nextcloud / server

lib/private/legacy/OC_Files.php

Indentation +372 added lines, -372 removed lines

@@ -51,376 +51,376 @@
  *
  */
 class OC_Files {
-	public const FILE = 1;
-	public const ZIP_FILES = 2;
-	public const ZIP_DIR = 3;
-
-	public const UPLOAD_MIN_LIMIT_BYTES = 1048576; // 1 MiB
-
-
-	private static $multipartBoundary = '';
-
-	/**
-	 * @return string
-	 */
-	private static function getBoundary() {
-		if (empty(self::$multipartBoundary)) {
-			self::$multipartBoundary = md5(mt_rand());
-		}
-		return self::$multipartBoundary;
-	}
-
-	/**
-	 * @param string $filename
-	 * @param string $name
-	 * @param array $rangeArray ('from'=>int,'to'=>int), ...
-	 */
-	private static function sendHeaders($filename, $name, array $rangeArray) {
-		OC_Response::setContentDispositionHeader($name, 'attachment');
-		header('Content-Transfer-Encoding: binary', true);
-		header('Pragma: public');// enable caching in IE
-		header('Expires: 0');
-		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
-		$fileSize = \OC\Files\Filesystem::filesize($filename);
-		$type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
-		if ($fileSize > -1) {
-			if (!empty($rangeArray)) {
-				http_response_code(206);
-				header('Accept-Ranges: bytes', true);
-				if (count($rangeArray) > 1) {
-					$type = 'multipart/byteranges; boundary='.self::getBoundary();
-				// no Content-Length header here
-				} else {
-					header(sprintf('Content-Range: bytes %d-%d/%d', $rangeArray[0]['from'], $rangeArray[0]['to'], $fileSize), true);
-					OC_Response::setContentLengthHeader($rangeArray[0]['to'] - $rangeArray[0]['from'] + 1);
-				}
-			} else {
-				OC_Response::setContentLengthHeader($fileSize);
-			}
-		}
-		header('Content-Type: '.$type, true);
-	}
-
-	/**
-	 * return the content of a file or return a zip file containing multiple files
-	 *
-	 * @param string $dir
-	 * @param string $files ; separated list of files to download
-	 * @param array $params ; 'head' boolean to only send header of the request ; 'range' http range header
-	 */
-	public static function get($dir, $files, $params = null) {
-		$view = \OC\Files\Filesystem::getView();
-		$getType = self::FILE;
-		$filename = $dir;
-		try {
-			if (is_array($files) && count($files) === 1) {
-				$files = $files[0];
-			}
-
-			if (!is_array($files)) {
-				$filename = $dir . '/' . $files;
-				if (!$view->is_dir($filename)) {
-					self::getSingleFile($view, $dir, $files, is_null($params) ? [] : $params);
-					return;
-				}
-			}
-
-			$name = 'download';
-			if (is_array($files)) {
-				$getType = self::ZIP_FILES;
-				$basename = basename($dir);
-				if ($basename) {
-					$name = $basename;
-				}
-
-				$filename = $dir . '/' . $name;
-			} else {
-				$filename = $dir . '/' . $files;
-				$getType = self::ZIP_DIR;
-				// downloading root ?
