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egroupware/egw-pear/HTTP/WebDAV/Server.php

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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Hartmut Holzgraefe <hholzgra@php.net> |
// | Christian Stocker <chregu@bitflux.ch> |
// +----------------------------------------------------------------------+
//
// $Id: Server.php,v 1.56 2006/10/10 11:53:16 hholzgra Exp $
//
require_once "HTTP/WebDAV/Tools/_parse_propfind.php";
require_once "HTTP/WebDAV/Tools/_parse_proppatch.php";
require_once "HTTP/WebDAV/Tools/_parse_lockinfo.php";
/**
* Virtual base class for implementing WebDAV servers
*
* WebDAV server base class, needs to be extended to do useful work
*
* @package HTTP_WebDAV_Server
* @author Hartmut Holzgraefe <hholzgra@php.net>
* @version @package_version@
*/
class HTTP_WebDAV_Server
{
// {{{ Member Variables
/**
* complete URI for this request
*
* @var string
*/
var $uri;
/**
* base URI for this request
*
* @var string
*/
var $base_uri;
/**
* URI path for this request
*
* @var string
*/
var $path;
/**
* Realm string to be used in authentification popups
*
* @var string
*/
var $http_auth_realm = "PHP WebDAV";
/**
* String to be used in "X-Dav-Powered-By" header
*
* @var string
*/
var $dav_powered_by = "";
/**
* Remember parsed If: (RFC2518/9.4) header conditions
*
* @var array
*/
var $_if_header_uris = array();
/**
* HTTP response status/message
*
* @var string
*/
var $_http_status = "200 OK";
/**
* encoding of property values passed in
*
* @var string
*/
var $_prop_encoding = "utf-8";
/**
* Copy of $_SERVER superglobal array
*
* Derived classes may extend the constructor to
* modify its contents
*
* @var array
*/
var $_SERVER;
// }}}
// {{{ Constructor
/**
* Constructor
*
* @param void
*/
function HTTP_WebDAV_Server()
{
// PHP messages destroy XML output -> switch them off
ini_set("display_errors", 0);
// copy $_SERVER variables to local _SERVER array
// so that derived classes can simply modify these
$this->_SERVER = $_SERVER;
}
// }}}
// {{{ ServeRequest()
/**
* Serve WebDAV HTTP request
*
* dispatch WebDAV HTTP request to the apropriate method handler
*
* @param void
* @return void
*/
function ServeRequest()
{
// prevent warning in litmus check 'delete_fragment'
if (strstr($this->_SERVER["REQUEST_URI"], '#')) {
$this->http_status("400 Bad Request");
return;
}
// default uri is the complete request uri
$uri = (@$this->_SERVER["HTTPS"] === "on" ? "https:" : "http:");
$uri.= "//$this->_SERVER[HTTP_HOST]$this->_SERVER[SCRIPT_NAME]";
$path_info = empty($this->_SERVER["PATH_INFO"]) ? "/" : $this->_SERVER["PATH_INFO"];
$this->base_uri = $uri;
$this->uri = $uri . $path_info;
// set path
$this->path = $this->_urldecode($path_info);
if (!strlen($this->path)) {
if ($this->_SERVER["REQUEST_METHOD"] == "GET") {
// redirect clients that try to GET a collection
// WebDAV clients should never try this while
// regular HTTP clients might ...
header("Location: ".$this->base_uri."/");
return;
} else {
// if a WebDAV client didn't give a path we just assume '/'
$this->path = "/";
}
}
if (ini_get("magic_quotes_gpc")) {
$this->path = stripslashes($this->path);
}
// identify ourselves
if (empty($this->dav_powered_by)) {
header("X-Dav-Powered-By: PHP class: ".get_class($this));
} else {
header("X-Dav-Powered-By: ".$this->dav_powered_by);
}
// check authentication
// for the motivation for not checking OPTIONS requests on / see
// http://pear.php.net/bugs/bug.php?id=5363
if ( ( !(($this->_SERVER['REQUEST_METHOD'] == 'OPTIONS') && ($this->path == "/")))
&& (!$this->_check_auth())) {
// RFC2518 says we must use Digest instead of Basic
// but Microsoft Clients do not support Digest
// and we don't support NTLM and Kerberos
// so we are stuck with Basic here
header('WWW-Authenticate: Basic realm="'.($this->http_auth_realm).'"');
// Windows seems to require this being the last header sent
// (changed according to PECL bug #3138)
$this->http_status('401 Unauthorized');
return;
}
// check
if (! $this->_check_if_header_conditions()) {
return;
}
// detect requested method names
$method = strtolower($this->_SERVER["REQUEST_METHOD"]);
$wrapper = "http_".$method;
// activate HEAD emulation by GET if no HEAD method found
if ($method == "head" && !method_exists($this, "head")) {
$method = "get";
}
if (method_exists($this, $wrapper) && ($method == "options" || method_exists($this, $method))) {
$this->$wrapper(); // call method by name
} else { // method not found/implemented
if ($this->_SERVER["REQUEST_METHOD"] == "LOCK") {
$this->http_status("412 Precondition failed");
} else {
$this->http_status("405 Method not allowed");
header("Allow: ".join(", ", $this->_allow())); // tell client what's allowed
}
}
}
// }}}
// {{{ abstract WebDAV methods
// {{{ GET()
/**
* GET implementation
*
* overload this method to retrieve resources from your server
* <br>
*
*
* @abstract
* @param array &$params Array of input and output parameters
* <br><b>input</b><ul>
* <li> path -
* </ul>
* <br><b>output</b><ul>
* <li> size -
* </ul>
* @returns int HTTP-Statuscode
*/
/* abstract
function GET(&$params)
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ PUT()
/**
* PUT implementation
*
* PUT implementation
*
* @abstract
* @param array &$params
* @returns int HTTP-Statuscode
*/
/* abstract
function PUT()
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ COPY()
/**
* COPY implementation
*
* COPY implementation
*
* @abstract
* @param array &$params
* @returns int HTTP-Statuscode
*/
/* abstract
function COPY()
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ MOVE()
/**
* MOVE implementation
*
* MOVE implementation
*
* @abstract
* @param array &$params
* @returns int HTTP-Statuscode
*/
/* abstract
function MOVE()
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ DELETE()
/**
* DELETE implementation
*
* DELETE implementation
*
* @abstract
* @param array &$params
* @returns int HTTP-Statuscode
*/
/* abstract
function DELETE()
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ PROPFIND()
/**
* PROPFIND implementation
*
* PROPFIND implementation
*
* @abstract
* @param array &$params
* @returns int HTTP-Statuscode
*/
/* abstract
function PROPFIND()
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ PROPPATCH()
/**
* PROPPATCH implementation
*
* PROPPATCH implementation
*
* @abstract
* @param array &$params
* @returns int HTTP-Statuscode
