[php] Update elFinderVolumeSFTPphpseclib.class.php (Studio-42#3483)

Currently, this class does not work with symlinks at all.  Permissions also don't work properly.  Using Flysystem is not an option for me because that requires PHP v8.  I ended up creating my own `SFTP3phpseclib.class.php`.  I have edited this file with some of the changes I made to get symlinks sort of working.  I am still testing it so this is just a start.  It took me a long time to figure out how to get symlinks to show up so maybe this will help others struggling with this.  I am using phpseclib v3 so I only tested these changes with that library.

I made a bunch of changes to get permissions working properly.  I may include that in a separate pull request after I test it more.

php/elFinderVolumeSFTPphpseclib.class.php

@@ -247,14 +247,13 @@ protected function parseRaw($raw, $base, $nameOnly = false)
 
         $name = $info['filename'];
 
-        if (preg_match('|(.+)\-\>(.+)|', $name, $m)) {
-            $name = trim($m[1]);
+        if ($info['type'] === 3)) {
             // check recursive processing
             if ($this->cacheDirTarget && $this->_joinPath($base, $name) !== $this->cacheDirTarget) {
                 return array();
             }
             if (!$nameOnly) {
-                $target = trim($m[2]);
+                $target = $this->connect->readlink($name);
                 if (substr($target, 0, 1) !== $this->separator) {
                     $target = $this->getFullPath($target, $base);
                 }
@@ -281,8 +280,19 @@ protected function parseRaw($raw, $base, $nameOnly = false)
         $owner_computed = isset($stat['isowner']) ? $stat['isowner'] : $this->options['owner'];
         $perm = $this->parsePermissions($info['permissions'], $owner_computed);
         $stat['name'] = $name;
-        $stat['mime'] = $info['type'] == NET_SFTP_TYPE_DIRECTORY ? 'directory' : $this->mimetype($stat['name'], true);
-        $stat['size'] = $stat['mime'] == 'directory' ? 0 : $info['size'];
+        if ($info['type'] === NET_SFTP_TYPE_DIRECTORY) {
+            $stat['mime'] = 'directory';
+            $stat['size'] = 0;
+
+        } elseif ($info['type'] === NET_SFTP_TYPE_SYMLINK) {
+            $stat['mime'] = 'symlink';
+            $stat['size'] = 0;
+
+        } else {
+            $stat['mime'] = $this->mimetype($stat['name'], true);
+            $stat['size'] = $info['size'];
+        }
+
         $stat['read'] = $perm['read'];
         $stat['write'] = $perm['write'];
 
@@ -347,6 +357,8 @@ protected function cacheDir($path)
                 if (empty($stat['hidden'])) {
                     if (!$hasDir && $stat['mime'] === 'directory') {
                         $hasDir = true;
+                    } elseif (!$hasDir && $stat['mime'] === 'symlink') {
+                        $hasDir = true;
                     }
                     $this->dirsCache[$path][] = $p;
                 }
@@ -520,6 +532,9 @@ protected function _subdirs($path)
             if ($name && $name !== '.' && $name !== '..' && $info['type'] == NET_SFTP_TYPE_DIRECTORY) {
                 return true;
             }
+            if ($name && $name !== '.' && $name !== '..' && $info['type'] == NET_SFTP_TYPE_SYMLINK) {
+                //return true;
+            }
         }
 
         return false;