<?php

/*
*  Copyright (c) Codiad & Kent Safranski (codiad.com), distributed
*  as-is and without warranty under the MIT License. See
*  [root]/license.txt for more. This information must remain intact.
*/

require_once('../../lib/diff_match_patch.php');
require_once('../../common.php');

class Filemanager extends Common
{

    //////////////////////////////////////////////////////////////////
    // PROPERTIES
    //////////////////////////////////////////////////////////////////

    public $root          = "";
    public $project       = "";
    public $rel_path      = "";
    public $path          = "";
    public $patch         = "";
    public $type          = "";
    public $new_name      = "";
    public $content       = "";
    public $destination   = "";
    public $upload        = "";
    public $controller    = "";
    public $upload_json   = "";
    public $search_string = "";

    public $search_file_type = "";
    public $query         = "";
    public $foptions     = "";

    // JSEND Return Contents
    public $status        = "";
    public $data          = "";
    public $message       = "";

    //////////////////////////////////////////////////////////////////
    // METHODS
    //////////////////////////////////////////////////////////////////

    // -----------------------------||----------------------------- //

    //////////////////////////////////////////////////////////////////
    // Construct
    //////////////////////////////////////////////////////////////////

    public function __construct($get, $post, $files)
    {
        $this->rel_path = Filemanager::cleanPath($get['path']);

        if ($this->rel_path!="/") {
            $this->rel_path .= "/";
        }
        if (!empty($get['query'])) {
            $this->query = $get['query'];
        }
        if (!empty($get['options'])) {
            $this->foptions = $get['options'];
        }
        $this->root = $get['root'];
        if ($this->isAbsPath($get['path'])) {
            $this->path = Filemanager::cleanPath($get['path']);
        } else {
            $this->root .= '/';
            $this->path = $this->root . Filemanager::cleanPath($get['path']);
        }
        // Search
        if (!empty($post['search_string'])) {
            $this->search_string = ($post['search_string']);
        }
        if (!empty($post['search_file_type'])) {
            $this->search_file_type = ($post['search_file_type']);
        }
        // Create
        if (!empty($get['type'])) {
            $this->type = $get['type'];
        }
        // Modify\Create
        if (!empty($get['new_name'])) {
            $this->new_name = $get['new_name'];
        }

        foreach (array('content', 'mtime', 'patch') as $key) {
            if (!empty($post[$key])) {
                if (get_magic_quotes_gpc()) {
                    $this->$key = stripslashes($post[$key]);
                } else {
                    $this->$key = $post[$key];
                }
            }
        }
        // Duplicate
        if (!empty($get['destination'])) {
            $get['destination'] = Filemanager::cleanPath($get['destination']);
            if ($this->isAbsPath($get['path'])) {
                $this->destination = $get['destination'];
            } else {
                $this->destination = $this->root . $get['destination'];
            }
        }
    }

    //////////////////////////////////////////////////////////////////
    // INDEX (Returns list of files and directories)
    //////////////////////////////////////////////////////////////////

    public function index()
    {

        if (file_exists($this->path)) {
            $index = array();
            if (is_dir($this->path) && $handle = opendir($this->path)) {
                while (false !== ($object = readdir($handle))) {
                    if ($object != "." && $object != ".." && $object != $this->controller) {
                        if (is_dir($this->path.'/'.$object)) {
                            $type = "directory";
                            $size=count(glob($this->path.'/'.$object.'/*'));
                        } else {
                            $type = "file";
                            $size=@filesize($this->path.'/'.$object);
                        }
                        $index[] = array(
                            "name"=>$this->rel_path . $object,
                            "type"=>$type,
                            "size"=>$size
                        );
                    }
                }

                $folders = array();
                $files = array();
                foreach ($index as $item => $data) {
                    if ($data['type']=='directory') {
                        $folders[] = array("name"=>$data['name'],"type"=>$data['type'],"size"=>$data['size']);
                    }
                    if ($data['type']=='file') {
                        $files[] = array("name"=>$data['name'],"type"=>$data['type'],"size"=>$data['size']);
                    }
                }

                function sorter($a, $b, $key = 'name')
                {
                    return strnatcmp($a[$key], $b[$key]);
                }

                usort($folders, "sorter");
                usort($files, "sorter");