*/
/* abstract
function PROPPATCH()
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ LOCK()
/**
* LOCK implementation
*
* LOCK implementation
*
* @abstract
* @param array &$params
* @returns int HTTP-Statuscode
*/
/* abstract
function LOCK()
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ UNLOCK()
/**
* UNLOCK implementation
*
* UNLOCK implementation
*
* @abstract
* @param array &$params
* @returns int HTTP-Statuscode
*/
/* abstract
function UNLOCK()
{
// dummy entry for PHPDoc
}
*/
// }}}
// }}}
// {{{ other abstract methods
// {{{ check_auth()
/**
* check authentication
*
* overload this method to retrieve and confirm authentication information
*
* @abstract
* @param string type Authentication type, e.g. "basic" or "digest"
* @param string username Transmitted username
* @param string passwort Transmitted password
* @returns bool Authentication status
*/
/* abstract
function checkAuth($type, $username, $password)
{
// dummy entry for PHPDoc
}
*/
// }}}
// {{{ checklock()
/**
* check lock status for a resource
*
* overload this method to return shared and exclusive locks
* active for this resource
*
* @abstract
* @param string resource Resource path to check
* @returns array An array of lock entries each consisting
* of 'type' ('shared'/'exclusive'), 'token' and 'timeout'
*/
/* abstract
function checklock($resource)
{
// dummy entry for PHPDoc
}
*/
// }}}
// }}}
// {{{ WebDAV HTTP method wrappers
// {{{ http_OPTIONS()
/**
* OPTIONS method handler
*
* The OPTIONS method handler creates a valid OPTIONS reply
* including Dav: and Allowed: heaers
* based on the implemented methods found in the actual instance
*
* @param void
* @return void
*/
function http_OPTIONS()
{
// Microsoft clients default to the Frontpage protocol
// unless we tell them to use WebDAV
header("MS-Author-Via: DAV");
// get allowed methods
$allow = $this->_allow();
// dav header
$dav = array(1); // assume we are always dav class 1 compliant
if (isset($allow['LOCK'])) {
$dav[] = 2; // dav class 2 requires that locking is supported
}
// tell clients what we found
$this->http_status("200 OK");
header("DAV: " .join(", ", $dav));
header("Allow: ".join(", ", $allow));
header("Content-length: 0");
}
// }}}
// {{{ http_PROPFIND()
/**
* PROPFIND method handler
*
* @param void
* @return void
*/
function http_PROPFIND()
{
$options = Array();
$files = Array();
$options["path"] = $this->path;
// search depth from header (default is "infinity)
if (isset($this->_SERVER['HTTP_DEPTH'])) {
$options["depth"] = $this->_SERVER["HTTP_DEPTH"];
} else {
$options["depth"] = "infinity";
}
// analyze request payload
$propinfo = new _parse_propfind("php://input");
if (!$propinfo->success) {
$this->http_status("400 Error");
return;
}
$options['props'] = $propinfo->props;
// call user handler
if (!$this->PROPFIND($options, $files)) {
$files = array("files" => array());
if (method_exists($this, "checkLock")) {
// is locked?
$lock = $this->checkLock($this->path);
if (is_array($lock) && count($lock)) {
$created = isset($lock['created']) ? $lock['created'] : time();
$modified = isset($lock['modified']) ? $lock['modified'] : time();
$files['files'][] = array("path" => $this->_slashify($this->path),
"props" => array($this->mkprop("displayname", $this->path),
$this->mkprop("creationdate", $created),
$this->mkprop("getlastmodified", $modified),
$this->mkprop("resourcetype", ""),
$this->mkprop("getcontenttype", ""),
$this->mkprop("getcontentlength", 0))
);
}
}
if (empty($files['files'])) {
$this->http_status("404 Not Found");
return;
}
}
// collect namespaces here
$ns_hash = array();
// Microsoft Clients need this special namespace for date and time values
$ns_defs = "xmlns:ns0=\"urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/\"";
// now we loop over all returned file entries
foreach ($files["files"] as $filekey => $file) {
// nothing to do if no properties were returend for a file
if (!isset($file["props"]) || !is_array($file["props"])) {
continue;
}
// now loop over all returned properties
foreach ($file["props"] as $key => $prop) {
// as a convenience feature we do not require that user handlers
// restrict returned properties to the requested ones
// here we strip all unrequested entries out of the response
switch($options['props']) {
case "all":
// nothing to remove
break;
case "names":
// only the names of all existing properties were requested
// so we remove all values
unset($files["files"][$filekey]["props"][$key]["val"]);
break;
default:
$found = false;
// search property name in requested properties
foreach ((array)$options["props"] as $reqprop) {
if ( $reqprop["name"] == $prop["name"]
&& @$reqprop["xmlns"] == $prop["ns"]) {
$found = true;
break;
}
}
// unset property and continue with next one if not found/requested
if (!$found) {
$files["files"][$filekey]["props"][$key]="";
continue(2);
}
break;
}
// namespace handling
if (empty($prop["ns"])) continue; // no namespace
$ns = $prop["ns"];
if ($ns == "DAV:") continue; // default namespace
if (isset($ns_hash[$ns])) continue; // already known
// register namespace
$ns_name = "ns".(count($ns_hash) + 1);
$ns_hash[$ns] = $ns_name;
$ns_defs .= " xmlns:$ns_name=\"$ns\"";
}
// we also need to add empty entries for properties that were requested
// but for which no values where returned by the user handler
if (is_array($options['props'])) {
foreach ($options["props"] as $reqprop) {
if ($reqprop['name']=="") continue; // skip empty entries
$found = false;
// check if property exists in result
foreach ($file["props"] as $prop) {
if ( $reqprop["name"] == $prop["name"]
&& @$reqprop["xmlns"] == $prop["ns"]) {
$found = true;
break;
}
}
if (!$found) {
if ($reqprop["xmlns"]==="DAV:" && $reqprop["name"]==="lockdiscovery") {
// lockdiscovery is handled by the base class
$files["files"][$filekey]["props"][]
= $this->mkprop("DAV:",
"lockdiscovery",
$this->lockdiscovery($files["files"][$filekey]['path']));
} else {
// add empty value for this property
$files["files"][$filekey]["noprops"][] =
$this->mkprop($reqprop["xmlns"], $reqprop["name"], "");
// register property namespace if not known yet
if ($reqprop["xmlns"] != "DAV:" && !isset($ns_hash[$reqprop["xmlns"]])) {
$ns_name = "ns".(count($ns_hash) + 1);
$ns_hash[$reqprop["xmlns"]] = $ns_name;
$ns_defs .= " xmlns:$ns_name=\"$reqprop[xmlns]\"";
}
}
}
}
}
}
// now we generate the reply header ...
