfo.

                                                                                            {
        $this->scheme = is_null($scheme) || ctype_lower($scheme) ? $scheme : strtolower($scheme);
        $this->userinfo = $userinfo;
        $this->host = $host;
        $this->port = is_null($port) ? $port : (int) $port;
        $this->path = $path;
        $this->query = $query;
        $this->fragment = $fragment;
    }

Member Function Documentation

HTMLPurifier_URI::getSchemeObj	(	$config,
		$context
	)

Retrieves a scheme object corresponding to the URI's scheme/default.

Parameters

$config	Instance of HTMLPurifier_Config
$context	Instance of HTMLPurifier_Context

Returns: Scheme object appropriate for validating this URI

Definition at line 35 of file URI.php.

References $config, and HTMLPurifier_URISchemeRegistry\instance().

                                                    {
        $registry = HTMLPurifier_URISchemeRegistry::instance();
        if ($this->scheme !== null) {
            $scheme_obj = $registry->getScheme($this->scheme, $config, $context);
            if (!$scheme_obj) return false; // invalid scheme, clean it out
        } else {
            // no scheme: retrieve the default one
            $def = $config->getDefinition('URI');
            $scheme_obj = $registry->getScheme($def->defaultScheme, $config, $context);
            if (!$scheme_obj) {
                // something funky happened to the default scheme object
                trigger_error(
                    'Default scheme object "' . $def->defaultScheme . '" was not readable',
                    E_USER_WARNING
                );
                return false;
            }
        }
        return $scheme_obj;
    }

Here is the call graph for this function:

HTMLPurifier_URI::toString ( )

Convert URI back to string.

Returns: String URI appropriate for output

Definition at line 173 of file URI.php.

References $fragment, $host, $path, $port, $query, and $result.

                               {
        // reconstruct authority
        $authority = null;
        // there is a rendering difference between a null authority
        // (http:foo-bar) and an empty string authority
        // (http:///foo-bar).
        if (!is_null($this->host)) {
            $authority = '';
            if(!is_null($this->userinfo)) $authority .= $this->userinfo . '@';
            $authority .= $this->host;
            if(!is_null($this->port))     $authority .= ':' . $this->port;
        }
        // Reconstruct the result
        // One might wonder about parsing quirks from browsers after
        // this reconstruction.  Unfortunately, parsing behavior depends
        // on what *scheme* was employed (file:///foo is handled *very*
        // differently than http:///foo), so unfortunately we have to
        // defer to the schemes to do the right thing.
        $result = '';
        if (!is_null($this->scheme))    $result .= $this->scheme . ':';
        if (!is_null($authority))       $result .=  '//' . $authority;
        $result .= $this->path;
        if (!is_null($this->query))     $result .= '?' . $this->query;
        if (!is_null($this->fragment))  $result .= '#' . $this->fragment;
        return $result;
    }

HTMLPurifier_URI::validate	(	$config,
		$context
	)

Generic validation method applicable for all schemes.

May modify this URI in order to get it into a compliant form.

Parameters

$config	Instance of HTMLPurifier_Config
$context	Instance of HTMLPurifier_Context

Returns: True if validation/filtering succeeds, false if failure

Definition at line 63 of file URI.php.

References $config.

                                                {
        // ABNF definitions from RFC 3986
        $chars_sub_delims = '!$&\'()*+,;=';
        $chars_gen_delims = ':/?#[]@';
        $chars_pchar = $chars_sub_delims . ':@';
        // validate host
        if (!is_null($this->host)) {
            $host_def = new HTMLPurifier_AttrDef_URI_Host();
            $this->host = $host_def->validate($this->host, $config, $context);
            if ($this->host === false) $this->host = null;
        }
        // validate scheme
        // NOTE: It's not appropriate to check whether or not this
        // scheme is in our registry, since a URIFilter may convert a
        // URI that we don't allow into one we do.  So instead, we just
        // check if the scheme can be dropped because there is no host
        // and it is our default scheme.
        if (!is_null($this->scheme) && is_null($this->host) || $this->host === '') {
            // support for relative paths is pretty abysmal when the
            // scheme is present, so axe it when possible
            $def = $config->getDefinition('URI');
            if ($def->defaultScheme === $this->scheme) {
                $this->scheme = null;
            }
        }
        // validate username
        if (!is_null($this->userinfo)) {
            $encoder = new HTMLPurifier_PercentEncoder($chars_sub_delims . ':');
            $this->userinfo = $encoder->encode($this->userinfo);
        }
        // validate port
        if (!is_null($this->port)) {
            if ($this->port < 1 || $this->port > 65535) $this->port = null;
        }
        // validate path
        $path_parts = array();
        $segments_encoder = new HTMLPurifier_PercentEncoder($chars_pchar . '/');
        if (!is_null($this->host)) { // this catches $this->host === ''
            // path-abempty (hier and relative)
            // http://www.example.com/my/path
            // //www.example.com/my/path (looks odd, but works, and
            //                            recognized by most browsers)
            // (this set is valid or invalid on a scheme by scheme
            // basis, so we'll deal with it later)
            // file:///my/path
            // ///my/path
            $this->path = $segments_encoder->encode($this->path);
        } elseif ($this->path !== '') {
            if ($this->path[0] === '/') {
                // path-absolute (hier and relative)
                // http:/my/path
                // /my/path
                if (strlen($this->path) >= 2 && $this->path[1] === '/') {
                    // This could happen if both the host gets stripped
                    // out
                    // http://my/path
                    // //my/path
                    $this->path = '';
                } else {
                    $this->path = $segments_encoder->encode($this->path);
                }
            } elseif (!is_null($this->scheme)) {
                // path-rootless (hier)
                // http:my/path
                // Short circuit evaluation means we don't need to check nz
                $this->path = $segments_encoder->encode($this->path);
            } else {
                // path-noscheme (relative)
                // my/path
                // (once again, not checking nz)
                $segment_nc_encoder = new HTMLPurifier_PercentEncoder($chars_sub_delims . '@');
                $c = strpos($this->path, '/');
                if ($c !== false) {
                    $this->path =
                        $segment_nc_encoder->encode(substr($this->path, 0, $c)) .
                        $segments_encoder->encode(substr($this->path, $c));
                } else {
                    $this->path = $segment_nc_encoder->encode($this->path);
                }
            }
        } else {
            // path-empty (hier and relative)
            $this->path = ''; // just to be safe
        }
        // qf = query and fragment
        $qf_encoder = new HTMLPurifier_PercentEncoder($chars_pchar . '/?');
        if (!is_null($this->query)) {
            $this->query = $qf_encoder->encode($this->query);
        }
        if (!is_null($this->fragment)) {
            $this->fragment = $qf_encoder->encode($this->fragment);
        }
        return true;
    }