-				if ($files !== '') {
-					$name = $files;
-				}
-			}
-
-			self::lockFiles($view, $dir, $files);
-
-			/* Calculate filesize and number of files */
-			if ($getType === self::ZIP_FILES) {
-				$fileInfos = [];
-				$fileSize = 0;
-				foreach ($files as $file) {
-					$fileInfo = \OC\Files\Filesystem::getFileInfo($dir . '/' . $file);
-					$fileSize += $fileInfo->getSize();
-					$fileInfos[] = $fileInfo;
-				}
-				$numberOfFiles = self::getNumberOfFiles($fileInfos);
-			} elseif ($getType === self::ZIP_DIR) {
-				$fileInfo = \OC\Files\Filesystem::getFileInfo($dir . '/' . $files);
-				$fileSize = $fileInfo->getSize();
-				$numberOfFiles = self::getNumberOfFiles([$fileInfo]);
-			}
-
-			$streamer = new Streamer(\OC::$server->getRequest(), $fileSize, $numberOfFiles);
-			OC_Util::obEnd();
-
-			$streamer->sendHeaders($name);
-			$executionTime = (int)OC::$server->get(IniGetWrapper::class)->getNumeric('max_execution_time');
-			if (strpos(@ini_get('disable_functions'), 'set_time_limit') === false) {
-				@set_time_limit(0);
-			}
-			ignore_user_abort(true);
-
-			if ($getType === self::ZIP_FILES) {
-				foreach ($files as $file) {
-					$file = $dir . '/' . $file;
-					if (\OC\Files\Filesystem::is_file($file)) {
-						$userFolder = \OC::$server->getRootFolder()->get(\OC\Files\Filesystem::getRoot());
-						$file = $userFolder->get($file);
-						if ($file instanceof \OC\Files\Node\File) {
-							try {
-								$fh = $file->fopen('r');
-							} catch (\OCP\Files\NotPermittedException $e) {
-								continue;
-							}
-							$fileSize = $file->getSize();
-							$fileTime = $file->getMTime();
-						} else {
-							// File is not a file? …
-							\OC::$server->getLogger()->debug(
-								'File given, but no Node available. Name {file}',
-								[ 'app' => 'files', 'file' => $file ]
-							);
-							continue;
-						}
-						$streamer->addFileFromStream($fh, $file->getName(), $fileSize, $fileTime);
-						fclose($fh);
-					} elseif (\OC\Files\Filesystem::is_dir($file)) {
-						$streamer->addDirRecursive($file);
-					}
-				}
-			} elseif ($getType === self::ZIP_DIR) {
-				$file = $dir . '/' . $files;
-				$streamer->addDirRecursive($file);
-			}
-			$streamer->finalize();
-			set_time_limit($executionTime);
-			self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
-		} catch (\OCP\Lock\LockedException $ex) {
-			self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
-			OC::$server->getLogger()->logException($ex);
-			$l = \OC::$server->getL10N('lib');
-			$hint = method_exists($ex, 'getHint') ? $ex->getHint() : '';
-			\OC_Template::printErrorPage($l->t('File is currently busy, please try again later'), $hint, 200);
-		} catch (\OCP\Files\ForbiddenException $ex) {
-			self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
-			OC::$server->getLogger()->logException($ex);
-			$l = \OC::$server->getL10N('lib');
-			\OC_Template::printErrorPage($l->t('Can\'t read file'), $ex->getMessage(), 200);
-		} catch (\Exception $ex) {
-			self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
-			OC::$server->getLogger()->logException($ex);
-			$l = \OC::$server->getL10N('lib');
-			$hint = method_exists($ex, 'getHint') ? $ex->getHint() : '';
-			\OC_Template::printErrorPage($l->t('Can\'t read file'), $hint, 200);
-		}
-	}
-
-	/**
-	 * @param string $rangeHeaderPos
-	 * @param int $fileSize
-	 * @return array $rangeArray ('from'=>int,'to'=>int), ...