$this->http_status("207 Multi-Status");
header('Content-Type: text/xml; charset="utf-8"');
// ... and payload
echo "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
echo "<D:multistatus xmlns:D=\"DAV:\">\n";
foreach ($files["files"] as $file) {
// ignore empty or incomplete entries
if (!is_array($file) || empty($file) || !isset($file["path"])) continue;
$path = $file['path'];
if (!is_string($path) || $path==="") continue;
echo " <D:response $ns_defs>\n";
/* TODO right now the user implementation has to make sure
collections end in a slash, this should be done in here
by checking the resource attribute */
$href = $this->_mergePathes($this->_SERVER['SCRIPT_NAME'], $path);
echo " <D:href>$href</D:href>\n";
// report all found properties and their values (if any)
if (isset($file["props"]) && is_array($file["props"])) {
echo " <D:propstat>\n";
echo " <D:prop>\n";
foreach ($file["props"] as $key => $prop) {
if (!is_array($prop)) continue;
if (!isset($prop["name"])) continue;
if (!isset($prop["val"]) || $prop["val"] === "" || $prop["val"] === false) {
// empty properties (cannot use empty() for check as "0" is a legal value here)
if ($prop["ns"]=="DAV:") {
echo " <D:$prop[name]/>\n";
} else if (!empty($prop["ns"])) {
echo " <".$ns_hash[$prop["ns"]].":$prop[name]/>\n";
} else {
echo " <$prop[name] xmlns=\"\"/>";
}
} else if ($prop["ns"] == "DAV:") {
// some WebDAV properties need special treatment
switch ($prop["name"]) {
case "creationdate":
echo " <D:creationdate ns0:dt=\"dateTime.tz\">"
. gmdate("Y-m-d\\TH:i:s\\Z", $prop['val'])
. "</D:creationdate>\n";
break;
case "getlastmodified":
echo " <D:getlastmodified ns0:dt=\"dateTime.rfc1123\">"
. gmdate("D, d M Y H:i:s ", $prop['val'])
. "GMT</D:getlastmodified>\n";
break;
case "resourcetype":
echo " <D:resourcetype><D:$prop[val]/></D:resourcetype>\n";
break;
case "supportedlock":
echo " <D:supportedlock>$prop[val]</D:supportedlock>\n";
break;
case "lockdiscovery":
echo " <D:lockdiscovery>\n";
echo $prop["val"];
echo " </D:lockdiscovery>\n";
break;
default:
echo " <D:$prop[name]>"
. $this->_prop_encode(htmlspecialchars($prop['val']))
. "</D:$prop[name]>\n";
break;
}
} else {
// properties from namespaces != "DAV:" or without any namespace
if ($prop["ns"]) {
echo " <" . $ns_hash[$prop["ns"]] . ":$prop[name]>"
. $this->_prop_encode(htmlspecialchars($prop['val']))
. "</" . $ns_hash[$prop["ns"]] . ":$prop[name]>\n";
} else {
echo " <$prop[name] xmlns=\"\">"
. $this->_prop_encode(htmlspecialchars($prop['val']))
. "</$prop[name]>\n";
}
}
}
echo " </D:prop>\n";
echo " <D:status>HTTP/1.1 200 OK</D:status>\n";
echo " </D:propstat>\n";
}
// now report all properties requested but not found
if (isset($file["noprops"])) {
echo " <D:propstat>\n";
echo " <D:prop>\n";
foreach ($file["noprops"] as $key => $prop) {
if ($prop["ns"] == "DAV:") {
echo " <D:$prop[name]/>\n";
} else if ($prop["ns"] == "") {
echo " <$prop[name] xmlns=\"\"/>\n";
} else {
echo " <" . $ns_hash[$prop["ns"]] . ":$prop[name]/>\n";
}
}
echo " </D:prop>\n";
echo " <D:status>HTTP/1.1 404 Not Found</D:status>\n";
echo " </D:propstat>\n";
}
echo " </D:response>\n";
}
echo "</D:multistatus>\n";
}
// }}}
// {{{ http_PROPPATCH()
/**
* PROPPATCH method handler
*
* @param void
* @return void
*/
function http_PROPPATCH()
{
if ($this->_check_lock_status($this->path)) {
$options = Array();
$options["path"] = $this->path;
$propinfo = new _parse_proppatch("php://input");
if (!$propinfo->success) {
$this->http_status("400 Error");
return;
}
$options['props'] = $propinfo->props;
$responsedescr = $this->PROPPATCH($options);
$this->http_status("207 Multi-Status");
header('Content-Type: text/xml; charset="utf-8"');
echo "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
echo "<D:multistatus xmlns:D=\"DAV:\">\n";
echo " <D:response>\n";
echo " <D:href>".$this->_urlencode($this->_mergePathes($this->_SERVER["SCRIPT_NAME"], $this->path))."</D:href>\n";
foreach ($options["props"] as $prop) {
echo " <D:propstat>\n";
echo " <D:prop><$prop[name] xmlns=\"$prop[ns]\"/></D:prop>\n";
echo " <D:status>HTTP/1.1 $prop[status]</D:status>\n";
echo " </D:propstat>\n";
}
if ($responsedescr) {
echo " <D:responsedescription>".
