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index.php
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<?php
namespace KD2\WebDAV
{
class Exception extends \RuntimeException {}
class Server
{
// List of basic DAV properties that you should return if $requested_properties is NULL
const BASIC_PROPERTIES = [
'DAV::resourcetype', // should be empty for files, and 'collection' for directories
'DAV::getcontenttype', // MIME type
'DAV::getlastmodified', // File modification date (must be \DateTimeInterface)
'DAV::getcontentlength', // file size
'DAV::displayname', // File name for display
];
const EXTENDED_PROPERTIES = [
'DAV::getetag',
'DAV::creationdate',
'DAV::lastaccessed',
'DAV::ishidden', // Microsoft thingy
'DAV::quota-used-bytes',
'DAV::quota-available-bytes',
];
const PROP_NAMESPACE_MICROSOFT = 'urn:schemas-microsoft-com:';
const MODIFICATION_TIME_PROPERTIES = [
'DAV::lastmodified',
'DAV::creationdate',
'DAV::getlastmodified',
'urn:schemas-microsoft-com::Win32LastModifiedTime',
'urn:schemas-microsoft-com::Win32CreationTime',
];
// Custom properties
const PROP_DIGEST_MD5 = 'urn:karadav:digest_md5';
const EMPTY_PROP_VALUE = 'DAV::empty';
const SHARED_LOCK = 'shared';
const EXCLUSIVE_LOCK = 'exclusive';
protected bool $enable_gzip = true;
protected string $base_uri;
public string $original_uri;
public string $prefix = '';
protected AbstractStorage $storage;
public function setStorage(AbstractStorage $storage)
{
$this->storage = $storage;
}
public function getStorage(): AbstractStorage
{
return $this->storage;
}
public function setBaseURI(string $uri): void
{
$this->base_uri = '/' . ltrim($uri, '/');
$this->base_uri = rtrim($this->base_uri, '/') . '/';
}
protected function extendExecutionTime(): void
{
if (false === strpos(@ini_get('disable_functions'), 'set_time_limit')) {
@set_time_limit(3600);
}
@ini_set('max_execution_time', '3600');
@ini_set('max_input_time', '3600');
}
protected function _prefix(string $uri): string
{
if (!$this->prefix) {
return $uri;
}
return rtrim(rtrim($this->prefix, '/') . '/' . ltrim($uri, '/'), '/');
}
protected function html_directory(string $uri, iterable $list): ?string
{
// Not a file: let's serve a directory listing if you are browsing with a web browser
if (substr($this->original_uri, -1) != '/') {
http_response_code(301);
header(sprintf('Location: /%s/', trim($this->base_uri . $uri, '/')), true);
return null;
}
$out = sprintf('<!DOCTYPE html><html data-webdav-url="%s"><head><meta name="viewport" content="width=device-width, initial-scale=1.0, target-densitydpi=device-dpi" /><style>
body { font-size: 1.1em; font-family: Arial, Helvetica, sans-serif; }
table { border-collapse: collapse; }
th, td { padding: .5em; text-align: left; border: 2px solid #ccc; }
span { font-size: 40px; line-height: 40px; }
</style>', '/' . ltrim($this->base_uri, '/'));
$out .= sprintf('<title>%s</title></head><body><h1>%1$s</h1><table>', htmlspecialchars($uri ? str_replace('/', ' / ', $uri) . ' - Files' : 'Files'));
if (trim($uri)) {
$out .= '<tr><th colspan=3><a href="../"><b>Back</b></a></th></tr>';
}
$props = null;
foreach ($list as $file => $props) {
if (null === $props) {
$props = $this->storage->propfind(trim($uri . '/' . $file, '/'), self::BASIC_PROPERTIES, 0);
}
$collection = !empty($props['DAV::resourcetype']) && $props['DAV::resourcetype'] == 'collection';
if ($collection) {
