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Fehler #332 ยป Filesystem.php

Daniel Roche, 11/08/2016 11:06 AM

 
<?php // $Id: Filesystem.php 246165 2007-11-14 13:43:51Z hholzgra $
/*
+----------------------------------------------------------------------+
| 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 (dirname(__FILE__).'/../Server.php');
require_once (dirname(__FILE__).'/../../../System.php');
/**
* Filesystem access using WebDAV
*
* @access public
* @author Hartmut Holzgraefe <hartmut@php.net>
* @version @package-version@
*/
class HTTP_WebDAV_Server_Filesystem extends HTTP_WebDAV_Server
{
/**
* Root directory for WebDAV access
*
* Defaults to webserver document root (set by ServeRequest)
*
* @access private
* @var string
*/
var $base = "";

/**
* MySQL Host where property and locking information is stored
*
* @access private
* @var string
*/
var $db_host = "localhost";

/**
* MySQL database for property/locking information storage
*
* @access private
* @var string
*/
var $db_name = "webdav";

/**
* MySQL table name prefix
*
* @access private
* @var string
*/
var $db_prefix = "";

/**
* MySQL user for property/locking db access
*
* @access private
* @var string
*/
var $db_user = "root";

/**
* MySQL password for property/locking db access
*
* @access private
* @var string
*/
var $db_passwd = "";

/**
* MySQLI link
*/
var $db_link = NULL;


/**
* Serve a webdav request
*
* @access public
* @param string
*/
function ServeRequest($base = false)
{
// special treatment for litmus compliance test
// reply on its identifier header
// not needed for the test itself but eases debugging
if (isset($this->_SERVER['HTTP_X_LITMUS'])) {
error_log("Litmus test ".$this->_SERVER['HTTP_X_LITMUS']);
header("X-Litmus-reply: ".$this->_SERVER['HTTP_X_LITMUS']);
}

// set root directory, defaults to webserver document root if not set
if ($base) {
$this->base = realpath($base); // TODO throw if not a directory
} else if (!$this->base) {
$this->base = $this->_SERVER['DOCUMENT_ROOT'];
}
// establish connection to property/locking db
$this->db_link = mysqli_connect($this->db_host, $this->db_user, $this->db_passwd) or die(mysqli_error($this->db_link));
mysqli_select_db($this->db_link, $this->db_name) or die(mysqli_error($this->db_link));
// TODO throw on connection problems

// let the base class do all the work
parent::ServeRequest();
}

/**
* No authentication is needed here
*
* @access private
* @param string HTTP Authentication type (Basic, Digest, ...)
* @param string Username
* @param string Password
* @return bool true on successful authentication
*/
function check_auth($type, $user, $pass)
{
return true;
}


/**
* PROPFIND method handler
*
* @param array general parameter passing array
* @param array return array for file properties
* @return bool true on success
*/
function PROPFIND(&$options, &$files)
{
// get absolute fs path to requested resource
$fspath = $this->base . $options["path"];
// sanity check
if (!file_exists($fspath)) {
return false;
}

// prepare property array
$files["files"] = array();

// store information for the requested path itself
$files["files"][] = $this->fileinfo($options["path"]);

// information for contained resources requested?
if (!empty($options["depth"]) && is_dir($fspath) && is_readable($fspath)) {
// make sure path ends with '/'
$options["path"] = $this->_slashify($options["path"]);

// try to open directory
$handle = opendir($fspath);
if ($handle) {
// ok, now get all its contents
while ($filename = readdir($handle)) {
if ($filename != "." && $filename != "..") {
$files["files"][] = $this->fileinfo($options["path"].$filename);
}
}
// TODO recursion needed if "Depth: infinite"
}
}

// ok, all done
return true;
}
/**
* Get properties for a single file/resource
*
* @param string resource path
* @return array resource properties
*/
function fileinfo($path)
{
// map URI path to filesystem path
$fspath = $this->base . $path;