$this->_prop_encode(htmlspecialchars($responsedescr)).
"</D:responsedescription>\n";
}
echo " </D:response>\n";
echo "</D:multistatus>\n";
} else {
$this->http_status("423 Locked");
}
}
// }}}
// {{{ http_MKCOL()
/**
* MKCOL method handler
*
* @param void
* @return void
*/
function http_MKCOL()
{
$options = Array();
$options["path"] = $this->path;
$stat = $this->MKCOL($options);
$this->http_status($stat);
}
// }}}
// {{{ http_GET()
/**
* GET method handler
*
* @param void
* @returns void
*/
function http_GET()
{
// TODO check for invalid stream
$options = Array();
$options["path"] = $this->path;
$this->_get_ranges($options);
if (true === ($status = $this->GET($options))) {
if (!headers_sent()) {
$status = "200 OK";
if (!isset($options['mimetype'])) {
$options['mimetype'] = "application/octet-stream";
}
header("Content-type: $options[mimetype]");
if (isset($options['mtime'])) {
header("Last-modified:".gmdate("D, d M Y H:i:s ", $options['mtime'])."GMT");
}
if (isset($options['stream'])) {
// GET handler returned a stream
if (!empty($options['ranges']) && (0===fseek($options['stream'], 0, SEEK_SET))) {
// partial request and stream is seekable
if (count($options['ranges']) === 1) {
$range = $options['ranges'][0];
if (isset($range['start'])) {
fseek($options['stream'], $range['start'], SEEK_SET);
if (feof($options['stream'])) {
$this->http_status("416 Requested range not satisfiable");
return;
}
if (isset($range['end'])) {
$size = $range['end']-$range['start']+1;
$this->http_status("206 partial");
header("Content-length: $size");
header("Content-range: $range[start]-$range[end]/"
. (isset($options['size']) ? $options['size'] : "*"));
while ($size && !feof($options['stream'])) {
$buffer = fread($options['stream'], 4096);
$size -= $this->bytes($buffer);
echo $buffer;
}
} else {
$this->http_status("206 partial");
if (isset($options['size'])) {
header("Content-length: ".($options['size'] - $range['start']));
header("Content-range: ".$range['start']."-".$range['end']."/"
. (isset($options['size']) ? $options['size'] : "*"));
}
fpassthru($options['stream']);
}
} else {
header("Content-length: ".$range['last']);
fseek($options['stream'], -$range['last'], SEEK_END);
fpassthru($options['stream']);
}
} else {
$this->_multipart_byterange_header(); // init multipart
foreach ($options['ranges'] as $range) {
// TODO what if size unknown? 500?
if (isset($range['start'])) {
$from = $range['start'];
$to = !empty($range['end']) ? $range['end'] : $options['size']-1;
} else {
$from = $options['size'] - $range['last']-1;
$to = $options['size'] -1;
}
$total = isset($options['size']) ? $options['size'] : "*";
$size = $to - $from + 1;
$this->_multipart_byterange_header($options['mimetype'], $from, $to, $total);
fseek($options['stream'], $from, SEEK_SET);
while ($size && !feof($options['stream'])) {
$buffer = fread($options['stream'], 4096);
$size -= $this->bytes($buffer);
echo $buffer;
}
}
$this->_multipart_byterange_header(); // end multipart
}
} else {
// normal request or stream isn't seekable, return full content
if (isset($options['size'])) {
header("Content-length: ".$options['size']);
}
fpassthru($options['stream']);
return; // no more headers
}
} elseif (isset($options['data'])) {
if (is_array($options['data'])) {
// reply to partial request
} else {
header("Content-length: ".$this->bytes($options['data']));
echo $options['data'];
}
}
}
}
if (!headers_sent()) {
if (false === $status) {
$this->http_status("404 not found");
} else {
// TODO: check setting of headers in various code pathes above
$this->http_status("$status");
}
}
}
/**
* parse HTTP Range: header
*
* @param array options array to store result in
* @return void
*/
function _get_ranges(&$options)
{
// process Range: header if present
if (isset($this->_SERVER['HTTP_RANGE'])) {
// we only support standard "bytes" range specifications for now
if (preg_match('/bytes\s*=\s*(.+)/', $this->_SERVER['HTTP_RANGE'], $matches)) {
$options["ranges"] = array();
// ranges are comma separated
foreach (explode(",", $matches[1]) as $range) {
// ranges are either from-to pairs or just end positions
list($start, $end) = explode("-", $range);
$options["ranges"][] = ($start==="")
? array("last"=>$end)
: array("start"=>$start, "end"=>$end);
}
}
}
}
/**
* generate separator headers for multipart response
*
* first and last call happen without parameters to generate
* the initial header and closing sequence, all calls inbetween
* require content mimetype, start and end byte position and
* optionaly the total byte length of the requested resource
*
* @param string mimetype
* @param int start byte position
* @param int end byte position
* @param int total resource byte size
*/
function _multipart_byterange_header($mimetype = false, $from = false, $to=false, $total=false)
{
if ($mimetype === false) {
if (!isset($this->multipart_separator)) {
// initial
// a little naive, this sequence *might* be part of the content
// but it's really not likely and rather expensive to check
$this->multipart_separator = "SEPARATOR_".md5(microtime());
// generate HTTP header
header("Content-type: multipart/byteranges; boundary=".$this->multipart_separator);
} else {
// final
// generate closing multipart sequence
echo "\n--{$this->multipart_separator}--";
}
} else {
// generate separator and header for next part
echo "\n--{$this->multipart_separator}\n";
echo "Content-type: $mimetype\n";
echo "Content-range: $from-$to/". ($total === false ? "*" : $total);
echo "\n\n";
}
}
// }}}
// {{{ http_HEAD()
/**
* HEAD method handler
*
* @param void
* @return void
*/
function http_HEAD()
{
$status = false;
$options = Array();
$options["path"] = $this->path;
if (method_exists($this, "HEAD")) {
$status = $this->head($options);
} else if (method_exists($this, "GET")) {
ob_start();
$status = $this->GET($options);
if (!isset($options['size'])) {
$options['size'] = ob_get_length();
}
ob_end_clean();
}
if (!isset($options['mimetype'])) {
$options['mimetype'] = "application/octet-stream";
}
header("Content-type: $options[mimetype]");
if (isset($options['mtime'])) {
header("Last-modified:".gmdate("D, d M Y H:i:s ", $options['mtime'])."GMT");
}
if (isset($options['size'])) {
header("Content-length: ".$options['size']);
}
if ($status === true) $status = "200 OK";
if ($status === false) $status = "404 Not found";
$this->http_status($status);
}
// }}}
// {{{ http_PUT()
/**
* PUT method handler
*
* @param void
* @return void
*/
function http_PUT()
{
if ($this->_check_lock_status($this->path)) {
$options = Array();
$options["path"] = $this->path;
$options["content_length"] = $this->_SERVER["CONTENT_LENGTH"];
// get the Content-type
if (isset($this->_SERVER["CONTENT_TYPE"])) {
// for now we do not support any sort of multipart requests
if (!strncmp($this->_SERVER["CONTENT_TYPE"], "multipart/", 10)) {
$this->http_status("501 not implemented");
echo "The service does not support mulipart PUT requests";
return;
}
$options["content_type"] = $this->_SERVER["CONTENT_TYPE"];
} else {
// default content type if none given
$options["content_type"] = "application/octet-stream";
}
/* RFC 2616 2.6 says: "The recipient of the entity MUST NOT
ignore any Content-* (e.g. Content-Range) headers that it
does not understand or implement and MUST return a 501
(Not Implemented) response in such cases."
*/
foreach ($this->_SERVER as $key => $val) {
if (strncmp($key, "HTTP_CONTENT", 11)) continue;
switch ($key) {
case 'HTTP_CONTENT_ENCODING': // RFC 2616 14.11
// TODO support this if ext/zlib filters are available
$this->http_status("501 not implemented");
echo "The service does not support '$val' content encoding";
return;
case 'HTTP_CONTENT_LANGUAGE': // RFC 2616 14.12
// we assume it is not critical if this one is ignored
// in the actual PUT implementation ...
$options["content_language"] = $val;
break;
case 'HTTP_CONTENT_LOCATION': // RFC 2616 14.14
/* The meaning of the Content-Location header in PUT
or POST requests is undefined; servers are free
to ignore it in those cases. */
break;
case 'HTTP_CONTENT_RANGE': // RFC 2616 14.16
// single byte range requests are supported
// the header format is also specified in RFC 2616 14.16
// TODO we have to ensure that implementations support this or send 501 instead
if (!preg_match('@bytes\s+(\d+)-(\d+)/((\d+)|\*)@', $val, $matches)) {
$this->http_status("400 bad request");
echo "The service does only support single byte ranges";
return;
}
$range = array("start"=>$matches[1], "end"=>$matches[2]);
if (is_numeric($matches[3])) {
$range["total_length"] = $matches[3];
}
$option["ranges"][] = $range;
// TODO make sure the implementation supports partial PUT
// this has to be done in advance to avoid data being overwritten
// on implementations that do not support this ...
break;
case 'HTTP_CONTENT_MD5': // RFC 2616 14.15
// TODO: maybe we can just pretend here?