$out .= sprintf('<tr><td>[DIR]</td><th><a href="%s/"><b>%s</b></a></th></tr>', rawurlencode($file), htmlspecialchars($file));
}
else {
$size = $props['DAV::getcontentlength'];
if ($size > 1024*1024) {
$size = sprintf('%d MB', $size / 1024 / 1024);
}
elseif ($size) {
$size = sprintf('%d KB', $size / 1024);
}
$date = $props['DAV::getlastmodified'];
if ($date instanceof \DateTimeInterface) {
$date = $date->format('d/m/Y H:i');
}
$out .= sprintf('<tr><td></td><th><a href="%s">%s</a></th><td>%s</td><td>%s</td></tr>',
rawurlencode($file),
htmlspecialchars($file),
$size,
$date
);
}
}
$out .= '</table>';
if (null === $props) {
$out .= '<p>This directory is empty.</p>';
}
$out .= '</body></html>';
return $out;
}
public function http_delete(string $uri): ?string
{
// check RFC 2518 Section 9.2, last paragraph
if (isset($_SERVER['HTTP_DEPTH']) && $_SERVER['HTTP_DEPTH'] != 'infinity') {
throw new Exception('We can only delete to infinity', 400);
}
$uri = $this->_prefix($uri);
$this->checkLock($uri);
$this->storage->delete($uri);
if ($token = $this->getLockToken()) {
$this->storage->unlock($uri, $token);
}
http_response_code(204);
header('Content-Length: 0', true);
return null;
}
public function http_put(string $uri): ?string
{
if (!empty($_SERVER['HTTP_CONTENT_TYPE']) && !strncmp($_SERVER['HTTP_CONTENT_TYPE'], 'multipart/', 10)) {
throw new Exception('Multipart PUT requests are not supported', 501);
}
if (!empty($_SERVER['HTTP_CONTENT_ENCODING'])) {
if (false !== strpos($_SERVER['HTTP_CONTENT_ENCODING'], 'gzip')) {
// Might be supported later?
throw new Exception('Content Encoding is not supported', 501);
}
else {
throw new Exception('Content Encoding is not supported', 501);
}
}
if (!empty($_SERVER['HTTP_CONTENT_RANGE'])) {
throw new Exception('Content Range is not supported', 501);
}
// See SabreDAV CorePlugin for reason why OS/X Finder is buggy
if (isset($_SERVER['HTTP_X_EXPECTED_ENTITY_LENGTH'])) {
throw new Exception('This server is not compatible with OS/X finder. Consider using a different WebDAV client or webserver.', 403);
}
$hash = null;
$hash_algo = null;
// Support for checksum matching
// https://dcache.org/old/manuals/UserGuide-6.0/webdav.shtml#checksums
if (!empty($_SERVER['HTTP_CONTENT_MD5'])) {
$hash = bin2hex(base64_decode($_SERVER['HTTP_CONTENT_MD5']));
$hash_algo = 'MD5';
}
// Support for ownCloud/NextCloud checksum
// https://github.com/owncloud-archive/documentation/issues/2964
elseif (!empty($_SERVER['HTTP_OC_CHECKSUM'])
&& preg_match('/MD5:[a-f0-9]{32}|SHA1:[a-f0-9]{40}/', $_SERVER['HTTP_OC_CHECKSUM'], $match)) {
$hash_algo = strtok($match[0], ':');
$hash = strtok('');
}
$uri = $this->_prefix($uri);
$this->checkLock($uri);
if (!empty($_SERVER['HTTP_IF_MATCH'])) {
$etag = trim($_SERVER['HTTP_IF_MATCH'], '" ');
$prop = $this->storage->propfind($uri, ['DAV::getetag'], 0);
if (!empty($prop['DAV::getetag']) && $prop['DAV::getetag'] != $etag) {
throw new Exception('ETag did not match condition', 412);
}
}
// Specific to NextCloud/ownCloud, to allow setting file mtime
// This expects a UNIX timestamp
$mtime = (int)($_SERVER['HTTP_X_OC_MTIME'] ?? 0) ?: null;
$this->extendExecutionTime();
$stream = fopen('php://input', 'r');
// mod_fcgid <= 2.3.9 doesn't handle chunked transfer encoding for PUT requests
// see https://github.com/kd2org/picodav/issues/6
if (strstr($_SERVER['HTTP_TRANSFER_ENCODING'] ?? '', 'chunked') && PHP_SAPI == 'fpm-fcgi') {
// We can't seek here
// see https://github.com/php/php-src/issues/9441