                $output = array_merge($folders, $files);

                $this->status = "success";
                $this->data = '"index":' . json_encode($output);
            } else {
                $this->status = "error";
                $this->message = "Not A Directory";
            }
        } else {
            $this->status = "error";
            $this->message = "Path Does Not Exist";
        }

        $this->respond();
    }

    public function find()
    {
        if (!function_exists('shell_exec')) {
            $this->status = "error";
            $this->message = "Shell_exec() Command Not Enabled.";
        } else {
            chdir($this->path);
            $input = str_replace('"', '', $this->query);
            $cmd = 'find -L ';
            $strategy = '';
            if ($this->foptions && $this->foptions['strategy']) {
                $strategy = $this->foptions['strategy'];
            }
            switch ($strategy) {
                case 'substring':
                    $cmd = "$cmd -iname ".escapeshellarg('*'.$input.'*');
                    break;
                case 'regexp':
                    $cmd = "$cmd -regex ".escapeshellarg($input);
                    break;
                case 'left_prefix':
                default:
                    $cmd = "$cmd -iname ".escapeshellarg($input.'*');
                    break;
            }
            $cmd = "$cmd  -printf \"%h/%f %y\n\"";
            $output = shell_exec($cmd);
            $file_arr = explode("\n", $output);
            $output_arr = array();

            error_reporting(0);

            foreach ($file_arr as $i => $fentry) {
                $farr = explode(" ", $fentry);
                $fname = trim($farr[0]);
                if ($farr[1] == 'f') {
                    $ftype = 'file';
                } else {
                    $ftype = 'directory';
                }
                if (strlen($fname) != 0) {
                    $fname = $this->rel_path . substr($fname, 2);
                    $f = array('path' => $fname, 'type' => $ftype );
                    array_push($output_arr, $f);
                }
            }

            if (count($output_arr)==0) {
                $this->status = "error";
                $this->message = "No Results Returned";
            } else {
                $this->status = "success";
                $this->data = '"index":' . json_encode($output_arr);
            }
        }
        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // SEARCH
    //////////////////////////////////////////////////////////////////

    public function search()
    {
        if (!function_exists('shell_exec')) {
            $this->status = "error";
            $this->message = "Shell_exec() Command Not Enabled.";
        } else {
            if ($_GET['type'] == 1) {
                $this->path = WORKSPACE;
            }
            $return = array();

            $input = str_replace('"', '', $this->search_string);
            $cmd = 'find -L ' . escapeshellarg($this->path) . ' -iregex  '.escapeshellarg('.*' . $this->search_file_type ).' -type f | xargs grep -i -I -n -R -H ' . escapeshellarg($input) . '';
            $output = shell_exec($cmd);
            $output_arr = explode("\n", $output);
            foreach ($output_arr as $line) {
                $data = explode(":", $line);
                $da = array();
                if (count($data) > 2) {
                    $da['line'] = $data[1];
                    $da['file'] = str_replace($this->path, '', $data[0]);
                    $da['result'] = str_replace($this->root, '', $data[0]);
                    $da['string'] = str_replace($data[0] . ":" . $data[1] . ':', '', $line);
                    $return[] = $da;
                }
            }
            if (count($return)==0) {
                $this->status = "error";
                $this->message = "No Results Returned";
            } else {
                $this->status = "success";
                $this->data = '"index":' . json_encode($return);
            }
        }
        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // OPEN (Returns the contents of a file)
    //////////////////////////////////////////////////////////////////

    public function open()
    {
        if (is_file($this->path)) {
            $output = file_get_contents($this->path);
            
            if (extension_loaded('mbstring')) {
                if (!mb_check_encoding($output, 'UTF-8')) {
                    if (mb_check_encoding($output, 'ISO-8859-1')) {
                        $output = utf8_encode($output);
                    } else {
                        $output = mb_convert_encoding($content, 'UTF-8');
                    }
                }
            }
        
            $this->status = "success";
            $this->data = '"content":' . json_encode($output);
            $mtime = filemtime($this->path);
            $this->data .= ', "mtime":'.$mtime;
        } else {
            $this->status = "error";
            $this->message = "Not A File :".$this->path;
        }