$this->http_status("501 not implemented");
echo "The service does not support content MD5 checksum verification";
return;
default:
// any other unknown Content-* headers
$this->http_status("501 not implemented");
echo "The service does not support '$key'";
return;
}
}
$options["stream"] = fopen("php://input", "r");
$stat = $this->PUT($options);
if ($stat === false) {
$stat = "403 Forbidden";
} else if (is_resource($stat) && get_resource_type($stat) == "stream") {
$stream = $stat;
$stat = $options["new"] ? "201 Created" : "204 No Content";
if (!empty($options["ranges"])) {
// TODO multipart support is missing (see also above)
if (0 == fseek($stream, $range[0]["start"], SEEK_SET)) {
$length = $range[0]["end"]-$range[0]["start"]+1;
if (!fwrite($stream, fread($options["stream"], $length))) {
$stat = "403 Forbidden";
}
} else {
$stat = "403 Forbidden";
}
} else {
while (!feof($options["stream"])) {
if (false === fwrite($stream, fread($options["stream"], 4096))) {
$stat = "403 Forbidden";
break;
}
}
}
fclose($stream);
}
$this->http_status($stat);
} else {
$this->http_status("423 Locked");
}
}
// }}}
// {{{ http_DELETE()
/**
* DELETE method handler
*
* @param void
* @return void
*/
function http_DELETE()
{
// check RFC 2518 Section 9.2, last paragraph
if (isset($this->_SERVER["HTTP_DEPTH"])) {
if ($this->_SERVER["HTTP_DEPTH"] != "infinity") {
$this->http_status("400 Bad Request");
return;
}
}
// check lock status
if ($this->_check_lock_status($this->path)) {
// ok, proceed
$options = Array();
$options["path"] = $this->path;
$stat = $this->DELETE($options);
$this->http_status($stat);
} else {
// sorry, its locked
$this->http_status("423 Locked");
}
}
// }}}
// {{{ http_COPY()
/**
* COPY method handler
*
* @param void
* @return void
*/
function http_COPY()
{
// no need to check source lock status here
// destination lock status is always checked by the helper method
$this->_copymove("copy");
}
// }}}
// {{{ http_MOVE()
/**
* MOVE method handler
*
* @param void
* @return void
*/
function http_MOVE()
{
if ($this->_check_lock_status($this->path)) {
// destination lock status is always checked by the helper method
$this->_copymove("move");
} else {
$this->http_status("423 Locked");
}
}
// }}}
// {{{ http_LOCK()
/**
* LOCK method handler
*
* @param void
* @return void
*/
function http_LOCK()
{
$options = Array();
$options["path"] = $this->path;
if (isset($this->_SERVER['HTTP_DEPTH'])) {
$options["depth"] = $this->_SERVER["HTTP_DEPTH"];
} else {
$options["depth"] = "infinity";
}
if (isset($this->_SERVER["HTTP_TIMEOUT"])) {
$options["timeout"] = explode(",", $this->_SERVER["HTTP_TIMEOUT"]);
}
if (empty($this->_SERVER['CONTENT_LENGTH']) && !empty($this->_SERVER['HTTP_IF'])) {
// check if locking is possible
if (!$this->_check_lock_status($this->path)) {
$this->http_status("423 Locked");
return;
}
// refresh lock
$options["locktoken"] = substr($this->_SERVER['HTTP_IF'], 2, -2);
$options["update"] = $options["locktoken"];
// setting defaults for required fields, LOCK() SHOULD overwrite these
$options['owner'] = "unknown";
$options['scope'] = "exclusive";
$options['type'] = "write";
$stat = $this->LOCK($options);
} else {
// extract lock request information from request XML payload
$lockinfo = new _parse_lockinfo("php://input");
if (!$lockinfo->success) {
$this->http_status("400 bad request");
}
// check if locking is possible
if (!$this->_check_lock_status($this->path, $lockinfo->lockscope === "shared")) {
$this->http_status("423 Locked");
return;
}
// new lock
$options["scope"] = $lockinfo->lockscope;
$options["type"] = $lockinfo->locktype;
$options["owner"] = $lockinfo->owner;
$options["locktoken"] = $this->_new_locktoken();
$stat = $this->LOCK($options);
}
if (is_bool($stat)) {
$http_stat = $stat ? "200 OK" : "423 Locked";
} else {
$http_stat = $stat;
}
$this->http_status($http_stat);
if ($http_stat{0} == 2) { // 2xx states are ok
if ($options["timeout"]) {
// more than a million is considered an absolute timestamp
// less is more likely a relative value
if ($options["timeout"]>1000000) {
$timeout = "Second-".($options['timeout']-time());
} else {
$timeout = "Second-$options[timeout]";
}
} else {
$timeout = "Infinite";
}
header('Content-Type: text/xml; charset="utf-8"');
header("Lock-Token: <$options[locktoken]>");
echo "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