$l = strlen(fread($stream, 1));
if ($l === 0) {
throw new Exception('This server cannot accept "Transfer-Encoding: chunked" uploads (please upgrade to mod_fcgid >= 2.3.10).', 500);
}
// reset stream
fseek($stream, 0, SEEK_SET);
}
$created = $this->storage->put($uri, $stream, $hash_algo, $hash);
if ($mtime) {
$mtime = new \DateTime('@' . $mtime);
if ($this->storage->touch($uri, $mtime)) {
header('X-OC-MTime: accepted');
}
}
$prop = $this->storage->propfind($uri, ['DAV::getetag'], 0);
if (!empty($prop['DAV::getetag'])) {
$value = $prop['DAV::getetag'];
if (substr($value, 0, 1) != '"') {
$value = '"' . $value . '"';
}
header(sprintf('ETag: %s', $value));
}
http_response_code($created ? 201 : 204);
return null;
}
public function http_head(string $uri, array &$props = []): ?string
{
$uri = $this->_prefix($uri);
$requested_props = self::BASIC_PROPERTIES;
$requested_props[] = 'DAV::getetag';
// RFC 3230 https://www.rfc-editor.org/rfc/rfc3230.html
if (!empty($_SERVER['HTTP_WANT_DIGEST'])) {
$requested_props[] = self::PROP_DIGEST_MD5;
}
$props = $this->storage->propfind($uri, $requested_props, 0);
if (!$props) {
throw new Exception('Resource Not Found', 404);
}
http_response_code(200);
if (isset($props['DAV::getlastmodified'])
&& $props['DAV::getlastmodified'] instanceof \DateTimeInterface) {
header(sprintf('Last-Modified: %s', $props['DAV::getlastmodified']->format(\DATE_RFC7231)));
}
if (!empty($props['DAV::getetag'])) {
$value = $props['DAV::getetag'];
if (substr($value, 0, 1) != '"') {
$value = '"' . $value . '"';
}
header(sprintf('ETag: %s', $value));
}
if (empty($props['DAV::resourcetype']) || $props['DAV::resourcetype'] != 'collection') {
if (!empty($props['DAV::getcontenttype'])) {
header(sprintf('Content-Type: %s', $props['DAV::getcontenttype']));
}
if (!empty($props['DAV::getcontentlength'])) {
header(sprintf('Content-Length: %d', $props['DAV::getcontentlength']));
header('Accept-Ranges: bytes');
}
}
if (!empty($props[self::PROP_DIGEST_MD5])) {
header(sprintf('Digest: md5=%s', base64_encode(hex2bin($props[self::PROP_DIGEST_MD5]))));
}
return null;
}
public function http_get(string $uri): ?string
{
$props = [];
$this->http_head($uri, $props);
$uri = $this->_prefix($uri);
$is_collection = !empty($props['DAV::resourcetype']) && $props['DAV::resourcetype'] == 'collection';
$out = '';
if ($is_collection) {
$list = $this->storage->list($uri, self::BASIC_PROPERTIES);
if (!isset($_SERVER['HTTP_ACCEPT']) || false === strpos($_SERVER['HTTP_ACCEPT'], 'html')) {
$list = is_array($list) ? $list : iterator_to_array($list);
if (!count($list)) {
return "Nothing in this collection\n";
}
return implode("\n", array_keys($list));
}
header('Content-Type: text/html; charset=utf-8', true);
return $this->html_directory($uri, $list);
}
$file = $this->storage->get($uri);
if (!$file) {
throw new Exception('File Not Found', 404);
}
// If the file was returned to the client by the storage backend, stop here
if (!empty($file['stop'])) {
return null;
}
if (!isset($file['content']) && !isset($file['resource']) && !isset($file['path'])) {
throw new \RuntimeException('Invalid file array returned by ::get(): ' . print_r($file, true));
}
$this->extendExecutionTime();
$length = $start = $end = null;
$gzip = false;
if (isset($_SERVER['HTTP_RANGE'])
&& preg_match('/^bytes=(\d*)-(\d*)$/i', $_SERVER['HTTP_RANGE'], $match)
&& $match[1] . $match[2] !== '') {