// create result array
$info = array();
// TODO remove slash append code when base clase is able to do it itself
$info["path"] = is_dir($fspath) ? $this->_slashify($path) : $path;
$info["props"] = array();
// no special beautified displayname here ...
$info["props"][] = $this->mkprop("displayname", strtoupper($path));
// creation and modification time
$info["props"][] = $this->mkprop("creationdate", filectime($fspath));
$info["props"][] = $this->mkprop("getlastmodified", filemtime($fspath));

// Microsoft extensions: last access time and 'hidden' status
$info["props"][] = $this->mkprop("lastaccessed", fileatime($fspath));
$info["props"][] = $this->mkprop("ishidden", ('.' === substr(basename($fspath), 0, 1)));

// type and size (caller already made sure that path exists)
if (is_dir($fspath)) {
// directory (WebDAV collection)
$info["props"][] = $this->mkprop("resourcetype", "collection");
$info["props"][] = $this->mkprop("getcontenttype", "httpd/unix-directory");
} else {
// plain file (WebDAV resource)
$info["props"][] = $this->mkprop("resourcetype", "");
if (is_readable($fspath)) {
$info["props"][] = $this->mkprop("getcontenttype", $this->_mimetype($fspath));
} else {
$info["props"][] = $this->mkprop("getcontenttype", "application/x-non-readable");
}
$info["props"][] = $this->mkprop("getcontentlength", filesize($fspath));
}

// get additional properties from database
$query = "SELECT ns, name, value
FROM {$this->db_prefix}properties
WHERE path = '$path'";
$res = mysqli_query($this->db_link, $query);
while ($row = mysqli_fetch_assoc($res)) {
$info["props"][] = $this->mkprop($row["ns"], $row["name"], $row["value"]);
}
mysqli_free_result($res);

return $info;
}

/**
* detect if a given program is found in the search PATH
*
* helper function used by _mimetype() to detect if the
* external 'file' utility is available
*
* @param string program name
* @param string optional search path, defaults to $PATH
* @return bool true if executable program found in path
*/
function _can_execute($name, $path = false)
{
// path defaults to PATH from environment if not set
if ($path === false) {
$path = getenv("PATH");
}
// check method depends on operating system
if (!strncmp(PHP_OS, "WIN", 3)) {
// on Windows an appropriate COM or EXE file needs to exist
$exts = array(".exe", ".com");
$check_fn = "file_exists";
} else {
// anywhere else we look for an executable file of that name
$exts = array("");
$check_fn = "is_executable";
}
// now check the directories in the path for the program
foreach (explode(PATH_SEPARATOR, $path) as $dir) {
// skip invalid path entries
if (!file_exists($dir)) continue;
if (!is_dir($dir)) continue;

// and now look for the file
foreach ($exts as $ext) {
if ($check_fn("$dir/$name".$ext)) return true;
}
}

return false;
}

/**
* try to detect the mime type of a file
*
* @param string file path
* @return string guessed mime type
*/
function _mimetype($fspath)
{
if (is_dir($fspath)) {
// directories are easy
return "httpd/unix-directory";
} else if (function_exists("mime_content_type")) {
// use mime magic extension if available
$mime_type = mime_content_type($fspath);
} else if ($this->_can_execute("file")) {
// it looks like we have a 'file' command,
// lets see it it does have mime support
$fp = popen("file -i '$fspath' 2>/dev/null", "r");
$reply = fgets($fp);
pclose($fp);
// popen will not return an error if the binary was not found
// and find may not have mime support using "-i"
// so we test the format of the returned string
// the reply begins with the requested filename
if (!strncmp($reply, "$fspath: ", strlen($fspath)+2)) {
$reply = substr($reply, strlen($fspath)+2);
// followed by the mime type (maybe including options)
if (preg_match('|^[[:alnum:]_-]+/[[:alnum:]_-]+;?.*|', $reply, $matches)) {
$mime_type = $matches[0];
}
}
}
if (empty($mime_type)) {
// Fallback solution: try to guess the type by the file extension
// TODO: add more ...
// TODO: it has been suggested to delegate mimetype detection
// to apache but this has at least three issues:
// - works only with apache
// - needs file to be within the document tree
// - requires apache mod_magic
// TODO: can we use the registry for this on Windows?
// OTOH if the server is Windos the clients are likely to
// be Windows, too, and tend do ignore the Content-Type
// anyway (overriding it with information taken from
// the registry)
// TODO: have a seperate PEAR class for mimetype detection?
switch (strtolower(strrchr(basename($fspath), "."))) {
case ".html":
$mime_type = "text/html";
break;
case ".gif":
$mime_type = "image/gif";
break;
case ".jpg":
$mime_type = "image/jpeg";
break;
default:
$mime_type = "application/octet-stream";
break;
}
}
return $mime_type;
}