        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // OPEN IN BROWSER (Return URL)
    //////////////////////////////////////////////////////////////////

    public function openinbrowser()
    {
        $protocol = ((!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
        $domainName = $_SERVER['HTTP_HOST'];
        $url =  $protocol.WSURL.'/'.$this->rel_path;
        $this->status = "success";
        $this->data = '"url":' . json_encode(rtrim($url, "/"));
        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // CREATE (Creates a new file or directory)
    //////////////////////////////////////////////////////////////////

    public function create()
    {

        // Create file
        if ($this->type=="file") {
            if (!file_exists($this->path)) {
                if ($file = fopen($this->path, 'w')) {
                    // Write content
                    if ($this->content) {
                        fwrite($file, $this->content);
                    }
                    $this->data = '"mtime":'.filemtime($this->path);
                    fclose($file);
                    $this->status = "success";
                } else {
                    $this->status = "error";
                    $this->message = "Cannot Create File";
                }
            } else {
                $this->status = "error";
                $this->message = "File Already Exists";
            }
        }

        // Create directory
        if ($this->type=="directory") {
            if (!is_dir($this->path)) {
                mkdir($this->path);
                $this->status = "success";
            } else {
                $this->status = "error";
                $this->message = "Directory Already Exists";
            }
        }

        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // DELETE (Deletes a file or directory (+contents))
    //////////////////////////////////////////////////////////////////

    public function delete()
    {

        function rrmdir($path, $follow)
        {
            if (is_file($path)) {
                unlink($path);
            } else {
                $files = array_diff(scandir($path), array('.','..'));
                foreach ($files as $file) {
                    if (is_link("$path/$file")) {
                        if ($follow) {
                            rrmdir("$path/$file", $follow);
                        }
                        unlink("$path/$file");
                    } elseif (is_dir("$path/$file")) {
                        rrmdir("$path/$file", $follow);
                    } else {
                           unlink("$path/$file");
                    }
                }
                return rmdir($path);
            }
        }

        if (file_exists($this->path)) {
            if (isset($_GET['follow'])) {
                rrmdir($this->path, true);
            } else {
                rrmdir($this->path, false);
            }
            $this->status = "success";
        } else {
            $this->status = "error";
            $this->message = "Path Does Not Exist ";
        }

        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // MODIFY (Modifies a file name/contents or directory name)
    //////////////////////////////////////////////////////////////////

    public function modify()
    {

        // Change name
        if ($this->new_name) {
            $explode = explode('/', $this->path);
            array_pop($explode);
            $new_path = implode("/", $explode) . "/" . $this->new_name;
            if (!file_exists($new_path)) {
                if (rename($this->path, $new_path)) {
                    //unlink($this->path);
                    $this->status = "success";
                } else {
                    $this->status = "error";
                    $this->message = "Could Not Rename";
                }
            } else {
                $this->status = "error";
                $this->message = "Path Already Exists";
            }
        } else {
            // Change content
            if ($this->content || $this->patch) {
                if ($this->content==' ') {
                    $this->content=''; // Blank out file
                }
                if ($this->patch && ! $this->mtime) {
                    $this->status = "error";
                    $this->message = "mtime parameter not found";
                    $this->respond();
                    return;
                }
                if (is_file($this->path)) {
                    $serverMTime = filemtime($this->path);
                    $fileContents = file_get_contents($this->path);
    
                    if ($this->patch && $this->mtime != $serverMTime) {
                        $this->status = "error";
                        $this->message = "Client is out of sync";
                        //DEBUG : file_put_contents($this->path.".conflict", "SERVER MTIME :".$serverMTime.", CLIENT MTIME :".$this->mtime);
                        $this->respond();
                        return;
                    } elseif (strlen(trim($this->patch)) == 0 && ! $this->content) {
                        // Do nothing if the patch is empty and there is no content
                        $this->status = "success";
                        $this->data = '"mtime":'.$serverMTime;
                        $this->respond();
                        return;
                    }
    
                    if ($file = fopen($this->path, 'w')) {
                        if ($this->patch) {
                            $dmp = new diff_match_patch();
                            $p = $dmp->patch_apply($dmp->patch_fromText($this->patch), $fileContents);
                            $this->content = $p[0];
                            //DEBUG : file_put_contents($this->path.".orig",$fileContents );
                            //DEBUG : file_put_contents($this->path.".patch", $this->patch);
                        }
    