$start = $match[1] === '' ? null : (int) $match[1];
$end = $match[2] === '' ? null : (int) $match[2];
if (null !== $start && $start < 0) {
throw new Exception('Start range cannot be satisfied', 416);
}
if (isset($props['DAV::getcontentlength']) && $start > $props['DAV::getcontentlength']) {
throw new Exception('End range cannot be satisfied', 416);
}
$this->log('HTTP Range requested: %s-%s', $start, $end);
}
elseif ($this->enable_gzip
&& isset($_SERVER['HTTP_ACCEPT_ENCODING'])
&& false !== strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')
&& isset($props['DAV::getcontentlength'])
// Don't compress if size is larger than 8 MiB
&& $props['DAV::getcontentlength'] < 8*1024*1024
// Don't compress already compressed content
&& !preg_match('/\.(?:cbz|cbr|cb7|mp4|m4a|zip|docx|xlsx|pptx|ods|odt|odp|7z|gz|bz2|lzma|lz|xz|apk|dmg|jar|rar|webm|ogg|mp3|ogm|flac|ogv|mkv|avi)$/i', $uri)) {
$gzip = true;
header('Content-Encoding: gzip', true);
}
// Try to avoid common issues with output buffering and stuff
if (function_exists('apache_setenv')) {
@apache_setenv('no-gzip', 1);
}
@ini_set('zlib.output_compression', 'Off');
if (@ob_get_length()) {
@ob_clean();
}
if (isset($file['content'])) {
$length = strlen($file['content']);
if ($start || $end) {
if (null !== $end && $end > $length) {
header('Content-Range: bytes */' . $length, true);
throw new Exception('End range cannot be satisfied', 416);
}
if ($start === null) {
$start = $length - $end;
$end = $start + $end;
}
elseif ($end === null) {
$end = $length;
}
http_response_code(206);
header(sprintf('Content-Range: bytes %s-%s/%s', $start, $end - 1, $length));
$file['content'] = substr($file['content'], $start, $end - $start);
$length = $end - $start;
}
if ($gzip) {
$file['content'] = gzencode($file['content'], 9);
$length = strlen($file['content']);
}
header('Content-Length: ' . $length, true);
echo $file['content'];
return null;
}
if (isset($file['path'])) {
$file['resource'] = fopen($file['path'], 'rb');
}
$seek = fseek($file['resource'], 0, SEEK_END);
if ($seek === 0) {
$length = ftell($file['resource']);
fseek($file['resource'], 0, SEEK_SET);
}
if (($start || $end) && $seek === 0) {
if (null !== $end && $end > $length) {
header('Content-Range: bytes */' . $length, true);
throw new Exception('End range cannot be satisfied', 416);
}
if ($start === null) {
$start = $length - $end;
$end = $start + $end;
}
elseif ($end === null) {
$end = $length;
}
fseek($file['resource'], $start, SEEK_SET);
http_response_code(206);
header(sprintf('Content-Range: bytes %s-%s/%s', $start, $end - 1, $length), true);
$length = $end - $start;
$end -= $start;
}
elseif (null === $length && isset($file['path'])) {
$end = $length = filesize($file['path']);
}
if ($gzip) {
$this->log('Using gzip output compression');
$gzip = deflate_init(ZLIB_ENCODING_GZIP);
$fp = fopen('php://temp', 'wb');
while (!feof($file['resource'])) {
fwrite($fp, deflate_add($gzip, fread($file['resource'], 8192), ZLIB_NO_FLUSH));
}
fwrite($fp, deflate_add($gzip, '', ZLIB_FINISH));
$length = ftell($fp);
rewind($fp);
fclose($file['resource']);
$file['resource'] = $fp;
unset($fp);
}
if (null !== $length) {
$this->log('Length: %s', $length);
header('Content-Length: ' . $length, true);
}
$block_size = 8192*4;
while (!feof($file['resource']) && ($end === null || $end > 0)) {
$l = $end !== null ? min($block_size, $end) : $block_size;
echo fread($file['resource'], $l);
flush();
if (null !== $end) {
