<?php
  /**
   * Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   */
  
  OCP\JSON::checkAppEnabled('gallery');
  
  list($token, $img) = explode('/', $_GET['file'], 2);
  $linkItem = \OCP\Share::getShareByToken($token);
  if (is_array($linkItem) && isset($linkItem['uid_owner'])) {
  	// seems to be a valid share
  	$rootLinkItem = \OCP\Share::resolveReShare($linkItem);
  	$owner = $rootLinkItem['uid_owner'];
  	OC_Util::tearDownFS();
  	OC_Util::setupFS($owner);
  	\OC_User::setIncognitoMode(true);
  } else {
  	OCP\JSON::checkLoggedIn();
  
  	list($owner, $img) = explode('/', $_GET['file'], 2);
  	if ($owner !== OCP\User::getUser()) {
  		list(, $img) = explode('/', $img, 2);
  	}
  }
  
  session_write_close();
  
  $ownerView = new \OC\Files\View('/' . $owner . '/files');
  
  if (is_array($linkItem) && isset($linkItem['uid_owner'])) {
  	// prepend path to share
  	$path = $ownerView->getPath($linkItem['file_source']);
  	$img = $path.'/'.$img;
  }
  
  $mime = $ownerView->getMimeType($img);
  list($mimePart,) = explode('/', $mime);
  if ($mimePart === 'image') {
  	$local = $ownerView->getLocalFile($img);
  	$rotate = false;
  	if (is_callable('exif_read_data')) { //don't use OCP\Image here, using OCP\Image will always cause parsing the image file
  		$exif = @exif_read_data($local, 'IFD0');
  		if (isset($exif['Orientation'])) {
  			$rotate = ($exif['Orientation'] > 1);
  		}
  	}
  	if ($rotate) {
  		$image = new OCP\Image($local);
  		$image->fixOrientation();
  		$image->show();
  	} else { //use the original file if we dont need to rotate, saves having to re-encode the image
  		header('Content-Type: ' . $mime);
  		$ownerView->readfile($img);
  	}
  }