-	 */
-	private static function parseHttpRangeHeader($rangeHeaderPos, $fileSize) {
-		$rArray = explode(',', $rangeHeaderPos);
-		$minOffset = 0;
-		$ind = 0;
-
-		$rangeArray = [];
-
-		foreach ($rArray as $value) {
-			$ranges = explode('-', $value);
-			if (is_numeric($ranges[0])) {
-				if ($ranges[0] < $minOffset) { // case: bytes=500-700,601-999
-					$ranges[0] = $minOffset;
-				}
-				if ($ind > 0 && $rangeArray[$ind - 1]['to'] + 1 == $ranges[0]) { // case: bytes=500-600,601-999
-					$ind--;
-					$ranges[0] = $rangeArray[$ind]['from'];
-				}
-			}
-
-			if (is_numeric($ranges[0]) && is_numeric($ranges[1]) && $ranges[0] < $fileSize && $ranges[0] <= $ranges[1]) {
-				// case: x-x
-				if ($ranges[1] >= $fileSize) {
-					$ranges[1] = $fileSize - 1;
-				}
-				$rangeArray[$ind++] = [ 'from' => $ranges[0], 'to' => $ranges[1], 'size' => $fileSize ];
-				$minOffset = $ranges[1] + 1;
-				if ($minOffset >= $fileSize) {
-					break;
-				}
-			} elseif (is_numeric($ranges[0]) && $ranges[0] < $fileSize) {
-				// case: x-
-				$rangeArray[$ind++] = [ 'from' => $ranges[0], 'to' => $fileSize - 1, 'size' => $fileSize ];
-				break;
-			} elseif (is_numeric($ranges[1])) {
-				// case: -x
-				if ($ranges[1] > $fileSize) {
-					$ranges[1] = $fileSize;
-				}
-				$rangeArray[$ind++] = [ 'from' => $fileSize - $ranges[1], 'to' => $fileSize - 1, 'size' => $fileSize ];
-				break;
-			}
-		}
-		return $rangeArray;
-	}
-
-	/**
-	 * @param View $view
-	 * @param string $name
-	 * @param string $dir
-	 * @param array $params ; 'head' boolean to only send header of the request ; 'range' http range header
-	 */
-	private static function getSingleFile($view, $dir, $name, $params) {
-		$filename = $dir . '/' . $name;
-		$file = null;
-
-		try {
-			$userFolder = \OC::$server->getRootFolder()->get(\OC\Files\Filesystem::getRoot());
-			$file = $userFolder->get($filename);
-			if (!$file instanceof \OC\Files\Node\File || !$file->isReadable()) {
-				http_response_code(403);
-				die('403 Forbidden');
-			}
-			$fileSize = $file->getSize();
-		} catch (\OCP\Files\NotPermittedException $e) {
-			http_response_code(403);
-			die('403 Forbidden');
-		} catch (\OCP\Files\InvalidPathException $e) {
-			http_response_code(403);
-			die('403 Forbidden');
-		} catch (\OCP\Files\NotFoundException $e) {
-			http_response_code(404);
-			$tmpl = new OC_Template('', '404', 'guest');
-			$tmpl->printPage();
-			exit();
-		}
-
-		OC_Util::obEnd();
-		$view->lockFile($filename, ILockingProvider::LOCK_SHARED);
-
-		$rangeArray = [];
-
-		if (isset($params['range']) && substr($params['range'], 0, 6) === 'bytes=') {
-			$rangeArray = self::parseHttpRangeHeader(substr($params['range'], 6), $fileSize);
-		}
-
-		self::sendHeaders($filename, $name, $rangeArray);
-
-		if (isset($params['head']) && $params['head']) {
-			return;
-		}
-
-		if (!empty($rangeArray)) {
-			try {
-				if (count($rangeArray) == 1) {
-					$view->readfilePart($filename, $rangeArray[0]['from'], $rangeArray[0]['to']);
-				} else {
-					// check if file is seekable (if not throw UnseekableException)
-					// we have to check it before body contents
-					$view->readfilePart($filename, $rangeArray[0]['size'], $rangeArray[0]['size']);
-
-					$type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
-
-					foreach ($rangeArray as $range) {
-						echo "\r\n--".self::getBoundary()."\r\n".
-						 "Content-type: ".$type."\r\n".
-						 "Content-range: bytes ".$range['from']."-".$range['to']."/".$range['size']."\r\n\r\n";
-						$view->readfilePart($filename, $range['from'], $range['to']);
-					}
-					echo "\r\n--".self::getBoundary()."--\r\n";
-				}
-			} catch (\OCP\Files\UnseekableException $ex) {
-				// file is unseekable
-				header_remove('Accept-Ranges');
-				header_remove('Content-Range');
-				http_response_code(200);
-				self::sendHeaders($filename, $name, []);
-				$view->readfile($filename);
-			}
-		} else {
-			$view->readfile($filename);
-		}
-	}
-
-	/**
-	 * Returns the total (recursive) number of files and folders in the given
-	 * FileInfos.