echo "<D:prop xmlns:D=\"DAV:\">\n";
echo " <D:lockdiscovery>\n";
echo " <D:activelock>\n";
echo " <D:lockscope><D:$options[scope]/></D:lockscope>\n";
echo " <D:locktype><D:$options[type]/></D:locktype>\n";
echo " <D:depth>$options[depth]</D:depth>\n";
echo " <D:owner>$options[owner]</D:owner>\n";
echo " <D:timeout>$timeout</D:timeout>\n";
echo " <D:locktoken><D:href>$options[locktoken]</D:href></D:locktoken>\n";
echo " </D:activelock>\n";
echo " </D:lockdiscovery>\n";
echo "</D:prop>\n\n";
}
}
// }}}
// {{{ http_UNLOCK()
/**
* UNLOCK method handler
*
* @param void
* @return void
*/
function http_UNLOCK()
{
$options = Array();
$options["path"] = $this->path;
if (isset($this->_SERVER['HTTP_DEPTH'])) {
$options["depth"] = $this->_SERVER["HTTP_DEPTH"];
} else {
$options["depth"] = "infinity";
}
// strip surrounding <>
$options["token"] = substr(trim($this->_SERVER["HTTP_LOCK_TOKEN"]), 1, -1);
// call user method
$stat = $this->UNLOCK($options);
$this->http_status($stat);
}
// }}}
// }}}
// {{{ _copymove()
function _copymove($what)
{
$options = Array();
$options["path"] = $this->path;
if (isset($this->_SERVER["HTTP_DEPTH"])) {
$options["depth"] = $this->_SERVER["HTTP_DEPTH"];
} else {
$options["depth"] = "infinity";
}
extract(parse_url($this->_SERVER["HTTP_DESTINATION"]));
$path = urldecode($path);
$http_host = $host;
if (isset($port) && $port != 80)
$http_host.= ":$port";
$http_header_host = preg_replace("/:80$/", "", $this->_SERVER["HTTP_HOST"]);
if ($http_host == $http_header_host &&
!strncmp($this->_SERVER["SCRIPT_NAME"], $path,
strlen($this->_SERVER["SCRIPT_NAME"]))) {
$options["dest"] = substr($path, strlen($this->_SERVER["SCRIPT_NAME"]));
if (!$this->_check_lock_status($options["dest"])) {
$this->http_status("423 Locked");
return;
}
} else {
$options["dest_url"] = $this->_SERVER["HTTP_DESTINATION"];
}
// see RFC 2518 Sections 9.6, 8.8.4 and 8.9.3
if (isset($this->_SERVER["HTTP_OVERWRITE"])) {
$options["overwrite"] = $this->_SERVER["HTTP_OVERWRITE"] == "T";
} else {
$options["overwrite"] = true;
}
$stat = $this->$what($options);
$this->http_status($stat);
}
// }}}
// {{{ _allow()
/**
* check for implemented HTTP methods
*
* @param void
* @return array something
*/
function _allow()
{
// OPTIONS is always there
$allow = array("OPTIONS" =>"OPTIONS");
// all other METHODS need both a http_method() wrapper
// and a method() implementation
// the base class supplies wrappers only
foreach (get_class_methods($this) as $method) {
if (!strncmp("http_", $method, 5)) {
$method = strtoupper(substr($method, 5));
if (method_exists($this, $method)) {
$allow[$method] = $method;
}
}
}
// we can emulate a missing HEAD implemetation using GET
if (isset($allow["GET"]))
$allow["HEAD"] = "HEAD";
// no LOCK without checklok()
if (!method_exists($this, "checklock")) {
unset($allow["LOCK"]);
unset($allow["UNLOCK"]);
}
return $allow;
}
// }}}
/**
* helper for property element creation
*
* @param string XML namespace (optional)
* @param string property name
* @param string property value
* @return array property array
*/
function mkprop()
{
$args = func_get_args();
if (count($args) == 3) {
return array("ns" => $args[0],
"name" => $args[1],
"val" => $args[2]);
} else {
return array("ns" => "DAV:",
"name" => $args[0],
"val" => $args[1]);
}
}
// {{{ _check_auth
/**
* check authentication if check is implemented
*
* @param void
* @return bool true if authentication succeded or not necessary
*/
function _check_auth()
{
if (method_exists($this, "checkAuth")) {
// PEAR style method name
return $this->checkAuth(@$this->_SERVER["AUTH_TYPE"],
@$this->_SERVER["PHP_AUTH_USER"],
@$this->_SERVER["PHP_AUTH_PW"]);
} else if (method_exists($this, "check_auth")) {
// old (pre 1.0) method name
return $this->check_auth(@$this->_SERVER["AUTH_TYPE"],
@$this->_SERVER["PHP_AUTH_USER"],
@$this->_SERVER["PHP_AUTH_PW"]);
} else {
// no method found -> no authentication required
return true;
}
}
// }}}
// {{{ UUID stuff
/**
* generate Unique Universal IDentifier for lock token
*
* @param void
* @return string a new UUID
*/
function _new_uuid()
{
// use uuid extension from PECL if available
if (function_exists("uuid_create")) {
return uuid_create();
}
// fallback
$uuid = md5(microtime().getmypid()); // this should be random enough for now
// set variant and version fields for 'true' random uuid
$uuid{12} = "4";
$n = 8 + (ord($uuid{16}) & 3);