$end -= $block_size;
}
}
fclose($file['resource']);
return null;
}
public function http_copy(string $uri): ?string
{
return $this->_http_copymove($uri, 'copy');
}
public function http_move(string $uri): ?string
{
return $this->_http_copymove($uri, 'move');
}
protected function _http_copymove(string $uri, string $method): ?string
{
$uri = $this->_prefix($uri);
$destination = $_SERVER['HTTP_DESTINATION'] ?? null;
$depth = $_SERVER['HTTP_DEPTH'] ?? 1;
if (!$destination) {
throw new Exception('Destination not supplied', 400);
}
$destination = $this->getURI($destination);
if (trim($destination, '/') == trim($uri, '/')) {
throw new Exception('Cannot move file to itself', 403);
}
$overwrite = ($_SERVER['HTTP_OVERWRITE'] ?? null) == 'T';
// Dolphin is removing the file name when moving to root directory
if (empty($destination)) {
$destination = basename($uri);
}
$this->log('<= Destination: %s', $destination);
$this->log('<= Overwrite: %s (%s)', $overwrite ? 'Yes' : 'No', $_SERVER['HTTP_OVERWRITE'] ?? null);
if (!$overwrite && $this->storage->exists($destination)) {
throw new Exception('File already exists and overwriting is disabled', 412);
}
if ($method == 'move') {
$this->checkLock($uri);
}
$this->checkLock($destination);
// Moving/copy of directory to an existing destination and depth=0
// should do just nothing, see 'depth_zero_copy' test in litmus
if ($depth == 0
&& $this->storage->exists($destination)
&& current($this->storage->propfind($destination, ['DAV::resourcetype'], 0)) == 'collection') {
$overwritten = $this->storage->exists($uri);
}
else {
$overwritten = $this->storage->$method($uri, $destination);
}
if ($method == 'move' && ($token = $this->getLockToken())) {
$this->storage->unlock($uri, $token);
}
http_response_code($overwritten ? 204 : 201);
return null;
}
public function http_mkcol(string $uri): ?string
{
if (!empty($_SERVER['CONTENT_LENGTH'])) {
throw new Exception('Unsupported body for MKCOL', 415);
}
$uri = $this->_prefix($uri);
$this->storage->mkcol($uri);
http_response_code(201);
return null;
}
protected function extractRequestedProperties(string $body): ?array
{
// We only care about properties if the client asked for it
// If not, we consider that the client just requested to get everything
if (!preg_match('!<(?:\w+:)?propfind!', $body)) {
return null;
}
$ns = [];
$dav_ns = null;
$default_ns = null;
if (preg_match('/<propfind[^>]+xmlns="DAV:"/', $body)) {
$default_ns = 'DAV:';
}
preg_match_all('!xmlns:(\w+)\s*=\s*"([^"]+)"!', $body, $match, PREG_SET_ORDER);
// Find all aliased xmlns
foreach ($match as $found) {
$ns[$found[2]] = $found[1];
}
if (isset($ns['DAV:'])) {
$dav_ns = $ns['DAV:'] . ':';
}
$regexp = '/<(' . $dav_ns . 'prop(?!find))[^>]*?>(.*?)<\/\1\s*>/s';
if (!preg_match($regexp, $body, $match)) {
return null;
}
// Find all properties
// Allow for empty namespace, see Litmus FAQ for propnullns
// https://github.com/tolsen/litmus/blob/master/FAQ
preg_match_all('!<([\w-]+)[^>]*xmlns="([^"]*)"|<(?:([\w-]+):)?([\w-]+)!', $match[2], $match, PREG_SET_ORDER);
$properties = [];
foreach ($match as $found) {
if (isset($found[4])) {
$url = array_search($found[3], $ns) ?: $default_ns;
$name = $found[4];
}
else {
$url = $found[2];
$name = $found[1];
}
$properties[$url . ':' . $name] = [
'name' => $name,
'ns_alias' => $found[3] ?? null,
'ns_url' => $url,
];
}
return $properties;
}
public function http_propfind(string $uri): ?string