-	 *
-	 * @param \OCP\Files\FileInfo[] $fileInfos the FileInfos to count
-	 * @return int the total number of files and folders
-	 */
-	private static function getNumberOfFiles($fileInfos) {
-		$numberOfFiles = 0;
-
-		$view = new View();
-
-		while ($fileInfo = array_pop($fileInfos)) {
-			$numberOfFiles++;
-
-			if ($fileInfo->getType() === \OCP\Files\FileInfo::TYPE_FOLDER) {
-				$fileInfos = array_merge($fileInfos, $view->getDirectoryContent($fileInfo->getPath()));
-			}
-		}
-
-		return $numberOfFiles;
-	}
-
-	/**
-	 * @param View $view
-	 * @param string $dir
-	 * @param string[]|string $files
-	 */
-	public static function lockFiles($view, $dir, $files) {
-		if (!is_array($files)) {
-			$file = $dir . '/' . $files;
-			$files = [$file];
-		}
-		foreach ($files as $file) {
-			$file = $dir . '/' . $file;
-			$view->lockFile($file, ILockingProvider::LOCK_SHARED);
-			if ($view->is_dir($file)) {
-				$contents = $view->getDirectoryContent($file);
-				$contents = array_map(function ($fileInfo) use ($file) {
-					/** @var \OCP\Files\FileInfo $fileInfo */
-					return $file . '/' . $fileInfo->getName();
-				}, $contents);
-				self::lockFiles($view, $dir, $contents);
-			}
-		}
-	}
-
-	/**
-	 * @param string $dir
-	 * @param $files
-	 * @param integer $getType
-	 * @param View $view
-	 * @param string $filename
-	 */
-	private static function unlockAllTheFiles($dir, $files, $getType, $view, $filename) {
-		if ($getType === self::FILE) {
-			$view->unlockFile($filename, ILockingProvider::LOCK_SHARED);
-		}
-		if ($getType === self::ZIP_FILES) {
-			foreach ($files as $file) {
-				$file = $dir . '/' . $file;
-				$view->unlockFile($file, ILockingProvider::LOCK_SHARED);
-			}
-		}
-		if ($getType === self::ZIP_DIR) {
-			$file = $dir . '/' . $files;
-			$view->unlockFile($file, ILockingProvider::LOCK_SHARED);
-		}
-	}
+    public const FILE = 1;
+    public const ZIP_FILES = 2;
+    public const ZIP_DIR = 3;
+
+    public const UPLOAD_MIN_LIMIT_BYTES = 1048576; // 1 MiB
+
+
+    private static $multipartBoundary = '';
+
+    /**
+     * @return string
+     */
+    private static function getBoundary() {
+        if (empty(self::$multipartBoundary)) {
+            self::$multipartBoundary = md5(mt_rand());
+        }
+        return self::$multipartBoundary;
+    }
+
+    /**
+     * @param string $filename
+     * @param string $name
+     * @param array $rangeArray ('from'=>int,'to'=>int), ...
+     */
+    private static function sendHeaders($filename, $name, array $rangeArray) {
+        OC_Response::setContentDispositionHeader($name, 'attachment');
+        header('Content-Transfer-Encoding: binary', true);
+        header('Pragma: public');// enable caching in IE
+        header('Expires: 0');
+        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
+        $fileSize = \OC\Files\Filesystem::filesize($filename);
+        $type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
+        if ($fileSize > -1) {
+            if (!empty($rangeArray)) {
+                http_response_code(206);
+                header('Accept-Ranges: bytes', true);
+                if (count($rangeArray) > 1) {
+                    $type = 'multipart/byteranges; boundary='.self::getBoundary();
+                // no Content-Length header here
+                } else {
+                    header(sprintf('Content-Range: bytes %d-%d/%d', $rangeArray[0]['from'], $rangeArray[0]['to'], $fileSize), true);
+                    OC_Response::setContentLengthHeader($rangeArray[0]['to'] - $rangeArray[0]['from'] + 1);
+                }
+            } else {
+                OC_Response::setContentLengthHeader($fileSize);
+            }
+        }
+        header('Content-Type: '.$type, true);
+    }
+
+    /**
+     * return the content of a file or return a zip file containing multiple files
+     *
+     * @param string $dir
+     * @param string $files ; separated list of files to download
+     * @param array $params ; 'head' boolean to only send header of the request ; 'range' http range header
+     */
+    public static function get($dir, $files, $params = null) {
+        $view = \OC\Files\Filesystem::getView();
+        $getType = self::FILE;
+        $filename = $dir;
+        try {
+            if (is_array($files) && count($files) === 1) {
+                $files = $files[0];
+            }
+
+            if (!is_array($files)) {
+                $filename = $dir . '/' . $files;
+                if (!$view->is_dir($filename)) {
+                    self::getSingleFile($view, $dir, $files, is_null($params) ? [] : $params);
+                    return;
+                }
+            }
+
+            $name = 'download';
+            if (is_array($files)) {
+                $getType = self::ZIP_FILES;
+                $basename = basename($dir);
+                if ($basename) {
+                    $name = $basename;
+                }
+
+                $filename = $dir . '/' . $name;
+            } else {
+                $filename = $dir . '/' . $files;
+                $getType = self::ZIP_DIR;
+                // downloading root ?