/**
* HEAD method handler
*
* @param array parameter passing array
* @return bool true on success
*/
function HEAD(&$options)
{
// get absolute fs path to requested resource
$fspath = $this->base . $options["path"];

// sanity check
if (!file_exists($fspath)) return false;
// detect resource type
$options['mimetype'] = $this->_mimetype($fspath);
// detect modification time
// see rfc2518, section 13.7
// some clients seem to treat this as a reverse rule
// requiering a Last-Modified header if the getlastmodified header was set
$options['mtime'] = filemtime($fspath);
// detect resource size
$options['size'] = filesize($fspath);
return true;
}

/**
* GET method handler
*
* @param array parameter passing array
* @return bool true on success
*/
function GET(&$options)
{
// get absolute fs path to requested resource
$fspath = $this->base . $options["path"];

// is this a collection?
if (is_dir($fspath)) {
return $this->GetDir($fspath, $options);
}

// the header output is the same as for HEAD
if (!$this->HEAD($options)) {
return false;
}

// no need to check result here, it is handled by the base class
$options['stream'] = fopen($fspath, "r");
return true;
}

/**
* GET method handler for directories
*
* This is a very simple mod_index lookalike.
* See RFC 2518, Section 8.4 on GET/HEAD for collections
*
* @param string directory path
* @return void function has to handle HTTP response itself
*/
function GetDir($fspath, &$options)
{
$path = $this->_slashify($options["path"]);
if ($path != $options["path"]) {
header("Location: ".$this->base_uri.$path);
exit;
}

// fixed width directory column format
$format = "%15s %-19s %-s\n";

if (!is_readable($fspath)) {
return false;
}

$handle = opendir($fspath);
if (!$handle) {
return false;
}

echo "<html><head><title>Index of ".htmlspecialchars($options['path'])."</title></head>\n";
echo "<h1>Index of ".htmlspecialchars($options['path'])."</h1>\n";
echo "<pre>";
printf($format, "Size", "Last modified", "Filename");
echo "<hr>";

while ($filename = readdir($handle)) {
if ($filename != "." && $filename != "..") {
$fullpath = $fspath."/".$filename;
$name = htmlspecialchars($filename);
printf($format,
number_format(filesize($fullpath)),
strftime("%Y-%m-%d %H:%M:%S", filemtime($fullpath)),
"<a href='$name'>$name</a>");
}
}

echo "</pre>";

closedir($handle);

echo "</html>\n";

exit;
}

/**
* PUT method handler
*
* @param array parameter passing array
* @return bool true on success
*/
function PUT(&$options)
{
$fspath = $this->base . $options["path"];

$dir = dirname($fspath);
if (!file_exists($dir) || !is_dir($dir)) {
return "409 Conflict"; // TODO right status code for both?
}

$options["new"] = ! file_exists($fspath);

if ($options["new"] && !is_writeable($dir)) {
return "403 Forbidden";
}
if (!$options["new"] && !is_writeable($fspath)) {
return "403 Forbidden";
}
if (!$options["new"] && is_dir($fspath)) {
return "403 Forbidden";
}