{
// We only support depth of 0 and 1
$depth = isset($_SERVER['HTTP_DEPTH']) && empty($_SERVER['HTTP_DEPTH']) ? 0 : 1;
$uri = $this->_prefix($uri);
$body = file_get_contents('php://input');
if (false !== strpos($body, '<!DOCTYPE ')) {
throw new Exception('Invalid XML', 400);
}
$this->log('Requested depth: %s', $depth);
// We don't really care about having a correct XML string,
// but we can get better WebDAV compliance if we do
if (isset($_SERVER['HTTP_X_LITMUS'])) {
if (false !== strpos($body, '<!DOCTYPE ')) {
throw new Exception('Invalid XML', 400);
}
$xml = @simplexml_load_string($body);
if ($e = libxml_get_last_error()) {
throw new Exception('Invalid XML', 400);
}
}
$requested = $this->extractRequestedProperties($body);
$requested_keys = $requested ? array_keys($requested) : null;
// Find root element properties
$properties = $this->storage->propfind($uri, $requested_keys, $depth);
if (null === $properties) {
throw new Exception('This does not exist', 404);
}
if (isset($properties['DAV::getlastmodified'])) {
foreach (self::MODIFICATION_TIME_PROPERTIES as $name) {
$properties[$name] = $properties['DAV::getlastmodified'];
}
}
$items = [$uri => $properties];
if ($depth) {
foreach ($this->storage->list($uri, $requested) as $file => $properties) {
$path = trim($uri . '/' . $file, '/');
$properties = $properties ?? $this->storage->propfind($path, $requested_keys, 0);
if (!$properties) {
$this->log('!!! Cannot find "%s"', $path);
continue;
}
$items[$path] = $properties;
}
}
// http_response_code doesn't know the 207 status code
header('HTTP/1.1 207 Multi-Status', true);
$this->dav_header();
header('Content-Type: application/xml; charset=utf-8');
$root_namespaces = [
'DAV:' => 'd',
// Microsoft Clients need this special namespace for date and time values (from PEAR/WebDAV)
'urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/' => 'ns0',
];
$i = 0;
$requested ??= [];
foreach ($requested as $prop) {
if ($prop['ns_url'] == 'DAV:' || !$prop['ns_url']) {
continue;
}
if (!array_key_exists($prop['ns_url'], $root_namespaces)) {
$root_namespaces[$prop['ns_url']] = $prop['ns_alias'] ?: 'rns' . $i++;
}
}
foreach ($items as $properties) {
foreach ($properties as $name => $value) {
$pos = strrpos($name, ':');
$ns = substr($name, 0, strrpos($name, ':'));
// NULL namespace, see Litmus FAQ for propnullns
if (!$ns) {
continue;
}
if (!array_key_exists($ns, $root_namespaces)) {
$root_namespaces[$ns] = 'rns' . $i++;
}
}
}
$out = '<?xml version="1.0" encoding="utf-8"?>';
$out .= '<d:multistatus';
foreach ($root_namespaces as $url => $alias) {
$out .= sprintf(' xmlns:%s="%s"', $alias, $url);
}
$out .= '>';
foreach ($items as $uri => $item) {
$e = '<d:response>';
if ($this->prefix) {
$uri = substr($uri, strlen($this->prefix));
}
$uri = trim(rtrim($this->base_uri, '/') . '/' . ltrim($uri, '/'), '/');
$path = '/' . str_replace('%2F', '/', rawurlencode($uri));
if (($item['DAV::resourcetype'] ?? null) == 'collection' && $path != '/') {
$path .= '/';
}
$e .= sprintf('<d:href>%s</d:href>', htmlspecialchars($path, ENT_XML1));
$e .= '<d:propstat><d:prop>';
foreach ($item as $name => $value) {
if (null === $value) {
continue;
}
$pos = strrpos($name, ':');
$ns = substr($name, 0, strrpos($name, ':'));
$tag_name = substr($name, strrpos($name, ':') + 1);
$alias = $root_namespaces[$ns] ?? null;
$attributes = '';
// The ownCloud Android app doesn't like formatted dates, it makes it crash.