+                if ($files !== '') {
+                    $name = $files;
+                }
+            }
+
+            self::lockFiles($view, $dir, $files);
+
+            /* Calculate filesize and number of files */
+            if ($getType === self::ZIP_FILES) {
+                $fileInfos = [];
+                $fileSize = 0;
+                foreach ($files as $file) {
+                    $fileInfo = \OC\Files\Filesystem::getFileInfo($dir . '/' . $file);
+                    $fileSize += $fileInfo->getSize();
+                    $fileInfos[] = $fileInfo;
+                }
+                $numberOfFiles = self::getNumberOfFiles($fileInfos);
+            } elseif ($getType === self::ZIP_DIR) {
+                $fileInfo = \OC\Files\Filesystem::getFileInfo($dir . '/' . $files);
+                $fileSize = $fileInfo->getSize();
+                $numberOfFiles = self::getNumberOfFiles([$fileInfo]);
+            }
+
+            $streamer = new Streamer(\OC::$server->getRequest(), $fileSize, $numberOfFiles);
+            OC_Util::obEnd();
+
+            $streamer->sendHeaders($name);
+            $executionTime = (int)OC::$server->get(IniGetWrapper::class)->getNumeric('max_execution_time');
+            if (strpos(@ini_get('disable_functions'), 'set_time_limit') === false) {
+                @set_time_limit(0);
+            }
+            ignore_user_abort(true);
+
+            if ($getType === self::ZIP_FILES) {
+                foreach ($files as $file) {
+                    $file = $dir . '/' . $file;
+                    if (\OC\Files\Filesystem::is_file($file)) {
+                        $userFolder = \OC::$server->getRootFolder()->get(\OC\Files\Filesystem::getRoot());
+                        $file = $userFolder->get($file);
+                        if ($file instanceof \OC\Files\Node\File) {
+                            try {
+                                $fh = $file->fopen('r');
+                            } catch (\OCP\Files\NotPermittedException $e) {
+                                continue;
+                            }
+                            $fileSize = $file->getSize();
+                            $fileTime = $file->getMTime();
+                        } else {
+                            // File is not a file? …
+                            \OC::$server->getLogger()->debug(
+                                'File given, but no Node available. Name {file}',
+                                [ 'app' => 'files', 'file' => $file ]
+                            );
+                            continue;
+                        }
+                        $streamer->addFileFromStream($fh, $file->getName(), $fileSize, $fileTime);
+                        fclose($fh);
+                    } elseif (\OC\Files\Filesystem::is_dir($file)) {
+                        $streamer->addDirRecursive($file);
+                    }
+                }
+            } elseif ($getType === self::ZIP_DIR) {
+                $file = $dir . '/' . $files;
+                $streamer->addDirRecursive($file);
+            }
+            $streamer->finalize();
+            set_time_limit($executionTime);
+            self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
+        } catch (\OCP\Lock\LockedException $ex) {
+            self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
+            OC::$server->getLogger()->logException($ex);
+            $l = \OC::$server->getL10N('lib');
+            $hint = method_exists($ex, 'getHint') ? $ex->getHint() : '';
+            \OC_Template::printErrorPage($l->t('File is currently busy, please try again later'), $hint, 200);
+        } catch (\OCP\Files\ForbiddenException $ex) {
+            self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
+            OC::$server->getLogger()->logException($ex);
+            $l = \OC::$server->getL10N('lib');
+            \OC_Template::printErrorPage($l->t('Can\'t read file'), $ex->getMessage(), 200);
+        } catch (\Exception $ex) {
+            self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
+            OC::$server->getLogger()->logException($ex);
+            $l = \OC::$server->getL10N('lib');
+            $hint = method_exists($ex, 'getHint') ? $ex->getHint() : '';
+            \OC_Template::printErrorPage($l->t('Can\'t read file'), $hint, 200);
+        }
+    }
+
+    /**
+     * @param string $rangeHeaderPos
+     * @param int $fileSize
+     * @return array $rangeArray ('from'=>int,'to'=>int), ...