$hex = "0123456789abcdef";
$uuid{16} = $hex{$n};
// return formated uuid
return substr($uuid, 0, 8)."-"
. substr($uuid, 8, 4)."-"
. substr($uuid, 12, 4)."-"
. substr($uuid, 16, 4)."-"
. substr($uuid, 20);
}
/**
* create a new opaque lock token as defined in RFC2518
*
* @param void
* @return string new RFC2518 opaque lock token
*/
function _new_locktoken()
{
return "opaquelocktoken:".$this->_new_uuid();
}
// }}}
// {{{ WebDAV If: header parsing
/**
*
*
* @param string header string to parse
* @param int current parsing position
* @return array next token (type and value)
*/
function _if_header_lexer($string, &$pos)
{
// skip whitespace
while (ctype_space($string{$pos})) {
++$pos;
}
// already at end of string?
if (strlen($string) <= $pos) {
return false;
}
// get next character
$c = $string{$pos++};
// now it depends on what we found
switch ($c) {
case "<":
// URIs are enclosed in <...>
$pos2 = strpos($string, ">", $pos);
$uri = substr($string, $pos, $pos2 - $pos);
$pos = $pos2 + 1;
return array("URI", $uri);
case "[":
//Etags are enclosed in [...]
if ($string{$pos} == "W") {
$type = "ETAG_WEAK";
$pos += 2;
} else {
$type = "ETAG_STRONG";
}
$pos2 = strpos($string, "]", $pos);
$etag = substr($string, $pos + 1, $pos2 - $pos - 2);
$pos = $pos2 + 1;
return array($type, $etag);
case "N":
// "N" indicates negation
$pos += 2;
return array("NOT", "Not");
default:
// anything else is passed verbatim char by char
return array("CHAR", $c);
}
}
/**
* parse If: header
*
* @param string header string
* @return array URIs and their conditions
*/
function _if_header_parser($str)
{
$pos = 0;
$len = strlen($str);
$uris = array();
// parser loop
while ($pos < $len) {
// get next token
$token = $this->_if_header_lexer($str, $pos);
// check for URI
if ($token[0] == "URI") {
$uri = $token[1]; // remember URI
$token = $this->_if_header_lexer($str, $pos); // get next token
} else {
$uri = "";
}
// sanity check
if ($token[0] != "CHAR" || $token[1] != "(") {
return false;
}
$list = array();
$level = 1;
$not = "";
while ($level) {
$token = $this->_if_header_lexer($str, $pos);
if ($token[0] == "NOT") {
$not = "!";
continue;
}
switch ($token[0]) {
case "CHAR":
switch ($token[1]) {
case "(":
$level++;
break;
case ")":
$level--;
break;
default:
return false;
}
break;
case "URI":
$list[] = $not."<$token[1]>";
break;
case "ETAG_WEAK":
$list[] = $not."[W/'$token[1]']>";
break;
case "ETAG_STRONG":
$list[] = $not."['$token[1]']>";
break;
default:
return false;
}
$not = "";
}
if (@is_array($uris[$uri])) {
$uris[$uri] = array_merge($uris[$uri], $list);
} else {
$uris[$uri] = $list;
}
}
return $uris;
}
/**
* check if conditions from "If:" headers are meat
*
* the "If:" header is an extension to HTTP/1.1
* defined in RFC 2518 section 9.4
*
* @param void
* @return void
*/
function _check_if_header_conditions()
{
if (isset($this->_SERVER["HTTP_IF"])) {
$this->_if_header_uris =
$this->_if_header_parser($this->_SERVER["HTTP_IF"]);
foreach ($this->_if_header_uris as $uri => $conditions) {
if ($uri == "") {
$uri = $this->uri;
}
// all must match
$state = true;
foreach ($conditions as $condition) {
// lock tokens may be free form (RFC2518 6.3)
// but if opaquelocktokens are used (RFC2518 6.4)
// we have to check the format (litmus tests this)
if (!strncmp($condition, "<opaquelocktoken:", strlen("<opaquelocktoken"))) {
if (!preg_match('/^<opaquelocktoken:[[:xdigit:]]{8}-[[:xdigit:]]{4}-[[:xdigit:]]{4}-[[:xdigit:]]{4}-[[:xdigit:]]{12}>$/', $condition)) {
$this->http_status("423 Locked");
return false;
}
}
if (!$this->_check_uri_condition($uri, $condition)) {
$this->http_status("412 Precondition failed");
$state = false;
break;
}
}
// any match is ok
if ($state == true) {
return true;
}
}
return false;
}
return true;
}
/**
* Check a single URI condition parsed from an if-header
*
* Check a single URI condition parsed from an if-header
*
* @abstract
* @param string $uri URI to check
* @param string $condition Condition to check for this URI
* @returns bool Condition check result
*/
function _check_uri_condition($uri, $condition)
{
// not really implemented here,
// implementations must override
// a lock token can never be from the DAV: scheme
// litmus uses DAV:no-lock in some tests
if (!strncmp("<DAV:", $condition, 5)) {
return false;
}
return true;
}
/**
*
*
* @param string path of resource to check
* @param bool exclusive lock?