$fp = fopen($fspath, "w");

return $fp;
}


/**
* MKCOL method handler
*
* @param array general parameter passing array
* @return bool true on success
*/
function MKCOL($options)
{
$path = $this->base .$options["path"];
$parent = dirname($path);
$name = basename($path);

if (!file_exists($parent)) {
return "409 Conflict";
}

if (!is_dir($parent)) {
return "403 Forbidden";
}

if ( file_exists($parent."/".$name) ) {
return "405 Method not allowed";
}

if (!empty($this->_SERVER["CONTENT_LENGTH"])) { // no body parsing yet
return "415 Unsupported media type";
}
$stat = mkdir($parent."/".$name, 0777);
if (!$stat) {
return "403 Forbidden";
}

return ("201 Created");
}
/**
* DELETE method handler
*
* @param array general parameter passing array
* @return bool true on success
*/
function DELETE($options)
{
$path = $this->base . "/" .$options["path"];

if (!file_exists($path)) {
return "404 Not found";
}

if (is_dir($path)) {
$query = "DELETE FROM {$this->db_prefix}properties
WHERE path LIKE '".$this->_slashify($options["path"])."%'";
mysqli_query($this->db_link,$query);
System::rm(array("-rf", $path));
} else {
unlink($path);
}
$query = "DELETE FROM {$this->db_prefix}properties
WHERE path = '$options[path]'";
mysqli_query($this->db_link,$query);

return "204 No Content";
}


/**
* MOVE method handler
*
* @param array general parameter passing array
* @return bool true on success
*/
function MOVE($options)
{
return $this->COPY($options, true);
}

/**
* COPY method handler
*
* @param array general parameter passing array
* @return bool true on success
*/
function COPY($options, $del=false)
{
// TODO Property updates still broken (Litmus should detect this?)

if (!empty($this->_SERVER["CONTENT_LENGTH"])) { // no body parsing yet
return "415 Unsupported media type";
}

// no copying to different WebDAV Servers yet
if (isset($options["dest_url"])) {
return "502 bad gateway";
}

$source = $this->base . $options["path"];
if (!file_exists($source)) {
return "404 Not found";
}

if (is_dir($source)) { // resource is a collection
switch ($options["depth"]) {
case "infinity": // valid
break;
case "0": // valid for COPY only
if ($del) { // MOVE?
return "400 Bad request";
}
break;
case "1": // invalid for both COPY and MOVE
default:
return "400 Bad request";
}
}

$dest = $this->base . $options["dest"];
$destdir = dirname($dest);
if (!file_exists($destdir) || !is_dir($destdir)) {
return "409 Conflict";
}


$new = !file_exists($dest);
$existing_col = false;

if (!$new) {
if ($del && is_dir($dest)) {
if (!$options["overwrite"]) {
return "412 precondition failed";
}
$dest .= basename($source);
if (file_exists($dest)) {
$options["dest"] .= basename($source);
} else {
$new = true;
$existing_col = true;
}
}
}

if (!$new) {
if ($options["overwrite"]) {
$stat = $this->DELETE(array("path" => $options["dest"]));
if (($stat{0} != "2") && (substr($stat, 0, 3) != "404")) {
return $stat;
}
} else {
return "412 precondition failed";
}
}

if ($del) {
if (!rename($source, $dest)) {
return "500 Internal server error";
}
$destpath = $this->_unslashify($options["dest"]);
if (is_dir($source)) {
$query = "UPDATE {$this->db_prefix}properties
SET path = REPLACE(path, '".$options["path"]."', '".$destpath."')
WHERE path LIKE '".$this->_slashify($options["path"])."%'";
mysqli_query($this->db_link,$query);
}

$query = "UPDATE {$this->db_prefix}properties
SET path = '".$destpath."'
WHERE path = '".$options["path"]."'";
mysqli_query($this->db_link,$query);
} else {
if (is_dir($source)) {
$files = System::find($source);
$files = array_reverse($files);
} else {
$files = array($source);
}

if (!is_array($files) || empty($files)) {
return "500 Internal server error";
}
foreach ($files as $file) {
if (is_dir($file)) {
$file = $this->_slashify($file);
}

$destfile = str_replace($source, $dest, $file);
if (is_dir($file)) {
if (!file_exists($destfile)) {
if (!is_writeable(dirname($destfile))) {
return "403 Forbidden";
}
if (!mkdir($destfile)) {
return "409 Conflict";
}
} else if (!is_dir($destfile)) {
return "409 Conflict";
}
} else {
if (!copy($file, $destfile)) {
return "409 Conflict";
}
}
}