+     */
+    private static function parseHttpRangeHeader($rangeHeaderPos, $fileSize) {
+        $rArray = explode(',', $rangeHeaderPos);
+        $minOffset = 0;
+        $ind = 0;
+
+        $rangeArray = [];
+
+        foreach ($rArray as $value) {
+            $ranges = explode('-', $value);
+            if (is_numeric($ranges[0])) {
+                if ($ranges[0] < $minOffset) { // case: bytes=500-700,601-999
+                    $ranges[0] = $minOffset;
+                }
+                if ($ind > 0 && $rangeArray[$ind - 1]['to'] + 1 == $ranges[0]) { // case: bytes=500-600,601-999
+                    $ind--;
+                    $ranges[0] = $rangeArray[$ind]['from'];
+                }
+            }
+
+            if (is_numeric($ranges[0]) && is_numeric($ranges[1]) && $ranges[0] < $fileSize && $ranges[0] <= $ranges[1]) {
+                // case: x-x
+                if ($ranges[1] >= $fileSize) {
+                    $ranges[1] = $fileSize - 1;
+                }
+                $rangeArray[$ind++] = [ 'from' => $ranges[0], 'to' => $ranges[1], 'size' => $fileSize ];
+                $minOffset = $ranges[1] + 1;
+                if ($minOffset >= $fileSize) {
+                    break;
+                }
+            } elseif (is_numeric($ranges[0]) && $ranges[0] < $fileSize) {
+                // case: x-
+                $rangeArray[$ind++] = [ 'from' => $ranges[0], 'to' => $fileSize - 1, 'size' => $fileSize ];
+                break;
+            } elseif (is_numeric($ranges[1])) {
+                // case: -x
+                if ($ranges[1] > $fileSize) {
+                    $ranges[1] = $fileSize;
+                }
+                $rangeArray[$ind++] = [ 'from' => $fileSize - $ranges[1], 'to' => $fileSize - 1, 'size' => $fileSize ];
+                break;
+            }
+        }
+        return $rangeArray;
+    }
+
+    /**
+     * @param View $view
+     * @param string $name
+     * @param string $dir
+     * @param array $params ; 'head' boolean to only send header of the request ; 'range' http range header
+     */
+    private static function getSingleFile($view, $dir, $name, $params) {
+        $filename = $dir . '/' . $name;
+        $file = null;
+
+        try {
+            $userFolder = \OC::$server->getRootFolder()->get(\OC\Files\Filesystem::getRoot());
+            $file = $userFolder->get($filename);
+            if (!$file instanceof \OC\Files\Node\File || !$file->isReadable()) {
+                http_response_code(403);
+                die('403 Forbidden');
+            }
+            $fileSize = $file->getSize();
+        } catch (\OCP\Files\NotPermittedException $e) {
+            http_response_code(403);
+            die('403 Forbidden');
+        } catch (\OCP\Files\InvalidPathException $e) {
+            http_response_code(403);
+            die('403 Forbidden');
+        } catch (\OCP\Files\NotFoundException $e) {
+            http_response_code(404);
+            $tmpl = new OC_Template('', '404', 'guest');
+            $tmpl->printPage();
+            exit();
+        }
+
+        OC_Util::obEnd();
+        $view->lockFile($filename, ILockingProvider::LOCK_SHARED);
+
+        $rangeArray = [];
+
+        if (isset($params['range']) && substr($params['range'], 0, 6) === 'bytes=') {
+            $rangeArray = self::parseHttpRangeHeader(substr($params['range'], 6), $fileSize);
+        }
+
+        self::sendHeaders($filename, $name, $rangeArray);
+
+        if (isset($params['head']) && $params['head']) {
+            return;
+        }
+
+        if (!empty($rangeArray)) {
+            try {
+                if (count($rangeArray) == 1) {
+                    $view->readfilePart($filename, $rangeArray[0]['from'], $rangeArray[0]['to']);
+                } else {
+                    // check if file is seekable (if not throw UnseekableException)
+                    // we have to check it before body contents
+                    $view->readfilePart($filename, $rangeArray[0]['size'], $rangeArray[0]['size']);
+
+                    $type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
+
+                    foreach ($rangeArray as $range) {
+                        echo "\r\n--".self::getBoundary()."\r\n".
