--- /dev/null
+<?php // $Id$
+/*
+ +----------------------------------------------------------------------+
+ | Copyright (c) 2002-2007 Christian Stocker, Hartmut Holzgraefe |
+ | All rights reserved |
+ | |
+ | Redistribution and use in source and binary forms, with or without |
+ | modification, are permitted provided that the following conditions |
+ | are met: |
+ | |
+ | 1. Redistributions of source code must retain the above copyright |
+ | notice, this list of conditions and the following disclaimer. |
+ | 2. Redistributions in binary form must reproduce the above copyright |
+ | notice, this list of conditions and the following disclaimer in |
+ | the documentation and/or other materials provided with the |
+ | distribution. |
+ | 3. The names of the authors may not be used to endorse or promote |
+ | products derived from this software without specific prior |
+ | written permission. |
+ | |
+ | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
+ | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
+ | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
+ | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
+ | COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
+ | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
+ | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
+ | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
+ | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
+ | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
+ | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
+ | POSSIBILITY OF SUCH DAMAGE. |
+ +----------------------------------------------------------------------+
+*/
+
+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
+ $uri = "http";
+ if (isset($this->_SERVER["HTTPS"]) && $this->_SERVER["HTTPS"] === "on") {
+ $uri = "https";
+ }
+ $uri.= "://".$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 $reqprop) {
+ if (!isset($reqprop["xmlns"])) {
+ $reqprop["xmlns"] = "";
+ }
+ 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
+
+ $found = false;
+
+ if (!isset($reqprop["xmlns"])) {
+ $reqprop["xmlns"] = "";
+ }
+
+ // check if property exists in result
+ foreach ($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;
+ // the following are non-standard Microsoft extensions to the DAV namespace
+ case "lastaccessed":
+ echo " <D:lastaccessed ns0:dt=\"dateTime.rfc1123\">"
+ . gmdate("D, d M Y H:i:s ", $prop['val'])
+ . "GMT</D:lastaccessed>\n";
+ break;
+ case "ishidden":
+ echo " <D:ishidden>"
+ . is_string($prop['val']) ? $prop['val'] : ($prop['val'] ? 'true' : 'false')
+ . "</D:ishidden>\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"]) {
+ // if multiple timeout values were given we take the first only
+ if (is_array($options["timeout"])) {
+ reset($options["timeout"]);
+ $options["timeout"] = current($options["timeout"]);
+ }
+ // if the timeout is numeric only we need to reformat it
+ if (is_numeric($options["timeout"])) {
+ // more than a million is considered an absolute timestamp
+ // less is more likely a relative value
+ if ($options["timeout"]>1000000) {
+ $timeout = "Second-".($options['timeout']-time());
+ } else {
+ $timeout = "Second-$options[timeout]";
+ }
+ } else {
+ // non-numeric values are passed on verbatim,
+ // no error checking is performed here in this case
+ // TODO: send "Infinite" on invalid timeout strings?
+ $timeout = $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";
+ }
+
+ $http_header_host = preg_replace("/:80$/", "", $this->_SERVER["HTTP_HOST"]);
+
+ $url = parse_url($this->_SERVER["HTTP_DESTINATION"]);
+ $path = urldecode($url["path"]);
+
+ if (isset($url["host"])) {
+ // TODO check url scheme, too
+ $http_host = $url["host"];
+ if (isset($url["port"]) && $url["port"] != 80)
+ $http_host.= ":".$url["port"];
+ } else {
+ // only path given, set host to self
+ $http_host == $http_header_host;
+ }
+
+ if ($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()
+ {
+ $auth_type = isset($this->_SERVER["AUTH_TYPE"])
+ ? $this->_SERVER["AUTH_TYPE"]
+ : null;
+
+ $auth_user = isset($this->_SERVER["PHP_AUTH_USER"])
+ ? $this->_SERVER["PHP_AUTH_USER"]
+ : null;
+
+ $auth_pw = isset($this->_SERVER["PHP_AUTH_PW"])
+ ? $this->_SERVER["PHP_AUTH_PW"]
+ : null;
+
+ if (method_exists($this, "checkAuth")) {
+ // PEAR style method name
+ return $this->checkAuth($auth_type, $auth_user, $auth_pw);
+ } else if (method_exists($this, "check_auth")) {
+ // old (pre 1.0) method name
+ return $this->check_auth($auth_type, $auth_user, $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;
+ }
+ $not = "";
+ }
+
+ if (isset($uris[$uri]) && is_array($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:
+ */
+?>
projects / moodle.git / commitdiff