*/
function _check_lock_status($path, $exclusive_only = false)
{
// FIXME depth -> ignored for now
if (method_exists($this, "checkLock")) {
// is locked?
$lock = $this->checkLock($path);
// ... and lock is not owned?
if (is_array($lock) && count($lock)) {
// FIXME doesn't check uri restrictions yet
if (!isset($this->_SERVER["HTTP_IF"]) || !strstr($this->_SERVER["HTTP_IF"], $lock["token"])) {
if (!$exclusive_only || ($lock["scope"] !== "shared"))
return false;
}
}
}
return true;
}
// }}}
/**
* Generate lockdiscovery reply from checklock() result
*
* @param string resource path to check
* @return string lockdiscovery response
*/
function lockdiscovery($path)
{
// no lock support without checklock() method
if (!method_exists($this, "checklock")) {
return "";
}
// collect response here
$activelocks = "";
// get checklock() reply
$lock = $this->checklock($path);
// generate <activelock> block for returned data
if (is_array($lock) && count($lock)) {
// check for 'timeout' or 'expires'
if (!empty($lock["expires"])) {
$timeout = "Second-".($lock["expires"] - time());
} else if (!empty($lock["timeout"])) {
$timeout = "Second-$lock[timeout]";
} else {
$timeout = "Infinite";
}
// genreate response block
$activelocks.= "
<D:activelock>
<D:lockscope><D:$lock[scope]/></D:lockscope>
<D:locktype><D:$lock[type]/></D:locktype>
<D:depth>$lock[depth]</D:depth>
<D:owner>$lock[owner]</D:owner>
<D:timeout>$timeout</D:timeout>
<D:locktoken><D:href>$lock[token]</D:href></D:locktoken>
</D:activelock>
";
}
// return generated response
return $activelocks;
}
/**
* set HTTP return status and mirror it in a private header
*
* @param string status code and message
* @return void
*/
function http_status($status)
{
// simplified success case
if ($status === true) {
$status = "200 OK";
}
// remember status
$this->_http_status = $status;
// generate HTTP status response
header("HTTP/1.1 $status");
header("X-WebDAV-Status: $status", true);
}
/**
* private minimalistic version of PHP urlencode()
*
* only blanks and XML special chars must be encoded here
* full urlencode() encoding confuses some clients ...
*
* @param string URL to encode
* @return string encoded URL
*/
function _urlencode($url)
{
return strtr($url, array(" "=>"%20",
"&"=>"%26",
"<"=>"%3C",
">"=>"%3E",
));
}
/**
* private version of PHP urldecode
*
* not really needed but added for completenes
*
* @param string URL to decode
* @return string decoded URL
*/
function _urldecode($path)
{
return urldecode($path);
}
/**
* UTF-8 encode property values if not already done so
*
* @param string text to encode
* @return string utf-8 encoded text
*/
function _prop_encode($text)
{
switch (strtolower($this->_prop_encoding)) {
case "utf-8":
return $text;
case "iso-8859-1":
case "iso-8859-15":
case "latin-1":
default:
return utf8_encode($text);
}
}
/**
* Slashify - make sure path ends in a slash
*
* @param string directory path
* @returns string directory path wiht trailing slash
*/
function _slashify($path)
{
if ($path[strlen($path)-1] != '/') {
$path = $path."/";
}
return $path;
}
/**
* Unslashify - make sure path doesn't in a slash
*
* @param string directory path
* @returns string directory path wihtout trailing slash
*/
function _unslashify($path)
{
if ($path[strlen($path)-1] == '/') {
$path = substr($path, 0, strlen($path) -1);
}
return $path;
}
/**
* Merge two pathes, make sure there is exactly one slash between them
*
* @param string parent path
* @param string child path
* @return string merged path
*/
function _mergePathes($parent, $child)
{
if ($child{0} == '/') {
return $this->_unslashify($parent).$child;
} else {
return $this->_slashify($parent).$child;
}
}
/**
* mbstring.func_overload save strlen version: counting the bytes not the chars
*
* @param string $str
* @return int
*/
function bytes($str)
{
static $func_overload;
if (is_null($func_overload))
{
$func_overload = @extension_loaded('mbstring') ? ini_get('mbstring.func_overload') : 0;
}
return $func_overload & 2 ? mb_strlen($str,'ascii') : strlen($str);
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
?>
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