$query = "INSERT INTO {$this->db_prefix}properties
SELECT *
FROM {$this->db_prefix}properties
WHERE path = '".$options['path']."'";
}

return ($new && !$existing_col) ? "201 Created" : "204 No Content";
}

/**
* PROPPATCH method handler
*
* @param array general parameter passing array
* @return bool true on success
*/
function PROPPATCH(&$options)
{
global $prefs, $tab;

$msg = "";
$path = $options["path"];
$dir = dirname($path)."/";
$base = basename($path);
foreach ($options["props"] as $key => $prop) {
if ($prop["ns"] == "DAV:") {
$options["props"][$key]['status'] = "403 Forbidden";
} else {
if (isset($prop["val"])) {
$query = "REPLACE INTO {$this->db_prefix}properties
SET path = '$options[path]'
, name = '$prop[name]'
, ns= '$prop[ns]'
, value = '$prop[val]'";
} else {
$query = "DELETE FROM {$this->db_prefix}properties
WHERE path = '$options[path]'
AND name = '$prop[name]'
AND ns = '$prop[ns]'";
}
mysqli_query($this->db_link,$query);
}
}
return "";
}


/**
* LOCK method handler
*
* @param array general parameter passing array
* @return bool true on success
*/
function LOCK(&$options)
{
// get absolute fs path to requested resource
$fspath = $this->base . $options["path"];

// TODO recursive locks on directories not supported yet
// makes litmus test "32. lock_collection" fail
if (is_dir($fspath) && !empty($options["depth"])) {
return "409 Conflict";
}

$options["timeout"] = time()+300; // 5min. hardcoded

if (isset($options["update"])) { // Lock Update
$where = "WHERE path = '$options[path]' AND token = '$options[update]'";

$query = "SELECT owner, exclusivelock FROM {$this->db_prefix}locks $where";
$res = mysqli_query($this->db_link,$query);
$row = mysqli_fetch_assoc($res);
mysqli_free_result($res);

if (is_array($row)) {
$query = "UPDATE {$this->db_prefix}locks
SET expires = '$options[timeout]'
, modified = ".time()."
$where";
mysqli_query($this->db_link,$query);

$options['owner'] = $row['owner'];
$options['scope'] = $row["exclusivelock"] ? "exclusive" : "shared";
$options['type'] = $row["exclusivelock"] ? "write" : "read";

return true;
} else {
return false;
}
}
$query = "INSERT INTO {$this->db_prefix}locks
SET token = '$options[locktoken]'
, path = '$options[path]'
, created = ".time()."
, modified = ".time()."
, owner = '$options[owner]'
, expires = '$options[timeout]'
, exclusivelock = " .($options['scope'] === "exclusive" ? "1" : "0")
;
mysqli_query($this->db_link,$query);

return mysqli_affected_rows() ? "200 OK" : "409 Conflict";
}

/**
* UNLOCK method handler
*
* @param array general parameter passing array
* @return bool true on success
*/
function UNLOCK(&$options)
{
$query = "DELETE FROM {$this->db_prefix}locks
WHERE path = '$options[path]'
AND token = '$options[token]'";
mysqli_query($this->db_link,$query);

return mysqli_affected_rows() ? "204 No Content" : "409 Conflict";
}

/**
* checkLock() helper
*
* @param string resource path to check for locks
* @return bool true on success
*/
function checkLock($path)
{
$result = false;
$query = "SELECT owner, token, created, modified, expires, exclusivelock
FROM {$this->db_prefix}locks
WHERE path = '$path'
";
$res = mysqli_query($this->db_link,$query);

if ($res) {
$row = mysqli_fetch_array($res);
mysqli_free_result($res);

if ($row) {
$result = array( "type" => "write",
"scope" => $row["exclusivelock"] ? "exclusive" : "shared",
"depth" => 0,
"owner" => $row['owner'],
"token" => $row['token'],
"created" => $row['created'],
"modified" => $row['modified'],
"expires" => $row['expires']
);
}
}

return $result;
}


/**
* create database tables for property and lock storage
*
* @param void
* @return bool true on success
*/
function create_database()
{
// TODO
return false;
}
}


/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode:nil
* End:
*/
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