// so force it to have a timestamp
if ($name == 'DAV::creationdate'
&& ($value instanceof \DateTimeInterface)
&& false !== stripos($_SERVER['HTTP_USER_AGENT'] ?? '', 'owncloud')) {
$value = $value->getTimestamp();
}
// ownCloud app crashes if mimetype is provided for a directory
// https://github.com/owncloud/android/issues/3768
elseif ($name == 'DAV::getcontenttype'
&& ($item['DAV::resourcetype'] ?? null) == 'collection') {
$value = null;
}
if ($name == 'DAV::resourcetype' && $value == 'collection') {
$value = '<d:collection />';
}
elseif ($name == 'DAV::getetag' && strlen($value) && $value[0] != '"') {
$value = '"' . $value . '"';
}
elseif ($value instanceof \DateTimeInterface) {
// Change value to GMT
$value = clone $value;
$value->setTimezone(new \DateTimeZone('GMT'));
$value = $value->format(DATE_RFC7231);
}
elseif (is_array($value)) {
$attributes = $value['attributes'] ?? '';
$value = $value['xml'] ?? null;
}
else {
$value = htmlspecialchars($value, ENT_XML1);
}
// NULL namespace, see Litmus FAQ for propnullns
if (!$ns) {
$attributes .= ' xmlns=""';
}
else {
$tag_name = $alias . ':' . $tag_name;
}
if (null === $value || self::EMPTY_PROP_VALUE === $value) {
$e .= sprintf('<%s%s />', $tag_name, $attributes ? ' ' . $attributes : '');
}
else {
$e .= sprintf('<%s%s>%s</%1$s>', $tag_name, $attributes ? ' ' . $attributes : '', $value);
}
}
$e .= '</d:prop><d:status>HTTP/1.1 200 OK</d:status></d:propstat>' . "\n";
// Append missing properties
if (!empty($requested)) {
$missing_properties = array_diff($requested_keys, array_keys($item));
if (count($missing_properties)) {
$e .= '<d:propstat><d:prop>';
foreach ($missing_properties as $name) {
$pos = strrpos($name, ':');
$ns = substr($name, 0, strrpos($name, ':'));
$name = substr($name, strrpos($name, ':') + 1);
$alias = $root_namespaces[$ns] ?? null;
// NULL namespace, see Litmus FAQ for propnullns
if (!$alias) {
$e .= sprintf('<%s xmlns="" />', $name);
}
else {
$e .= sprintf('<%s:%s />', $alias, $name);
}
}
$e .= '</d:prop><d:status>HTTP/1.1 404 Not Found</d:status></d:propstat>';
}
}
$e .= '</d:response>' . "\n";
$out .= $e;
}
$out .= '</d:multistatus>';
return $out;
}
static public function parsePropPatch(string $body): array
{
if (false !== strpos($body, '<!DOCTYPE ')) {
throw new Exception('Invalid XML', 400);
}
$xml = @simplexml_load_string($body);
if (false === $xml) {
throw new WebDAV_Exception('Invalid XML', 400);
}
$_ns = null;
// Select correct namespace if required
if (!empty(key($xml->getDocNameSpaces()))) {
$_ns = 'DAV:';
}
$out = [];
// Process set/remove instructions in order (important)
foreach ($xml->children($_ns) as $child) {
foreach ($child->children($_ns) as $prop) {
$prop = $prop->children();
if ($child->getName() == 'set') {
$ns = $prop->getNamespaces(true);
$ns = array_flip($ns);
$name = key($ns) . ':' . $prop->getName();
$attributes = $prop->attributes();
$attributes = $attributes === null ? null : iterator_to_array($attributes);
foreach ($ns as $xmlns => $alias) {
foreach (iterator_to_array($prop->attributes($alias)) as $key => $v) {
$attributes[$xmlns . ':' . $key] = $value;
}
}
if ($prop->count() > 1) {
$text = '';
foreach ($prop->children() as $c) {
$text .= $c->asXML();
}
}
else {
$text = (string)$prop;
}
$out[$name] = ['action' => 'set', 'attributes' => $attributes ?: null, 'content' => $text ?: null];
}
else {
$ns = $prop->getNamespaces();
$name = current($ns) . ':' . $prop->getName();
$out[$name] = ['action' => 'remove'];
}
}
}
return $out;
}
public function http_proppatch(string $uri): ?string
{
$uri = $this->_prefix($uri);
$this->checkLock($uri);
$prefix = '<?xml version="1.0" encoding="utf-8"?>' . "\n";
$prefix.= '<d:multistatus xmlns:d="DAV:"';
$suffix = "</d:multistatus>\n";
$body = file_get_contents('php://input');
$properties = $this->parsePropPatch($body);
$root_namespaces = [];
$i = 0;
$set_time = null;
$set_time_name = null;
foreach ($properties as $name => $value) {
$pos = strrpos($name, ':');
$ns = substr($name, 0, $pos);
if (!array_key_exists($ns, $root_namespaces)) {
$alias = 'rns' . $i++;
$root_namespaces[$ns] = $alias;
$prefix .= sprintf(' xmlns:%s="%s"', $alias, htmlspecialchars($ns, ENT_XML1));
}
}
// See if the client wants to set the modification time
foreach (self::MODIFICATION_TIME_PROPERTIES as $name) {
if (!array_key_exists($name, $properties) || $value['action'] !== 'set' || empty($value['content'])) {
continue;
}
$ts = $value['content'];