                        if (fwrite($file, $this->content) === false) {
                            $this->status = "error";
                            $this->message = "could not write to file";
                        } else {
                            // Unless stat cache is cleared the pre-cached mtime will be
                            // returned instead of new modification time after editing
                            // the file.
                            clearstatcache();
                            $this->data = '"mtime":'.filemtime($this->path);
                            $this->status = "success";
                        }
    
                        fclose($file);
                    } else {
                        $this->status = "error";
                        $this->message = "Cannot Write to File";
                    }
                } else {
                    $this->status = "error";
                    $this->message = "Not A File";
                }
            } else {
                $file = fopen($this->path, 'w');
                fclose($file);
                $this->data = '"mtime":'.filemtime($this->path);
                $this->status = "success";
            }
        }

        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // DUPLICATE (Creates a duplicate of the object - (cut/copy/paste)
    //////////////////////////////////////////////////////////////////

    public function duplicate()
    {

        if (!file_exists($this->path)) {
            $this->status = "error";
            $this->message = "Invalid Source";
        }

        function recurse_copy($src, $dst)
        {
            $dir = opendir($src);
            @mkdir($dst);
            while (false !== ( $file = readdir($dir))) {
                if (( $file != '.' ) && ( $file != '..' )) {
                    if (is_dir($src . '/' . $file)) {
                        recurse_copy($src . '/' . $file, $dst . '/' . $file);
                    } else {
                        copy($src . '/' . $file, $dst . '/' . $file);
                    }
                }
            }
            closedir($dir);
        }

        if ($this->status!="error") {
            if (is_file($this->path)) {
                copy($this->path, $this->destination);
                $this->status = "success";
            } else {
                recurse_copy($this->path, $this->destination);
                if (!$this->response) {
                    $this->status = "success";
                }
            }
        }

        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // UPLOAD (Handles uploads to the specified directory)
    //////////////////////////////////////////////////////////////////

    public function upload()
    {

        // Check that the path is a directory
        if (is_file($this->path)) {
            $this->status = "error";
            $this->message = "Path Not A Directory";
        } else {
            // Handle upload
            $info = array();
            foreach( $_FILES['upload']['name'] as $key=>$value) {
                if (!empty($value)) {
                    $filename = $value;
                    $add = $this->path."/$filename";
                    if (@move_uploaded_file($_FILES['upload']['tmp_name'][$key], $add)) {
                        $info[] = array(
                            "name"=>$value,
                            "size"=>filesize($add),
                            "url"=>$add,
                            "thumbnail_url"=>$add,
                            "delete_url"=>$add,
                            "delete_type"=>"DELETE"
                        );
                    }
                }
            }
            $this->upload_json = json_encode($info);
        }

        $this->respond();
    }

    //////////////////////////////////////////////////////////////////
    // RESPOND (Outputs data in JSON [JSEND] format)
    //////////////////////////////////////////////////////////////////

    public function respond()
    {

        // Success ///////////////////////////////////////////////
        if ($this->status=="success") {
            if ($this->data) {
                $json = '{"status":"success","data":{'.$this->data.'}}';
            } else {
                $json = '{"status":"success","data":null}';
            }

        // Upload JSON ///////////////////////////////////////////
        } elseif ($this->upload_json!='') {
            $json = $this->upload_json;

        // Error /////////////////////////////////////////////////
        } else {
            $json = '{"status":"error","message":"'.$this->message.'"}';
        }

        // Output ////////////////////////////////////////////////
        echo($json);
    }

    //////////////////////////////////////////////////////////////////
    // Clean a path
    //////////////////////////////////////////////////////////////////

    public static function cleanPath($path)
    {
    
        // replace backslash with slash
        $path = str_replace('\\', '/', $path);

        // allow only valid chars in paths$
        $path = preg_replace('/[^A-Za-z0-9\-\._\/\ ]/', '', $path);
        // maybe this is not needed anymore
        // prevent Poison Null Byte injections
        $path = str_replace(chr(0), '', $path);

        // prevent go out of the workspace
        while (strpos($path, '../') !== false) {
            $path = str_replace('../', '', $path);
        }

        return $path;
    }
}