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 <?php
 /**
  *  ocs-webserver
  *
  *  Copyright 2016 by pling GmbH.
  *
  *    This file is part of ocs-webserver.
  *
  *    This program is free software: you can redistribute it and/or modify
  *    it under the terms of the GNU Affero General Public License as
  *    published by the Free Software Foundation, either version 3 of the
  *    License, or (at your option) any later version.
  *
  *    This program is distributed in the hope that it will be useful,
  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU Affero General Public License for more details.
  *
  *    You should have received a copy of the GNU Affero General Public License
  *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  **/
 
 ini_set("memory_limit", "80M");
 
 # prevent creation of new directories
 $is_locked = false;
 
 
 # figure out requested path and actual physical file paths
 $orig_dir = dirname(__FILE__);
 $path = $_GET['dir'];
 $tokens = explode("/", $path);
 $file = "/" . implode('/', array_slice($tokens, 4));
 $orig_file = $orig_dir . $file;
 
 
 if (!file_exists($orig_file)) {
     header("Status: 404 Not Found");
     echo "Status: 404 Not Found";
     error_log("PATH={$path} ==> ORIGFILE={$orig_file}");
 
     return 0;
 }
 
 
 # check if new directory would need to be created
 $save_path = "$orig_dir/cache/$tokens[2]$file";
 $save_dir = dirname($save_path);
 
 if (!file_exists($save_dir) && $is_locked) {
     header("Status: 403 Forbidden");
     echo "Status: 403 Forbidden";
     error_log("Directory creation is forbidden. {$save_dir}");
 
     return 0;
 }
 
 # check for a valid image file
 if (!getimagesize($orig_file)) {
     header("Status: 404 Not Found");
     echo "Status: 404 Not Found";
     error_log("PATH={$path} ==> ORIGFILE={$orig_file}");
 
     return 0;
 }
 
 # parse out the requested image dimensions and resize mode
 $x_pos = strpos($tokens[2], 'x');
 $dash_pos = strpos($tokens[2], '-') ? strpos($tokens[2], '-') : strlen($tokens[2]);
 $target_width = substr($tokens[2], 0, $x_pos);
 $target_height = substr($tokens[2], $x_pos + 1, $dash_pos - $x_pos - 1);
 $mode = substr($tokens[2], $dash_pos + 1);
 
 $new_width = $target_width;
 $new_height = $target_height;
 
 try {
     $image = new Imagick($orig_file);
 } catch (ImagickException $e) {
     header("Status: 500 Internal Server Error");
     echo "Status: 500 Internal Server Error";
     error_log($e->getMessage());
 
 }
 list($orig_width, $orig_height, $type, $attr) = getimagesize($orig_file);
 
 # preserve aspect ratio, fitting image to specified box
 if ($mode == "0") {
     $new_height = $orig_height * $new_width / $orig_width;
     if ($new_height > $target_height) {
         $new_width = $orig_width * $target_height / $orig_height;
         $new_height = $target_height;
     }
 } # zoom and crop to exactly fit specified box
 else {
     if ($mode == "2") {
         // crop to get desired aspect ratio
         $desired_aspect = $target_width / $target_height;
         $orig_aspect = $orig_width / $orig_height;
 
         if ($desired_aspect > $orig_aspect) {
             $trim = $orig_height - ($orig_width / $desired_aspect);
             $image->cropImage($orig_width, $orig_height - $trim, 0, $trim / 2);
             error_log("HEIGHT TRIM $trim");
         } else {
             $trim = $orig_width - ($orig_height * $desired_aspect);
             $image->cropImage($orig_width - $trim, $orig_height, $trim / 2, 0);
         }
     }
 }
 
 # mode 3 (stretch to fit) is automatic fall-through as image will be blindly resized
 # in following code to specified box
 //bugfix: $new_width and $new_height have to be > 0
 if ($new_width == 0 && $new_height > 0) {
     $new_width = $new_height;
 }
 if ($new_height == 0 && $new_width > 0) {
     $new_height = $new_width;
 }
 
 $image->resizeImage($new_width, $new_height, imagick::FILTER_LANCZOS, 1);
 
 # save and return the resized image file
 if (!file_exists($save_dir)) {
     mkdir($save_dir, 0777, true);
 }
 
 $image->writeImage($save_path);
 
 
 // Parse Info / Get Extension
 $fsize = filesize($save_path);
 $path_parts = pathinfo($save_path);
 $ext = strtolower($path_parts["extension"]);
 
 // Determine Content Type
 switch ($ext) {
     case "pdf":
         $ctype = "application/pdf";
         break;
     case "exe":
         $ctype = "application/octet-stream";
         break;
     case "zip":
         $ctype = "application/zip";
         break;
     case "doc":
         $ctype = "application/msword";
         break;
     case "xls":
         $ctype = "application/vnd.ms-excel";
         break;
     case "ppt":
         $ctype = "application/vnd.ms-powerpoint";
         break;
     case "gif":
         $ctype = "image/gif";
         break;
     case "png":
         $ctype = "image/png";
         break;
     case "jpeg":
     case "jpg":
         $ctype = "image/jpg";
         break;
     default:
         $ctype = "text/html";
 }
 
 header("Content-Type: $ctype");
 ob_clean();
 flush();
 
 echo file_get_contents($save_path);
 
 return true;