+                            "Content-type: ".$type."\r\n".
+                            "Content-range: bytes ".$range['from']."-".$range['to']."/".$range['size']."\r\n\r\n";
+                        $view->readfilePart($filename, $range['from'], $range['to']);
+                    }
+                    echo "\r\n--".self::getBoundary()."--\r\n";
+                }
+            } catch (\OCP\Files\UnseekableException $ex) {
+                // file is unseekable
+                header_remove('Accept-Ranges');
+                header_remove('Content-Range');
+                http_response_code(200);
+                self::sendHeaders($filename, $name, []);
+                $view->readfile($filename);
+            }
+        } else {
+            $view->readfile($filename);
+        }
+    }
+
+    /**
+     * Returns the total (recursive) number of files and folders in the given
+     * FileInfos.
+     *
+     * @param \OCP\Files\FileInfo[] $fileInfos the FileInfos to count
+     * @return int the total number of files and folders
+     */
+    private static function getNumberOfFiles($fileInfos) {
+        $numberOfFiles = 0;
+
+        $view = new View();
+
+        while ($fileInfo = array_pop($fileInfos)) {
+            $numberOfFiles++;
+
+            if ($fileInfo->getType() === \OCP\Files\FileInfo::TYPE_FOLDER) {
+                $fileInfos = array_merge($fileInfos, $view->getDirectoryContent($fileInfo->getPath()));
+            }
+        }
+
+        return $numberOfFiles;
+    }
+
+    /**
+     * @param View $view
+     * @param string $dir
+     * @param string[]|string $files
+     */
+    public static function lockFiles($view, $dir, $files) {
+        if (!is_array($files)) {
+            $file = $dir . '/' . $files;
+            $files = [$file];
+        }
+        foreach ($files as $file) {
+            $file = $dir . '/' . $file;
+            $view->lockFile($file, ILockingProvider::LOCK_SHARED);
+            if ($view->is_dir($file)) {
+                $contents = $view->getDirectoryContent($file);
+                $contents = array_map(function ($fileInfo) use ($file) {
+                    /** @var \OCP\Files\FileInfo $fileInfo */
+                    return $file . '/' . $fileInfo->getName();
+                }, $contents);
+                self::lockFiles($view, $dir, $contents);
+            }
+        }
+    }
+
+    /**
+     * @param string $dir
+     * @param $files
+     * @param integer $getType
+     * @param View $view
+     * @param string $filename
+     */
+    private static function unlockAllTheFiles($dir, $files, $getType, $view, $filename) {
+        if ($getType === self::FILE) {
+            $view->unlockFile($filename, ILockingProvider::LOCK_SHARED);
+        }
+        if ($getType === self::ZIP_FILES) {
+            foreach ($files as $file) {
+                $file = $dir . '/' . $file;
+                $view->unlockFile($file, ILockingProvider::LOCK_SHARED);
+            }
+        }
+        if ($getType === self::ZIP_DIR) {
+            $file = $dir . '/' . $files;
+            $view->unlockFile($file, ILockingProvider::LOCK_SHARED);
+        }
+    }
 }